/* roulang page: index */
:root {
      --primary: #0D9488;
      --primary-deep: #0B7A69;
      --secondary: #2D3A3A;
      --bg-warm: #F5F0E8;
      --white: #FFFFFF;
      --accent: #F97316;
      --text-main: #2D3A3A;
      --text-muted: #5F6B6B;
      --border-light: #E2DCD3;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 600;
      color: var(--secondary);
    }
    h1 {
      font-size: 44px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 700;
    }
    h4 {
      font-size: 18px;
      line-height: 1.5;
      font-weight: 600;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      font-weight: 600;
      transition: all 0.3s ease;
    }
    .section {
      padding: 80px 0;
    }
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 20px;
    }
    .logo-text {
      font-size: 22px;
      font-weight: 700;
      color: var(--secondary);
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--secondary);
    }
    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--primary-deep);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-accent:hover {
      background: #e0670f;
    }
    .btn-white-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-white-outline:hover {
      background: white;
      color: var(--primary);
    }
    /* Hero */
    .hero {
      padding: 160px 0 120px;
      background: linear-gradient(180deg, #F5F0E8 0%, #FFFFFF 100%);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-left h1 {
      margin-bottom: 16px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-right {
      flex: 1;
    }
    .hero-right img {
      border-radius: 16px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      width: 100%;
    }
    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: var(--white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 0.3s ease;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .highlight-card h3 {
      margin-bottom: 8px;
    }
    .highlight-card p {
      color: var(--text-muted);
      font-size: 14px;
    }
    /* 产品瀑布流 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .product-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .product-img {
      aspect-ratio: 16/9;
      object-fit: cover;
      width: 100%;
    }
    .product-content {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tag {
      display: inline-block;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      margin-bottom: 12px;
      width: fit-content;
    }
    .product-content h3 {
      margin-bottom: 8px;
    }
    .product-desc {
      color: var(--text-muted);
      font-size: 15px;
      margin-bottom: 16px;
      flex: 1;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: auto;
    }
    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 40px;
      align-items: stretch;
    }
    .compare-col {
      flex: 1;
      background: var(--white);
      padding: 40px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .compare-col.highlight {
      border: 2px solid var(--primary);
    }
    .compare-title {
      font-size: 24px;
      margin-bottom: 24px;
    }
    .compare-list {
      list-style: none;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .icon-check {
      color: var(--primary);
      font-weight: bold;
    }
    .icon-cross {
      color: #B0B0B0;
    }
    /* FAQ */
    .faq-grid {
      display: flex;
      gap: 60px;
    }
    .faq-left {
      flex: 1;
    }
    .faq-right {
      flex: 1.5;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
      border-left: 3px solid var(--primary);
      margin-left: 20px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      font-size: 22px;
      color: var(--primary);
    }
    /* CTA */
    .cta-band {
      background: var(--primary);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      color: white;
    }
    /* 页脚 */
    .main-footer {
      background: var(--secondary);
      color: #CCCCCC;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    .footer-desc {
      font-size: 14px;
      line-height: 1.7;
    }
    .footer-col h4 {
      color: white;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 8px;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .copyright {
      border-top: 1px solid #4A5555;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
    }
    /* 移动端 */
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .highlights-grid,
      .product-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .compare-row {
        flex-direction: column;
      }
      .faq-grid {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 24px;
      }
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--bg-warm);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .highlights-grid,
      .product-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }