/* ============================================
   里番网 - 完全原创设计系统
   品牌色：电光蓝 + 霓虹紫 + 暗夜黑
   ============================================ */
:root {
  --55a6z-primary: #6C5CE7;
  --55a6z-primary-light: #A29BFE;
  --55a6z-primary-dark: #4834D4;
  --55a6z-secondary: #0D0D1A;
  --55a6z-accent: #00D2FF;
  --55a6z-accent2: #FF6B9D;
  --55a6z-bg-dark: #0A0A12;
  --55a6z-bg-card: #14142B;
  --55a6z-bg-card-hover: #1E1E3F;
  --55a6z-text-white: #F0F0F5;
  --55a6z-text-light: #B8B8CC;
  --55a6z-text-muted: #6E6E8A;
  --55a6z-border: #2A2A4A;
  --55a6z-shadow: 0 4px 20px rgba(108,92,231,0.15);
  --55a6z-shadow-lg: 0 8px 40px rgba(108,92,231,0.25);
  --55a6z-gradient: linear-gradient(135deg, #6C5CE7 0%, #00D2FF 100%);
  --55a6z-gradient-dark: linear-gradient(180deg, #0A0A12 0%, #14142B 100%);
  --55a6z-radius: 10px;
  --55a6z-radius-lg: 18px;
  --55a6z-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--55a6z-bg-dark);
  color: var(--55a6z-text-light);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--55a6z-accent); text-decoration: none; transition: var(--55a6z-transition); }
a:hover { color: var(--55a6z-primary-light); }

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

/* === 容器 === */
.76g977u-container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* === 头部导航 === */
.76g977u-header {
  position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
  background: rgba(10,10,18,0.92); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--55a6z-border);
  transition: var(--55a6z-transition);
}
.76g977u-header-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 0 20px; height: 64px;
}
.76g977u-logo { display: flex; align-items: center; gap: 10px; }
.76g977u-logo img { height: 40px; width: auto; }
.76g977u-logo span { font-size: 1.3rem; font-weight: 800; background: var(--55a6z-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.76g977u-nav { display: flex; gap: 6px; list-style: none; }
.76g977u-nav a {
  display: block; padding: 8px 16px; border-radius: 8px; font-size: 0.92rem;
  color: var(--55a6z-text-light); font-weight: 500;
}
.76g977u-nav a:hover, .76g977u-nav a.active { background: rgba(108,92,231,0.15); color: var(--55a6z-accent); }
.76g977u-menu-toggle { display: none; background: none; border: none; color: var(--55a6z-text-white); font-size: 1.5rem; cursor: pointer; }

/* === 搜索框 === */
.76g977u-search-wrap {
  background: var(--55a6z-secondary); border-bottom: 1px solid var(--55a6z-border);
  padding: 14px 0; margin-top: 64px;
}
.76g977u-search-bar {
  display: flex; max-width: 600px; margin: 0 auto;
  background: var(--55a6z-bg-card); border: 1px solid var(--55a6z-border);
  border-radius: 30px; overflow: hidden;
}
.76g977u-search-bar input {
  flex: 1; padding: 12px 22px; background: transparent; border: none;
  color: var(--55a6z-text-white); font-size: 0.95rem; outline: none;
}
.76g977u-search-bar input::placeholder { color: var(--55a6z-text-muted); }
.76g977u-search-bar button {
  padding: 12px 28px; background: var(--55a6z-gradient); border: none;
  color: #fff; font-size: 0.95rem; cursor: pointer; font-weight: 600;
  transition: var(--55a6z-transition);
}
.76g977u-search-bar button:hover { opacity: 0.85; }

/* === Hero区域 === */
.76g977u-hero {
  position: relative; min-height: 520px; display: flex; align-items: center;
  overflow: hidden;
}
.76g977u-hero-bg {
  position: absolute; inset: 0; background-size: cover; background-position: center;
  filter: brightness(0.35) saturate(1.2);
}
.76g977u-hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,10,18,0.6) 0%, rgba(10,10,18,0.95) 100%);
}
.76g977u-hero-content {
  position: relative; z-index: 2; max-width: 700px; padding: 60px 20px;
}
.76g977u-hero-content h1 { font-size: 2.6rem; font-weight: 900; color: #fff; margin-bottom: 16px; line-height: 1.3; }
.76g977u-hero-content h1 em { font-style: normal; background: var(--55a6z-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.76g977u-hero-content p { font-size: 1.1rem; color: var(--55a6z-text-light); margin-bottom: 28px; max-width: 560px; }
.76g977u-hero-btns { display: flex; gap: 14px; flex-wrap: wrap; }
.76g977u-hero-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 22px; }

/* === 按钮 === */
.76g977u-btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px;
  border-radius: 30px; font-size: 0.95rem; font-weight: 600;
  transition: var(--55a6z-transition); cursor: pointer; border: none;
}
.76g977u-btn-primary { background: var(--55a6z-gradient); color: #fff; }
.76g977u-btn-primary:hover { transform: translateY(-2px); box-shadow: var(--55a6z-shadow-lg); color: #fff; }
.76g977u-btn-outline {
  background: transparent; color: var(--55a6z-accent);
  border: 2px solid var(--55a6z-accent);
}
.76g977u-btn-outline:hover { background: rgba(0,210,255,0.1); }
.76g977u-btn-sm { padding: 8px 18px; font-size: 0.85rem; border-radius: 20px; }

/* === 标签 === */
.76g977u-tag {
  display: inline-block; padding: 5px 14px; border-radius: 20px; font-size: 0.8rem;
  background: rgba(108,92,231,0.15); color: var(--55a6z-primary-light); font-weight: 500;
}
.76g977u-tags { display: flex; gap: 8px; flex-wrap: wrap; }

/* === 通用区块 === */
.76g977u-section { padding: 60px 0; }
.76g977u-section-title {
  font-size: 1.8rem; font-weight: 800; color: var(--55a6z-text-white);
  margin-bottom: 12px; text-align: center;
}
.76g977u-section-title em { font-style: normal; background: var(--55a6z-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.76g977u-section-desc { text-align: center; color: var(--55a6z-text-muted); margin-bottom: 40px; font-size: 1rem; }

/* === 视频卡片 === */
.76g977u-video-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px;
}
.76g977u-video-card {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius-lg);
  overflow: hidden; transition: var(--55a6z-transition);
  border: 1px solid transparent;
}
.76g977u-video-card:hover {
  transform: translateY(-6px); border-color: var(--55a6z-primary);
  box-shadow: var(--55a6z-shadow-lg);
}
.76g977u-video-thumb {
  position: relative; padding-top: 56.25%; overflow: hidden; cursor: pointer;
}
.76g977u-video-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.76g977u-video-card:hover .76g977u-video-thumb img { transform: scale(1.08); }
.76g977u-video-play {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(10,10,18,0.5); opacity: 0; transition: var(--55a6z-transition);
}
.76g977u-video-play::after {
  content: "▶"; font-size: 2.5rem; color: #fff;
  width: 60px; height: 60px; display: flex; align-items: center; justify-content: center;
  border-radius: 50%; background: var(--55a6z-gradient);
  box-shadow: 0 0 30px rgba(108,92,231,0.5);
}
.76g977u-video-card:hover .76g977u-video-play { opacity: 1; }
.76g977u-video-duration {
  position: absolute; bottom: 8px; right: 8px; background: rgba(0,0,0,0.75);
  color: #fff; padding: 2px 8px; border-radius: 4px; font-size: 0.78rem;
}
.76g977u-video-info { padding: 14px 16px; }
.76g977u-video-info h3 { font-size: 0.95rem; color: var(--55a6z-text-white); margin-bottom: 6px; font-weight: 600; line-height: 1.4; }
.76g977u-video-meta { display: flex; gap: 14px; font-size: 0.8rem; color: var(--55a6z-text-muted); }

/* === 特色功能卡片 === */
.76g977u-feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.76g977u-feature-card {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius-lg);
  padding: 32px 24px; text-align: center; transition: var(--55a6z-transition);
  border: 1px solid var(--55a6z-border);
}
.76g977u-feature-card:hover { border-color: var(--55a6z-primary); transform: translateY(-4px); box-shadow: var(--55a6z-shadow); }
.76g977u-feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.76g977u-feature-card h3 { font-size: 1.1rem; color: var(--55a6z-text-white); margin-bottom: 10px; }
.76g977u-feature-card p { font-size: 0.9rem; color: var(--55a6z-text-muted); }

/* === AI赋能 === */
.76g977u-ai-section {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center;
}
.76g977u-ai-img { border-radius: var(--55a6z-radius-lg); overflow: hidden; }
.76g977u-ai-img img { width: 100%; transition: transform 0.5s; }
.76g977u-ai-img:hover img { transform: scale(1.03); }
.76g977u-ai-content h2 { font-size: 1.6rem; color: var(--55a6z-text-white); margin-bottom: 16px; }
.76g977u-ai-list { list-style: none; }
.76g977u-ai-list li { padding: 10px 0; padding-left: 28px; position: relative; color: var(--55a6z-text-light); }
.76g977u-ai-list li::before { content: "✦"; position: absolute; left: 0; color: var(--55a6z-accent); }

/* === 专家团队 === */
.76g977u-expert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.76g977u-expert-card {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius-lg);
  padding: 28px 20px; text-align: center; transition: var(--55a6z-transition);
  border: 1px solid var(--55a6z-border);
}
.76g977u-expert-card:hover { border-color: var(--55a6z-accent); transform: translateY(-4px); }
.76g977u-expert-avatar {
  width: 90px; height: 90px; border-radius: 50%; margin: 0 auto 14px;
  overflow: hidden; border: 3px solid var(--55a6z-primary);
}
.76g977u-expert-avatar img { width: 100%; height: 100%; object-fit: cover; }
.76g977u-expert-info h3 { font-size: 1rem; color: var(--55a6z-text-white); margin-bottom: 4px; }
.76g977u-expert-role { font-size: 0.85rem; color: var(--55a6z-accent); margin-bottom: 10px; }
.76g977u-expert-card p { font-size: 0.82rem; color: var(--55a6z-text-muted); margin-bottom: 14px; }
.76g977u-expert-btns { display: flex; gap: 8px; justify-content: center; }

/* === FAQ === */
.76g977u-faq-list { max-width: 800px; margin: 0 auto; }
.76g977u-faq-item {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius);
  margin-bottom: 12px; border: 1px solid var(--55a6z-border); overflow: hidden;
}
.76g977u-faq-q {
  padding: 18px 22px; font-weight: 600; color: var(--55a6z-text-white);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
}
.76g977u-faq-q::after { content: "+"; font-size: 1.3rem; color: var(--55a6z-accent); transition: var(--55a6z-transition); }
.76g977u-faq-item.active .76g977u-faq-q::after { transform: rotate(45deg); }
.76g977u-faq-a { padding: 0 22px 18px; color: var(--55a6z-text-muted); font-size: 0.92rem; display: none; }
.76g977u-faq-item.active .76g977u-faq-a { display: block; }

/* === 用户评论 === */
.76g977u-review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.76g977u-review-card {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius-lg);
  padding: 24px; border: 1px solid var(--55a6z-border);
}
.76g977u-review-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.76g977u-review-avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--55a6z-gradient); display: flex; align-items: center; justify-content: center; color: #fff; font-weight: 700; }
.76g977u-review-name { font-weight: 600; color: var(--55a6z-text-white); font-size: 0.95rem; }
.76g977u-review-date { font-size: 0.78rem; color: var(--55a6z-text-muted); }
.76g977u-review-stars { color: #FFD700; margin-bottom: 10px; font-size: 0.9rem; }
.76g977u-review-text { font-size: 0.9rem; color: var(--55a6z-text-light); line-height: 1.6; }

/* === 合作品牌 === */
.76g977u-brand-wall {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 30px;
  padding: 20px 0;
}
.76g977u-brand-item {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius);
  padding: 16px 28px; border: 1px solid var(--55a6z-border);
  font-size: 1rem; color: var(--55a6z-text-muted); font-weight: 600;
  transition: var(--55a6z-transition);
}
.76g977u-brand-item:hover { border-color: var(--55a6z-primary); color: var(--55a6z-text-white); }

/* === 联系我们 === */
.76g977u-contact-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
}
.76g977u-contact-item {
  display: flex; align-items: center; gap: 14px;
  background: var(--55a6z-bg-card); padding: 18px 20px;
  border-radius: var(--55a6z-radius); border: 1px solid var(--55a6z-border);
}
.76g977u-contact-icon { font-size: 1.5rem; }
.76g977u-contact-info strong { display: block; color: var(--55a6z-text-white); font-size: 0.9rem; }
.76g977u-contact-info span { font-size: 0.85rem; color: var(--55a6z-text-muted); }
.76g977u-qrcode-wrap { display: flex; gap: 30px; justify-content: center; margin-top: 30px; }
.76g977u-qrcode-box { text-align: center; }
.76g977u-qrcode-box img { width: 130px; height: 130px; border-radius: var(--55a6z-radius); margin-bottom: 8px; }
.76g977u-qrcode-box p { font-size: 0.85rem; color: var(--55a6z-text-muted); }

/* === How-To === */
.76g977u-howto-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.76g977u-howto-step {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius-lg);
  padding: 28px 20px; text-align: center; border: 1px solid var(--55a6z-border);
  position: relative;
}
.76g977u-howto-num {
  width: 40px; height: 40px; border-radius: 50%; background: var(--55a6z-gradient);
  color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center;
  margin: 0 auto 14px; font-size: 1.1rem;
}
.76g977u-howto-step h3 { font-size: 1rem; color: var(--55a6z-text-white); margin-bottom: 8px; }
.76g977u-howto-step p { font-size: 0.85rem; color: var(--55a6z-text-muted); }

/* === 社交分享 === */
.76g977u-share {
  display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; padding: 20px 0;
}
.76g977u-share a {
  display: flex; align-items: center; gap: 8px; padding: 10px 22px;
  border-radius: 30px; font-size: 0.9rem; font-weight: 500;
  background: var(--55a6z-bg-card); border: 1px solid var(--55a6z-border);
  color: var(--55a6z-text-light);
}
.76g977u-share a:hover { border-color: var(--55a6z-primary); color: var(--55a6z-text-white); }

/* === 面包屑 === */
.76g977u-breadcrumb {
  padding: 14px 0; font-size: 0.85rem; color: var(--55a6z-text-muted);
}
.76g977u-breadcrumb a { color: var(--55a6z-accent); }
.76g977u-breadcrumb span { margin: 0 6px; }

/* === 页脚 === */
.76g977u-footer {
  background: var(--55a6z-secondary); border-top: 1px solid var(--55a6z-border);
  padding: 50px 0 0;
}
.76g977u-footer-inner {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  max-width: 1200px; margin: 0 auto; padding: 0 20px;
}
.76g977u-footer-brand p { font-size: 0.88rem; color: var(--55a6z-text-muted); margin-top: 12px; line-height: 1.7; }
.76g977u-footer-col h4 { font-size: 1rem; color: var(--55a6z-text-white); margin-bottom: 16px; font-weight: 700; }
.76g977u-footer-col a { display: block; padding: 4px 0; color: var(--55a6z-text-muted); font-size: 0.88rem; }
.76g977u-footer-col a:hover { color: var(--55a6z-accent); }
.76g977u-footer-social { display: flex; gap: 12px; margin-top: 16px; }
.76g977u-footer-social a {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--55a6z-bg-card); border: 1px solid var(--55a6z-border);
  display: flex; align-items: center; justify-content: center; font-size: 1rem;
}
.76g977u-footer-social a:hover { border-color: var(--55a6z-primary); background: rgba(108,92,231,0.15); }
.76g977u-footer-bottom {
  text-align: center; padding: 22px 0; margin-top: 40px;
  border-top: 1px solid var(--55a6z-border); font-size: 0.82rem; color: var(--55a6z-text-muted);
}

/* === 回到顶部 === */
.76g977u-back-top {
  position: fixed; bottom: 30px; right: 30px; width: 46px; height: 46px;
  border-radius: 50%; background: var(--55a6z-gradient); color: #fff;
  display: none; align-items: center; justify-content: center;
  font-size: 1.2rem; cursor: pointer; z-index: 999;
  box-shadow: var(--55a6z-shadow); transition: var(--55a6z-transition); border: none;
}
.76g977u-back-top:hover { transform: translateY(-3px); box-shadow: var(--55a6z-shadow-lg); }

/* === 懒加载 === */
.76g977u-lazy { opacity: 0; transition: opacity 0.5s; }
.76g977u-lazy.loaded { opacity: 1; }

/* === 内页 === */
.76g977u-page-hero {
  background: var(--55a6z-gradient-dark); padding: 100px 0 40px;
  text-align: center;
}
.76g977u-page-hero h1 { font-size: 2.2rem; color: var(--55a6z-text-white); margin-bottom: 12px; }
.76g977u-page-hero p { color: var(--55a6z-text-muted); font-size: 1rem; }
.76g977u-page-content { padding: 40px 0 60px; }

/* === 社区卡片 === */
.76g977u-community-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.76g977u-community-card {
  background: var(--55a6z-bg-card); border-radius: var(--55a6z-radius-lg);
  overflow: hidden; border: 1px solid var(--55a6z-border); transition: var(--55a6z-transition);
}
.76g977u-community-card:hover { border-color: var(--55a6z-accent2); transform: translateY(-4px); }
.76g977u-community-card img { width: 100%; height: 200px; object-fit: cover; }
.76g977u-community-card .76g977u-card-body { padding: 18px; }
.76g977u-community-card h3 { font-size: 1rem; color: var(--55a6z-text-white); margin-bottom: 8px; }
.76g977u-community-card p { font-size: 0.88rem; color: var(--55a6z-text-muted); }

/* === 响应式 === */
@media (max-width: 1024px) {
  .76g977u-video-grid { grid-template-columns: repeat(3, 1fr); }
  .76g977u-expert-grid { grid-template-columns: repeat(2, 1fr); }
  .76g977u-footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .76g977u-nav { display: none; position: absolute; top: 64px; left: 0; width: 100%; background: var(--55a6z-secondary); flex-direction: column; padding: 16px; border-bottom: 1px solid var(--55a6z-border); }
  .76g977u-nav.active { display: flex; }
  .76g977u-menu-toggle { display: block; }
  .76g977u-hero-content h1 { font-size: 1.8rem; }
  .76g977u-video-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .76g977u-feature-grid { grid-template-columns: 1fr; }
  .76g977u-ai-section { grid-template-columns: 1fr; }
  .76g977u-expert-grid { grid-template-columns: repeat(2, 1fr); }
  .76g977u-review-grid { grid-template-columns: 1fr; }
  .76g977u-howto-steps { grid-template-columns: repeat(2, 1fr); }
  .76g977u-contact-grid { grid-template-columns: 1fr; }
  .76g977u-footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .76g977u-section-title { font-size: 1.4rem; }
  .76g977u-section { padding: 40px 0; }
}
@media (max-width: 480px) {
  .76g977u-video-grid { grid-template-columns: 1fr; }
  .76g977u-expert-grid { grid-template-columns: 1fr; }
  .76g977u-howto-steps { grid-template-columns: 1fr; }
  .76g977u-hero { min-height: 400px; }
}