/* roulang page: index */
:root {
            --bg-dark: #050505;
            --bg-panel: #0d0d0d;
            --primary: #00ff9d;
            --secondary: #8a2be2;
            --text-main: #ffffff;
            --text-dim: #a0a0a0;
            --border: #222;
            --radius: 8px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background-color: var(--bg-dark); color: var(--text-main); line-height: 1.6; }
        
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        a { text-decoration: none; color: inherit; }
        button { cursor: pointer; border: none; outline: none; }

        /* Header */
        header { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: rgba(5, 5, 5, 0.8); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
        .top-bar { padding: 8px 0; font-size: 12px; color: var(--text-dim); display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border); }
        .nav-bar { padding: 15px 0; display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 20px; font-weight: 700; color: var(--primary); }
        .nav-links a { margin-left: 25px; font-size: 14px; color: var(--text-main); transition: var(--transition); }
        .nav-links a:hover { color: var(--primary); }
        .cta-btn { background: var(--primary); color: #000; padding: 10px 24px; border-radius: 5px; font-weight: 600; }

        /* Section Global */
        section { padding: 80px 0; }
        h2 { font-size: 36px; margin-bottom: 40px; text-align: center; }
        .section-desc { text-align: center; color: var(--text-dim); max-width: 600px; margin: 0 auto 50px; }

        /* Hero */
        .hero { height: 80vh; display: flex; align-items: center; background: linear-gradient(rgba(5,5,5,0.7), rgba(5,5,5,0.7)), url('/assets/images/418ab818b26c85ee.jpg'); background-size: cover; background-position: center; }
        .hero-content h1 { font-size: 56px; margin-bottom: 20px; line-height: 1.2; }
        .hero-content p { font-size: 18px; color: var(--text-dim); margin-bottom: 30px; max-width: 500px; }

        /* Grids & Cards */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { background: var(--bg-panel); padding: 30px; border-radius: var(--radius); border: 1px solid var(--border); transition: var(--transition); }
        .card:hover { border-color: var(--primary); transform: translateY(-5px); }

        /* Specific Blocks */
        .pain-point-row { display: flex; align-items: center; gap: 60px; }
        .step-list { display: flex; justify-content: space-between; gap: 20px; }
        .step-item { flex: 1; text-align: center; padding: 20px; }
        .step-icon { font-size: 40px; color: var(--primary); margin-bottom: 15px; }

        .stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
        .stat-num { font-size: 48px; font-weight: 800; color: var(--primary); }

        .deep-case { background: var(--bg-panel); padding: 60px; border-radius: var(--radius); }
        
        .footer { background: #000; padding: 40px 0; border-top: 1px solid var(--border); text-align: center; font-size: 14px; color: var(--text-dim); }

        /* Responsive */
        @media (max-width: 768px) {
            .grid-3, .stat-grid { grid-template-columns: 1fr; }
            .hero-content h1 { font-size: 36px; }
            .pain-point-row { flex-direction: column; }
        }