:root {
    --bg-dark: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.8);
    --accent: #38bdf8;
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --input-bg: #1e293b;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
}

#app {
    display: flex;
    height: 100%;
}

.controls-panel {
    width: 360px;
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    border-right: 1px solid var(--border);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    overflow-y: auto;
    z-index: 10;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.control-group h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header h3 {
    margin-bottom: 0;
}

.btn-icon {
    background: var(--input-bg);
    color: var(--accent);
    border: 1px solid var(--border);
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.25rem;
    transition: all 0.2s;
}

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

.color-list {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.color-item {
    position: relative;
    width: 3.5rem;
    height: 3.5rem;
}

.color-preview {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 2px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
}

.color-item input[type="color"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.remove-color {
    position: absolute;
    top: -5px;
    right: -5px;
    width: 20px;
    height: 20px;
    background: #ef4444;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    cursor: pointer;
    border: 2px solid var(--bg-dark);
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 5;
}

.color-item:hover .remove-color {
    opacity: 1;
}

.resolution-presets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.res-preset {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.res-preset:hover {
    border-color: var(--accent);
    color: var(--text);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #app {
        flex-direction: column;
        overflow-y: auto;
    }

    .controls-panel {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding: 1.5rem;
    }

    .preview-container {
        padding: 1.5rem;
        min-height: 400px;
    }
}

.control-item {
    margin-bottom: 1.25rem;
}

.control-item label {
    display: block;
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

input[type="range"] {
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    appearance: none;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.dimension-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dimension-inputs input {
    flex: 1;
    min-width: 0;
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

.dimension-inputs .btn-icon {
    flex-shrink: 0;
    font-size: 1rem;
}

.preset-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.preset-card {
    aspect-ratio: 16/9;
    border-radius: 4px;
    border: 1px solid var(--border);
    cursor: pointer;
    overflow: hidden;
    transition: border-color 0.2s;
}

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

.btn-primary, .btn-secondary {
    width: 100%;
    padding: 0.75rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
    border: none;
}

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

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

.btn-primary:hover, .btn-secondary:hover {
    opacity: 0.9;
}

.preview-container {
    flex: 1;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
}

.canvas-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

#gl-canvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    background: #000;
}