/* ===================================================
   高清视频 - 主样式文件
   官网: cix5kw.cn
   =================================================== */

/* --- CSS变量 --- */
:root {
  --primary: #7C3AED;
  --primary-dark: #5B21B6;
  --primary-light: #A78BFA;
  --accent: #EC4899;
  --accent-dark: #BE185D;
  --accent-light: #F9A8D4;
  --cyan: #06B6D4;
  --cyan-dark: #0891B2;
  --bg-dark: #0D0D1A;
  --bg-card: #13132A;
  --bg-card2: #1A1A35;
  --text-primary: #F1F0FF;
  --text-secondary: #A9A8C8;
  --text-muted: #6B6A8A;
  --border: rgba(124,58,237,0.25);
  --border-light: rgba(124,58,237,0.12);
  --shadow: 0 8px 32px rgba(124,58,237,0.18);
  --shadow-card: 0 4px 20px rgba(0,0,0,0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --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', '微软雅黑', 'Noto Sans SC', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* --- 滚动条 --- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===================================================
   顶部导航
   =================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13,13,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
}
.site-logo .logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.main-nav {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover, .main-nav a.active {
  color: var(--text-primary);
  background: rgba(124,58,237,0.2);
}
.header-search {
  display: flex;
  align-items: center;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 6px 14px;
  gap: 8px;
  min-width: 180px;
}
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.875rem;
  width: 100%;
}
.header-search input::placeholder { color: var(--text-muted); }
.header-search button {
  color: var(--text-muted);
  transition: color var(--transition);
  font-size: 0.9rem;
}
.header-search button:hover { color: var(--accent); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===================================================
   英雄Banner
   =================================================== */
.hero-banner {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(13,13,26,0.92) 0%,
    rgba(91,33,182,0.55) 50%,
    rgba(13,13,26,0.75) 100%
  );
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 20px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(124,58,237,0.25);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 5px 14px;
  font-size: 0.8rem;
  color: var(--accent-light);
  margin-bottom: 20px;
  backdrop-filter: blur(4px);
}
.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
.hero-title .brand {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 50%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(124,58,237,0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124,58,237,0.6);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1.5px solid var(--border);
  color: var(--text-primary);
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  backdrop-filter: blur(4px);
}
.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(124,58,237,0.15);
  color: var(--text-primary);
  transform: translateY(-2px);
}

/* ===================================================
   通用区块
   =================================================== */
.section {
  padding: 72px 0;
}
.section-alt {
  background: var(--bg-card);
}
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(124,58,237,0.15);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--primary-light);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}
.section-title span {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
  font-size: 0.95rem;
}

/* ===================================================
   视频卡片网格
   =================================================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.video-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow);
}
.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 0.5s ease;
}
.video-card:hover .video-thumb img {
  transform: scale(1.06);
}
.play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(13,13,26,0.45);
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .play-overlay {
  opacity: 1;
}
.play-btn {
  width: 56px;
  height: 56px;
  background: rgba(124,58,237,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(124,58,237,0.5);
  transition: transform var(--transition);
}
.play-btn:hover { transform: scale(1.1); }
.play-btn svg { width: 22px; height: 22px; fill: #fff; margin-left: 3px; }
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 0.75rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  font-size: 0.7rem;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 700;
}
.video-info {
  padding: 14px 16px;
}
.video-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-muted);
}
.video-meta span {
  display: flex;
  align-items: center;
  gap: 3px;
}
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border-light);
}
.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.author-name {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ===================================================
   特色模块卡片
   =================================================== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0);
  transition: transform var(--transition);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow);
}
.feature-icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, rgba(124,58,237,0.2), rgba(236,72,153,0.2));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.feature-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===================================================
   专家展示
   =================================================== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}
.expert-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(236,72,153,0.2);
}
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  border: 3px solid var(--border);
}
.expert-name {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.expert-role {
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 10px;
  font-weight: 500;
}
.expert-desc {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.5;
}
.expert-btns {
  display: flex;
  gap: 8px;
  justify-content: center;
}
.btn-sm {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  transition: all var(--transition);
}
.btn-sm-primary {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
}
.btn-sm-primary:hover { opacity: 0.9; color: #fff; }
.btn-sm-outline {
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.btn-sm-outline:hover {
  border-color: var(--primary);
  color: var(--primary-light);
}

/* ===================================================
   FAQ
   =================================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open { border-color: var(--primary); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  gap: 12px;
  transition: color var(--transition);
}
.faq-question:hover { color: var(--primary-light); }
.faq-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(124,58,237,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition), background var(--transition);
  font-size: 0.85rem;
  color: var(--primary-light);
}
.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #fff;
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding var(--transition);
  padding: 0 22px;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 22px 18px;
}
.faq-answer p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================
   用户评论
   =================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 22px 20px;
  transition: all var(--transition);
}
.review-card:hover {
  transform: translateY(-3px);
  border-color: var(--border);
  box-shadow: var(--shadow-card);
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user-info .name {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 2px;
}
.review-user-info .date {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.review-stars {
  display: flex;
  gap: 2px;
  margin-bottom: 10px;
  color: #F59E0B;
  font-size: 0.85rem;
}
.review-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.review-tags {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.review-tag {
  padding: 3px 10px;
  background: rgba(124,58,237,0.12);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  font-size: 0.72rem;
  color: var(--primary-light);
}

/* ===================================================
   合作品牌Logo墙
   =================================================== */
.partner-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
}
.partner-logo {
  background: var(--bg-card2);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
  transition: all var(--transition);
  cursor: default;
}
.partner-logo:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(124,58,237,0.1);
}

/* ===================================================
   联系我们
   =================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-info-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-light);
}
.contact-item {
  display: flex;
  gap: 14px;
  margin-bottom: 16px;
  align-items: flex-start;
}
.contact-icon {
  width: 38px;
  height: 38px;
  background: rgba(124,58,237,0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.contact-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.contact-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}
.qr-codes {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.qr-item {
  text-align: center;
}
.qr-box {
  width: 100px;
  height: 100px;
  background: #fff;
  border-radius: 10px;
  margin: 0 auto 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.qr-box svg { width: 80px; height: 80px; }
.qr-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ===================================================
   社交分享
   =================================================== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.share-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  transition: all var(--transition);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  cursor: pointer;
}
.share-btn:hover { transform: translateY(-2px); color: #fff; }
.share-wechat:hover { background: #07C160; border-color: #07C160; }
.share-weibo:hover { background: #E6162D; border-color: #E6162D; }
.share-douyin:hover { background: #010101; border-color: #555; }
.share-bilibili:hover { background: #00A1D6; border-color: #00A1D6; }

/* ===================================================
   页脚
   =================================================== */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 56px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.footer-brand .logo-wrap img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}
.footer-brand .logo-wrap span {
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 18px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.footer-social a {
  width: 36px;
  height: 36px;
  background: var(--bg-card2);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: all var(--transition);
}
.footer-social a:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(124,58,237,0.15);
}
.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.footer-col ul li {
  margin-bottom: 10px;
}
.footer-col ul li a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: var(--primary-light); }
.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-links {
  display: flex;
  gap: 16px;
}
.footer-links a {
  font-size: 0.82rem;
  color: var(--text-muted);
}
.footer-links a:hover { color: var(--primary-light); }

/* ===================================================
   面包屑
   =================================================== */
.breadcrumb {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 32px;
}
.breadcrumb ol {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--text-muted);
}
.breadcrumb li a { color: var(--text-muted); }
.breadcrumb li a:hover { color: var(--primary-light); }
.breadcrumb li.active { color: var(--text-secondary); }
.breadcrumb li:not(:last-child)::after {
  content: '/';
  color: var(--text-muted);
  opacity: 0.5;
}

/* ===================================================
   页面标题区
   =================================================== */
.page-hero {
  padding: 60px 0 40px;
  background: linear-gradient(135deg, rgba(91,33,182,0.15) 0%, rgba(13,13,26,0) 100%);
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 0;
}
.page-hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 900;
  margin-bottom: 10px;
}
.page-hero h1 span {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-hero p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 560px;
}

/* ===================================================
   搜索框（独立）
   =================================================== */
.search-section {
  background: var(--bg-card2);
  border-bottom: 1px solid var(--border-light);
  padding: 14px 0;
}
.search-bar-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 18px;
  gap: 10px;
  max-width: 640px;
  margin: 0 auto;
  transition: border-color var(--transition);
}
.search-bar-wrap:focus-within { border-color: var(--primary); }
.search-bar-wrap input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 0.95rem;
}
.search-bar-wrap input::placeholder { color: var(--text-muted); }
.search-bar-wrap button {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border-radius: 8px;
  padding: 7px 18px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: opacity var(--transition);
}
.search-bar-wrap button:hover { opacity: 0.9; }

/* ===================================================
   标签过滤
   =================================================== */
.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.filter-tab {
  padding: 7px 18px;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border-light);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition);
}
.filter-tab:hover, .filter-tab.active {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-color: transparent;
  color: #fff;
}

/* ===================================================
   统计数字
   =================================================== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-light);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 48px 0;
}
.stat-item {
  background: var(--bg-card);
  padding: 28px 20px;
  text-align: center;
}
.stat-num {
  font-size: 2rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: 4px;
}
.stat-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ===================================================
   加入社区引导
   =================================================== */
.join-cta {
  background: linear-gradient(135deg, rgba(91,33,182,0.3) 0%, rgba(190,24,93,0.2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
}
.join-cta h2 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.join-cta p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  font-size: 0.95rem;
}
.join-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 32px 0;
  text-align: left;
}
.join-step {
  background: rgba(13,13,26,0.5);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
}
.step-num {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 10px;
}
.join-step h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.join-step p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0;
}

/* ===================================================
   响应式
   =================================================== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .join-steps { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(13,13,26,0.98);
    padding: 16px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
    gap: 4px;
  }
  .main-nav.open a { padding: 12px 16px; }
  .nav-toggle { display: flex; }
  .header-search { display: none; }
  .hero-banner { min-height: 420px; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
  .section { padding: 48px 0; }
  .join-cta { padding: 32px 20px; }
}
@media (max-width: 480px) {
  .hero-btns { flex-direction: column; }
  .hero-btns .btn-primary, .hero-btns .btn-outline { width: 100%; justify-content: center; }
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
  .video-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }
}

/* ===================================================
   动画
   =================================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up {
  animation: fadeInUp 0.6s ease forwards;
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* ===================================================
   视频播放模态框
   =================================================== */
.video-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0,0,0,0.85);
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
}
.video-modal.open { display: flex; }
.video-modal-inner {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 800px;
  width: 90%;
  position: relative;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition);
  line-height: 1;
}
.modal-close:hover { color: var(--accent); }
.video-placeholder {
  aspect-ratio: 16/9;
  background: var(--bg-dark);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.video-placeholder .big-play {
  width: 72px;
  height: 72px;
  background: rgba(124,58,237,0.3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}