/* roulang page: index */
:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --bg-dark: #0f172a;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --shadow-soft: 0 10px 30px -5px rgba(15, 23, 42, 0.06), 0 4px 6px -2px rgba(15, 23, 42, 0.03);
    }
    
    html {
      scroll-behavior: smooth;
    }

    body {
      color: #334155;
      background-color: #ffffff;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      -webkit-font-smoothing: antialiased;
    }

    .glass-nav {
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }

    .hero-gradient {
      background: radial-gradient(circle at 80% 20%, rgba(79, 70, 229, 0.08) 0%, rgba(6, 182, 212, 0.05) 40%, rgba(248, 250, 252, 0) 70%);
    }

    .dark-card-gradient {
      background: linear-gradient(145deg, #1e293b 0%, #0f172a 100%);
    }

    .stat-number {
      font-feature-settings: "tnum";
      font-variant-numeric: tabular-nums;
    }

    .feature-card-hover {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .feature-card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 35px -10px rgba(79, 70, 229, 0.12);
      border-color: #cbd5e1;
    }

    .timeline-line::before {
      content: '';
      position: absolute;
      top: 24px;
      bottom: 24px;
      left: 20px;
      width: 2px;
      background: #e2e8f0;
      z-index: 0;
    }
    @media (min-width: 1024px) {
      .timeline-line::before {
        left: 24px;
        right: 24px;
        top: 28px;
        bottom: auto;
        width: auto;
        height: 2px;
      }
    }