/* roulang page: index */
:root {
      --primary: #4E6EF2;
      --primary-dark: #3D5AFE;
      --primary-light: #E8EBFF;
      --success: #00B578;
      --warning: #FF9F0A;
      --danger: #FA5151;
      --text-main: #1F2329;
      --text-secondary: #86909C;
      --border-light: #E5E8EF;
      --bg-page: #F5F6FA;
      --bg-card: #FFFFFF;
      --bg-hero-right: #F0F2FF;
      --radius-xl: 16px;
      --radius-lg: 12px;
      --radius-btn: 24px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04), 0 0 0 1px rgba(0,0,0,0.02);
      --shadow-hover: 0 8px 24px rgba(78,110,242,0.15);
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-family);
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      border: none;
      background: none;
      font-family: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    #nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--bg-card);
      height: 64px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 16px;
      font-weight: 700;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      color: var(--text-secondary);
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -2px;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--bg-card);
      border-radius: 40px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
      padding: 8px 20px;
      z-index: 200;
      gap: 16px;
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      color: var(--text-secondary);
      gap: 2px;
      padding: 4px 8px;
      border-radius: 20px;
      transition: color 0.2s, background 0.2s;
    }

    .mobile-nav a i {
      font-size: 18px;
    }

    .mobile-nav a.active {
      color: var(--primary);
      background: var(--primary-light);
    }

    /* Hero */
    #hero {
      background: linear-gradient(90deg, #FFFFFF 55%, var(--bg-hero-right) 55%);
      padding: 60px 0;
      display: flex;
      align-items: center;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      align-items: center;
      gap: 40px;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .hero-left h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 24px;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(78,110,242,0.3);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-primary:hover {
      background: #3A54D4;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(78,110,242,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }

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

    .hero-badges {
      display: flex;
      gap: 24px;
      font-size: 14px;
      color: var(--text-secondary);
      flex-wrap: wrap;
    }

    .hero-badges span strong {
      color: var(--primary);
      font-size: 20px;
      margin-right: 2px;
    }

    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
    }

    .hero-right img {
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-card);
      width: 100%;
      aspect-ratio: 4/3;
      object-fit: cover;
    }

    .floating-card {
      position: absolute;
      bottom: -20px;
      right: -10px;
      background: white;
      border-radius: 12px;
      padding: 12px 16px;
      box-shadow: var(--shadow-hover);
      font-weight: 600;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }

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

    .section-title {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 12px;
      text-align: center;
    }

    .section-sub {
      font-size: 16px;
      color: var(--text-secondary);
      text-align: center;
      margin-bottom: 48px;
    }

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

    .highlight-card {
      background: var(--bg-card);
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }

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

    .highlight-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .highlight-card h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }

    .highlight-desc {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    .badge-success {
      background: #E6F9F0;
      color: var(--success);
      font-weight: 600;
      font-size: 14px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
    }

    /* 案例瀑布 */
    .cases-masonry {
      columns: 2;
      column-gap: 24px;
    }

    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 24px;
      break-inside: avoid;
      transition: 0.25s;
    }

    .case-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }

    .case-card img {
      width: 100%;
      height: auto;
      display: block;
    }

    .case-content {
      padding: 20px;
    }

    .case-tag {
      background: #F0F2FF;
      color: var(--primary);
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 12px;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 方案对比 */
    .compare-table {
      background: var(--bg-card);
      border-radius: var(--radius-xl);
      padding: 24px;
      box-shadow: var(--shadow-card);
      overflow-x: auto;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 600px;
    }

    th, td {
      padding: 16px 20px;
      text-align: center;
    }

    th {
      background: #F9FAFF;
      font-weight: 600;
    }

    .highlight-col {
      background: #F0F2FF;
      border-radius: 12px 12px 0 0;
      position: relative;
    }

    .popular-tag {
      background: var(--warning);
      color: white;
      font-size: 12px;
      padding: 2px 12px;
      border-radius: 20px;
      position: absolute;
      top: -10px;
      right: 10px;
    }

    .fa-check-circle {
      color: var(--success);
    }
    .fa-times-circle {
      color: var(--danger);
    }
    .fa-minus-circle {
      color: var(--text-secondary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      display: flex;
      gap: 16px;
      align-items: flex-start;
      padding: 16px 0;
    }

    .faq-number {
      background: var(--primary-light);
      color: var(--primary);
      width: 36px;
      height: 36px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    .faq-content {
      flex: 1;
    }

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

    .faq-answer {
      font-size: 15px;
      color: var(--text-secondary);
      margin-top: 8px;
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, #4E6EF2, #00B578);
      text-align: center;
      padding: 80px 20px;
      color: white;
    }

    #cta h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      padding: 14px 40px;
      border-radius: 30px;
      font-weight: 700;
      margin-top: 24px;
      display: inline-block;
    }

    .trust-icons {
      margin-top: 32px;
      display: flex;
      gap: 32px;
      justify-content: center;
      color: rgba(255,255,255,0.7);
    }

    /* 页脚 */
    footer {
      background: #1F2329;
      color: #86909C;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: white;
    }

    footer a:hover {
      color: white;
    }

    .copyright {
      border-top: 1px solid #2E3238;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-nav { display: flex; }
      #hero {
        background: white;
        padding: 32px 0;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-right { order: -1; }
      .highlights-grid {
        grid-template-columns: 1fr 1fr;
      }
      .cases-masonry {
        columns: 1;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

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