/* roulang page: index */
:root {
            --primary-color: #0057FF; /* 活力电光蓝 */
            --accent-color: #CCFF00; /* 高能荧光绿 */
            --bg-dark: #121212;
            --text-main: #FFFFFF;
            --text-sub: #B0B0B0;
            --border-color: #333333;
            --container-width: 1200px;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; background-color: var(--bg-dark); color: var(--text-main); line-height: 1.6; }
        .container { max-width: var(--container-width); margin: 0 auto; padding: 0 20px; }
        
        /* Navigation */
        header { padding: 20px 0; border-bottom: 1px solid var(--border-color); background: rgba(18, 18, 18, 0.9); position: sticky; top: 0; z-index: 1000; }
        nav { display: flex; justify-content: space-between; align-items: center; }
        .logo { font-size: 24px; font-weight: 800; color: var(--primary-color); text-decoration: none; }
        .nav-links a { color: var(--text-main); text-decoration: none; margin-left: 30px; font-weight: 500; transition: color 0.3s; }
        .nav-links a:hover { color: var(--accent-color); }

        /* Hero */
        .hero { height: 80vh; display: flex; align-items: center; background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('/assets/images/a587914e75fe1267.jpg') center/cover; padding: 40px 0; text-align: center; }
        .hero h1 { font-size: 64px; margin-bottom: 20px; }
        .hero p { font-size: 20px; color: var(--text-sub); margin-bottom: 40px; max-width: 800px; margin-left: auto; margin-right: auto; }
        .btn-group { display: flex; gap: 20px; justify-content: center; }
        .btn { padding: 15px 35px; text-decoration: none; font-weight: bold; transition: all 0.3s; border: 2px solid transparent; cursor: pointer; }
        .btn-primary { background-color: var(--primary-color); color: #fff; }
        .btn-primary:hover { background-color: transparent; border-color: var(--primary-color); }
        .btn-accent { background-color: var(--accent-color); color: #000; }
        .btn-accent:hover { background-color: transparent; border-color: var(--accent-color); color: var(--accent-color); }

        /* Sections */
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 60px; font-size: 40px; }
        
        /* KPI Dashboard */
        .kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
        .kpi-item { background: #1a1a1a; padding: 40px; text-align: center; border: 1px solid var(--border-color); }
        .kpi-item h3 { color: var(--accent-color); font-size: 48px; margin-bottom: 10px; }

        /* Service Grid */
        .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .card { background: #1a1a1a; padding: 30px; border: 1px solid var(--border-color); transition: transform 0.3s; }
        .card:hover { transform: translateY(-10px); border-color: var(--primary-color); }
        .card img { width: 100%; height: 200px; object-fit: cover; margin-bottom: 20px; }
        .card h3 { margin-bottom: 15px; }

        /* Result Comparison */
        .comparison-container { display: flex; gap: 40px; align-items: center; background: #000; padding: 60px; }
        .comp-box { flex: 1; }

        /* Milestone */
        .milestone { padding: 60px 0; background: var(--primary-color); color: #fff; }

        /* Footer */
        footer { padding: 40px 0; border-top: 1px solid var(--border-color); text-align: center; color: var(--text-sub); }
        
        /* Mobile */
        @media (max-width: 768px) {
            .hero h1 { font-size: 40px; }
            .kpi-grid, .service-grid { grid-template-columns: 1fr; }
            .comparison-container { flex-direction: column; }
        }