/* roulang page: index */
:root {
      --primary: #0F4C3A;
      --primary-dark: #0A3628;
      --secondary: #E8A838;
      --secondary-hover: #D4952A;
      --bg-light: #F6F8F5;
      --text-main: #1D1D1D;
      --text-secondary: #5C5C5C;
      --text-muted: #8E8E8E;
      --border-light: #E5E7E0;
      --white: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 8px 28px rgba(0,0,0,0.08);
      --nav-shadow: 0 2px 16px rgba(0,0,0,0.06);
      --radius-card: 16px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", "Inter", system-ui, sans-serif;
      background-color: var(--white);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航毛玻璃 */
    .nav-glass {
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: background var(--transition), box-shadow var(--transition);
    }
    .nav-scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: var(--nav-shadow);
    }

    /* 底部Tab (移动端) */
    .bottom-tab {
      background: var(--white);
      border-top: 1px solid var(--border-light);
      height: 56px;
      display: flex;
      justify-content: space-around;
      align-items: center;
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      z-index: 40;
    }
    .tab-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 10px;
      color: #999;
      transition: color var(--transition);
    }
    .tab-item.active {
      color: var(--primary);
    }
    .tab-icon {
      width: 24px;
      height: 24px;
      margin-bottom: 2px;
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      height: 56px;
      padding: 0 20px;
      background: #FAFAF8;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      transition: background var(--transition);
    }
    .faq-item.open .faq-question {
      background: var(--white);
      border: 1px solid var(--primary);
      border-bottom: none;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: var(--white);
      padding: 0 20px;
      color: #555;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
    }
    .faq-arrow {
      transition: transform 0.3s ease;
    }
    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

    /* 横向滚动隐藏滚动条 */
    .scroll-container {
      overflow-x: auto;
      scrollbar-width: none;
      -ms-overflow-style: none;
    }
    .scroll-container::-webkit-scrollbar {
      display: none;
    }

    /* 自定义阴影与过渡 */
    .card-service {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: none;
    }
    .card-service:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .card-solution {
      background: var(--white);
      border-radius: 12px;
      border: 1px solid var(--border-light);
      transition: border-color var(--transition), box-shadow var(--transition);
      min-width: 280px;
    }
    .card-solution:hover {
      border-color: var(--primary);
      box-shadow: var(--card-shadow);
    }
    .case-card img {
      transition: transform 0.4s ease;
    }
    .case-card:hover img {
      transform: scale(1.03);
    }

    .btn-primary {
      background: var(--secondary);
      color: var(--white);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: filter 0.2s, transform 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      filter: brightness(0.9);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: background 0.2s, color 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(232,168,56,0.1);
    }
    .btn-white {
      background: var(--white);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: filter 0.2s;
    }
    .btn-white:hover {
      filter: brightness(0.95);
    }

    .data-number {
      font-size: 3rem;
      line-height: 1;
      font-weight: 800;
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
      .data-number {
        font-size: 2.5rem;
      }
    }