/* roulang page: index */
:root {
      --primary: #2E4B8C;
      --primary-light: #F0F3FA;
      --primary-hover: #243D73;
      --secondary: #6B7B8D;
      --success: #00A86B;
      --warning: #F5A623;
      --error: #E03E2D;
      --bg: #F5F6FA;
      --card: #FFFFFF;
      --text: #1F2329;
      --text-secondary: #86909C;
      --border-light: #E8EBF0;
      --radius-card: 12px;
      --radius-large: 16px;
      --radius-btn: 24px;
      --radius-tag: 8px;
      --shadow-default: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition: 200ms ease-out;
      --max-width: 1200px;
      --header-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo::before {
      content: "✦";
      font-size: 1.3rem;
      color: var(--primary);
      opacity: 0.8;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 8px 20px !important;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition);
    }
    .nav-cta:hover {
      background: var(--primary-hover) !important;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text);
      cursor: pointer;
    }
    /* 首屏 Hero */
    .hero {
      padding: calc(var(--header-height) + 60px) 0 80px;
      background: #FFFFFF;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      border-radius: var(--radius-large);
      overflow: hidden;
      box-shadow: var(--shadow-hover);
      background: var(--card);
      position: relative;
    }
    .hero-right img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      aspect-ratio: 4/3;
    }
    .hero-badge {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 8px 16px;
      border-radius: var(--radius-tag);
      font-weight: 600;
      font-size: 14px;
      color: var(--primary);
      box-shadow: var(--shadow-default);
    }
    h1 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text);
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--secondary);
      margin-bottom: 24px;
      line-height: 1.5;
    }
    .hero-desc {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn {
      display: inline-block;
      font-weight: 600;
      font-size: 14px;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
      cursor: pointer;
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 12px 32px;
      box-shadow: 0 4px 10px rgba(46,75,140,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 10px 28px;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }
    .text-link {
      color: var(--primary);
      font-weight: 500;
      font-size: 14px;
      transition: all var(--transition);
    }
    .text-link:hover {
      text-decoration: underline;
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text);
      line-height: 1.4;
    }
    .section-sub {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--card);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-default);
      transition: all var(--transition);
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: var(--radius-tag);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 1.5rem;
    }
    .highlight-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .highlight-card p {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.5;
    }
    /* 案例瀑布 */
    .cases-masonry {
      columns: 3 280px;
      column-gap: 24px;
    }
    .case-card {
      background: var(--card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-default);
      margin-bottom: 24px;
      break-inside: avoid;
      overflow: hidden;
      transition: all var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: #eef1f5;
    }
    .case-tags {
      padding: 20px 20px 4px;
    }
    .tag {
      display: inline-block;
      background: #F0F2F5;
      color: var(--text);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: var(--radius-tag);
      font-weight: 500;
      margin-right: 6px;
    }
    .case-content {
      padding: 12px 20px 20px;
    }
    .case-content h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .case-desc {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 12px;
    }
    /* 方案对比 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .compare-col {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-default);
      position: relative;
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .compare-col.recommended {
      box-shadow: 0 0 0 2px var(--primary), var(--shadow-default);
    }
    .badge-recommend {
      position: absolute;
      top: 12px;
      right: 12px;
      background: var(--success);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: var(--radius-tag);
      font-weight: 600;
    }
    .compare-name {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .compare-features {
      list-style: none;
      margin-bottom: 28px;
      flex: 1;
    }
    .compare-features li {
      padding: 10px 0;
      border-bottom: 1px solid var(--border-light);
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .icon-check {
      color: var(--success);
      font-weight: bold;
    }
    .icon-uncheck {
      color: #ccc;
    }
    .compare-footer {
      margin-top: auto;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 4px 0;
    }
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      text-align: left;
      font-size: 18px;
      font-weight: 600;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text);
      transition: background var(--transition);
    }
    .faq-question:hover {
      background: #FAFBFC;
      padding-left: 8px;
    }
    .faq-icon {
      font-size: 1.4rem;
      font-weight: 300;
      transition: transform 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      font-size: 16px;
      color: var(--text-secondary);
      padding-left: 8px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-light);
      text-align: center;
      padding: 64px 24px;
      border-radius: 0;
    }
    .cta-banner h2 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .cta-banner p {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 28px;
    }
    /* 页脚 */
    .footer {
      background: #FFFFFF;
      padding: 60px 0 30px;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer h4 {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .footer p, .footer a {
      color: var(--text-secondary);
      line-height: 1.8;
    }
    .footer a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-light);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      color: var(--text-secondary);
      font-size: 13px;
    }
    /* 响应式 */
    @media (max-width: 992px) {
      .hero .container {
        flex-direction: column;
      }
      .compare-table {
        grid-template-columns: 1fr;
      }
      .highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cases-masonry {
        columns: 2;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      :root {
        --header-height: 56px;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .highlights-grid {
        grid-template-columns: 1fr;
      }
      .cases-masonry {
        columns: 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 24px;
      }
      .hero {
        padding-top: calc(var(--header-height) + 40px);
      }
    }