/* roulang page: index */
:root {
            --primary: #10b981;
            --dark: #0f172a;
            --text-main: #334155;
            --text-light: #64748b;
            --bg-gray: #f8fafc;
            --white: #ffffff;
            --radius: 8px;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; line-height: 1.75; color: var(--text-main); background-color: var(--white); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header */
        header { background: var(--dark); color: var(--white); padding: 1rem 0; position: sticky; top: 0; z-index: 1000; }
        .nav-inner { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 1.5rem; font-weight: 700; color: var(--primary); text-decoration: none; }
        .nav-links a { color: var(--white); text-decoration: none; margin-left: 2rem; font-size: 0.95rem; opacity: 0.8; transition: 0.3s; }
        .nav-links a:hover { opacity: 1; color: var(--primary); }

        /* Hero */
        .hero { padding: 100px 0; background: linear-gradient(135deg, var(--dark) 0%, #1e293b 100%); color: var(--white); text-align: center; }
        .hero h1 { font-size: 3rem; margin-bottom: 1.5rem; }
        .hero p { max-width: 800px; margin: 0 auto 2rem; font-size: 1.2rem; opacity: 0.9; }
        .btn-primary { display: inline-block; padding: 12px 30px; background: var(--primary); color: var(--white); border-radius: var(--radius); text-decoration: none; font-weight: 600; transition: 0.3s; }
        .btn-primary:hover { background: #059669; }

        /* Sections */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 50px; }
        .section-title h2 { font-size: 2rem; color: var(--dark); margin-bottom: 15px; }
        
        /* Grid */
        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .card { background: var(--white); border: 1px solid #e2e8f0; border-radius: var(--radius); padding: 30px; transition: 0.3s; }
        .card:hover { box-shadow: 0 10px 20px rgba(0,0,0,0.05); }

        /* Footer */
        footer { background: var(--dark); color: #94a3b8; padding: 50px 0; text-align: center; font-size: 0.9rem; }
        .footer-links a { color: #94a3b8; text-decoration: none; margin: 0 10px; }