:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-card: #242b3d;
    --text-primary: #e8eaed;
    --text-secondary: #9aa0a6;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #10b981;
    --danger: #ef4444;
    --border: #374151;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 40px 20px;
    background: var(--bg-secondary);
    border-radius: 12px;
    margin-bottom: 30px;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--accent) 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.info-panel {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border-left: 4px solid var(--accent);
}

.info-panel h3 {
    margin-bottom: 10px;
    color: var(--accent);
}

.controls {
    display: flex;
    gap: 12px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--accent);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    opacity: 0.9;
}

.apartments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.apartment-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 20px;
    border: 2px solid var(--border);
    transition: all 0.3s ease;
}

.apartment-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(59, 130, 246, 0.2);
}

.apartment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.apartment-name {
    font-size: 1.3rem;
    font-weight: 700;
}

.remove-btn {
    background: var(--danger);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

.remove-btn:hover {
    opacity: 0.8;
}

.score-display {
    background: var(--bg-secondary);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 16px;
    text-align: center;
}

.score-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--success);
}

.score-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.feature-group {
    margin-bottom: 12px;
}

.feature-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.feature-value {
    color: var(--accent);
    font-weight: 600;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-secondary);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: none;
}

.visualizations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.chart-container {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.chart-container h3 {
    margin-bottom: 20px;
    color: var(--accent);
}

canvas {
    max-height: 400px;
}

.ranking {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: 12px;
    margin-bottom: 30px;
}

.ranking h3 {
    margin-bottom: 20px;
    color: var(--accent);
}

.ranking-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background: var(--bg-card);
    border-radius: 8px;
    margin-bottom: 12px;
    border-left: 4px solid var(--accent);
}

.ranking-position {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--accent);
    min-width: 40px;
}

.ranking-name {
    flex: 1;
    font-size: 1.1rem;
    font-weight: 600;
    margin-left: 16px;
}

.ranking-score {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--success);
}

footer {
    text-align: center;
    padding: 30px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}

footer a {
    color: var(--accent);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Mobile responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 1.8rem;
    }
    
    .visualizations {
        grid-template-columns: 1fr;
    }
    
    .chart-container {
        min-width: 100%;
    }
    
    .apartments-grid {
        grid-template-columns: 1fr;
    }
    
    .controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}