/* roulang page: index */
:root {
      --primary: #0F0F0F;
      --accent: #E63946;
      --bg: #FAFAFA;
      --white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-muted: #5A5A5A;
      --text-light: #999999;
      --border-light: #EEEEEE;
      --border-table: #E0E0E0;
      --footer-bg: #1A1A1A;
      --footer-dark: #0A0A0A;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 50px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.06);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --transition: 0.25s ease-out;
      --container: 1280px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid transparent;
      box-shadow: var(--shadow-nav);
      transition: var(--transition);
    }

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

    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo span {
      color: var(--accent);
      font-weight: 500;
      font-size: 0.9rem;
      margin-left: 2px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 30px;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      transition: color var(--transition);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }

    .nav-cta {
      background: var(--accent);
      color: var(--white) !important;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: background var(--transition), transform var(--transition);
    }
    .nav-cta:hover {
      background: #c52735;
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 28px;
      height: 22px;
      justify-content: center;
    }
    .hamburger span {
      display: block;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    /* 移动端导航面板 */
    .mobile-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s ease, visibility 0.3s;
      z-index: 200;
      gap: 32px;
    }
    .mobile-panel.open {
      opacity: 1;
      visibility: visible;
    }
    .mobile-panel a {
      color: white;
      font-size: 1.5rem;
      font-weight: 500;
    }
    .close-panel {
      position: absolute;
      top: 28px;
      right: 28px;
      font-size: 2rem;
      color: var(--accent);
      background: transparent;
      border: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -0.02em;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1.1rem;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
    }
    .btn-primary:hover {
      background: #c52735;
      transform: translateY(-2px);
    }
    .btn-link {
      font-weight: 600;
      color: var(--text-main);
      border-bottom: 2px solid var(--accent);
      padding-bottom: 2px;
      transition: color var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .btn-link:hover {
      color: var(--accent);
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: var(--radius-card);
      height: 380px;
      box-shadow: var(--shadow-md);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-right {
        width: 100%;
      }
      .hero h1 {
        font-size: 2.5rem;
      }
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      transition: transform var(--transition), box-shadow var(--transition);
      border: 1px solid var(--border-light);
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .highlight-icon {
      font-size: 2.5rem;
      color: var(--accent);
      margin-bottom: 16px;
      line-height: 1;
    }
    .highlight-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .highlight-card p {
      color: var(--text-muted);
    }

    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: transform var(--transition), box-shadow var(--transition);
    }
    .case-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent);
    }
    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
    }
    .case-body {
      padding: 20px;
    }
    .case-body h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
    }
    .badge {
      display: inline-block;
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: 20px;
      margin-top: 8px;
      font-weight: 600;
      letter-spacing: 0.04em;
      text-transform: uppercase;
    }

    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 方案对比表 */
    .compare-table-wrapper {
      overflow-x: auto;
      border-radius: 0;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 600px;
    }
    .compare-table th {
      background: var(--primary);
      color: white;
      padding: 18px 16px;
      text-align: center;
      font-weight: 600;
    }
    .compare-table td {
      padding: 16px;
      text-align: center;
      border-bottom: 1px solid var(--border-table);
      background: white;
    }
    .compare-table .feature-name {
      text-align: left;
      font-weight: 500;
    }
    .accent-check {
      color: var(--accent);
      font-weight: 700;
    }
    .badge-recommend {
      background: var(--accent);
      color: white;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid #F0F0F0;
      padding: 18px 0;
    }
    .faq-question {
      font-size: 1.1rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: transparent;
      width: 100%;
      text-align: left;
      border: none;
    }
    .faq-icon {
      font-size: 1.5rem;
      transition: transform var(--transition);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
      color: var(--accent);
    }

    /* 全局CTA */
    .cta-band {
      background: var(--primary);
      text-align: center;
      padding: 80px 0;
    }
    .cta-band h2 {
      color: white;
      font-size: 2.4rem;
      margin-bottom: 16px;
    }
    .cta-band p {
      color: #ccc;
      margin-bottom: 30px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--footer-bg);
      color: #ccc;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 40px;
    }
    .footer-col h4 {
      color: white;
      font-size: 0.9rem;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-col a {
      display: block;
      color: var(--text-light);
      margin-bottom: 8px;
      font-size: 0.9rem;
    }
    .footer-col a:hover {
      color: var(--accent);
    }
    .copyright {
      background: var(--footer-dark);
      text-align: center;
      padding: 20px 0;
      font-size: 0.8rem;
      color: #666;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }