/* roulang page: index */
:root {
      --primary: #1A3C6D;
      --primary-deep: #142e54;
      --accent: #C47F3A;
      --accent-light: rgba(196, 127, 58, 0.08);
      --bg: #FAF9F7;
      --card-bg: #FFFFFF;
      --border: #E8E5E0;
      --text: #2C2C2C;
      --text-secondary: #6B6B6B;
      --text-on-primary: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
      --transition: 0.25s ease;
      --max-width: 1200px;
      --header-height: 64px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: 'Inter', 'SF Pro Text', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 15px;
      font-weight: 400;
      -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;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: #FFFFFF;
      box-shadow: 0 0.5px 0 0 rgba(0,0,0,0.06);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: 'Noto Serif SC', '思源宋体', Georgia, serif;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
      margin-left: auto;
      margin-right: 24px;
    }
    .nav-links a {
      font-size: 14px;
      color: #4A4A4A;
      font-weight: 500;
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .search-box {
      display: flex;
      align-items: center;
      background: #F1EFEC;
      border-radius: var(--radius-pill);
      padding: 6px 16px;
      width: 180px;
      transition: background var(--transition);
    }
    .search-box i {
      color: #8B8B8B;
      font-size: 13px;
      margin-right: 8px;
    }
    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 13px;
      color: var(--text);
      width: 100%;
    }
    .search-box input::placeholder {
      color: #9A9A9A;
    }
    .icon-btn {
      background: transparent;
      border: none;
      color: #4A4A4A;
      font-size: 18px;
      padding: 6px;
      transition: color var(--transition);
    }
    .icon-btn:hover {
      color: var(--primary);
    }
    .btn-accent-sm {
      background: var(--accent);
      color: white;
      border: none;
      border-radius: var(--radius-pill);
      padding: 8px 18px;
      font-size: 13px;
      font-weight: 600;
      transition: background var(--transition), transform var(--transition);
      white-space: nowrap;
    }
    .btn-accent-sm:hover {
      background: #b06f2e;
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
    }
    /* 通用区块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .container {
        padding: 0 20px;
      }
    }
    h1, h2, h3 {
      font-family: 'Noto Serif SC', '思源宋体', Georgia, serif;
      color: var(--primary);
    }
    h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
      font-weight: 600;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
      font-weight: 600;
    }
    .text-accent {
      color: var(--accent);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition);
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: var(--shadow-sm);
    }
    .btn-primary:hover {
      background: #142e54;
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
    }
    .btn-secondary:hover {
      background: rgba(26,60,109,0.05);
      transform: translateY(-1px);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
    }
    .btn-accent:hover {
      background: #b06f2e;
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    .text-link {
      color: var(--accent);
      font-weight: 500;
      border-bottom: 1px solid var(--accent);
      transition: border 0.2s;
    }
    .text-link:hover {
      border-bottom-width: 2px;
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      padding-top: calc(var(--header-height) + 40px);
      padding-bottom: 80px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: var(--shadow-hover);
      width: 100%;
      object-fit: cover;
    }
    .hero-stats {
      display: flex;
      gap: 32px;
      margin: 24px 0 32px;
    }
    .hero-stat span {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
    }
    .hero-stat small {
      display: block;
      color: var(--text-secondary);
      font-size: 13px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 亮点网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 20px;
    }
    /* 案例瀑布流 */
    .masonry {
      column-count: 3;
      column-gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      transition: all var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    .case-img {
      width: 100%;
      height: auto;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 20px 24px;
    }
    .case-tag {
      font-size: 13px;
      color: var(--accent);
      font-weight: 500;
    }
    /* 对比表 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }
    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .compare-card.recommended {
      border: 1px solid var(--accent);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
      align-self: flex-start;
      margin-bottom: 12px;
    }
    .compare-features {
      list-style: none;
      margin: 20px 0;
      flex: 1;
    }
    .compare-features li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    /* 信任带 */
    .trust-strip {
      background: #F0F2F6;
      padding: 64px 0;
    }
    .trust-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 24px;
    }
    .trust-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text);
      transition: color var(--transition);
    }
    .faq-question i {
      color: var(--accent);
      font-size: 18px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: #F0F3F7;
      text-align: center;
      padding: 80px 0;
    }
    /* 页脚 */
    .site-footer {
      background: #F5F4F1;
      padding: 60px 0 30px;
      font-size: 13px;
      color: var(--text-secondary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-family: 'Noto Serif SC', serif;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    @media (max-width: 1024px) {
      .nav-links, .search-box {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .hero {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .masonry {
        column-count: 2;
      }
      .trust-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 30px; }
      h2 { font-size: 24px; }
      .grid-3, .compare-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .masonry {
        column-count: 1;
      }
      .trust-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-stats {
        flex-direction: column;
        gap: 16px;
      }
    }