/* roulang page: index */
:root {
      --primary: #2C3E50;
      --primary-dark: #1A2A3A;
      --accent: #C9A96E;
      --bg-warm: #FAFAF7;
      --white: #FFFFFF;
      --text-main: #4A4A4A;
      --text-secondary: #7A7A7A;
      --text-light: #E0E0E0;
      --border-subtle: #E6E9ED;
      --shadow-card: 0 4px 20px rgba(44,62,80,0.06);
      --shadow-card-hover: 0 12px 32px rgba(44,62,80,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-base: 0.25s ease;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --font-en: "Inter", "SF Pro Display", sans-serif;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 40px;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--white);
      height: 72px;
      border-bottom: 1px solid var(--border-subtle);
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 2px;
      text-decoration: none;
      font-family: var(--font-cn);
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--primary);
      font-weight: 500;
      font-size: 16px;
      transition: color var(--transition-base);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover {
      color: var(--accent);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: rgba(44,62,80,0.95);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        backdrop-filter: blur(8px);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        color: white;
        font-size: 24px;
        font-weight: 600;
      }
      .menu-toggle {
        display: block;
      }
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }

    /* Hero */
    .hero {
      padding: 0 0 80px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-left {
      flex: 1 1 55%;
    }
    .hero-right {
      flex: 1 1 40%;
      min-height: 400px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .hero-right::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(44,62,80,0.25) 0%, rgba(44,62,80,0.05) 100%);
      border-radius: 24px;
    }
    h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--primary);
      margin-bottom: 20px;
      letter-spacing: 1px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      text-decoration: none;
      display: inline-block;
      transition: background var(--transition-base), box-shadow var(--transition-base);
      box-shadow: 0 4px 10px rgba(44,62,80,0.1);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 0 1px var(--accent) inset, 0 8px 20px rgba(44,62,80,0.2);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: all var(--transition-base);
    }
    .btn-outline:hover {
      background: rgba(44,62,80,0.05);
      border-color: var(--accent);
      color: var(--primary-dark);
    }

    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column-reverse;
        gap: 32px;
      }
      .hero-right {
        min-height: 280px;
        width: 100%;
      }
      h1 {
        font-size: 32px;
      }
    }

    /* 亮点网格 非对称 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
      cursor: pointer;
      border: none;
    }
    .highlight-card.span-2 {
      grid-column: span 2;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .highlight-icon {
      font-size: 40px;
      color: var(--accent);
      margin-bottom: 16px;
    }
    .highlight-title {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .highlight-desc {
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.6;
    }

    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
      .highlight-card.span-2 {
        grid-column: span 1;
      }
    }

    /* 案例瀑布 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all var(--transition-base);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      height: 220px;
      overflow: hidden;
      background: #f0f2f5;
      position: relative;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 20px;
    }
    .case-title {
      font-size: 18px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .case-tag {
      color: var(--accent);
      font-weight: 500;
      font-size: 14px;
      letter-spacing: 0.5px;
    }

    @media (max-width: 1024px) {
      .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 520px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 方案对比 */
    .compare-row {
      display: flex;
      gap: 0;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      background: white;
    }
    .compare-col {
      flex: 1;
      padding: 32px;
      background: white;
    }
    .compare-col.left {
      background: #FFF5F5;
    }
    .compare-col.right {
      background: #F4F8FC;
    }
    .compare-header {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .icon-cross {
      color: #C0392B;
      font-weight: bold;
    }
    .icon-check {
      color: var(--accent);
      font-weight: bold;
    }

    @media (max-width: 768px) {
      .compare-row {
        flex-direction: column;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--white);
      border-radius: 8px;
      margin-bottom: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: background 0.2s;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #F4F6F9;
      padding: 0 24px;
      color: var(--text-main);
    }
    .faq-item.active .faq-answer {
      max-height: 160px;
      padding: 20px 24px;
    }
    .faq-item.active {
      background: #F4F6F9;
    }
    .faq-arrow {
      font-size: 20px;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-banner {
      background: rgba(44,62,80,0.06);
      text-align: center;
      padding: 70px 20px;
      border-radius: 24px;
    }
    .cta-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
    }

    /* 页脚 */
    .site-footer {
      background: var(--primary);
      color: var(--text-light);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .footer-col a, .footer-col p {
      color: #CCCCCC;
      text-decoration: none;
      font-size: 15px;
      line-height: 2;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
      text-align: center;
      background: #1A2A3A;
      color: #AAAAAA;
      font-size: 14px;
    }

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