.s4-container { padding: 80px 20px; max-width: 1200px; margin: 0 auto; background: #ffffff; }
.s4-title { text-align: center; font-size: 2.2rem; font-weight: 900; color: #1e293b; margin-bottom: 5px; }
.s4-subtitle { text-align: center; color: #64748b; margin-bottom: 50px; font-size: 1.1rem; }

.s4-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.s4-card {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    padding: 30px;
    border-radius: 24px;
    position: relative;
    transition: all 0.3s ease;
}

.s4-card:hover { transform: translateY(-10px); box-shadow: 0 20px 40px rgba(0,0,0,0.05); }

.leader-badge {
    background: #1e293b;
    color: white;
    padding: 5px 15px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    display: inline-block;
    margin-bottom: 15px;
}

.s4-card h4 { font-size: 1.8rem; font-weight: 800; color: #0f172a; margin-bottom: 20px; }
.chart-container { height: 250px; }