/* Gravity Well Simulator Styles */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #0a0a14 0%, #1a1a2e 100%);
    color: #e0e0e0;
    min-height: 100vh;
    padding-top: 50px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, #00d9ff, #7b2cbf);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #888;
    font-size: 1.1rem;
}

.main-content {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
}

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

.canvas-container {
    position: relative;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    overflow: hidden;
}

#gravityCanvas {
    width: 100%;
    height: 600px;
    display: block;
    cursor: crosshair;
}

.stats-overlay {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    gap: 1rem;
}

.stat-item {
    background: rgba(0, 0, 0, 0.8);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-label {
    color: #888;
    font-size: 0.8rem;
}

.stat-value {
    color: #00d9ff;
    font-family: monospace;
    margin-left: 0.5rem;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-section {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid #333;
    border-radius: 8px;
    padding: 1.25rem;
}

.control-section h3 {
    color: #00d9ff;
    font-size: 1rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #333;
}

.button-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid #333;
    color: #888;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
}

.btn:hover {
    border-color: #00d9ff;
    color: #00d9ff;
}

.btn-primary {
    background: linear-gradient(90deg, #00ff88, #00d9ff);
    color: #0a0a0f;
    border-color: transparent;
}

.btn-primary:hover {
    opacity: 0.9;
    color: #0a0a0f;
}

.preset-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.preset-btn.active {
    background: rgba(0, 217, 255, 0.2);
    border-color: #00d9ff;
    color: #00d9ff;
}

.control {
    margin-bottom: 0.75rem;
}

.control:last-child {
    margin-bottom: 0;
}

.control label {
    display: block;
    color: #ccc;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.control input[type="range"] {
    width: 100%;
    accent-color: #00d9ff;
}

.control input[type="checkbox"] {
    accent-color: #00d9ff;
    margin-right: 0.5rem;
}

.help-text {
    color: #888;
    font-size: 0.8rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}