/* roulang page: index */
:root {
      --primary: #1A3C6D;
      --primary-hover: #15325A;
      --accent: #0F766E;
      --accent-light: rgba(15, 118, 110, 0.08);
      --bg: #F8FAFC;
      --surface: #FFFFFF;
      --text-main: #1E293B;
      --text-soft: #64748B;
      --text-light: #475569;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 30px;
      --space-section: 88px;
      --max-width: 1200px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-main);
      margin: 0;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 卡片化导航面板 */
    .nav-card {
      background: var(--surface);
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
      margin-top: 16px;
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .logo-text {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }

    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .nav-links a i {
      font-size: 0.9rem;
      color: var(--accent);
    }

    .nav-links a:hover {
      color: var(--accent);
      border-bottom: 2px solid var(--accent);
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      color: white;
    }

    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--primary);
      cursor: pointer;
    }

    /* 板块通用 */
    section {
      padding: var(--space-section) 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2rem;
      color: var(--text-main);
      margin-bottom: 0.5rem;
      letter-spacing: -0.3px;
    }

    .section-sub {
      color: var(--text-soft);
      font-size: 1.1rem;
      margin-bottom: 3rem;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: background 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
      box-shadow: 0 2px 4px rgba(0,0,0,0.04);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent);
      color: var(--accent);
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: background 0.2s, transform 0.2s;
    }

    .btn-outline:hover {
      background: var(--accent-light);
      transform: translateY(-2px);
    }

    /* 卡片 */
    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      transition: box-shadow 0.25s ease, transform 0.25s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

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

    .icon-circle {
      width: 48px;
      height: 48px;
      background: var(--accent-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--accent);
      font-size: 1.4rem;
    }

    /* 场景图文 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 64px;
    }

    .scenario-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .scenario-text {
      flex: 1;
    }

    .badge {
      background: var(--accent-light);
      color: var(--accent);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 案例卡片 */
    .case-card {
      background: #F1F5F9;
      border-radius: var(--radius-card);
      padding: 24px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
    }

    /* 价格卡片 */
    .pricing-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 32px 24px;
      text-align: center;
      border: 2px solid transparent;
      transition: all 0.25s;
    }

    .pricing-card.featured {
      border-color: var(--accent);
      position: relative;
    }

    .popular-badge {
      background: var(--accent);
      color: white;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }

    .price {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary);
    }

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

    .faq-question {
      font-weight: 600;
      padding: 16px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFC;
      padding: 0 16px;
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      border-radius: 20px;
      padding: 56px 32px;
      text-align: center;
      color: white;
    }

    .footer-dark {
      background: #1E293B;
      color: #CBD5E1;
      padding: 48px 0 24px;
    }

    @media (max-width: 1024px) {
      .scenario-row {
        flex-direction: column;
      }
      .nav-links {
        gap: 1.2rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        margin-top: 16px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-card {
        flex-wrap: wrap;
      }
      .scenario-row {
        gap: 24px;
      }
    }