:root {
    --bg-color: #050510;
    --panel-bg: rgba(20, 25, 40, 0.75);
    --text-color: #ffffff;
    --accent-color: #4da6ff;
    --accent-hover: #73c2ff;
    --border-color: rgba(255, 255, 255, 0.1);
    --font-family: system-ui, -apple-system, sans-serif;
}

body {
    margin: 0;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    user-select: none;
}

#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
}

/* UI Sidebar */
#ui-sidebar {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 320px;
    max-height: calc(100vh - 40px);
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    overflow-y: auto;
    z-index: 10;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Scrollbar */
#ui-sidebar::-webkit-scrollbar {
    width: 6px;
}
#ui-sidebar::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,0.2);
    border-radius: 3px;
}

h1 {
    font-size: 1.5rem;
    margin: 0 0 5px 0;
    font-weight: 600;
}

.subtitle {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    margin: 0 0 20px 0;
}

.panel {
    margin-bottom: 24px;
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

h2 {
    font-size: 1rem;
    margin: 0 0 12px 0;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Controls */
.file-input-wrapper {
    margin-bottom: 8px;
}

.file-input-wrapper input[type="file"] {
    display: none;
}

.btn {
    display: block;
    width: 100%;
    box-sizing: border-box; /* Ensure padding doesn't affect total width */
    padding: 10px;
    background: var(--accent-color);
    color: #fff;
    text-align: center;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s;
}

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

#file-status {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    margin: 0;
    text-align: center;
}

/* Sliders */
.control-group {
    margin-bottom: 12px;
}

.control-group label {
    display: block;
    font-size: 0.85rem;
    margin-bottom: 4px;
    color: rgba(255, 255, 255, 0.8);
}

.control-group input[type="range"] {
    width: 100%;
    margin: 0 0 4px 0;
    accent-color: var(--accent-color);
}

.control-group span {
    display: block;
    font-size: 0.8rem;
    text-align: right;
    color: var(--accent-color);
    font-variant-numeric: tabular-nums;
}

/* Toggles */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toggle {
    display: flex;
    align-items: center;
    cursor: pointer;
    gap: 10px;
}

.toggle input {
    display: none;
}

.toggle .slider {
    width: 40px;
    height: 20px;
    background: rgba(255,255,255,0.2);
    border-radius: 20px;
    position: relative;
    transition: background 0.3s;
}

.toggle .slider::before {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    left: 2px;
    top: 2px;
    background: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

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

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

.toggle .label {
    font-size: 0.9rem;
}

.hidden {
    display: none !important;
}