/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #F59E0B;
      --accent-hover: #D97706;
      --bg-light: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-main: #334155;
      --text-heading: #0F172A;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --success: #10B981;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-hover: 0 4px 12px rgba(0,0,0,0.08);
      --transition: 200ms ease;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-heading);
      color: var(--text-heading);
      font-weight: 700;
      line-height: 1.3;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .glass-nav {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.5);
      transition: background var(--transition), box-shadow var(--transition);
    }
    .glass-nav.scrolled {
      background: rgba(255, 255, 255, 0.95);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .nav-link {
      position: relative;
      font-size: 14px;
      color: var(--text-main);
      padding: 8px 0;
      transition: color var(--transition);
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    /* 搜索框 */
    .search-box {
      width: 0;
      opacity: 0;
      transition: width 0.25s ease, opacity 0.2s ease;
      overflow: hidden;
    }
    .search-box.active {
      width: 200px;
      opacity: 1;
    }
    /* 按钮 */
    .btn-primary {
      background-color: var(--accent);
      color: #fff;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 2px 6px rgba(245, 158, 11, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(245, 158, 11, 0.4);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), color var(--transition), transform var(--transition);
    }
    .btn-secondary:hover {
      background: rgba(15, 23, 42, 0.05);
      transform: translateY(-1px);
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 28px;
      transition: box-shadow var(--transition), transform var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .accent-badge {
      background: var(--accent);
      color: #fff;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-block;
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-heading);
      transition: color var(--transition);
    }
    .faq-question:hover {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-icon {
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 案例数字 */
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.2;
    }
    /* 背景图叠加 */
    .hero-bg {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    .cta-bg {
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
    }
    /* 移动端菜单 */
    @media (max-width: 768px) {
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        padding: 16px 0;
      }
      .mobile-menu.open {
        display: flex;
      }
    }