/* ============================================================
   Git Tutorial — Complete Stylesheet
   A professional, colorful, modern CSS for a Git tutorial site
   Author: Dr. Mohammad Arafah
   ============================================================ */

/* ==========================================================
   1. CSS Custom Properties — Theme System
   ========================================================== */

:root,
[data-theme="light"] {
  /* Sygma Brand Palette */
  --brand: #4000A5;
  --brand-2: #00C2FF;
  --brand-3: #2DD4BF;

  /* Primary palette */
  --primary: #4000A5;
  --primary-light: #6E33D6;
  --primary-dark: #1A0550;
  --secondary: #EC4899;
  --secondary-light: #f472b6;
  --accent: #00C2FF;
  --accent-light: #2DD4BF;

  /* Semantic colors */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;

  /* Backgrounds */
  --bg-primary: #f0eaf9;
  --bg-secondary: #e4daf4;
  --bg-tertiary: #d6cce9;
  --bg-card: #ffffff;
  --bg-section-alt: #dce8f8;

  /* Text */
  --text-primary: #1A1A2E;
  --text-secondary: #33284d;
  --text-muted: #5d5480;

  /* Borders */
  --border-color: #c9bfe0;
  --border-strong: #b0a3cc;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(64, 0, 165, 0.10);
  --shadow-md: 0 8px 24px rgba(64, 0, 165, 0.14);
  --shadow-lg: 0 20px 60px rgba(64, 0, 165, 0.20);
  --shadow-xl: 0 20px 25px -5px rgba(64, 0, 165, 0.20);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Typography */
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-code: 'Fira Code', 'Cascadia Code', 'JetBrains Mono', monospace;
  --font-arabic: 'Tajawal', 'Inter', sans-serif;

  /* Gradients — Sygma brand */
  --gradient-primary: linear-gradient(135deg, #4000A5 0%, #00C2FF 100%);
  --gradient-secondary: linear-gradient(135deg, #EC4899 0%, #F43F5E 100%);
  --gradient-success: linear-gradient(135deg, #00C2FF 0%, #2DD4BF 100%);
  --gradient-accent: linear-gradient(135deg, #2DD4BF 0%, #10B981 100%);
  --gradient-warm: linear-gradient(135deg, #F59E0B 0%, #F43F5E 100%);
  --gradient-hero: linear-gradient(135deg, #4000A5 0%, #00C2FF 50%, #2DD4BF 100%);
}

/* ----------------------------------------------------------
   Dark Theme
   ---------------------------------------------------------- */
[data-theme="dark"] {
  --primary: #8B5CF6;
  --primary-light: #A78BFA;
  --primary-dark: #6D28D9;
  --bg-primary: #0a0514;
  --bg-secondary: #150a2b;
  --bg-tertiary: #0f0720;
  --bg-card: #150a2b;
  --text-primary: #ECE9F7;
  --text-secondary: #b2a9d1;
  --text-muted: #8478a8;
  --border-color: #2b1a4a;
  --border-strong: #3c2766;
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.55);
}

/* ==========================================================
   2. Global Reset & Base Styles
   ========================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  transition: background 0.3s cubic-bezier(0.4,0,0.2,1), color 0.3s cubic-bezier(0.4,0,0.2,1);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[dir="rtl"] body {
  font-family: var(--font-arabic);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul,
ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
  color: inherit;
}

input,
select,
textarea {
  font-family: inherit;
  color: inherit;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* Container */
.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 20px;
  width: 100%;
}

/* Section shared */
section {
  padding: 100px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
}

.section-title h2 {
  font-weight: 800;
  margin-bottom: 15px;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin-inline: auto;
}

/* ==========================================================
   3. Loading Spinner
   ========================================================== */

.loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-spinner {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary);
  border-right-color: var(--secondary);
  animation: spin 0.8s linear infinite;
}

/* ==========================================================
   4. Progress Indicator
   ========================================================== */

.progress-indicator {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: var(--gradient-primary);
  z-index: 9999;
  transition: width 0.25s ease-out;
  border-radius: 0 2px 2px 0;
}

/* ==========================================================
   5. Navbar
   ========================================================== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 0 clamp(16px, 3vw, 40px);
  background: rgba(10, 5, 20, 0.55);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(139, 92, 246, 0.08);
  transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(10, 5, 20, 0.72);
}

.navbar.scrolled {
  background: rgba(228, 218, 244, 0.92);
  border-bottom-color: rgba(139, 92, 246, 0.12);
  box-shadow: 0 1px 0 rgba(139, 92, 246, 0.06), 0 4px 20px -8px rgba(64, 0, 165, 0.12);
}
[data-theme="dark"] .navbar.scrolled {
  background: rgba(10, 5, 20, 0.88);
  border-bottom-color: rgba(139, 92, 246, 0.15);
  box-shadow: 0 1px 0 rgba(139, 92, 246, 0.1), 0 4px 20px -8px rgba(0, 0, 0, 0.4);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

/* Nav Brand */
.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  text-decoration: none;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-brand i,
.nav-brand .brand-icon {
  font-size: 1.5rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 8px rgba(139, 92, 246, 0.3));
}

.nav-brand span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(15, 7, 32, 0.45);
  padding: 4px 5px;
  border-radius: 999px;
  border: 1px solid rgba(139, 92, 246, 0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar.scrolled .nav-links {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

[data-theme="dark"] .navbar.scrolled .nav-links {
  background: rgba(15, 7, 32, 0.5);
  border-color: rgba(139, 92, 246, 0.15);
}

.nav-links a {
  position: relative;
  padding: 8px 16px;
  color: rgba(255, 255, 255, 0.65);
  font-weight: 600;
  font-size: 0.82rem;
  border-radius: 999px;
  border: 1px solid rgba(139, 92, 246, 0.3);
  transition: color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  text-decoration: none;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.navbar.scrolled .nav-links a {
  color: var(--text-muted);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 70%;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: transform 0.3s ease;
  transform-origin: center;
}

.nav-links a:hover {
  color: #ffffff;
  background: rgba(139, 92, 246, 0.15);
}

.navbar.scrolled .nav-links a:hover {
  color: var(--primary);
  background: rgba(64, 0, 165, 0.08);
}

[data-theme="dark"] .navbar.scrolled .nav-links a:hover {
  color: #ffffff;
  background: rgba(139, 92, 246, 0.15);
}

.nav-links a:hover::after {
  transform: translateX(-50%) scaleX(0);
}

.nav-links a.active,
.navbar.scrolled .nav-links a.active {
  color: #ffffff;
  background: #6d28d9;
  font-weight: 700;
  border-color: #6d28d9;
  box-shadow: 0 2px 12px rgba(109, 40, 217, 0.5);
}

.nav-links a.active::after {
  transform: translateX(-50%) scaleX(0);
}

/* Nav Controls */
.nav-controls,
.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

#mobile-theme-toggle,
#mobile-lang-toggle {
  display: none;
}

/* OS Select */
#os-select {
  padding: 7px 30px 7px 12px;
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 10px;
  background-color: rgba(15, 7, 32, 0.4);
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238478a8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: all 0.25s ease;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar.scrolled #os-select {
  background-color: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

[data-theme="dark"] .navbar.scrolled #os-select {
  background-color: rgba(15, 7, 32, 0.5);
  border-color: rgba(139, 92, 246, 0.2);
  color: rgba(255, 255, 255, 0.8);
}

[dir="rtl"] #os-select {
  padding: 8px 14px 8px 32px;
  background-position: left 10px center;
}

#os-select:hover {
  border-color: var(--primary);
}

#os-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(64, 0, 165, 0.15);
}

/* Theme Toggle */
#theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 7, 32, 0.4);
  border: 1px solid rgba(139, 92, 246, 0.2);
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar.scrolled #theme-toggle {
  background: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

[data-theme="dark"] .navbar.scrolled #theme-toggle {
  background: rgba(15, 7, 32, 0.5);
  border-color: rgba(139, 92, 246, 0.2);
  color: rgba(255, 255, 255, 0.7);
}

#theme-toggle:hover {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  transform: translateY(-2px);
  box-shadow: 0 6px 14px -4px rgba(64, 0, 165, 0.35);
}

#theme-toggle:active {
  transform: scale(0.92);
}

/* Language Toggle */
#lang-toggle {
  padding: 7px 16px;
  border-radius: 10px;
  border: 1px solid rgba(139, 92, 246, 0.2);
  background: rgba(15, 7, 32, 0.4);
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.navbar.scrolled #lang-toggle {
  background: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

[data-theme="dark"] .navbar.scrolled #lang-toggle {
  background: rgba(15, 7, 32, 0.5);
  border-color: rgba(139, 92, 246, 0.2);
  color: rgba(255, 255, 255, 0.8);
}

#lang-toggle:hover {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  transform: translateY(-2px);
  box-shadow: 0 6px 14px -4px rgba(64, 0, 165, 0.35);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 5px;
  z-index: 1010;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.navbar.scrolled .hamburger span {
  background: var(--text-primary);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ==========================================================
   6. Hero Section
   ========================================================== */

/* Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  position: relative;
  background: #050210;
  overflow: hidden;
  padding: 120px 20px 80px;
}

/* Animated dot grid background */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(139,92,246,0.15) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: heroGridDrift 20s linear infinite;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 30%, transparent 100%);
}

@keyframes heroGridDrift {
  0% { transform: translate(0, 0); }
  100% { transform: translate(40px, 40px); }
}

/* Animated glow orbs */
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  opacity: 0.4;
}

.hero-glow-1 {
  width: 500px;
  height: 500px;
  background: #8B5CF6;
  top: -10%;
  left: 10%;
  animation: heroGlow1 8s ease-in-out infinite;
}

.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: #00C2FF;
  bottom: -5%;
  right: 10%;
  animation: heroGlow2 10s ease-in-out infinite;
}

.hero-glow-3 {
  width: 300px;
  height: 300px;
  background: #2DD4BF;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation: heroGlow3 12s ease-in-out infinite;
  opacity: 0.2;
}

@keyframes heroGlow1 {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.35; }
  50% { transform: translate(30px, 20px) scale(1.15); opacity: 0.5; }
}

@keyframes heroGlow2 {
  0%, 100% { transform: translate(0, 0) scale(1); opacity: 0.3; }
  50% { transform: translate(-25px, -15px) scale(1.1); opacity: 0.45; }
}

@keyframes heroGlow3 {
  0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.15; }
  50% { transform: translate(-50%, -50%) scale(1.3); opacity: 0.3; }
}

/* Hero Content */
.hero-content {
  text-align: center;
  color: #ffffff;
  position: relative;
  z-index: 2;
  max-width: 900px;
  margin-inline: auto;
}

/* Animated badge */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: 50px;
  background: rgba(139,92,246,0.15);
  border: 1px solid rgba(139,92,246,0.3);
  color: #a78bfa;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 30px;
  animation: heroFadeUp 0.8s ease both;
  backdrop-filter: blur(8px);
}

.hero-badge i {
  font-size: 0.9rem;
  animation: heroBadgeSpin 4s linear infinite;
}

@keyframes heroBadgeSpin {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(15deg); }
  75% { transform: rotate(-15deg); }
}

/* Gradient animated title */
.hero-title-gradient {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 0%, #a78bfa 30%, #00C2FF 60%, #2DD4BF 100%);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: heroTitleShimmer 6s ease infinite, heroFadeUp 0.8s ease 0.1s both;
}

@keyframes heroTitleShimmer {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-content .hero-subtitle {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.15rem;
  margin-bottom: 0;
  max-width: 550px;
  margin-inline: auto;
  line-height: 1.7;
  animation: heroFadeUp 0.8s ease 0.2s both;
}

.hero-subtitle .typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 1.15em;
  background: rgba(139,92,246,0.9);
  margin-inline-start: 2px;
  vertical-align: text-bottom;
  animation: heroSubtitleCursor 0.7s step-end infinite;
}

.hero-subtitle .typewriter-cursor.hidden {
  opacity: 0;
  animation: none;
}

@keyframes heroSubtitleCursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Hero Buttons */
.hero-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 36px;
  animation: heroFadeUp 0.8s ease 0.3s both;
}

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
  color: #ffffff;
  background: linear-gradient(135deg, #8B5CF6 0%, #6D28D9 100%);
  box-shadow: 0 0 20px rgba(139,92,246,0.3), 0 4px 15px rgba(0,0,0,0.3);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  position: relative;
  overflow: hidden;
}

.btn-hero-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255,255,255,0.15) 50%, transparent 100%);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.btn-hero-primary:hover::before {
  transform: translateX(100%);
}

.btn-hero-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 35px rgba(139,92,246,0.5), 0 8px 25px rgba(0,0,0,0.3);
  color: #ffffff;
}

.hero-btn-arrow {
  font-size: 0.85rem;
  transition: transform 0.3s ease;
}

.btn-hero-primary:hover .hero-btn-arrow {
  transform: translateX(4px);
}

[dir="rtl"] .btn-hero-primary:hover .hero-btn-arrow {
  transform: translateX(-4px) scaleX(-1);
}

[dir="rtl"] .hero-btn-arrow {
  transform: scaleX(-1);
}

.btn-hero-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(12px);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

.btn-hero-secondary:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(139,92,246,0.4);
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

/* Hero Stats */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 50px;
  animation: heroFadeUp 0.8s ease 0.5s both;
}

.hero-stats .stat-card {
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 24px 14px 20px;
  text-align: center;
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
  background: rgba(255,255,255,0.03);
  position: relative;
  overflow: hidden;
}

.hero-stats .stat-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.4s ease;
}

.hero-stats .stat-card:nth-child(1)::before { background: linear-gradient(135deg, rgba(139,92,246,0.2), rgba(64,0,165,0.1)); }
.hero-stats .stat-card:nth-child(2)::before { background: linear-gradient(135deg, rgba(0,194,255,0.2), rgba(6,182,212,0.1)); }
.hero-stats .stat-card:nth-child(3)::before { background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(234,88,12,0.1)); }
.hero-stats .stat-card:nth-child(4)::before { background: linear-gradient(135deg, rgba(16,185,129,0.2), rgba(5,150,105,0.1)); }

.hero-stats .stat-card:hover::before { opacity: 1; }

.hero-stats .stat-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255,255,255,0.2);
}

.hero-stats .stat-card:nth-child(1):hover { box-shadow: 0 12px 30px rgba(139,92,246,0.2); border-color: rgba(139,92,246,0.35); }
.hero-stats .stat-card:nth-child(2):hover { box-shadow: 0 12px 30px rgba(0,194,255,0.2); border-color: rgba(0,194,255,0.35); }
.hero-stats .stat-card:nth-child(3):hover { box-shadow: 0 12px 30px rgba(245,158,11,0.2); border-color: rgba(245,158,11,0.35); }
.hero-stats .stat-card:nth-child(4):hover { box-shadow: 0 12px 30px rgba(16,185,129,0.2); border-color: rgba(16,185,129,0.35); }

.stat-icon {
  font-size: 1.3rem;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.hero-stats .stat-card:nth-child(1) .stat-icon { color: #a78bfa; }
.hero-stats .stat-card:nth-child(2) .stat-icon { color: #22d3ee; }
.hero-stats .stat-card:nth-child(3) .stat-icon { color: #fbbf24; }
.hero-stats .stat-card:nth-child(4) .stat-icon { color: #34d399; }

.stat-card .stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: #ffffff;
  display: block;
  line-height: 1.2;
  position: relative;
  z-index: 1;
}

.hero-stats .stat-card:nth-child(1) .stat-number { color: #a78bfa; }
.hero-stats .stat-card:nth-child(2) .stat-number { color: #22d3ee; }
.hero-stats .stat-card:nth-child(3) .stat-number { color: #fbbf24; }
.hero-stats .stat-card:nth-child(4) .stat-number { color: #34d399; }

.stat-card .stat-label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
  margin-top: 6px;
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  position: relative;
  z-index: 1;
}

/* Hero fade-up entrance animation */
@keyframes heroFadeUp {
  from { opacity: 0; transform: translateY(25px); }
  to { opacity: 1; transform: translateY(0); }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  text-decoration: none;
  line-height: 1.4;
  white-space: nowrap;
}

.btn i {
  font-size: 1rem;
}

.btn-primary {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  color: #ffffff;
  box-shadow: 0 8px 20px -8px rgba(64, 0, 165, 0.5);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(64, 0, 165, 0.5);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 2px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.7);
  transform: translateY(-2px);
  color: #ffffff;
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 18px 40px;
  font-size: 1.1rem;
}

.btn-outline {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: transparent;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 14px -4px rgba(64, 0, 165, 0.35);
}

.btn-success {
  background: var(--gradient-accent);
  color: #ffffff;
}

.btn-danger {
  background: var(--gradient-secondary);
  color: #ffffff;
}

/* Hero Terminal */
.hero-terminal {
  width: 700px;
  max-width: 100%;
  margin: 40px auto 0;
}

.hero-terminal .terminal-body {
  min-height: 280px;
  max-height: 280px;
}

/* ==========================================================
   7. Terminal Component
   ========================================================== */

.terminal {
  background: #0a0514;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(139, 92, 246, 0.25);
  box-shadow: 0 0 30px rgba(64, 0, 165, 0.2), var(--shadow-xl);
  overflow: hidden;
  width: 100%;
}

.terminal-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  background: #150a2b;
  border-bottom: 1px solid #2b1a4a;
  direction: ltr;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  position: relative;
}

.btn-clear-term {
  margin-inline-start: auto;
  background: transparent;
  border: 1px solid rgba(139, 92, 246, 0.2);
  color: rgba(255, 255, 255, 0.4);
  width: 28px;
  height: 28px;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  transition: all 0.2s;
}
.btn-clear-term:hover {
  color: rgba(255, 255, 255, 0.8);
  border-color: rgba(139, 92, 246, 0.4);
  background: rgba(139, 92, 246, 0.1);
}

.terminal-dots {
  display: flex;
  gap: 8px;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red {
  background: #F43F5E;
}

.dot.yellow {
  background: #F59E0B;
}

.dot.green {
  background: #2DD4BF;
}

.terminal-title {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
  font-family: var(--font-code);
  user-select: none;
}

.terminal-body {
  padding: 20px;
  font-family: var(--font-code);
  font-size: 14px;
  color: #b2a9d1;
  max-height: 400px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #2b1a4a transparent;
  direction: ltr;
  text-align: left;
}

.terminal-body::-webkit-scrollbar {
  width: 6px;
}

.terminal-body::-webkit-scrollbar-track {
  background: transparent;
}

.terminal-body::-webkit-scrollbar-thumb {
  background: #2b1a4a;
  border-radius: 3px;
}

.terminal-line {
  margin-bottom: 8px;
  line-height: 1.6;
}

.terminal-prompt {
  color: #00C2FF;
}

.terminal-prompt::before {
  content: "$ ";
  color: #2DD4BF;
  font-weight: 600;
}

.terminal-command {
  color: #e2e8f0;
}

.terminal-output {
  color: #2DD4BF;
  padding-left: 0;
}

[dir="rtl"] .terminal-output {
  padding-left: 0;
  padding-right: 0;
}

.terminal-error {
  color: #F43F5E;
}

.terminal-info {
  color: #F59E0B;
}

.terminal-warning {
  color: #F59E0B;
}

.terminal-comment {
  color: #8478a8;
  font-style: italic;
}

/* Terminal large variant for playground */
.terminal-large {
  min-height: 450px;
}

.terminal-large .terminal-body {
  max-height: 600px;
  min-height: 400px;
}

/* Terminal input line */
.terminal-input-line {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px 14px;
  direction: ltr;
  border-top: 1px solid rgba(139, 92, 246, 0.1);
}

.terminal-input-line .prompt-symbol {
  color: #2DD4BF;
  font-family: var(--font-code);
}

.terminal-input-line input {
  background: transparent;
  border: none;
  color: #e2e8f0;
  font-family: var(--font-code);
  font-size: 14px;
  outline: none;
  flex: 1;
  caret-color: #2DD4BF;
}

.terminal-input-line input::placeholder {
  color: rgba(139, 92, 246, 0.35);
}

.terminal-cursor {
  display: inline-block;
  width: 8px;
  height: 18px;
  background: #00C2FF;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

/* ==========================================================
   8. Features Section
   ========================================================== */

.features-section {
  background: var(--bg-secondary);
  padding: 100px 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-card);
  padding: 40px 30px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent), var(--accent-light));
  transform: scaleX(0);
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
  transform-origin: left;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 24px;
  color: #ffffff;
  background: var(--gradient-primary);
  box-shadow: 0 4px 15px rgba(64, 0, 165, 0.3);
}

.feature-card:nth-child(2) .feature-icon {
  background: var(--gradient-accent);
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.feature-card:nth-child(3) .feature-icon {
  background: var(--gradient-secondary);
  box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
}

.feature-card:nth-child(4) .feature-icon {
  background: var(--gradient-success);
  box-shadow: 0 4px 15px rgba(79, 172, 254, 0.3);
}

.feature-card:nth-child(5) .feature-icon {
  background: var(--gradient-warm);
  box-shadow: 0 4px 15px rgba(250, 112, 154, 0.3);
}

.feature-card:nth-child(6) .feature-icon {
  background: var(--gradient-accent);
  box-shadow: 0 4px 15px rgba(67, 233, 123, 0.3);
}

.feature-card h3 {
  margin-top: 20px;
  margin-bottom: 12px;
  font-size: 1.2rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ==========================================================
   9. Learning Path Section
   ========================================================== */

.learning-section {
  padding: 100px 0;
}

/* Path Filter */
.path-filter {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.path-filter .filter-btn {
  padding: 10px 24px;
  border-radius: 50px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

.path-filter .filter-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(64, 0, 165, 0.05);
}

.path-filter .filter-btn.active {
  background: var(--gradient-primary);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(64, 0, 165, 0.3);
}

/* Module Grid — now a block container for level sections */
.module-grid {
  display: block;
}

/* Module Card */
.module-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  box-shadow: var(--shadow-sm);
  position: relative;
  display: flex;
  flex-direction: column;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  border-radius: 16px 0 0 16px;
  background: var(--card-gradient, var(--gradient-primary));
}

[dir="rtl"] .module-card::before {
  left: auto;
  right: 0;
  border-radius: 0 16px 16px 0;
}

.module-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.module-card-header {
  padding: 18px 20px 0;
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
}

.module-card-title {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.35;
  flex: 1;
  min-width: 0;
}

.module-card-title i {
  margin-right: 8px;
  font-size: 1.15rem;
}

.module-number {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: #fff;
  flex-shrink: 0;
}

.module-card-header .module-icon-wrap {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  min-width: 0;
}

.module-badge {
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.module-card-body {
  padding: 10px 20px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.module-card-body .module-desc,
.module-card-body p {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-bottom: 0;
  line-height: 1.6;
  flex: 1;
}

.module-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.module-tags .tag {
  padding: 3px 10px;
  border-radius: 50px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
}

.module-card-footer {
  padding: 12px 20px 16px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.module-footer-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.meta-pill i {
  font-size: 0.7rem;
  color: var(--primary-light);
}

.module-progress {
  flex: 1;
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
}

.module-progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 3px;
  transition: width 0.5s ease;
}

.module-card-footer .btn {
  padding: 8px 20px;
  font-size: 0.85rem;
}

/* Card states */
.module-card.completed {
  border-color: var(--success);
  box-shadow: 0 0 0 1px rgba(16, 185, 129, 0.15), 0 0 15px rgba(16, 185, 129, 0.08);
}

.module-card.locked {
  opacity: 0.6;
  filter: grayscale(0.4);
  pointer-events: none;
}

.module-card.locked .module-card-footer .btn {
  cursor: not-allowed;
}

/* ==========================================================
   10. Module View / Steps
   ========================================================== */

.module-section {
  padding: 100px 0;
}

.module-header {
  position: sticky;
  top: 70px;
  background: var(--bg-primary);
  z-index: 50;
  padding: 15px 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(10px);
}

.module-header .back-btn,
.module-header .btn-back {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-weight: 500;
  cursor: pointer;
  transition: color 0.3s ease;
}

.module-header .back-btn:hover,
.module-header .btn-back:hover {
  color: var(--primary);
}

.module-header .progress-text {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Step Cards */
/* Step Timeline */
.steps-timeline {
  position: relative;
  padding-left: 60px;
}
.steps-timeline::before {
  content: '';
  position: absolute;
  left: 17px;
  top: 36px;
  bottom: 40px;
  width: 3px;
  background: rgba(139, 92, 246, 0.3);
  border-radius: 2px;
}
[dir="rtl"] .steps-timeline {
  padding-left: 0;
  padding-right: 60px;
}
[dir="rtl"] .steps-timeline::before {
  left: auto;
  right: 17px;
}

.step-timeline-item {
  position: relative;
  padding-bottom: 8px;
}

.step-timeline-node {
  position: absolute;
  left: -60px;
  top: 24px;
  width: 36px;
  height: 36px;
  z-index: 2;
}
[dir="rtl"] .step-timeline-node {
  left: auto;
  right: -60px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  color: rgba(139, 92, 246, 0.8);
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
  border: 2px solid rgba(139, 92, 246, 0.5);
  transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
  position: relative;
}
.step-number-done {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}
.step-number-done i { font-size: 0.8rem; }
.step-number-current {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 0 18px rgba(139, 92, 246, 0.45);
  animation: pulse-node 2.5s ease-in-out infinite;
}
@keyframes pulse-node {
  0%, 100% { box-shadow: 0 0 14px rgba(139, 92, 246, 0.35); }
  50% { box-shadow: 0 0 24px rgba(139, 92, 246, 0.55); }
}

.step-timeline-connector { display: none; }

.steps-timeline .step-completed::after {
  content: '';
  position: absolute;
  left: -44px;
  top: 60px;
  bottom: -4px;
  width: 3px;
  background: var(--success);
  border-radius: 2px;
  z-index: 1;
}
[dir="rtl"] .steps-timeline .step-completed::after {
  left: auto;
  right: -44px;
}
.step-timeline-item:last-child::after {
  display: none !important;
}

/* Step Card */
.step-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  overflow: hidden;
  position: relative;
}
.step-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: transparent;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  transition: background 0.3s ease;
}
[dir="rtl"] .step-card::before {
  left: auto;
  right: 0;
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}

.step-card:hover {
  border-color: rgba(139, 92, 246, 0.25);
  transform: translateX(4px);
}
[dir="rtl"] .step-card:hover {
  transform: translateX(-4px);
}
.step-card:hover::before {
  background: var(--gradient-primary);
}

.step-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 24px;
  border-bottom: 1px solid rgba(139, 92, 246, 0.06);
}

.step-header-text {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-width: 0;
}

.step-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 3px;
  font-weight: 500;
}

.step-title {
  font-size: 1.08rem;
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.step-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  flex-shrink: 0;
  white-space: nowrap;
}
.step-badge-concept {
  background: rgba(59, 130, 246, 0.1);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.15);
}
.step-badge-concept i { color: #60a5fa; font-size: 0.6rem; }
.step-badge-handson {
  background: rgba(16, 185, 129, 0.1);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.15);
}
.step-badge-handson i { color: #34d399; font-size: 0.6rem; }

.step-body {
  padding: 16px 24px 18px;
}

.step-description {
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.7;
  font-size: 0.9rem;
}

.step-cmd-section {
  background: rgba(139, 92, 246, 0.03);
  border: 1px solid rgba(139, 92, 246, 0.08);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 0;
}

.step-callouts {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}

.step-footer {
  padding: 12px 24px;
  background: rgba(139, 92, 246, 0.02);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.step-footer-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}
.step-footer-label i {
  font-size: 0.65rem;
  opacity: 0.6;
}

.step-completed .step-card {
  border-color: rgba(16, 185, 129, 0.15);
}
.step-completed .step-card::before {
  background: var(--success);
}
.step-completed .step-body { opacity: 0.65; }
.step-completed .step-card:hover {
  transform: none;
}

/* OS Tabs */
.os-tabs {
  display: flex;
  gap: 5px;
  margin: 15px 0;
  flex-wrap: wrap;
}
[dir="rtl"] .os-tabs {
  justify-content: flex-end;
}

.os-tab {
  padding: 6px 16px;
  border-radius: 50px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid transparent;
  transition: all 0.3s ease;
}

.os-tab:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.os-tab.active {
  background: var(--primary);
  color: #ffffff;
}

/* Step Command */
.step-command {
  position: relative;
  background: #1e1136;
  border: 1px solid #2b1a4a;
  border-radius: var(--radius-sm);
  padding: 15px 20px;
  padding-right: 50px;
  font-family: var(--font-code);
  font-size: 0.9rem;
  color: #e2dff0;
  margin: 10px 0;
  overflow-x: auto;
  white-space: pre;
  line-height: 1.6;
  direction: ltr;
  text-align: left;
}

[dir="rtl"] .step-command {
  padding-right: 50px;
  padding-left: 20px;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: rgba(139, 92, 246, 0.15);
  color: #a78bfa;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transition: all 0.3s ease;
  font-size: 0.85rem;
}

[dir="rtl"] .copy-btn {
  right: auto;
  left: 8px;
}

.step-command:hover .copy-btn {
  opacity: 1;
}

.copy-btn:hover {
  background: rgba(139, 92, 246, 0.25);
  color: #c4b5fd;
}

[data-theme="dark"] .copy-btn:hover {
  background: rgba(0, 194, 255, 0.15);
  color: var(--accent);
}

.copy-btn.copied {
  color: var(--accent-light);
}

/* Step Output */
.step-output {
  background: #140d26;
  direction: ltr;
  text-align: left;
  border-radius: var(--radius-sm);
  padding: 15px 20px;
  font-family: var(--font-code);
  font-size: 0.85rem;
  color: #b2a9d1;
  margin: 10px 0;
  border-left: 3px solid var(--success);
  max-height: 200px;
  overflow-y: auto;
  transition: max-height 0.3s ease;
}

[dir="rtl"] .step-output {
  border-left: none;
  border-right: 3px solid var(--success);
}
[dir="rtl"] .step-output-label {
  direction: rtl;
  justify-content: flex-end;
}

.step-output.collapsed {
  max-height: 60px;
  cursor: pointer;
}

.step-output-toggle {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--primary);
  font-size: 0.8rem;
  cursor: pointer;
  margin-top: 5px;
  font-weight: 500;
}

/* Step callout base */
.step-vscode,
.step-tip,
.step-warning {
  border-radius: 8px;
  padding: 10px 14px;
  margin: 0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.84rem;
  line-height: 1.55;
}

/* Step VSCode hint */
.step-vscode {
  background: rgba(0, 122, 204, 0.05);
  border: 1px solid rgba(0, 122, 204, 0.12);
}

[dir="rtl"] .step-vscode {
  border: 1px solid rgba(0, 122, 204, 0.12);
}

.step-vscode i,
.step-vscode .vscode-icon {
  color: #007acc;
  font-size: 0.9rem;
  margin-top: 2px;
  flex-shrink: 0;
}

.step-vscode strong {
  color: #007acc;
}

/* Step Tip */
.step-tip {
  background: rgba(245, 158, 11, 0.05);
  border: 1px solid rgba(245, 158, 11, 0.12);
}

[dir="rtl"] .step-tip {
  border: 1px solid rgba(245, 158, 11, 0.12);
}

.step-tip i,
.step-tip .tip-icon {
  color: var(--warning);
  font-size: 0.9rem;
  margin-top: 2px;
  flex-shrink: 0;
}

/* Step Warning */
.step-warning {
  background: rgba(239, 68, 68, 0.05);
  border: 1px solid rgba(239, 68, 68, 0.12);
}

[dir="rtl"] .step-warning {
  border: 1px solid rgba(239, 68, 68, 0.12);
}

.step-warning i,
.step-warning .warning-icon {
  color: var(--danger);
  font-size: 1.1rem;
  margin-top: 2px;
  flex-shrink: 0;
}

/* ==========================================================
   11. Terminal Playground Section
   ========================================================== */

.terminal-section {
  background: var(--bg-secondary);
  padding: 100px 0;
}

.playground-container {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.playground-container .terminal {
  flex: 5;
  min-width: 0;
}

.terminal-sidebar {
  flex: 2;
  min-width: 0;
}

/* --- Terminal Tab Bar --- */
.terminal-tab-bar { display: flex; align-items: center; gap: 2px; margin-left: 12px; }
.term-tab {
  padding: 5px 16px; border: none; background: rgba(64,0,165,0.06); color: var(--text-muted);
  font-size: 0.8rem; font-family: var(--font-code); cursor: pointer;
  border-radius: 6px 6px 0 0; transition: all 0.2s;
}
.term-tab.active { background: rgba(64,0,165,0.12); color: var(--text-primary); }
.term-tab-add {
  padding: 2px 10px; border: none; background: transparent; color: var(--text-muted);
  font-size: 1rem; cursor: pointer; border-radius: 4px; transition: all 0.2s;
}
.term-tab-add:hover { color: var(--success); background: rgba(64,0,165,0.06); }

/* --- Git State Panel (left) --- */
.term-state-panel {
  flex: 2.5; min-width: 0; display: flex; flex-direction: column; gap: 8px;
  background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 10px;
  padding: 14px;
}
.state-section { padding: 8px 0; border-bottom: 1px solid var(--border-color); }
.state-section:last-child { border-bottom: none; }
.state-heading {
  font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.4px;
  color: var(--text-muted); margin-bottom: 8px; font-weight: 700;
}
.state-heading i { margin-right: 5px; }
.state-value { font-family: var(--font-code); font-size: 0.82rem; color: var(--accent); }

/* File Explorer */
.file-tree { font-family: var(--font-code); font-size: 0.8rem; }
.file-tree-empty { color: var(--text-muted); font-style: italic; font-size: 0.8rem; }
.ft-item {
  display: flex; align-items: center; gap: 6px; padding: 3px 4px;
  border-radius: 4px; transition: background 0.15s;
}
.ft-item:hover { background: rgba(64,0,165,0.06); }
.ft-item i { font-size: 0.7rem; width: 14px; text-align: center; }
.ft-name { color: var(--text-secondary); }
.ft-badge {
  font-size: 0.7rem; padding: 2px 6px; border-radius: 3px; margin-left: auto;
  font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px;
}
.ft-staged { color: var(--success); }
.ft-staged .ft-badge { background: rgba(16,185,129,0.15); color: var(--success); }
.ft-modified { color: var(--warning); }
.ft-modified .ft-badge { background: rgba(245,158,11,0.15); color: var(--warning); }
.ft-untracked { color: var(--danger); }
.ft-untracked .ft-badge { background: rgba(239,68,68,0.15); color: var(--danger); }
.ft-committed { color: var(--text-muted); }

/* Commit mini graph */
.commit-mini-graph { font-family: var(--font-code); font-size: 0.8rem; max-height: 120px; overflow-y: auto; }
.cm-item { display: flex; align-items: center; gap: 6px; padding: 2px 0; }
.cm-hash { color: var(--accent); font-weight: 600; }
.cm-msg { color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cm-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); flex-shrink: 0; }
.cm-line { width: 1px; height: 10px; background: var(--border-color); margin-left: 3.5px; }
.cm-empty { color: var(--text-muted); font-style: italic; }

/* Achievements */
.achievements-list { display: flex; flex-wrap: wrap; gap: 6px; }
.ach-badge {
  display: flex; align-items: center; gap: 4px; padding: 5px 10px;
  border-radius: 20px; font-size: 0.75rem; font-weight: 600;
  transition: all 0.3s;
}
.ach-badge.locked { background: rgba(64,0,165,0.04); color: var(--text-muted); }
.ach-badge.unlocked {
  background: linear-gradient(135deg, rgba(64,0,165,0.2), rgba(0,194,255,0.2));
  color: var(--accent); border: 1px solid rgba(0,194,255,0.3);
  animation: achUnlock 0.5s ease;
}
@keyframes achUnlock {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); opacity: 1; }
}

/* --- Challenge Bar --- */
.term-challenge-bar {
  background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 10px;
  padding: 14px 20px; margin-bottom: 16px;
}
.challenge-selector { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.challenge-tabs-row { flex-basis: 100%; margin-top: 2px; }
.challenge-label { color: var(--warning); font-weight: 700; font-size: 0.88rem; white-space: nowrap; }
.challenge-level-tabs { display: flex; gap: 4px; }
.ch-level-btn {
  padding: 5px 12px; border: 1px solid var(--border-color); border-radius: 16px;
  background: transparent; color: var(--text-muted); font-size: 0.75rem; cursor: pointer;
  transition: all 0.2s; font-weight: 600; white-space: nowrap;
}
.ch-level-btn:hover { border-color: var(--accent); color: var(--accent); }
.ch-level-btn.active { background: rgba(0,194,255,0.12); border-color: var(--accent); color: var(--accent); }
.ch-level-btn[data-level="beginner"].active { background: rgba(16,185,129,0.12); border-color: var(--success); color: var(--success); }
.ch-level-btn[data-level="intermediate"].active { background: rgba(245,158,11,0.12); border-color: var(--warning); color: var(--warning); }
.ch-level-btn[data-level="advanced"].active { background: rgba(239,68,68,0.12); border-color: #ef4444; color: #ef4444; }
.challenge-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.challenge-tab-btn {
  padding: 6px 14px; border: 1px solid var(--border-color); border-radius: 20px;
  background: transparent; color: var(--text-muted); font-size: 0.8rem; cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1); font-weight: 500; position: relative;
}
.challenge-tab-btn .ch-level-dot {
  display: inline-block; width: 6px; height: 6px; border-radius: 50%; margin-right: 5px; vertical-align: middle;
}
.challenge-tab-btn .ch-level-dot.beginner { background: var(--success); }
.challenge-tab-btn .ch-level-dot.intermediate { background: var(--warning); }
.challenge-tab-btn .ch-level-dot.advanced { background: #ef4444; }
.challenge-tab-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.challenge-tab-btn.active { background: rgba(0,194,255,0.12); border-color: var(--accent); color: var(--accent); }
.challenge-tab-btn.completed { border-color: var(--success); color: var(--success); background: rgba(16,185,129,0.08); }
.ch-reset-btn {
  width: 100%; padding: 6px 12px; border: 1px solid var(--border-color); border-radius: 8px;
  background: transparent; color: var(--text-muted); font-size: 0.75rem; cursor: pointer;
  transition: all 0.2s; font-weight: 600; margin-top: 10px;
}
.ch-reset-btn:hover { border-color: #ef4444; color: #ef4444; background: rgba(239,68,68,0.08); }

/* --- Guide Panel (replaces sidebar) --- */
.sidebar-guide { display: flex; flex-direction: column; gap: 12px; }
.guide-header { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.guide-title { font-size: 0.92rem; font-weight: 700; color: var(--accent); margin: 0; }
.guide-close-btn {
  background: transparent; border: 1px solid var(--border-color); color: var(--text-muted);
  width: 28px; height: 28px; border-radius: 6px; cursor: pointer; display: flex; align-items: center;
  justify-content: center; transition: all 0.2s; font-size: 0.75rem;
}
.guide-close-btn:hover { border-color: #ef4444; color: #ef4444; background: rgba(239,68,68,0.08); }
.guide-desc { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; margin: 0; }
.guide-progress-bar {
  height: 6px; background: rgba(255,255,255,0.08); border-radius: 3px; overflow: hidden;
}
.guide-progress-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 3px; transition: width 0.4s cubic-bezier(0.4,0,0.2,1); width: 0%;
}
.guide-progress-text { font-size: 0.72rem; color: var(--text-muted); text-align: center; }
.guide-steps { display: flex; flex-direction: column; gap: 6px; overflow-y: auto; max-height: 340px; padding-right: 4px; }
.guide-step {
  display: flex; align-items: flex-start; gap: 10px; padding: 10px 12px;
  border-radius: 8px; border: 1px solid transparent; background: rgba(255,255,255,0.02);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1); position: relative;
}
.guide-step-num {
  width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 700; flex-shrink: 0; border: 2px solid var(--border-color);
  color: var(--text-muted); background: transparent; transition: all 0.3s;
}
.guide-step-content { flex: 1; min-width: 0; }
.guide-step-label { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); line-height: 1.4; }
.guide-step-hint {
  font-size: 0.72rem; font-family: var(--font-code); color: var(--text-muted);
  margin-top: 4px; padding: 4px 8px; background: rgba(0,0,0,0.2); border-radius: 4px;
  display: none; opacity: 0; transition: opacity 0.2s;
}
.guide-step.current { border-color: rgba(0,194,255,0.3); background: rgba(0,194,255,0.06); }
.guide-step.current .guide-step-num { border-color: var(--accent); color: var(--accent); background: rgba(0,194,255,0.1); }
.guide-step.current .guide-step-label { color: var(--accent); }
.guide-step.current .guide-step-hint { display: block; opacity: 1; }
.guide-step.done { background: rgba(16,185,129,0.04); }
.guide-step.done .guide-step-num { border-color: var(--success); color: #fff; background: var(--success); }
.guide-step.done .guide-step-label { color: var(--success); text-decoration: line-through; text-decoration-color: rgba(16,185,129,0.4); }
.guide-step.pending { opacity: 0.5; }

.guide-complete-msg {
  display: none; flex-direction: column; align-items: center; gap: 10px; padding: 20px;
  text-align: center; color: var(--success); animation: guideComplete 0.6s ease;
}
.guide-complete-msg i { font-size: 2.2rem; }
.guide-complete-msg span { font-weight: 700; font-size: 0.95rem; }
.guide-next-btn {
  margin-top: 6px; padding: 8px 18px; background: linear-gradient(135deg, var(--accent), var(--primary));
  color: #fff; border: none; border-radius: 20px; cursor: pointer; font-weight: 600; font-size: 0.8rem;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}
.guide-next-btn:hover { transform: translateY(-2px); box-shadow: 0 4px 15px rgba(0,194,255,0.3); }

@keyframes guideComplete {
  0% { transform: scale(0.8); opacity: 0; }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes stepComplete {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* RTL overrides for guide panel */
[dir="rtl"] .guide-step-hint { direction: ltr; text-align: left; }
[dir="rtl"] .challenge-tab-btn .ch-level-dot { margin-right: 0; margin-left: 5px; }

/* --- Command Breakdown Tooltips --- */
.cmd-breakdown {
  min-height: 0; overflow: hidden; transition: min-height 0.25s ease;
  padding: 0 15px; font-family: var(--font-code); font-size: 0.78rem;
  background: rgba(0,194,255,0.04);
}
.cmd-breakdown.active { min-height: 32px; padding: 8px 15px; border-top: 1px solid var(--border-color); }
.cbd-parts { display: flex; gap: 4px; flex-wrap: wrap; align-items: center; }
.cbd-part {
  position: relative; padding: 2px 6px; border-radius: 4px; cursor: help;
  transition: background 0.15s;
}
.cbd-part:hover { background: rgba(64,0,165,0.08); }
.cbd-base { color: var(--primary); }
.cbd-sub { color: var(--primary-light); }
.cbd-flag { color: var(--warning); }
.cbd-arg { color: var(--success); }
.cbd-file { color: var(--accent); }
.cbd-tooltip {
  position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%);
  background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 6px;
  padding: 6px 10px; font-size: 0.7rem; color: var(--text-secondary); white-space: nowrap;
  pointer-events: none; opacity: 0; transition: opacity 0.15s;
  z-index: 10; box-shadow: var(--shadow-md);
}
.cbd-part:hover .cbd-tooltip { opacity: 1; }

/* --- Mistake Coach (enhanced) --- */
.mistake-coach {
  background: rgba(245,158,11,0.06); border: 1px solid rgba(245,158,11,0.2);
  border-radius: 8px; padding: 10px 14px; margin: 4px 0;
}
.mc-header { color: var(--warning); font-weight: 700; font-size: 0.8rem; margin-bottom: 6px; }
.mc-compare { display: flex; gap: 12px; margin: 6px 0; font-family: var(--font-code); font-size: 0.78rem; }
.mc-wrong { color: var(--danger); text-decoration: line-through; opacity: 0.6; }
.mc-right { color: var(--success); }
.mc-fix-btn {
  padding: 3px 10px; border: 1px solid var(--success); border-radius: 4px;
  background: rgba(16,185,129,0.1); color: var(--success); font-size: 0.7rem;
  cursor: pointer; transition: all 0.2s; margin-top: 4px;
}
.mc-fix-btn:hover { background: rgba(16,185,129,0.2); }

/* --- Command Timeline (vertical) --- */
.sidebar-timeline {
  display: flex; flex-direction: column; gap: 0;
  max-height: 180px; overflow-y: auto; position: relative;
  scrollbar-width: thin; scrollbar-color: var(--border-color) transparent;
  padding-left: 12px;
}
.tl-empty {
  color: var(--text-muted); font-size: 0.75rem; font-style: italic; padding-left: 0;
}
.tl-step {
  display: flex; align-items: center; gap: 10px; padding: 5px 0;
  position: relative; cursor: pointer; transition: all 0.15s;
}
.tl-step::before {
  content: ''; position: absolute; left: -9px; top: 18px;
  width: 1px; height: calc(100% - 8px);
  background: rgba(139, 92, 246, 0.2);
}
.tl-step:last-child::before { display: none; }
.tl-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
  background: rgba(139, 92, 246, 0.3); border: 1.5px solid rgba(139, 92, 246, 0.5);
  position: relative; left: -13px; z-index: 1;
}
.tl-step-latest .tl-dot {
  background: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 6px rgba(0, 194, 255, 0.4);
}
.tl-cmd {
  font-family: var(--font-code); font-size: 0.75rem; color: var(--text-muted);
  margin-left: -6px;
}
.tl-step:hover .tl-cmd { color: var(--accent); }
.tl-step-latest .tl-cmd { color: var(--accent); font-weight: 600; }
.term-bottom-actions { display: flex; gap: 6px; flex-shrink: 0; }
.btn-export, .btn-clear-all {
  padding: 6px 14px; border: 1px solid var(--border-color); border-radius: 6px;
  background: transparent; color: var(--text-muted); font-size: 0.8rem; cursor: pointer;
  transition: all 0.2s; display: flex; align-items: center; gap: 4px;
}
.btn-export:hover { border-color: var(--accent); color: var(--accent); }
.btn-clear-all:hover { border-color: var(--danger); color: var(--danger); }

.terminal-sidebar h3 {
  margin-bottom: 15px;
  font-size: 1rem;
}

.quick-commands {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.quick-command-btn {
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-code);
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  text-align: left;
  transition: all 0.3s ease;
}

[dir="rtl"] .quick-command-btn {
  text-align: right;
}

.quick-command-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(64, 0, 165, 0.05);
}

.quick-command-btn code {
  color: var(--primary);
  font-weight: 600;
}

/* ==========================================================
   12. Git Visualizer Section
   ========================================================== */

.visualizer-section {
  padding: 100px 0;
  background: linear-gradient(180deg, #0f0720 0%, #150a2b 50%, #0f0720 100%);
}

.visualizer-container {
  background: #0f0720;
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(139,92,246,0.15);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

.visualizer-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.visualizer-controls .btn {
  padding: 8px 18px;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.visualizer-controls .btn:nth-child(1) {
  background: var(--gradient-primary);
  color: #ffffff;
}

.visualizer-controls .btn:nth-child(2) {
  background: var(--gradient-accent);
  color: #ffffff;
}

.visualizer-controls .btn:nth-child(3) {
  background: var(--gradient-success);
  color: #ffffff;
}

.visualizer-controls .btn:nth-child(4) {
  background: var(--gradient-secondary);
  color: #ffffff;
}

.visualizer-controls .btn:nth-child(5) {
  background: var(--gradient-warm);
  color: #ffffff;
}

#git-canvas {
  width: 100%;
  min-height: 400px;
  background: #0a0514;
  border-radius: var(--radius-md);
  display: block;
}

.visualizer-info {
  padding: 20px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-md);
  margin-top: 20px;
  color: rgba(255,255,255,0.75);
  font-size: 0.95rem;
  line-height: 1.7;
  border: 1px solid rgba(139,92,246,0.1);
}

/* ==========================================================
   13. Cheat Sheet Section
   ========================================================== */

.cheatsheet-section {
  background: var(--bg-secondary);
  padding: 100px 0;
}

/* Cheat Search */
.cheat-search {
  position: relative;
  max-width: 600px;
  margin: 0 auto 40px;
}

.cheat-search input {
  width: 100%;
  padding: 15px 25px 15px 50px;
  border-radius: 50px;
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  font-size: 1rem;
  color: var(--text-primary);
  transition: all 0.3s ease;
  outline: none;
}

[dir="rtl"] .cheat-search input {
  padding: 15px 50px 15px 25px;
}

.cheat-search input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(64, 0, 165, 0.1);
}

.cheat-search input::placeholder {
  color: var(--text-muted);
}

.cheat-search .search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
}

[dir="rtl"] .cheat-search .search-icon {
  left: auto;
  right: 20px;
}

/* Cheat Grid */
.cheat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(350px, 100%), 1fr));
  gap: 20px;
}

/* Cheat Card */
.cheat-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  box-shadow: var(--shadow-sm);
}

.cheat-card:hover {
  transform: translateY(-5px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
}

.cheat-category {
  padding: 15px 20px;
  color: #ffffff;
  font-weight: 700;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.cheat-category.setup {
  background: var(--gradient-primary);
}

.cheat-category.basics {
  background: var(--gradient-accent);
}

.cheat-category.branching {
  background: var(--gradient-success);
}

.cheat-category.remote {
  background: var(--gradient-secondary);
}

.cheat-category.advanced {
  background: var(--gradient-warm);
}

.cheat-category.stash {
  background: linear-gradient(135deg, #6E33D6 0%, #4000A5 100%);
}

.cheat-items {
  padding: 20px;
}

.cheat-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px dashed var(--border-color);
  gap: 4px 6px;
}

.cheat-item:last-child {
  border-bottom: none;
}

.cheat-command {
  font-family: var(--font-code);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.85rem;
  direction: ltr;
  text-align: left;
  white-space: nowrap;
}

.cheat-copy-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 2px 4px;
  font-size: 0.7rem;
  flex-shrink: 0;
  transition: all 0.2s ease;
  opacity: 0.4;
}

.cheat-item:hover .cheat-copy-btn {
  opacity: 1;
}

.cheat-copy-btn:hover {
  color: var(--primary);
}

.cheat-copy-btn.copied {
  color: #10b981;
  opacity: 1;
}

.cheat-desc {
  color: var(--text-secondary);
  font-size: 0.82rem;
  text-align: left;
  word-wrap: break-word;
  flex: 0 0 100%;
  line-height: 1.5;
}

/* ==========================================================
   14. Quiz Section
   ========================================================== */

.quiz-section {
  background: var(--bg-secondary);
  padding: 100px 0;
}

/* Quiz Controls */
.quiz-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 15px;
}

.quiz-level-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.quiz-level-btns .level-btn {
  padding: 8px 20px;
  border-radius: 50px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.85rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
}

.quiz-level-btns .level-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.quiz-level-btns .level-btn.active {
  background: var(--gradient-primary);
  color: #ffffff;
}

.quiz-score {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--primary);
}

.quiz-score i {
  font-size: 1.3rem;
}

/* Quiz Card */
.quiz-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  box-shadow: var(--shadow-sm);
}

.quiz-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.quiz-question {
  font-size: 1.1rem;
  margin-bottom: 20px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.quiz-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option {
  padding: 15px 20px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
}

.quiz-option:hover {
  border-color: var(--primary);
  background: rgba(64, 0, 165, 0.04);
}

.quiz-option.selected {
  border-color: var(--primary);
  background: rgba(64, 0, 165, 0.06);
}

.quiz-option.correct {
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.08);
}

.quiz-option.correct::after {
  content: '\2713';
  margin-inline-start: auto;
  color: var(--success);
  font-weight: 700;
  font-size: 1.2rem;
}

.quiz-option.incorrect {
  border-color: var(--danger);
  background: rgba(239, 68, 68, 0.08);
}

.quiz-option.incorrect::after {
  content: '\2717';
  margin-inline-start: auto;
  color: var(--danger);
  font-weight: 700;
  font-size: 1.2rem;
}

.quiz-option .option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.quiz-option:hover .option-letter {
  background: var(--primary);
  color: #ffffff;
}

/* Quiz Explanation */
.quiz-explanation {
  display: none;
  background: var(--bg-tertiary);
  padding: 15px 20px;
  border-radius: var(--radius-md);
  margin-top: 15px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  animation: slideDown 0.3s ease;
}

.quiz-explanation.show {
  display: block;
}

/* Quiz Result */
.quiz-result {
  text-align: center;
  padding: 40px 20px;
}

.quiz-result .result-score {
  font-size: 4rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: pulse 1.5s ease-in-out infinite;
}

.quiz-result .result-label {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: 10px;
}

/* ==========================================================
   15. Workflows Section
   ========================================================== */

.workflows-section {
  padding: 100px 0;
  background: linear-gradient(180deg, #0f0720 0%, #150a2b 50%, #0f0720 100%);
}

.workflow-tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.workflow-tabs .tab-btn {
  padding: 10px 24px;
  border-radius: 50px;
  background: rgba(255,255,255,0.08);
  color: rgba(255,255,255,0.7);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid rgba(255,255,255,0.1);
  transition: all 0.3s ease;
}

.workflow-tabs .tab-btn:hover {
  color: #ffffff;
  border-color: var(--primary);
  background: rgba(139,92,246,0.15);
}

.workflow-tabs .tab-btn.active {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(64, 0, 165, 0.3);
}

.workflow-content {
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid rgba(139,92,246,0.15);
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

.workflow-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #ffffff;
}

.workflow-svg {
  width: 100%;
  height: auto;
  background: #1a1030;
  border-radius: var(--radius-md);
  padding: 20px 10px;
  margin-bottom: 20px;
  border: 1px solid rgba(139,92,246,0.15);
  direction: ltr;
}

.workflow-desc {
  color: rgba(255,255,255,0.7);
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 700px;
}

.workflow-diagram {
  text-align: center;
  margin-bottom: 30px;
}

.workflow-diagram svg {
  max-width: 100%;
  height: auto;
}

.workflow-description {
  max-width: 700px;
  margin: 0 auto 30px;
  text-align: center;
  color: rgba(255,255,255,0.7);
  font-size: 1.05rem;
  line-height: 1.7;
}

.workflow-steps {
  max-width: 700px;
  margin-inline: auto;
  counter-reset: workflow-step;
}

.workflow-steps li {
  counter-increment: workflow-step;
  padding: 15px 15px 15px 55px;
  position: relative;
  margin-bottom: 10px;
  border-radius: var(--radius-sm);
  transition: background 0.3s ease;
}

[dir="rtl"] .workflow-steps li {
  padding: 15px 55px 15px 15px;
}

.workflow-steps li {
  color: rgba(255,255,255,0.8);
}

.workflow-steps li:hover {
  background: rgba(255,255,255,0.05);
}

.workflow-steps li::before {
  content: counter(workflow-step);
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

[dir="rtl"] .workflow-steps li::before {
  left: auto;
  right: 10px;
}

/* ==========================================================
   16. Footer
   ========================================================== */

.footer {
  background: #0a0514;
  color: #ECE9F7;
  padding: 80px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand .footer-logo {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-brand .footer-logo span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-brand p {
  color: #b2a9d1;
  font-size: 0.95rem;
  line-height: 1.7;
}

.footer h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #ECE9F7;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #b2a9d1;
  font-size: 0.9rem;
  transition: color 0.3s ease, padding-inline-start 0.3s ease;
  text-decoration: none;
}

.footer-links a:hover {
  color: #ffffff;
  padding-inline-start: 8px;
}

.footer-author p {
  color: #b2a9d1;
  font-size: 0.9rem;
  line-height: 1.7;
}

.footer-author a {
  color: var(--primary-light);
}

.footer-author a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #2b1a4a;
  text-align: center;
  padding: 20px 0 0;
  color: #8478a8;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--primary-light);
}

/* ==========================================================
   17. Floating Elements
   ========================================================== */

/* Scroll to Top */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background: var(--gradient-primary);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: 0 4px 15px rgba(64, 0, 165, 0.4);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
  z-index: 500;
  border: none;
}

[dir="rtl"] .scroll-top {
  right: auto;
  left: 30px;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-top:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(64, 0, 165, 0.5);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.modal-overlay.active {
  display: flex;
}

.modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  padding: 30px;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.3s ease;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-header h3 {
  font-size: 1.2rem;
}

.modal-close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.modal-close:hover {
  background: var(--danger);
  color: #ffffff;
}

#command-modal {
  z-index: 2000;
}

/* ==========================================================
   18. Keyframe Animations
   ========================================================== */

@keyframes gradient-shift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes blink {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

@keyframes typing {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(64, 0, 165, 0.15);
  }
  50% {
    box-shadow: 0 0 40px rgba(64, 0, 165, 0.35);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Animation utility classes */
.fade-in {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ==========================================================
   19. Responsive Design
   ========================================================== */

/* Tablets & small desktops */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .level-modules-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .playground-container {
    flex-direction: column;
  }

  .playground-container .terminal {
    flex: 1;
    width: 100%;
  }

  .term-state-panel {
    flex-direction: row;
    flex-wrap: wrap;
    max-height: none;
  }
  .term-state-panel .state-section {
    flex: 1;
    min-width: 140px;
    border-bottom: none;
    border-right: 1px solid var(--border-color);
  }

  .terminal-sidebar {
    flex: 1;
    width: 100%;
  }

  .terminal-toolbar { flex-direction: column; gap: 8px; }
  .cmd-timeline { width: 100%; }
  .challenge-level-tabs { flex-wrap: wrap; }
  .challenge-tabs { overflow-x: auto; flex-wrap: nowrap; }
  .guide-steps { max-height: 240px; }

  .quick-commands {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .quick-command-btn {
    flex: 1 1 auto;
  }

  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Tablets */
@media (max-width: 768px) {
  section {
    padding: 60px 0;
  }

  /* Navbar mobile */
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    box-shadow: var(--shadow-lg);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    z-index: 999;
    gap: 5px;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
  }

  .nav-links a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
  }

  .nav-links a::after {
    display: none;
  }

  .nav-right {
    display: flex !important;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
  }

  .nav-right #os-select,
  .nav-right #theme-toggle,
  .nav-right #lang-toggle {
    display: none !important;
  }

  #mobile-theme-toggle,
  #mobile-lang-toggle {
    display: flex !important;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: rgba(139, 92, 246, 0.2);
    border: 1.5px solid rgba(139, 92, 246, 0.45);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
  }

  #mobile-lang-toggle {
    font-size: 0.82rem;
    font-family: 'Tajawal', sans-serif;
    width: auto;
    padding: 0 12px;
  }

  #mobile-theme-toggle:active,
  #mobile-lang-toggle:active {
    background: rgba(139, 92, 246, 0.35);
    border-color: #8B5CF6;
  }

  /* Hero mobile */
  .hero-section {
    padding: 90px 16px 50px;
    min-height: auto;
    flex-direction: column;
  }

  .hero-title-gradient {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  .hero-content .hero-subtitle {
    font-size: 0.92rem;
    padding: 0 8px;
  }

  .hero-badge {
    font-size: 0.72rem;
    padding: 5px 14px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-top: 32px;
  }

  .hero-stats .stat-card {
    padding: 16px 10px 14px;
  }

  .stat-card .stat-number {
    font-size: 1.5rem;
  }

  .stat-card .stat-label {
    font-size: 0.68rem;
  }

  .stat-icon {
    font-size: 1rem;
    margin-bottom: 6px;
  }

  .hero-glow-1 {
    width: 250px;
    height: 250px;
  }

  .hero-glow-2 {
    width: 200px;
    height: 200px;
  }

  .hero-glow-3 {
    width: 150px;
    height: 150px;
  }

  .hero-terminal {
    margin-top: 28px;
    width: 100%;
  }

  .hero-terminal .terminal-body {
    min-height: 180px;
    max-height: 180px;
    font-size: 0.78rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-top: 28px;
  }

  .btn-hero-primary {
    padding: 12px 28px;
    font-size: 0.92rem;
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  .btn-hero-secondary {
    padding: 10px 22px;
    font-size: 0.85rem;
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }

  /* Feature grid */
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .feature-card {
    padding: 30px 25px;
  }

  /* Module grid */
  .level-modules-grid {
    grid-template-columns: 1fr;
  }

  /* Cheat grid */
  .cheat-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  /* Section title */
  .section-title {
    margin-bottom: 40px;
  }

  /* Module header */
  .module-header {
    flex-wrap: wrap;
    gap: 10px;
  }

  .module-header .module-title {
    order: -1;
    flex-basis: 100%;
    text-align: left;
    font-size: 1.1rem;
  }

  /* Step timeline */
  .steps-timeline {
    padding-left: 48px;
  }
  .steps-timeline::before {
    left: 14px;
  }
  [dir="rtl"] .steps-timeline {
    padding-left: 0;
    padding-right: 48px;
  }
  [dir="rtl"] .steps-timeline::before {
    left: auto;
    right: 14px;
  }
  .step-timeline-node {
    left: -48px;
  }
  [dir="rtl"] .step-timeline-node {
    left: auto;
    right: -48px;
  }
  .step-number {
    width: 30px;
    height: 30px;
    font-size: 0.75rem;
  }
  .steps-timeline .step-completed::after {
    left: -35px;
    top: 54px;
  }
  [dir="rtl"] .steps-timeline .step-completed::after {
    left: auto;
    right: -35px;
  }
  .step-card .step-header {
    padding: 14px 16px;
    flex-wrap: wrap;
    gap: 8px;
  }
  .step-card .step-body {
    padding: 12px 16px 14px;
  }
  .step-card .step-footer {
    padding: 10px 16px;
  }
  .step-card:hover {
    transform: translateX(2px);
  }
  [dir="rtl"] .step-card:hover {
    transform: translateX(-2px);
  }
  .step-title { font-size: 1rem; }
  .step-label { font-size: 0.62rem; }
  .step-footer-label { display: none; }
  .step-callouts { gap: 6px; }
  .step-vscode, .step-tip, .step-warning, .step-explain {
    font-size: 0.78rem;
    padding: 8px 12px;
    gap: 8px;
  }
  .step-vscode strong, .step-tip strong, .step-warning strong, .step-explain strong {
    display: block;
    margin-bottom: 2px;
  }
  .os-tab {
    padding: 5px 12px;
    font-size: 0.72rem;
    gap: 4px;
  }
  .os-tabs {
    gap: 4px;
    flex-wrap: nowrap;
  }
  .step-cmd-section {
    padding: 10px 12px;
  }
  .step-output {
    padding: 12px 14px;
    font-size: 0.78rem;
  }
  .step-diagram {
    padding: 12px 14px;
  }
  .step-diagram-label {
    font-size: 0.66rem;
    margin-bottom: 10px;
  }
  .ba-label {
    font-size: 0.6rem;
    padding: 4px 8px;
  }
  .ba-area {
    font-size: 0.7rem;
    padding: 6px 8px;
  }

  /* Workflow content */
  .workflow-content {
    padding: 25px;
  }

  .visualizer-container {
    padding: 20px;
  }

  .visualizer-controls {
    gap: 8px;
  }

  .viz-btn {
    padding: 8px 14px;
    font-size: 0.8rem;
  }

  .workflow-tabs {
    gap: 8px;
  }

  .workflow-tabs .tab-btn,
  .workflow-tab {
    padding: 8px 16px;
    font-size: 0.82rem;
  }

  /* Quiz */
  .quiz-controls {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Path filter scroll */
  .path-filter {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 8px;
  }

  .path-filter::-webkit-scrollbar {
    display: none;
  }

  .path-filter .filter-btn {
    white-space: nowrap;
    flex-shrink: 0;
    padding: 8px 18px;
    font-size: 0.82rem;
  }
}

/* Small phones */
@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding-inline: 15px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  .hero-stats .stat-card {
    padding: 12px 8px 10px;
  }

  .stat-card .stat-number {
    font-size: 1.3rem;
  }

  .stat-card .stat-label {
    font-size: 0.62rem;
  }

  .stat-icon {
    font-size: 0.9rem;
    margin-bottom: 4px;
  }

  .hero-terminal .terminal-body {
    min-height: 150px;
    max-height: 150px;
  }

  .feature-card,
  .module-card,
  .quiz-card,
  .cheat-card {
    border-radius: var(--radius-md);
  }

  .step-command {
    font-size: 0.8rem;
    padding: 12px 15px;
  }

  .terminal-body {
    font-size: 12px;
    padding: 15px;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.9rem;
  }

  .modal-content {
    padding: 20px;
    border-radius: var(--radius-lg);
    width: 95%;
  }

  .navbar {
    height: 56px;
    padding: 0 12px;
  }

  .nav-links {
    top: 56px;
  }

  .nav-brand {
    font-size: 1.1rem;
  }

  .scroll-top {
    width: 44px;
    height: 44px;
    bottom: 20px;
    right: 20px;
  }

  [dir="rtl"] .scroll-top {
    right: auto;
    left: 20px;
  }

  .workflow-content {
    padding: 20px 15px;
  }

  .visualizer-container {
    padding: 15px;
  }

  .viz-btn {
    padding: 7px 12px;
    font-size: 0.75rem;
    gap: 5px;
  }

  .workflow-tabs .tab-btn,
  .workflow-tab {
    padding: 7px 12px;
    font-size: 0.78rem;
  }

  .footer-content {
    gap: 25px;
  }

  .footer-bottom p {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .footer-separator {
    display: none;
  }

  .author-info {
    flex-direction: column;
    text-align: center;
  }

  .author-details {
    align-items: center;
  }

  .author-links {
    justify-content: center;
  }

  .hero-title-gradient {
    font-size: clamp(1.8rem, 8vw, 2.5rem);
  }

  .quiz-card {
    padding: 20px 15px;
  }

  .cheat-item {
    flex-wrap: wrap;
  }

  .cheat-desc {
    flex: 0 0 100%;
    min-width: unset;
  }
}

/* ==========================================================
   20. Print Styles
   ========================================================== */

@media print {
  .navbar,
  .footer,
  .terminal,
  .hero-terminal,
  .nav-controls,
  .nav-right,
  .hamburger,
  .scroll-top,
  .modal-overlay,
  .progress-indicator,
  .loader,
  .path-filter,
  .quiz-controls,
  .visualizer-controls,
  .workflow-tabs,
  .btn,
  .copy-btn,
  .os-tabs,
  #theme-toggle,
  #lang-toggle,
  #os-select {
    display: none !important;
  }

  body {
    background: #ffffff !important;
    color: #000000 !important;
    font-size: 12pt;
    line-height: 1.5;
  }

  .hero-section {
    min-height: auto !important;
    background: none !important;
    padding: 20px 0 !important;
    color: #000000 !important;
  }

  .hero-title-gradient,
  .hero-content h1,
  .hero-content p {
    color: #000000 !important;
    -webkit-text-fill-color: #000000 !important;
    background: none !important;
  }

  section {
    padding: 20px 0 !important;
    page-break-inside: avoid;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }

  .feature-grid,
  .level-modules-grid,
  .cheat-grid {
    grid-template-columns: 1fr !important;
  }

  .feature-card,
  .module-card,
  .cheat-card,
  .step-card,
  .quiz-card {
    box-shadow: none !important;
    border: 1px solid #cccccc !important;
    break-inside: avoid;
  }

  a {
    color: #000000 !important;
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666666;
  }
}

/* ==========================================================
   21. Accessibility
   ========================================================== */

/* Focus visible ring */
:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .hero-section {
    animation: none !important;
  }

  .fade-in,
  .slide-up,
  .slide-in-left,
  .slide-in-right {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Auto dark theme via OS preference (when no manual selection) */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --primary: #8B5CF6;
    --primary-light: #A78BFA;
    --primary-dark: #6D28D9;
    --bg-primary: #0a0514;
    --bg-secondary: #150a2b;
    --bg-tertiary: #0f0720;
    --bg-card: #150a2b;
    --text-primary: #ECE9F7;
    --text-secondary: #b2a9d1;
    --text-muted: #8478a8;
    --border-color: #2b1a4a;
    --border-strong: #3c2766;
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.55);
  }

  :root:not([data-theme]) .navbar {
    background: rgba(10, 5, 20, 0.85);
  }
}

/* Skip to content link for screen readers */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary);
  color: #ffffff;
  padding: 8px 16px;
  z-index: 10001;
  transition: top 0.3s ease;
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  top: 0;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ==========================================================
   22. RTL Support
   ========================================================== */

[dir="rtl"] {
  direction: rtl;
  text-align: right;
}

[dir="rtl"] .nav-brand {
  flex-direction: row;
}

[dir="rtl"] .nav-links a::after {
  left: 50%;
  transform: translateX(-50%) scaleX(0);
}

[dir="rtl"] .nav-links a:hover::after,
[dir="rtl"] .nav-links a.active::after {
  transform: translateX(-50%) scaleX(1);
}

[dir="rtl"] .feature-card::before {
  transform-origin: right;
}

[dir="rtl"] .terminal-dots {
  order: 2;
  margin-inline-start: auto;
}

[dir="rtl"] .terminal-title {
  left: 50%;
  transform: translateX(-50%);
}

[dir="rtl"] .terminal-prompt::before {
  content: "$ ";
}

[dir="rtl"] .footer-links a:hover {
  padding-inline-start: 8px;
  padding-inline-end: 0;
}

[dir="rtl"] .hero-buttons {
  flex-direction: row;
}

@media (max-width: 768px) {
  [dir="rtl"] .hero-buttons {
    flex-direction: column;
  }
}

[dir="rtl"] .module-card-header {
  flex-direction: row;
}

[dir="rtl"] .cheat-category {
  flex-direction: row;
}

[dir="rtl"] .cheat-command {
  text-align: left;
  direction: ltr;
}
[dir="rtl"] .cheat-desc {
  text-align: right;
}

[dir="rtl"] .quiz-controls {
  flex-direction: row;
}

[dir="rtl"] .quiz-question {
  flex-direction: row;
  text-align: right;
}

[dir="rtl"] .quiz-option {
  flex-direction: row;
  text-align: right;
}

[dir="rtl"] .quiz-option.correct::after,
[dir="rtl"] .quiz-option.incorrect::after {
  margin-inline-start: 0;
  margin-inline-end: auto;
}

[dir="rtl"] .quiz-explanation {
  text-align: right;
}

[dir="rtl"] .quiz-score {
  flex-direction: row;
}

[dir="rtl"] .quiz-level-selector {
  flex-direction: row;
}

[dir="rtl"] .workflow-steps li {
  padding: 15px 55px 15px 15px;
}

[dir="rtl"] .workflow-steps li::before {
  left: auto;
  right: 10px;
}

[dir="rtl"] .step-vscode,
[dir="rtl"] .step-tip,
[dir="rtl"] .step-warning,
[dir="rtl"] .step-explain {
  flex-direction: row;
}
[dir="rtl"] .step-output-label,
[dir="rtl"] .step-diagram-label {
  flex-direction: row;
}

[dir="rtl"] .module-header {
  flex-direction: row;
}

[dir="rtl"] .module-header .back-btn,
[dir="rtl"] .module-header .btn-back {
  flex-direction: row;
}
[dir="rtl"] .module-header .back-btn i,
[dir="rtl"] .module-header .btn-back i {
  transform: scaleX(-1);
}

[dir="rtl"] .step-header {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 12px;
}
[dir="rtl"] .step-label {
  text-align: right;
}
[dir="rtl"] .step-title {
  text-align: right;
}
[dir="rtl"] .step-description {
  text-align: right;
}
[dir="rtl"] .step-footer {
  display: flex;
  flex-direction: row-reverse;
}
[dir="rtl"] .btn-run {
  margin-inline-start: auto;
}
[dir="rtl"] .btn-run .fa-play {
  transform: scaleX(-1);
}
[dir="rtl"] .btn-module .fa-play {
  transform: scaleX(-1);
}
[dir="rtl"] .step-explain {
  text-align: right;
}
[dir="rtl"] .module-meta {
  justify-content: flex-end;
}
[dir="rtl"] .module-card-body h3 {
  text-align: right;
}
[dir="rtl"] .module-card-body .module-desc,
[dir="rtl"] .module-card-body p {
  text-align: right;
}
[dir="rtl"] .module-tags {
  justify-content: flex-end;
}
[dir="rtl"] .module-card-footer {
  flex-direction: row;
}
[dir="rtl"] .module-nav {
  flex-direction: row;
}
[dir="rtl"] .module-nav .btn i {
  transform: scaleX(-1);
}
[dir="rtl"] .level-section-header {
  flex-direction: row;
}
[dir="rtl"] .level-info {
  text-align: right;
}

[dir="rtl"] .hero-content {
  text-align: center;
}

[dir="rtl"] .modal-header {
  flex-direction: row;
}

/* ==========================================================
   23. Utility Classes
   ========================================================== */

.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

[dir="rtl"] .text-left  { text-align: right; }
[dir="rtl"] .text-right { text-align: left; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.mx-auto { margin-inline: auto; }

.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 1rem; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

.hidden  { display: none !important; }
.visible { display: block; }

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.gap-4 { gap: 1.5rem; }

/* Glass morphism */
.glass {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] .glass {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.08);
}

/* Gradient text */
.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-secondary {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-accent {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
}

.badge-primary {
  background: rgba(64, 0, 165, 0.1);
  color: var(--primary);
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

/* Tooltip */
.tooltip {
  position: relative;
  cursor: help;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) scale(0.9);
  padding: 6px 12px;
  background: #0a0514;
  color: #ECE9F7;
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 100;
}

.tooltip::before {
  content: '';
  position: absolute;
  bottom: calc(100% + 2px);
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: #0a0514;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
  z-index: 100;
}

.tooltip:hover::after,
.tooltip:hover::before {
  opacity: 1;
}

.tooltip:hover::after {
  transform: translateX(-50%) scale(1);
}

/* Divider */
.divider {
  height: 1px;
  background: var(--border-color);
  margin: 20px 0;
  border: none;
}

/* Truncate */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Aspect ratio wrappers */
.aspect-video {
  aspect-ratio: 16 / 9;
}

.aspect-square {
  aspect-ratio: 1 / 1;
}

/* Smooth custom scrollbar (global) */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Selection color */
::selection {
  background: rgba(64, 0, 165, 0.25);
  color: var(--text-primary);
}

/* Placeholder styling */
::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

/* ==========================================================
   24. Missing Rules — Bridging HTML/JS class names to CSS
   ========================================================== */

/* --- Navbar: flex layout (no .container wrapper in HTML) --- */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

/* --- Section Header (HTML uses .section-header, CSS had .section-title) --- */
.section-header {
  text-align: center;
  margin-bottom: 50px;
  padding-inline: 20px;
}

.section-header h2 {
  font-weight: 800;
  margin-bottom: 15px;
  position: relative;
  display: inline-block;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section-header h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: 2px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin-inline: auto;
}

.section-header.light h2 {
  background: none;
  -webkit-background-clip: unset;
  background-clip: unset;
  -webkit-text-fill-color: #ffffff;
  color: #ffffff;
}

.section-header.light p {
  color: rgba(255, 255, 255, 0.75);
}

.section-header.light h2::after {
  background: linear-gradient(90deg, #4000A5, #00C2FF);
}

/* --- Section horizontal padding (no container wrappers) --- */
.features-section,
.learning-section,
.cheatsheet-section,
.quiz-section,
.workflows-section,
.visualizer-section,
.terminal-section,
.module-section,
.footer {
  padding-left: clamp(20px, 5vw, 80px);
  padding-right: clamp(20px, 5vw, 80px);
}

/* Constrain content width inside sections */
.feature-grid,
.module-grid,
.cheat-grid,
.quiz-container,
.quiz-controls,
.visualizer-container,
.playground-container,
.path-filter,
.progress-overview,
.workflow-tabs,
.workflow-content,
.module-header,
.module-content {
  max-width: 1200px;
  margin-inline: auto;
}

/* --- Terminal dots (HTML uses dot-red etc, CSS had .dot.red) --- */
.dot-red { background: #F43F5E; }
.dot-yellow { background: #F59E0B; }
.dot-green { background: #2DD4BF; }

/* --- OS content show/hide for module steps --- */
.os-content { display: none; }
.os-content.active { display: block; }
.os-content.os-switch-flash {
  animation: osSwitchFlash 0.4s ease;
}
@keyframes osSwitchFlash {
  0% { opacity: 0.3; transform: translateY(4px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* --- Progress overview (overall progress in learning section) --- */
.progress-overview {
  margin-top: 40px;
  padding: 25px 30px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

.progress-overview:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.progress-overview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.progress-overview-header h3 {
  font-size: 1rem;
}

.progress-percentage {
  font-weight: 700;
  color: var(--primary);
  font-size: 1rem;
}

.progress-bar-container {
  width: 100%;
  height: 10px;
  background: var(--bg-tertiary);
  border-radius: 5px;
  overflow: hidden;
}

.progress-bar-container.small {
  height: 6px;
}

.progress-bar-container .progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 5px;
  transition: width 0.5s ease;
}

/* --- Module card footer progress bar (small) --- */
.progress-bar-small {
  flex: 1;
  height: 5px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.progress-fill-small {
  height: 100%;
  background: var(--card-gradient, var(--gradient-primary));
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* --- Visualizer buttons (HTML uses .viz-btn) --- */
.viz-btn {
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
  color: #ffffff;
}

.viz-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.viz-btn[data-action="init"]   { background: var(--gradient-primary); }
.viz-btn[data-action="commit"] { background: var(--gradient-accent); }
.viz-btn[data-action="branch"] { background: var(--gradient-success); }
.viz-btn[data-action="merge"]  { background: var(--gradient-secondary); }
.viz-btn[data-action="reset"]  { background: var(--gradient-warm); }

.viz-btn-danger,
.viz-btn.viz-btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626) !important;
}

.viz-btn-danger:hover {
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

/* --- Workflow tab buttons (HTML uses .workflow-tab) --- */
.workflow-tab {
  padding: 10px 24px;
  border-radius: 50px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.workflow-tab:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.workflow-tab.active {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(64, 0, 165, 0.3);
}

/* --- Quiz level buttons (HTML uses .quiz-level-btn) --- */
.quiz-level-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.quiz-level-btn {
  padding: 10px 22px;
  border-radius: 50px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.quiz-level-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.quiz-level-btn.active {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(64, 0, 165, 0.3);
}

.quiz-score-display {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--primary);
}

.quiz-score-display i {
  font-size: 1.3rem;
  color: #f59e0b;
}

.quiz-score-value {
  font-weight: 800;
}

/* --- Quick command buttons (JS uses .quick-cmd-btn) --- */
.quick-cmd-btn {
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-family: var(--font-code);
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  text-align: left;
  transition: all 0.3s ease;
}

[dir="rtl"] .quick-cmd-btn {
  direction: ltr;
  text-align: left;
}

.quick-cmd-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(64, 0, 165, 0.1);
}

/* --- Typing cursor for hero terminal animation --- */
.typing-cursor::after {
  content: '';
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--accent);
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
  margin-left: 2px;
}


.step-output-label {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* --- Module content & navigation --- */
.module-content {
  max-width: 900px;
  margin-inline: auto;
}

.module-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 40px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
}

.module-header .module-title {
  flex: 1;
  font-size: 1.3rem;
}

/* --- Button variants --- */
.btn-back {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: 50px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn-back:hover {
  color: var(--primary);
  border-color: var(--primary);
}

.btn-module {
  background: var(--card-gradient, var(--gradient-primary));
  color: #ffffff;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.btn-module:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(64, 0, 165, 0.3);
}

.btn-step-complete {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.3s ease;
}

.btn-step-complete:hover {
  border-color: var(--success);
  color: var(--success);
}

.btn-step-complete.completed {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border-color: var(--success);
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 50px;
  font-weight: 500;
  transition: all 0.3s ease;
}

/* --- Quiz result display --- */
.quiz-result-content {
  text-align: center;
  padding: 40px;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  max-width: 500px;
  margin: 20px auto;
  animation: scaleIn 0.3s ease;
}

.quiz-result-content .quiz-result-score {
  font-size: 4rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  margin-bottom: 10px;
}

.quiz-result-content .quiz-result-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 25px;
}

.result-excellent .quiz-result-score {
  background: linear-gradient(135deg, #10b981, #34d399);
  -webkit-background-clip: text;
  background-clip: text;
}

.result-good .quiz-result-score {
  background: linear-gradient(135deg, #f59e0b, #fbbf24);
  -webkit-background-clip: text;
  background-clip: text;
}

.result-review .quiz-result-score {
  background: linear-gradient(135deg, #ef4444, #f87171);
  -webkit-background-clip: text;
  background-clip: text;
}

/* --- Quiz option letter (JS uses .quiz-option-letter) --- */
.quiz-option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.quiz-option:hover .quiz-option-letter {
  background: var(--primary);
  color: #ffffff;
}

/* --- Footer elements --- */
.footer-content {
  padding-inline: clamp(20px, 5vw, 80px);
}

.footer-bottom {
  padding-inline: clamp(20px, 5vw, 80px);
}

.footer-social {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #b2a9d1;
  font-size: 1.1rem;
  transition: all 0.3s ease;
}

.footer-social a:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-3px);
}

.footer-column h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: #ECE9F7;
}

.footer-column.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-column.footer-links a {
  color: #b2a9d1;
  font-size: 0.9rem;
  transition: color 0.3s ease, padding-inline-start 0.3s ease;
}

.footer-column.footer-links a:hover {
  color: #ffffff;
  padding-inline-start: 8px;
}

.author-info {
  display: flex;
  align-items: center;
  gap: 15px;
}

.author-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: #ffffff;
  flex-shrink: 0;
}

.author-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.author-details strong {
  color: #ECE9F7;
  font-size: 1rem;
}

.author-details span {
  color: #b2a9d1;
  font-size: 0.85rem;
}

.author-links {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.author-links a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: #a78bfa;
  font-size: 0.8rem;
  text-decoration: none;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(139,92,246,0.1);
  border: 1px solid rgba(139,92,246,0.2);
  transition: all 0.3s ease;
}

.author-links a:hover {
  background: rgba(139,92,246,0.2);
  border-color: rgba(139,92,246,0.4);
  color: #c4b5fd;
  transform: translateY(-1px);
}

.footer-separator {
  margin: 0 10px;
  color: #2b1a4a;
}

/* --- Terminal sidebar elements --- */
.sidebar-title {
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 15px;
}

.terminal-toolbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  border-top: 1px solid rgba(139, 92, 246, 0.1);
  direction: ltr;
}

.terminal-toolbar .term-bottom-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.terminal-help {
  margin-top: 0;
  padding: 8px 16px;
  background: rgba(139, 92, 246, 0.06);
  border-top: 1px solid rgba(139, 92, 246, 0.08);
}

.terminal-help p {
  color: #8478a8;
  font-size: 0.8rem;
  margin-bottom: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-help code {
  background: rgba(0, 194, 255, 0.15);
  color: var(--accent);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-code);
  font-size: 0.8rem;
}

/* --- Cheat search icon positioning --- */
.cheat-search > i {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}

[dir="rtl"] .cheat-search > i {
  left: auto;
  right: 20px;
}

/* --- Dark mode: override inline background gradients --- */
[data-theme="dark"] .features-section,
[data-theme="dark"] .cheatsheet-section,
[data-theme="dark"] .quiz-section {
  background: var(--bg-secondary) !important;
}

[data-theme="dark"] .learning-section {
  background: var(--bg-primary) !important;
}

/* --- Workflow SVG and description (dark section) --- */

/* --- Quiz container constrain --- */
.quiz-container {
  max-width: 900px;
  margin-inline: auto;
}

/* --- Level-grouped module layout --- */
.level-section {
  margin-bottom: 48px;
}

.level-section:last-child {
  margin-bottom: 0;
}

.level-section-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border-color);
}

.level-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.level-info h3 {
  margin: 0;
  font-size: 1.4rem;
  color: var(--text-primary);
}

.level-count {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.level-modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(350px, 100%), 1fr));
  gap: 25px;
}

@media (max-width: 768px) {
  .level-modules-grid {
    grid-template-columns: 1fr;
  }

  .level-section-header {
    gap: 12px;
  }

  .level-icon {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .level-info h3 {
    font-size: 1.15rem;
  }
}

/* --- Run button for step commands --- */
.btn-run {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 18px;
  background: linear-gradient(135deg, var(--success), #059669);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  margin-top: 10px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 6px rgba(16, 185, 129, 0.25);
}

.btn-run:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 3px 12px rgba(16, 185, 129, 0.35);
}

.btn-run:disabled {
  cursor: default;
  opacity: 0.9;
}

.btn-run-done {
  background: linear-gradient(135deg, #4000A5, #00C2FF);
  box-shadow: 0 2px 6px rgba(64, 0, 165, 0.25);
}

.step-output-hidden {
  display: none !important;
}

.step-output-reveal {
  display: block !important;
  animation: revealOutput 0.5s ease-out;
}

@keyframes revealOutput {
  from {
    opacity: 0;
    transform: translateY(-10px);
    max-height: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
    max-height: 1000px;
  }
}

/* Step explanation (what happened) */
.step-explain {
  background: rgba(64, 0, 165, 0.05);
  border: 1px solid rgba(64, 0, 165, 0.1);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 0;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.84rem;
  line-height: 1.55;
}

[dir="rtl"] .step-explain {
  border: 1px solid rgba(64, 0, 165, 0.1);
  flex-direction: row;
}

.step-explain i {
  color: var(--primary);
  font-size: 0.9rem;
  margin-top: 2px;
  flex-shrink: 0;
}

.step-run-result .step-output {
  margin-bottom: 0;
}

.step-run-result .step-explain {
  margin-top: 12px;
}

.step-run-result .step-diagram {
  margin-top: 12px;
}

/* --- Visualizer inline input (replaces prompt) --- */
.viz-input-panel {
  background: var(--bg-card);
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-top: 12px;
  animation: revealOutput 0.3s ease-out;
}

.viz-input-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.viz-input-label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
  white-space: nowrap;
}

.viz-input-field {
  flex: 1;
  min-width: 160px;
  padding: 10px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  transition: border-color 0.3s;
}

.viz-input-field:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(64, 0, 165, 0.15);
}

.viz-input-select {
  padding: 10px 14px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Fira Code', monospace;
  cursor: pointer;
  min-width: 120px;
}

.viz-input-select:focus {
  outline: none;
  border-color: var(--primary);
}

.viz-input-ok,
.viz-input-cancel {
  padding: 10px 16px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.2s;
}

.viz-input-ok {
  background: var(--success);
  color: #fff;
}

.viz-input-ok:hover {
  background: #059669;
  transform: translateY(-1px);
}

.viz-input-cancel {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.viz-input-cancel:hover {
  background: var(--danger);
  color: #fff;
}

/* --- Visualizer workflow status bar --- */
.viz-workflow-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 20px 16px;
  flex-wrap: wrap;
  direction: ltr;
}

.viz-status-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
  border: 2px solid rgba(255,255,255,0.1);
  min-width: 100px;
  transition: all 0.4s ease;
  opacity: 0.45;
}

.viz-status-area i {
  font-size: 1.3rem;
  color: var(--text-muted);
  transition: color 0.4s;
}

.viz-status-area span {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 600;
  text-align: center;
  transition: color 0.4s;
}

.viz-status-active {
  opacity: 1;
  border-color: var(--area-color);
  background: var(--bg-card);
}

.viz-status-active i {
  color: var(--area-color);
}

.viz-status-active span {
  color: var(--text-primary);
}

.viz-status-highlight {
  box-shadow: 0 0 0 3px rgba(64, 0, 165, 0.2);
  transform: scale(1.05);
}

.viz-status-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  opacity: 0.3;
  transition: all 0.4s;
}

.viz-status-arrow span {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-family: 'Fira Code', monospace;
  white-space: nowrap;
}

.viz-status-arrow i {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.viz-arrow-active {
  opacity: 1;
}

.viz-arrow-active span,
.viz-arrow-active i {
  color: var(--primary);
}

/* --- Visualizer next steps --- */
.viz-next-steps {
  padding: 0 20px 16px;
}

.viz-next-header {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--warning);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.viz-next-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.viz-next-item {
  padding: 6px 14px;
  background: var(--bg-tertiary);
  border-radius: 20px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.viz-next-item i {
  color: var(--primary);
  font-size: 0.7rem;
}

[dir="rtl"] .viz-btn .fa-play { transform: scaleX(-1); }
[dir="rtl"] .viz-next-item .fa-chevron-right { transform: scaleX(-1); }
[dir="rtl"] .visualizer-info { text-align: right; }

.viz-next-btn {
  padding: 8px 18px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border: none;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.25s ease;
  box-shadow: 0 2px 8px rgba(64, 0, 165, 0.25);
}

.viz-next-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(64, 0, 165, 0.4);
  filter: brightness(1.1);
}

.viz-next-btn:active {
  transform: translateY(0);
}

.viz-next-btn i {
  font-size: 0.7rem;
}

/* --- Mini flow diagrams for module steps --- */
.step-diagram {
  margin-top: 14px;
  background: rgba(139, 92, 246, 0.02);
  border-radius: 10px;
  padding: 16px 18px;
  border: 1px solid rgba(139, 92, 246, 0.08);
}

.step-diagram-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  gap: 6px;
}
.step-diagram-label i {
  color: var(--primary);
  opacity: 0.6;
}

.mini-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex-wrap: wrap;
  direction: ltr;
}

.mini-flow-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1.5px solid var(--border-color);
  background: var(--bg-card);
  min-width: 72px;
  opacity: 0.3;
  transition: all 0.3s;
}

.mini-flow-active {
  opacity: 1;
  border-color: var(--area-color);
  background: var(--bg-card);
}

.mini-flow-highlight {
  box-shadow: 0 0 12px rgba(var(--area-color-rgb, 139, 92, 246), 0.15);
}

.mini-flow-icon {
  font-size: 1rem;
  color: var(--area-color);
}

.mini-flow-label {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.2;
}

.mini-flow-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1px;
  opacity: 0.25;
  transition: all 0.3s;
  flex-shrink: 0;
}

.mini-flow-arrow-active {
  opacity: 1;
}

.mini-flow-arrow-label {
  font-size: 0.58rem;
  font-family: 'Fira Code', monospace;
  color: var(--text-muted);
  white-space: nowrap;
}

.mini-flow-arrow-active .mini-flow-arrow-label {
  color: var(--primary);
  font-weight: 600;
}

.mini-flow-arrow i {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.mini-flow-arrow-active i {
  color: var(--primary);
}

/* --- Before / After step visualization --- */
.step-before-after {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-bottom: 14px;
  direction: ltr;
}

.ba-column {
  flex: 1;
  min-width: 0;
}

.ba-label {
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 5px 12px;
  border-radius: 8px 8px 0 0;
  text-align: center;
}

.ba-before .ba-label {
  background: rgba(251, 146, 60, 0.1);
  color: #fb923c;
}

.ba-after .ba-label {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
}

.ba-areas {
  padding: 10px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0 0 8px 8px;
  min-height: 70px;
}

.ba-area {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 6px;
  margin-bottom: 5px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-left: 2px solid var(--area-color);
  background: transparent;
}

[dir="rtl"] .ba-area {
  border-left: none;
  border-right: 2px solid var(--area-color);
}

.ba-area i {
  color: var(--area-color);
  font-size: 0.85rem;
  flex-shrink: 0;
}

.ba-area span {
  flex-shrink: 0;
}

.ba-changed {
  background: rgba(16, 185, 129, 0.05);
}

.ba-new {
  background: rgba(16, 185, 129, 0.06);
  border-left-color: #10b981;
}

[dir="rtl"] .ba-new {
  border-left-color: transparent;
  border-right-color: #10b981;
}

.ba-removed {
  opacity: 0.45;
  text-decoration: line-through;
}

.ba-files {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-left: 4px;
  flex: 1;
  min-width: 0;
}

.ba-file {
  font-size: 0.68rem;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ba-file-normal { color: var(--text-muted); }
.ba-file-modified { color: #f59e0b; }
.ba-file-new { color: #10b981; }
.ba-file-removed { color: #ef4444; text-decoration: line-through; }

.ba-branches {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
  padding: 0 10px;
}

.ba-branch {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(64, 0, 165, 0.08);
  color: var(--branch-color);
  border: 1px solid var(--branch-color);
  display: flex;
  align-items: center;
  gap: 4px;
}

.ba-branch-new {
  background: rgba(16, 185, 129, 0.15);
  border-color: #10b981;
  animation: pulseNew 1.5s ease-in-out;
}

@keyframes pulseNew {
  0%, 100% { box-shadow: none; }
  50% { box-shadow: 0 0 8px rgba(16, 185, 129, 0.4); }
}

.ba-commits {
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-top: 6px;
  padding: 0 10px;
}

.ba-commit {
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: 5px;
  background: rgba(139, 92, 246, 0.04);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.ba-hash {
  font-family: 'Fira Code', monospace;
  font-size: 0.65rem;
  color: var(--primary);
  font-weight: 600;
}

.ba-commit-new {
  background: rgba(16, 185, 129, 0.1);
  border-left: 2px solid #10b981;
  color: #10b981;
}

[dir="rtl"] .ba-commit-new {
  border-left: none;
  border-right: 2px solid #10b981;
}

.ba-commit-removed {
  background: rgba(239, 68, 68, 0.08);
  text-decoration: line-through;
  opacity: 0.6;
  color: #ef4444;
}

.ba-arrow-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
  min-width: 64px;
  flex-shrink: 0;
}

.ba-cmd {
  font-family: 'Fira Code', monospace;
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--primary);
  text-align: center;
  margin-bottom: 3px;
  white-space: nowrap;
  padding: 2px 8px;
  background: rgba(139, 92, 246, 0.06);
  border-radius: 4px;
}

.ba-arrow-line {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.3), var(--primary));
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  border-radius: 1px;
}

.ba-arrow-line i {
  color: var(--primary);
  font-size: 0.75rem;
  position: absolute;
  right: -8px;
}

@media (max-width: 600px) {
  .step-before-after {
    flex-direction: column;
    gap: 8px;
  }
  .ba-arrow-col {
    flex-direction: row;
    padding: 6px 0;
    min-width: auto;
  }
  .ba-arrow-line {
    width: 30px;
  }
}

@media (max-width: 600px) {
  .viz-workflow-status {
    gap: 6px;
    padding: 12px 10px;
  }

  .viz-status-area {
    min-width: 70px;
    padding: 10px 10px;
  }

  .viz-status-area span {
    font-size: 0.65rem;
  }

  .viz-input-inner {
    flex-direction: column;
    align-items: stretch;
  }

  .mini-flow {
    gap: 4px;
  }

  .mini-flow-area {
    min-width: 65px;
    padding: 8px 10px;
  }

  .mini-flow-label {
    font-size: 0.6rem;
  }
}

/* --- Best Practices & Pitfalls section --- */
/* Scenario Presets */
.viz-scenarios {
  margin-top: 48px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 clamp(20px, 5vw, 80px);
}

.viz-scenarios-title {
  font-size: 1.5rem;
  color: #ffffff;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
}

.viz-scenarios-title i {
  color: #f59e0b;
}

.viz-scenarios-subtitle {
  text-align: center;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.viz-scenario-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 24px;
}

.viz-scenario-tab {
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid rgba(139, 92, 246, 0.2);
  background: rgba(139, 92, 246, 0.06);
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 6px;
}

.viz-scenario-tab:hover {
  background: rgba(139, 92, 246, 0.12);
  border-color: rgba(139, 92, 246, 0.4);
  color: #fff;
}

.viz-scenario-tab.active {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 2px 12px rgba(139, 92, 246, 0.3);
}

.viz-scenario-tab i {
  font-size: 0.75rem;
}

.viz-scenario-layout {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.viz-scenario-top {
  display: flex;
  align-items: center;
  gap: 16px;
}

.viz-scenario-desc {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.92rem;
  line-height: 1.6;
  padding: 14px 18px;
  background: rgba(139, 92, 246, 0.06);
  border: 1px solid rgba(139, 92, 246, 0.12);
  border-radius: 10px;
  flex: 1;
}

.viz-scenario-bottom {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 20px;
  align-items: start;
}

.viz-scenario-left {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.viz-scenario-code {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.viz-scenario-code-header {
  padding: 10px 16px;
  background: #1a1030;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font-code);
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(139, 92, 246, 0.15);
}

.viz-scenario-code-header i {
  color: #2DD4BF;
}

.viz-scenario-code-body {
  background: #0a0514;
  padding: 16px;
  max-height: 400px;
  overflow-y: auto;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: #2b1a4a transparent;
}

.viz-scenario-line {
  font-family: var(--font-code);
  font-size: 0.82rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.5);
  padding: 2px 8px;
  border-radius: 4px;
  transition: all 0.3s ease;
  white-space: nowrap;
}

.viz-scenario-line.viz-line-active {
  background: rgba(139, 92, 246, 0.15);
  color: #fff;
  box-shadow: -3px 0 0 #8B5CF6;
}

.viz-scenario-line.viz-line-done {
  color: #2DD4BF;
}

.viz-scenario-line.viz-line-comment {
  color: rgba(255, 255, 255, 0.3);
  font-style: italic;
}

.viz-line-prompt {
  color: #2DD4BF;
  font-weight: 600;
}

.viz-scenario-play {
  align-self: flex-start;
  padding: 10px 20px;
  border-radius: 8px;
  border: 1px solid rgba(139, 92, 246, 0.3);
  background: rgba(139, 92, 246, 0.1);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.viz-scenario-play:hover {
  background: rgba(139, 92, 246, 0.2);
  border-color: var(--primary);
}

.viz-scenario-right {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.viz-scenario-canvas-wrap {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.viz-scenario-canvas-wrap canvas {
  display: block;
  width: 100%;
  height: 350px;
  background: #0a0514;
}

.viz-scenario-zoom-controls {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 10;
  display: flex;
  gap: 6px;
}

.viz-zoom-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid rgba(139, 92, 246, 0.4);
  background: rgba(10, 5, 20, 0.85);
  color: #e2e8f0;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  backdrop-filter: blur(6px);
}

.viz-zoom-btn:hover {
  background: rgba(139, 92, 246, 0.3);
  border-color: rgba(139, 92, 246, 0.7);
  transform: scale(1.1);
}

.viz-scenario-graph-info {
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(139, 92, 246, 0.1);
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.88rem;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.viz-step-counter {
  background: rgba(139, 92, 246, 0.15);
  color: #A78BFA;
  padding: 2px 10px;
  border-radius: 10px;
  font-size: 0.75rem;
  font-weight: 700;
  white-space: nowrap;
}

@media (max-width: 768px) {
  .viz-scenario-bottom {
    grid-template-columns: 1fr;
  }

  .viz-scenario-top {
    flex-direction: column;
  }

  .viz-scenario-tabs {
    gap: 6px;
  }

  .viz-scenario-tab {
    padding: 6px 12px;
    font-size: 0.75rem;
  }

  .viz-scenario-code-body {
    max-height: 240px;
  }

  .viz-scenario-canvas-wrap canvas {
    height: 280px;
  }
}

.viz-practices {
  margin-top: 48px;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 clamp(20px, 5vw, 80px);
}

.viz-practices-title {
  font-size: 1.5rem;
  color: #ffffff;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
}

.viz-practices-title i {
  color: var(--success);
}

.viz-practices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: 20px;
}

.viz-practice-card {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(139,92,246,0.15);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.viz-practice-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.viz-practice-card h4 {
  font-size: 1rem;
  color: #ffffff;
  margin-bottom: 14px;
}

.viz-practice-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.viz-practice-row code {
  font-family: 'Fira Code', monospace;
  font-size: 0.8rem;
  word-break: break-all;
}

.viz-practice-good {
  background: rgba(16, 185, 129, 0.08);
  border-left: 3px solid var(--success);
}

.viz-practice-good code {
  color: var(--success);
}

.viz-practice-bad {
  background: rgba(239, 68, 68, 0.08);
  border-left: 3px solid var(--danger);
}

.viz-practice-bad code {
  color: var(--danger);
}

.viz-practice-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.viz-practice-good .viz-practice-badge {
  color: var(--success);
}

.viz-practice-bad .viz-practice-badge {
  color: var(--danger);
}

.viz-practice-why {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.6);
  margin-top: 8px;
  line-height: 1.5;
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.viz-practice-why i {
  color: var(--primary);
  margin-top: 3px;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .viz-practices-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================
   Light Theme — Enhanced Colorful Overrides
   ========================================================== */

[data-theme="light"] .feature-card,
:root:not([data-theme="dark"]) .feature-card {
  background: linear-gradient(135deg, #ffffff 0%, #f0e8ff 100%);
  border-color: #c9bfe0;
}
[data-theme="light"] .feature-card:hover,
:root:not([data-theme="dark"]) .feature-card:hover {
  background: linear-gradient(135deg, #ffffff 0%, #e8deff 100%);
  border-color: var(--primary);
}

[data-theme="light"] .module-card,
:root:not([data-theme="dark"]) .module-card {
  background: linear-gradient(180deg, #ffffff 0%, #f3edff 100%);
  border-color: #c9bfe0;
}

[data-theme="light"] .cheat-card,
:root:not([data-theme="dark"]) .cheat-card {
  background: linear-gradient(135deg, #ffffff 0%, #eee8fc 100%);
  border-color: #c9bfe0;
}

[data-theme="light"] .quiz-card,
:root:not([data-theme="dark"]) .quiz-card {
  background: linear-gradient(135deg, #ffffff 0%, #f0e8ff 100%);
  border-color: #c9bfe0;
}

[data-theme="light"] .path-filter .filter-btn,
:root:not([data-theme="dark"]) .path-filter .filter-btn {
  background: #d6cce9;
  color: #33284d;
  border: 1px solid #c0b4d6;
}
[data-theme="light"] .path-filter .filter-btn:hover,
:root:not([data-theme="dark"]) .path-filter .filter-btn:hover {
  background: #c9bbdf;
  color: var(--primary);
  border-color: var(--primary);
}


[data-theme="light"] .cheat-search input,
:root:not([data-theme="dark"]) .cheat-search input {
  background: #f5f0ff;
  border-color: #c0b4d6;
}

[data-theme="light"] .quiz-level-btn,
:root:not([data-theme="dark"]) .quiz-level-btn {
  background: #d6cce9;
  border-color: #c0b4d6;
}

[data-theme="light"] .progress-bar-container,
:root:not([data-theme="dark"]) .progress-bar-container {
  background: #d6cce9;
}

[data-theme="light"] .progress-overview,
:root:not([data-theme="dark"]) .progress-overview {
  background: linear-gradient(135deg, #f5f0ff 0%, #ece4fa 100%);
  border-color: #c0b4d6;
}

[data-theme="light"] .steps-timeline::before,
:root:not([data-theme="dark"]) .steps-timeline::before {
  background: rgba(100, 50, 180, 0.12);
}

[data-theme="light"] .step-card,
:root:not([data-theme="dark"]) .step-card {
  background: #ffffff;
  border-color: #d4cbe6;
  box-shadow: 0 1px 4px rgba(100, 50, 180, 0.06);
}
[data-theme="light"] .step-card:hover,
:root:not([data-theme="dark"]) .step-card:hover {
  border-color: rgba(100, 50, 180, 0.3);
  box-shadow: 0 4px 16px rgba(100, 50, 180, 0.08);
}

[data-theme="light"] .step-cmd-section,
:root:not([data-theme="dark"]) .step-cmd-section {
  background: #f8f5ff;
  border-color: #e0d6f0;
}

[data-theme="light"] .step-footer,
:root:not([data-theme="dark"]) .step-footer {
  background: #faf8ff;
  border-top-color: #e8e0f4;
}

[data-theme="light"] .step-number,
:root:not([data-theme="dark"]) .step-number {
  background: #ffffff;
  color: rgba(100, 50, 180, 0.7);
  border-color: #d4cbe6;
}

[data-theme="light"] .step-number-done,
:root:not([data-theme="dark"]) .step-number-done {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}

[data-theme="light"] .step-number-current,
:root:not([data-theme="dark"]) .step-number-current {
  box-shadow: 0 0 14px rgba(100, 50, 180, 0.25);
}

[data-theme="light"] .steps-timeline .step-completed::after,
:root:not([data-theme="dark"]) .steps-timeline .step-completed::after {
  background: var(--success);
}

[data-theme="light"] .step-badge-concept,
:root:not([data-theme="dark"]) .step-badge-concept {
  background: rgba(59, 130, 246, 0.08);
  border-color: rgba(59, 130, 246, 0.15);
  color: #2563eb;
}
[data-theme="light"] .step-badge-concept i,
:root:not([data-theme="dark"]) .step-badge-concept i { color: #2563eb; }

[data-theme="light"] .step-badge-handson,
:root:not([data-theme="dark"]) .step-badge-handson {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.15);
  color: #059669;
}
[data-theme="light"] .step-badge-handson i,
:root:not([data-theme="dark"]) .step-badge-handson i { color: #059669; }

[data-theme="light"] .step-header,
:root:not([data-theme="dark"]) .step-header {
  border-bottom-color: #ebe4f4;
}

[data-theme="light"] .step-vscode,
:root:not([data-theme="dark"]) .step-vscode {
  background: rgba(0, 122, 204, 0.04);
  border-color: rgba(0, 122, 204, 0.12);
}

[data-theme="light"] .step-tip,
:root:not([data-theme="dark"]) .step-tip {
  background: rgba(245, 158, 11, 0.04);
  border-color: rgba(245, 158, 11, 0.12);
}

[data-theme="light"] .step-warning,
:root:not([data-theme="dark"]) .step-warning {
  background: rgba(239, 68, 68, 0.04);
  border-color: rgba(239, 68, 68, 0.12);
}

[data-theme="light"] .step-explain,
:root:not([data-theme="dark"]) .step-explain {
  background: rgba(100, 50, 180, 0.04);
  border-color: rgba(100, 50, 180, 0.1);
}

[data-theme="light"] .step-diagram,
:root:not([data-theme="dark"]) .step-diagram {
  background: rgba(100, 50, 180, 0.03);
  border-color: rgba(100, 50, 180, 0.08);
}

[data-theme="light"] .ba-areas,
:root:not([data-theme="dark"]) .ba-areas {
  background: #fff;
  border-color: #e0d6f0;
}

[data-theme="light"] .ba-cmd,
:root:not([data-theme="dark"]) .ba-cmd {
  background: rgba(100, 50, 180, 0.06);
}

[data-theme="light"] .ba-commit,
:root:not([data-theme="dark"]) .ba-commit {
  background: rgba(100, 50, 180, 0.04);
}

[data-theme="light"] .module-section,
:root:not([data-theme="dark"]) .module-section {
  background: linear-gradient(180deg, #e4daf4 0%, #ddd2f0 50%, #d0e4f8 100%);
}

[data-theme="light"] .cheat-command,
:root:not([data-theme="dark"]) .cheat-command {
  color: #4000A5;
  background: rgba(64, 0, 165, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
}


/* Terminal in light theme — keep dark bg but soften border/shadow */
[data-theme="light"] .terminal,
:root:not([data-theme="dark"]) .terminal {
  border: 1px solid rgba(64, 0, 165, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08), 0 1px 4px rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .terminal-header,
:root:not([data-theme="dark"]) .terminal-header {
  background: #1a1030;
  border-bottom: 1px solid #2b1a4a;
}

[data-theme="light"] .terminal-body,
:root:not([data-theme="dark"]) .terminal-body {
  color: #d4d4d8;
  background: #0a0514;
}

[data-theme="light"] .terminal-title,
:root:not([data-theme="dark"]) .terminal-title {
  color: rgba(255, 255, 255, 0.5);
}

[data-theme="light"] .terminal-command,
:root:not([data-theme="dark"]) .terminal-command {
  color: #ECE9F7;
}

[data-theme="light"] .terminal-prompt,
:root:not([data-theme="dark"]) .terminal-prompt {
  color: #00C2FF;
}

[data-theme="light"] .terminal-prompt::before,
:root:not([data-theme="dark"]) .terminal-prompt::before {
  color: #2DD4BF;
}

[data-theme="light"] .terminal-output,
:root:not([data-theme="dark"]) .terminal-output {
  color: #2DD4BF;
}

[data-theme="light"] .terminal-error,
:root:not([data-theme="dark"]) .terminal-error {
  color: #F43F5E;
}

[data-theme="light"] .terminal-info,
:root:not([data-theme="dark"]) .terminal-info {
  color: #00C2FF;
}

[data-theme="light"] .terminal-warning,
:root:not([data-theme="dark"]) .terminal-warning {
  color: #F59E0B;
}

[data-theme="light"] .terminal-comment,
:root:not([data-theme="dark"]) .terminal-comment {
  color: #8478a8;
}

[data-theme="light"] .terminal-input-line input,
:root:not([data-theme="dark"]) .terminal-input-line input {
  color: #ECE9F7;
}

[data-theme="light"] .terminal-input-line .prompt-symbol,
:root:not([data-theme="dark"]) .terminal-input-line .prompt-symbol {
  color: #2DD4BF;
}

[data-theme="light"] .btn-clear-term,
:root:not([data-theme="dark"]) .btn-clear-term {
  color: rgba(255, 255, 255, 0.4);
  border-color: rgba(139, 92, 246, 0.2);
}

/* ==========================================================
   End of stylesheet
   ========================================================== */