/* ============================================================
   AL MAHDY CHEMISTRY — PREMIUM CSS
   ============================================================ */

/* --------- RESET & BASE --------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:   #2563EB;
  --cyan:   #06B6D4;
  --green:  #10B981;
  --violet: #8B5CF6;
  --amber:  #F59E0B;
  --orange: #F97316;
  --red:    #EF4444;
  --watermelon: #FF6B8B;
  --bg:     #020508;
  --card:   rgba(255, 255, 255, 0.55);
  --text:   #0F172A;
  --text-s: #475569;
  --border: rgba(148,163,184,0.15);
  --glass:  rgba(255,255,255,0.45);
  --glass-border: rgba(255,255,255,0.6);
  --shadow: 0 8px 32px rgba(37,99,235,0.06);
  --shadow-lg: 0 24px 64px rgba(37,99,235,0.12);
  --radius-card: 24px;
  --radius-btn: 14px;
  --transition: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --font: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  
  /* Grad helper sets */
  --grad-blue: linear-gradient(135deg, var(--blue), var(--cyan));
  --grad-green: linear-gradient(135deg, var(--green), var(--cyan));
  --grad-violet: linear-gradient(135deg, var(--violet), var(--watermelon));
  --grad-orange: linear-gradient(135deg, var(--orange), var(--amber));
  --grad-red: linear-gradient(135deg, var(--red), var(--watermelon));
}

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

body {
  font-family: var(--font);
  background: #020508;
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }
button { cursor: pointer; font-family: inherit; }

/* --------- CANVAS --------- */
#particle-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
}

/* --------- PRELOADER --------- */
#preloader {
  position: fixed;
  inset: 0;
  background: var(--text);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
#preloader.hidden { opacity: 0; visibility: hidden; }

.preloader-inner { display: flex; flex-direction: column; align-items: center; gap: 24px; }

.preloader-atom {
  position: relative;
  width: 80px; height: 80px;
}
.nucleus {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  width: 16px; height: 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 0 20px var(--cyan);
}
.orbit {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  border: 2px solid rgba(6,182,212,0.4);
  border-radius: 50%;
}
.orbit-1 { width: 50px; height: 30px; animation: spin 1.5s linear infinite; }
.orbit-2 { width: 70px; height: 35px; animation: spin 2s linear infinite reverse; transform: translate(-50%,-50%) rotate(60deg); }
.orbit-3 { width: 80px; height: 28px; animation: spin 2.5s linear infinite; transform: translate(-50%,-50%) rotate(-60deg); }
.electron {
  position: absolute;
  top: -4px; left: 50%;
  transform: translateX(-50%);
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
@keyframes spin { from { transform: translate(-50%,-50%) rotate(var(--start,0deg)); } to { transform: translate(-50%,-50%) rotate(calc(var(--start,0deg) + 360deg)); } }
.orbit-1 { --start: 0deg; }
.orbit-2 { --start: 60deg; }
.orbit-3 { --start: -60deg; }

.preloader-text {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  background: linear-gradient(90deg, var(--blue), var(--cyan), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 2s linear infinite;
  background-size: 200% auto;
}
@keyframes shimmer { to { background-position: 200% center; } }

/* --------- CONTAINER --------- */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --------- UTILITY --------- */
.gradient-text {
  background: linear-gradient(135deg, var(--blue) 0%, var(--cyan) 25%, var(--violet) 50%, var(--watermelon) 75%, var(--orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.highlight-text {
  background: linear-gradient(90deg, var(--cyan), var(--green));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(6,182,212,0.1));
  border: 1px solid rgba(37,99,235,0.2);
  color: var(--blue);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 16px;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.section-sub {
  font-size: 1.1rem;
  color: var(--text-s);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --------- BUTTONS --------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: white;
  font-weight: 700;
  font-size: 1rem;
  padding: 16px 32px;
  border-radius: var(--radius-btn);
  border: none;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 8px 32px rgba(37,99,235,0.35);
  z-index: 1;
}
.btn-primary .btn-glow {
  position: absolute;
  inset: -4px;
  background: linear-gradient(135deg, var(--blue), var(--cyan), var(--violet));
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s;
  filter: blur(8px);
}
.btn-primary:hover .btn-glow { opacity: 0.7; }
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 48px rgba(37,99,235,0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(12px);
  color: var(--text);
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-btn);
  border: 1.5px solid var(--border);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
.btn-secondary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.12);
  border-color: rgba(37,99,235,0.3);
}
.play-circle {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  display: flex; align-items: center; justify-content: center;
  color: white;
  flex-shrink: 0;
  transition: var(--transition);
}
.btn-secondary:hover .play-circle { transform: scale(1.1); box-shadow: 0 4px 16px rgba(37,99,235,0.4); }

.btn-primary-sm {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: white;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 10px;
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}
.btn-primary-sm:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.4); }

.btn-ghost {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-s);
  padding: 10px 16px;
  border-radius: 10px;
  transition: var(--transition);
}
.btn-ghost:hover { color: var(--blue); background: rgba(37,99,235,0.06); }

.btn-outline-large {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: 2px solid var(--blue);
  color: var(--blue);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 32px;
  border-radius: var(--radius-btn);
  transition: var(--transition);
}
.btn-outline-large:hover {
  background: var(--blue);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(37,99,235,0.35);
}

/* Magnetic Hover Effect */
.magnetic-btn { transition: transform 0.2s ease; }

/* --------- NAVBAR --------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 80px;
  z-index: 1000;
  transition: background 0.4s ease, backdrop-filter 0.4s, box-shadow 0.4s;
}
.navbar.scrolled {
  background: rgba(248,250,252,0.85);
  backdrop-filter: blur(24px) saturate(1.8);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  box-shadow: 0 2px 32px rgba(0,0,0,0.08);
  border-bottom: 1px solid rgba(255,255,255,0.5);
}

.nav-container {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon { width: 48px; height: 48px; }
.logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.logo-name { font-size: 1.1rem; font-weight: 800; color: var(--text); letter-spacing: -0.01em; }
.logo-sub { font-size: 0.7rem; font-weight: 500; color: var(--cyan); letter-spacing: 0.06em; text-transform: uppercase; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-s);
  padding: 8px 14px;
  border-radius: 8px;
  transition: var(--transition);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px; left: 50%;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--blue), var(--cyan));
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width 0.3s ease;
}
.nav-link:hover, .nav-link.active { color: var(--blue); }
.nav-link:hover::after, .nav-link.active::after { width: 60%; }

.nav-actions { display: flex; align-items: center; gap: 8px; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* --------- HERO SECTION --------- */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
  background: #EEF2FF;
}

.hero-bg { position: absolute; inset: 0; z-index: 0; overflow: hidden; }

.mesh-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 1;
  animation: blobFloat 8s ease-in-out infinite;
}
.blob-1 { width: 600px; height: 600px; background: radial-gradient(circle at center, #2563EB 0%, rgba(37,99,235,0.35) 45%, transparent 75%); top: -150px; left: -120px; animation-delay: 0s; }
.blob-2 { width: 500px; height: 500px; background: radial-gradient(circle at center, #06B6D4 0%, rgba(6,182,212,0.35) 45%, transparent 75%); top: 60px; right: -100px; animation-delay: 2s; }
.blob-3 { width: 450px; height: 450px; background: radial-gradient(circle at center, #FF6B8B 0%, rgba(255,107,139,0.35) 45%, transparent 75%); bottom: -100px; left: 15%; animation-delay: 4s; }
.blob-4 { width: 380px; height: 380px; background: radial-gradient(circle at center, #10B981 0%, rgba(16,185,129,0.3) 45%, transparent 75%); bottom: 20px; right: 10%; animation-delay: 1s; }
.blob-5 { width: 420px; height: 420px; background: radial-gradient(circle at center, #F97316 0%, rgba(249,115,22,0.3) 45%, transparent 75%); top: -80px; left: 38%; animation-delay: 3s; filter: blur(70px); animation: blobFloat 10s ease-in-out infinite; }

@keyframes blobFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(25px, -25px) scale(1.05); }
  66% { transform: translate(-15px, 20px) scale(0.95); }
}

.hex-pattern {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232563EB' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-container {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

/* Hero Content */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(6,182,212,0.08));
  border: 1px solid rgba(37,99,235,0.2);
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 7px 16px;
  border-radius: 100px;
  margin-bottom: 24px;
}
.badge-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(0.8); } }

.hero-title {
  font-size: clamp(2.8rem, 5.5vw, 4.5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--text);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-s);
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: 40px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }

.hero-stats { display: flex; align-items: center; gap: 24px; }
.stat-item { display: flex; flex-direction: column; }
.stat-item strong { font-size: 1.8rem; font-weight: 800; color: var(--text); line-height: 1; }
.stat-item span { font-size: 1.8rem; font-weight: 800; color: var(--blue); }
.stat-item small { font-size: 0.78rem; color: var(--text-s); font-weight: 500; margin-top: 2px; }
.stat-divider { width: 1px; height: 36px; background: var(--border); }

/* Hero Visual */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.teacher-frame {
  position: relative;
  width: 380px;
  height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.teacher-glow {
  position: absolute;
  inset: -60px;
  background: radial-gradient(circle, rgba(255, 107, 139, 0.28) 0%, rgba(139, 92, 246, 0.22) 30%, rgba(6, 182, 212, 0.18) 60%, transparent 80%);
  border-radius: 50%;
  animation: glowPulse 4s ease-in-out infinite;
}
@keyframes glowPulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.06); opacity: 1; }
}
.teacher-avatar {
  position: relative;
  z-index: 2;
  width: 340px;
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(32px);
  -webkit-backdrop-filter: blur(32px);
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  box-shadow: 0 32px 80px rgba(37,99,235,0.18), 0 0 40px rgba(6,182,212,0.08);
  padding: 24px;
  overflow: hidden;
}
.teacher-svg { width: 100%; height: auto; }

/* Floating Cards */
.float-card {
  position: absolute;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 16px;
  padding: 12px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.08);
  white-space: nowrap;
  z-index: 10;
  animation: floatCard 4s ease-in-out infinite;
}
.fc-icon { font-size: 1.4rem; }
.fc-1 { top: 10%; left: -15%; animation-delay: 0s; border: 2.5px solid var(--cyan); box-shadow: 0 8px 32px rgba(6, 182, 212, 0.25); }
.fc-2 { top: 55%; left: -20%; animation-delay: 1.5s; border: 2.5px solid var(--green); box-shadow: 0 8px 32px rgba(16, 185, 129, 0.25); }
.fc-3 { top: 5%; right: -18%; animation-delay: 1s; border: 2.5px solid var(--violet); box-shadow: 0 8px 32px rgba(139, 92, 246, 0.25); }
.fc-4 { top: 70%; right: -15%; animation-delay: 2.5s; border: 2.5px solid var(--orange); box-shadow: 0 8px 32px rgba(249, 115, 22, 0.25); }

@keyframes floatCard {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

/* Molecule SVGs */
.molecule-svg {
  position: absolute;
  z-index: 5;
  opacity: 0.85;
}
.mol-1 { width: 80px; bottom: 15%; left: -8%; animation: moleculeFloat 6s ease-in-out infinite; }
.mol-2 { width: 60px; top: -5%; right: 5%; animation: moleculeFloat 5s ease-in-out infinite reverse; }
@keyframes moleculeFloat {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(15deg); }
}

/* Atom Widget */
.atom-widget {
  position: absolute;
  bottom: -5%;
  right: -10%;
  width: 90px; height: 90px;
  z-index: 6;
}
.atom-nucleus {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  width: 18px; height: 18px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 0 16px rgba(6,182,212,0.6);
}
.atom-orbit {
  position: absolute;
  top: 50%; left: 50%;
  border: 1.5px solid rgba(6,182,212,0.5);
  border-radius: 50%;
}
.ao-1 { width: 50px; height: 24px; transform: translate(-50%,-50%); animation: atomSpin1 2s linear infinite; }
.ao-2 { width: 60px; height: 28px; transform: translate(-50%,-50%) rotate(60deg); animation: atomSpin2 2.5s linear infinite reverse; }
.ao-3 { width: 80px; height: 22px; transform: translate(-50%,-50%) rotate(-60deg); animation: atomSpin3 3s linear infinite; }
.atom-e {
  position: absolute;
  top: -4px; left: 50%;
  transform: translateX(-50%);
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 6px var(--cyan);
}
@keyframes atomSpin1 { from { transform: translate(-50%,-50%) rotate(0deg); } to { transform: translate(-50%,-50%) rotate(360deg); } }
@keyframes atomSpin2 { from { transform: translate(-50%,-50%) rotate(60deg); } to { transform: translate(-50%,-50%) rotate(420deg); } }
@keyframes atomSpin3 { from { transform: translate(-50%,-50%) rotate(-60deg); } to { transform: translate(-50%,-50%) rotate(300deg); } }

/* Periodic Element Cards */
.element-card {
  position: absolute;
  width: 64px;
  background: white;
  border-radius: 10px;
  padding: 6px 8px;
  text-align: center;
  font-weight: 700;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  z-index: 8;
  animation: elemFloat 5s ease-in-out infinite;
  border: 2px solid transparent;
}
.el-h { top: 30%; left: -12%; animation-delay: 0.5s; border-color: var(--blue); }
.el-c { bottom: 30%; right: -8%; animation-delay: 1.8s; border-color: var(--violet); }
.el-o { top: 75%; left: -5%; animation-delay: 3s; border-color: var(--red); }
.el-num { font-size: 0.55rem; color: var(--text-s); font-weight: 500; }
.el-sym { font-size: 1.4rem; line-height: 1; color: var(--text); }
.el-name { font-size: 0.48rem; color: var(--text-s); font-weight: 500; }
@keyframes elemFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-s);
  z-index: 5;
}
.scroll-mouse {
  width: 24px; height: 40px;
  border: 2px solid var(--text-s);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}
.scroll-dot {
  width: 4px; height: 8px;
  border-radius: 2px;
  background: var(--blue);
  animation: scrollDot 2s ease-in-out infinite;
}
@keyframes scrollDot { 0% { transform: translateY(0); opacity: 1; } 100% { transform: translateY(16px); opacity: 0; } }

/* --------- STATS SECTION --------- */
.stats-section {
  position: relative;
  z-index: 2;
  padding: 100px 0;
  background: radial-gradient(circle at 50% 50%, rgba(37, 99, 235, 0.05), transparent 60%), #FFFFFF;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}
.stat-card {
  position: relative;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-card);
  padding: 36px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  overflow: hidden;
  transition: var(--transition);
  cursor: default;
}
.stat-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 60px rgba(37,99,235,0.08), 0 0 30px rgba(6,182,212,0.06);
  border-color: rgba(37,99,235,0.3);
  background: rgba(255, 255, 255, 0.75);
}
.stat-icon {
  width: 60px; height: 60px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--c,#2563EB), var(--c2,#06B6D4));
  display: flex; align-items: center; justify-content: center;
  color: white;
  flex-shrink: 0;
  box-shadow: 0 4px 16px color-mix(in srgb, var(--c,#2563EB) 20%, transparent);
}
.stat-content { flex: 1; }
.stat-number { font-size: 2.2rem; font-weight: 900; color: var(--text); line-height: 1; display: flex; align-items: baseline; gap: 2px; }
.stat-number span:last-child { font-size: 1.5rem; color: var(--blue); }
.stat-label { font-size: 0.85rem; color: var(--text-s); font-weight: 600; margin-top: 4px; }
.stat-bg-num {
  position: absolute;
  right: 16px; bottom: 8px;
  font-size: 4.5rem;
  font-weight: 900;
  color: rgba(37, 99, 235, 0.04);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

/* --------- WHY SECTION --------- */
.why-section {
  position: relative;
  z-index: 2;
  padding: 120px 0;
  background: radial-gradient(circle at 10% 20%, rgba(139, 92, 246, 0.08), transparent 45%), radial-gradient(circle at 90% 80%, rgba(255, 107, 139, 0.08), transparent 45%), #F8FAFC;
  overflow: hidden;
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.why-card {
  position: relative;
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  overflow: hidden;
  transition: var(--transition);
  cursor: default;
}
.why-card:hover {
  transform: translateY(-10px) scale(1.02);
  border-color: var(--accent, var(--blue));
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.06), 0 0 40px color-mix(in srgb, var(--accent, var(--blue)) 20%, transparent);
}
.why-card:hover .why-card-glow {
  opacity: 1;
}
.why-card-glow {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent,var(--blue)) 10%, transparent), color-mix(in srgb, var(--accent2,var(--cyan)) 10%, transparent));
  opacity: 0;
  transition: opacity 0.4s;
  pointer-events: none;
}
.why-icon {
  width: 64px; height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent,var(--blue)) 15%, white), color-mix(in srgb, var(--accent2,var(--cyan)) 10%, white));
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 24px;
  color: var(--accent, var(--blue));
  transition: var(--transition);
}
.why-card:hover .why-icon {
  background: linear-gradient(135deg, var(--accent,var(--blue)), var(--accent2,var(--cyan)));
  color: white;
  transform: scale(1.1) rotate(8deg);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--accent, var(--blue)) 25%, transparent);
}
.why-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.why-card p { font-size: 0.92rem; color: var(--text-s); line-height: 1.7; }

/* --------- SUBJECTS SECTION --------- */
.subjects-section {
  position: relative;
  z-index: 2;
  padding: 120px 0;
  background: radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.08), transparent 45%), radial-gradient(circle at 20% 80%, rgba(249, 115, 22, 0.08), transparent 45%), #FFFFFF;
  overflow: hidden;
}
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.subject-card {
  position: relative;
  background: rgba(255, 255, 255, 0.35);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: 20px;
  padding: 32px 28px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  transition: var(--transition);
  overflow: hidden;
  cursor: default;
}
.subject-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 140px; height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--c,var(--blue)) 15%, transparent), transparent);
  transition: var(--transition);
}
.subject-card:hover {
  transform: translateY(-8px) scale(1.03);
  box-shadow: 0 30px 60px color-mix(in srgb, var(--c,var(--blue)) 12%, transparent), 0 0 30px color-mix(in srgb, var(--c,var(--blue)) 15%, transparent);
  border-color: var(--c, var(--blue));
  background: rgba(255, 255, 255, 0.6);
}
.subject-card:hover::before { transform: scale(1.6); }
.subj-icon { font-size: 2.8rem; margin-bottom: 20px; display: block; filter: drop-shadow(0 4px 8px rgba(0,0,0,0.1)); }
.subject-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.subject-card p { font-size: 0.88rem; color: var(--text-s); line-height: 1.6; margin-bottom: 18px; }
.subj-tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--c,var(--blue)), var(--c2,var(--cyan)));
  color: white;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 6px 12px;
  border-radius: 100px;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--c,var(--blue)) 30%, transparent);
}

/* --------- COURSES SECTION --------- */
.courses-section {
  position: relative;
  z-index: 2;
  padding: 120px 0;
  background: radial-gradient(circle at 30% 20%, rgba(37, 99, 235, 0.08), transparent 45%), radial-gradient(circle at 70% 80%, rgba(6, 182, 212, 0.08), transparent 45%), #F8FAFC;
  overflow: hidden;
}
.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}
.course-card {
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.6);
  transition: var(--transition);
  position: relative;
}
.course-card:hover {
  transform: translateY(-12px);
  box-shadow: 0 30px 60px rgba(37, 99, 235, 0.12), 0 0 30px rgba(6, 182, 212, 0.1);
  border-color: rgba(37, 99, 235, 0.4);
}
.course-image {
  height: 200px;
  background: var(--bg, linear-gradient(135deg, var(--blue), var(--cyan)));
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
}
.course-img-icon { font-size: 4rem; z-index: 2; position: relative; filter: drop-shadow(0 4px 16px rgba(0,0,0,0.3)); }
.course-badge-overlay {
  position: absolute;
  top: 16px; left: 16px;
  background: linear-gradient(135deg, var(--amber), var(--orange));
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 12px;
  border-radius: 100px;
  z-index: 3;
}
.course-badge-overlay.new { background: linear-gradient(135deg, var(--green), var(--cyan)); }
.course-particles {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 20% 80%, rgba(255,255,255,0.1) 1px, transparent 1px),
    radial-gradient(circle at 80% 20%, rgba(255,255,255,0.1) 1px, transparent 1px),
    radial-gradient(circle at 50% 50%, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 40px 40px, 60px 60px, 30px 30px;
}
.course-body { padding: 24px; }
.course-meta { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.course-grade {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--blue);
  background: rgba(37,99,235,0.08);
  padding: 4px 10px;
  border-radius: 6px;
}
.course-rating { display: flex; align-items: center; gap: 4px; font-size: 0.82rem; font-weight: 600; color: var(--amber); }
.stars { color: var(--amber); }
.course-title { font-size: 1.15rem; font-weight: 700; color: var(--text); margin-bottom: 8px; line-height: 1.3; }
.course-desc { font-size: 0.88rem; color: var(--text-s); line-height: 1.6; margin-bottom: 16px; }
.course-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.course-stats span {
  display: flex; align-items: center; gap: 4px;
  font-size: 0.78rem;
  color: var(--text-s);
  font-weight: 500;
}
.course-stats svg { color: var(--blue); }
.btn-course {
  display: flex; align-items: center; justify-content: space-between;
  background: linear-gradient(135deg, var(--btn-c,var(--blue)), var(--cyan));
  color: white;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 12px;
  transition: var(--transition);
  width: 100%;
}
.btn-course:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.35); opacity: 0.95; }
.courses-cta { text-align: center; }

/* --------- TEACHER SECTION --------- */
.teacher-section {
  position: relative;
  z-index: 2;
  padding: 120px 0;
  background: radial-gradient(circle at 10% 80%, rgba(37,99,235,0.06), transparent 45%), radial-gradient(circle at 90% 20%, rgba(139,92,246,0.06), transparent 45%), #FFFFFF;
  overflow: hidden;
}
.teacher-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 50%; height: 100%;
  background: linear-gradient(135deg, rgba(37,99,235,0.04), rgba(139,92,246,0.04));
  pointer-events: none;
}
.teacher-container {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: center;
}
.teacher-photo-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.teacher-photo-bg {
  position: absolute;
  inset: -20px;
  background: linear-gradient(135deg, rgba(37,99,235,0.12), rgba(139,92,246,0.12));
  border-radius: 50%;
  animation: teacherGlow 4s ease-in-out infinite;
}
@keyframes teacherGlow {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.teacher-photo {
  position: relative;
  width: 320px;
  background: linear-gradient(135deg, #f0f4ff, #faf5ff);
  border-radius: 32px;
  border: 2px solid rgba(37,99,235,0.15);
  box-shadow: 0 32px 80px rgba(37,99,235,0.15);
  overflow: hidden;
  z-index: 2;
}
.teacher-cert-badge {
  position: absolute;
  bottom: -12px; right: 16px;
  background: linear-gradient(135deg, var(--green), var(--cyan));
  color: white;
  display: flex; align-items: center; gap: 6px;
  font-size: 0.78rem; font-weight: 700;
  padding: 8px 16px;
  border-radius: 100px;
  box-shadow: 0 8px 24px rgba(16,185,129,0.35);
  z-index: 3;
}

.teacher-right .section-badge { margin-bottom: 12px; }
.teacher-right .section-title { text-align: left; margin-bottom: 20px; }
.teacher-bio {
  font-size: 1.05rem;
  color: var(--text-s);
  line-height: 1.8;
  margin-bottom: 32px;
}
.teacher-bio strong { color: var(--text); }

.teacher-achievements { display: flex; flex-direction: column; gap: 16px; margin-bottom: 36px; }
.achievement-item { display: flex; align-items: center; gap: 16px; }
.ach-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--c,var(--blue)) 12%, white);
  display: flex; align-items: center; justify-content: center;
  color: var(--c, var(--blue));
  flex-shrink: 0;
}
.achievement-item div:last-child { display: flex; flex-direction: column; }
.achievement-item strong { font-size: 0.9rem; font-weight: 700; color: var(--text); }
.achievement-item span { font-size: 0.8rem; color: var(--text-s); }

/* Timeline */
.teacher-timeline { display: flex; flex-direction: column; gap: 0; }
.timeline-item {
  display: flex;
  gap: 16px;
  padding-bottom: 24px;
  position: relative;
}
.timeline-item:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 11px;
  top: 24px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), transparent);
}
.tl-dot {
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 3px solid var(--border);
  background: white;
  flex-shrink: 0;
  transition: var(--transition);
}
.timeline-item.active .tl-dot, .timeline-item:hover .tl-dot {
  border-color: var(--blue);
  background: var(--blue);
  box-shadow: 0 0 12px rgba(37,99,235,0.4);
}
.tl-content strong { display: block; font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.tl-content p { font-size: 0.82rem; color: var(--text-s); line-height: 1.5; }

/* --------- FEATURES SECTION --------- */
.features-section {
  position: relative;
  z-index: 2;
  padding: 100px 0;
  background: transparent;
  overflow: hidden;
}
.features-bg { display: none; }
.features-section .section-header { position: relative; z-index: 1; }
.features-section .section-badge { background: rgba(37,99,235,0.2); border-color: rgba(37,99,235,0.4); color: #93C5FD; }
.features-section .section-title { color: white; }
.features-section .section-sub { color: #94A3B8; }

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
  z-index: 1;
}
.feature-card {
  background: rgba(255,255,255,0.05);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
  cursor: default;
}
.feature-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: color-mix(in srgb, var(--c,var(--blue)) 50%, transparent);
  transform: translateY(-8px);
  box-shadow: 0 24px 48px rgba(0,0,0,0.3), 0 0 0 1px color-mix(in srgb, var(--c,var(--blue)) 30%, transparent);
}
.feat-icon {
  width: 60px; height: 60px;
  border-radius: 16px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--c,var(--blue)) 30%, transparent), color-mix(in srgb, var(--c,var(--blue)) 15%, transparent));
  display: flex; align-items: center; justify-content: center;
  color: var(--c, var(--blue));
  margin: 0 auto 16px;
  transition: var(--transition);
}
.feature-card:hover .feat-icon {
  background: linear-gradient(135deg, var(--c,var(--blue)), color-mix(in srgb, var(--c,var(--blue)) 70%, var(--cyan)));
  color: white;
}
.feature-card h4 { font-size: 0.95rem; font-weight: 700; color: white; margin-bottom: 8px; }
.feature-card p { font-size: 0.82rem; color: #94A3B8; line-height: 1.6; }

/* --------- TESTIMONIALS SECTION --------- */
.testimonials-section {
  position: relative;
  z-index: 2;
  padding: 120px 0;
  background: radial-gradient(circle at 70% 20%, rgba(255, 107, 139, 0.08), transparent 45%), radial-gradient(circle at 30% 80%, rgba(139, 92, 246, 0.08), transparent 45%), #F8FAFC;
  overflow: hidden;
}
.testimonials-carousel { position: relative; }
.testimonials-track {
  display: flex;
  gap: 24px;
  overflow: hidden;
}
.testimonial-card {
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-card);
  padding: 40px 32px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  min-width: calc(33.333% - 16px);
  flex-shrink: 0;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s;
  position: relative;
  overflow: hidden;
}
.testimonial-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--cyan), var(--violet), var(--watermelon));
}
.testimonial-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 60px rgba(139, 92, 246, 0.1), 0 0 30px rgba(255, 107, 139, 0.08);
  border-color: rgba(139, 92, 246, 0.3);
}
.testi-quote { font-size: 4rem; color: var(--blue); opacity: 0.2; line-height: 1; margin-bottom: -8px; }
.testi-text { font-size: 0.95rem; color: var(--text-s); line-height: 1.8; margin-bottom: 24px; font-style: italic; }
.testi-author { display: flex; align-items: center; gap: 16px; }
.testi-avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c,var(--blue)), var(--cyan));
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 0.9rem;
  font-weight: 700;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.testi-info strong { display: block; font-size: 0.95rem; font-weight: 700; color: var(--text); }
.testi-info span { font-size: 0.8rem; color: var(--text-s); }
.testi-stars { color: var(--amber); font-size: 0.9rem; margin-top: 2px; }

.carousel-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
}
.carousel-btn {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(8px);
  border: 1.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text);
  transition: var(--transition);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
.carousel-btn:hover {
  background: var(--blue);
  color: white;
  border-color: var(--blue);
  transform: scale(1.08);
}
.carousel-dots { display: flex; gap: 8px; }
.carousel-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: var(--transition);
}
.carousel-dot.active { background: var(--blue); width: 24px; border-radius: 4px; }

/* --------- FAQ SECTION --------- */
.faq-section {
  position: relative;
  z-index: 2;
  padding: 120px 0;
  background: radial-gradient(circle at 20% 20%, rgba(6, 182, 212, 0.08), transparent 45%), radial-gradient(circle at 80% 80%, rgba(16, 185, 129, 0.08), transparent 45%), #FFFFFF;
  overflow: hidden;
}
.faq-container .section-header { text-align: center; }
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.6);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:has(.faq-question[aria-expanded="true"]) {
  border-color: rgba(37,99,235,0.4);
  box-shadow: 0 16px 40px rgba(37,99,235,0.08);
  background: rgba(255, 255, 255, 0.7);
}
.faq-question {
  width: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  background: none;
  border: none;
  padding: 22px 28px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}
.faq-question span { display: flex; align-items: center; gap: 14px; }
.faq-icon { color: var(--blue); flex-shrink: 0; }
.faq-arrow { flex-shrink: 0; transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1); color: var(--text-s); }
.faq-question[aria-expanded="true"] .faq-arrow { transform: rotate(180deg); }
.faq-question[aria-expanded="true"] { color: var(--blue); }
.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
.faq-answer.open { grid-template-rows: 1fr; }
.faq-answer p {
  overflow: hidden;
  padding: 0 28px 22px;
  font-size: 0.92rem;
  color: var(--text-s);
  line-height: 1.7;
}

/* --------- CTA BAND --------- */
.cta-band {
  position: relative;
  z-index: 2;
  padding: 80px 0;
  background: linear-gradient(135deg, var(--blue) 0%, #1D4ED8 50%, var(--violet) 100%);
  overflow: hidden;
}
.cta-bg { position: absolute; inset: 0; }
.cta-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.3;
}
.cta-b1 { width: 400px; height: 400px; background: radial-gradient(circle, white, transparent); top: -200px; left: -100px; }
.cta-b2 { width: 300px; height: 300px; background: radial-gradient(circle, var(--cyan), transparent); bottom: -100px; right: -50px; }
.cta-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  position: relative;
  z-index: 1;
}
.cta-left h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 800; color: white; margin-bottom: 8px; }
.cta-left p { font-size: 1rem; color: rgba(255,255,255,0.8); }
.cta-right { display: flex; align-items: center; gap: 16px; flex-shrink: 0; }
.btn-cta-white {
  display: inline-flex; align-items: center; gap: 10px;
  background: white;
  color: var(--blue);
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-btn);
  transition: var(--transition);
  box-shadow: 0 8px 32px rgba(0,0,0,0.15);
}
.btn-cta-white:hover { transform: translateY(-3px); box-shadow: 0 16px 48px rgba(0,0,0,0.2); }
.btn-cta-outline {
  display: inline-flex; align-items: center; gap: 10px;
  background: transparent;
  color: white;
  font-weight: 600;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-btn);
  border: 2px solid rgba(255,255,255,0.5);
  transition: var(--transition);
}
.btn-cta-outline:hover { border-color: white; background: rgba(255,255,255,0.1); }

/* --------- FOOTER --------- */
.footer {
  position: relative;
  z-index: 2;
  background: var(--text);
  color: white;
}
.footer-top { padding: 80px 0 40px; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 48px;
}
.footer-brand .logo-name { color: white; }
.footer-logo-link .logo-sub { color: var(--cyan); }
.footer-tagline { font-size: 0.88rem; color: #94A3B8; line-height: 1.7; margin: 16px 0 24px; max-width: 280px; }
.social-links { display: flex; gap: 10px; }
.social-link {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center;
  color: #94A3B8;
  transition: var(--transition);
}
.social-link:hover {
  background: var(--sc, var(--blue));
  border-color: var(--sc, var(--blue));
  color: white;
  transform: translateY(-3px);
}
.footer-col-title { font-size: 0.88rem; font-weight: 700; color: white; letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 20px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 0.88rem; color: #94A3B8; transition: var(--transition); }
.footer-links a:hover { color: var(--cyan); transform: translateX(4px); display: inline-block; }
.footer-contact-list { display: flex; flex-direction: column; gap: 12px; }
.footer-contact-list li { display: flex; align-items: center; gap: 10px; font-size: 0.88rem; color: #94A3B8; }
.footer-contact-list svg { color: var(--cyan); flex-shrink: 0; }
.newsletter p { font-size: 0.82rem; color: #94A3B8; margin-bottom: 12px; }
.newsletter-form {
  display: flex;
  gap: 8px;
}
.newsletter-form input {
  flex: 1;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 10px;
  padding: 10px 14px;
  color: white;
  font-size: 0.85rem;
  font-family: inherit;
  outline: none;
  transition: var(--transition);
}
.newsletter-form input::placeholder { color: #64748B; }
.newsletter-form input:focus { border-color: var(--blue); background: rgba(37,99,235,0.1); }
.newsletter-form button {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border: none;
  color: white;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}
.newsletter-form button:hover { transform: scale(1.05); box-shadow: 0 4px 16px rgba(37,99,235,0.4); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 24px 0;
}
.footer-bottom-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.footer-bottom-inner p { font-size: 0.82rem; color: #64748B; }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { font-size: 0.82rem; color: #64748B; transition: color 0.2s; }
.footer-bottom-links a:hover { color: var(--cyan); }

/* --------- BACK TO TOP --------- */
.back-to-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 52px; height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: white;
  border: none;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(37,99,235,0.4);
  z-index: 500;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); box-shadow: 0 16px 32px rgba(37,99,235,0.5); }

/* --------- AOS ANIMATIONS --------- */
[data-aos] { opacity: 0; transition: opacity 0.7s ease, transform 0.7s ease; }
[data-aos="fade-up"] { transform: translateY(40px); }
[data-aos="fade-right"] { transform: translateX(-40px); }
[data-aos="fade-left"] { transform: translateX(40px); }
[data-aos="zoom-in"] { transform: scale(0.85); }
[data-aos].aos-animate { opacity: 1; transform: none; }

/* --------- RESPONSIVE --------- */
@media (max-width: 1200px) {
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .subjects-grid { grid-template-columns: repeat(3, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 1024px) {
  .hero-container { grid-template-columns: 1fr; text-align: center; }
  .hero-content { order: 2; }
  .hero-visual { order: 1; }
  .hero-subtitle { margin: 0 auto 40px; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-title { font-size: clamp(2.4rem, 5vw, 3.5rem); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .courses-grid { grid-template-columns: repeat(2, 1fr); }
  .teacher-container { grid-template-columns: 1fr; text-align: center; }
  .teacher-left { display: flex; justify-content: center; }
  .teacher-right .section-title { text-align: center; }
  .cta-content { flex-direction: column; text-align: center; }
  .cta-left h2 { font-size: 1.8rem; }
  .float-card { display: none; }
  .el-h, .el-c, .el-o, .atom-widget { display: none; }
  .mol-1, .mol-2 { display: none; }
}

@media (max-width: 768px) {
  .nav-links { display: none; position: fixed; top: 80px; left: 0; right: 0; background: rgba(248,250,252,0.97); backdrop-filter: blur(20px); flex-direction: column; padding: 24px; gap: 4px; border-bottom: 1px solid var(--border); z-index: 999; }
  .nav-links.open { display: flex; }
  .nav-link { padding: 12px 16px; border-radius: 10px; }
  .hamburger { display: flex; }
  .btn-ghost, .btn-primary-sm span { display: none; }
  .btn-primary-sm { padding: 10px; border-radius: 10px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr; }
  .subjects-grid { grid-template-columns: repeat(2, 1fr); }
  .courses-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-track { flex-direction: column; }
  .testimonial-card { min-width: 100%; }
  .teacher-photo { width: 260px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom-inner { flex-direction: column; text-align: center; }
  .cta-right { flex-direction: column; width: 100%; }
  .btn-cta-white, .btn-cta-outline { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .subjects-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2.2rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
}

/* Ripple effect */
.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  transform: scale(0);
  animation: rippleAnim 0.6s linear;
  pointer-events: none;
}
@keyframes rippleAnim {
  to { transform: scale(4); opacity: 0; }
}

/* ============================================================
   SEO & ACCESSIBILITY UTILITIES
   ============================================================ */

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

/* Core Web Vitals — reduce CLS */
img, video, iframe, embed, object {
  max-width: 100%;
  height: auto;
}

/* All images lazy-load by default */
img:not([loading]) {
  loading: lazy; /* CSS fallback hint */
}

/* Prevent invisible text during webfont load (avoid FID / LCP penalty) */
@font-face {
  font-display: swap;
}

/* Focus visible for keyboard navigation (Core Web Vitals accessibility) */
:focus-visible {
  outline: 3px solid #FF7A00;
  outline-offset: 3px;
  border-radius: 4px;
}

/* Smooth scroll — improves UX signals */
html {
  scroll-behavior: smooth;
}

/* Prefers reduced motion — accessibility */
@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;
  }
}

/* Print styles — clean indexed content */
@media print {
  .navbar, .back-to-top, .hero-visual, .social-links, .newsletter { display: none !important; }
  body { font-size: 12pt; color: #000; background: #fff; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 10pt; }
  .footer-tagline, .hero-title, .hero-subtitle { color: #000 !important; }
}