/* ============================================
   深圳大學龍華研究院 - Exhibition Website
   ============================================ */

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0f1a;
  --bg-secondary: #0d1525;
  --bg-card: rgba(15, 25, 50, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #e8ecf1;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #0d9488;
  --accent-light: #14b8a6;
  --accent-glow: rgba(13, 148, 136, 0.3);
  --gold: #d4a853;
  --gold-light: #f0d078;
  --blue: #3b82f6;
  --blue-light: #60a5fa;
  --gradient-primary: linear-gradient(135deg, #0d9488 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-gold: linear-gradient(135deg, #d4a853 0%, #f0d078 50%, #d4a853 100%);
  --gradient-dark: linear-gradient(180deg, #0a0f1a 0%, #0d1525 50%, #111827 100%);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg: 0 16px 64px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 40px var(--accent-glow);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1280px;
}

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

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

body {
  font-family: 'Noto Sans HK', 'PingFang HK', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, video { max-width: 100%; display: block; }

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

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

.text-muted { color: var(--text-muted); }

/* --- Glass Card --- */
.glass-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
}

.glass-card:hover {
  border-color: rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.05);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 15, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  padding: 0.6rem 0;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.nav-logo-img {
  height: 64px;
  width: auto;
  flex-shrink: 0;
}

.footer-logo-img {
  height: 80px;
  width: auto;
  flex-shrink: 0;
}

.logo-icon {
  color: var(--accent-light);
  font-size: 1.5rem;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 400;
  color: var(--text-secondary);
  transition: var(--transition);
  letter-spacing: 0.02em;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

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

.hero-video-wrapper {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  background: #0a0f1a;
}

.hero-video {
  position: absolute;
  top: 50%;
  left: 50%;
  min-width: 100%;
  min-height: 100%;
  width: auto;
  height: auto;
  transform: translate(-50%, -50%);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(13,148,136,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(59,130,246,0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(139,92,246,0.08) 0%, transparent 50%),
    linear-gradient(180deg, rgba(10,15,26,0.3) 0%, rgba(10,15,26,0.7) 70%, var(--bg-primary) 100%);
  z-index: 1;
}

.hero-particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 0 2rem;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  font-size: 0.85rem;
  color: var(--accent-light);
  margin-bottom: 2rem;
  letter-spacing: 0.05em;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-light);
  border-radius: 50%;
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; box-shadow: 0 0 4px var(--accent-light); }
  50% { opacity: 0.4; box-shadow: 0 0 12px var(--accent-light); }
}

.hero-title {
  font-size: clamp(3rem, 6vw, 5.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.title-line1 {
  display: block;
  font-size: 0.45em;
  font-weight: 400;
  color: var(--text-secondary);
  letter-spacing: 0.15em;
  margin-bottom: 0.3rem;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: center;
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 900;
  font-family: 'Orbitron', monospace;
  color: var(--text-primary);
  display: block;
  line-height: 1;
}

.stat-unit {
  font-size: 1rem;
  font-weight: 400;
  color: var(--accent-light);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: block;
  margin-top: 0.3rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-block;
  padding: 0.85rem 2.2rem;
  background: var(--gradient-primary);
  color: #fff;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-outline {
  display: inline-block;
  padding: 0.85rem 2.2rem;
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--text-primary);
  border-radius: 50px;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  transition: var(--transition);
  background: rgba(255,255,255,0.03);
}

.btn-outline:hover {
  border-color: rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.08);
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  animation: bounce-down 2s infinite;
}

@keyframes bounce-down {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

.scroll-mouse {
  width: 24px;
  height: 38px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 14px;
  position: relative;
}

.scroll-wheel {
  width: 4px;
  height: 8px;
  background: var(--accent-light);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-wheel 1.5s infinite;
}

@keyframes scroll-wheel {
  0% { opacity: 1; top: 6px; }
  100% { opacity: 0; top: 22px; }
}

/* --- Section Layout --- */
section { padding: 6rem 0; position: relative; }

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-light);
  background: rgba(13, 148, 136, 0.1);
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.8;
}

.subsection-title {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 700;
  margin: 3rem 0 2rem;
}

/* --- About Section --- */
.about {
  background: var(--bg-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.about-card {
  text-align: center;
}

.about-card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.about-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--text-primary);
}

.about-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.about-list {
  text-align: left;
  padding: 0;
}

.about-list li {
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.25rem 0;
  padding-left: 1.2rem;
  position: relative;
}

.about-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-light);
  font-size: 0.7rem;
}

/* --- Research Section --- */
.research-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 5rem;
  padding: 2rem 0;
}

.research-block:last-child { margin-bottom: 0; }

.research-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  aspect-ratio: 16/10;
}

.research-video,
.research-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.research-info {
  position: relative;
}

.research-number {
  font-family: 'Orbitron', monospace;
  font-size: 5rem;
  font-weight: 900;
  color: rgba(13, 148, 136, 0.08);
  position: absolute;
  top: -2.5rem;
  left: -0.5rem;
  line-height: 1;
  pointer-events: none;
}

.research-info h3 {
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 0.8rem;
  position: relative;
  z-index: 1;
}

.research-highlight {
  font-size: 1.1rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.research-info p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.research-tags span {
  font-size: 0.75rem;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  background: rgba(13, 148, 136, 0.1);
  color: var(--accent-light);
  border: 1px solid rgba(13, 148, 136, 0.2);
}

.research-impact {
  font-size: 0.85rem;
  color: var(--gold-light);
  font-weight: 500;
  padding-left: 1rem;
  border-left: 2px solid var(--gold);
}

/* --- AI + Education Section --- */
.ai-education {
  background: var(--bg-secondary);
}

.transformation-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.flow-step {
  text-align: center;
  flex: 0 0 220px;
}

.flow-icon {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 1rem;
  border: 3px solid var(--accent);
  box-shadow: 0 0 30px var(--accent-glow);
  position: relative;
}

.flow-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.flow-content h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.flow-content p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.flow-arrow {
  font-size: 2rem;
  color: var(--accent-light);
  font-weight: 300;
}

.ai-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.ai-feature-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: var(--transition);
}

.ai-feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.ai-feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.ai-feature-card h4 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.ai-feature-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Course Cards --- */
.courses-preview {
  margin-top: 2rem;
}

.course-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.course-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.course-card:hover {
  transform: translateY(-4px);
  border-color: rgba(255,255,255,0.2);
  box-shadow: var(--shadow-md);
}

.course-card-img {
  height: 180px;
  overflow: hidden;
}

.course-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}

.course-card:hover .course-card-img img {
  transform: scale(1.05);
}

.course-card-body {
  padding: 1.5rem;
}

.course-card-body h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

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

.course-badge {
  font-size: 0.7rem;
  padding: 0.3rem 0.7rem;
  background: rgba(59, 130, 246, 0.15);
  color: var(--blue-light);
  border-radius: 50px;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

/* --- Hong Kong Cases --- */
.hk-cases {
  background: var(--bg-primary);
}

.case-card {
  margin-bottom: 4rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: var(--transition);
}

.case-card:hover {
  border-color: rgba(212, 168, 83, 0.3);
  box-shadow: 0 0 60px rgba(212, 168, 83, 0.05);
}

.case-card:last-child { margin-bottom: 2rem; }

.case-banner {
  position: relative;
  height: 360px;
  overflow: hidden;
}

.case-video-wrapper {
  position: absolute;
  inset: 0;
}

.case-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.5);
}

.case-banner-overlay {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  background: linear-gradient(0deg, rgba(10,15,26,0.8) 0%, rgba(10,15,26,0.2) 100%);
}

.case-number {
  font-family: 'Orbitron', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--gold-light);
  letter-spacing: 0.2em;
  margin-bottom: 0.8rem;
}

.case-banner-overlay h3 {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 1rem;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.case-school {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
}

.school-icon { font-size: 1.5rem; }

.school-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
}

.school-name-en {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.6);
  font-style: italic;
}

.case-details {
  padding: 2.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
}

.case-detail-block h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.8rem;
}

.case-detail-block p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.case-detail-block ul {
  padding: 0;
}

.case-detail-block ul li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 0.3rem 0;
  padding-left: 1.2rem;
  position: relative;
  line-height: 1.5;
}

.case-detail-block ul li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--accent-light);
}

.case-gallery {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}

.case-gallery img {
  border-radius: var(--radius-md);
  height: 200px;
  width: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.case-gallery img:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-md);
}

/* --- Testimonials --- */
.testimonials {
  margin-top: 1rem;
}

.testimonial-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.testimonial-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
}

.testimonial-quote {
  font-size: 4rem;
  font-family: Georgia, serif;
  color: var(--accent);
  opacity: 0.2;
  line-height: 1;
  position: absolute;
  top: 1rem;
  left: 1.5rem;
}

.testimonial-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  font-style: italic;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.testimonial-source {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: normal;
}

/* --- Programs Section --- */
.programs {
  background: var(--bg-secondary);
}

.programs-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.program-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.program-card:hover {
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-4px);
}

.program-card.featured {
  border-color: var(--accent);
  box-shadow: 0 0 30px var(--accent-glow);
}

.program-header {
  padding: 2rem 2rem 1rem;
  text-align: center;
}

.program-level {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-light);
  background: rgba(13, 148, 136, 0.1);
  padding: 0.3rem 1rem;
  border-radius: 50px;
  margin-bottom: 0.8rem;
  display: inline-block;
}

.program-header h3 {
  font-size: 1.4rem;
  font-weight: 700;
}

.program-body {
  padding: 0 2rem 1.5rem;
  flex: 1;
}

.program-body ul li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding: 0.35rem 0;
  padding-left: 1.2rem;
  position: relative;
  line-height: 1.4;
}

.program-body ul li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-light);
  font-size: 0.7rem;
}

.program-footer {
  padding: 1rem 2rem;
  border-top: 1px solid var(--border-glass);
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 700px;
  margin: 0 auto;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.feature-item:hover {
  border-color: rgba(255,255,255,0.15);
}

.feature-check {
  color: var(--accent-light);
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.feature-item strong {
  display: block;
  margin-bottom: 0.2rem;
}

.feature-item div {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* --- Achievements --- */
.achievements {
  background: var(--bg-primary);
  overflow: hidden;
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.achievement-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.achievement-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(13,148,136,0.05) 0%, transparent 70%);
  pointer-events: none;
}

.achievement-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.achievement-card.small {
  padding: 1.5rem 1rem;
}

.achievement-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.achievement-number {
  font-family: 'Orbitron', monospace;
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
  line-height: 1;
}

.achievement-card.small .achievement-number {
  font-size: 1.6rem;
}

.achievement-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.achievements-secondary {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
}

/* --- Science Video Section --- */
.science-video-section {
  background: var(--bg-secondary);
}

.highlight-video-wrapper {
  max-width: 900px;
  margin: 0 auto 3rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-glass);
}

.highlight-video {
  width: 100%;
  display: block;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.gallery-grid img {
  border-radius: var(--radius-md);
  aspect-ratio: 16/10;
  object-fit: cover;
  transition: var(--transition);
  width: 100%;
}

.gallery-grid img:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-md);
}

/* --- Official Media Section --- */
.official-media {
  background: var(--bg-secondary);
  padding-top: 0;
}

.official-video-wrapper {
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-glass);
  position: relative;
}

.official-video-wrapper::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: var(--gradient-primary);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  z-index: 1;
}

.official-video {
  width: 100%;
  display: block;
}

/* --- Contact Section --- */
.contact {
  background: var(--bg-primary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.contact-info-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.contact-item:hover {
  border-color: rgba(255,255,255,0.15);
}

.contact-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(13, 148, 136, 0.1);
  border-radius: var(--radius-sm);
}

.contact-item h4 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.contact-item p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.contact-form-card {
  padding: 2.5rem;
}

.contact-form-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 0.85rem 1.2rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  transition: var(--transition);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.contact-form select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

.contact-form select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.contact-form textarea {
  resize: vertical;
  min-height: 80px;
}

.contact-form .btn-primary {
  width: 100%;
  font-size: 1rem;
  padding: 1rem;
}

/* --- Footer --- */
.footer {
  background: #060a14;
  border-top: 1px solid var(--border-glass);
  padding: 4rem 0 2rem;
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: 2rem;
}

.footer-brand .logo-icon {
  font-size: 2rem;
}

.footer-brand h4 {
  font-size: 1rem;
  font-weight: 700;
}

.footer-brand p {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-style: italic;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-col h5 {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 0.3rem 0;
  transition: var(--transition);
}

.footer-col a:hover {
  color: var(--accent-light);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-glass);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-tagline {
  margin-top: 0.5rem;
  color: var(--accent) !important;
  letter-spacing: 0.1em;
}

.footer-partner {
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255,255,255,0.05);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.partner-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-light);
  font-weight: 500;
  transition: var(--transition);
}

.partner-brand:hover {
  color: #fff;
}

.partner-logo {
  height: 28px;
  width: auto;
  flex-shrink: 0;
}

.partner-note {
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.7;
}

/* --- Scroll Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.reveal-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* --- Responsive --- */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; }
  .research-block { grid-template-columns: 1fr; gap: 2rem; }
  .research-block.reverse { direction: ltr; }
  .research-block.reverse .research-media { order: -1; }
  .ai-features-grid { grid-template-columns: repeat(2, 1fr); }
  .course-cards { grid-template-columns: 1fr; }
  .case-details { grid-template-columns: 1fr; }
  .achievements-grid { grid-template-columns: repeat(3, 1fr); }
  .achievements-secondary { grid-template-columns: repeat(3, 1fr); }
  .programs-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .testimonial-cards { grid-template-columns: 1fr; }
  .transformation-flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }
  .hero-stats { gap: 1.5rem; }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(10, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 6rem 2rem 2rem;
    gap: 0.5rem;
    transition: right 0.4s ease;
    border-left: 1px solid var(--border-glass);
  }

  .nav-menu.active { right: 0; }

  .nav-link {
    font-size: 1.1rem;
    padding: 0.6rem 0;
    width: 100%;
  }

  .nav-toggle { display: flex; }

  .hero-title { font-size: 2.5rem; }
  .hero-subtitle { font-size: 1rem; }
  .section-title { font-size: 1.8rem; }

  .ai-features-grid { grid-template-columns: 1fr; }
  .achievements-grid { grid-template-columns: repeat(2, 1fr); }
  .achievements-secondary { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .case-gallery { grid-template-columns: 1fr; }
  .case-banner { height: 250px; }
  .case-banner-overlay h3 { font-size: 1.5rem; }
  .form-row { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; }
  .research-number { font-size: 3rem; top: -1.5rem; }

  section { padding: 4rem 0; }
}

@media (max-width: 480px) {
  .hero-stats { flex-direction: column; gap: 1rem; }
  .hero-cta { flex-direction: column; align-items: center; }
  .achievements-grid,
  .achievements-secondary { grid-template-columns: 1fr 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
}