/* roulang page: index */
/* 基础重置与设计 Token */
    :root {
      --ocean: #0A7E8C;
      --ocean-light: #0B9BA8;
      --coral: #FF6F61;
      --deep: #0B2B36;
      --grey: #F8FAFB;
      --grey-text: #B0C4CC;
      --border-light: #E0E6EB;
      --radius-card: 24px;
      --radius-btn: 50px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      line-height: 1.6;
      background-color: var(--grey);
      color: #1e293b;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    a, button, input {
      font-family: inherit;
    }

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

    /* 自定义容器 */
    .container-custom {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    @media (min-width: 768px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }

    /* 导航毛玻璃 */
    .nav-glass {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(10, 126, 140, 0.1);
      height: 72px;
      z-index: 50;
    }

    .nav-link {
      color: #333;
      font-size: 1rem;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }

    .nav-link:hover {
      color: var(--ocean);
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--ocean);
      border-radius: 2px;
    }

    /* 汉堡菜单面板 */
    .mobile-menu {
      background: rgba(11, 43, 54, 0.95);
      backdrop-filter: blur(20px);
    }

    /* blob 动画 */
    @keyframes floatBlob {
      0% { transform: translate(0px, 0px) scale(1); }
      50% { transform: translate(30px, -20px) scale(1.02); }
      100% { transform: translate(0px, 0px) scale(1); }
    }
    .blob-bg {
      animation: floatBlob 8s ease-in-out infinite;
    }

    /* 横向滚动场景 */
    .scroll-container {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      scroll-snap-type: x mandatory;
      padding-bottom: 16px;
      -webkit-overflow-scrolling: touch;
    }
    .scroll-container::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-container::-webkit-scrollbar-thumb {
      background: var(--ocean-light);
      border-radius: 3px;
    }
    .scene-card {
      flex: 0 0 300px;
      scroll-snap-align: start;
      border-radius: 20px;
      overflow: hidden;
      background: white;
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .scene-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .scene-card:hover img {
      filter: saturate(1.2);
    }
    @media (min-width: 768px) {
      .scene-card {
        flex: 0 0 360px;
      }
    }

    /* 价格卡片推荐发光 */
    .pricing-recommend {
      border: 2px solid var(--ocean);
      box-shadow: 0 0 0 2px rgba(10,126,140,0.3);
      transform: scale(1.02);
      background: linear-gradient(145deg, #ffffff 0%, #f0fcff 100%);
    }

    /* FAQ 手风琴 */
    .faq-item {
      background: white;
      border-radius: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: background 0.2s;
    }
    .faq-item:hover {
      background: #f5fbfc;
    }
    .faq-question {
      cursor: pointer;
      padding: 20px;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      padding: 0 20px;
      color: #555;
    }
    .faq-item.open .faq-answer {
      max-height: 150px;
      padding: 0 20px 20px;
    }
    .faq-arrow {
      transition: transform 0.3s;
      font-size: 1.4rem;
      color: var(--ocean);
    }
    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

    /* 数据计数器 */
    .counter-number {
      font-variant-numeric: tabular-nums;
      font-weight: 800;
      font-size: 2.5rem;
      color: var(--ocean);
    }