/* ============================================================
   Mahmoud Alyosify — Premium AI Engineer Portfolio
   Modern CSS Design System 2026
   ============================================================ */

/* ── Google Fonts ────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Design Tokens ───────────────────────────────────────── */
:root {
  /* Colors */
  --bg-primary:    #080b12;
  --bg-secondary:  #0d1117;
  --bg-card:       #0f1623;
  --bg-card-hover: #131d2e;
  --border:        rgba(255,255,255,0.07);
  --border-hover:  rgba(6,182,212,0.35);

  --text-primary:  #f0f4f8;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;

  --accent-cyan:   #06b6d4;
  --accent-violet: #8b5cf6;
  --accent-green:  #10b981;
  --accent-amber:  #f59e0b;
  --accent-red:    #ef4444;

  --gradient-hero: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 100%);
  --gradient-card: linear-gradient(145deg, #0f1623 0%, #131d2e 100%);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --section-py: 120px;
  --container-max: 1200px;
  --container-px: 24px;

  /* Transitions */
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.6);
  --glow-cyan:  0 0 30px rgba(6,182,212,0.15);
  --glow-violet: 0 0 30px rgba(139,92,246,0.15);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

/* ── Reset & Base ────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: #22d3ee; }
ul { list-style: none; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

/* ── Container ───────────────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-px);
}

/* ── Section Base ────────────────────────────────────────── */
.section {
  padding: var(--section-py) 0;
  position: relative;
}
.section--alt { background-color: var(--bg-secondary); }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 16px;
}
.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 1px;
  background: var(--accent-cyan);
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.section-title span { 
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: var(--gradient-hero);
  color: #fff;
  box-shadow: var(--glow-cyan);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(6,182,212,0.35);
  color: #fff;
}
.btn-outline {
  border: 1px solid var(--border-hover);
  color: var(--text-primary);
  background: transparent;
}
.btn-outline:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6,182,212,0.08);
  transform: translateY(-2px);
}
.btn-sm {
  padding: 8px 18px;
  font-size: 0.8rem;
}

/* ── Badge / Tag ─────────────────────────────────────────── */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 0.72rem;
  font-weight: 500;
  border-radius: var(--radius-full);
  background: rgba(6,182,212,0.1);
  color: var(--accent-cyan);
  border: 1px solid rgba(6,182,212,0.2);
  font-family: var(--font-mono);
}
.tag--violet {
  background: rgba(139,92,246,0.1);
  color: var(--accent-violet);
  border-color: rgba(139,92,246,0.2);
}
.tag--green {
  background: rgba(16,185,129,0.1);
  color: var(--accent-green);
  border-color: rgba(16,185,129,0.2);
}
.tag--amber {
  background: rgba(245,158,11,0.1);
  color: var(--accent-amber);
  border-color: rgba(245,158,11,0.2);
}

/* ── Scroll Animations ───────────────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up:nth-child(1) { transition-delay: 0ms; }
.fade-up:nth-child(2) { transition-delay: 80ms; }
.fade-up:nth-child(3) { transition-delay: 160ms; }
.fade-up:nth-child(4) { transition-delay: 240ms; }
.fade-up:nth-child(5) { transition-delay: 320ms; }
.fade-up:nth-child(6) { transition-delay: 400ms; }

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: all var(--transition);
}
.nav.scrolled {
  background: rgba(8,11,18,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.nav__logo span {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}
.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent-cyan);
  transition: width var(--transition);
}
.nav__links a:hover,
.nav__links a.active { color: var(--text-primary); }
.nav__links a:hover::after,
.nav__links a.active::after { width: 100%; }

.nav__cta {
  padding: 8px 20px;
  font-size: 0.85rem;
}
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile nav */
@media (max-width: 900px) {
  .nav__links, .nav__cta { display: none; }
  .nav__hamburger { display: flex; }
  .nav.open .nav__links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 20px 24px 28px;
    gap: 20px;
    align-items: flex-start;
  }
  .nav.open .nav__cta {
    display: inline-flex;
    margin: 0 24px 24px;
  }
  .nav.open .nav__hamburger span:nth-child(1) { transform: rotate(45deg) translateY(7px); }
  .nav.open .nav__hamburger span:nth-child(2) { opacity: 0; }
  .nav.open .nav__hamburger span:nth-child(3) { transform: rotate(-45deg) translateY(-7px); }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}
/* Animated grid background */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(6,182,212,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6,182,212,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, #000 40%, transparent 100%);
}
/* Glow orbs */
.hero__glow-1 {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,0.08) 0%, transparent 70%);
  top: -100px; left: -100px;
  pointer-events: none;
}
.hero__glow-2 {
  position: absolute;
  width: 500px; height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(139,92,246,0.08) 0%, transparent 70%);
  bottom: -50px; right: -50px;
  pointer-events: none;
}
.hero__content {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: center;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 8px;
  background: rgba(6,182,212,0.08);
  border: 1px solid rgba(6,182,212,0.2);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-bottom: 24px;
}
.hero__badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 8px var(--accent-cyan);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}
.hero__name {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.hero__title {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.5;
}
.hero__title strong {
  color: var(--accent-cyan);
  font-weight: 600;
}
.hero__summary {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 540px;
  margin-bottom: 36px;
}
.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero__stats {
  display: flex;
  gap: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.hero__stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 4px;
  font-weight: 500;
}
/* Profile image */
.hero__photo-wrap {
  position: relative;
  flex-shrink: 0;
}
.hero__photo-ring {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: var(--gradient-hero);
  padding: 3px;
}
.hero__photo-ring::before {
  content: '';
  display: block;
  inset: 0;
  border-radius: 50%;
  background: var(--bg-primary);
}
.hero__photo {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  position: relative;
  z-index: 1;
  border: 3px solid var(--bg-primary);
}
.hero__social {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.hero__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1rem;
  transition: all var(--transition);
}
.hero__social a:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6,182,212,0.08);
  transform: translateY(-3px);
}

@media (max-width: 900px) {
  .hero__content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero__photo-wrap { order: -1; margin: 0 auto; }
  .hero__photo { width: 200px; height: 200px; }
  .hero__name { text-align: center; }
  .hero__title { text-align: center; }
  .hero__summary { text-align: center; margin: 0 auto 36px; }
  .hero__actions { justify-content: center; }
  .hero__stats { justify-content: center; gap: 28px; }
  .hero__badge { margin: 0 auto 24px; display: flex; width: fit-content; }
  .hero__social { justify-content: center; }
}
@media (max-width: 480px) {
  .hero__stats { gap: 20px; }
  .hero__stat-number { font-size: 1.5rem; }
}

/* ============================================================
   ABOUT
   ============================================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.about__text p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
  font-size: 1.0rem;
}
.about__text p strong {
  color: var(--text-primary);
  font-weight: 600;
}
.about__highlight {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: rgba(6,182,212,0.06);
  border: 1px solid rgba(6,182,212,0.15);
  border-radius: var(--radius-md);
  margin-top: 8px;
  margin-bottom: 24px;
}
.about__highlight-icon { font-size: 1.3rem; }
.about__highlight-text { font-size: 0.9rem; color: var(--text-secondary); }
.about__highlight-text strong { color: var(--accent-cyan); font-weight: 600; }

.about__facts {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.about__fact {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.about__fact:last-child { border-bottom: none; }
.about__fact-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  color: var(--accent-cyan);
}
.about__fact-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2px;
}
.about__fact-value {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
}
.about__fact-value a { color: var(--accent-cyan); }
.about__fact-value a:hover { text-decoration: underline; }

@media (max-width: 768px) {
  .about__grid { grid-template-columns: 1fr; gap: 48px; }
}

/* ============================================================
   SKILLS
   ============================================================ */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.skill-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}
.skill-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.skill-card__header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.skill-card__icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.skill-card__icon--cyan { background: rgba(6,182,212,0.12); }
.skill-card__icon--violet { background: rgba(139,92,246,0.12); }
.skill-card__icon--green { background: rgba(16,185,129,0.12); }
.skill-card__icon--amber { background: rgba(245,158,11,0.12); }

.skill-card__title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}
.skill-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ============================================================
   EXPERIENCE / TIMELINE
   ============================================================ */
.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-cyan), var(--accent-violet), transparent);
}
.timeline__item {
  position: relative;
  padding-bottom: 40px;
}
.timeline__item:last-child { padding-bottom: 0; }
.timeline__dot {
  position: absolute;
  left: -38px;
  top: 4px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent-cyan);
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 10px rgba(6,182,212,0.5);
}
.timeline__item:nth-child(even) .timeline__dot {
  background: var(--accent-violet);
  box-shadow: 0 0 10px rgba(139,92,246,0.5);
}
.timeline__date {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}
.timeline__role {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.timeline__org {
  font-size: 0.9rem;
  color: var(--accent-cyan);
  font-weight: 500;
  margin-bottom: 10px;
}
.timeline__org a { color: inherit; }
.timeline__org a:hover { text-decoration: underline; }
.timeline__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.timeline__desc li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 6px;
}
.timeline__desc li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-size: 0.8rem;
}

/* ============================================================
   EDUCATION
   ============================================================ */
.education__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}
.edu-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.edu-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gradient-hero);
}
.edu-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.edu-card__institution {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.edu-card__degree {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.3;
}
.edu-card__meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-mono);
}
.edu-card__detail {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.edu-card__detail li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 6px;
}
.edu-card__detail li::before {
  content: '·';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: bold;
}
.edu-card__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-amber);
  margin-top: 12px;
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.project-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.project-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-hero);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
  border-radius: inherit;
}
.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.project-card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}
.project-card__emoji {
  font-size: 2rem;
  line-height: 1;
}
.project-card__links {
  display: flex;
  gap: 8px;
}
.project-card__link {
  width: 34px; height: 34px;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: all var(--transition);
}
.project-card__link:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.project-card__name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.3;
}
.project-card__period {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 12px;
}
.project-card__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 20px;
}
.project-card__desc li {
  position: relative;
  padding-left: 14px;
  margin-bottom: 5px;
}
.project-card__desc li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: bold;
}
.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

/* ============================================================
   TEACHING
   ============================================================ */
.teaching__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}
.teaching-platform {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: all var(--transition);
}
.teaching-platform:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.teaching-platform__icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}
.teaching-platform__stat {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 4px;
}
.teaching-platform__label {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
}
.teaching-platform__name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.teaching-platform__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.courses__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.course-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}
.course-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}
.course-card__img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}
.course-card__body {
  padding: 20px;
}
.course-card__title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}
.course-card__links {
  display: flex;
  gap: 8px;
}

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

/* ============================================================
   ACHIEVEMENTS
   ============================================================ */
.achievements__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.achievement-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  align-items: flex-start;
  gap: 18px;
  transition: all var(--transition);
}
.achievement-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.achievement-card__icon {
  font-size: 2rem;
  line-height: 1;
  flex-shrink: 0;
}
.achievement-card__title {
  font-size: 0.97rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.3;
}
.achievement-card__subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
  font-family: var(--font-mono);
}
.achievement-card__desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.achievement-card__links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* ============================================================
   RECOMMENDATIONS
   ============================================================ */
.recommendations__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.rec-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  transition: all var(--transition);
}
.rec-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.rec-card__quote-icon {
  font-size: 2rem;
  color: var(--accent-cyan);
  opacity: 0.4;
  margin-bottom: 16px;
  line-height: 1;
}
.rec-card__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  font-style: italic;
}
.rec-card__author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.rec-card__avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-hover);
  flex-shrink: 0;
}
.rec-card__name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.rec-card__role {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ============================================================
   CERTIFICATIONS
   ============================================================ */
.certs__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}
.cert-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.cert-item:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.cert-item__thumb {
  width: 100%;
  height: 160px;
  object-fit: cover;
  transition: transform var(--transition);
  background: var(--bg-secondary);
}
.cert-item:hover .cert-item__thumb {
  transform: scale(1.04);
}
.cert-item__body {
  padding: 16px;
}
.cert-item__name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  line-height: 1.3;
}
.cert-item__issuer {
  font-size: 0.75rem;
  color: var(--accent-cyan);
  font-weight: 500;
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact__inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}
.contact__email {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  padding: 16px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  margin: 32px 0;
  transition: all var(--transition);
}
.contact__email:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-2px);
  box-shadow: var(--glow-cyan);
}
.contact__social {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 32px;
}
.contact__social-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.contact__social-link:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(6,182,212,0.08);
  transform: translateY(-2px);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 40px 0;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer__logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}
.footer__logo span {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer__copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer__links {
  display: flex;
  gap: 20px;
}
.footer__links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--accent-cyan); }

@media (max-width: 600px) {
  .footer__inner { flex-direction: column; align-items: center; text-align: center; }
}

/* ============================================================
   BACK TO TOP
   ============================================================ */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px; height: 44px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
}
.back-to-top:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-3px);
}

/* ============================================================
   LIGHTBOX OVERLAY
   ============================================================ */
.lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}
.lightbox-overlay.open {
  display: flex;
}
.lightbox-overlay img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--radius-md);
  object-fit: contain;
}
.lightbox-close {
  position: absolute;
  top: 20px; right: 24px;
  font-size: 2rem;
  color: white;
  cursor: pointer;
  line-height: 1;
}

/* ============================================================
   UTILITIES
   ============================================================ */
.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}
.mt-8  { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }
.flex  { display: flex; }
.items-center { align-items: center; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.flex-wrap { flex-wrap: wrap; }
.hidden { display: none; }

/* ── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-cyan); }

/* ── Selection ───────────────────────────────────────────── */
::selection { background: rgba(6,182,212,0.25); color: var(--text-primary); }