/* roulang page: index */
:root {
      --primary-gray: #2C2C2C;
      --signal-cyan: #00E5A0;
      --signal-cyan-hover: #00C78A;
      --bg-light: #FAFAFA;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-body: #333333;
      --text-muted: #666666;
      --text-light: #888888;
      --border-light: #E8E8E8;
      --border-input: #DDDDDD;
      --shadow-card: 0 8px 24px rgba(0,0,0,0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition-smooth: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      margin: 0;
      font-weight: 600;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

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

    .grid-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--white);
      height: 72px;
      border-bottom: 1px solid var(--border-light);
      display: flex;
      align-items: center;
      padding: 0 20px;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-dark);
      font-weight: 700;
      font-size: 20px;
      letter-spacing: 1px;
    }

    .logo-icon {
      height: 32px;
      width: 40px;
      position: relative;
      display: flex;
      align-items: center;
    }

    .logo-icon::before {
      content: "";
      display: block;
      width: 36px;
      height: 18px;
      border-top: 3px solid var(--text-dark);
      border-bottom: 3px solid var(--text-dark);
      position: relative;
    }

    .logo-icon::after {
      content: "";
      position: absolute;
      left: 8px;
      top: 50%;
      transform: translateY(-50%);
      width: 14px;
      height: 2px;
      background: var(--signal-cyan);
      box-shadow: 0 -5px 0 var(--signal-cyan), 0 5px 0 var(--signal-cyan);
    }

    .desktop-nav {
      display: flex;
      gap: 40px;
      align-items: center;
    }

    .desktop-nav a {
      font-size: 15px;
      font-weight: 500;
      color: #555;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }

    .desktop-nav a:hover,
    .desktop-nav a.active {
      color: var(--text-dark);
      border-bottom-color: var(--signal-cyan);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      color: #888;
      font-size: 20px;
      cursor: default;
    }

    .btn-primary {
      background: var(--signal-cyan);
      color: var(--text-dark);
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--signal-cyan-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-gray);
      color: var(--primary-gray);
      font-weight: 600;
      font-size: 16px;
      border-radius: var(--radius-btn);
      padding: 12px 30px;
      transition: 0.2s;
      display: inline-block;
    }

    .btn-outline:hover {
      background: var(--primary-gray);
      color: white;
    }

    .btn-outline-white {
      border-color: rgba(255,255,255,0.9);
      color: white;
    }

    .btn-outline-white:hover {
      background: white;
      color: var(--primary-gray);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--text-dark);
    }

    /* Hero */
    .hero-section {
      background: linear-gradient(160deg, #1E1E1E 0%, #2C2C2C 100%);
      min-height: 620px;
      display: flex;
      align-items: center;
      padding: 0 20px;
      position: relative;
      overflow: hidden;
    }

    .hero-watermark {
      position: absolute;
      right: 5%;
      bottom: 0;
      font-size: 200px;
      font-weight: 900;
      color: rgba(255,255,255,0.03);
      pointer-events: none;
      line-height: 1;
    }

    .hero-content h1 {
      font-size: 56px;
      line-height: 1.15;
      font-weight: 700;
      color: white;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
    }

    .hero-tag {
      color: var(--signal-cyan);
      font-size: 12px;
      letter-spacing: 0.15em;
      margin-bottom: 16px;
      text-transform: uppercase;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.75);
      max-width: 520px;
      margin-bottom: 32px;
    }

    .decor-lines {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .line {
      height: 2px;
      background: rgba(255,255,255,0.15);
    }

    /* 区块通用 */
    .section {
      padding: 120px 0;
    }
    .section-stats {
      padding: 80px 0 120px;
    }
    .section-title {
      font-size: 40px;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 12px;
    }
    .section-sub {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 48px;
    }

    /* 卡片 */
    .stat-card, .service-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 20px;
      transition: all var(--transition-smooth);
    }
    .stat-card:hover, .service-card:hover {
      box-shadow: var(--shadow-card);
      border-color: var(--signal-cyan);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--signal-cyan);
      font-feature-settings: "tnum";
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--signal-cyan);
      mask-size: contain;
      margin-bottom: 20px;
    }

    /* 对比表 */
    .compare-table {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
    }
    .table-row {
      display: flex;
      border-bottom: 1px solid #EEEEEE;
    }
    .table-cell {
      flex: 1;
      padding: 18px 15px;
      font-size: 15px;
    }
    .pro-bg {
      background: #F5FFFB;
    }
    .recommend-badge {
      background: var(--signal-cyan);
      color: #1A1A1A;
      font-size: 12px;
      padding: 2px 8px;
      border-radius: 20px;
      margin-left: 6px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #eee;
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 500;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.25s ease;
      color: #555;
    }

    /* 表单 */
    .input-field {
      width: 100%;
      padding: 12px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      margin-bottom: 16px;
      transition: 0.2s;
    }
    .input-field:focus {
      border-color: var(--signal-cyan);
      box-shadow: 0 0 0 3px rgba(0,229,160,0.15);
      outline: none;
    }

    footer {
      background: white;
      border-top: 1px solid #eee;
      padding: 60px 0 0;
    }
    .footer-bottom {
      border-top: 1px solid #eee;
      padding: 16px 0;
      text-align: center;
      color: #999;
      font-size: 13px;
      margin-top: 40px;
    }

    @media (max-width: 640px) {
      .desktop-nav, .header-actions .search-icon {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .hero-content h1 {
        font-size: 36px;
      }
      .hero-watermark {
        font-size: 120px;
      }
      .section-title {
        font-size: 28px;
      }
      .stat-number {
        font-size: 32px;
      }
      .table-row {
        flex-direction: column;
        border-bottom: 2px solid #ddd;
      }
      .table-cell {
        text-align: left;
      }
    }

    .mobile-menu {
      display: none;
      position: absolute;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 20px;
      box-shadow: 0 10px 15px rgba(0,0,0,0.05);
    }
    .mobile-menu.open {
      display: flex;
    }