/* roulang page: index */
/* 设计变量与全局重置 */
    :root {
      --primary-cyan: #00E5FF;
      --primary-purple: #B44CFF;
      --energy-orange: #FF6B35;
      --success-green: #00F0A8;
      --deep-blue: #0A0E27;
      --dark-surface: #141832;
      --glass-bg: rgba(20, 30, 60, 0.65);
      --glass-border: rgba(0, 229, 255, 0.2);
      --text-primary: #F0F4FF;
      --text-secondary: #B0C0E0;
      --text-muted: #6B7A9E;
      --shadow-glow: 0 0 20px rgba(0, 229, 255, 0.5);
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --radius-lg: 16px;
      --radius-md: 12px;
      --font-sans: 'PingFang SC', 'Source Han Sans CN', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      background-color: var(--deep-blue);
    }
    
    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #1a1f3a 0%, #0A0E27 70%);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    /* 自定义容器 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    
    @media (max-width: 768px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card), inset 0 0 20px rgba(255,255,255,0.03);
      transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
    }
    
    .glass-card:hover {
      transform: scale(1.02);
      border-color: rgba(0, 229, 255, 0.5);
      box-shadow: 0 10px 40px rgba(0,0,0,0.5), 0 0 25px rgba(0, 229, 255, 0.25);
    }
    
    /* 发光按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #00E5FF 0%, #0099CC 100%);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 40px;
      font-size: 1rem;
      letter-spacing: 0.5px;
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.55);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      cursor: pointer;
    }
    
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0, 229, 255, 0.8);
      transform: translateY(-2px);
      color: #000;
    }
    
    .btn-ghost {
      background: transparent;
      border: 1.5px solid var(--primary-cyan);
      color: var(--primary-cyan);
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 40px;
      font-size: 1rem;
      backdrop-filter: blur(8px);
      transition: all 0.3s ease;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    
    .btn-ghost:hover {
      background: rgba(0, 229, 255, 0.15);
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
      transform: translateY(-2px);
    }
    
    /* 导航样式 */
    .navbar {
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
      backdrop-filter: blur(0px);
    }
    
    .navbar.scrolled {
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(20px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    }
    
    .nav-link {
      color: var(--primary-cyan);
      font-weight: 500;
      position: relative;
      transition: color 0.2s;
    }
    
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-cyan);
      box-shadow: 0 0 12px var(--primary-cyan);
      transition: width 0.25s ease;
    }
    
    .nav-link:hover::after {
      width: 100%;
    }
    
    /* 移动端菜单 */
    .mobile-menu {
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(24px);
    }
    
    /* 数据看板数字动画 */
    .counter {
      font-variant-numeric: tabular-nums;
      font-weight: 700;
      color: var(--primary-cyan);
    }
    
    /* 背景粒子模拟 */
    .hero-bg-particles {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background-image: radial-gradient(circle at 30% 40%, rgba(0,229,255,0.08) 1px, transparent 1px),
                        radial-gradient(circle at 70% 60%, rgba(180,76,255,0.1) 1px, transparent 1px);
      background-size: 60px 60px, 80px 80px;
      pointer-events: none;
    }
    
    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #0A0E27;
    }
    ::-webkit-scrollbar-thumb {
      background: #00E5FF;
      border-radius: 10px;
    }