@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,600;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --color-bg: #0d0d1a;
    --color-surface: rgba(18, 18, 32, 0.92);
    --color-surface-border: #1e2a3a;
    --color-primary: #00aaff;
    --color-primary-dim: #0055aa;
    --color-primary-bright: #88ddff;
    --color-accent: #ffaa00;
    --color-secondary: #00ffcc;
    --color-secondary-dim: #00aa88;
    --color-text: #e0e0e0;
    --color-text-dim: #888888;
    --font-sans: 'DM Sans', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    margin: 0;
    overflow: hidden;
    background: var(--color-bg);
    font-family: var(--font-sans);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
}

canvas {
    display: block;
}

/* ── Stats panel (top-left) ───────────────────────── */
#statsPanel {
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 50;
    background: var(--color-surface);
    border: 1px solid var(--color-surface-border);
    border-radius: 8px;
    padding: 10px 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    line-height: 1.5;
    color: var(--color-text);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
}

#statsPanel .stat-label {
    color: var(--color-text-dim);
}

#statsPanel .stat-value {
    color: var(--color-secondary);
}

/* ── Controls rail (slide-in panel + tab) ───────────── */
.controls-rail {
    position: fixed;
    top: 14px;
    right: 14px;
    width: 24px;
    overflow: hidden;
    transition: width 0.25s ease;
    z-index: 60;
}

.controls-rail:not(.collapsed) {
    width: 276px;
}

.controls-panel {
    display: flex;
    flex-direction: row;
    width: 276px;
    box-sizing: border-box;
    transition: transform 0.25s ease;
}

.controls-rail.collapsed .controls-panel {
    transform: translateX(-252px);
}

.controls-tab {
    flex: 0 0 24px;
    width: 24px;
    min-width: 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-surface-border);
    border-left: none;
    border-radius: 0 8px 8px 0;
    color: var(--color-secondary);
    font-size: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    transition: background 0.2s, color 0.2s;
}

.controls-tab:hover {
    background: var(--color-primary-dim);
    color: var(--color-primary-bright);
}

/* ── Controls panel content ──────────────────────────── */
#controlsContainer {
    flex: 0 0 252px;
    width: 252px;
    background: var(--color-surface);
    border: 1px solid var(--color-surface-border);
    border-right: none;
    border-radius: 8px 0 0 8px;
    padding: 12px 14px;
    color: var(--color-text);
    max-height: 88vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    font-family: var(--font-sans);
    font-size: 12px;
}

#controlsContainer::-webkit-scrollbar {
    width: 6px;
}

#controlsContainer::-webkit-scrollbar-track {
    background: var(--color-bg);
    border-radius: 3px;
}

#controlsContainer::-webkit-scrollbar-thumb {
    background: var(--color-primary-dim);
    border-radius: 3px;
}

.controlGroup {
    border-bottom: 1px solid var(--color-surface-border);
    padding-bottom: 10px;
    margin-bottom: 10px;
}

.controlGroup:last-child {
    border-bottom: none;
    padding-bottom: 0;
    margin-bottom: 0;
}

.controlGroup.collapsed .groupContent {
    display: none;
}

.controlGroup.collapsed .groupTitle::after {
    content: ' \25B6';
    opacity: 0.7;
}

.groupTitle {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: 8px;
    cursor: pointer;
    user-select: none;
}

.groupTitle:hover {
    color: var(--color-primary-bright);
}

.controlGroup:not(.collapsed) .groupTitle::after {
    content: ' \25BC';
    opacity: 0.7;
}

.control {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 6px;
}

.control:last-child {
    margin-bottom: 0;
}

.control label {
    flex: 1;
    min-width: 0;
    color: var(--color-text);
}

.control input[type="range"] {
    flex: 1.4;
    min-width: 0;
    height: 5px;
    accent-color: var(--color-secondary);
}

.control span {
    flex: 0 0 38px;
    text-align: right;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-secondary);
}

.control input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-secondary);
}

.control select {
    flex: 1;
    min-width: 0;
    background: var(--color-bg);
    color: var(--color-primary);
    border: 1px solid var(--color-primary-dim);
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 5px 6px;
    border-radius: 5px;
    cursor: pointer;
}

.control select:focus {
    outline: none;
    border-color: var(--color-secondary);
}

/* Button (Pause) */
.btn {
    display: inline-block;
    padding: 6px 12px;
    margin-top: 2px;
    background: var(--color-primary-dim);
    color: var(--color-primary-bright);
    border: 1px solid var(--color-primary);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

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

.btn.paused {
    background: var(--color-accent);
    color: #000;
    border-color: var(--color-accent);
}

#radiusValue {
    min-width: 28px;
    text-align: right;
}

/* ── Chart area ─────────────────────────────────────── */
.chart-wrap {
    position: fixed;
    left: 14px;
    right: 14px;
    bottom: 14px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-surface);
    border: 1px solid var(--color-surface-border);
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    padding: 6px 10px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--color-text-dim);
}

.chart-header .chart-title {
    color: var(--color-primary);
}

.chart-toggle {
    background: none;
    border: none;
    color: var(--color-secondary);
    font-family: var(--font-mono);
    font-size: 11px;
    cursor: pointer;
    padding: 3px 6px;
    border-radius: 4px;
    transition: color 0.2s, background 0.2s;
}

.chart-toggle:hover {
    color: var(--color-secondary-dim);
    background: rgba(0, 255, 204, 0.1);
}

.ant-chart-area {
    width: 100%;
    height: 108px;
    background: var(--color-bg);
    border: 1px solid var(--color-surface-border);
    border-top: none;
    border-radius: 0 0 8px 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.chart-wrap.collapsed .ant-chart-area {
    height: 0;
    min-height: 0;
    overflow: hidden;
    border: none;
}

.chart-wrap.collapsed .chart-header {
    border-radius: 8px;
    border-bottom: 1px solid var(--color-surface-border);
}

/* H key: hide all UI */
body.ui-hidden #statsPanel,
body.ui-hidden .controls-rail,
body.ui-hidden .chart-wrap {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}