/* roulang page: index */
:root {
      --deep-navy: #0B2B3B;
      --teal-vivid: #00C4A7;
      --coral-warm: #FF6B4A;
      --coral-deep: #E55A3A;
      --bg-light: #F7FAFC;
      --card-white: #FFFFFF;
      --text-dark: #1A202C;
      --text-muted: #718096;
      --text-soft: #94A3B8;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
      --transition: 0.25s ease;
      --font-heading: 'Inter', 'Noto Sans SC', '思源黑体', system-ui, -apple-system, sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', '思源黑体', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    h1, h2, h3, h4, h5, h6 {
      font-family: var(--font-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;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

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

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: 56px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--deep-navy);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      color: var(--teal-vivid);
      font-size: 24px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-size: 14px;
      font-weight: 500;
      color: #4A5568;
    }

    .nav-links a {
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: all var(--transition);
    }

    .nav-links a:hover {
      color: var(--teal-vivid);
      border-bottom-color: var(--teal-vivid);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon {
      font-size: 18px;
      color: #4A5568;
      cursor: pointer;
      transition: color var(--transition);
    }

    .search-icon:hover {
      color: var(--teal-vivid);
    }

    .btn-primary-sm {
      background: var(--coral-warm);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 0 20px;
      height: 40px;
      font-weight: 600;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: background var(--transition), transform 0.2s;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-primary-sm:hover {
      background: var(--coral-deep);
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      font-size: 24px;
      color: var(--deep-navy);
      background: none;
      border: none;
      cursor: pointer;
    }

    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-icon, .nav-actions .btn-primary-sm {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-menu-open .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 56px;
        left: 0;
        width: 100%;
        background: white;
        padding: 20px;
        box-shadow: var(--shadow-md);
        gap: 16px;
        border-bottom: 1px solid var(--border-light);
      }
    }

    /* Hero */
    .hero-section {
      display: flex;
      align-items: center;
      min-height: 85vh;
      background: linear-gradient(90deg, #ffffff 0%, #F7FAFC 100%);
    }

    .hero-grid {
      display: flex;
      width: 100%;
      gap: 40px;
    }

    .hero-left {
      flex: 0 0 40%;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .hero-right {
      flex: 0 0 60%;
      border-radius: var(--radius-img);
      overflow: hidden;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 500px;
    }

    .hero-right::after {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(11,43,59,0.1) 0%, rgba(0,196,167,0.08) 100%);
    }

    .hero-title {
      font-size: 44px;
      font-weight: 800;
      color: var(--deep-navy);
      margin-bottom: 20px;
      line-height: 1.2;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--coral-warm);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 700;
      font-size: 16px;
      transition: background var(--transition), transform 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--coral-deep);
      transform: scale(1.02);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--teal-vivid);
      color: var(--teal-vivid);
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 700;
      font-size: 16px;
      transition: all var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: var(--teal-vivid);
      color: white;
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
      .hero-right {
        min-height: 300px;
        order: -1;
      }
      .hero-title {
        font-size: 32px;
      }
    }

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

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--deep-navy);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-desc {
      font-size: 18px;
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 48px;
    }

    /* 价值主张 非对称 */
    .value-grid {
      display: flex;
      gap: 24px;
      align-items: stretch;
    }
    .value-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      flex: 1;
    }
    .value-card.main {
      flex: 1.3;
      background: #F0FDFA;
      border-left: 6px solid var(--teal-vivid);
    }
    .value-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .value-icon {
      font-size: 32px;
      color: var(--teal-vivid);
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .value-grid {
        flex-direction: column;
      }
    }

    /* 功能分组 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text {
      flex: 1;
    }
    .feature-img {
      flex: 1;
      border-radius: var(--radius-img);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
    }

    /* 场景卡 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: white;
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .scenario-card:nth-child(2) {
      border-top: 4px solid var(--teal-vivid);
    }
    @media (max-width: 768px) {
      .scenario-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 20px;
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 价格卡 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      position: relative;
    }
    .pricing-card.popular {
      border: 2px solid var(--teal-vivid);
      transform: scale(1.03);
    }
    .badge {
      background: var(--coral-warm);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 12px;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
      .pricing-card.popular {
        transform: none;
      }
    }

    /* FAQ */
    .faq-item {
      background: #F7FAFC;
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 页脚CTA */
    .cta-dark {
      background: var(--deep-navy);
      padding: 80px 0;
      text-align: center;
    }

    /* Footer */
    .footer {
      background: var(--deep-navy);
      color: #94A3B8;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }