/* roulang page: index */
:root {
      --primary: #C4734B;
      --primary-deep: #A85D3A;
      --secondary: #E8C382;
      --bg-warm: #FBF7F2;
      --white: #FFFFFF;
      --text-dark: #2C241A;
      --text-mid: #6B5E52;
      --text-light: #A69888;
      --border-light: #E8E0D5;
      --shadow-sm: 0 4px 20px rgba(44,36,26,0.06);
      --shadow-hover: 0 8px 32px rgba(44,36,26,0.12);
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --space-section: 120px;
      --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.2s ease;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      padding-top: 72px;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, input {
      font-family: inherit;
      outline: none;
    }

    h1, h2, h3 {
      color: var(--text-dark);
    }

    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
    }

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-mid);
      max-width: 600px;
      margin: 0 auto;
      text-align: center;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.3s;
    }

    .header-shadow {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }

    .logo i {
      font-size: 28px;
      color: var(--secondary);
    }

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

    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 8px 0;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: 30px;
      font-weight: 600;
    }

    .nav-cta:hover {
      background: var(--primary-deep);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text-dark);
    }

    /* Hero */
    .hero {
      padding: 100px 0;
      background: var(--bg-warm);
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 0 0 55%;
    }

    .hero-right {
      flex: 0 0 45%;
      background: linear-gradient(135deg, #fbe9d7 0%, #f5d5b8 100%);
      border-radius: var(--radius-lg);
      overflow: hidden;
      min-height: 420px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-right img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
      color: var(--text-dark);
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 40px;
      max-width: 90%;
    }

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

    .btn {
      display: inline-block;
      padding: 14px 32px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 16px;
      transition: all 0.2s ease;
      text-align: center;
      border: 2px solid transparent;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      border-color: var(--primary-deep);
      transform: scale(1.03);
      box-shadow: 0 4px 12px rgba(196,115,75,0.3);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background: rgba(232,195,130,0.1);
      border-color: var(--secondary);
      color: var(--primary-deep);
    }

    .btn-white {
      background: white;
      color: var(--primary);
      border-color: white;
    }

    .btn-white:hover {
      background: #f0e4d4;
      border-color: #f0e4d4;
      color: var(--primary-deep);
    }

    /* 亮点网格 */
    .features {
      padding: var(--space-section) 0;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .feature-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s;
      text-align: center;
    }

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

    .feature-icon {
      width: 72px;
      height: 72px;
      background: rgba(232,195,130,0.2);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 24px;
      font-size: 32px;
      color: var(--primary);
    }

    .feature-badge {
      display: inline-block;
      background: var(--bg-warm);
      color: var(--primary);
      font-weight: 700;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 14px;
      margin-bottom: 16px;
    }

    /* 案例瀑布 */
    .cases {
      padding: var(--space-section) 0;
      background: var(--white);
    }

    .cases-masonry {
      columns: 2;
      column-gap: 32px;
    }

    .case-card {
      break-inside: avoid;
      background: var(--bg-warm);
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 32px;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
    }

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

    .case-img {
      height: 220px;
      background: #e3d6c8;
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-content {
      padding: 24px;
    }

    .case-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 12px;
    }

    .tag {
      background: #e8dfd2;
      color: var(--text-dark);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 500;
    }

    .case-content h3 {
      margin-bottom: 8px;
    }

    .case-content p {
      color: var(--text-mid);
      font-size: 15px;
      margin-bottom: 16px;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .text-link:hover {
      text-decoration: underline;
    }

    /* 方案对比 */
    .compare {
      padding: var(--space-section) 0;
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1px 1fr;
      gap: 40px;
      align-items: start;
    }

    .compare-col {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .compare-divider {
      width: 1px;
      background: var(--border-light);
      height: 100%;
      margin: 0 auto;
    }

    .compare-list {
      list-style: none;
      margin: 24px 0;
    }

    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 16px;
    }

    .compare-list i {
      width: 24px;
    }

    .icon-fail {
      color: #c4b6a6;
    }

    .icon-check {
      color: var(--secondary);
    }

    /* 数据墙 */
    .data-wall {
      padding: 100px 0;
      background: linear-gradient(135deg, #C4734B 0%, #b85f3a 100%);
      color: white;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }

    .stat-item {
      flex: 1;
      min-width: 160px;
    }

    .stat-number {
      font-size: 56px;
      font-weight: 800;
      color: white;
      line-height: 1.1;
    }

    .stat-unit {
      font-size: 24px;
      font-weight: 500;
      margin-left: 4px;
    }

    .stat-label {
      font-size: 16px;
      opacity: 0.9;
    }

    /* FAQ */
    .faq {
      padding: var(--space-section) 0;
      background: var(--white);
    }

    .accordion {
      max-width: 800px;
      margin: 0 auto;
    }

    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }

    .accordion-btn {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 24px 0;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-dark);
    }

    .accordion-btn span {
      color: var(--primary);
      margin-right: 12px;
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }

    .accordion-content p {
      padding-bottom: 20px;
      color: var(--text-mid);
    }

    .accordion-item.active .accordion-content {
      max-height: 200px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary);
      padding: 100px 0;
      text-align: center;
      color: white;
    }

    .cta-banner h2 {
      color: white;
      font-size: 40px;
    }

    .cta-banner p {
      font-size: 18px;
      opacity: 0.85;
      margin-bottom: 32px;
    }

    /* 页脚 */
    .footer {
      background: #2C241A;
      color: #d4c9bc;
      padding: 80px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 40px;
      margin-bottom: 60px;
    }

    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }

    .footer a {
      color: #c4b6a6;
    }

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

    .social-icons {
      display: flex;
      gap: 16px;
      font-size: 24px;
    }

    .footer-form {
      display: flex;
      gap: 8px;
      margin-top: 16px;
    }

    .footer-form input {
      flex: 1;
      padding: 12px 16px;
      border-radius: 30px;
      border: 1px solid #5a4e42;
      background: #3f362e;
      color: white;
    }

    .footer-form button {
      background: var(--primary);
      border: none;
      color: white;
      padding: 0 24px;
      border-radius: 30px;
      font-weight: 600;
    }

    .copyright {
      text-align: center;
      border-top: 1px solid #4a4036;
      padding-top: 24px;
      color: #9b8e80;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        flex: auto;
        width: 100%;
      }
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cases-masonry {
        columns: 1;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .compare-divider {
        display: none;
      }
    }

    @media (max-width: 640px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .features-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        gap: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--bg-warm);
      padding: 32px;
      flex-direction: column;
      gap: 24px;
      z-index: 99;
    }

    .mobile-menu.open {
      display: flex;
    }