/* roulang page: index */
:root {
      --primary: #00D4FF;
      --primary-glow: #00E5FF;
      --accent: #6C5CE7;
      --bg-deep: #0A0E27;
      --bg-card: #0D1B3E;
      --text-white: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #6B7FA3;
      --border-light: rgba(255, 255, 255, 0.15);
      --border-glow: rgba(0, 212, 255, 0.3);
      --glass-bg: rgba(255, 255, 255, 0.08);
      --glass-bg-hover: rgba(255, 255, 255, 0.14);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.6);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 10px;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-deep);
      color: var(--text-body);
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    .glass-card {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
    }
    .glass-card:hover {
      background: rgba(255, 255, 255, 0.14);
      border-color: rgba(255, 255, 255, 0.25);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .glass-card-static {
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-lg);
    }
    .btn-primary {
      background: #00D4FF;
      color: #0A0E27;
      font-weight: 600;
      border-radius: 12px;
      padding: 0.875rem 2rem;
      box-shadow: 0 0 20px rgba(0, 212, 255, 0.5);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background: #00e0ff;
      box-shadow: 0 0 35px rgba(0, 212, 255, 0.7);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid rgba(255, 255, 255, 0.3);
      color: white;
      font-weight: 500;
      border-radius: 12px;
      padding: 0.875rem 2rem;
      backdrop-filter: blur(8px);
      transition: all 0.25s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      border-color: rgba(255, 255, 255, 0.6);
      background: rgba(255, 255, 255, 0.05);
    }
    .text-glow {
      color: #00E5FF;
      text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      color: #00E5FF;
      margin-bottom: 0.75rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60%;
      height: 2px;
      background: linear-gradient(to right, #00E5FF, #6C5CE7);
    }
    .metric-number {
      font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
      font-weight: 700;
      font-size: 2.625rem;
      color: #00E5FF;
      text-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
    }
    .nav-link {
      color: #B0C4DE;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: white;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: #00D4FF;
    }
    input, textarea {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 10px;
      padding: 0.75rem 1rem;
      color: white;
      transition: border 0.2s, box-shadow 0.2s;
      width: 100%;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: #00D4FF;
      box-shadow: 0 0 15px rgba(0,212,255,0.3);
    }
    .mega-panel {
      position: absolute;
      top: 100%;
      right: 0;
      width: 320px;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 16px;
      padding: 1.5rem;
      display: none;
      z-index: 50;
    }
    .mega-trigger:hover .mega-panel {
      display: block;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.625rem;
      }
      .metric-number {
        font-size: 2rem;
      }
      .mega-panel {
        width: 100%;
        left: 0;
        right: auto;
      }
    }