* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 2.5em;
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.tab {
    padding: 15px 40px;
    background: #f0f0f0;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.3s;
    font-weight: 600;
}

.tab:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

.tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.chart-container {
    background: #f9f9f9;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    /* feste Mindesthöhe sorgt für konsistente Layouts */
    min-height: 420px;
}

/* Stellt sicher, dass Charts nicht breiter als ihre Container werden */
#charts { width: 100%; }
.chart-container > div { width: 100%; max-width: 100%; }

.loading {
    text-align: center;
    padding: 50px;
    font-size: 20px;
    color: #666;
}

@media (max-width: 1024px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}