/* roulang page: index */
:root {
            --bg-color: #0A0A0B;
            --primary: #00F2FF;
            --secondary: #7B2CBF;
            --text-main: #E2E8F0;
            --text-dim: #94A3B8;
            --border-color: #1E293B;
            --card-bg: #111827;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background-color: var(--bg-color); color: var(--text-main); line-height: 1.6; }
        
        .container { max-width: 1280px; margin: 0 auto; padding: 0 1.5rem; }
        
        header { border-bottom: 1px solid var(--border-color); padding: 1rem 0; position: sticky; top: 0; z-index: 1000; background: rgba(10, 10, 11, 0.8); backdrop-filter: blur(10px); }
        .nav-inner { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 1.25rem; font-weight: 700; color: var(--primary); text-decoration: none; display: flex; align-items: center; gap: 0.5rem; }
        .nav-links a { color: var(--text-main); text-decoration: none; margin-left: 2rem; font-size: 0.9rem; transition: color 0.3s; }
        .nav-links a:hover { color: var(--primary); }

        .btn { padding: 0.75rem 1.5rem; border-radius: 0.5rem; font-weight: 600; cursor: pointer; transition: all 0.3s; border: 1px solid transparent; display: inline-flex; align-items: center; justify-content: center; }
        .btn-primary { background: var(--primary); color: #000; }
        .btn-primary:hover { box-shadow: 0 0 15px rgba(0, 242, 255, 0.4); transform: translateY(-2px); }
        .btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
        .btn-outline:hover { background: rgba(0, 242, 255, 0.1); }

        .hero { padding: 4rem 0; text-align: center; background: radial-gradient(circle at center, rgba(123, 44, 191, 0.15) 0%, rgba(10, 10, 11, 0) 70%); }
        .hero h1 { font-size: 3.5rem; margin-bottom: 1.5rem; line-height: 1.2; background: linear-gradient(to right, #fff, #00F2FF); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .hero p { font-size: 1.2rem; color: var(--text-dim); max-width: 800px; margin: 0 auto 2.5rem; }

        section { padding: 5rem 0; }
        .section-title { font-size: 2.5rem; text-align: center; margin-bottom: 3rem; }
        
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
        .card { background: var(--card-bg); padding: 2rem; border-radius: 1rem; border: 1px solid var(--border-color); transition: all 0.3s; }
        .card:hover { border-color: var(--primary); transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.3); }
        .card h3 { font-size: 1.5rem; margin-bottom: 1rem; color: var(--primary); }
        
        .footer { background: #050505; border-top: 1px solid var(--border-color); padding: 3rem 0; text-align: center; color: var(--text-dim); font-size: 0.85rem; }
        
        @media (max-width: 768px) {
            .hero h1 { font-size: 2.5rem; }
            .nav-links { display: none; }
        }