/* roulang page: index */
:root {
      --primary-deep: #1E1E24;
      --accent-cyan: #00C2BA;
      --warm-bg: #FAFAF8;
      --amber-orange: #F5921E;
      --white: #ffffff;
      --gray-light: #E6E6E6;
      --text-main: #1E1E24;
      --text-secondary: #5A5A64;
      --text-muted: #8C8C94;
      --border-light: #E6E6E6;
      --radius-card: 12px;
      --radius-btn: 6px;
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.06);
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-sans);
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; transition: var(--transition); }
    img { max-width: 100%; height: auto; display: block; }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航系统 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--white);
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.3s;
    }
    .header-shadow {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .nav-brand {
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.02em;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-brand i {
      color: var(--accent-cyan);
      font-size: 2rem;
    }
    .top-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 0;
    }
    .search-cta-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-icon {
      font-size: 1.3rem;
      color: var(--text-secondary);
      cursor: pointer;
      transition: var(--transition);
    }
    .search-icon:hover { color: var(--accent-cyan); }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--white);
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      display: inline-block;
      cursor: pointer;
      font-size: 0.95rem;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
      color: white;
    }
    .channel-tabs-row {
      display: flex;
      align-items: center;
      gap: 8px;
      padding-bottom: 12px;
      overflow-x: auto;
      white-space: nowrap;
      scrollbar-width: thin;
      -ms-overflow-style: none;
    }
    .channel-tabs-row::-webkit-scrollbar { height: 4px; background: #f0f0f0; }
    .channel-tabs-row::-webkit-scrollbar-thumb { background: #c0c0c0; border-radius: 4px; }
    .pill-tab {
      background: #f0f0f0;
      color: var(--text-secondary);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      transition: var(--transition);
      display: inline-block;
    }
    .pill-tab.active, .pill-tab:hover {
      background: var(--accent-cyan);
      color: var(--white);
    }
    /* 汉堡菜单隐藏桌面 */
    .hamburger { display: none; background: none; border: none; font-size: 1.8rem; color: var(--primary-deep); cursor: pointer; }
    @media (max-width: 640px) {
      .channel-tabs-row { margin-top: 4px; }
      .top-row { flex-wrap: wrap; }
      .hamburger { display: block; }
      .desktop-cta { display: none; }
      .mobile-menu-panel {
        display: none;
        flex-direction: column;
        background: white;
        padding: 12px 0;
        border-top: 1px solid var(--border-light);
      }
      .mobile-menu-panel.open { display: flex; }
      .pill-tab.mobile { display: block; text-align: center; margin: 4px 0; }
    }
    @media (min-width: 641px) {
      .mobile-menu-panel { display: none; }
      .mobile-cta { display: none; }
    }
    /* Hero 双栏 */
    .hero-section {
      background: var(--primary-deep);
      padding: 60px 0;
      color: white;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-left { flex: 1 1 55%; }
    .hero-right { flex: 1 1 35%; }
    .hero-title {
      font-size: clamp(2.4rem, 5vw, 3.3rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.75);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 36px;
    }
    .btn-outline-white {
      background: transparent;
      border: 2px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-white:hover {
      background: rgba(0,194,186,0.15);
      color: white;
    }
    .trust-icons {
      display: flex;
      gap: 28px;
      align-items: center;
      color: rgba(255,255,255,0.5);
      font-size: 0.9rem;
      flex-wrap: wrap;
    }
    .hero-image {
      border-radius: 16px;
      overflow: hidden;
      box-shadow: 12px 12px 0 rgba(0,194,186,0.15);
      transition: var(--transition);
    }
    .hero-image img { width: 100%; object-fit: cover; }
    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: clamp(2rem, 4vw, 2.5rem);
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.02em;
      color: var(--primary-deep);
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .highlight-item {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .highlight-icon {
      font-size: 2.2rem;
      color: var(--accent-cyan);
    }
    .highlight-item h3 {
      font-size: 1.3rem;
      font-weight: 600;
    }
    /* 瀑布流卡片 */
    .masonry-grid {
      columns: 3;
      column-gap: 24px;
    }
    .masonry-card {
      break-inside: avoid;
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 24px;
      transition: var(--transition);
    }
    .masonry-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    .masonry-card img {
      width: 100%;
      transition: transform 0.3s;
    }
    .masonry-card:hover img { transform: scale(1.03); }
    .card-text {
      padding: 20px;
    }
    .card-text h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .tag {
      background: #f0f0f0;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      color: var(--text-secondary);
      display: inline-block;
      margin-top: 12px;
    }
    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .compare-col {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 20px;
      border: 1px solid var(--border-light);
      text-align: center;
    }
    .col-highlight {
      background: #e0faf9;
    }
    .col-dark {
      background: var(--primary-deep);
      color: white;
    }
    .compare-col h3 { font-size: 1.6rem; margin-bottom: 20px; }
    .feature-list { list-style: none; text-align: left; margin: 20px 0; }
    .feature-list li { padding: 10px 0; border-bottom: 1px solid #eee; display: flex; align-items: center; gap: 8px; }
    .fa-check { color: var(--accent-cyan); }
    .fa-times { color: #ccc; }
    /* 数据区 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: 8px;
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .accordion-title {
      padding: 16px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      transition: 0.2s;
    }
    .accordion-title:hover {
      border-left: 4px solid var(--accent-cyan);
      padding-left: 20px;
    }
    .accordion-content {
      padding: 0 24px 20px;
      background: #f9f9f9;
      display: none;
    }
    .accordion-item.active .accordion-content { display: block; }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-deep);
      padding: 70px 0;
      text-align: center;
      color: white;
    }
    .btn-amber {
      background: var(--amber-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      transition: var(--transition);
    }
    .btn-amber:hover { filter: brightness(1.1); transform: scale(1.03); }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      padding: 50px 0 30px;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-light);
      padding-top: 20px;
      text-align: center;
      color: var(--text-muted);
    }
    @media (max-width: 1024px) {
      .masonry-grid { columns: 2; }
      .compare-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 640px) {
      .hero-grid { flex-direction: column; }
      .highlight-grid { grid-template-columns: 1fr 1fr; }
      .masonry-grid { columns: 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .stats-grid { flex-direction: column; }
    }