/* roulang page: index */
:root {
      --primary: #00E5FF;
      --primary-dark: #00B8D4;
      --accent: #7C4DFF;
      --bg-deep: #0A0E27;
      --bg-card: rgba(255, 255, 255, 0.04);
      --border-card: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(0, 229, 255, 0.4);
      --text-primary: #F0F2FA;
      --text-secondary: #A0AEC0;
      --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
      --shadow-hover: 0 8px 40px rgba(0, 229, 255, 0.2);
      --border-radius-card: 20px;
      --border-radius-btn: 12px;
      --border-radius-input: 12px;
      --border-radius-badge: 50px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: 'Inter', 'Roboto', sans-serif;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      padding: 0;
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-heading);
      line-height: 1.7;
      font-weight: 400;
      overflow-x: hidden;
    }
    
    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: var(--bg-deep);
    }
    ::-webkit-scrollbar-thumb {
      background: var(--primary);
      border-radius: 10px;
    }
    
    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.3s ease;
    }
    a:hover {
      color: var(--primary-dark);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 导航栏固定顶部玻璃效果 */
    .navbar-custom {
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
      z-index: 1000;
      padding: 0;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    
    .brand-logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.02em;
      color: var(--primary);
      text-shadow: 0 0 12px rgba(0,229,255,0.5);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .brand-logo i {
      font-size: 2rem;
      color: var(--accent);
      text-shadow: 0 0 10px var(--accent);
    }
    
    .nav-tabs-row {
      background: transparent;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
      -ms-overflow-style: none;
      border-bottom: none;
    }
    .nav-tabs-row::-webkit-scrollbar {
      display: none;
    }
    
    .nav-pill {
      display: inline-block;
      padding: 10px 22px;
      margin: 0 6px;
      background: rgba(255,255,255,0.05);
      color: var(--text-secondary);
      border-radius: var(--border-radius-badge);
      font-weight: 600;
      font-size: 0.95rem;
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }
    .nav-pill:hover {
      background: rgba(0,229,255,0.1);
      color: var(--primary);
      border-color: rgba(0,229,255,0.3);
    }
    .nav-pill.active {
      background: rgba(0,229,255,0.15);
      color: var(--primary);
      border-bottom: 2px solid var(--primary);
      box-shadow: 0 0 16px rgba(0,229,255,0.3);
    }
    
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      border-radius: var(--border-radius-btn);
      padding: 12px 28px;
      box-shadow: 0 0 16px rgba(0,229,255,0.3);
      transition: all 0.3s ease;
      letter-spacing: 0.5px;
    }
    .btn-primary-custom:hover {
      background: var(--primary-dark);
      box-shadow: 0 0 28px rgba(0,229,255,0.6);
      color: #0A0E27;
    }
    
    .btn-outline-custom {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-weight: 700;
      border-radius: var(--border-radius-btn);
      padding: 12px 28px;
      transition: all 0.3s ease;
    }
    .btn-outline-custom:hover {
      background: rgba(0,229,255,0.1);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
      box-shadow: 0 0 20px rgba(0,229,255,0.4);
    }
    
    .glass-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid var(--border-card);
      border-radius: var(--border-radius-card);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    .section-padding {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 60px 0;
      }
    }
    
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 576px) {
      .container-custom {
        padding: 0 16px;
      }
    }
    
    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    
    .text-glow {
      text-shadow: 0 0 20px rgba(0,229,255,0.7);
    }
    
    .hero-title {
      font-size: 4rem;
      font-weight: 800;
      color: var(--text-primary);
      text-shadow: 0 0 30px rgba(0,229,255,0.8);
    }
    @media (max-width: 576px) {
      .hero-title {
        font-size: 2.2rem;
      }
    }
    
    .data-number {
      font-family: var(--font-number);
      font-weight: 800;
      font-size: 3rem;
      color: var(--primary);
      text-shadow: 0 0 24px rgba(0,229,255,0.6);
    }
    
    .accent-badge {
      background: var(--accent);
      color: white;
      border-radius: var(--border-radius-badge);
      padding: 4px 16px;
      font-weight: 700;
      font-size: 0.8rem;
      display: inline-block;
    }
    
    .form-control-custom {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: var(--border-radius-input);
      color: white;
      padding: 14px 18px;
      transition: 0.3s;
    }
    .form-control-custom:focus {
      border-color: var(--primary);
      box-shadow: 0 0 18px rgba(0,229,255,0.4);
      background: rgba(255,255,255,0.08);
      color: white;
    }
    
    .accordion-button-custom {
      background: transparent;
      color: var(--text-primary);
      font-weight: 600;
      border: none;
      padding: 20px 0;
    }
    
    footer {
      background: #060918;
      color: var(--text-secondary);
    }
    
    .hero-background {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1040 50%, #0A0E27 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-background::before {
      content: "";
      position: absolute;
      top:0; left:0; width:100%; height:100%;
      background-image: 
        repeating-linear-gradient(0deg, rgba(0,229,255,0.03) 0px, rgba(0,229,255,0.03) 2px, transparent 2px, transparent 40px),
        repeating-linear-gradient(90deg, rgba(0,229,255,0.03) 0px, rgba(0,229,255,0.03) 2px, transparent 2px, transparent 40px);
      pointer-events: none;
    }
    
    .compare-vs {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      text-shadow: 0 0 30px var(--primary);
    }