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

body {
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f5f5f5;  /* Light gray background */
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: #ffffff;  /* Pure white container */
    border-radius: 16px;
    border: 1px solid #e0e0e0;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.header {
    background: #ffffff;
    color: #000000;  /* Black text */
    padding: 30px;
    text-align: center;
    border-bottom: 1px solid #e0e0e0;
}

.header h1 {
    font-size: 2.2em;
    margin-bottom: 8px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1em;
    opacity: 0.6;
    font-weight: 400;
}

.controls {
    padding: 25px 30px;
    background: #fafafa;  /* Very light gray */
    border-bottom: 1px solid #e0e0e0;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: #666;
    font-size: 0.95em;
    letter-spacing: 0.3px;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1em;
    background: #ffffff;
    color: #333;
    transition: all 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: #999;
    background: #fff;
}

.param-hint {
    font-size: 0.75em;
    color: #999;
    font-style: italic;
}

/* Description box */
.description-box {
    background: #f8f8f8;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 10px 14px;
    margin-bottom: 12px;
    font-size: 0.85em;
    color: #666;
    line-height: 1.5;
}

.description-box strong {
    color: #333;
    font-weight: 600;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 0.95em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
    min-width: 120px;
    background: #ffffff;
    color: #333;
}

.btn:hover:not(:disabled) {
    background: #f5f5f5;
    border-color: #999;
    transform: translateY(-1px);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-primary {
    background: #000;  /* Black primary button */
    color: #fff;
    border-color: #000;
}

.btn-primary:hover:not(:disabled) {
    background: #333;
    border-color: #333;
}

.btn-secondary {
    background: #666;
    color: #fff;
    border-color: #666;
}

.btn-danger {
    background: #fff;
    border-color: #ddd;
    color: #d33;
}

.btn-danger:hover:not(:disabled) {
    background: #fee;
    border-color: #d33;
}

.btn-warning {
    background: #fff;
    border-color: #ddd;
    color: #f90;
}

.btn-warning:hover:not(:disabled) {
    background: #fff5e6;
    border-color: #f90;
}

.btn-success {
    background: #fff;
    border-color: #ddd;
    color: #0a0;
}

.btn-success:hover:not(:disabled) {
    background: #e6ffe6;
    border-color: #0a0;
}

.status-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 12px;
    background: #ffffff;
    padding: 16px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    margin-bottom: 15px;
}

.status-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.status-label {
    font-size: 0.8em;
    color: #999;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.status-value {
    font-size: 1.4em;
    font-weight: 600;
    color: #000;
    font-variant-numeric: tabular-nums;
}

#canvas-container {
    width: 100%;
    height: 600px;
    background: #ffffff;  /* White background */
    position: relative;
    overflow: hidden;
    border-top: 1px solid #e0e0e0;
    border-bottom: 1px solid #e0e0e0;
}

#renderCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

.info {
    padding: 20px 30px;
    background: #fafafa;
    border-top: 1px solid #e0e0e0;
}

.note {
    padding: 12px 16px;
    background: #fff;
    border-left: 3px solid #666;
    border-radius: 4px;
    color: #666;
    font-size: 0.9em;
    margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8em;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    #canvas-container {
        height: 400px;
    }
}

/* Conflict Warning */
.conflict-warning {
    background: #fff3cd;
    border: 2px solid #ffc107;
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    text-align: center;
}

.conflict-warning p {
    margin: 10px 0;
    color: #856404;
}

.conflict-warning strong {
    font-size: 1.1em;
}

.conflict-warning button {
    margin: 10px 5px 0;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #000;
    cursor: pointer;
    transition: all 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: #333;
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #000;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    background: #333;
}

/* Config Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: #fff;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid #e0e0e0;
}

.modal-header h2 {
    font-size: 1.3em;
    font-weight: 600;
    color: #333;
    margin: 0;
}

.modal-body {
    padding: 20px 24px;
}

.config-section {
    margin-bottom: 20px;
}

.config-section:last-child {
    margin-bottom: 0;
}

.config-section h3 {
    font-size: 0.9em;
    font-weight: 600;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid #eee;
}

.config-field {
    margin-bottom: 12px;
}

.config-field label {
    display: block;
    font-size: 0.85em;
    font-weight: 500;
    color: #666;
    margin-bottom: 4px;
}

.config-field input[type="number"],
.config-field input[type="text"],
.config-field select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 0.95em;
    background: #fff;
    color: #333;
}

.config-field input:focus,
.config-field select:focus {
    outline: none;
    border-color: #999;
}

.config-field .slider-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.config-field .slider-container input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
}

.config-field .slider-value {
    min-width: 50px;
    font-weight: 600;
    color: #000;
    font-size: 0.95em;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid #e0e0e0;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-footer .btn {
    flex: 0;
    min-width: 140px;
}