/* ═══════════════════════════════════════════════════════════════
   CLB Trí Tuệ Trẻ — Main Stylesheet
   Dark chess theme with gold accents, glassmorphism & animations
════════════════════════════════════════════════════════════════ */

/* ─── CSS Variables ──────────────────────────────────────────── */
:root {
  --gold: #f59e0b;
  --gold-light: #fbbf24;
  --gold-dark: #d97706;
  --navy: #ffffff;
  --navy-2: #f8fafc;
  --navy-3: #f1f5f9;
  --navy-4: #e2e8f0;
  --white: #0f172a;
  --white-80: rgba(15, 23, 42, 0.8);
  --white-60: rgba(15, 23, 42, 0.6);
  --white-20: rgba(15, 23, 42, 0.2);
  --white-10: rgba(15, 23, 42, 0.1);
  --white-05: rgba(15, 23, 42, 0.05);
  --accent: #2563eb;
  --accent-2: #3b82f6;
  --success: #22c55e;
  --danger: #ef4444;
  --glass: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(37, 99, 235, 0.2);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
  --shadow-gold: 0 0 40px rgba(245, 158, 11, 0.15);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Outfit', 'Be Vietnam Pro', 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', 'Times New Roman', serif;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: var(--font);
  background: var(--navy);
  color: var(--white);
  overflow-x: hidden;
  line-height: 1.7;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ─── Utilities ──────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-light) 50%, var(--gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  border-radius: var(--radius);
}

/* ─── Animations ─────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes pulse-gold {
  0%, 100% { box-shadow: 0 0 20px rgba(212,168,71,0.3); }
  50% { box-shadow: 0 0 40px rgba(212,168,71,0.6); }
}
@keyframes chess-flash {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.7; }
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}
@keyframes spin { to { transform: rotate(360deg); } }

.animate-fade-up {
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}
.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

/* Scroll-triggered reveal */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── NAVBAR ─────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.logo-icon {
  font-size: 28px;
  filter: drop-shadow(0 0 8px rgba(212,168,71,0.6));
  color: var(--gold);
}

.logo-text { color: var(--white); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  color: var(--white-80);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--white);
  background: var(--white-10);
}

.nav-cta {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)) !important;
  color: #ffffff !important;
  font-weight: 700 !important;
  padding: 10px 20px !important;
  border-radius: 10px !important;
  font-size: 13px !important;
  letter-spacing: 0.3px;
  box-shadow: 0 4px 15px rgba(212,168,71,0.3);
  transition: var(--transition) !important;
}

.nav-cta:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 8px 25px rgba(212,168,71,0.4) !important;
  background: none !important;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

/* ─── HERO ───────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-chess-board {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.chess-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  height: 100%;
}

.chess-cell {
  opacity: 0;
  transition: opacity 0.5s ease;
}
.chess-cell.light { background: rgba(212,168,71,0.08); }
.chess-cell.dark  { background: rgba(37, 99, 235, 0.15); }
.chess-cell.active { animation: chess-flash 3s infinite; }

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.5) 0%, rgba(255, 255, 255, 0.9) 60%, var(--navy) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(212,168,71,0.15);
  border: 1px solid rgba(212,168,71,0.3);
  color: var(--gold-light);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 20px;
  border-radius: 100px;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(42px, 7vw, 80px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  margin-bottom: 20px;
  color: var(--white);
}

.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 22px);
  color: var(--white-60);
  margin-bottom: 40px;
  font-weight: 300;
  letter-spacing: 0.5px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.btn-primary {
  color: #fff !important;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, #60a5fa 100%);
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  padding: 16px 32px;
  border-radius: 12px;
  transition: var(--transition);
  box-shadow: 0 8px 30px rgba(212,168,71,0.35);
  letter-spacing: 0.3px;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(212,168,71,0.5);
}

.btn-primary svg { transition: transform 0.3s ease; }
.btn-primary:hover svg { transform: translateX(4px); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--white-10);
  border: 1px solid var(--glass-border);
  color: var(--white);
  font-size: 16px;
  font-weight: 500;
  padding: 16px 32px;
  border-radius: 12px;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--white-20);
  transform: translateY(-2px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 10px;
  transition: var(--transition);
  margin-top: 24px;
}
.btn-outline:hover {
  background: rgba(212,168,71,0.1);
  transform: translateY(-2px);
}

.hero-scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--white-40, rgba(15, 23, 42, 0.5));
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, transparent, var(--gold), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

/* Floating pieces */
.floating-pieces {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.fp {
  position: absolute;
  font-size: clamp(24px, 4vw, 48px);
  color: rgba(212,168,71,0.15);
  animation: float linear infinite;
  user-select: none;
}
.fp-1 { top: 15%; left: 8%;  animation-duration: 7s;  animation-delay: 0s; }
.fp-2 { top: 25%; right: 10%; animation-duration: 9s;  animation-delay: 1s; }
.fp-3 { bottom: 30%; left: 5%; animation-duration: 11s; animation-delay: 2s; }
.fp-4 { bottom: 20%; right: 8%; animation-duration: 8s; animation-delay: 0.5s; }
.fp-5 { top: 60%; left: 15%; animation-duration: 10s; animation-delay: 1.5s; }
.fp-6 { top: 40%; right: 5%;  animation-duration: 6s;  animation-delay: 3s; }

/* ─── STATS BAR ───────────────────────────────────────────────── */
.stats-bar {
  background: linear-gradient(135deg, var(--navy-3), var(--navy-4));
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  padding: 40px 24px;
}

.stats-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.stat-item {
  flex: 1;
  min-width: 150px;
  max-width: 220px;
  text-align: center;
  padding: 20px 24px;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: var(--glass-border);
}

.stat-icon { font-size: 28px; margin-bottom: 8px; }
.stat-value {
  font-size: 36px;
  font-weight: 800;
  color: var(--gold-light);
  line-height: 1;
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}
.stat-label {
  font-size: 13px;
  color: var(--white-60);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ─── SECTIONS (common) ──────────────────────────────────────── */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  background: rgba(212,168,71,0.12);
  border: 1px solid rgba(212,168,71,0.25);
  color: var(--gold);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  padding: 6px 18px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.15;
  color: var(--white);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 17px;
  color: var(--white-60);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─── ABOUT SECTION ──────────────────────────────────────────── */
.about-section { background: var(--navy); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text {
  font-size: 17px;
  color: var(--white-80);
  line-height: 1.9;
  margin-bottom: 8px;
}

.about-visual-col { position: relative; display: flex; justify-content: center; }

.about-chess-art {
  position: relative;
  width: 340px;
  height: 340px;
}

.chess-art-board {
  width: 280px;
  height: 280px;
  border-radius: 16px;
  overflow: hidden;
  border: 2px solid rgba(212,168,71,0.3);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1), inset 0 0 40px rgba(212,168,71,0.05);
}

.chess-art-grid {
  display: grid;
  grid-template-columns: repeat(8,1fr);
  grid-template-rows: repeat(8,1fr);
  width: 100%;
  height: 100%;
}

.chess-art-cell { }
.chess-art-cell.light { background: rgba(212,168,71,0.2); }
.chess-art-cell.dark  { background: rgba(241, 245, 249, 0.8); }

.chess-art-piece {
  position: absolute;
  font-size: 80px;
  bottom: 20px;
  right: 10px;
  filter: drop-shadow(0 4px 20px rgba(212,168,71,0.4));
  animation: float 6s ease-in-out infinite;
  line-height: 1;
  color: var(--gold);
}

.chess-art-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle at center, rgba(212,168,71,0.08), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* ─── ACTIVITIES SECTION ─────────────────────────────────────── */
.activities-section {
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy-2) 100%);
}

.activities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.activity-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.activity-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(212,168,71,0.05) 0%, transparent 60%);
  opacity: 0;
  transition: var(--transition);
}

.activity-card:hover {
  transform: translateY(-8px);
  border-color: rgba(212,168,71,0.3);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.05), var(--shadow-gold);
}

.activity-card:hover::before { opacity: 1; }

.activity-card.inactive {
  opacity: 0.6;
}

.activity-icon-wrap {
  width: 60px;
  height: 60px;
  background: rgba(212,168,71,0.12);
  border: 1px solid rgba(212,168,71,0.2);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
  transition: var(--transition);
}

.activity-card:hover .activity-icon-wrap {
  background: rgba(212,168,71,0.2);
  transform: scale(1.1);
}

.activity-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--white);
}

.activity-desc {
  font-size: 14px;
  color: var(--white-60);
  line-height: 1.7;
}

.activity-badge {
  display: inline-block;
  margin-top: 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
  background: rgba(212,168,71,0.15);
  color: var(--gold);
  border: 1px solid rgba(212,168,71,0.2);
}

.activity-badge.coming {
  background: rgba(79,142,247,0.1);
  color: #7eb3ff;
  border-color: rgba(79,142,247,0.2);
}

/* ─── ACHIEVEMENTS SECTION ───────────────────────────────────── */
.achievements-section { background: var(--navy-2); }

.achievements-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 800px;
  margin: 0 auto;
}

.achievements-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, rgba(212,168,71,0.4), transparent);
  transform: translateX(-50%);
}

.achievement-item {
  display: flex;
  gap: 40px;
  align-items: flex-start;
  padding: 32px 0;
  position: relative;
}

.achievement-item:nth-child(even) {
  flex-direction: row-reverse;
}

.achievement-item:nth-child(even) .achievement-content {
  text-align: right;
}

.achievement-year-badge {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--gold-dark), var(--gold));
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
  padding: 6px 14px;
  border-radius: 100px;
  white-space: nowrap;
  z-index: 1;
  box-shadow: 0 4px 15px rgba(212,168,71,0.3);
}

.achievement-content {
  flex: 1;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px 28px;
  transition: var(--transition);
}

.achievement-content:hover {
  border-color: rgba(212,168,71,0.25);
  box-shadow: var(--shadow);
}

.achievement-spacer { flex: 1; }

.achievement-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.achievement-desc {
  font-size: 14px;
  color: var(--white-60);
  line-height: 1.6;
}

.achievement-cat {
  display: inline-block;
  margin-top: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--gold);
}

/* ─── GALLERY SECTION ────────────────────────────────────────── */
.gallery-section { background: var(--navy); }

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4/3;
  background: var(--navy-3);
  border: 1px solid var(--glass-border);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-item:hover img { transform: scale(1.08); }

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.2) 0%, transparent 60%);
  opacity: 0;
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
  padding: 16px;
}

.gallery-item:hover .gallery-overlay { opacity: 1; }

.gallery-caption {
  font-size: 13px;
  color: var(--white-80);
  font-weight: 500;
}

.gallery-empty {
  grid-column: 1/-1;
  text-align: center;
  padding: 60px;
  color: var(--white-40, rgba(15, 23, 42, 0.5));
  font-size: 16px;
}

.gallery-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  aspect-ratio: 4/3;
  background: var(--glass);
  border: 1px dashed var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--white-40, rgba(15, 23, 42, 0.5));
  font-size: 40px;
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  padding: 40px;
}

.lightbox.open { display: flex; }

.lightbox img {
  max-width: 90vw;
  max-height: 80vh;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 20px; right: 24px;
  font-size: 24px;
  color: var(--white-60);
  cursor: pointer;
  background: var(--white-10);
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.lightbox-close:hover { background: var(--white-20); color: var(--white); }

.lightbox-caption {
  color: var(--white-60);
  font-size: 14px;
  text-align: center;
}

/* ─── PROGRAMS SECTION ───────────────────────────────────────── */
.programs-section {
  background: linear-gradient(180deg, var(--navy-2) 0%, var(--navy) 100%);
}

.programs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.program-card {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.program-card.active {
  background: linear-gradient(135deg, rgba(212,168,71,0.08) 0%, rgba(212,168,71,0.03) 100%);
  border-color: rgba(212,168,71,0.3);
  animation: pulse-gold 3s ease-in-out infinite;
}

.program-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.05);
}

.program-card.active:hover {
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.05), 0 0 50px rgba(212,168,71,0.2);
}

.program-badge {
  position: absolute;
  top: 16px; right: 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 100px;
}

.program-badge.active-badge {
  background: rgba(34,197,94,0.15);
  color: #4ade80;
  border: 1px solid rgba(34,197,94,0.3);
}

.program-badge.coming-badge {
  background: rgba(79,142,247,0.1);
  color: #7eb3ff;
  border: 1px solid rgba(79,142,247,0.2);
}

.program-icon {
  font-size: 44px;
  line-height: 1;
  filter: drop-shadow(0 4px 12px rgba(212,168,71,0.3));
}

.program-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
}

.program-desc {
  font-size: 14px;
  color: var(--white-60);
  line-height: 1.7;
  flex: 1;
}

.program-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold);
  padding: 10px 0;
  border-top: 1px solid var(--glass-border);
  transition: var(--transition);
  margin-top: auto;
}

.program-cta:hover { gap: 14px; }

.program-cta-soon {
  font-size: 13px;
  color: var(--white-40, rgba(15, 23, 42, 0.5));
  padding: 10px 0;
  border-top: 1px solid var(--glass-border);
  margin-top: auto;
}

/* ─── CONTACT SECTION ────────────────────────────────────────── */
.contact-section { background: var(--navy-2); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 60px;
  align-items: start;
}

.contact-info { display: flex; flex-direction: column; gap: 20px; }

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  transition: var(--transition);
}

.contact-item:hover {
  border-color: rgba(212,168,71,0.2);
}

.ci-icon { font-size: 24px; flex-shrink: 0; }

.ci-text { display: flex; flex-direction: column; gap: 4px; }
.ci-text strong { font-size: 13px; color: var(--white-60); font-weight: 600; text-transform: uppercase; letter-spacing: 1px; }
.ci-text span { font-size: 15px; color: var(--white-80); }

.contact-socials { display: flex; gap: 12px; }

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--glass-border);
}

.social-btn.facebook {
  background: rgba(24,119,242,0.1);
  color: #4f8ef7;
  border-color: rgba(24,119,242,0.2);
}
.social-btn.facebook:hover {
  background: rgba(24,119,242,0.2);
  transform: translateY(-2px);
}

.social-btn.zalo {
  background: rgba(0,163,255,0.1);
  color: #29b6f6;
  border-color: rgba(0,163,255,0.2);
}
.social-btn.zalo:hover {
  background: rgba(0,163,255,0.2);
  transform: translateY(-2px);
}

/* Contact Form */
.contact-form {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 40px;
}

.contact-form h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 28px;
  color: var(--white);
}

.form-group { margin-bottom: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.form-group input,
.form-group textarea {
  width: 100%;
  background: var(--navy);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  padding: 14px 18px;
  color: var(--white);
  font-size: 15px;
  outline: none;
  transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder { color: rgba(15, 23, 42, 0.4); }

.form-group input:focus,
.form-group textarea:focus {
  border-color: rgba(212,168,71,0.4);
  box-shadow: 0 0 0 3px rgba(212,168,71,0.08);
}

.form-group textarea { resize: vertical; min-height: 120px; }

.form-submit {
  width: 100%;
  justify-content: center;
  margin-top: 8px;
  font-size: 15px;
}

.form-status {
  margin-top: 12px;
  font-size: 14px;
  text-align: center;
  min-height: 20px;
}
.form-status.success { color: var(--success); }
.form-status.error { color: var(--danger); }

/* ─── FOOTER ─────────────────────────────────────────────────── */
.footer {
  background: var(--navy);
  border-top: 1px solid var(--glass-border);
  padding: 40px 24px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
}

.footer-text { font-size: 13px; color: var(--white-40, rgba(15, 23, 42, 0.5)); }

.footer-links { display: flex; gap: 20px; }
.footer-links a {
  font-size: 13px;
  color: var(--white-60);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--gold); }

/* ─── RESPONSIVE ─────────────────────────────────────────────── */
@media (max-width: 968px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-visual-col { display: none; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .achievements-timeline::before { display: none; }
  .achievement-item,
  .achievement-item:nth-child(even) { flex-direction: column; gap: 0; }
  .achievement-year-badge { position: relative; left: auto; transform: none; display: inline-block; margin-bottom: 12px; }
  .achievement-item:nth-child(even) .achievement-content { text-align: left; }
  .achievement-spacer { display: none; }
  .stat-item:not(:last-child)::after { display: none; }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0; right: -100%;
    height: 100vh;
    width: 280px;
    flex-direction: column;
    align-items: flex-start;
    background: var(--navy-2);
    border-left: 1px solid var(--glass-border);
    padding: 100px 24px 40px;
    gap: 4px;
    transition: right 0.3s ease;
    z-index: 999;
  }
  .nav-links.open { right: 0; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; width: 100%; padding: 14px 16px; }
  .nav-hamburger { display: flex; z-index: 1000; }
  .form-row { grid-template-columns: 1fr; }
  .footer-container { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
  .section { padding: 72px 0; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  .stats-container { gap: 0; }
  .stat-item { min-width: 50%; }
}
\n
/* ─── SCHEDULE MODAL ─────────────────────────────────────────── */
.schedule-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.schedule-modal.open {
  opacity: 1;
  visibility: visible;
}

.schedule-modal-content {
  background: var(--navy);
  width: 90%;
  max-width: 600px;
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
  transform: translateY(20px);
  transition: all 0.3s ease;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  border: 1px solid var(--glass-border);
}

.schedule-modal.open .schedule-modal-content {
  transform: translateY(0);
}

.schedule-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 20px;
  background: var(--navy-3);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--white);
  transition: var(--transition);
}

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

.schedule-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 20px;
  text-align: center;
}

.schedule-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 24px;
  background: var(--navy-3);
  padding: 6px;
  border-radius: 12px;
}

.schedule-tab {
  flex: 1;
  padding: 12px;
  text-align: center;
  font-weight: 600;
  cursor: pointer;
  border-radius: 8px;
  transition: var(--transition);
  color: var(--white-80);
}

.schedule-tab.active {
  background: var(--white);
  color: var(--accent);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.schedule-pane {
  display: none;
  animation: fadeIn 0.4s ease;
}

.schedule-pane.active {
  display: block;
}

.schedule-table {
  width: 100%;
  border-collapse: collapse;
}

.schedule-table th, .schedule-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--navy-3);
}

.schedule-table th {
  font-weight: 700;
  color: var(--white-60);
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 1px;
}

.schedule-table td {
  color: var(--white);
  font-weight: 500;
}

.schedule-table tr:last-child td {
  border-bottom: none;
}