:root {
  --panel-bg: rgba(12, 12, 12, 0.72);
  --panel-border: rgba(255, 255, 255, 0.08);
  --text: #e6e6e6;
  --text-dim: #8c8c8c;
  --accent: #fff;
  --track: #333;
}

html,
body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #000;
  color: var(--text);
  font-family: system-ui, sans-serif;
}

canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: block;
  touch-action: none;
  cursor: grab;
}

canvas:active {
  cursor: grabbing;
}

/* ---------- panel ---------- */

.panel {
  position: fixed;
  top: 0;
  right: 0;
  width: min(203px, 100vw);
  max-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-top: none;
  border-right: none;
  border-radius: 8px 0 8px 8px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5);
  font-size: 12px;
  user-select: none;
  transition: box-shadow 200ms ease-in-out;
}

.panel:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.15);
}

.panel.collapsed {
  width: auto;
}

.panel.collapsed .panel-body {
  display: none;
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
}

/* odsuwa przycisk resetu i FPS do prawej */
#btnCollapse {
  margin-right: auto;
}

.fps {
  font-variant-numeric: tabular-nums;
  color: var(--text-dim);
  min-width: 4.5em;
  text-align: right;
}

.panel-body {
  overflow-y: auto;
  padding: 0 10px 10px;
  scrollbar-width: thin;
  scrollbar-color: #444 transparent;
}

button {
  all: unset;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  text-align: center;
  transition: background 150ms;
}

button:hover {
  background: rgba(255, 255, 255, 0.14);
}

button:focus-visible {
  outline: 1px solid var(--accent);
}

.icon-btn {
  padding: 2px 7px;
  font-size: 14px;
}

button[hidden] {
  display: none;
}

/* ---------- grupy ---------- */

.group {
  border-top: 1px solid var(--panel-border);
  padding: 4px 0;
}

.row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 2px 8px;
  padding: 3px 0;
}

.row label {
  color: var(--text);
}

.row output {
  font-variant-numeric: tabular-nums;
  color: var(--text-dim);
}

.row input[type='range'] {
  grid-column: 1 / -1;
}

.row.inline {
  grid-template-columns: 1fr auto;
}

/* ---------- kontrolki ---------- */

input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 16px;
  background: transparent;
  margin: 0;
  cursor: pointer;
}

input[type='range']::-webkit-slider-runnable-track {
  height: 3px;
  background: var(--track);
  border-radius: 2px;
}

input[type='range']::-moz-range-track {
  height: 3px;
  background: var(--track);
  border-radius: 2px;
}

input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  margin-top: -4.5px;
  border-radius: 50%;
  background: #ddd;
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.4);
}

input[type='range']::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border: none;
  border-radius: 50%;
  background: #ddd;
}

input[type='range']:hover::-webkit-slider-thumb {
  background: var(--accent);
}

input[type='range']:hover::-moz-range-thumb {
  background: var(--accent);
}

input[type='checkbox'] {
  accent-color: #bbb;
  width: 14px;
  height: 14px;
  margin: 0;
  cursor: pointer;
}

input[type='color'] {
  width: 36px;
  height: 18px;
  padding: 0;
  border: 1px solid var(--panel-border);
  border-radius: 3px;
  background: none;
  cursor: pointer;
}

select {
  background: #1a1a1a;
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 2px 4px;
  font: inherit;
  cursor: pointer;
}


/* ---------- przełącznik segmentowy ---------- */

.row.segment-row {
  grid-template-columns: 1fr;
}

.segment {
  display: flex;
  padding: 2px;
  gap: 2px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 5px;
}

.segment button {
  flex: 1;
  font-size: 11px;
  padding: 4px 6px;
  background: transparent;
  color: var(--text-dim);
}

.segment button[aria-checked='true'] {
  background: rgba(255, 255, 255, 0.18);
  color: var(--text);
}

.row[hidden] {
  display: none;
}