/* ================================================
   国产自拍 - 主样式文件
   域名: shwtakj.cn
   版本: 2025
   ================================================ */

/* CSS变量 */
:root {
  --primary: #c0392b;
  --primary-dark: #96281b;
  --primary-light: #e74c3c;
  --secondary: #2c3e50;
  --accent: #f39c12;
  --accent2: #8e44ad;
  --bg-dark: #1a1a2e;
  --bg-mid: #16213e;
  --bg-card: #0f3460;
  --text-light: #ecf0f1;
  --text-muted: #95a5a6;
  --border: rgba(255,255,255,0.1);
  --gradient-main: linear-gradient(135deg, #c0392b 0%, #8e44ad 50%, #2980b9 100%);
  --gradient-card: linear-gradient(145deg, #1a1a2e, #16213e);
  --shadow: 0 8px 32px rgba(0,0,0,0.3);
  --radius: 12px;
  --transition: all 0.3s ease;
}

/* 重置样式 */
*, *::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', 'Hiragino Sans GB', sans-serif;
  background: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

/* ================================================
   顶部公告栏
   ================================================ */
.top-bar {
  background: var(--primary-dark);
  color: var(--text-light);
  font-size: 13px;
  padding: 6px 0;
  text-align: center;
}

.top-bar a {
  color: #ffd700;
  margin: 0 12px;
}

/* ================================================
   导航栏
   ================================================ */
.navbar {
  background: rgba(26, 26, 46, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--primary);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.navbar-brand img.nav-logo {
  height: 36px;
  width: auto;
  border-radius: 6px;
}

.brand-text {
  font-size: 22px;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-menu a {
  color: var(--text-light);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
  background: var(--primary);
  color: white;
}

.nav-menu a.hot::after {
  content: 'HOT';
  font-size: 9px;
  background: var(--accent);
  color: #000;
  padding: 1px 4px;
  border-radius: 3px;
  margin-left: 4px;
  vertical-align: super;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
  padding: 8px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-light);
  border-radius: 2px;
  transition: var(--transition);
}

/* ================================================
   搜索框
   ================================================ */
.search-bar-wrapper {
  background: var(--bg-mid);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-form {
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 700px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 30px;
  overflow: hidden;
  transition: var(--transition);
}

.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(192,57,43,0.2);
}

.search-form input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-light);
  padding: 10px 20px;
  font-size: 14px;
}

.search-form input::placeholder {
  color: var(--text-muted);
}

.search-form button {
  background: var(--primary);
  border: none;
  color: white;
  padding: 10px 24px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}

.search-form button:hover {
  background: var(--primary-dark);
}

.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.search-tag {
  font-size: 12px;
  color: var(--text-muted);
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
}

.search-tag:hover {
  border-color: var(--primary);
  color: var(--primary-light);
}

/* ================================================
   面包屑
   ================================================ */
.breadcrumb {
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

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

.breadcrumb a:hover {
  color: var(--primary-light);
}

.breadcrumb span {
  margin: 0 6px;
}

/* ================================================
   Hero Banner
   ================================================ */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner_hero.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.4);
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(192,57,43,0.6) 0%, rgba(26,26,46,0.8) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  width: 100%;
}

.hero-badge {
  display: inline-block;
  background: var(--primary);
  color: white;
  font-size: 12px;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin-bottom: 32px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(192,57,43,0.4);
  color: white;
}

.btn-outline {
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,0.6);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: white;
  color: white;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  flex-wrap: wrap;
}

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

.hero-stat strong {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}

.hero-stat span {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
}

/* ================================================
   通用容器
   ================================================ */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 60px 0;
}

.section-alt {
  background: var(--bg-mid);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-block;
  background: rgba(192,57,43,0.15);
  color: var(--primary-light);
  border: 1px solid rgba(192,57,43,0.3);
  font-size: 12px;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
  letter-spacing: 1px;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-title span {
  color: var(--primary-light);
}

.section-desc {
  color: var(--text-muted);
  font-size: 15px;
  max-width: 600px;
  margin: 0 auto;
}

/* ================================================
   视频卡片
   ================================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

.video-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.video-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.4);
  border-color: var(--primary);
}

.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #0f3460;
}

.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.3);
  opacity: 0;
  transition: var(--transition);
}

.video-card:hover .play-btn {
  opacity: 1;
}

.play-icon {
  width: 60px;
  height: 60px;
  background: rgba(192,57,43,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.play-icon svg {
  width: 24px;
  height: 24px;
  fill: white;
  margin-left: 4px;
}

.video-card:hover .play-icon {
  transform: scale(1.1);
  background: var(--primary);
}

.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: white;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
}

.video-quality {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: white;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.video-info {
  padding: 16px;
}

.video-title {
  font-size: 15px;
  font-weight: 600;
  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;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-muted);
}

.video-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
}

.video-stat-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.video-category {
  display: inline-block;
  background: rgba(192,57,43,0.15);
  color: var(--primary-light);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
}

/* ================================================
   功能模块卡片
   ================================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: rgba(192,57,43,0.15);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 28px;
  transition: var(--transition);
}

.feature-card:hover .feature-icon {
  background: var(--primary);
}

.feature-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================================================
   专家展示
   ================================================ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

.expert-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.expert-photo {
  aspect-ratio: 3/4;
  overflow: hidden;
  max-height: 280px;
}

.expert-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

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

.expert-info {
  padding: 20px;
}

.expert-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.expert-title {
  font-size: 13px;
  color: var(--primary-light);
  margin-bottom: 12px;
}

.expert-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.expert-tag {
  font-size: 11px;
  background: rgba(255,255,255,0.08);
  padding: 3px 10px;
  border-radius: 20px;
  color: var(--text-muted);
}

.expert-btns {
  display: flex;
  gap: 8px;
}

.btn-sm {
  padding: 7px 16px;
  font-size: 13px;
  border-radius: 6px;
}

/* ================================================
   合作品牌
   ================================================ */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}

.partner-item {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
}

.partner-item:hover {
  background: rgba(192,57,43,0.1);
  border-color: var(--primary);
  color: var(--text-light);
}

/* ================================================
   用户评论
   ================================================ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}

.review-card:hover {
  border-color: rgba(192,57,43,0.4);
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  flex-shrink: 0;
}

.review-user strong {
  display: block;
  font-size: 15px;
}

.review-user span {
  font-size: 12px;
  color: var(--text-muted);
}

.review-stars {
  color: var(--accent);
  font-size: 14px;
  margin-bottom: 10px;
}

.review-text {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  line-height: 1.7;
}

/* ================================================
   FAQ
   ================================================ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question:hover {
  background: rgba(192,57,43,0.1);
}

.faq-arrow {
  font-size: 18px;
  transition: transform 0.3s ease;
  color: var(--primary-light);
}

.faq-item.open .faq-arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 24px 20px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ================================================
   联系我们
   ================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-info h3 {
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
  padding: 16px;
  background: rgba(255,255,255,0.04);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.contact-icon {
  font-size: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-item strong {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
}

.contact-item span {
  font-size: 13px;
  color: var(--text-muted);
}

.qr-section {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.qr-item {
  text-align: center;
}

.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: 8px;
  border: 3px solid var(--border);
  margin-bottom: 8px;
}

.qr-item p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ================================================
   社交分享
   ================================================ */
.share-bar {
  background: var(--bg-mid);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

.share-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.share-label {
  font-size: 14px;
  color: var(--text-muted);
  white-space: nowrap;
}

.share-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

.share-wechat { background: #07c160; color: white; }
.share-weibo { background: #e6162d; color: white; }
.share-douyin { background: #010101; color: white; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; color: white; }

.share-btn:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

/* ================================================
   页脚
   ================================================ */
.footer {
  background: #0d0d1a;
  border-top: 2px solid var(--primary);
  padding: 50px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px 40px;
}

.footer-brand img {
  height: 48px;
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-light);
  position: relative;
  padding-bottom: 10px;
}

.footer-col h4::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
}

.footer-col ul li {
  margin-bottom: 8px;
}

.footer-col ul li a {
  font-size: 13px;
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--primary-light);
  padding-left: 4px;
}

.footer-bottom {
  background: rgba(0,0,0,0.3);
  border-top: 1px solid var(--border);
  padding: 16px 20px;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

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

.footer-bottom a:hover {
  color: var(--primary-light);
}

.footer-qr {
  display: flex;
  gap: 16px;
  margin-top: 16px;
}

.footer-qr-item {
  text-align: center;
}

.footer-qr-item img {
  width: 80px;
  height: 80px;
  border-radius: 6px;
  border: 2px solid var(--border);
}

.footer-qr-item p {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ================================================
   How-To 加入社区
   ================================================ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  counter-reset: step;
}

.howto-step {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  position: relative;
  counter-increment: step;
  transition: var(--transition);
}

.howto-step:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.howto-step::before {
  content: counter(step);
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  background: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: white;
}

.howto-step .step-icon {
  font-size: 36px;
  margin-bottom: 12px;
  margin-top: 8px;
}

.howto-step h3 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.howto-step p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ================================================
   AI 赋能模块
   ================================================ */
.ai-section {
  background: linear-gradient(135deg, #0f3460 0%, #1a1a2e 100%);
  border: 1px solid rgba(142, 68, 173, 0.3);
  border-radius: var(--radius);
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.ai-features {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ai-feature {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px;
  background: rgba(255,255,255,0.04);
  border-radius: 8px;
  border: 1px solid rgba(142,68,173,0.2);
  transition: var(--transition);
}

.ai-feature:hover {
  border-color: rgba(142,68,173,0.5);
  background: rgba(142,68,173,0.1);
}

.ai-feature-icon {
  font-size: 24px;
  flex-shrink: 0;
}

.ai-feature h4 {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.ai-feature p {
  font-size: 13px;
  color: var(--text-muted);
}

/* ================================================
   直播社区
   ================================================ */
.live-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
}

.live-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: var(--transition);
}

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

.live-thumb {
  position: relative;
  aspect-ratio: 3/4;
  overflow: hidden;
  background: #0f3460;
}

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

.live-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: white;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  font-weight: 600;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.live-viewers {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.7);
  color: white;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 4px;
}

.live-info {
  padding: 14px;
}

.live-name {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.live-topic {
  font-size: 12px;
  color: var(--text-muted);
}

/* ================================================
   统计数据
   ================================================ */
.stats-bar {
  background: var(--gradient-main);
  padding: 40px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

.stat-item {
  text-align: center;
  color: white;
}

.stat-item strong {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-item span {
  font-size: 14px;
  opacity: 0.85;
}

/* ================================================
   标签云
   ================================================ */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-item {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.tag-item:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ================================================
   内页布局
   ================================================ */
.page-header {
  background: linear-gradient(135deg, var(--bg-mid) 0%, var(--bg-dark) 100%);
  border-bottom: 2px solid var(--primary);
  padding: 40px 0;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-header p {
  color: var(--text-muted);
  font-size: 15px;
}

.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  padding: 16px;
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.filter-btn {
  padding: 7px 18px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ================================================
   分页
   ================================================ */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}

.page-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--gradient-card);
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.page-btn:hover,
.page-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* ================================================
   响应式
   ================================================ */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .ai-section {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(26,26,46,0.98);
    flex-direction: column;
    padding: 16px;
    border-bottom: 2px solid var(--primary);
    gap: 4px;
  }
  
  .nav-menu.open {
    display: flex;
  }
  
  .nav-menu a {
    width: 100%;
    padding: 12px 16px;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hero {
    min-height: 400px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero-stats {
    gap: 20px;
  }
  
  .hero-stat strong {
    font-size: 1.5rem;
  }
  
  .video-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .search-tags {
    display: none;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .expert-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

@media (max-width: 480px) {
  .video-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-btns {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ================================================
   动画
   ================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease forwards;
}

/* 懒加载占位 */
img[loading="lazy"] {
  background: var(--bg-mid);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 3px;
}

/* ================================================
   视频播放器模态框
   ================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background: var(--bg-mid);
  border-radius: var(--radius);
  padding: 20px;
  max-width: 800px;
  width: 90%;
  position: relative;
}

.modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  background: none;
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
}

.modal-video {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 15px;
}

/* 通知条 */
.notice-bar {
  background: rgba(192,57,43,0.15);
  border: 1px solid rgba(192,57,43,0.3);
  border-radius: 8px;
  padding: 12px 20px;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--primary-light);
  display: flex;
  align-items: center;
  gap: 10px;
}