/* roulang page: index */
:root {
            --primary: #0F1D36;
            --accent: #0EA5E9;
            --bg-light: #F8FAFC;
            --bg-dark: #0B1120;
            --text-dark: #1E293B;
            --text-muted: #64748B;
            --border-color: rgba(15, 29, 54, 0.08);
        }
        * {
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }
        body {
            font-family: var(--font-sans, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif);
            color: var(--text-dark);
            background-color: var(--bg-light);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            letter-spacing: -0.02em;
            line-height: 1.3;
        }
        .custom-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            box-shadow: 0 1px 3px rgba(0,0,0,0.04);
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -6px rgba(15, 29, 54, 0.09);
            border-color: rgba(14, 165, 233, 0.3);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            background-color: #0EA5E9;
            color: #ffffff;
            font-weight: 500;
            padding: 0.75rem 1.75rem;
            min-height: 44px;
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .btn-primary:hover {
            background-color: #0284C7;
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 6px;
            border: 1px solid #CBD5E1;
            background: #FFFFFF;
            color: #1E293B;
            font-weight: 500;
            padding: 0.75rem 1.75rem;
            min-height: 44px;
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .btn-outline:hover {
            border-color: #0EA5E9;
            color: #0EA5E9;
            background: #F0F9FF;
        }
        .nav-blur {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }