/* roulang page: index */
:root {
      --primary: #1A56DB;
      --primary-dark: #0F3B75;
      --accent: #E8A838;
      --accent-dark: #C88A20;
      --bg-warm: #F9F6F0;
      --bg-card: #FFFFFF;
      --bg-footer: #F0EDE6;
      --text-main: #1e2b3c;
      --text-muted: #5f6b7a;
      --border-light: rgba(15, 59, 117, 0.08);
      --shadow-card: 0 4px 20px rgba(15, 59, 117, 0.06);
      --shadow-hover: 0 8px 30px rgba(15, 59, 117, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --max-width: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      height: var(--header-height);
      z-index: 1000;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-weight: 700;
      font-size: 24px;
      color: var(--primary-dark);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo span {
      color: var(--accent);
    }

    .nav-links {
      display: flex;
      gap: 36px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.2s;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }

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

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      padding: 10px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary-dark);
      border-radius: 1px;
    }

    /* Hero */
    .hero {
      padding: calc(var(--header-height) + 60px) 0 80px;
      background: var(--bg-warm);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 55% 45%;
      gap: 60px;
      align-items: center;
    }

    .hero-badge {
      display: inline-block;
      background: rgba(26,86,219,0.06);
      color: var(--primary);
      font-weight: 600;
      font-size: 14px;
      padding: 6px 16px;
      border-radius: 30px;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }

    .hero h1 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--primary-dark);
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.6;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 90%;
    }

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

    .btn-primary {
      background: var(--accent);
      color: #FFFFFF;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s, transform 0.1s;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 12px rgba(232,168,56,0.2);
    }

    .btn-primary:hover {
      background: var(--accent-dark);
      transform: translateY(-1px);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s, color 0.2s;
    }

    .btn-outline:hover {
      background: rgba(26,86,219,0.08);
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      height: 400px;
      border-radius: 16px;
      box-shadow: 0 12px 30px rgba(0,0,0,0.08);
      position: relative;
    }

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

    .section-title {
      font-family: var(--font-title);
      font-weight: 600;
      font-size: 36px;
      line-height: 1.3;
      color: var(--primary-dark);
      margin-bottom: 16px;
    }

    .section-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 48px;
    }

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

    .highlight-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.2s;
      display: flex;
      flex-direction: column;
    }

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

    .highlight-card:first-child {
      grid-row: span 2;
    }

    .highlight-icon {
      width: 44px;
      height: 44px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .highlight-card h3 {
      font-family: var(--font-title);
      font-weight: 600;
      font-size: 20px;
      margin-bottom: 12px;
      color: var(--primary-dark);
    }

    .highlight-card p {
      color: var(--text-muted);
      font-size: 16px;
      line-height: 1.6;
    }

    /* 案例瀑布流 */
    .case-flow {
      columns: 2;
      column-gap: 20px;
    }

    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      margin-bottom: 20px;
      break-inside: avoid;
      transition: all 0.25s;
    }

    .case-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      height: 220px;
      object-fit: cover;
      width: 100%;
    }

    .case-content {
      padding: 20px;
    }

    .case-tag {
      background: #eef3ff;
      color: var(--primary);
      font-size: 12px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .case-title {
      font-weight: 600;
      font-size: 18px;
      margin-bottom: 6px;
    }

    .case-desc {
      font-size: 14px;
      color: var(--text-muted);
    }

    .view-more {
      margin-top: 30px;
      text-align: center;
    }

    .view-more a {
      font-weight: 600;
      color: var(--primary);
      border-bottom: 1px solid transparent;
      transition: border 0.2s;
    }

    .view-more a:hover {
      border-bottom-color: var(--primary);
    }

    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .compare-col {
      background: var(--bg-card);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }

    .compare-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 24px;
    }

    .compare-list {
      list-style: none;
      margin-bottom: 28px;
      flex: 1;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 8px 0;
      font-size: 16px;
    }

    .check-icon {
      color: var(--accent);
      font-weight: bold;
    }

    .cross-icon {
      color: #c0c6d0;
    }

    .compare-btn {
      margin-top: auto;
    }

    /* 数据条 */
    .stats-band {
      background: var(--primary);
      padding: 60px 0;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }

    .stat-item {
      color: white;
    }

    .stat-number {
      font-size: 64px;
      font-weight: 800;
      color: white;
      line-height: 1.1;
    }

    .stat-label {
      font-size: 14px;
      opacity: 0.7;
      letter-spacing: 0.5px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
      border-left: 3px solid transparent;
      transition: all 0.2s;
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }

    .faq-item.active {
      border-left-color: var(--accent);
    }

    .faq-number {
      font-size: 48px;
      font-weight: 200;
      color: var(--primary);
      line-height: 1;
      min-width: 60px;
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      margin-bottom: 8px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .faq-answer {
      font-size: 16px;
      color: var(--text-muted);
      display: none;
    }

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

    /* CTA 横幅 */
    .cta-band {
      background: var(--primary-dark);
      padding: 70px 0;
      text-align: center;
    }

    .cta-band h2 {
      color: white;
      font-size: 36px;
      margin-bottom: 20px;
    }

    .cta-band p {
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }

    .btn-cta-large {
      background: var(--accent);
      color: white;
      padding: 16px 40px;
      font-size: 18px;
      border-radius: var(--radius-btn);
    }

    /* 页脚 */
    .footer {
      background: var(--bg-footer);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 30px;
    }

    .footer-logo {
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 12px;
      color: var(--primary-dark);
    }

    .footer-links a {
      display: block;
      color: var(--text-main);
      margin-bottom: 8px;
      font-size: 15px;
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: var(--primary);
      text-decoration: underline;
    }

    .copyright {
      border-top: 1px solid var(--border-light);
      padding-top: 20px;
      font-size: 14px;
      color: var(--text-muted);
      text-align: center;
    }

    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
      .hero-grid {
        gap: 40px;
      }
    }

    @media (max-width: 768px) {
      .header {
        height: 60px;
      }
      .nav-links {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px;
        gap: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-image {
        height: 300px;
        order: -1;
      }
      .highlights-grid {
        grid-template-columns: 1fr;
      }
      .highlight-card:first-child {
        grid-row: auto;
      }
      .case-flow {
        columns: 1;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        gap: 32px;
      }
      .stat-number {
        font-size: 48px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      h1 {
        font-size: 38px;
      }
    }

    @media (max-width: 480px) {
      h1 {
        font-size: 32px;
      }
      .section-title {
        font-size: 28px;
      }
      .hero-buttons {
        flex-direction: column;
      }
      .btn-primary, .btn-outline {
        width: 100%;
        max-width: 280px;
      }
      .container {
        padding: 0 16px;
      }
    }