/* roulang page: index */
:root {
      --primary-deep: #0A2540;
      --accent-orange: #FF6B35;
      --bg-light: #F8F9FC;
      --white: #FFFFFF;
      --text-main: #4A5568;
      --text-light: #718096;
      --border-light: #E2E8F0;
      --card-shadow: 0 4px 20px rgba(10, 37, 64, 0.08);
      --radius-lg: 12px;
      --radius-pill: 20px;
      --radius-btn: 8px;
      --font-h1: 48px/56px;
      --font-h2: 36px/44px;
      --font-h3: 24px/32px;
      --font-body: 16px/28px;
      --spacing-section: 100px;
      --max-width: 1200px;
      --transition: 0.25s ease;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航栏 - 分段标签样式 */
    .site-header {
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 12px 0;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--primary-deep);
      white-space: nowrap;
    }
    .logo span {
      color: var(--accent-orange);
    }

    .nav-chips {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .nav-chip {
      display: inline-block;
      padding: 8px 18px;
      border-radius: var(--radius-pill);
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      background: transparent;
      transition: background 0.2s, color 0.2s;
    }

    .nav-chip:hover {
      background: #E8F0FE;
      color: var(--primary-deep);
    }

    .nav-chip.active {
      background: var(--primary-deep);
      color: white;
    }

    .header-cta {
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: all 0.2s;
      white-space: nowrap;
      box-shadow: 0 4px 12px rgba(255,107,53,0.25);
    }
    .header-cta:hover {
      background: #E55A2B;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255,107,53,0.35);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary-deep);
      padding: 4px;
    }

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

    /* Hero */
    .hero {
      background-color: var(--white);
      background-image: radial-gradient(circle at 20% 30%, rgba(10,37,64,0.02) 0%, transparent 40%);
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: var(--font-h1);
      font-weight: 700;
      color: var(--primary-deep);
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero-content h1 .highlight {
      color: var(--accent-orange);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: 0.25s;
      box-shadow: 0 6px 18px rgba(255,107,53,0.28);
    }
    .btn-primary:hover {
      background: #E55A2B;
      transform: translateY(-2px);
      box-shadow: 0 10px 28px rgba(255,107,53,0.38);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary-deep);
      color: white;
    }
    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 20px 35px rgba(10,37,64,0.12);
      width: 100%;
    }

    /* 核心优势 - 非对称栅格 */
    .features-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 32px;
    }
    .feature-large {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--card-shadow);
      border-left: 4px solid var(--accent-orange);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .feature-icon {
      font-size: 36px;
      color: var(--accent-orange);
      margin-bottom: 16px;
    }
    .feature-large h3 {
      font-size: var(--font-h3);
      color: var(--primary-deep);
      margin-bottom: 12px;
    }
    .small-cards {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .feature-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--card-shadow);
    }
    .feature-card .icon {
      font-size: 28px;
      color: var(--accent-orange);
      margin-bottom: 10px;
    }

    /* 场景卡片 */
    .scenario-card {
      display: flex;
      background: white;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      margin-bottom: 48px;
    }
    .scenario-card.reverse {
      flex-direction: row-reverse;
    }
    .scenario-img {
      flex: 1;
      min-height: 280px;
      background-size: cover;
      background-position: center;
    }
    .scenario-text {
      flex: 1;
      padding: 48px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .scenario-text h3 {
      font-size: var(--font-h3);
      color: var(--primary-deep);
      margin-bottom: 16px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: #EDF2F7;
      border-radius: var(--radius-lg);
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .case-metric {
      font-size: 28px;
      font-weight: 700;
      color: var(--accent-orange);
    }

    /* 定价 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      box-shadow: var(--card-shadow);
      text-align: center;
    }
    .pricing-card.featured {
      border: 2px solid var(--accent-orange);
      box-shadow: 0 14px 28px rgba(255,107,53,0.18);
      transform: scale(1.02);
    }

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: white;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px;
      font-weight: 600;
      font-size: 16px;
      text-align: left;
      display: flex;
      justify-content: space-between;
      color: var(--primary-deep);
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-main);
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-question {
      background: #F8F9FC;
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(105deg, #F0F4FF 0%, #FFF3EF 100%);
      text-align: center;
      border-radius: 20px;
      padding: 64px 32px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--primary-deep);
      color: #CBD5E0;
      padding: 60px 0 28px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .features-grid, .cases-grid, .pricing-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .scenario-card {
        flex-direction: column;
      }
      .scenario-card.reverse {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      :root {
        --font-h1: 32px/40px;
        --font-h2: 28px/36px;
        --font-h3: 20px/28px;
      }
      .nav-chips, .header-cta {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-nav.open {
        display: flex;
        flex-direction: column;
        width: 100%;
        background: white;
        padding: 16px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }