/* ============================================================
   Dr. Mohammad Arafah — Portfolio
   Modern, bilingual (EN/AR), light/dark theme
   ============================================================ */

/* Design tokens */
:root {
  /* Sygma brand palette */
  --brand: #4000A5;        /* primary — Sygma purple */
  --brand-2: #00C2FF;      /* accent — Sygma cyan */
  --brand-3: #2DD4BF;      /* accent — Sygma teal */
  --brand-dark: #1A1A1A;

  /* Icon accents (for variety) */
  --c-purple: #4000A5;
  --c-cyan:   #00C2FF;
  --c-teal:   #2DD4BF;
  --c-amber:  #F59E0B;
  --c-pink:   #EC4899;
  --c-green:  #10B981;
  --c-indigo: #6366F1;
  --c-rose:   #F43F5E;

  --bg: #f8fafc;
  --bg-elev: #ffffff;
  --bg-soft: #f3f0fa;
  --border: #e4e2ee;
  --border-strong: #cbc6dd;
  --text: #1A1A1A;
  --text-muted: #4b4563;
  --text-soft: #716a8a;
  --shadow-sm: 0 2px 6px rgba(64, 0, 165, 0.06);
  --shadow-md: 0 8px 24px rgba(64, 0, 165, 0.10);
  --shadow-lg: 0 20px 60px rgba(64, 0, 165, 0.16);
  --radius: 14px;
  --radius-lg: 22px;
  --radius-sm: 8px;
  --max: 1200px;
  --nav-h: 72px;
  --fs: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --fs-ar: 'Cairo', 'Inter', system-ui, -apple-system, Segoe UI, Tahoma, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme='dark'] {
  --bg: #0a0514;
  --bg-elev: #150a2b;
  --bg-soft: #0f0720;
  --border: #2b1a4a;
  --border-strong: #3c2766;
  --text: #ECE9F7;
  --text-muted: #b2a9d1;
  --text-soft: #8478a8;
  --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);
}

/* Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  font-family: var(--fs);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
}
html[lang='ar'] body { font-family: var(--fs-ar); line-height: 1.85; }
html[dir='rtl'] { direction: rtl; }

img { max-width: 100%; display: block; }
a { color: var(--brand); text-decoration: none; }
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.25; color: var(--text); }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Scroll progress */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--brand-3));
  z-index: 1000;
  transition: width 0.1s linear;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid transparent;
  z-index: 900;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
[data-theme='dark'] .navbar { background: rgba(10, 5, 20, 0.72); }
.navbar.scrolled {
  border-bottom-color: var(--border);
  box-shadow: 0 4px 24px -12px rgba(64, 0, 165, 0.15);
}

.nav-container {
  max-width: var(--max);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

/* Logo block */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
  transition: transform var(--transition);
}
.nav-logo:hover { transform: translateY(-1px); }

.logo-mark {
  position: relative;
  width: 44px;
  height: 44px;
  padding: 2px;
  border-radius: 50%;
  background: conic-gradient(from 120deg,
    var(--c-purple), var(--c-cyan), var(--c-teal), var(--c-purple));
  box-shadow: 0 4px 12px -4px rgba(64, 0, 165, 0.35);
  flex-shrink: 0;
}
.logo-mark::before {
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 50%;
  background: var(--bg-elev);
}
.logo-mark img {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  display: block;
  z-index: 1;
}
.logo-status {
  position: absolute;
  bottom: 0;
  inset-inline-end: 0;
  width: 12px;
  height: 12px;
  background: #10b981;
  border: 2.5px solid var(--bg-elev);
  border-radius: 50%;
  z-index: 2;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.55);
  animation: statusPulse 2.2s ease-out infinite;
}
@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.55); }
  80%, 100% { box-shadow: 0 0 0 7px rgba(16, 185, 129, 0); }
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}
.logo-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text);
}
.logo-role {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.01em;
  background: linear-gradient(90deg, var(--c-purple), var(--c-cyan), var(--c-teal));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-soft);
  padding: 4px;
  border-radius: 999px;
  border: 1px solid var(--border);
}
.nav-links a {
  position: relative;
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 13.5px;
  letter-spacing: -0.005em;
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
}
.nav-links a:hover {
  color: var(--text);
  background: var(--bg-elev);
}
.nav-links a.active {
  color: #fff;
  background: linear-gradient(135deg, var(--c-purple), var(--c-cyan));
  box-shadow: 0 2px 8px -2px rgba(64, 0, 165, 0.4);
}

/* Controls */
.nav-controls { display: flex; align-items: center; gap: 8px; }
.ctrl-btn {
  width: 40px; height: 40px;
  display: inline-flex; align-items: center; justify-content: center;
  gap: 6px;
  background: var(--bg-elev);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.ctrl-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--c-purple), var(--c-cyan));
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 0;
}
.ctrl-btn > * { position: relative; z-index: 1; }
.ctrl-btn:hover {
  color: #fff;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 14px -4px rgba(64, 0, 165, 0.35);
}
.ctrl-btn:hover::before { opacity: 1; }
#langToggle { width: auto; padding: 0 14px; }
#langToggle span { font-size: 12px; font-weight: 800; letter-spacing: 0.5px; }
#themeToggle i { transition: transform 0.4s ease; }
#themeToggle:hover i { transform: rotate(-20deg) scale(1.1); }
.menu-btn { display: none; }

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  padding: calc(var(--nav-h) + 40px) 0 60px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero-bg { position: absolute; inset: 0; overflow: hidden; z-index: 0; pointer-events: none; }
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
}
.blob-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--brand), transparent);
  top: -150px; left: -150px;
  animation: float 14s ease-in-out infinite;
}
.blob-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--brand-2), transparent);
  bottom: -150px; right: -150px;
  animation: float 18s ease-in-out infinite reverse;
}
.grid-pattern {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  opacity: 0.3;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(30px, -40px) scale(1.1); }
}

.hero-grid {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 18px 9px 14px;
  background:
    linear-gradient(var(--bg-elev), var(--bg-elev)) padding-box,
    linear-gradient(135deg, var(--c-purple) 0%, var(--c-cyan) 50%, var(--c-teal) 100%) border-box;
  border: 1.5px solid transparent;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 22px;
  box-shadow:
    0 1px 2px rgba(64, 0, 165, 0.05),
    0 8px 24px -8px rgba(64, 0, 165, 0.18);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: transform var(--transition), box-shadow var(--transition);
  letter-spacing: -0.005em;
  overflow: hidden;
}
.hero-tag::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg,
    rgba(64, 0, 165, 0.06) 0%,
    rgba(0, 194, 255, 0.04) 50%,
    rgba(45, 212, 191, 0.06) 100%);
  pointer-events: none;
  z-index: 0;
}
.hero-tag:hover {
  transform: translateY(-2px);
  box-shadow:
    0 2px 4px rgba(64, 0, 165, 0.08),
    0 14px 34px -8px rgba(64, 0, 165, 0.28);
}
.hero-tag > * { position: relative; z-index: 1; }
.hero-tag .dot {
  position: relative;
  width: 9px; height: 9px;
  background: #10b981;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.22);
}
.hero-tag .dot::before,
.hero-tag .dot::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: #10b981;
  opacity: 0.55;
  animation: ping 2.4s cubic-bezier(0, 0, 0.2, 1) infinite;
}
.hero-tag .dot::after {
  animation-delay: 1.2s;
}
@keyframes ping {
  0% { transform: scale(1); opacity: 0.55; }
  80%, 100% { transform: scale(2.6); opacity: 0; }
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.hero-title span { display: block; }
.gradient-text {
  background: linear-gradient(135deg, var(--brand), var(--brand-2), var(--brand-3));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 22px;
  min-height: 2em;
}
.cursor { color: var(--brand); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-bio {
  color: var(--text-muted);
  font-size: 1.02rem;
  margin-bottom: 28px;
  max-width: 620px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 26px;
  align-items: center;
}

.cta-separator {
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--text-secondary, #888);
  user-select: none;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  color: white;
  box-shadow: 0 8px 20px -8px var(--brand);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px -8px var(--brand); }
.btn-outline {
  background: var(--bg-elev);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-outline:hover { border-color: var(--brand); color: var(--brand); transform: translateY(-2px); }
.btn-sm { padding: 6px 14px; font-size: 0.78rem; gap: 5px; }

.hero-socials { display: flex; gap: 10px; }
.hero-socials a {
  width: 42px; height: 42px;
  display: grid; place-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.hero-socials a:hover { color: white; background: var(--brand); border-color: var(--brand); transform: translateY(-3px); }

/* Avatar */
.hero-visual { display: grid; place-items: center; }
.avatar-wrap {
  position: relative;
  width: min(360px, 80vw);
  aspect-ratio: 1;
}
.avatar-ring {
  position: absolute; inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--brand), var(--brand-2), var(--brand-3), var(--brand));
  animation: spin 12s linear infinite;
  padding: 4px;
}
.avatar-ring::before {
  content: '';
  position: absolute; inset: 4px;
  background: var(--bg);
  border-radius: 50%;
}
@keyframes spin { to { transform: rotate(360deg); } }

.avatar {
  position: absolute;
  inset: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  display: grid; place-items: center;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.avatar-initials {
  font-size: 6rem;
  font-weight: 800;
  color: white;
  letter-spacing: -2px;
}
.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
}
.avatar-svg {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: block;
}

.float-chip {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  box-shadow: var(--shadow-md);
  animation: floaty 6s ease-in-out infinite;
}
.float-chip i { color: var(--brand); }
.chip-1 { top: 4%; left: -12%; animation-delay: 0s; }
.chip-2 { top: 20%; right: -14%; animation-delay: 1.5s; }
.chip-3 { bottom: 18%; left: -18%; animation-delay: 3s; }
.chip-4 { bottom: 2%; right: -10%; animation-delay: 4.5s; }
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* Stats */
.stats {
  margin-top: 70px;
  padding: 28px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  box-shadow: var(--shadow-md);
}
.stat {
  min-width: 0;
  overflow: hidden;
}
.stat { text-align: center; }
.stat-num {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
  margin-bottom: 4px;
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  letter-spacing: -0.01em;
  display: inline-block;
  text-align: center;
}
.stat-label { font-size: 13px; color: var(--text-muted); font-weight: 500; }

/* Sections */
.section { padding: 100px 0; }
.section.alt { background: var(--bg-soft); }

.section-head { text-align: center; margin-bottom: 56px; max-width: 720px; margin-inline: auto; }
.section-kicker {
  display: inline-block;
  color: var(--brand);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.section-sub { color: var(--text-muted); font-size: 1.02rem; }

.sub-title {
  font-size: 1.25rem;
  margin: 42px 0 20px;
  font-weight: 700;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 40px;
  align-items: start;
}
.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 1.02rem;
}
.about-grid-inner {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.about-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  transition: all var(--transition);
}
.about-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
}
.about-card i {
  color: var(--brand);
  font-size: 1.6rem;
  margin-bottom: 8px;
}
.about-card h4 { margin-bottom: 4px; font-size: 1rem; }
.about-card p { color: var(--text-muted); font-size: 14px; margin: 0; }

.about-side { position: sticky; top: calc(var(--nav-h) + 20px); }
.info-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.info-card h4 { margin-bottom: 14px; font-size: 1rem; }
.info-list { list-style: none; display: grid; gap: 10px; margin-bottom: 18px; }
.info-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 14px;
}
.info-list i { color: var(--brand); width: 18px; }
.info-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.info-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-soft);
  border-radius: 999px;
  font-size: 12.5px;
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.info-links a:hover { color: var(--brand); border-color: var(--brand); }

/* Tabs */
.tabs {
  display: inline-flex;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 30px;
  gap: 2px;
  flex-wrap: wrap;
}
.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 14px;
  border-radius: 9px;
  cursor: pointer;
  transition: all var(--transition);
  font-family: inherit;
}
.tab-btn i { font-size: 13px; }
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: white;
  box-shadow: var(--shadow-sm);
}
.tab-panel { display: none; animation: fadeIn 0.4s ease; }
.tab-panel.active { display: block; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* Timeline */
.timeline { position: relative; padding-inline-start: 30px; }
.timeline::before {
  content: '';
  position: absolute;
  top: 8px; bottom: 8px;
  inset-inline-start: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--brand), var(--brand-2));
  border-radius: 2px;
}
.tl-item { position: relative; padding-bottom: 30px; }
.tl-dot {
  position: absolute;
  inset-inline-start: -27px;
  top: 8px;
  width: 16px; height: 16px;
  background: var(--bg);
  border: 3px solid var(--brand);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--bg);
}
.tl-content {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  transition: all var(--transition);
}
.tl-content:hover { border-color: var(--brand); box-shadow: var(--shadow-md); }
.tl-date {
  display: inline-block;
  color: var(--brand);
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 4px;
}
.tl-content h3 { font-size: 1.1rem; margin-bottom: 2px; }
.tl-org {
  display: block;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 10px;
  font-weight: 500;
}
a.tl-org:hover { color: var(--brand); }
.tl-content ul { padding-inline-start: 20px; }
.tl-content li { color: var(--text-muted); font-size: 14px; margin-bottom: 4px; }

/* Education grid */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
}
.edu-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: all var(--transition);
}
.edu-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand);
  box-shadow: var(--shadow-md);
}
.edu-year {
  display: inline-block;
  color: var(--brand);
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 8px;
}
.edu-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.edu-degree { color: var(--text); font-size: 14px; font-weight: 500; margin-bottom: 2px; }
.edu-dept { color: var(--text-muted); font-size: 13px; }

/* Publications */
.pub-group-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.2rem;
  font-weight: 700;
  margin: 38px 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.pub-group-title:first-of-type { margin-top: 12px; }
.pub-group-title > i { color: var(--brand); font-size: 1.2rem; }
.pub-group-title .pub-count {
  margin-inline-start: auto;
  padding: 3px 12px;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: white;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.pub-groups { display: grid; gap: 14px; }

.pub-group {
  display: grid;
  grid-template-columns: 100px 1fr;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.pub-group:hover { box-shadow: var(--shadow-md); border-color: var(--border-strong); }

.pub-group .pub-year {
  padding: 22px 18px;
  background: linear-gradient(135deg, rgba(64,0,165,0.08), rgba(0,194,255,0.06));
  border-inline-end: 1px solid var(--border);
  color: var(--brand);
  font-weight: 800;
  font-size: 1.3rem;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  line-height: 1;
}
[data-theme='dark'] .pub-group .pub-year {
  background: linear-gradient(135deg, rgba(64,0,165,0.25), rgba(0,194,255,0.15));
}

.pub-items { display: flex; flex-direction: column; }

.pub-item {
  display: block;
  padding: 16px 22px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  transition: background var(--transition);
  position: relative;
}
.pub-item:last-child { border-bottom: none; }
.pub-item:hover { background: var(--bg-soft); }
.pub-item:hover h4 { color: var(--brand); }
.pub-item:hover .pub-ext { opacity: 1; transform: translate(2px, -2px); }

.pub-item h4 {
  font-size: 1rem;
  margin-bottom: 6px;
  line-height: 1.45;
  color: var(--text);
  transition: color var(--transition);
}
.pub-ext {
  font-size: 11px;
  color: var(--text-soft);
  margin-inline-start: 6px;
  opacity: 0.5;
  transition: all var(--transition);
  vertical-align: middle;
}
.pub-authors { color: var(--text-muted); font-size: 13.5px; margin-bottom: 2px; }
.pub-venue { color: var(--text-soft); font-size: 13px; }

/* Color-rotate pub-year accent per group */
.pub-groups .pub-group:nth-child(3n+1) .pub-year { color: var(--c-purple); }
.pub-groups .pub-group:nth-child(3n+2) .pub-year { color: var(--c-cyan); }
.pub-groups .pub-group:nth-child(3n+3) .pub-year { color: var(--c-teal); }

/* RTL — flip divider side */
html[dir='rtl'] .pub-group .pub-year {
  border-inline-end: none;
  border-inline-start: 1px solid var(--border);
}

/* Mobile — stack year on top */
@media (max-width: 560px) {
  .pub-group { grid-template-columns: 1fr; }
  .pub-group .pub-year {
    padding: 12px 18px;
    border-inline-end: none;
    border-bottom: 1px solid var(--border);
    justify-content: flex-start;
  }
  html[dir='rtl'] .pub-group .pub-year {
    border-inline-start: none;
    border-bottom: 1px solid var(--border);
  }
}

.pub-cta { margin-top: 36px; text-align: center; }

/* Color-rotate group title icons */
.pub-group-title:nth-of-type(1) > i { color: var(--c-purple); }
.pub-group-title:nth-of-type(2) > i { color: var(--c-cyan); }
.pub-group-title:nth-of-type(3) > i { color: var(--c-teal); }

/* Teaching chips */
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--text);
  transition: all var(--transition);
}
.chip i { color: var(--brand); font-size: 13px; }
.chip:hover {
  border-color: var(--brand);
  color: var(--brand);
  transform: translateY(-2px);
}

/* Training */
.training-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}
.train-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  transition: all var(--transition);
}
.train-card i {
  font-size: 1.5rem;
  color: var(--brand);
  margin-bottom: 8px;
}
.train-card h4 { font-size: 0.98rem; margin-bottom: 4px; }
.train-card span { color: var(--text-muted); font-size: 13px; }
.train-card:hover {
  border-color: var(--brand);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin-bottom: 30px;
}
.skill-group {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.skill-group h4 {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  margin-bottom: 14px;
}
.skill-group h4 i { color: var(--brand); }
.skill-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
}
.skill-chip i { color: var(--brand); }
a.skill-chip-link { text-decoration: none; color: inherit; cursor: pointer; }
a.skill-chip-link:hover { border-color: var(--brand); box-shadow: 0 0 8px rgba(0,194,255,0.3); }

/* Certifications */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
}
.cert-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
  color: var(--text);
}
.cert-card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.cert-badge {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  border-radius: 10px;
  color: white;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.cert-card h4 { font-size: 0.96rem; margin-bottom: 2px; }
.cert-card span { color: var(--text-muted); font-size: 13px; }
.cert-arrow { color: var(--text-muted); font-size: 12px; margin-inline-start: auto; }

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
}
.project-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--brand-3));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.project-card:hover::before { transform: scaleX(1); }
.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--brand);
  box-shadow: var(--shadow-lg);
}
.project-icon {
  width: 50px; height: 50px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(124, 58, 237, 0.12));
  border-radius: 12px;
  color: var(--brand);
  font-size: 1.4rem;
  margin-bottom: 14px;
}
.project-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.project-card > p {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 14px;
}
.project-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.project-tags span {
  padding: 3px 10px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 11.5px;
  color: var(--text-muted);
  font-weight: 500;
}

/* CV viewer */
.cv-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}
.cv-viewer {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  aspect-ratio: 1 / 1.414;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  background: var(--bg-elev);
}
.cv-viewer iframe {
  position: relative;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  z-index: 2;
  background: #fff;
}
.cv-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 30px;
  text-align: center;
  color: var(--text-muted);
  z-index: 1;
}
.cv-fallback i {
  font-size: 3rem;
  color: var(--c-purple);
}
.cv-fallback p { max-width: 360px; font-size: 14px; }

@media (max-width: 700px) {
  .cv-viewer {
    aspect-ratio: auto;
    height: 75vh;
    min-height: 500px;
  }
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  transition: all var(--transition);
}
.contact-card > i {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  border-radius: 12px;
  color: white;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.contact-card h4 { font-size: 0.95rem; margin-bottom: 2px; }
.contact-card span { color: var(--text-muted); font-size: 13px; word-break: break-word; }
.contact-card:hover {
  border-color: var(--brand);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

/* Footer */
.footer {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  padding: 36px 0 24px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
}
.footer-inner strong { display: block; font-size: 15px; }
.footer-inner p { color: var(--text-muted); font-size: 13px; margin: 2px 0 0; }
.footer-socials { display: flex; gap: 8px; justify-content: center; }
.footer-socials a {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-muted);
  transition: all var(--transition);
}
.footer-socials a:hover { color: white; background: var(--brand); border-color: var(--brand); }
.copyright {
  color: var(--text-muted);
  font-size: 12.5px;
  text-align: end;
}
html[dir='rtl'] .copyright { text-align: start; }

/* Back to top */
.to-top {
  position: fixed;
  bottom: 30px;
  inset-inline-end: 30px;
  width: 46px; height: 46px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 800;
}
.to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.to-top:hover { transform: translateY(-4px) scale(1.05); }

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.in { opacity: 1; transform: none; }

/* ============================================================
   Colorful icon rotation — give icons personality
   ============================================================ */

/* Teaching chips — rotate through palette */
.chip-grid .chip:nth-child(8n+1) i { color: var(--c-purple); }
.chip-grid .chip:nth-child(8n+2) i { color: var(--c-cyan); }
.chip-grid .chip:nth-child(8n+3) i { color: var(--c-teal); }
.chip-grid .chip:nth-child(8n+4) i { color: var(--c-amber); }
.chip-grid .chip:nth-child(8n+5) i { color: var(--c-pink); }
.chip-grid .chip:nth-child(8n+6) i { color: var(--c-green); }
.chip-grid .chip:nth-child(8n+7) i { color: var(--c-indigo); }
.chip-grid .chip:nth-child(8n+8) i { color: var(--c-rose); }

/* Faculty training cards — gradient icons */
.training-grid .train-card:nth-child(8n+1) i { color: var(--c-purple); }
.training-grid .train-card:nth-child(8n+2) i { color: var(--c-cyan); }
.training-grid .train-card:nth-child(8n+3) i { color: var(--c-teal); }
.training-grid .train-card:nth-child(8n+4) i { color: var(--c-amber); }
.training-grid .train-card:nth-child(8n+5) i { color: var(--c-pink); }
.training-grid .train-card:nth-child(8n+6) i { color: var(--c-green); }
.training-grid .train-card:nth-child(8n+7) i { color: var(--c-indigo); }
.training-grid .train-card:nth-child(8n+8) i { color: var(--c-rose); }

/* About cards */
.about-grid-inner .about-card:nth-child(1) i { color: var(--c-purple); }
.about-grid-inner .about-card:nth-child(2) i { color: var(--c-cyan); }
.about-grid-inner .about-card:nth-child(3) i { color: var(--c-teal); }
.about-grid-inner .about-card:nth-child(4) i { color: var(--c-amber); }

/* Skill group headers */
.skills-grid .skill-group:nth-child(1) h4 i { color: var(--c-purple); }
.skills-grid .skill-group:nth-child(2) h4 i { color: var(--c-cyan); }
.skills-grid .skill-group:nth-child(3) h4 i { color: var(--c-teal); }
.skills-grid .skill-group:nth-child(4) h4 i { color: var(--c-amber); }

/* Skill chips — per-item icon colors */
.skill-chips .skill-chip:nth-child(6n+1) i { color: var(--c-purple); }
.skill-chips .skill-chip:nth-child(6n+2) i { color: var(--c-cyan); }
.skill-chips .skill-chip:nth-child(6n+3) i { color: var(--c-teal); }
.skill-chips .skill-chip:nth-child(6n+4) i { color: var(--c-amber); }
.skill-chips .skill-chip:nth-child(6n+5) i { color: var(--c-pink); }
.skill-chips .skill-chip:nth-child(6n+6) i { color: var(--c-green); }

/* Info list inside about side */
.info-list li:nth-child(1) i { color: var(--c-purple); }
.info-list li:nth-child(2) i { color: var(--c-cyan); }
.info-list li:nth-child(3) i { color: var(--c-teal); }
.info-list li:nth-child(4) i { color: var(--c-amber); }

/* Hero social icons — colorful at rest, white on hover */
.hero-socials a:nth-child(1):not(:hover) { color: var(--c-purple); }
.hero-socials a:nth-child(2):not(:hover) { color: var(--c-cyan); }
.hero-socials a:nth-child(3):not(:hover) { color: var(--c-teal); }
.hero-socials a:nth-child(4):not(:hover) { color: var(--c-amber); }
.hero-socials a:nth-child(5):not(:hover) { color: var(--c-pink); }
.hero-socials a:hover { color: #fff !important; }

/* Footer social icons — colorful tiles */
.footer-socials a:nth-child(1):not(:hover) {
  color: #fff;
  background: linear-gradient(135deg, var(--c-purple), var(--c-cyan));
  border-color: transparent;
}
.footer-socials a:nth-child(2):not(:hover) {
  color: #fff;
  background: linear-gradient(135deg, #0A66C2, #00C2FF);
  border-color: transparent;
}
.footer-socials a:nth-child(3):not(:hover) {
  color: #fff;
  background: linear-gradient(135deg, var(--c-pink), var(--c-rose));
  border-color: transparent;
}
.footer-socials a:hover {
  color: #fff !important;
  background: var(--brand-dark) !important;
  border-color: var(--brand-dark) !important;
  transform: translateY(-3px);
}

/* Floating chips around avatar */
.float-chip.chip-1 i { color: var(--c-purple); }
.float-chip.chip-2 i { color: var(--c-cyan); }
.float-chip.chip-3 i { color: var(--c-amber); }
.float-chip.chip-4 i { color: var(--c-indigo); }

/* Project icon tiles — gradient backgrounds per card */
.projects-grid .project-card:nth-child(6n+1) .project-icon {
  background: linear-gradient(135deg, rgba(64,0,165,0.15), rgba(0,194,255,0.12));
  color: var(--c-purple);
}
.projects-grid .project-card:nth-child(6n+2) .project-icon {
  background: linear-gradient(135deg, rgba(0,194,255,0.18), rgba(45,212,191,0.14));
  color: var(--c-cyan);
}
.projects-grid .project-card:nth-child(6n+3) .project-icon {
  background: linear-gradient(135deg, rgba(45,212,191,0.18), rgba(16,185,129,0.14));
  color: var(--c-teal);
}
.projects-grid .project-card:nth-child(6n+4) .project-icon {
  background: linear-gradient(135deg, rgba(245,158,11,0.18), rgba(244,63,94,0.14));
  color: var(--c-amber);
}
.projects-grid .project-card:nth-child(6n+5) .project-icon {
  background: linear-gradient(135deg, rgba(236,72,153,0.18), rgba(99,102,241,0.14));
  color: var(--c-pink);
}
.projects-grid .project-card:nth-child(6n+6) .project-icon {
  background: linear-gradient(135deg, rgba(16,185,129,0.18), rgba(0,194,255,0.14));
  color: var(--c-green);
}

/* Certification badges — rotating gradient */
.cert-grid .cert-card:nth-child(6n+1) .cert-badge { background: linear-gradient(135deg, var(--c-purple), var(--c-cyan)); }
.cert-grid .cert-card:nth-child(6n+2) .cert-badge { background: linear-gradient(135deg, var(--c-cyan), var(--c-teal)); }
.cert-grid .cert-card:nth-child(6n+3) .cert-badge { background: linear-gradient(135deg, var(--c-teal), var(--c-green)); }
.cert-grid .cert-card:nth-child(6n+4) .cert-badge { background: linear-gradient(135deg, var(--c-amber), var(--c-rose)); }
.cert-grid .cert-card:nth-child(6n+5) .cert-badge { background: linear-gradient(135deg, var(--c-pink), var(--c-indigo)); }
.cert-grid .cert-card:nth-child(6n+6) .cert-badge { background: linear-gradient(135deg, var(--c-indigo), var(--c-purple)); }

/* Contact card icons */
.contact-grid .contact-card:nth-child(6n+1) > i { background: linear-gradient(135deg, var(--c-purple), var(--c-cyan)); }
.contact-grid .contact-card:nth-child(6n+2) > i { background: linear-gradient(135deg, var(--c-cyan), var(--c-teal)); }
.contact-grid .contact-card:nth-child(6n+3) > i { background: linear-gradient(135deg, var(--c-teal), var(--c-green)); }
.contact-grid .contact-card:nth-child(6n+4) > i { background: linear-gradient(135deg, var(--c-amber), var(--c-rose)); }
.contact-grid .contact-card:nth-child(6n+5) > i { background: linear-gradient(135deg, var(--c-pink), var(--c-indigo)); }
.contact-grid .contact-card:nth-child(6n+6) > i { background: linear-gradient(135deg, var(--c-indigo), var(--c-purple)); }

/* Timeline dots — colorful per entry */
.timeline .tl-item:nth-child(7n+1) .tl-dot { border-color: var(--c-purple); }
.timeline .tl-item:nth-child(7n+2) .tl-dot { border-color: var(--c-cyan); }
.timeline .tl-item:nth-child(7n+3) .tl-dot { border-color: var(--c-teal); }
.timeline .tl-item:nth-child(7n+4) .tl-dot { border-color: var(--c-amber); }
.timeline .tl-item:nth-child(7n+5) .tl-dot { border-color: var(--c-pink); }
.timeline .tl-item:nth-child(7n+6) .tl-dot { border-color: var(--c-indigo); }
.timeline .tl-item:nth-child(7n+7) .tl-dot { border-color: var(--c-green); }

/* Edu card year pill colors */
.edu-grid .edu-card:nth-child(3n+1) .edu-year { color: var(--c-purple); }
.edu-grid .edu-card:nth-child(3n+2) .edu-year { color: var(--c-cyan); }
.edu-grid .edu-card:nth-child(3n+3) .edu-year { color: var(--c-teal); }

/* Hover: icon chips lift with their own color */
.chip:hover, .skill-chip:hover {
  transform: translateY(-2px);
}

/* RTL tweaks */
html[dir='rtl'] .tl-content ul { padding-inline-start: 0; padding-inline-end: 20px; }
html[dir='rtl'] .pub-year { border-inline-end: none; border-inline-start: 2px solid var(--border); }
html[dir='rtl'] .typewriter { text-align: right; }

/* Responsive */
@media (max-width: 980px) {
  .nav-links {
    display: none;
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    flex-direction: column;
    padding: 16px;
    background: var(--bg-elev);
    border: none;
    border-radius: 0;
    border-bottom: 1px solid var(--border);
    gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 16px; width: 100%; border-radius: 10px; text-align: start; }
  .nav-links a.active { border-radius: 10px; }
  .menu-btn { display: inline-flex; }
  .logo-role { display: none; }
  .logo-name { font-size: 14px; }

  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .hero-text .hero-tag, .hero-cta, .hero-socials { justify-content: center; }
  .avatar-wrap { width: min(300px, 70vw); }
  .chip-1 { left: -8%; }
  .chip-2 { right: -8%; }
  .chip-3 { left: -10%; }
  .chip-4 { right: -6%; }

  .about-grid { grid-template-columns: 1fr; }
  .about-side { position: static; }

  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .footer-inner { grid-template-columns: 1fr; text-align: center; }
  .copyright { text-align: center; }
}

@media (max-width: 560px) {
  .section { padding: 70px 0; }
  .stats { padding: 20px; gap: 16px; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .cta-separator { display: none; }
  .btn { justify-content: center; }
  .pub { grid-template-columns: 70px 1fr; }
  .about-grid-inner { grid-template-columns: 1fr; }
  .logo-text { display: none; }
}