/* roulang page: index */
:root {
      --primary-deep: #1A1D23;
      --accent-signal: #00E676;
      --warm-orange: #FF6D00;
      --bg-light: #F4F6F9;
      --card-white: #FFFFFF;
      --dark-block: #252830;
      --text-main: #1A1D23;
      --text-secondary: #5F6B7A;
      --border-light: #E5E9F0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 6px 20px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: 0.2s ease;
      --font-system: -apple-system, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-system);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航栏 - 卡片化控制面板 */
    .ng28-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 99;
      background: rgba(26, 29, 35, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
      padding: 0 24px;
    }
    
    .nav-inner {
      max-width: 1200px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    
    .logo-area {
      font-size: 1.8rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: 1px;
    }
    .logo-area span {
      color: var(--accent-signal);
    }
    
    .nav-links {
      display: flex;
      gap: 8px;
      align-items: center;
    }
    
    .nav-card {
      background: transparent;
      color: rgba(255,255,255,0.85);
      padding: 10px 18px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      transition: background var(--transition), color var(--transition);
      text-decoration: none;
      font-size: 0.95rem;
    }
    
    .nav-card:hover {
      background: rgba(0,230,118,0.15);
      color: #fff;
    }
    
    .cta-nav {
      background: var(--accent-signal);
      color: var(--primary-deep) !important;
      font-weight: 600;
      margin-left: 8px;
    }
    .cta-nav:hover {
      background: #00e673;
      box-shadow: 0 0 10px rgba(0,230,118,0.5);
    }
    
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.8rem;
      cursor: pointer;
    }
    
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary-deep);
    }
    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    
    /* Hero */
    #hero {
      background-color: var(--primary-deep);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 140px 0 100px;
      color: white;
    }
    #hero::before {
      content: '';
      position: absolute;
      top:0;left:0;right:0;bottom:0;
      background: rgba(26,29,35,0.75);
    }
    .hero-content {
      position: relative;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero-text h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero-text .highlight {
      color: var(--accent-signal);
    }
    .hero-stats {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      margin: 30px 0;
    }
    .stat-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-card);
      padding: 16px 20px;
      color: white;
      min-width: 130px;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      font-variant-numeric: tabular-nums;
      color: var(--accent-signal);
    }
    .btn-primary {
      background: var(--accent-signal);
      color: var(--primary-deep);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #00e673;
      box-shadow: 0 0 14px rgba(0,230,118,0.5);
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      margin-left: 16px;
      font-weight: 600;
    }
    
    /* 指标看板 */
    .dashboard-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .dash-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }
    .dash-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .dash-icon {
      font-size: 2.2rem;
      color: var(--accent-signal);
      margin-bottom: 15px;
    }
    .dash-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary-deep);
    }
    
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .service-img {
      height: 200px;
      background-size: cover;
    }
    .service-body {
      padding: 24px;
    }
    .tag {
      background: #eef2f6;
      color: var(--primary-deep);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      margin-right: 8px;
    }
    
    /* 对比区 */
    .compare-row {
      display: flex;
      gap: 24px;
    }
    .compare-col {
      flex:1;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .old-col {
      background: #f0f2f5;
    }
    .check-green {
      color: var(--accent-signal);
    }
    .cross-red {
      color: #cc3b3b;
    }
    
    /* FAQ */
    .accordion-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .accordion-title {
      padding: 20px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    
    /* 表单 */
    .contact-form input, .contact-form textarea {
      border-radius: 8px;
      border: 1px solid var(--border-light);
      padding: 12px;
    }
    
    footer {
      background: var(--primary-deep);
      color: #ccc;
      padding: 60px 0 30px;
    }
    
    @media (max-width: 1024px) {
      .dashboard-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 640px) {
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .dashboard-grid, .services-grid { grid-template-columns: 1fr; }
      .compare-row { flex-direction: column; }
      .hero-text h1 { font-size: 2rem; }
    }