/* =============================================
   三级传媒 - 主样式文件
   Brand: 三级 | Domain: 886019.cn
   ============================================= */

/* CSS变量 - 原创配色方案 */
:root {
  --primary: #C0392B;
  --primary-dark: #96281B;
  --primary-light: #E74C3C;
  --gold: #D4AF37;
  --gold-light: #F0D060;
  --dark: #1A1A2E;
  --dark-2: #16213E;
  --dark-3: #0F3460;
  --text: #2C3E50;
  --text-light: #7F8C8D;
  --bg: #FAFAFA;
  --bg-card: #FFFFFF;
  --border: #E8E8E8;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 32px rgba(192,57,43,0.18);
  --radius: 12px;
  --radius-sm: 6px;
  --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
}

/* 重置与基础 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, 'PingFang SC', 'Microsoft YaHei', '微软雅黑', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

/* =============================================
   顶部公告栏
   ============================================= */
.top-bar {
  background: linear-gradient(90deg, var(--dark) 0%, var(--dark-3) 100%);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  padding: 6px 0;
  text-align: center;
}
.top-bar a { color: var(--gold); }
.top-bar .marquee-text { display: inline-block; }

/* =============================================
   导航栏
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--primary);
  box-shadow: 0 2px 16px rgba(192,57,43,0.10);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 8px;
}
.site-logo .logo-text {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 2px;
  line-height: 1;
}
.site-logo .logo-sub {
  font-size: 11px;
  color: var(--text-light);
  letter-spacing: 1px;
}
.main-nav {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  position: relative;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 50%;
  width: 0; height: 2px;
  background: var(--primary);
  transform: translateX(-50%);
  transition: width 0.3s;
}
.main-nav a:hover { color: var(--primary); }
.main-nav a:hover::after { width: 70%; }
.main-nav a.active { color: var(--primary); background: rgba(192,57,43,0.06); }
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.btn-join {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: 0 3px 12px rgba(192,57,43,0.3);
  transition: var(--transition);
}
.btn-join:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(192,57,43,0.4);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* =============================================
   搜索框
   ============================================= */
.search-bar-wrap {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-form {
  flex: 1;
  max-width: 640px;
  display: flex;
  align-items: center;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 24px;
  overflow: hidden;
  transition: var(--transition);
}
.search-form:focus-within {
  background: rgba(255,255,255,0.15);
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(212,175,55,0.15);
}
.search-form input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  padding: 10px 18px;
  color: #fff;
  font-size: 14px;
}
.search-form input::placeholder { color: rgba(255,255,255,0.45); }
.search-form button {
  background: var(--primary);
  border: none;
  color: #fff;
  padding: 10px 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
}
.search-form button:hover { background: var(--primary-dark); }
.search-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.search-tags span {
  font-size: 12px;
  color: rgba(255,255,255,0.55);
}
.search-tags a {
  font-size: 12px;
  color: rgba(255,255,255,0.7);
  padding: 2px 10px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  transition: var(--transition);
}
.search-tags a:hover { color: var(--gold); border-color: var(--gold); }

/* =============================================
   面包屑
   ============================================= */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 10px 20px;
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 6px;
}
.breadcrumb a { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }

/* =============================================
   Hero 区域
   ============================================= */
.hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--dark);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero-banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  transform: scale(1.02);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1.05); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,26,46,0.85) 0%, rgba(192,57,43,0.3) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 60px 20px;
  width: 100%;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(212,175,55,0.2);
  border: 1px solid var(--gold);
  color: var(--gold);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero h1 .highlight { color: var(--gold); }
.hero p {
  font-size: 17px;
  color: rgba(255,255,255,0.82);
  max-width: 560px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 13px 28px;
  border-radius: 28px;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 4px 20px rgba(192,57,43,0.4);
  transition: var(--transition);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(192,57,43,0.5);
  color: #fff;
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.1);
  color: #fff;
  border: 2px solid rgba(255,255,255,0.4);
  padding: 13px 28px;
  border-radius: 28px;
  font-size: 15px;
  font-weight: 600;
  backdrop-filter: blur(8px);
  transition: var(--transition);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.2);
  border-color: #fff;
  color: #fff;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-item .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--gold);
  line-height: 1;
}
.stat-item .label {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
  margin-top: 4px;
}

/* =============================================
   通用区块
   ============================================= */
.section {
  padding: 64px 0;
}
.section-alt { background: #F5F5F7; }
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  background: rgba(192,57,43,0.08);
  color: var(--primary);
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
  border: 1px solid rgba(192,57,43,0.15);
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title .brand { color: var(--primary); }
.section-desc {
  font-size: 16px;
  color: var(--text-light);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* =============================================
   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-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark);
}
.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); }
.play-btn {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0);
  transition: var(--transition);
  opacity: 0;
}
.video-card:hover .play-btn { opacity: 1; background: rgba(0,0,0,0.35); }
.play-icon {
  width: 56px; height: 56px;
  background: rgba(255,255,255,0.95);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon::after {
  content: '';
  border-left: 20px solid var(--primary);
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.75);
  color: #fff;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px; left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info {
  padding: 14px 16px 16px;
}
.video-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark);
  line-height: 1.5;
  margin-bottom: 8px;
  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-light);
}
.video-meta .author {
  display: flex;
  align-items: center;
  gap: 6px;
}
.video-meta .author img {
  width: 24px; height: 24px;
  border-radius: 50%;
  object-fit: cover;
}
.video-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-light);
  margin-top: 8px;
}
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* =============================================
   图片卡片
   ============================================= */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}
.photo-card {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  aspect-ratio: 3/4;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.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;
  bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  padding: 24px 14px 14px;
  transform: translateY(100%);
  transition: var(--transition);
}
.photo-card:hover .photo-overlay { transform: translateY(0); }
.photo-overlay p { color: #fff; font-size: 13px; font-weight: 500; }

/* =============================================
   专家卡片
   ============================================= */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}
.expert-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}
.expert-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(192,57,43,0.2);
}
.expert-avatar {
  width: 88px; height: 88px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--primary);
  box-shadow: 0 4px 16px rgba(192,57,43,0.2);
}
.expert-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 4px;
}
.expert-role {
  font-size: 13px;
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 12px;
}
.expert-desc {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}
.expert-awards {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 16px;
}
.award-tag {
  background: rgba(212,175,55,0.1);
  color: #B8860B;
  border: 1px solid rgba(212,175,55,0.3);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
}
.expert-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}
.btn-sm {
  padding: 7px 16px;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm-primary {
  background: var(--primary);
  color: #fff;
}
.btn-sm-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-sm-outline {
  border: 1px solid var(--primary);
  color: var(--primary);
}
.btn-sm-outline:hover { background: var(--primary); color: #fff; }

/* =============================================
   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(--bg-card);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
  cursor: pointer;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary);
}
.feature-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, rgba(192,57,43,0.1), rgba(212,175,55,0.1));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  font-size: 26px;
  transition: var(--transition);
}
.feature-card:hover .feature-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}
.feature-card:hover .feature-icon span { filter: brightness(10); }
.feature-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}
.feature-desc {
  font-size: 12px;
  color: var(--text-light);
  line-height: 1.6;
}

/* =============================================
   合作品牌Logo墙
   ============================================= */
.partner-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 28px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-light);
  transition: var(--transition);
  cursor: pointer;
}
.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow);
}

/* =============================================
   FAQ
   ============================================= */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: var(--primary); }
.faq-question {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--dark);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-arrow {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: rgba(192,57,43,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.3s;
  color: var(--primary);
  font-size: 14px;
}
.faq-item.open .faq-arrow { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}
.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--text-light);
  line-height: 1.8;
}

/* =============================================
   用户评价
   ============================================= */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}
.review-card::before {
  content: '\201C';
  position: absolute;
  top: 12px; right: 20px;
  font-size: 60px;
  color: rgba(192,57,43,0.08);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 12px;
}
.star { color: var(--gold); font-size: 15px; }
.review-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.8;
  margin-bottom: 16px;
}
.reviewer {
  display: flex;
  align-items: center;
  gap: 10px;
}
.reviewer-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--gold));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}
.reviewer-name { font-size: 14px; font-weight: 600; color: var(--dark); }
.reviewer-date { font-size: 12px; color: var(--text-light); }

/* =============================================
   加入社区 How-To
   ============================================= */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  position: relative;
  transition: var(--transition);
}
.howto-step:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.step-num {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 14px;
}
.step-title { font-size: 16px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.step-desc { font-size: 13px; color: var(--text-light); line-height: 1.7; }

/* =============================================
   联系我们
   ============================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.contact-info-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary);
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.contact-item:last-child { border-bottom: none; }
.contact-icon {
  width: 36px; height: 36px;
  background: rgba(192,57,43,0.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--text-light); margin-bottom: 2px; }
.contact-value { font-size: 14px; font-weight: 600; color: var(--dark); }
.qr-group {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}
.qr-item { text-align: center; }
.qr-item img {
  width: 130px; height: 130px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
  margin-bottom: 8px;
}
.qr-label { font-size: 13px; color: var(--text-light); font-weight: 500; }

/* =============================================
   社交分享
   ============================================= */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--text-light); font-weight: 500; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.share-wechat { background: #07C160; color: #fff; }
.share-weibo { background: #E6162D; color: #fff; }
.share-douyin { background: #010101; color: #fff; }
.share-bilibili { background: #00A1D6; color: #fff; }
.share-btn:hover { opacity: 0.85; transform: translateY(-2px); color: #fff; }

/* =============================================
   页脚
   ============================================= */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .site-logo { margin-bottom: 16px; }
.footer-brand .site-logo .logo-text { color: #fff; }
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
  margin-bottom: 20px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--gold); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 13px; color: rgba(255,255,255,0.45); }
.footer-bottom a { color: var(--gold); }
.footer-logo-bottom {
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-logo-bottom img { width: 32px; height: 32px; border-radius: 6px; }
.footer-logo-bottom span { color: #fff; font-weight: 700; font-size: 16px; }

/* =============================================
   内页通用
   ============================================= */
.page-hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-3) 100%);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('../images/studio-bg.jpg') center/cover;
  opacity: 0.12;
}
.page-hero-content {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
}
.page-hero p {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  max-width: 600px;
  line-height: 1.8;
}
.page-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 48px 20px;
}

/* =============================================
   标签
   ============================================= */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}
.tag-red { background: rgba(192,57,43,0.1); color: var(--primary); }
.tag-gold { background: rgba(212,175,55,0.1); color: #B8860B; }
.tag-blue { background: rgba(52,152,219,0.1); color: #2980B9; }
.tag-green { background: rgba(39,174,96,0.1); color: #1E8449; }

/* =============================================
   加载动画
   ============================================= */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* =============================================
   响应式
   ============================================= */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: #fff;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    z-index: 999;
  }
  .hamburger { display: flex; }
  .hero { min-height: 420px; }
  .hero h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .photo-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .search-bar-inner { flex-direction: column; align-items: stretch; }
  .search-tags { display: none; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .howto-steps { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
}

/* =============================================
   AI赋能模块
   ============================================= */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, var(--dark-2), var(--dark-3));
  border-radius: var(--radius);
  padding: 32px 24px;
  color: #fff;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid rgba(255,255,255,0.08);
}
.ai-card::before {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(212,175,55,0.15), transparent);
  border-radius: 50%;
}
.ai-card:hover { transform: translateY(-6px); border-color: rgba(212,175,55,0.3); }
.ai-icon { font-size: 36px; margin-bottom: 16px; }
.ai-title { font-size: 18px; font-weight: 700; margin-bottom: 10px; color: var(--gold); }
.ai-desc { font-size: 14px; color: rgba(255,255,255,0.7); line-height: 1.8; }
@media (max-width: 768px) { .ai-grid { grid-template-columns: 1fr; } }

/* =============================================
   直播区域
   ============================================= */
.live-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.live-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
}
.live-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
.live-thumb {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
}
.live-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.live-card:hover .live-thumb img { transform: scale(1.06); }
.live-badge {
  position: absolute;
  top: 8px; left: 8px;
  background: #E74C3C;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.live-badge::before {
  content: '';
  width: 6px; height: 6px;
  background: #fff;
  border-radius: 50%;
  animation: blink 1s infinite;
}
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }
.live-viewers {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,0.65);
  color: #fff;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 12px;
}
.live-info { padding: 12px 14px 14px; }
.live-name { font-size: 14px; font-weight: 600; color: var(--dark); margin-bottom: 4px; }
.live-host { font-size: 12px; color: var(--text-light); }

/* =============================================
   滚动到顶部按钮
   ============================================= */
.back-top {
  position: fixed;
  bottom: 32px; right: 24px;
  width: 44px; height: 44px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(192,57,43,0.4);
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  z-index: 999;
  font-size: 18px;
}
.back-top.show { opacity: 1; transform: translateY(0); }
.back-top:hover { background: var(--primary-dark); transform: translateY(-3px); }

/* =============================================
   通知条
   ============================================= */
.notice-strip {
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 10px 0;
  text-align: center;
  font-size: 14px;
}
.notice-strip strong { font-weight: 700; }
.notice-strip a { color: var(--gold); text-decoration: underline; }

/* =============================================
   分页
   ============================================= */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
}
.page-btn {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--border);
  color: var(--text);
  transition: var(--transition);
  cursor: pointer;
}
.page-btn:hover, .page-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}