/* roulang page: index */
:root {
      --primary: #0A1F2F;
      --accent: #E85D26;
      --gray-bg: #F7F8FA;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --text-body: #4A5568;
      --text-weak: #718096;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--gray-bg);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航 */
    .nav-header {
      background: #FFFFFF;
      height: 72px;
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
      position: sticky;
      top: 0;
      z-index: 50;
    }
    .nav-logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
      margin-right: 8px;
    }
    .nav-link {
      color: var(--text-body);
      font-size: 15px;
      font-weight: 500;
      transition: color var(--transition);
      position: relative;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .search-box {
      background: #F1F3F5;
      border-radius: 20px;
      padding: 6px 16px;
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--text-weak);
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 14px;
      width: 120px;
    }
    .cta-btn {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-btn);
      padding: 10px 20px;
      font-weight: 600;
      font-size: 15px;
      transition: background var(--transition), transform 0.2s;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .cta-btn:hover {
      background: #C94A1A;
      transform: scale(1.02);
    }
    .outline-btn {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .outline-btn:hover {
      background: var(--accent);
      color: white;
    }
    /* Hero */
    .hero-section {
      background: url('/assets/images/backpic/hero-bg.jpg') center/cover no-repeat;
      min-height: 100vh;
      position: relative;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(10,31,47,0.75);
    }
    .hero-content {
      position: relative;
      z-index: 10;
      width: 100%;
    }
    .metric-card {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(16px);
      border-radius: 16px;
      padding: 16px 20px;
      color: white;
      border: 1px solid rgba(255,255,255,0.2);
    }
    /* 卡片 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      transition: all var(--transition);
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 30px rgba(0,0,0,0.08);
      border-color: var(--accent);
    }
    .service-icon {
      width: 80px;
      height: 80px;
      border-radius: 16px;
      background: #F0F2F5;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 60px;
      height: 4px;
      background: var(--accent);
      border-radius: 2px;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 30px;
      }
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color var(--transition);
    }
    .faq-question:hover {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F7F8FA;
      border-radius: 8px;
      margin-bottom: 8px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 表单 */
    .input-field {
      background: white;
      border-radius: var(--radius-btn);
      border: 1px solid #CBD5E0;
      padding: 12px 16px;
      width: 100%;
      transition: border 0.2s;
    }
    .input-field:focus {
      border-color: var(--accent);
      outline: none;
      box-shadow: 0 0 0 3px rgba(232,93,38,0.2);
    }
    .submit-btn {
      background: var(--accent);
      color: white;
      font-weight: 700;
      padding: 14px;
      border-radius: var(--radius-btn);
      width: 100%;
      transition: background var(--transition);
      border: none;
      cursor: pointer;
      font-size: 16px;
    }
    .submit-btn:hover {
      background: #C94A1A;
    }
    footer a:hover {
      color: var(--accent);
    }
    /* 移动端导航 */
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }