/* ============================================
   PG电子 - 主样式表
   argzyx.com | 影视传媒 · 视频社区
   ============================================ */

/* CSS变量 */
:root {
  --primary: #6c3de8;
  --primary-dark: #4a1fa8;
  --primary-light: #9b6ff5;
  --secondary: #00d4ff;
  --accent: #ff6b35;
  --dark: #0a0a1a;
  --dark-2: #12122a;
  --dark-3: #1a1a3a;
  --card-bg: #16162e;
  --text-primary: #f0f0ff;
  --text-secondary: #a0a0c0;
  --text-muted: #6060a0;
  --border: rgba(108, 61, 232, 0.3);
  --gradient-main: linear-gradient(135deg, #6c3de8 0%, #00d4ff 100%);
  --gradient-dark: linear-gradient(180deg, #0a0a1a 0%, #12122a 100%);
  --shadow-glow: 0 0 30px rgba(108, 61, 232, 0.4);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 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', 'Helvetica Neue', Arial, sans-serif;
  background: var(--dark);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--secondary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-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(--dark-2); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ============ 布局容器 ============ */
.container { max-width: 1280px; margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }

/* ============ 顶部公告栏 ============ */
.top-bar {
  background: var(--gradient-main);
  padding: 8px 0;
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.top-bar a { color: #fff; }
.top-bar a:hover { text-decoration: underline; }

/* ============ 导航栏 ============ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 26, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.nav-logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 8px;
}
.nav-logo-text {
  font-size: 20px;
  font-weight: 800;
  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-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--text-primary);
  background: rgba(108, 61, 232, 0.2);
}
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.btn-nav-login {
  background: var(--gradient-main);
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 20px !important;
  font-weight: 600 !important;
}
.btn-nav-login:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ============ 搜索框 ============ */
.search-bar-wrap {
  background: var(--dark-2);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.search-bar-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 700px;
  margin: 0 auto;
}
.search-bar-inner input {
  flex: 1;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 10px 20px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: var(--transition);
}
.search-bar-inner input::placeholder { color: var(--text-muted); }
.search-bar-inner input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108, 61, 232, 0.2);
}
.search-bar-inner button {
  background: var(--gradient-main);
  color: #fff;
  border-radius: 24px;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  white-space: nowrap;
}
.search-bar-inner button:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

/* ============ 面包屑 ============ */
.breadcrumb {
  padding: 14px 0;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--secondary); }
.breadcrumb span { margin: 0 8px; }

/* ============ Hero区域 ============ */
.hero {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.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(1.05);
  transition: transform 8s ease;
}
.hero:hover .hero-bg { transform: scale(1.0); }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,10,26,0.8) 0%, rgba(108,61,232,0.3) 50%, rgba(0,212,255,0.1) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(108, 61, 232, 0.3);
  border: 1px solid var(--primary);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 13px;
  color: var(--secondary);
  margin-bottom: 20px;
  backdrop-filter: blur(10px);
}
.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--secondary);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.hero h1 .brand { background: var(--gradient-main); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 560px;
}
.hero-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(108, 61, 232, 0.5);
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  padding: 14px 32px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  border: 2px solid rgba(255,255,255,0.3);
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-outline:hover {
  color: #fff;
  border-color: var(--primary);
  background: rgba(108, 61, 232, 0.2);
  transform: translateY(-3px);
}
.hero-stats {
  position: relative;
  z-index: 2;
  display: flex;
  gap: 40px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num {
  font-size: 2rem;
  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: var(--text-muted); margin-top: 4px; }

/* ============ 分区标题 ============ */
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 12px;
}
.section-header h2 .accent { color: var(--secondary); }
.section-header p { color: var(--text-secondary); font-size: 1rem; max-width: 600px; margin: 0 auto; }
.section-tag {
  display: inline-block;
  background: rgba(108, 61, 232, 0.2);
  border: 1px solid var(--primary);
  color: var(--primary-light);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* ============ 视频卡片 ============ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--dark-3);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.video-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 .video-play-btn { opacity: 1; }
.play-icon {
  width: 60px;
  height: 60px;
  background: rgba(108, 61, 232, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(108, 61, 232, 0.6);
}
.play-icon:hover { transform: scale(1.1); background: var(--primary); }
.play-icon svg { width: 24px; height: 24px; fill: #fff; margin-left: 4px; }
.video-duration {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
}
.video-info { padding: 16px; }
.video-info h3 {
  font-size: 15px;
  font-weight: 700;
  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: 12px;
  color: var(--text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-meta svg { width: 14px; height: 14px; fill: currentColor; }
.video-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
.video-tag {
  background: rgba(108, 61, 232, 0.15);
  color: var(--primary-light);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
  border: 1px solid rgba(108, 61, 232, 0.2);
}

/* ============ 分类导航 ============ */
.cat-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.cat-btn {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  cursor: pointer;
}
.cat-btn:hover, .cat-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

/* ============ 功能模块卡片 ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.feature-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
  text-align: center;
}
.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}
.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-main);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 28px;
}
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.feature-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }

/* ============ 专家卡片 ============ */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
}
.expert-avatar {
  position: relative;
  height: 220px;
  overflow: hidden;
}
.expert-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.5s ease;
}
.expert-card:hover .expert-avatar img { transform: scale(1.05); }
.expert-role-badge {
  position: absolute;
  bottom: 12px;
  left: 12px;
  background: var(--gradient-main);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
}
.expert-info { padding: 20px; }
.expert-info h3 { font-size: 17px; font-weight: 800; margin-bottom: 6px; }
.expert-info .title { font-size: 13px; color: var(--secondary); margin-bottom: 10px; }
.expert-info p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; }
.expert-awards { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.award-tag {
  background: rgba(255, 107, 53, 0.15);
  color: var(--accent);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
  border: 1px solid rgba(255, 107, 53, 0.2);
}
.expert-btns { display: flex; gap: 10px; }
.btn-sm {
  flex: 1;
  text-align: center;
  padding: 8px 12px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-sm-primary {
  background: var(--gradient-main);
  color: #fff;
}
.btn-sm-primary:hover { opacity: 0.9; color: #fff; transform: translateY(-1px); }
.btn-sm-outline {
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.btn-sm-outline:hover { border-color: var(--primary); color: var(--primary-light); }

/* ============ 合作品牌 ============ */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px;
}
.partner-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
}
.partner-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
}
.partner-logo {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 900;
  color: #fff;
}
.partner-card h4 { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.partner-card p { font-size: 12px; color: var(--text-muted); }

/* ============ 评价 ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.review-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}
.review-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.review-card::before {
  content: '"';
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 60px;
  color: rgba(108, 61, 232, 0.2);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-stars { color: #ffd700; font-size: 16px; margin-bottom: 12px; }
.review-text { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.reviewer {
  display: flex;
  align-items: center;
  gap: 12px;
}
.reviewer-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;
  color: #fff;
  flex-shrink: 0;
}
.reviewer-info h4 { font-size: 14px; font-weight: 700; }
.reviewer-info p { font-size: 12px; color: var(--text-muted); }

/* ============ FAQ ============ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--primary); }
.faq-question {
  padding: 20px 24px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq-question::after {
  content: '+';
  font-size: 22px;
  color: var(--primary);
  flex-shrink: 0;
  transition: var(--transition);
}
.faq-item.open .faq-question::after { transform: rotate(45deg); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ============ 联系区域 ============ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.contact-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.contact-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.contact-icon {
  width: 52px;
  height: 52px;
  background: var(--gradient-main);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 16px;
}
.contact-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.contact-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.6; }
.contact-card a { color: var(--secondary); }

/* ============ QR码区域 ============ */
.qr-grid {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  justify-content: center;
}
.qr-item { text-align: center; }
.qr-box {
  width: 120px;
  height: 120px;
  background: #fff;
  border-radius: var(--radius);
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
}
.qr-box canvas { width: 100%; height: 100%; }
.qr-item p { font-size: 13px; color: var(--text-secondary); }

/* ============ 社交分享 ============ */
.share-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: var(--card-bg);
}
.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: #69c9d0; }
.share-bilibili:hover { background: #00a1d6; border-color: #00a1d6; }

/* ============ 加入社区指南 ============ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  border: 1px solid var(--border);
  position: relative;
  transition: var(--transition);
}
.howto-step:hover { border-color: var(--primary); transform: translateY(-4px); }
.step-num {
  width: 40px;
  height: 40px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 900;
  color: #fff;
  margin-bottom: 16px;
}
.howto-step h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.howto-step p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* ============ 统计数字 ============ */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 24px;
}
.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.stat-num {
  font-size: 2.4rem;
  font-weight: 900;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.stat-label { font-size: 14px; color: var(--text-secondary); }

/* ============ 背景装饰 ============ */
.bg-dark-2 { background: var(--dark-2); }
.bg-dark-3 { background: var(--dark-3); }
.bg-gradient {
  background: linear-gradient(135deg, rgba(108,61,232,0.1) 0%, rgba(0,212,255,0.05) 100%);
}
.divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* ============ 页脚 ============ */
.footer {
  background: var(--dark-2);
  border-top: 1px solid var(--border);
  padding: 60px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand {}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.footer-logo img { width: 36px; height: 36px; object-fit: contain; border-radius: 8px; }
.footer-logo-text {
  font-size: 18px;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-brand p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-icon {
  width: 36px;
  height: 36px;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
  color: var(--text-secondary);
}
.social-icon:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
  font-size: 14px;
  color: var(--text-secondary);
  transition: var(--transition);
}
.footer-col ul li a:hover { color: var(--secondary); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-bottom a { color: var(--text-muted); }
.footer-bottom a:hover { color: var(--secondary); }

/* ============ 视频播放模态框 ============ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal-content {
  background: var(--dark-2);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 800px;
  width: 90%;
  border: 1px solid var(--border);
  position: relative;
}
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  background: var(--dark-3);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.modal-close:hover { background: var(--primary); color: #fff; }
.modal-video {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--dark);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.modal-video-placeholder {
  text-align: center;
}
.modal-video-placeholder .big-play {
  width: 80px;
  height: 80px;
  background: var(--gradient-main);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  animation: pulse-scale 2s infinite;
}
@keyframes pulse-scale {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}
.modal-video-placeholder .big-play svg { width: 32px; height: 32px; fill: #fff; margin-left: 6px; }
.modal-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.modal-desc { font-size: 14px; color: var(--text-secondary); }

/* ============ 直播入口 ============ */
.live-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 50, 50, 0.2);
  border: 1px solid rgba(255, 50, 50, 0.4);
  color: #ff5555;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
}
.live-dot {
  width: 8px;
  height: 8px;
  background: #ff5555;
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--dark-2);
    border-bottom: 1px solid var(--border);
    padding: 16px;
    gap: 4px;
    z-index: 999;
  }
  .nav-menu.open a { padding: 12px 16px; border-radius: 8px; }
  .hamburger { display: flex; }
  .navbar { position: relative; }
  .hero { min-height: 460px; }
  .hero h1 { font-size: 1.8rem; }
  .hero-stats { gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 50px 0; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .expert-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-btns { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .video-grid { grid-template-columns: 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; }
.fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-delay-3 { animation-delay: 0.3s; opacity: 0; }

/* ============ 内页横幅 ============ */
.page-hero {
  position: relative;
  padding: 80px 0 60px;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-dark);
  z-index: -1;
}
.page-hero::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(108,61,232,0.2) 0%, transparent 70%);
  z-index: -1;
}
.page-hero h1 { font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 900; margin-bottom: 12px; }
.page-hero p { font-size: 1rem; color: var(--text-secondary); max-width: 560px; }

/* ============ 标签页 ============ */
.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  overflow-x: auto;
}
.tab-btn {
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  cursor: pointer;
  background: none;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  color: var(--primary-light);
  border-bottom-color: var(--primary);
}

/* ============ 通知条 ============ */
.notice-bar {
  background: rgba(108, 61, 232, 0.1);
  border: 1px solid rgba(108, 61, 232, 0.2);
  border-radius: var(--radius);
  padding: 12px 20px;
  font-size: 14px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}
.notice-bar .icon { color: var(--primary-light); font-size: 16px; }

/* ============ 加载更多 ============ */
.load-more-wrap { text-align: center; margin-top: 40px; }
.btn-load-more {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary-light);
  padding: 12px 40px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
  cursor: pointer;
}
.btn-load-more:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}