/* roulang page: index */
:root {
      --primary-deep: #0B0E2D;
      --secondary-purple: #6C5CE7;
      --accent-cyan: #00E5FF;
      --bg-light: #F8FAFF;
      --card-bg: #FFFFFF;
      --text-primary: #1A1F36;
      --text-secondary: #5A6178;
      --border-light: #E8ECF4;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-sm: 0 2px 16px rgba(11, 14, 45, 0.06);
      --shadow-hover: 0 8px 32px rgba(11, 14, 45, 0.12);
      --transition-base: all 0.25s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      --sidebar-width: 220px;
      --header-mobile-height: 56px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      display: flex;
      min-height: 100vh;
      flex-direction: row;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition-base);
      font-weight: 500;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 左侧导航 App Shell */
    .app-sidebar {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--sidebar-width);
      height: 100vh;
      background-color: var(--primary-deep);
      color: white;
      display: flex;
      flex-direction: column;
      z-index: 1000;
      box-shadow: 4px 0 24px rgba(0,0,0,0.08);
      overflow-y: auto;
    }
    .sidebar-logo {
      padding: 28px 20px 20px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      margin-bottom: 16px;
    }
    .logo-text {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 2px;
      background: linear-gradient(135deg, #fff 0%, #c0d0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 28px;
      filter: drop-shadow(0 0 6px var(--accent-cyan));
    }
    .sidebar-nav {
      flex: 1;
      padding: 0 12px;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 16px;
      border-radius: 10px;
      color: rgba(255,255,255,0.7);
      font-weight: 500;
      margin-bottom: 4px;
      transition: var(--transition-base);
      font-size: 15px;
    }
    .nav-item:hover, .nav-item.active {
      background: rgba(108, 92, 231, 0.15);
      color: white;
      border-left: 3px solid var(--secondary-purple);
      padding-left: 13px;
    }
    .sidebar-footer {
      padding: 20px;
      font-size: 12px;
      color: rgba(255,255,255,0.4);
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: auto;
    }
    .main-content {
      margin-left: var(--sidebar-width);
      flex: 1;
      width: calc(100% - var(--sidebar-width));
    }

    /* 移动端导航 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-mobile-height);
      background: var(--primary-deep);
      z-index: 999;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      box-shadow: 0 2px 12px rgba(0,0,0,0.2);
    }
    .hamburger {
      color: white;
      font-size: 24px;
    }
    .mobile-drawer {
      position: fixed;
      top: 0;
      left: -280px;
      width: 260px;
      height: 100vh;
      background: var(--primary-deep);
      z-index: 1100;
      transition: left 0.3s ease;
      padding: 24px 16px;
      display: flex;
      flex-direction: column;
    }
    .mobile-drawer.open {
      left: 0;
    }
    .drawer-backdrop {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.5);
      z-index: 1050;
      display: none;
    }
    .drawer-backdrop.show {
      display: block;
    }

    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 34px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 48px;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #f0f4ff 0%, #ffffff 100%);
      padding: 80px 0;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .highlight {
      background: linear-gradient(to right, var(--secondary-purple), var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .btn-primary {
      background: var(--secondary-purple);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(108,92,231,0.4);
    }
    .btn-primary:hover {
      background: #5a4bd6;
      box-shadow: 0 6px 20px rgba(108,92,231,0.6);
      transform: translateY(-1px);
    }
    .btn-secondary {
      border: 1px solid var(--secondary-purple);
      color: var(--secondary-purple);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: rgba(108,92,231,0.06);
    }
    .btn-cta-gradient {
      background: linear-gradient(135deg, #00E5FF 0%, #6C5CE7 100%);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 8px 24px rgba(0,229,255,0.3);
    }
    .btn-cta-gradient:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(0,229,255,0.5);
    }

    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      border: 1px solid var(--border-light);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    /* 场景交替 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-text {
      flex: 1;
    }
    .scene-img {
      flex: 1;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: start;
    }
    .pricing-card {
      background: white;
      border-radius: 16px;
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      text-align: center;
    }
    .pricing-card.recommended {
      border: 2px solid var(--secondary-purple);
      transform: scale(1.02);
      box-shadow: 0 12px 32px rgba(108,92,231,0.15);
    }
    .badge {
      background: var(--secondary-purple);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    .price-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--text-primary);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    .cta-banner {
      background: linear-gradient(135deg, #6C5CE7 0%, #00E5FF 100%);
      border-radius: 24px;
      padding: 64px;
      text-align: center;
      color: white;
      margin: 40px 0;
    }

    footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    @media (max-width: 1199px) {
      .app-sidebar {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: var(--header-mobile-height);
      }
      .hero-grid, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .scene-row, .scene-row.reverse {
        flex-direction: column;
      }
      .pricing-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }