/* roulang page: index */
:root {
      --primary: #0A2342;
      --accent: #E94E1F;
      --bg: #F5F2ED;
      --card-bg: #FFFFFF;
      --card-border: #E7E2DA;
      --text: #3A3A3A;
      --text-light: #6B6B6B;
      --white: #FFFFFF;
      --success: #1B7E4A;
      --primary-10: rgba(10, 35, 66, 0.1);
      --primary-5: rgba(10, 35, 66, 0.05);
      --shadow-sm: 0 4px 20px rgba(10, 35, 66, 0.06);
      --shadow-hover: 0 8px 30px rgba(10, 35, 66, 0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-badge: 12px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-en: "Inter", "Roboto", system-ui, sans-serif;
      --spacing-xs: 8px;
      --spacing-sm: 16px;
      --spacing-md: 24px;
      --spacing-lg: 48px;
      --spacing-xl: 80px;
      --nav-height: 72px;
    }

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

    body {
      font-family: var(--font-cn);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }

    h1, h2, h3 {
      font-weight: 600;
      color: var(--primary);
    }

    h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      color: var(--white);
    }

    h2 {
      font-size: 32px;
      line-height: 1.3;
      margin-bottom: var(--spacing-md);
      position: relative;
    }

    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
    }

    p, li {
      color: var(--text);
      font-weight: 400;
    }

    a {
      color: var(--accent);
      text-decoration: underline;
      transition: color 0.2s;
    }

    a:hover {
      color: #C03A14;
      text-decoration: none;
    }

    button, .btn {
      font-family: var(--font-cn);
      cursor: pointer;
      border: none;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-card);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      height: var(--nav-height);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      transition: color 0.2s;
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .btn-primary {
      background: var(--accent);
      color: var(--white);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(233,78,31,0.2);
    }

    .btn-primary:hover {
      background: #C03A14;
      transform: translateY(-2px);
      box-shadow: 0 8px 16px rgba(233,78,31,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      font-weight: 600;
    }

    .btn-outline:hover {
      background: var(--primary-10);
    }

    .btn-white {
      background: var(--white);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      font-weight: 700;
      box-shadow: 0 6px 16px rgba(0,0,0,0.08);
      transition: 0.2s;
    }

    .btn-white:hover {
      background: #f0f0f0;
      transform: translateY(-2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--primary);
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--nav-height);
      left: 0;
      width: 100%;
      background: var(--white);
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      z-index: 999;
    }

    .mobile-menu a {
      font-size: 18px;
      color: var(--primary);
      text-decoration: none;
      font-weight: 500;
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0A2342 0%, #C03A14 100%);
      padding: 120px 0 100px;
      margin-top: var(--nav-height);
      color: var(--white);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-title {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      margin-bottom: 20px;
      color: white;
    }

    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      color: rgba(255,255,255,0.9);
    }

    .data-cards {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .float-card {
      background: rgba(255,255,255,0.12);
      backdrop-filter: blur(8px);
      border-radius: 14px;
      padding: 20px 24px;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: 1px solid rgba(255,255,255,0.25);
    }

    .float-card .number {
      font-family: var(--font-en);
      font-size: 28px;
      font-weight: 800;
    }

    .float-card .label {
      font-size: 14px;
      opacity: 0.85;
    }

    /* 数据看板 */
    .section {
      padding: var(--spacing-xl) 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-badge {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-badge);
      padding: 28px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .stat-number {
      font-family: var(--font-en);
      font-size: 44px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-light);
      margin-top: 8px;
    }

    .trend {
      color: var(--accent);
      font-weight: 600;
      margin-top: 6px;
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 40px 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--primary-10);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
    }

    /* 对比区 */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 36px;
      border: 1px solid var(--card-border);
    }

    .compare-card.accent {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .compare-list {
      list-style: none;
      margin-top: 20px;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--card-border);
    }

    .faq-question {
      width: 100%;
      background: none;
      text-align: left;
      padding: 20px 0;
      font-size: 18px;
      font-weight: 600;
      color: var(--primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 0;
      color: var(--text);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-arrow {
      transition: transform 0.3s;
    }

    .faq-item.open .faq-arrow {
      transform: rotate(180deg);
    }

    /* 表单 */
    .contact-form {
      max-width: 640px;
      margin: 0 auto;
    }

    .form-group {
      margin-bottom: 20px;
    }

    input, textarea {
      width: 100%;
      padding: 14px 18px;
      border: 1px solid #D1CCC4;
      border-radius: var(--radius-btn);
      font-family: var(--font-cn);
      font-size: 16px;
      background: white;
      transition: 0.2s;
    }

    input:focus, textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(10,35,66,0.15);
    }

    .submit-btn {
      background: var(--accent);
      color: white;
      padding: 16px 32px;
      width: 100%;
      border-radius: var(--radius-btn);
      font-size: 18px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
      margin-top: 60px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }

    .footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }

    @media (max-width: 1024px) {
      .container { padding: 0 24px; }
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .hero-grid { grid-template-columns: 1fr; }
      .comparison-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .cards-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }