/* =========================================
   91视频 - 主样式文件
   ykmnr.cn | 原创设计
   ========================================= */

/* ===== CSS变量 ===== */
:root {
  --primary: #0a0e1a;
  --secondary: #00d4ff;
  --accent: #ff6b9d;
  --accent2: #a855f7;
  --bg-dark: #0d1117;
  --bg-card: #161b2e;
  --bg-card2: #1a2035;
  --text-main: #e8eaf6;
  --text-sub: #8892b0;
  --border-color: rgba(0,212,255,0.15);
  --gradient-main: linear-gradient(135deg, #00d4ff 0%, #a855f7 100%);
  --gradient-accent: linear-gradient(135deg, #ff6b9d 0%, #ff8c00 100%);
  --gradient-dark: linear-gradient(135deg, #0a0e1a 0%, #1a2035 100%);
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--secondary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }
h1,h2,h3,h4,h5,h6 { line-height: 1.3; font-weight: 700; }

/* ===== 顶部公告栏 ===== */
.top-bar {
  background: var(--gradient-main);
  color: #fff;
  text-align: center;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.3px;
}
.top-bar a { color: #fff; text-decoration: underline; font-weight: 700; }
.top-bar a:hover { opacity: 0.85; }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 900;
  background: rgba(10,14,26,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.5); }
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 64px;
  gap: 24px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  object-fit: cover;
}
.brand-name {
  font-size: 22px;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
}
.nav-menu li a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-sub);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-menu li a:hover,
.nav-menu li a.active {
  color: var(--secondary);
  background: rgba(0,212,255,0.1);
}
.nav-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.btn-join {
  background: var(--gradient-main);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  transition: transform var(--transition), box-shadow var(--transition);
}
.btn-join:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0,212,255,0.4); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== 搜索栏 ===== */
.search-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 0;
}
.search-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}
.search-form {
  display: flex;
  gap: 0;
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-dark);
  max-width: 680px;
  margin-bottom: 10px;
}
.search-form input {
  flex: 1;
  padding: 10px 20px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 14px;
}
.search-form input::placeholder { color: var(--text-sub); }
.search-form button {
  padding: 10px 24px;
  background: var(--gradient-main);
  border: none;
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
  transition: opacity var(--transition);
}
.search-form button:hover { opacity: 0.9; }
.search-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.search-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 12px;
  font-size: 12px;
  color: var(--text-sub);
  cursor: pointer;
  transition: all var(--transition);
}
.search-tag:hover { background: rgba(0,212,255,0.15); color: var(--secondary); }

/* ===== 面包屑 ===== */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 24px;
  font-size: 13px;
  color: var(--text-sub);
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb a { color: var(--text-sub); }
.breadcrumb a:hover { color: var(--secondary); }

/* ===== Hero Banner ===== */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 80px 24px;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/images/banner_hero.jpg') center/cover no-repeat;
  filter: brightness(0.25) saturate(1.2);
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,212,255,0.15) 0%, rgba(168,85,247,0.1) 50%, rgba(255,107,157,0.1) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(0,212,255,0.15);
  border: 1px solid rgba(0,212,255,0.3);
  border-radius: 20px;
  font-size: 13px;
  color: var(--secondary);
  margin-bottom: 20px;
  font-weight: 600;
}
.hero h1 {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 20px;
  color: #fff;
}
.hero h1 .highlight {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  max-width: 600px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.btn-primary {
  display: inline-block;
  padding: 13px 32px;
  background: var(--gradient-main);
  color: #fff;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 700;
  transition: transform var(--transition), box-shadow var(--transition);
  border: none;
  text-decoration: none;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,212,255,0.4); color: #fff; }
.btn-outline {
  display: inline-block;
  padding: 13px 32px;
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 24px;
  font-size: 15px;
  font-weight: 700;
  transition: all var(--transition);
  text-decoration: none;
}
.btn-outline:hover { border-color: var(--secondary); color: var(--secondary); background: rgba(0,212,255,0.08); }
.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.hero-stat .num {
  font-size: 28px;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-stat .label { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 2px; }

/* ===== 通用布局 ===== */
.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.section { padding: 72px 0; }
.section-alt { background: var(--bg-card); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 3px;
  color: var(--secondary);
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.2);
  padding: 4px 14px;
  border-radius: 12px;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 12px;
}
.section-title .brand {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc { font-size: 15px; color: var(--text-sub); max-width: 640px; margin: 0 auto; }

/* ===== 统计数据 ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
}
.stat-box {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}
.stat-box:hover { transform: translateY(-3px); border-color: rgba(0,212,255,0.35); }
.stat-box .num {
  font-size: 28px;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-box .label { font-size: 13px; color: var(--text-sub); margin-top: 4px; }

/* ===== 视频卡片 ===== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(0,212,255,0.3);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-card2);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.06); }
.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  width: 56px;
  height: 56px;
  background: rgba(0,212,255,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s, transform 0.25s;
  box-shadow: 0 4px 20px rgba(0,212,255,0.5);
  z-index: 2;
}
.video-card:hover .video-play-btn {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}
.play-icon svg {
  width: 24px;
  height: 24px;
  fill: #fff;
  margin-left: 3px;
}
.video-live-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(255,0,0,0.85);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  z-index: 2;
}
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  z-index: 2;
}
.video-info { padding: 16px; }
.video-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  font-size: 12px;
  color: var(--text-sub);
}
.author-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  object-fit: cover;
}
.video-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-sub);
}

/* ===== 功能卡片 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.3);
  box-shadow: var(--shadow-card);
}
.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}
.feature-icon.blue { background: rgba(0,212,255,0.15); }
.feature-icon.pink { background: rgba(255,107,157,0.15); }
.feature-icon.purple { background: rgba(168,85,247,0.15); }
.feature-icon.orange { background: rgba(255,140,0,0.15); }
.feature-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; color: var(--text-main); }
.feature-card p { font-size: 13px; color: var(--text-sub); line-height: 1.7; }

/* ===== 照片网格 ===== */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.photo-card {
  position: relative;
  aspect-ratio: 3/4;
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
}
.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.photo-card:hover img { transform: scale(1.08); }
.photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 60%);
  display: flex;
  align-items: flex-end;
  padding: 12px;
  opacity: 0;
  transition: opacity var(--transition);
}
.photo-card:hover .photo-overlay { opacity: 1; }
.photo-overlay span { color: #fff; font-size: 13px; font-weight: 600; }

/* ===== AI布局 ===== */
@media (max-width: 768px) {
  .ai-layout, .comm-layout { grid-template-columns: 1fr !important; }
}

/* ===== 专家卡片 ===== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}
.expert-card:hover { transform: translateY(-4px); border-color: rgba(0,212,255,0.3); }
.expert-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid transparent;
  background: linear-gradient(var(--bg-card2), var(--bg-card2)) padding-box,
              var(--gradient-main) border-box;
}
.expert-name { font-size: 20px; font-weight: 800; margin-bottom: 6px; }
.expert-title { font-size: 13px; color: var(--secondary); margin-bottom: 14px; font-weight: 600; }
.expert-desc { font-size: 13px; color: var(--text-sub); line-height: 1.7; margin-bottom: 16px; }
.expert-awards { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-bottom: 20px; }
.award-tag {
  padding: 4px 10px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 10px;
  font-size: 11px;
  color: var(--text-sub);
}
.expert-actions { display: flex; gap: 10px; justify-content: center; }
.btn-sm {
  padding: 8px 18px;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
  display: inline-block;
}
.btn-sm.primary { background: var(--gradient-main); color: #fff; }
.btn-sm.primary:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(0,212,255,0.3); }
.btn-sm.outline { background: transparent; color: var(--text-sub); border: 1px solid var(--border-color); }
.btn-sm.outline:hover { border-color: var(--secondary); color: var(--secondary); }

/* ===== 合作伙伴 ===== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}
.partner-card {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px 16px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-sub);
  transition: all var(--transition);
}
.partner-card:hover { border-color: rgba(0,212,255,0.3); color: var(--secondary); transform: translateY(-2px); }

/* ===== 步骤卡片 ===== */
.how-to-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.step-card {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: transform var(--transition);
}
.step-card:hover { transform: translateY(-3px); }
.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gradient-main);
  color: #fff;
  font-size: 20px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}
.step-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 10px; }
.step-card p { font-size: 13px; color: var(--text-sub); line-height: 1.7; }

/* ===== 用户评价 ===== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform var(--transition), border-color var(--transition);
}
.review-card:hover { transform: translateY(-3px); border-color: rgba(0,212,255,0.25); }
.review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.reviewer-avatar { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; }
.reviewer-info .name { font-size: 14px; font-weight: 700; }
.reviewer-info .date { font-size: 12px; color: var(--text-sub); margin-top: 2px; }
.review-stars { color: #ffd700; font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 13px; color: var(--text-sub); line-height: 1.7; margin-bottom: 12px; }
.review-tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: 10px;
  font-size: 11px;
  color: var(--secondary);
}

/* ===== FAQ ===== */
.faq-list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: rgba(0,212,255,0.3); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 20px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  transition: color var(--transition);
  gap: 12px;
}
.faq-question:hover { color: var(--secondary); }
.faq-question .icon {
  font-size: 20px;
  font-weight: 300;
  color: var(--secondary);
  flex-shrink: 0;
  width: 24px;
  text-align: center;
  transition: transform var(--transition);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ===== 联系我们 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.contact-card {
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 28px 24px;
}
.contact-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 20px; color: var(--secondary); }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
}
.contact-item .icon { font-size: 16px; flex-shrink: 0; margin-top: 2px; }
.contact-item .text { font-size: 14px; color: var(--text-sub); }
.contact-item .text a { color: var(--text-sub); }
.contact-item .text a:hover { color: var(--secondary); }

/* ===== 标签云 ===== */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
.tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  font-size: 13px;
  color: var(--text-sub);
  transition: all var(--transition);
  cursor: pointer;
}
.tag:hover { background: rgba(0,212,255,0.1); border-color: rgba(0,212,255,0.3); color: var(--secondary); }

/* ===== 筛选标签 ===== */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}
.filter-tab {
  padding: 8px 18px;
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-sub);
  transition: all var(--transition);
}
.filter-tab:hover { border-color: rgba(0,212,255,0.3); color: var(--secondary); }
.filter-tab.active { background: var(--gradient-main); border-color: transparent; color: #fff; font-weight: 700; }

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}
.page-btn {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--bg-card2);
  border: 1px solid var(--border-color);
  color: var(--text-sub);
  font-size: 14px;
  transition: all var(--transition);
}
.page-btn:hover { border-color: rgba(0,212,255,0.3); color: var(--secondary); }
.page-btn.active { background: var(--gradient-main); border-color: transparent; color: #fff; font-weight: 700; }

/* ===== 公告栏 ===== */
.notice-bar {
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.2);
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-size: 14px;
  color: var(--text-sub);
  margin-bottom: 32px;
}
.notice-bar strong { color: var(--secondary); }

/* ===== 页面Hero ===== */
.page-hero {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card2) 100%);
  border-bottom: 1px solid var(--border-color);
  padding: 60px 24px;
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 900;
  margin-bottom: 16px;
}
.page-hero p {
  font-size: 15px;
  color: var(--text-sub);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ===== 分享区域 ===== */
.share-section {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: 16px 0;
}
.share-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 13px; color: var(--text-sub); }
.share-btn {
  padding: 6px 16px;
  border-radius: 14px;
  font-size: 12px;
  font-weight: 600;
  border: none;
  transition: transform var(--transition), opacity var(--transition);
}
.share-btn:hover { transform: translateY(-1px); opacity: 0.9; }
.share-btn.wechat { background: #07c160; color: #fff; }
.share-btn.weibo { background: #e6162d; color: #fff; }
.share-btn.douyin { background: #000; color: #fff; }
.share-btn.bilibili { background: #00a1d6; color: #fff; }

/* ===== 底部 ===== */
.footer {
  background: var(--primary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0 0;
}
.footer-grid {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
}
.footer-brand .logo-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand .logo-wrap img { width: 44px; height: 44px; border-radius: 10px; object-fit: cover; }
.footer-brand p { font-size: 13px; color: var(--text-sub); line-height: 1.8; margin-bottom: 20px; }
.footer-qrcodes { display: flex; gap: 20px; }
.qr-item { text-align: center; }
.qr-item img { border-radius: 8px; margin-bottom: 6px; }
.qr-item span { font-size: 11px; color: var(--text-sub); }
.footer-col h4 { font-size: 15px; font-weight: 700; margin-bottom: 16px; color: var(--text-main); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 13px; color: var(--text-sub); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--secondary); }
.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding: 20px 24px;
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-sub);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom a { color: var(--text-sub); }
.footer-bottom a:hover { color: var(--secondary); }
.social-links { display: flex; gap: 12px; }
.social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: all var(--transition);
  text-decoration: none;
}
.social-link:hover { border-color: rgba(0,212,255,0.3); transform: translateY(-2px); }

/* ===== 视频模态框 ===== */
.video-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.3s;
}
.video-modal.show { opacity: 1; }
.video-modal-inner {
  position: relative;
  width: 100%;
  max-width: 860px;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--border-color);
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  transition: background var(--transition);
}
.modal-close:hover { background: rgba(255,255,255,0.2); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10,14,26,0.98);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    gap: 4px;
  }
  .nav-menu.open { display: flex; }
  .nav-menu li a { padding: 12px 16px; font-size: 15px; }
  .hero { min-height: 480px; padding: 60px 16px; }
  .hero-stats { gap: 24px; }
  .section { padding: 48px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .how-to-steps { grid-template-columns: 1fr 1fr; }
  .partner-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 28px; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-outline { text-align: center; }
  .video-grid { grid-template-columns: 1fr; }
  .how-to-steps { grid-template-columns: 1fr; }
  .partner-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .search-form button { padding: 10px 14px; font-size: 12px; }
}

/* ===== 打印样式 ===== */
@media print {
  .navbar, .top-bar, .search-bar, .share-section, .footer { display: none; }
  body { background: #fff; color: #000; }
}