/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-dark: #D03E1A;
      --secondary: #1A1A1A;
      --gold: #F5A623;
      --bg: #FAF8F5;
      --white: #FFFFFF;
      --gray-light: #F0F0F0;
      --gray-mid: #B0B0B0;
      --gray-text: #555555;
      --text-dark: #1E1E1E;
      --border: #E0E0E0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --radius-md: 8px;
      --radius-lg: 12px;
      --transition: all 0.25s ease;
      --font-body: 'Noto Sans SC', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --font-number: 'Inter', 'Noto Sans SC', sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    h1, h2, h3, h4 {
      font-weight: 700;
      scroll-margin-top: 80px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      border: none;
      font-family: inherit;
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    
    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      height: 64px;
      z-index: 99;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      border-bottom: 1px solid rgba(0,0,0,0.02);
    }
    
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--secondary);
      letter-spacing: -0.3px;
    }
    
    .logo i {
      font-size: 28px;
      color: var(--primary);
      transition: transform 0.2s;
    }
    
    .logo:hover i {
      transform: scale(1.1);
    }
    
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-link {
      font-weight: 500;
      color: var(--secondary);
      position: relative;
      padding: 6px 0;
      font-size: 16px;
      transition: color 0.2s;
    }
    
    .nav-link::after {
      content: "";
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    
    .nav-link:hover,
    .nav-link.active {
      color: var(--primary);
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }
    
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--secondary);
    }
    
    /* 按钮系统 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(240,78,35,0.25);
    }
    
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(240,78,35,0.35);
    }
    
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--secondary);
      color: var(--secondary);
      border-radius: var(--radius-md);
      padding: 13px 32px;
    }
    
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(240,78,35,0.03);
    }
    
    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: linear-gradient(135deg, #1A1A1A 0%, #2A2522 45%, #FAF8F5 85%);
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }
    
    .hero-left h1 {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.25;
      color: white;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.4);
    }
    
    .hero-left h1 span {
      color: var(--gold);
      position: relative;
    }
    
    .hero-left p {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 540px;
    }
    
    .hero-stats {
      display: flex;
      gap: 28px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    
    .stat-item {
      color: white;
    }
    
    .stat-number {
      font-family: var(--font-number);
      font-size: 38px;
      font-weight: 700;
      color: var(--gold);
    }
    
    .stat-label {
      font-size: 15px;
      opacity: 0.8;
    }
    
    .hero-right {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(10px);
      border-radius: 28px;
      padding: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .hero-right img {
      border-radius: 18px;
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    
    /* 数据看板 */
    .dashboard {
      padding: 70px 0;
      background: var(--white);
    }
    
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      text-align: center;
    }
    
    .dash-card {
      padding: 28px 16px;
      background: var(--bg);
      border-radius: var(--radius-lg);
      transition: var(--transition);
    }
    
    .dash-card i {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    
    .dash-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }
    
    /* 通用板块 */
    .section {
      padding: 80px 0;
    }
    
    .section-title {
      font-size: 30px;
      font-weight: 700;
      margin-bottom: 16px;
      display: inline-block;
      position: relative;
    }
    
    .section-title::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -10px;
      width: 50px;
      height: 3px;
      background: var(--primary);
    }
    
    .services-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr 1fr;
      gap: 28px;
      margin-top: 48px;
    }
    
    .service-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 28px 18px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid rgba(0,0,0,0.02);
    }
    
    .service-card.large {
      grid-column: span 2;
      display: flex;
      gap: 24px;
      align-items: center;
    }
    
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    
    .service-icon {
      font-size: 36px;
      color: var(--primary);
    }
    
    .flow-steps {
      display: flex;
      justify-content: space-between;
      margin-top: 48px;
    }
    
    .step {
      text-align: center;
      flex:1;
      position: relative;
    }
    
    .comparison {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #fff;
      padding: 32px;
      border-radius: var(--radius-lg);
    }
    
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 18px 0;
      cursor: pointer;
    }
    
    .cta-form {
      background: var(--secondary);
      border-radius: 20px;
      padding: 56px 44px;
      text-align: center;
      color: white;
    }
    
    .footer {
      background: var(--secondary);
      color: #B0B0B0;
      padding: 60px 0 20px;
    }
    
    @media (max-width: 1024px) {
      .services-grid {
        grid-template-columns: 1fr 1fr;
      }
      .service-card.large {
        grid-column: span 1;
        flex-direction: column;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .comparison {
        grid-template-columns: 1fr;
      }
    }
    
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        width: 260px;
        background: white;
        flex-direction: column;
        padding: 80px 28px;
        gap: 28px;
        box-shadow: -4px 0 16px rgba(0,0,0,0.05);
      }
      .menu-toggle {
        display: block;
      }
      .dashboard-grid {
        grid-template-columns: 1fr;
      }
      .flow-steps {
        flex-direction: column;
        gap:40px;
      }
    }