/* ============================================
   燕园寻迹 - 网站样式 v2.0
   设计风格：迪士尼/环球度假区 - 清晰明快、充满活力
   ============================================ */

/* --- CSS 变量 --- */
:root {
  --primary-color: #C41E3A;
  --primary-dark: #9B1B30;
  --primary-light: #E8435A;
  --secondary-color: #1A73B5;
  --accent-gold: #F5A623;
  --accent-teal: #00897B;
  --accent-purple: #7C4DFF;
  --accent-orange: #FF6D00;
  --background-color: #FAFBFE;
  --card-background: #FFFFFF;
  --section-warm: #FFF8F0;
  --section-cool: #F0F7FF;
  --section-green: #F0FAF5;
  --text-primary: #1A1A2E;
  --text-secondary: #4A4A6A;
  --text-light: #8E8EA0;
  --text-on-primary: #FFFFFF;
  --border-color: #E8ECF0;
  --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
  --shadow-md: 0 4px 20px rgba(26, 26, 46, 0.08);
  --shadow-lg: 0 8px 40px rgba(26, 26, 46, 0.12);
  --shadow-glow: 0 0 30px rgba(196, 30, 58, 0.15);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  --max-width: 1280px;
  --header-height: 72px;
  --nav-blur: 20px;
}

/* --- 全局重置 --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: var(--primary-color); text-decoration: none; transition: all 0.3s ease; }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; display: block; }

/* --- 导航栏 --- */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(var(--nav-blur));
  -webkit-backdrop-filter: blur(var(--nav-blur));
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px; z-index: 1000; transition: all 0.3s ease;
}
.navbar.scrolled { box-shadow: var(--shadow-md); }
.navbar-brand {
  display: flex; align-items: center; gap: 12px;
  color: var(--text-primary); font-size: 22px; font-weight: 800;
}
.navbar-brand .brand-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-purple));
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  color: white; font-size: 20px; box-shadow: 0 4px 12px rgba(196, 30, 58, 0.3);
}
.navbar-brand span:last-child {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.navbar-nav { display: flex; gap: 4px; list-style: none; align-items: center; }
.navbar-nav a {
  color: var(--text-secondary); padding: 8px 18px; border-radius: var(--radius-full);
  font-size: 15px; font-weight: 500; transition: all 0.3s ease;
}
.navbar-nav a:hover { color: var(--primary-color); background: rgba(196, 30, 58, 0.06); }
.navbar-nav a.active { color: var(--primary-color); background: rgba(196, 30, 58, 0.1); font-weight: 600; }

/* 导航栏登录/注册按钮 */
.nav-auth { display: flex; align-items: center; gap: 6px; margin-left: 8px; }
.nav-login { color: var(--text-secondary) !important; }
.nav-register {
  background: var(--primary-color) !important; color: white !important;
  padding: 8px 20px !important; font-weight: 600 !important;
}
.nav-register:hover { background: var(--primary-dark) !important; color: white !important; }
.nav-user { display: flex; align-items: center; gap: 6px; font-weight: 600 !important; color: var(--primary-color) !important; }
.nav-avatar {
  width: 28px; height: 28px; border-radius: 50%; background: var(--primary-color);
  color: white; display: inline-flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700;
}
.navbar-toggle {
  display: none; background: none; border: none; color: var(--text-primary);
  font-size: 24px; cursor: pointer; padding: 8px; border-radius: var(--radius-sm);
}

/* --- 容器 --- */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.page-container { padding-top: var(--header-height); min-height: 100vh; }

/* --- 按钮 --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 32px; border-radius: var(--radius-full); font-size: 15px; font-weight: 600;
  border: none; cursor: pointer; transition: all 0.3s ease; position: relative; overflow: hidden;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(rgba(255,255,255,0.2), transparent); opacity: 0; transition: opacity 0.3s;
}
.btn:hover::after { opacity: 1; }
.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: var(--text-on-primary); box-shadow: 0 4px 16px rgba(196, 30, 58, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(196, 30, 58, 0.4); color: var(--text-on-primary); }
.btn-secondary {
  background: white; color: var(--primary-color); border: 2px solid var(--primary-color);
}
.btn-secondary:hover { background: var(--primary-color); color: white; transform: translateY(-2px); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.2); color: white; border: 2px solid rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.3); border-color: white; color: white; transform: translateY(-2px); }
.btn-accent {
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-orange));
  color: white; box-shadow: 0 4px 16px rgba(245, 166, 35, 0.3);
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(245, 166, 35, 0.4); color: white; }
.btn-sm { padding: 8px 20px; font-size: 13px; }
.btn-lg { padding: 16px 40px; font-size: 17px; }

/* --- 首页 Hero --- */
.hero {
  position: relative; min-height: 600px; display: flex; align-items: center; overflow: hidden;
  background: linear-gradient(135deg, #1A1A2E 0%, #2D1B4E 30%, #C41E3A 70%, #E8435A 100%);
  padding: 120px 0 80px;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%; width: 800px; height: 800px;
  background: radial-gradient(circle, rgba(245, 166, 35, 0.15) 0%, transparent 70%);
  border-radius: 50%; animation: float 8s ease-in-out infinite;
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -10%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(124, 77, 255, 0.1) 0%, transparent 70%);
  border-radius: 50%; animation: float 10s ease-in-out infinite reverse;
}
@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}
.hero-content { position: relative; z-index: 2; max-width: 640px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, 0.12); backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2); padding: 6px 16px;
  border-radius: var(--radius-full); color: rgba(255, 255, 255, 0.9);
  font-size: 13px; font-weight: 500; margin-bottom: 24px;
}
.hero-badge .dot {
  width: 8px; height: 8px; background: #4ADE80; border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero h1 {
  font-size: 56px; font-weight: 900; color: white; line-height: 1.15;
  margin-bottom: 20px; letter-spacing: -0.5px;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent-gold), #FFD700);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero .hero-desc { font-size: 18px; color: rgba(255, 255, 255, 0.8); margin-bottom: 36px; line-height: 1.8; max-width: 520px; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 40px; margin-top: 48px; padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}
.hero-stat { text-align: left; }
.hero-stat-value { font-size: 32px; font-weight: 800; color: white; line-height: 1; }
.hero-stat-label { font-size: 13px; color: rgba(255, 255, 255, 0.6); margin-top: 4px; }
.hero-visual { position: absolute; right: 5%; top: 50%; transform: translateY(-50%); width: 480px; height: 480px; z-index: 1; }
.hero-card-stack { position: relative; width: 100%; height: 100%; }
.hero-card {
  position: absolute; border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3); transition: transform 0.5s ease;
}
.hero-card-1 { width: 280px; height: 360px; top: 10%; left: 10%; transform: rotate(-6deg); background: linear-gradient(135deg, #667eea, #764ba2); z-index: 3; }
.hero-card-2 { width: 260px; height: 340px; top: 15%; right: 5%; transform: rotate(4deg); background: linear-gradient(135deg, #f093fb, #f5576c); z-index: 2; }
.hero-card-3 { width: 240px; height: 320px; bottom: 5%; left: 25%; transform: rotate(-2deg); background: linear-gradient(135deg, #4facfe, #00f2fe); z-index: 1; }
.hero-card-inner {
  width: 100%; height: 100%; display: flex; flex-direction: column; justify-content: flex-end;
  padding: 24px; background: linear-gradient(transparent 40%, rgba(0,0,0,0.6));
}
.hero-card-inner .card-emoji { font-size: 48px; margin-bottom: 12px; }
.hero-card-inner .card-title { color: white; font-size: 18px; font-weight: 700; }
.hero-card-inner .card-sub { color: rgba(255, 255, 255, 0.7); font-size: 13px; margin-top: 4px; }

/* --- 板块 --- */
.section { padding: 80px 0; }
.section-header { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 40px; }
.section-eyebrow { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 2px; color: var(--primary-color); }
.section-title { font-size: 32px; font-weight: 800; color: var(--text-primary); line-height: 1.2; }
.section-link {
  display: inline-flex; align-items: center; gap: 6px; color: var(--primary-color);
  font-size: 15px; font-weight: 600; padding: 8px 0; border-bottom: 2px solid transparent; transition: all 0.3s;
}
.section-link:hover { border-bottom-color: var(--primary-color); }
.section-link .arrow { transition: transform 0.3s; }
.section-link:hover .arrow { transform: translateX(4px); }

/* --- 建筑卡片网格 --- */
.building-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 28px; }
.building-card {
  background: var(--card-background); border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm); transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer; text-decoration: none; color: inherit; border: 1px solid var(--border-color);
}
.building-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; color: inherit; }
.building-card-image { position: relative; height: 220px; overflow: hidden; }
.building-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.building-card:hover .building-card-image img { transform: scale(1.08); }
.building-card-image .card-gradient {
  position: absolute; bottom: 0; left: 0; right: 0; height: 80px;
  background: linear-gradient(transparent, rgba(0,0,0,0.4));
}
.building-card-image .card-emoji-overlay {
  position: absolute; top: 16px; right: 16px; width: 48px; height: 48px;
  background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(10px); border-radius: 14px;
  display: flex; align-items: center; justify-content: center; font-size: 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.building-card-image .card-category-badge {
  position: absolute; bottom: 12px; left: 16px; padding: 4px 14px;
  border-radius: var(--radius-full); font-size: 12px; font-weight: 600;
  color: white; backdrop-filter: blur(10px);
}
.badge-landmark { background: rgba(196, 30, 58, 0.85); }
.badge-garden { background: rgba(0, 137, 123, 0.85); }
.badge-library { background: rgba(26, 115, 181, 0.85); }
.badge-museum { background: rgba(124, 77, 255, 0.85); }
.badge-teaching { background: rgba(245, 166, 35, 0.85); }
.badge-sports { background: rgba(255, 109, 0, 0.85); }
.badge-canteen { background: rgba(233, 30, 99, 0.85); }
.badge-dorm { background: rgba(103, 58, 183, 0.85); }
.badge-admin { background: rgba(96, 125, 139, 0.85); }
.badge-other { background: rgba(120, 120, 140, 0.85); }
.building-card-body { padding: 20px 24px 24px; }
.building-card-title { font-size: 19px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; transition: color 0.3s; }
.building-card:hover .building-card-title { color: var(--primary-color); }
.building-card-desc {
  font-size: 14px; color: var(--text-secondary); display: -webkit-box;
  -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.7;
}
.building-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border-color);
}
.building-card-meta { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--text-light); }
.building-card-meta .meta-item { display: flex; align-items: center; gap: 4px; }
.building-card-arrow {
  width: 36px; height: 36px; border-radius: 50%; background: var(--section-cool);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-color); font-size: 14px; transition: all 0.3s;
}
.building-card:hover .building-card-arrow { background: var(--primary-color); color: white; transform: translateX(4px); }

/* --- 精选建筑大卡片 --- */
.featured-grid { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: auto auto; gap: 28px; }
.featured-card {
  position: relative; border-radius: var(--radius-lg); overflow: hidden; min-height: 320px;
  display: flex; align-items: flex-end; box-shadow: var(--shadow-md);
  transition: all 0.4s ease; cursor: pointer; text-decoration: none; color: inherit;
}
.featured-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); color: inherit; }
.featured-card.large { grid-row: span 2; min-height: 668px; }
.featured-card-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  transition: transform 0.6s ease;
}
.featured-card:hover .featured-card-bg { transform: scale(1.05); }
.featured-card-overlay { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 30%, rgba(0, 0, 0, 0.7) 100%); }
.featured-card-content { position: relative; z-index: 2; padding: 32px; width: 100%; }
.featured-card-emoji { font-size: 40px; margin-bottom: 12px; }
.featured-card-title { font-size: 24px; font-weight: 800; color: white; margin-bottom: 8px; }
.featured-card.large .featured-card-title { font-size: 32px; }
.featured-card-desc {
  font-size: 14px; color: rgba(255, 255, 255, 0.8); line-height: 1.7;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.featured-card-tag {
  display: inline-block; padding: 4px 14px; border-radius: var(--radius-full);
  font-size: 12px; font-weight: 600; color: white; margin-top: 12px;
  backdrop-filter: blur(10px); background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

/* --- 分类横滑 --- */
.category-scroll { display: flex; gap: 12px; overflow-x: auto; padding-bottom: 8px; -ms-overflow-style: none; scrollbar-width: none; }
.category-scroll::-webkit-scrollbar { display: none; }
.category-chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 10px 22px;
  border-radius: var(--radius-full); font-size: 14px; font-weight: 600;
  white-space: nowrap; transition: all 0.3s; border: 2px solid var(--border-color);
  background: var(--card-background); color: var(--text-secondary); text-decoration: none;
}
.category-chip:hover { border-color: var(--primary-color); color: var(--primary-color); background: rgba(196, 30, 58, 0.04); }
.category-chip.active { background: var(--primary-color); color: white; border-color: var(--primary-color); box-shadow: 0 4px 12px rgba(196, 30, 58, 0.25); }

/* --- 建筑详情页 Hero --- */
.building-hero { position: relative; height: 500px; overflow: hidden; margin-top: calc(-1 * var(--header-height)); }
.building-hero img { width: 100%; height: 100%; object-fit: cover; }
.building-hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.6) 60%, rgba(0,0,0,0.85) 100%);
  display: flex; align-items: flex-end; padding: 60px 0;
}
.building-hero-content { position: relative; z-index: 2; }
.building-hero-breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: rgba(255, 255, 255, 0.7); margin-bottom: 16px; }
.building-hero-breadcrumb a { color: rgba(255, 255, 255, 0.7); }
.building-hero-breadcrumb a:hover { color: white; }
.building-hero h1 { font-size: 44px; font-weight: 900; color: white; margin-bottom: 16px; text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3); }
.building-hero-tags { display: flex; gap: 10px; flex-wrap: wrap; }
.building-hero-tag {
  display: inline-flex; align-items: center; gap: 6px; padding: 6px 16px;
  border-radius: var(--radius-full); font-size: 13px; font-weight: 500;
  color: white; background: rgba(255, 255, 255, 0.15); backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* --- 建筑详情布局 --- */
.building-detail-layout { display: grid; grid-template-columns: 1fr 380px; gap: 40px; margin-top: -60px; position: relative; z-index: 10; }
.building-main {
  background: var(--card-background); border-radius: var(--radius-xl);
  padding: 40px; box-shadow: var(--shadow-md); border: 1px solid var(--border-color);
}
.building-sidebar { display: flex; flex-direction: column; gap: 24px; }
.sidebar-card {
  background: var(--card-background); border-radius: var(--radius-lg);
  padding: 24px; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); transition: all 0.3s;
}
.sidebar-card:hover { box-shadow: var(--shadow-md); }
.sidebar-card h4 {
  font-size: 14px; font-weight: 700; color: var(--text-light);
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px;
  display: flex; align-items: center; gap: 8px;
}
.sidebar-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.7; }

/* --- 建筑详情内容区 --- */
.building-section { margin-bottom: 40px; }
.building-section:last-child { margin-bottom: 0; }
.building-section-header {
  display: flex; align-items: center; gap: 12px; margin-bottom: 20px;
  padding-bottom: 16px; border-bottom: 2px solid var(--border-color);
}
.building-section-icon {
  width: 40px; height: 40px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0;
}
.building-section-header h2 { font-size: 22px; font-weight: 700; color: var(--text-primary); }
.building-section p { font-size: 16px; color: var(--text-secondary); line-height: 1.9; }

/* --- 故事卡片 --- */
.story-card {
  padding: 24px; background: var(--section-warm); border-radius: var(--radius-md);
  margin-bottom: 20px; border-left: 4px solid var(--accent-gold); transition: all 0.3s;
}
.story-card:hover { background: #FFF3E8; transform: translateX(4px); }
.story-card h3 { font-size: 17px; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }
.story-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; }

/* --- 标签 --- */
.tag { display: inline-block; padding: 4px 14px; border-radius: var(--radius-full); font-size: 13px; font-weight: 500; }
.tag-red { background: rgba(196, 30, 58, 0.1); color: var(--primary-color); }
.tag-blue { background: rgba(26, 115, 181, 0.1); color: var(--secondary-color); }
.tag-green { background: rgba(0, 137, 123, 0.1); color: var(--accent-teal); }
.tag-gold { background: rgba(245, 166, 35, 0.1); color: var(--accent-gold); }
.tag-purple { background: rgba(124, 77, 255, 0.1); color: var(--accent-purple); }

/* --- 相关建筑 --- */
.related-card {
  display: flex; align-items: center; gap: 14px; padding: 12px;
  border-radius: var(--radius-md); transition: all 0.3s;
  text-decoration: none; color: inherit; margin-bottom: 8px;
}
.related-card:hover { background: var(--section-cool); color: inherit; }
.related-card-image {
  width: 52px; height: 52px; border-radius: 12px; overflow: hidden; flex-shrink: 0;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex; align-items: center; justify-content: center; font-size: 24px;
}
.related-card-image img { width: 100%; height: 100%; object-fit: cover; }
.related-card-name { font-size: 15px; font-weight: 600; color: var(--text-primary); }
.related-card-cat { font-size: 12px; color: var(--text-light); margin-top: 2px; }

/* --- 空状态 --- */
.empty-state { text-align: center; padding: 80px 20px; }
.empty-icon { font-size: 64px; margin-bottom: 20px; }
.empty-state h3 { font-size: 22px; font-weight: 700; color: var(--text-primary); margin-bottom: 10px; }

/* --- 核心功能入口卡片 --- */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 20px; }
.feature-card {
  display: flex; align-items: center; gap: 20px;
  background: var(--card-background); border-radius: var(--radius-lg);
  padding: 24px 28px; box-shadow: var(--shadow-sm); border: 1px solid var(--border-color);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  cursor: pointer; text-decoration: none; color: inherit;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; color: inherit; }
.feature-card-icon {
  width: 56px; height: 56px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; flex-shrink: 0; color: white;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.feature-card-body { flex: 1; min-width: 0; }
.feature-card-body h3 { font-size: 17px; font-weight: 700; color: var(--text-primary); margin-bottom: 4px; }
.feature-card-body p { font-size: 14px; color: var(--text-light); line-height: 1.5; margin: 0; }
.feature-card-arrow {
  width: 36px; height: 36px; border-radius: 50%; background: var(--section-cool);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary-color); font-size: 14px; transition: all 0.3s; flex-shrink: 0;
}
.feature-card:hover .feature-card-arrow { background: var(--primary-color); color: white; transform: translateX(4px); }

/* --- CTA 横幅 --- */
.cta-banner {
  background: linear-gradient(135deg, #1A1A2E 0%, #2D1B4E 50%, #C41E3A 100%);
  padding: 80px 0; text-align: center; color: white;
}
.cta-banner h2 { font-size: 32px; font-weight: 800; margin-bottom: 12px; }
.cta-banner p { font-size: 17px; opacity: 0.8; margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* --- 响应式 --- */
@media (max-width: 768px) {
  .hero { min-height: auto; padding: 100px 0 60px; }
  .hero h1 { font-size: 36px; }
  .hero-visual { display: none; }
  .hero-stats { gap: 24px; }
  .hero-stat-value { font-size: 24px; }
  .building-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .building-detail-layout { grid-template-columns: 1fr; }
  .navbar-nav { display: none; }
  .navbar-nav.show { display: flex; flex-direction: column; position: absolute; top: var(--header-height); left: 0; right: 0; background: white; padding: 16px; box-shadow: var(--shadow-md); }
  .navbar-toggle { display: block; }
  .explore-grid { grid-template-columns: 1fr; }
}
.empty-state p { font-size: 15px; color: var(--text-light); }

/* --- 探索入口网格 --- */
.explore-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 20px; margin: 60px 0; }
.explore-card {
  position: relative; border-radius: var(--radius-lg); overflow: hidden; min-height: 180px;
  display: flex; align-items: flex-end; text-decoration: none; color: inherit;
  transition: all 0.4s ease; box-shadow: var(--shadow-sm);
}
.explore-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); color: inherit; }
.explore-card-bg { position: absolute; inset: 0; transition: transform 0.5s ease; }
.explore-card:hover .explore-card-bg { transform: scale(1.05); }
.explore-card-content { position: relative; z-index: 2; padding: 24px; width: 100%; }
.explore-card-icon { font-size: 32px; margin-bottom: 8px; }
.explore-card-title { font-size: 17px; font-weight: 700; color: white; }
.explore-card-count { font-size: 13px; color: rgba(255, 255, 255, 0.7); margin-top: 4px; }

/* --- CTA 横幅 --- */
.cta-banner {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-purple));
  border-radius: var(--radius-xl); padding: 60px; text-align: center;
  color: white; margin: 60px 0; position: relative; overflow: hidden;
}
.cta-banner::before {
  content: ''; position: absolute; top: -50%; right: -20%; width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%); border-radius: 50%;
}
.cta-banner h2 { font-size: 32px; font-weight: 800; margin-bottom: 16px; }
.cta-banner p { font-size: 17px; opacity: 0.9; margin-bottom: 28px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* --- 页脚 --- */
.footer { background: #0F0F1A; color: rgba(255, 255, 255, 0.6); padding: 64px 0 32px; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand-icon {
  width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary-color), var(--accent-purple));
  border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.footer-brand-text { font-size: 20px; font-weight: 800; color: white; }
.footer p { font-size: 14px; line-height: 1.8; }
.footer h4 { color: white; font-size: 14px; font-weight: 700; margin-bottom: 20px; text-transform: uppercase; letter-spacing: 1px; }
.footer a { color: rgba(255, 255, 255, 0.5); font-size: 14px; display: block; margin-bottom: 10px; transition: all 0.3s; }
.footer a:hover { color: white; transform: translateX(4px); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08); margin-top: 48px; padding-top: 24px;
  display: flex; justify-content: space-between; align-items: center; font-size: 13px;
}

/* --- 动画 --- */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideInRight { from { opacity: 0; transform: translateX(24px); } to { opacity: 1; transform: translateX(0); } }
.animate-fadeInUp { animation: fadeInUp 0.6s ease-out forwards; opacity: 0; }
.animate-fadeIn { animation: fadeIn 0.5s ease-out forwards; opacity: 0; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* --- 工具类 --- */
.text-center { text-align: center; }
.text-primary { color: var(--primary-color); }
.text-secondary { color: var(--text-secondary); }
.text-light { color: var(--text-light); }

/* --- 滚动条美化 --- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.15); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 0, 0, 0.25); }

/* --- 响应式 --- */
@media (max-width: 1024px) {
  .building-detail-layout { grid-template-columns: 1fr; }
  .building-sidebar { flex-direction: row; flex-wrap: wrap; }
  .sidebar-card { flex: 1; min-width: 280px; }
  .hero-visual { display: none; }
  .hero h1 { font-size: 42px; }
  .featured-grid { grid-template-columns: 1fr; }
  .featured-card.large { grid-row: span 1; min-height: 320px; }
  .explore-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .navbar-nav {
    display: none; position: fixed; top: var(--header-height); left: 0; right: 0;
    background: white; flex-direction: column; padding: 16px;
    box-shadow: var(--shadow-lg); border-top: 1px solid var(--border-color);
  }
  .navbar-nav.show { display: flex; }
  .navbar-nav a { padding: 12px 16px; border-radius: var(--radius-md); }
  .navbar-toggle { display: block; }
  .hero { min-height: 500px; padding: 100px 0 60px; }
  .hero h1 { font-size: 32px; }
  .hero-stats { gap: 24px; }
  .hero-stat-value { font-size: 24px; }
  .building-grid { grid-template-columns: 1fr; }
  .building-hero { height: 320px; }
  .building-hero h1 { font-size: 28px; }
  .building-main { padding: 24px; border-radius: var(--radius-lg); }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .section { padding: 48px 0; }
  .section-title { font-size: 24px; }
  .explore-grid { grid-template-columns: 1fr; }
  .cta-banner { padding: 40px 24px; }
  .cta-banner h2 { font-size: 24px; }
}
@media (max-width: 480px) {
  .hero-buttons { flex-direction: column; }
  .hero-stats { flex-direction: column; gap: 16px; }
}