/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #D93A14;
      --dark: #1A1A1A;
      --bg: #F7F5F0;
      --white: #FFFFFF;
      --bronze: #8B7355;
      --gray-light: #F0EDE8;
      --text-secondary: #5C5C5C;
      --radius-card: 20px;
      --radius-nav: 16px;
      --radius-btn: 50px;
      --shadow-sm: 0 8px 30px rgba(0,0,0,0.04);
      --shadow-hover: 0 16px 45px rgba(240,78,35,0.12);
      --transition: 0.3s ease;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-number: 'Inter', sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--dark);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }
    
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    
    /* 标题装饰线 */
    .section-title {
      font-size: 2.8rem;
      font-weight: 700;
      margin-bottom: 20px;
      color: var(--dark);
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--primary);
      border-radius: 2px;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
    }
    
    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    
    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: var(--white);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      display: inline-block;
      text-align: center;
      transition: var(--transition);
      box-shadow: 0 4px 12px rgba(240,78,35,0.25);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #D93A14 0%, #B52E0E 100%);
      box-shadow: 0 10px 24px rgba(240,78,35,0.4);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 34px;
      border-radius: var(--radius-btn);
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(240,78,35,0.08);
    }
    .btn-white-outline {
      border: 2px solid var(--white);
      color: var(--white);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      display: inline-block;
    }
    .btn-white-outline:hover {
      background: var(--white);
      color: var(--primary);
    }
    
    /* 导航卡片化 */
    .nav-panel {
      background: var(--white);
      border-radius: var(--radius-nav);
      box-shadow: 0 8px 28px rgba(0,0,0,0.05);
      margin-top: 20px;
      padding: 0 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 80px;
      position: sticky;
      top: 20px;
      z-index: 50;
    }
    .logo-area {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      gap: 8px;
    }
    .nav-item {
      background: var(--gray-light);
      border-radius: 40px;
      padding: 10px 18px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--dark);
      display: flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition);
    }
    .nav-item i {
      font-size: 1rem;
      color: var(--bronze);
    }
    .nav-item:hover {
      background: var(--primary);
      color: var(--white);
    }
    .nav-item:hover i {
      color: var(--white);
    }
    .mobile-menu-btn {
      display: none;
      font-size: 1.8rem;
      color: var(--dark);
    }
    
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-panel {
        padding: 0 20px;
        height: 70px;
      }
    }
    /* 移动端菜单 */
    .mobile-dropdown {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(26,26,26,0.95);
      z-index: 100;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 28px;
    }
    .mobile-dropdown.active {
      display: flex;
    }
    .mobile-dropdown a {
      color: white;
      font-size: 1.8rem;
      font-weight: 500;
    }
    .close-mobile {
      position: absolute;
      top: 28px;
      right: 28px;
      font-size: 2.2rem;
      color: white;
    }
    
    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(to right, rgba(26,26,26,0.85) 0%, rgba(26,26,26,0.3) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      padding: 0 24px;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 4rem;
      font-weight: 700;
      line-height: 1.15;
      margin-bottom: 24px;
    }
    .hero h1 span {
      color: var(--primary);
    }
    .hero p {
      font-size: 1.25rem;
      margin-bottom: 36px;
      opacity: 0.9;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 400px;
    }
    .hero-image img {
      border-radius: var(--radius-card);
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.5rem;
      }
      .hero-content {
        flex-direction: column;
      }
    }
    
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 40px;
    }
    .service-card {
      padding: 2.5rem 2rem;
      text-align: left;
    }
    .service-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 数据徽章 */
    .data-wall {
      background: #EFECE6;
      border-radius: 30px;
      padding: 50px 30px;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 25px;
      margin-top: 30px;
    }
    .stat-badge {
      background: white;
      border: 1px solid var(--bronze);
      border-radius: var(--radius-card);
      padding: 24px 16px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 3rem;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 0.95rem;
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 40px;
    }
    .case-card img {
      border-radius: 20px 20px 0 0;
      height: 220px;
      object-fit: cover;
      width: 100%;
    }
    .case-info {
      padding: 20px 24px;
    }
    .case-info h3 {
      font-weight: 600;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      margin-top: 40px;
      flex-wrap: wrap;
      gap: 20px;
    }
    .step {
      flex: 1 1 200px;
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
    }
    .step-number {
      font-family: var(--font-number);
      font-size: 3rem;
      font-weight: 700;
      color: rgba(240,78,35,0.2);
    }
    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
      }
    }
    
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 16px;
      margin-bottom: 16px;
      padding: 18px 24px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 500;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #4a4a4a;
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 14px;
    }
    
    /* CTA */
    .cta-block {
      background: linear-gradient(135deg, #F04E23 0%, #D93A14 100%);
      text-align: center;
      padding: 80px 24px;
    }
    
    /* Footer */
    .footer {
      background: var(--dark);
      color: #ccc;
      padding: 60px 24px 30px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }
    .footer a {
      color: #ccc;
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 0.85rem;
      opacity: 0.7;
    }