:root {
  --primary-900: #0F172A;
  --primary-700: #1E3A8A;
  --primary-500: #3B82F6;
  --primary-300: #93C5FD;
  --accent-500: #D97706;
  --accent-400: #F59E0B;
  --accent-300: #FCD34D;
  --bg-primary: #F8FAFC;
  --bg-card: #FFFFFF;
  --bg-dark: #0F172A;
  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --text-white: #FFFFFF;
  --border: #E2E8F0;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 20px 40px rgba(0,0,0,0.15);
  --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.3);
  --shadow-accent: 0 0 40px rgba(217, 119, 6, 0.3);
  --radius: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --gradient-primary: linear-gradient(135deg, #1E3A8A 0%, #3B82F6 100%);
  --gradient-accent: linear-gradient(135deg, #D97706 0%, #F59E0B 100%);
  --gradient-dark: linear-gradient(135deg, #0F172A 0%, #1E3A8A 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
}

/* 平滑滚动 */
html { scroll-behavior: smooth; }

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

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

/* 全局动画入场效果 */
.fade-in-up {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.fade-in-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 科技感动画背景 */
.tech-bg { position: relative; overflow: hidden; }
.tech-bg::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(217, 119, 6, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
  pointer-events: none;
  animation: bgPulse 8s ease-in-out infinite;
}

@keyframes bgPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* 网格背景 */
.grid-bg {
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
}

/* 粒子动画效果 - 增强版 */
.particles { position: absolute; top: 0; left: 0; width: 100%; height: 100%; overflow: hidden; pointer-events: none; }
.particle {
  position: absolute;
  width: 4px; height: 4px;
  background: var(--primary-500);
  border-radius: 50%;
  opacity: 0.3;
  animation: float 15s infinite;
  box-shadow: 0 0 10px var(--primary-500);
}
.particle:nth-child(2n) { background: var(--accent-400); box-shadow: 0 0 10px var(--accent-400); }
.particle:nth-child(3n) { width: 6px; height: 6px; }

@keyframes float {
  0%, 100% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
  10% { opacity: 0.5; }
  90% { opacity: 0.5; }
  100% { transform: translateY(-100vh) rotate(720deg); opacity: 0; }
}

/* 导航 - 玻璃拟态增强版 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.navbar.scrolled {
  background: rgba(255,255,255,0.95);
  box-shadow: 0 4px 30px rgba(0,0,0,0.1);
}
.nav-container { display: flex; justify-content: space-between; align-items: center; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 700; color: var(--primary-900); text-decoration: none; }
.logo img { height: 40px; transition: transform 0.3s; }
.logo:hover img { transform: scale(1.05) rotate(-3deg); }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s;
  font-size: 15px;
  position: relative;
  padding: 8px 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--gradient-accent);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  transform: translateX(-50%);
  border-radius: 2px;
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a:hover, .nav-links a.active { color: var(--primary-900); }

.dropdown { position: relative; }
.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 8px 0;
  min-width: 200px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
  margin-top: 16px;
  animation: dropIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
@keyframes dropIn {
  from { opacity: 0; transform: translateY(-10px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.dropdown:hover .dropdown-content { display: block; }
.dropdown-content a { display: block; padding: 12px 20px; color: var(--text-secondary); font-size: 14px; transition: all 0.2s; }
.dropdown-content a:hover { background: var(--bg-primary); color: var(--primary-500); padding-left: 24px; }
.dropdown-content .highlight { font-weight: 700; color: var(--accent-500); }

/* 按钮 - 增强版 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: none;
  font-size: 14px;
  position: relative;
  overflow: hidden;
}
.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}
.btn:hover::before { width: 400px; height: 400px; }
.btn-primary {
  background: var(--gradient-accent);
  color: white;
  box-shadow: 0 4px 20px rgba(217,119,6,0.4);
}
.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 30px rgba(217,119,6,0.5);
}
.btn-primary:active {
  transform: translateY(-1px) scale(0.98);
}
.btn-secondary {
  background: white;
  color: var(--primary-900);
  border: 2px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--primary-500);
  color: var(--primary-500);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.2);
}
.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: white;
  color: var(--primary-900);
  border-color: white;
  transform: translateY(-2px);
}

/* 语言切换 */
.lang-switch { display: flex; align-items: center; gap: 4px; margin-left: 24px; }
.lang-switch button {
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 14px;
  padding: 6px 12px;
  border-radius: var(--radius);
  transition: all 0.2s;
}
.lang-switch button:hover { color: var(--primary-500); background: rgba(59, 130, 246, 0.1); }
.lang-switch button.active { color: var(--accent-500); background: rgba(217, 119, 6, 0.1); }

/* Hero - 超级增强版 */
.hero {
  padding: 160px 0 100px;
  background: var(--gradient-dark);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background:
    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='%23ffffff' 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") repeat,
    linear-gradient(180deg, transparent 0%, rgba(15,23,42,0.5) 100%);
  opacity: 0.5;
}

/* 光晕装饰 */
.hero::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
              radial-gradient(circle at 70% 70%, rgba(217, 119, 6, 0.1) 0%, transparent 50%);
  animation: heroGlow 15s ease-in-out infinite;
  pointer-events: none;
}

@keyframes heroGlow {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  50% { transform: translate(-5%, 5%) rotate(180deg); }
}

.hero h1 {
  font-size: 56px;
  margin-bottom: 20px;
  font-weight: 800;
  position: relative;
  line-height: 1.2;
  animation: fadeInUp 1s cubic-bezier(0.16, 1, 0.3, 1);
  text-shadow: 0 4px 30px rgba(0,0,0,0.3);
  background: linear-gradient(135deg, #fff 0%, rgba(255,255,255,0.9) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .subtitle {
  font-size: 26px;
  opacity: 0.95;
  margin-bottom: 16px;
  font-weight: 500;
  position: relative;
  animation: fadeInUp 1s 0.1s backwards;
}
.hero .desc {
  font-size: 16px;
  opacity: 0.8;
  margin-bottom: 40px;
  position: relative;
  animation: fadeInUp 1s 0.2s backwards;
}
@keyframes fadeInUp { from { opacity: 0; transform: translateY(40px); } to { opacity: 1; transform: translateY(0); } }

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin: 50px 0;
  position: relative;
  animation: fadeInUp 1s 0.3s backwards;
}
.stat-item {
  text-align: center;
  padding: 28px 32px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}
.stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.5s;
}
.stat-item:hover::before {
  left: 100%;
}
.stat-item:hover {
  transform: translateY(-8px) scale(1.02);
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}
.stat-item .number {
  display: block;
  font-size: 48px;
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-item .label { font-size: 14px; opacity: 0.8; margin-top: 8px; }
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 40px;
  position: relative;
  animation: fadeInUp 1s 0.4s backwards;
}

/* 合作企业滚动 - 增强版 */
.partners-section {
  padding: 100px 0;
  background: var(--bg-primary);
  position: relative;
}
.partners-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}
.partners-title { text-align: center; margin-bottom: 50px; }
.partners-title h2 { font-size: 36px; font-weight: 700; color: var(--primary-900); }
.partners-title p { color: var(--text-secondary); margin-top: 12px; font-size: 16px; }
.partners-marquee { overflow: hidden; padding: 30px 0; position: relative; }
.partners-marquee::before, .partners-marquee::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 150px;
  z-index: 1;
  pointer-events: none;
}
.partners-marquee::before {
  left: 0;
  background: linear-gradient(90deg, var(--bg-primary), transparent);
}
.partners-marquee::after {
  right: 0;
  background: linear-gradient(-90deg, var(--bg-primary), transparent);
}
.partners-track { display: flex; animation: marquee 40s linear infinite; gap: 30px; }
.partners-track:hover { animation-play-state: paused; }
@keyframes marquee { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
.partner-logo {
  flex-shrink: 0;
  width: 160px; height: 80px;
  background: white;
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  font-weight: 600;
  color: var(--primary-900);
  font-size: 13px;
  text-align: center;
  padding: 10px;
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.partner-logo::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s;
}
.partner-logo:hover {
  transform: translateY(-5px) scale(1.05);
  box-shadow: 0 20px 40px rgba(59, 130, 246, 0.15);
  border-color: var(--primary-500);
}
.partner-logo:hover::before {
  opacity: 0.03;
}
.partner-logo .type { display: block; font-size: 10px; color: var(--text-secondary); font-weight: 400; margin-top: 4px; }

/* 中国地图 - 增强版 */
.map-section { padding: 100px 0; background: white; position: relative; }
.map-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
}
.map-container { display: grid; grid-template-columns: 280px 1fr 280px; gap: 40px; margin-top: 50px; }
.map-sidebar {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 28px;
  height: fit-content;
  border: 1px solid var(--border);
}
.map-sidebar h3 { font-size: 18px; margin-bottom: 24px; color: var(--primary-900); display: flex; align-items: center; gap: 10px; }
.city-list { display: flex; flex-direction: column; gap: 12px; }
.city-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: white;
  border-radius: var(--radius);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: 1px solid transparent;
}
.city-item:hover {
  transform: translateX(8px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  border-color: var(--primary-500);
}
.city-item.negotiating { border-left: 4px solid var(--accent-500); }
.city-item.top { border-left: 4px solid var(--primary-500); }
.city-rank {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}
.city-item.negotiating .city-rank { background: var(--gradient-accent); box-shadow: 0 4px 10px rgba(217, 119, 6, 0.3); }
.city-name { font-weight: 500; }
.city-score { font-size: 12px; color: var(--text-secondary); margin-left: auto; }
.progress-bar { width: 100%; height: 6px; background: var(--border); border-radius: 3px; margin-top: 10px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--gradient-accent); border-radius: 3px; transition: width 1.5s cubic-bezier(0.16, 1, 0.3, 1); }

#china-map { height: 500px; border-radius: var(--radius-xl); background: var(--bg-primary); border: 1px solid var(--border); }
.map-legend { display: flex; justify-content: center; gap: 40px; margin-top: 30px; }
.legend-item { display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 500; }
.legend-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  box-shadow: 0 0 10px currentColor;
}
.legend-dot.hq { background: var(--accent-500); color: var(--accent-500); }
.legend-dot.branch { background: var(--primary-500); color: var(--primary-500); }
.legend-dot.negotiating { background: var(--accent-400); color: var(--accent-400); }

/* 课程卡片 - 超级增强版 */
.courses-section { padding: 100px 0; background: var(--bg-primary); }
.courses-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; margin-top: 50px; }
.course-card {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 4px 30px rgba(0,0,0,0.08);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
}
.course-card:hover {
  transform: translateY(-12px) scale(1.02);
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}
.course-card.featured {
  border: 2px solid var(--accent-500);
  box-shadow: 0 0 0 4px rgba(217, 119, 6, 0.1);
}
.course-card.featured:hover {
  box-shadow: 0 20px 60px rgba(217, 119, 6, 0.2), 0 0 0 4px rgba(217, 119, 6, 0.2);
}
.course-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  background: var(--gradient-accent);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(217, 119, 6, 0.4);
  animation: badgePulse 2s ease-in-out infinite;
}
@keyframes badgePulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
.course-header {
  background: var(--gradient-primary);
  color: white;
  padding: 36px;
  position: relative;
  overflow: hidden;
}
.course-header::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
}
.course-header h3 { font-size: 28px; margin-bottom: 12px; position: relative; }
.course-header .price { font-size: 42px; font-weight: 800; background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.course-header .price-original { font-size: 20px; color: rgba(255,255,255,0.5); text-decoration: line-through; margin-left: 12px; }
.course-header .promo { display: inline-block; background: var(--accent-500); color: white; padding: 6px 14px; border-radius: 20px; font-size: 12px; margin-left: 12px; }
.course-body { padding: 36px; }
.course-info { display: flex; gap: 24px; margin-bottom: 24px; }
.course-info-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--text-secondary);
  padding: 8px 16px;
  background: var(--bg-primary);
  border-radius: 20px;
}
.course-features { list-style: none; margin-bottom: 24px; }
.course-features li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  transition: all 0.3s;
}
.course-features li:hover {
  padding-left: 8px;
  color: var(--primary-500);
}
.course-features li::before {
  content: '✓';
  color: white;
  background: var(--gradient-primary);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
}

/* 学员风采 - 增强版 */
.students-section { padding: 100px 0; background: var(--bg-primary); }
.students-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 50px; }
.student-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 1;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
.student-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.8) 100%);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1;
}
.student-card:hover::before {
  opacity: 1;
}
.student-card img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.student-card:hover img { transform: scale(1.15); }
.student-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px;
  color: white;
  transform: translateY(100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 2;
}
.student-card:hover .student-overlay { transform: translateY(0); }
.student-card:hover {
  box-shadow: 0 20px 50px rgba(0,0,0,0.2);
}

/* 学员作品 - 增强版 */
.works-section { padding: 100px 0; background: white; }
.works-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; margin-top: 50px; }
.work-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.work-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}
.work-thumbnail { position: relative; aspect-ratio: 16/9; overflow: hidden; }
.work-thumbnail img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s; }
.work-card:hover .work-thumbnail img { transform: scale(1.1); }
.work-play {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 70px;
  height: 70px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-900);
  font-size: 24px;
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.work-card:hover .work-play {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.work-info { padding: 24px; }
.work-title { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.work-author { font-size: 14px; color: var(--text-secondary); }
.work-stats { display: flex; gap: 20px; margin-top: 16px; font-size: 13px; color: var(--text-secondary); }

/* 师资 - 增强版 */
.teachers-section { padding: 100px 0; background: var(--bg-primary); }
.teachers-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 28px; margin-top: 50px; }
.teacher-card {
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  text-align: center;
  position: relative;
}
.teacher-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s;
}
.teacher-card:hover::after {
  opacity: 1;
}
.teacher-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}
.teacher-avatar {
  width: 100%;
  height: 200px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.teacher-avatar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='40' height='40' viewBox='0 0 40 40' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M20 20.5V18H0v-2h20v-2l4 3.5-4 3.5zM0 20h2v20H0V20zm4 0h2v20H4V20zm4 0h2v20H8V20z' fill='%23ffffff' fill-opacity='0.05' fill-rule='evenodd'/%3E%3C/svg%3E");
  opacity: 0.5;
}
.teacher-avatar img { width: 100%; height: 100%; object-fit: cover; }
.teacher-avatar-placeholder { font-size: 56px; color: white; text-shadow: 0 4px 20px rgba(0,0,0,0.2); }
.teacher-info { padding: 24px; }
.teacher-name { font-size: 20px; font-weight: 600; margin-bottom: 6px; }
.teacher-title { font-size: 14px; color: var(--accent-500); margin-bottom: 12px; font-weight: 500; }
.teacher-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

/* 分公司画廊 - 增强版 */
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px; }
.gallery-item {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4/3;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.gallery-item:hover img { transform: scale(1.15); }
.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px;
  background: linear-gradient(transparent, rgba(0,0,0,0.9));
  color: white;
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.3s;
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-item:hover {
  box-shadow: 0 20px 50px rgba(0,0,0,0.2);
}

/* AI体验区 - 增强版 */
.ai-experience {
  padding: 100px 0;
  background: var(--gradient-dark);
  color: white;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.ai-experience::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
  pointer-events: none;
}
.ai-experience h2 {
  position: relative;
  font-size: 36px;
}
.ai-demo {
  max-width: 650px;
  margin: 50px auto 0;
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-xl);
  padding: 48px;
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  position: relative;
}
.ai-demo::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 2px;
  background: var(--gradient-accent);
  border-radius: 2px;
}
.ai-demo h3 { font-size: 26px; margin-bottom: 20px; }
.ai-input {
  width: 100%;
  padding: 18px 24px;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 15px;
  margin-bottom: 20px;
  background: white;
  color: var(--text-primary);
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
  transition: all 0.3s;
}
.ai-input:focus {
  outline: none;
  box-shadow: 0 4px 30px rgba(59, 130, 246, 0.3);
}
.ai-output {
  min-height: 220px;
  background: rgba(0,0,0,0.3);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: left;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  line-height: 2;
  border: 1px solid rgba(255,255,255,0.05);
}
.typing-cursor { animation: blink 1s infinite; color: var(--accent-400); }
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }

/* 页脚 - 增强版 */
footer {
  background: var(--primary-900);
  color: white;
  padding: 80px 0 32px;
  margin-top: 100px;
  position: relative;
}
footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 60px; margin-bottom: 50px; }
.footer-brand p { opacity: 0.7; font-size: 14px; margin-top: 20px; line-height: 1.9; }
.footer-links h4 { margin-bottom: 24px; font-size: 16px; font-weight: 600; }
.footer-links a {
  display: block;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  margin-bottom: 12px;
  font-size: 14px;
  transition: all 0.3s;
}
.footer-links a:hover { color: var(--accent-400); padding-left: 5px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 32px;
  text-align: center;
  opacity: 0.5;
  font-size: 14px;
}

/* 响应式 */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }
  .map-container { grid-template-columns: 1fr; }
  .map-sidebar { display: none; }
  .teachers-grid { grid-template-columns: repeat(4, 1fr); }
  .hero h1 { font-size: 44px; }
  .courses-grid { gap: 30px; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 120px 0 60px; }
  .hero h1 { font-size: 32px; }
  .hero .subtitle { font-size: 18px; }
  .hero-stats { flex-direction: column; gap: 16px; }
  .hero-cta { flex-direction: column; padding: 0 24px; }
  .courses-grid { grid-template-columns: 1fr; }
  .students-grid { grid-template-columns: repeat(2, 1fr); }
  .works-grid { grid-template-columns: repeat(2, 1fr); }
  .teachers-grid { grid-template-columns: repeat(3, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; text-align: center; gap: 30px; }
  .partners-title h2, .ai-experience h2 { font-size: 28px; }
}
@media (max-width: 480px) {
  .students-grid, .works-grid, .gallery-grid { grid-template-columns: 1fr; }
  .teachers-grid { grid-template-columns: repeat(2, 1fr); }
  .container { padding: 0 16px; }
  .hero h1 { font-size: 28px; }
  .stat-item .number { font-size: 36px; }
  .course-header .price { font-size: 32px; }
}