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

:root {
    --panel-width: 280px;
    --panel-collapsed-width: 44px;
    --panel-transition: 180ms ease;
}

html, body {
    width: 100%;
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #121212;
    color: #d9d9d9;
    overflow: hidden;
}

#container {
    display: flex;
    width: 100vw;
    height: 100vh;
}

#canvas {
    flex: 1;
    min-width: 0;
    min-height: 0;
    display: block;
    background: #121212;
}

#controls {
    width: var(--panel-width);
    background: #1e1e1e;
    border-left: 1px solid #333;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: width var(--panel-transition), min-width var(--panel-transition);
    min-width: var(--panel-width);
}

#controls.collapsed {
    width: var(--panel-collapsed-width);
    min-width: var(--panel-collapsed-width);
}

#controlsHeader {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 12px 12px 16px;
    border-bottom: 1px solid #333;
}

#controlsTitle {
    font-size: 16px;
    color: #d9d9d9;
    white-space: nowrap;
}

#controlsToggle {
    width: 32px;
    min-width: 32px;
    height: 32px;
    padding: 0;
    border: 1px solid #333;
    background: #2a2a2a;
    color: #d9d9d9;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
    transition: all 0.2s;
}

#controlsToggle:hover {
    background: #3a3a3a;
    border-color: #4a9eff;
}

#controlsBody {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
    opacity: 1;
    transition: opacity 120ms ease;
}

#controls.collapsed #controlsBody {
    opacity: 0;
    pointer-events: none;
}

#controls.collapsed #controlsTitle {
    display: none;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #a0a0a0;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #333;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #4a9eff;
    cursor: pointer;
    transition: background 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: #2196f3;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #4a9eff;
    cursor: pointer;
    border: none;
    transition: background 0.2s;
}

input[type="range"]::-moz-range-thumb:hover {
    background: #2196f3;
}

.value-display {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
}

.value-display strong {
    color: #4a9eff;
    font-weight: 600;
}

.button-group {
    display: flex;
    gap: 10px;
}

button {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid #333;
    background: #2a2a2a;
    color: #d9d9d9;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.2s;
}

button:hover {
    background: #3a3a3a;
    border-color: #4a9eff;
}

button:active {
    background: #1a1a1a;
}

.stats {
    padding: 12px;
    background: #252525;
    border-radius: 4px;
    border-left: 3px solid #4a9eff;
    font-size: 13px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 6px;
}

.stat-item:last-child {
    margin-bottom: 0;
}

.stat-label {
    color: #a0a0a0;
}

.stat-value {
    color: #4a9eff;
    font-weight: 600;
    font-family: 'Courier New', monospace;
}

#fps {
    color: #4a9eff;
    font-size: 13px;
    font-family: 'Courier New', monospace;
}

.divider {
    height: 1px;
    background: #333;
}