/* =====================================================
   糖心vlog - 主样式文件
   品牌：糖心vlog | 域名：firtv.cn
   原创设计，版权所有 © 2025 糖心vlog
   ===================================================== */

/* ---- CSS变量 ---- */
:root {
  --color-primary: #7c3aed;
  --color-primary-dark: #5b21b6;
  --color-secondary: #06b6d4;
  --color-accent: #f59e0b;
  --color-bg: #0f0c1a;
  --color-bg2: #1a1530;
  --color-bg3: #221d3a;
  --color-card: #1e1a32;
  --color-border: #2d2850;
  --color-text: #e2e0f0;
  --color-text-muted: #9b97b8;
  --color-white: #ffffff;
  --color-neon-purple: #a855f7;
  --color-neon-blue: #38bdf8;
  --color-neon-pink: #ec4899;
  --font-main: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(124, 58, 237, 0.15);
  --shadow-lg: 0 8px 40px rgba(124, 58, 237, 0.25);
  --transition: 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: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: var(--color-neon-blue); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-neon-purple); }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg2); }
::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 3px; }

/* =====================================================
   顶部公告栏
   ===================================================== */
.top-bar {
  background: linear-gradient(90deg, var(--color-primary-dark), var(--color-primary), var(--color-secondary));
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: 13px;
  letter-spacing: 0.5px;
}
.top-bar a { color: #fff; font-weight: 600; }

/* =====================================================
   导航栏
   ===================================================== */
.site-header {
  background: rgba(15, 12, 26, 0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 20px rgba(0,0,0,0.4);
}
.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img.logo-img {
  height: 44px;
  width: auto;
  border-radius: 8px;
}
.site-logo img.favicon-img {
  height: 28px;
  width: 28px;
  border-radius: 6px;
}
.logo-text {
  font-size: 20px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-neon-purple), var(--color-neon-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

/* 主导航 */
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  color: var(--color-text);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--color-neon-purple);
  background: rgba(124, 58, 237, 0.12);
}

/* 搜索框 */
.header-search {
  display: flex;
  align-items: center;
  background: var(--color-bg3);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  padding: 6px 16px;
  gap: 8px;
  min-width: 200px;
  transition: var(--transition);
}
.header-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}
.header-search input {
  background: none;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 14px;
  width: 100%;
  font-family: var(--font-main);
}
.header-search input::placeholder { color: var(--color-text-muted); }
.header-search button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  padding: 0;
  display: flex;
  align-items: center;
  transition: var(--transition);
}
.header-search button:hover { color: var(--color-neon-purple); }

/* 汉堡菜单 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* =====================================================
   搜索栏（导航下方）
   ===================================================== */
.search-bar-section {
  background: var(--color-bg2);
  border-bottom: 1px solid var(--color-border);
  padding: 12px 24px;
}
.search-bar-inner {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  background: var(--color-bg3);
  border: 1.5px solid var(--color-border);
  border-radius: 30px;
  overflow: hidden;
  transition: var(--transition);
}
.search-bar-inner:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}
.search-bar-inner input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--color-text);
  font-size: 15px;
  padding: 12px 20px;
  font-family: var(--font-main);
}
.search-bar-inner input::placeholder { color: var(--color-text-muted); }
.search-bar-inner button {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border: none;
  color: #fff;
  padding: 12px 28px;
  font-size: 15px;
  cursor: pointer;
  font-family: var(--font-main);
  font-weight: 600;
  transition: var(--transition);
}
.search-bar-inner button:hover { opacity: 0.9; }

/* =====================================================
   Hero Banner
   ===================================================== */
.hero-banner {
  position: relative;
  min-height: 580px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner_bg.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(0.45);
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(124,58,237,0.55) 0%, rgba(6,182,212,0.25) 60%, transparent 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}
.hero-badge {
  display: inline-block;
  background: rgba(124, 58, 237, 0.3);
  border: 1px solid var(--color-neon-purple);
  color: var(--color-neon-purple);
  padding: 6px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 1px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  color: #fff;
}
.hero-title .brand {
  background: linear-gradient(135deg, var(--color-neon-purple), var(--color-neon-blue), var(--color-neon-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: rgba(255,255,255,0.8);
  max-width: 680px;
  margin: 0 auto 36px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 36px;
  flex-wrap: wrap;
}
.hero-stat {
  text-align: center;
}
.hero-stat .num {
  font-size: 2rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--color-neon-purple), var(--color-neon-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.hero-stat .label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
}
.hero-btns {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* =====================================================
   按钮
   ===================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 30px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
  font-family: var(--font-main);
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(124, 58, 237, 0.5);
  color: #fff;
}
.btn-outline {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.4);
  color: #fff;
}
.btn-outline:hover {
  border-color: var(--color-neon-purple);
  background: rgba(124, 58, 237, 0.15);
  color: var(--color-neon-purple);
  transform: translateY(-2px);
}
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* =====================================================
   通用区块
   ===================================================== */
.section {
  padding: 70px 24px;
}
.section-alt { background: var(--color-bg2); }
.section-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-tag {
  display: inline-block;
  background: rgba(124, 58, 237, 0.15);
  border: 1px solid rgba(124, 58, 237, 0.4);
  color: var(--color-neon-purple);
  padding: 4px 14px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--color-white);
  margin-bottom: 12px;
  line-height: 1.3;
}
.section-title .brand { color: var(--color-neon-purple); }
.section-desc {
  color: var(--color-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(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: var(--transition);
  cursor: pointer;
}
.video-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-bg3);
}
.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); }
.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(124, 58, 237, 0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
  transform: scale(0.8);
  transition: var(--transition);
}
.video-card:hover .play-icon { transform: scale(1); }
.play-icon svg { width: 24px; height: 24px; fill: #fff; 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 8px;
  border-radius: 4px;
}
.video-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: var(--color-primary);
  color: #fff;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.video-info {
  padding: 14px 16px;
}
.video-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-white);
  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;
  gap: 12px;
  font-size: 12px;
  color: var(--color-text-muted);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-author {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
}
.author-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: #fff;
  font-weight: 700;
  flex-shrink: 0;
}
.author-name { font-size: 12px; color: var(--color-text-muted); }

/* =====================================================
   功能模块卡片
   ===================================================== */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.module-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}
.module-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}
.module-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, rgba(124,58,237,0.2), rgba(6,182,212,0.2));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}
.module-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}
.module-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* =====================================================
   专家展示
   ===================================================== */
.expert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.expert-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
}
.expert-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}
.expert-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  border: 3px solid var(--color-border);
}
.expert-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 4px;
}
.expert-role {
  font-size: 12px;
  color: var(--color-neon-purple);
  font-weight: 600;
  margin-bottom: 10px;
}
.expert-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 14px;
}
.expert-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  margin-bottom: 14px;
}
.expert-tag {
  background: rgba(124,58,237,0.15);
  border: 1px solid rgba(124,58,237,0.3);
  color: var(--color-neon-purple);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 8px;
}
.expert-btns { display: flex; gap: 8px; justify-content: center; }

/* =====================================================
   FAQ
   ===================================================== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.active { border-color: var(--color-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(--color-white);
  gap: 12px;
}
.faq-question:hover { color: var(--color-neon-purple); }
.faq-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(124,58,237,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  color: var(--color-neon-purple);
  font-size: 16px;
  font-weight: 700;
}
.faq-item.active .faq-icon { background: var(--color-primary); color: #fff; transform: rotate(45deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.faq-item.active .faq-answer { max-height: 300px; }
.faq-answer-inner {
  padding: 0 24px 18px;
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

/* =====================================================
   用户评论
   ===================================================== */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.review-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: var(--transition);
}
.review-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.review-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.review-name { font-size: 14px; font-weight: 700; color: var(--color-white); }
.review-date { font-size: 12px; color: var(--color-text-muted); }
.review-stars { color: var(--color-accent); font-size: 14px; margin-bottom: 10px; }
.review-text { font-size: 13px; color: var(--color-text-muted); line-height: 1.7; }
.review-game {
  display: inline-block;
  margin-top: 10px;
  background: rgba(6,182,212,0.1);
  border: 1px solid rgba(6,182,212,0.3);
  color: var(--color-secondary);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 8px;
}

/* =====================================================
   合作品牌Logo墙
   ===================================================== */
.partner-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px 24px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-muted);
  transition: var(--transition);
  min-width: 120px;
  text-align: center;
}
.partner-item:hover {
  color: var(--color-white);
  border-color: var(--color-primary);
  background: rgba(124,58,237,0.1);
}

/* =====================================================
   社区功能区
   ===================================================== */
.community-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}
.community-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
  cursor: pointer;
}
.community-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-secondary);
  box-shadow: 0 4px 20px rgba(6,182,212,0.15);
}
.community-emoji { font-size: 36px; margin-bottom: 12px; }
.community-name { font-size: 15px; font-weight: 700; color: var(--color-white); margin-bottom: 6px; }
.community-count { font-size: 12px; color: var(--color-text-muted); }

/* =====================================================
   AI赋能区
   ===================================================== */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, var(--color-card), rgba(124,58,237,0.08));
  border: 1px solid rgba(124,58,237,0.25);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  transition: var(--transition);
}
.ai-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow);
}
.ai-icon { font-size: 36px; margin-bottom: 14px; }
.ai-title { font-size: 17px; font-weight: 700; color: var(--color-white); margin-bottom: 10px; }
.ai-desc { font-size: 13px; color: var(--color-text-muted); line-height: 1.7; }
.ai-features { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 6px; }
.ai-feature-tag {
  background: rgba(124,58,237,0.12);
  border: 1px solid rgba(124,58,237,0.25);
  color: var(--color-neon-purple);
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 10px;
}

/* =====================================================
   联系我们
   ===================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-info-title { font-size: 20px; font-weight: 800; color: var(--color-white); margin-bottom: 20px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}
.contact-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.contact-icon {
  width: 40px;
  height: 40px;
  background: rgba(124,58,237,0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
.contact-label { font-size: 12px; color: var(--color-text-muted); margin-bottom: 4px; }
.contact-value { font-size: 14px; color: var(--color-white); font-weight: 600; }

/* QR码区域 */
.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.qr-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.qr-card img {
  width: 140px;
  height: 140px;
  margin: 0 auto 12px;
  border-radius: 8px;
}
.qr-label { font-size: 13px; color: var(--color-text-muted); }
.qr-title { font-size: 15px; font-weight: 700; color: var(--color-white); margin-bottom: 4px; }

/* =====================================================
   社交分享
   ===================================================== */
.share-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.share-label { font-size: 14px; color: var(--color-text-muted); font-weight: 600; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}
.share-wechat { background: #07c160; color: #fff; }
.share-weibo { background: #e6162d; color: #fff; }
.share-douyin { background: #010101; color: #fff; border: 1px solid #333; }
.share-bilibili { background: #00a1d6; color: #fff; }
.share-qq { background: #1d7fd4; color: #fff; }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; color: #fff; }

/* =====================================================
   面包屑
   ===================================================== */
.breadcrumb {
  background: var(--color-bg2);
  padding: 12px 24px;
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}
.breadcrumb-inner a { color: var(--color-text-muted); }
.breadcrumb-inner a:hover { color: var(--color-neon-purple); }
.breadcrumb-sep { color: var(--color-border); }
.breadcrumb-current { color: var(--color-neon-purple); font-weight: 600; }

/* =====================================================
   页脚
   ===================================================== */
.site-footer {
  background: var(--color-bg2);
  border-top: 1px solid var(--color-border);
  padding: 60px 24px 30px;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo-text { font-size: 22px; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: 13px; color: var(--color-text-muted); line-height: 1.8; margin-bottom: 16px; }
.footer-col-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 13px; color: var(--color-text-muted); transition: var(--transition); }
.footer-links a:hover { color: var(--color-neon-purple); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--color-text-muted);
}
.footer-bottom a { color: var(--color-text-muted); }
.footer-bottom a:hover { color: var(--color-neon-purple); }
.footer-logo-img {
  height: 36px;
  width: auto;
  border-radius: 6px;
  margin-bottom: 12px;
}

/* =====================================================
   页面内容区
   ===================================================== */
.page-hero {
  background: linear-gradient(135deg, var(--color-bg2), var(--color-bg3));
  padding: 60px 24px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 50%, rgba(124,58,237,0.08) 0%, transparent 60%);
  pointer-events: none;
}
.page-hero-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  color: var(--color-white);
  margin-bottom: 12px;
  position: relative;
}
.page-hero-desc {
  font-size: 15px;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  position: relative;
}

/* =====================================================
   标签筛选
   ===================================================== */
.filter-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.filter-tab {
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  color: var(--color-text-muted);
  transition: var(--transition);
}
.filter-tab:hover,
.filter-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* =====================================================
   关于我们
   ===================================================== */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.about-img { border-radius: var(--radius-lg); overflow: hidden; }
.about-img img { width: 100%; height: 360px; object-fit: cover; }
.about-text h2 { font-size: 2rem; font-weight: 800; color: var(--color-white); margin-bottom: 16px; }
.about-text p { font-size: 14px; color: var(--color-text-muted); line-height: 1.9; margin-bottom: 14px; }
.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.about-stat {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}
.about-stat .num { font-size: 1.8rem; font-weight: 900; color: var(--color-neon-purple); display: block; }
.about-stat .label { font-size: 12px; color: var(--color-text-muted); }

/* =====================================================
   加载动画
   ===================================================== */
.skeleton {
  background: linear-gradient(90deg, var(--color-card) 25%, var(--color-bg3) 50%, var(--color-card) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 8px;
}
@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; }
  .about-intro { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px;
    gap: 4px;
    z-index: 999;
  }
  .menu-toggle { display: flex; }
  .header-search { display: none; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .qr-grid { grid-template-columns: 1fr 1fr; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .section { padding: 48px 16px; }
}

@media (max-width: 480px) {
  .hero-banner { min-height: 420px; }
  .hero-btns { flex-direction: column; align-items: center; }
  .video-grid { grid-template-columns: 1fr; }
  .module-grid { grid-template-columns: repeat(2, 1fr); }
  .expert-grid { grid-template-columns: repeat(2, 1fr); }
  .qr-grid { grid-template-columns: 1fr; }
}

/* =====================================================
   工具类
   ===================================================== */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.hidden { display: none; }
.neon-text {
  background: linear-gradient(135deg, var(--color-neon-purple), var(--color-neon-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}