/* roulang page: index */
:root {
            --primary-blue: #007AFF;
            --dark-blue: #0A2540;
            --light-blue: #E1F0FF;
            --text-main: #333;
            --text-muted: #666;
            --bg-gray: #F8F9FA;
            --white: #ffffff;
            --radius: 8px;
            --shadow: 0 4px 12px rgba(0,0,0,0.08);
            --transition: all 0.3s ease;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif; line-height: 1.6; color: var(--text-main); background-color: var(--white); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        
        /* Header */
        header { padding: 20px 0; background: var(--white); position: sticky; top: 0; z-index: 1000; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
        nav { display: flex; align-items: center; justify-content: space-between; }
        .logo { font-size: 20px; font-weight: 700; color: var(--dark-blue); text-decoration: none; }
        .nav-links { display: flex; gap: 30px; }
        .nav-links a { text-decoration: none; color: var(--text-main); font-weight: 500; font-size: 15px; transition: var(--transition); }
        .nav-links a:hover { color: var(--primary-blue); }
        .cta-btn { background: var(--primary-blue); color: var(--white); padding: 10px 20px; border-radius: var(--radius); text-decoration: none; font-weight: 600; }

        /* Hero */
        .hero { position: relative; padding: 100px 0; background: linear-gradient(135deg, var(--dark-blue), #1a4a7a); color: var(--white); }
        .hero-content { max-width: 700px; }
        .hero h1 { font-size: 48px; margin-bottom: 20px; line-height: 1.2; }
        .hero p { font-size: 18px; margin-bottom: 30px; opacity: 0.9; }

        /* Sections */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 50px; font-size: 36px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { padding: 30px; background: var(--bg-gray); border-radius: var(--radius); transition: var(--transition); }
        .card:hover { box-shadow: var(--shadow); transform: translateY(-5px); background: var(--white); }
        
        /* Buttons/Components */
        .btn-primary { display: inline-block; padding: 12px 28px; background: var(--primary-blue); color: #fff; border-radius: var(--radius); text-decoration: none; font-weight: 600; }
        .icon-box { margin-bottom: 20px; width: 50px; height: 50px; background: var(--light-blue); color: var(--primary-blue); display: flex; align-items: center; justify-content: center; border-radius: var(--radius); font-size: 24px; }

        /* Responsive */
        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: 1fr; }
            .hero h1 { font-size: 32px; }
            .nav-links { display: none; }
        }

        footer { background: var(--dark-blue); color: #fff; padding: 50px 0; text-align: center; }