/* ========================================
   抖阴游戏解说视频社区 - 主样式文件
   lqfilm.cn | 原创设计
   ======================================== */

/* CSS变量 */
:root {
  --primary: #7c3aed;
  --primary-dark: #5b21b6;
  --primary-light: #a78bfa;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --secondary: #1e1b4b;
  --bg-dark: #0f0e1a;
  --bg-card: #1a1830;
  --bg-card2: #231f3a;
  --text-primary: #f1f0ff;
  --text-secondary: #c4b5fd;
  --text-muted: #7c7a9e;
  --border: #312e6b;
  --gradient-hero: linear-gradient(135deg, #0f0e1a 0%, #1e1b4b 50%, #2d1b69 100%);
  --gradient-card: linear-gradient(145deg, #1a1830, #231f3a);
  --gradient-gold: linear-gradient(135deg, #f59e0b, #d97706, #fbbf24);
  --shadow-card: 0 8px 32px rgba(124, 58, 237, 0.15);
  --shadow-hover: 0 16px 48px rgba(124, 58, 237, 0.3);
  --radius: 12px;
  --radius-lg: 20px;
  --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: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 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: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button { cursor: pointer; border: none; outline: 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; }

/* ========================================
   顶部公告条
   ======================================== */
.top-bar {
  background: linear-gradient(90deg, var(--primary-dark), var(--primary), var(--primary-dark));
  background-size: 200% 100%;
  animation: shimmer 3s linear infinite;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  color: #fff;
  letter-spacing: 0.5px;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(15, 14, 26, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 20px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.nav-logo img.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  object-fit: cover;
}
.nav-logo .brand-name {
  font-size: 22px;
  font-weight: 900;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}
.nav-logo .brand-sub {
  font-size: 11px;
  color: var(--text-muted);
  display: block;
  margin-top: -4px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-menu a {
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 8px;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-menu a:hover, .nav-menu a.active {
  color: var(--accent);
  background: rgba(245, 158, 11, 0.1);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.btn-nav-login {
  background: var(--gradient-gold);
  color: #1a1200;
  font-size: 13px;
  font-weight: 700;
  padding: 7px 18px;
  border-radius: 20px;
  transition: var(--transition);
}
.btn-nav-login:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.4);
  color: #1a1200;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 4px;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ========================================
   搜索框
   ======================================== */
.search-bar-wrap {
  background: rgba(26, 24, 48, 0.9);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.search-form {
  display: flex;
  align-items: center;
  flex: 1;
  max-width: 640px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: 24px;
  overflow: hidden;
  transition: var(--transition);
}
.search-form:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}
.search-form input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 14px;
  padding: 10px 16px;
  font-family: inherit;
}
.search-form input::placeholder { color: var(--text-muted); }
.search-form button {
  background: var(--primary);
  color: #fff;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.search-form button:hover { background: var(--primary-dark); }
.search-hot {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.search-hot span { color: var(--text-muted); }
.search-hot a {
  color: var(--text-secondary);
  padding: 3px 10px;
  background: var(--bg-card2);
  border-radius: 12px;
  font-size: 12px;
  transition: var(--transition);
}
.search-hot a:hover { color: var(--accent); background: rgba(245,158,11,0.1); }

/* ========================================
   面包屑
   ======================================== */
.breadcrumb {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 20px;
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary-light); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--text-secondary); }

/* ========================================
   Hero Banner
   ======================================== */
.hero-banner {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-banner .hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  z-index: 0;
}
.hero-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,14,26,0.7) 0%, rgba(124,58,237,0.2) 50%, rgba(15,14,26,0.8) 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-flex;
  align-items: center;
  gap: 6px;
  background: rgba(124, 58, 237, 0.3);
  border: 1px solid var(--primary);
  color: var(--primary-light);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 20px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hero-content h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 0%, var(--primary-light) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat .num {
  font-size: 2rem;
  font-weight: 900;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.hero-stat .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}
.hero-btns {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn-primary {
  background: var(--gradient-gold);
  color: #1a1200;
  font-size: 15px;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 28px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
  color: #1a1200;
}
.btn-secondary {
  background: rgba(124, 58, 237, 0.2);
  border: 1px solid var(--primary);
  color: var(--primary-light);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 28px;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-secondary:hover {
  background: rgba(124, 58, 237, 0.35);
  transform: translateY(-2px);
  color: #fff;
}

/* ========================================
   通用容器与区块
   ======================================== */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}
.section {
  padding: 60px 0;
}
.section-alt {
  background: rgba(26, 24, 48, 0.5);
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  background: rgba(124, 58, 237, 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;
}
.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.section-header p {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ========================================
   视频卡片
   ======================================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.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: var(--shadow-hover);
  border-color: var(--primary);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--bg-card2);
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.video-card:hover .video-thumb img {
  transform: scale(1.05);
}
.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: 56px;
  height: 56px;
  background: rgba(245, 158, 11, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon {
  transform: scale(1);
}
.play-icon::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.video-info {
  padding: 14px;
}
.video-info h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.5;
  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: 12px;
  color: var(--text-muted);
}
.video-author {
  display: flex;
  align-items: center;
  gap: 6px;
}
.video-author img {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
}
.video-stats {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 8px;
}
.video-stats span { display: flex; align-items: center; gap: 3px; }

/* ========================================
   卡片通用
   ======================================== */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: var(--transition);
}
.card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-card);
  transform: translateY(-4px);
}
.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ========================================
   专家展示
   ======================================== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
}
.expert-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 16px;
  border: 3px solid var(--primary);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.4);
}
.expert-name {
  font-size: 18px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.expert-title {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 600;
}
.expert-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}
.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 16px;
}
.expert-tag {
  background: rgba(124, 58, 237, 0.2);
  border: 1px solid var(--border);
  color: var(--primary-light);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
}
.expert-btns {
  display: flex;
  gap: 8px;
  justify-content: center;
}
.btn-sm {
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 16px;
  transition: var(--transition);
}
.btn-sm.outline {
  border: 1px solid var(--primary);
  color: var(--primary-light);
  background: none;
}
.btn-sm.outline:hover {
  background: rgba(124, 58, 237, 0.2);
  color: #fff;
}
.btn-sm.solid {
  background: var(--primary);
  color: #fff;
}
.btn-sm.solid:hover {
  background: var(--primary-dark);
}

/* ========================================
   评价区
   ======================================== */
.reviews-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;
  position: relative;
}
.review-card::before {
  content: '"';
  position: absolute;
  top: 12px;
  right: 20px;
  font-size: 60px;
  color: var(--primary);
  opacity: 0.2;
  font-family: serif;
  line-height: 1;
}
.review-stars {
  display: flex;
  gap: 3px;
  margin-bottom: 12px;
}
.star { color: var(--accent); font-size: 16px; }
.review-text {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}
.review-user {
  display: flex;
  align-items: center;
  gap: 10px;
}
.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-user-info .name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}
.review-user-info .date {
  font-size: 12px;
  color: var(--text-muted);
}

/* ========================================
   FAQ
   ======================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: var(--transition);
  font-family: inherit;
}
.faq-q:hover { color: var(--accent); }
.faq-q .faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(124, 58, 237, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 16px;
  transition: var(--transition);
}
.faq-item.open .faq-icon { transform: rotate(45deg); background: var(--primary); }
.faq-a {
  display: none;
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.faq-item.open .faq-a { display: block; }

/* ========================================
   合作品牌Logo墙
   ======================================== */
.partner-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
}
.partner-item {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-muted);
  transition: var(--transition);
}
.partner-item:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(124, 58, 237, 0.1);
}
.partner-icon { font-size: 28px; margin-bottom: 8px; }

/* ========================================
   社区功能模块
   ======================================== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.community-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}
.community-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}
.community-card .icon { font-size: 36px; margin-bottom: 12px; }
.community-card h4 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.community-card p { font-size: 12px; color: var(--text-muted); }
.community-count { font-size: 18px; font-weight: 800; color: var(--accent); margin-top: 8px; }

/* ========================================
   AI功能区
   ======================================== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, rgba(124,58,237,0.1), rgba(30,27,75,0.8));
  border: 1px solid rgba(124,58,237,0.3);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.ai-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(124,58,237,0.15), transparent);
  border-radius: 50%;
}
.ai-card:hover {
  border-color: var(--primary);
  box-shadow: 0 8px 32px rgba(124,58,237,0.25);
  transform: translateY(-4px);
}
.ai-card-icon { font-size: 40px; margin-bottom: 16px; }
.ai-card h3 { font-size: 18px; font-weight: 800; color: var(--text-primary); margin-bottom: 10px; }
.ai-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; }
.ai-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), #a855f7);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
  margin-top: 12px;
  letter-spacing: 0.5px;
}

/* ========================================
   联系区
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 20px;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}
.contact-item-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: rgba(124, 58, 237, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.contact-item-text .label {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 2px;
}
.contact-item-text .value {
  font-size: 15px;
  color: var(--text-primary);
  font-weight: 600;
}
.qr-grid {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.qr-item {
  text-align: center;
}
.qr-item img {
  width: 120px;
  height: 120px;
  border-radius: 12px;
  border: 2px solid var(--border);
  margin: 0 auto 8px;
}
.qr-item p {
  font-size: 12px;
  color: var(--text-muted);
}

/* ========================================
   分享按钮
   ======================================== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 16px 0;
}
.share-label { font-size: 14px; color: var(--text-muted); }
.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);
  border: 1px solid transparent;
}
.share-btn:hover { transform: translateY(-2px); }
.share-wx { background: #07c160; color: #fff; }
.share-wb { background: #e6162d; color: #fff; }
.share-dy { background: #000; color: #fff; border-color: #333; }
.share-bili { background: #00a1d6; color: #fff; }
.share-qq { background: #1d7de3; color: #fff; }

/* ========================================
   页脚
   ======================================== */
.footer {
  background: #080714;
  border-top: 1px solid var(--border);
  padding: 48px 20px 24px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.footer-top {
  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: 16px;
}
.footer-brand .logo-wrap img {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  object-fit: cover;
}
.footer-brand .brand-name {
  font-size: 20px;
  font-weight: 900;
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-brand p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.social-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-card2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
  color: var(--text-muted);
}
.social-icon:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}
.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.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 {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-links {
  display: flex;
  gap: 16px;
}
.footer-links a {
  font-size: 13px;
  color: var(--text-muted);
}
.footer-links a:hover { color: var(--primary-light); }
.update-time {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-card2);
  padding: 4px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
}

/* ========================================
   标签页/Tab
   ======================================== */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-card2);
  border-radius: 12px;
  padding: 4px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.tab-btn {
  flex: 1;
  min-width: 80px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  transition: var(--transition);
  font-family: inherit;
  white-space: nowrap;
}
.tab-btn.active, .tab-btn:hover {
  background: var(--primary);
  color: #fff;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ========================================
   热门标签
   ======================================== */
.hot-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.hot-tag {
  background: var(--bg-card2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 13px;
  padding: 5px 14px;
  border-radius: 16px;
  transition: var(--transition);
  cursor: pointer;
}
.hot-tag:hover, .hot-tag.active {
  background: rgba(124, 58, 237, 0.2);
  border-color: var(--primary);
  color: var(--primary-light);
}

/* ========================================
   通知/公告条
   ======================================== */
.notice-bar {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
  border-radius: var(--radius);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.notice-icon { font-size: 20px; flex-shrink: 0; }
.notice-text { font-size: 14px; color: var(--text-secondary); }
.notice-text strong { color: var(--accent); }

/* ========================================
   加载更多按钮
   ======================================== */
.load-more-wrap { text-align: center; margin-top: 36px; }
.btn-load-more {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 36px;
  border-radius: 24px;
  transition: var(--transition);
  font-family: inherit;
}
.btn-load-more:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(124, 58, 237, 0.1);
}

/* ========================================
   内页样式
   ======================================== */
.page-hero {
  background: var(--gradient-hero);
  padding: 48px 20px;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.page-hero p {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto;
}

/* ========================================
   响应式
   ======================================== */
@media (max-width: 1024px) {
  .footer-top { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-menu { display: none; }
  .nav-menu.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(15, 14, 26, 0.98);
    padding: 20px;
    border-bottom: 1px solid var(--border);
    z-index: 999;
    gap: 4px;
  }
  .hamburger { display: flex; }
  .hero-banner { min-height: 380px; }
  .hero-stats { gap: 20px; }
  .footer-top { 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(200px, 1fr)); }
  .search-hot { display: none; }
}
@media (max-width: 480px) {
  .video-grid { grid-template-columns: 1fr; }
  .hero-btns { flex-direction: column; }
  .tabs { overflow-x: auto; }
}

/* ========================================
   动画
   ======================================== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}
.fade-in-up { animation: fadeInUp 0.6s ease both; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* 懒加载占位 */
img[loading="lazy"] {
  background: var(--bg-card2);
}

/* 视频卡片hover特效 */
.video-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border: 2px solid transparent;
  transition: var(--transition);
  pointer-events: none;
}
.video-card:hover::after {
  border-color: var(--primary);
}
.video-card { position: relative; }