* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: Arial, sans-serif; background: #f4f4f4; color: #333; }
.dashboard { max-width: 1200px; margin: 0 auto; padding: 20px; }
header { margin-bottom: 20px; }
.overview { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 30px; }
.card { background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); text-align: center; }
.chart-container { background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
@media(max-width: 768px) { .overview { grid-template-columns: 1fr; } }