/* roulang page: index */
:root {
      --primary-deep: #1E2A4F;
      --primary-mid: #3F51B5;
      --accent-gold: #D49B3F;
      --accent-gold-dark: #C58C2E;
      --bg-warm: #FAF9F7;
      --bg-light: #F3F2EF;
      --card-white: #FFFFFF;
      --text-dark: #1A1D26;
      --text-muted: #6B7280;
      --success-green: #059669;
      --error-red: #DC2626;
      --border-light: #E5E7EB;
      --shadow-xs: 0 2px 8px rgba(30,42,79,0.04);
      --shadow-sm: 0 4px 16px rgba(30,42,79,0.06);
      --shadow-md: 0 8px 24px rgba(30,42,79,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --font-sans: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', '苹方', '雅黑', sans-serif;
      --transition: 200ms ease-in-out;
      --container-max: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 32px;
    }

    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      transition: box-shadow var(--transition);
      box-shadow: 0 1px 4px rgba(30,42,79,0.06);
    }

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

    .logo {
      font-weight: 700;
      font-size: 24px;
      color: var(--primary-deep);
      letter-spacing: 1px;
    }

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

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-dark);
      transition: color var(--transition);
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-deep);
      font-weight: 600;
    }

    .nav-cta {
      background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-gold-dark) 100%);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition);
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .nav-cta:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }

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

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      border-radius: 2px;
      transition: var(--transition);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .navbar {
        height: 64px;
      }
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--bg-warm);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 200;
      transform: translateX(100%);
      transition: transform 300ms ease-in-out;
    }

    .mobile-menu.open {
      transform: translateX(0);
    }

    .mobile-menu a {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary-deep);
    }

    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      background: none;
      border: none;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-color: var(--bg-warm);
      position: relative;
      overflow: hidden;
      padding: 80px 0;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }

    .hero-content {
      flex: 1 1 50%;
      z-index: 2;
    }

    .hero-visual {
      flex: 1 1 40%;
      position: relative;
      min-height: 300px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 28px;
      line-height: 1.6;
    }

    .hero-cta {
      background: var(--primary-deep);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 17px;
      border: none;
      cursor: pointer;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
    }

    .hero-cta:hover {
      background: #2A3760;
      transform: scale(1.02);
    }

    .metrics-mini {
      display: flex;
      gap: 32px;
      margin-top: 32px;
    }

    .metric-item {
      text-align: left;
    }

    .metric-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary-mid);
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 36px;
      }
      .metrics-mini {
        justify-content: center;
      }
      .hero-visual {
        min-height: 200px;
      }
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--primary-deep);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    /* 指标看板 */
    #metrics {
      background: var(--bg-light);
    }

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

    .metric-card {
      background: var(--card-white);
      border-radius: 16px;
      padding: 32px;
      box-shadow: var(--shadow-xs);
      transition: all 250ms ease;
    }

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

    .metric-big {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary-mid);
    }

    .metric-trend {
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    @media (max-width: 1024px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 520px) {
      .metrics-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-xs);
      transition: all 250ms ease;
      text-align: left;
    }

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

    .service-icon {
      width: 56px;
      height: 56px;
      background: rgba(63,81,181,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary-mid);
      font-size: 28px;
    }

    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 520px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比 */
    .comparison-row {
      display: flex;
      gap: 24px;
      align-items: stretch;
    }

    .compare-card {
      flex: 1;
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-xs);
    }

    .compare-card.traditional {
      background: #f9fafb;
    }

    .compare-card.qiuhui {
      border-left: 4px solid var(--accent-gold);
    }

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

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
      font-size: 15px;
    }

    @media (max-width: 768px) {
      .comparison-row {
        flex-direction: column;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      padding: 20px 24px;
      box-shadow: var(--shadow-xs);
      transition: all var(--transition);
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 300ms ease-in-out;
      color: var(--text-muted);
      font-size: 16px;
      margin-top: 0;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* 表单 */
    .contact-card {
      max-width: 560px;
      margin: 0 auto;
      background: var(--card-white);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      font-size: 14px;
      color: var(--text-muted);
      display: block;
      margin-bottom: 6px;
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      height: 48px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      padding: 0 16px;
      font-size: 16px;
      transition: border var(--transition), box-shadow var(--transition);
    }

    .form-group textarea {
      height: 100px;
      padding: 12px;
    }

    .form-group input:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: var(--primary-mid);
      box-shadow: 0 0 0 3px rgba(63,81,181,0.1);
    }

    .btn-submit {
      width: 100%;
      background: var(--primary-deep);
      color: white;
      border: none;
      height: 50px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 17px;
      cursor: pointer;
      transition: background var(--transition);
    }

    .btn-submit:hover {
      background: #2A3760;
    }

    /* 页脚 */
    footer {
      background: var(--primary-deep);
      color: #CBD5E1;
      padding: 40px 0;
    }

    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    @media (max-width: 600px) {
      .footer-content {
        flex-direction: column;
        text-align: center;
      }
    }

    /* 视觉图形 */
    .hero-graphic {
      position: relative;
      width: 100%;
      height: 100%;
    }