:root {
    --bg-color: #0a0a0a;
    --text-color: #ffffff;
    --primary-color: #3b82f6;
    --secondary-color: #64748b;
    --glass-bg: rgba(20, 20, 20, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --accent-color: #8b5cf6;
}

body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
}

.ui-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    width: 320px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.ui-overlay::-webkit-scrollbar {
    width: 8px;
}

.ui-overlay::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

.ui-overlay::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
}

.ui-overlay::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

h1 {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0 0 20px 0;
    opacity: 0.9;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

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

label {
    font-size: 0.85rem;
    color: var(--secondary-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Toggle Switch */
.toggle-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    gap: 12px;
}

.toggle-label input[type="checkbox"] {
    appearance: none;
    width: 48px;
    height: 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    position: relative;
    cursor: pointer;
    transition: background 0.3s ease;
}

.toggle-label input[type="checkbox"]:checked {
    background: var(--primary-color);
}

.toggle-label input[type="checkbox"]::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    top: 3px;
    left: 3px;
    transition: transform 0.3s ease;
}

.toggle-label input[type="checkbox"]:checked::before {
    transform: translateX(24px);
}

.toggle-label span {
    color: var(--text-color);
    font-size: 0.9rem;
}

/* Collapsible Sections */
.param-section {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    padding: 12px;
    border: 1px solid var(--glass-border);
}

.param-section summary {
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-color);
    list-style: none;
    user-select: none;
}

.param-section summary::-webkit-details-marker {
    display: none;
}

.param-section summary::before {
    content: '▶';
    display: inline-block;
    margin-right: 8px;
    transition: transform 0.3s ease;
    font-size: 0.7rem;
}

.param-section[open] summary::before {
    transform: rotate(90deg);
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
}

/* Range Sliders */
input[type="range"] {
    width: 100%;
    height: 4px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
    -webkit-appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: #2563eb;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
    background: #2563eb;
}

select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 8px 12px;
    border-radius: 8px;
    outline: none;
    font-family: inherit;
    cursor: pointer;
}

select:hover {
    background: rgba(255, 255, 255, 0.1);
}

button {
    padding: 10px 16px;
    border-radius: 8px;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

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

.primary-btn:hover {
    background: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.render-btn {
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: white;
    font-size: 0.95rem;
}

.render-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

.secondary-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.15);
}

.render-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.status {
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--secondary-color);
}

.progress-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    margin-top: 8px;
    overflow: hidden;
}

#progressFill {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}