.settings-panel {
    position: fixed;
    left: 0;
    top: 0;
    width: 400px;
    height: 100%;
    background: var(--panel-bg);
    border-right: 1px solid var(--border-color);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 150;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.settings-panel.open {
    transform: translateX(0);
}

.settings-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

.settings-header h2 {
    font-size: 16px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0;
}

.settings-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.settings-section {
    margin-bottom: 24px;
}

.settings-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    cursor: pointer;
    user-select: none;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.settings-section-title {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.settings-section-toggle {
    font-size: 12px;
    opacity: 0.5;
    transition: transform 0.2s ease;
}

.settings-section.collapsed .settings-section-toggle {
    transform: rotate(-90deg);
}

.settings-section-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.settings-section.collapsed .settings-section-content {
    display: none;
}

/* Compact Surface Grid */
.surfaces-grid {
    display: grid;
    grid-template-areas:
        "front ceiling back"
        "left floor right";
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
}

.surface-card[data-surface="front"] { grid-area: front; }
.surface-card[data-surface="ceiling"] { grid-area: ceiling; }
.surface-card[data-surface="back"] { grid-area: back; }
.surface-card[data-surface="left"] { grid-area: right; } /* swap positions */
.surface-card[data-surface="floor"] { grid-area: floor; }
.surface-card[data-surface="right"] { grid-area: left; } /* swap positions */

.surface-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all 0.2s ease;
}

.surface-card:hover {
    border-color: var(--accent-color);
}

.surface-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.surface-name {
    font-size: 11px;
    font-weight: 700;
    text-transform: capitalize;
}

.surface-visibility-toggle {
    width: 20px;
    height: 20px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    transition: all 0.2s ease;
}

.surface-visibility-toggle.visible {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.surface-color-picker {
    width: 100%;
    height: 30px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: transform 0.2s ease;
    position: relative;
    overflow: hidden;
}

.surface-color-picker:hover {
    transform: scale(1.05);
}

.surface-color-input {
    opacity: 0;
    position: absolute;
    pointer-events: none;
}

.control-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.control-label {
    font-size: 11px;
    opacity: 0.7;
    flex: 1;
}

.select-input {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 8px;
    color: var(--text-color);
    font-family: 'Space Mono', monospace;
    font-size: 11px;
    cursor: pointer;
}

.select-input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.slider-input {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    outline: none;
}

.slider-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.1s ease;
}

.slider-input::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider-input::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: transform 0.1s ease;
}

.slider-input::-moz-range-thumb:hover {
    transform: scale(1.2);
}

.slider-value {
    min-width: 40px;
    text-align: right;
    font-size: 11px;
    opacity: 0.7;
}

.environment-presets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.environment-preset {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    text-align: center;
}

.environment-preset:hover {
    background: var(--hover-bg);
    border-color: var(--accent-color);
}

.environment-preset.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

.preset-icon {
    font-size: 24px;
}

.preset-name {
    font-size: 11px;
    font-weight: 700;
}

.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
}

.color-preview {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.color-preview:hover {
    transform: scale(1.1);
}

.color-input {
    opacity: 0;
    position: absolute;
    pointer-events: none;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.7;
}

.skybox-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.skybox-option {
    background: var(--panel-bg);
    border: 2px solid transparent;
    border-radius: 8px;
    padding: 0;
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    overflow: hidden;
    line-height: 0;
}

.skybox-option:hover {
    border-color: var(--accent-color);
}

.skybox-option.active {
    border-color: var(--accent-color);
    box-shadow: 0 0 8px rgba(232, 155, 111, 0.5);
}

.skybox-thumbnail {
    width: 100%;
    height: auto;
    display: block;
}

.skybox-flat-color {
    width: 100%;
    aspect-ratio: 2 / 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    background: var(--bg-color);
    transition: background-color 0.3s ease;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.skybox-icon {
    font-size: 24px;
    line-height: 1;
}

.skybox-name {
    font-size: 11px;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-color);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.1);
    transition: 0.3s;
    border-radius: 24px;
    border: 1px solid var(--border-color);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

.toggle-slider:hover {
    border-color: var(--accent-color);
}