/* roulang page: index */
/* 设计变量与reset/base */
    :root {
      --orange-start: #FF4D2E;
      --orange-end: #FF7A45;
      --deep-blue: #0B1A2D;
      --bg-warm: #FAFAF8;
      --neon-cyan: #00F0C8;
      --text-primary: #1A1A1A;
      --text-secondary: #555555;
      --text-light: #777777;
      --white: #FFFFFF;
      --border-light: #E5E5E5;
      --card-shadow: 0 8px 28px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 18px 40px rgba(0,0,0,0.08);
      --radius-card: 24px;
      --radius-btn: 40px;
      --radius-badge: 40px;
      --transition-base: all 0.3s ease;
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, input, textarea {
      font-family: inherit;
    }
    
    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
      width: 100%;
    }
    
    /* 导航样式 - 白底平台导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      height: 72px;
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-weight: 800;
      font-size: 1.75rem;
      letter-spacing: -0.5px;
      color: var(--deep-blue);
      display: flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, var(--orange-start) 0%, var(--orange-end) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--orange-start);
      font-size: 2rem;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-primary);
      position: relative;
      padding: 6px 0;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(to right, var(--orange-start), var(--orange-end));
      transition: width 0.3s ease;
      border-radius: 4px;
    }
    
    .nav-links a:hover {
      color: var(--orange-start);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    /* 移动端导航 - 汉堡图标与底部胶囊 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--deep-blue);
      cursor: pointer;
    }
    
    .mobile-nav-drawer {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      box-shadow: 0 12px 24px rgba(0,0,0,0.08);
      flex-direction: column;
      padding: 20px 24px;
      gap: 16px;
      z-index: 999;
    }
    .mobile-nav-drawer a {
      font-size: 1.2rem;
      font-weight: 600;
      padding: 12px 0;
      text-align: center;
      color: var(--text-primary);
      border-bottom: 1px solid #f0f0f0;
    }
    
    /* 区块通用间距 */
    section {
      padding: 100px 0;
    }
    
    /* Hero 首屏 */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      background-color: var(--bg-warm);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: clamp(2.4rem, 5vw, 3.6rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: var(--deep-blue);
      background: linear-gradient(to right, var(--deep-blue), #2A3F5A);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-content .sub-title {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      line-height: 1.8;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--orange-start), var(--orange-end));
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.3px;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 8px 18px rgba(255,77,46,0.25);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--orange-end), var(--orange-start));
      transform: scale(1.03);
      box-shadow: 0 14px 26px rgba(255,77,46,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--orange-start);
      color: var(--orange-start);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
    }
    .btn-outline:hover {
      background: var(--orange-start);
      color: white;
    }
    
    .data-dashboard {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      border-radius: 32px;
      overflow: hidden;
      min-height: 380px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .dashboard-overlay {
      background: rgba(11, 26, 45, 0.5);
      backdrop-filter: blur(6px);
      width: 100%;
      height: 100%;
      padding: 28px;
      display: flex;
      flex-direction: column;
      gap: 24px;
      justify-content: center;
    }
    .float-card {
      background: rgba(255,255,255,0.18);
      backdrop-filter: blur(12px);
      border-radius: 20px;
      padding: 20px 24px;
      color: white;
      display: flex;
      align-items: center;
      gap: 20px;
      border: 1px solid rgba(255,255,255,0.3);
    }
    .float-card i {
      font-size: 2.2rem;
      color: var(--neon-cyan);
    }
    
    /* 服务矩阵 */
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 0.6rem;
    }
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 48px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition-base);
      position: relative;
      border-top: 4px solid transparent;
      background-clip: padding-box;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--card-hover-shadow);
      border-top: 4px solid var(--orange-start);
    }
    .service-icon {
      font-size: 2.4rem;
      background: linear-gradient(135deg, var(--orange-start), var(--orange-end));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 1.2rem;
    }
    .badge-cyan {
      background: var(--neon-cyan);
      color: var(--deep-blue);
      padding: 4px 14px;
      border-radius: var(--radius-badge);
      font-size: 0.8rem;
      font-weight: 700;
      display: inline-block;
      margin-top: 14px;
    }
    
    /* 数据指标 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .stat-item {
      background: white;
      border-radius: 20px;
      padding: 24px;
      text-align: center;
    }
    .stat-number {
      font-size: 2.6rem;
      font-weight: 800;
      background: linear-gradient(to right, var(--orange-start), var(--neon-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 18px;
      margin-bottom: 14px;
      border: 1px solid #EEE;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 24px 20px;
      color: #555;
    }
    
    /* 页脚 */
    .footer {
      background: var(--deep-blue);
      color: #CCD6E0;
      padding: 60px 0 25px;
    }
    
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-toggle { display: block; }
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .btn-group .btn-primary, .btn-group .btn-outline { width: 100%; }
    }
    @media (max-width: 520px) {
      section { padding: 70px 0; }
    }