/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary-burgundy: #9B1B30;
      --primary-burgundy-deep: #7A1526;
      --secondary-warm-gray: #F2EFE9;
      --dark-anchor: #2C2C2C;
      --accent-gold: #C8963E;
      --teal-green: #1E7A6B;
      --teal-deep: #165C52;
      --white: #FFFFFF;
      --gray-border: #D9D9D9;
      --light-faq: #FAFAF8;
      --text-muted: rgba(44, 44, 44, 0.7);
      --shadow-sm: 0 4px 16px rgba(44, 44, 44, 0.06);
      --shadow-md: 0 8px 24px rgba(44, 44, 44, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-en: 'Inter', sans-serif;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--secondary-warm-gray);
      color: var(--dark-anchor);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: box-shadow 0.3s;
    }

    .site-header.scrolled {
      box-shadow: var(--shadow-sm);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-icon {
      font-size: 28px;
      color: var(--primary-burgundy);
    }

    .logo-text {
      font-family: var(--font-en);
      font-weight: 700;
      font-size: 22px;
      letter-spacing: -0.5px;
      color: var(--dark-anchor);
    }

    .logo-text span {
      color: var(--primary-burgundy);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-weight: 500;
      font-size: 15px;
      color: var(--dark-anchor);
      position: relative;
      padding-bottom: 6px;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--accent-gold);
      transition: width 0.25s ease;
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary-burgundy);
      color: var(--white);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      font-size: 16px;
      letter-spacing: 0.3px;
      border: 1px solid transparent;
    }

    .btn-primary:hover {
      background: var(--primary-burgundy-deep);
      border-color: var(--accent-gold);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--dark-anchor);
      color: var(--dark-anchor);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: 0.25s;
      cursor: pointer;
      font-size: 16px;
    }

    .btn-outline:hover {
      background: rgba(200, 150, 62, 0.1);
      border-color: var(--accent-gold);
      color: var(--accent-gold);
    }

    .btn-teal {
      background: var(--teal-green);
      color: var(--white);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: 0.25s;
      font-size: 16px;
    }

    .btn-teal:hover {
      background: var(--teal-deep);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--dark-anchor);
      cursor: pointer;
    }

    /* Hero 双栏 */
    .hero {
      display: flex;
      align-items: center;
      gap: 60px;
      padding: 60px 0 80px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-right {
      flex: 1;
      position: relative;
    }

    .hero-title {
      font-size: 46px;
      font-weight: 700;
      line-height: 1.15;
      color: var(--dark-anchor);
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 18px;
      line-height: 1.7;
      color: var(--text-muted);
      margin-bottom: 36px;
    }

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

    .hero-image {
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
    }

    .hero-image::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 30%;
      background: linear-gradient(to top, rgba(155,27,48,0.18), transparent);
      pointer-events: none;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 32px;
    }

    .stat-item h3 {
      font-family: var(--font-en);
      font-size: 32px;
      font-weight: 700;
      color: var(--accent-gold);
    }

    .stat-item p {
      font-size: 14px;
      color: var(--dark-anchor);
      font-weight: 500;
    }

    /* 区块标题 */
    .section-title {
      font-size: 34px;
      font-weight: 600;
      margin-bottom: 24px;
      color: var(--dark-anchor);
    }

    .section-header {
      margin-bottom: 48px;
    }

    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin: 60px 0;
    }

    .highlight-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
    }

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

    .highlight-icon {
      font-size: 32px;
      color: var(--primary-burgundy);
      margin-bottom: 20px;
    }

    .highlight-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 案例瀑布流 */
    .case-waterfall {
      columns: 3;
      column-gap: 24px;
      margin: 60px 0;
    }

    .case-card {
      break-inside: avoid;
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      transition: 0.3s;
    }

    .case-card:hover {
      box-shadow: var(--shadow-md);
    }

    .case-card img {
      width: 100%;
      transition: transform 0.4s;
    }

    .case-card:hover img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-tag {
      background: rgba(155,27,48,0.1);
      color: var(--primary-burgundy);
      font-size: 13px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 10px;
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      flex-direction: column;
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .compare-row {
      display: flex;
      border-bottom: 1px solid #f0f0f0;
    }

    .compare-row:last-child {
      border: none;
    }

    .compare-cell {
      flex: 1;
      padding: 20px 28px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .compare-left {
      background: #fafaf8;
      color: var(--text-muted);
      font-weight: 500;
    }

    .compare-right {
      font-weight: 600;
      color: var(--primary-burgundy);
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 22px 28px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--dark-anchor);
    }

    .faq-icon {
      color: var(--accent-gold);
      transition: transform 0.3s;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: var(--light-faq);
      padding: 0 28px;
      line-height: 1.8;
      color: var(--dark-anchor);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 20px 28px;
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* 联系 */
    .contact-grid {
      display: flex;
      gap: 48px;
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 48px;
      box-shadow: var(--shadow-sm);
      margin: 60px 0;
    }

    .contact-form {
      flex: 1.5;
    }

    .input-field {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--gray-border);
      border-radius: var(--radius-input);
      margin-bottom: 18px;
      font-family: inherit;
      transition: 0.2s;
    }

    .input-field:focus {
      outline: none;
      border-color: var(--primary-burgundy);
    }

    .contact-info {
      flex: 1;
    }

    /* 页脚 */
    .footer {
      background: var(--dark-anchor);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
      margin-top: 80px;
    }

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

    .footer a:hover {
      color: var(--accent-gold);
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
      }
      .highlight-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-waterfall {
        columns: 2;
      }
    }

    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .highlight-grid {
        grid-template-columns: 1fr;
      }
      .case-waterfall {
        columns: 1;
      }
      .contact-grid {
        flex-direction: column;
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        flex-wrap: wrap;
      }
    }