:root {
  color-scheme: dark light;

  --bg: #0a121c;
  --canvas-bg: #08121b;
  --panel: #0d1723;
  --panel-hover: #152132;
  --ink: #edf2f7;
  --ink-muted: #9aadc2;
  --ink-soft: #6b8198;
  --line: rgba(173, 192, 212, 0.14);
  --line-strong: rgba(173, 192, 212, 0.28);
  --input-bg: #0a131e;
  --accent: #c69a45;
  --accent-strong: #e2b35b;
  --accent-cool: #6d95bf;
  --accent-ink: #12171d;

  --sidebar-width: 300px;
  --radius: 6px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f5f8;
    --canvas-bg: #eceff4;
    --panel: #ffffff;
    --panel-hover: #f1f4f8;
    --ink: #1a2330;
    --ink-muted: #566275;
    --ink-soft: #8a95a4;
    --line: rgba(30, 46, 66, 0.14);
    --line-strong: rgba(30, 46, 66, 0.26);
    --input-bg: #ffffff;
    --accent: #b48435;
    --accent-strong: #9a6f24;
    --accent-cool: #3f6a9b;
    --accent-ink: #ffffff;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
}

body {
  font-family: "Inter", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

.app-shell {
  display: flex;
  height: 100dvh;
  width: 100%;
  overflow: hidden;
}

.stage {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  background: var(--canvas-bg);
}

#life-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--canvas-bg);
}

/* Floating show-controls button (visible only when sidebar is collapsed) */
.sidebar-show {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink-muted);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22);
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.sidebar-show:hover {
  color: var(--ink);
  border-color: var(--line-strong);
  background: var(--panel-hover);
}

body.sidebar-collapsed .sidebar-show {
  display: inline-flex;
}

/* Sidebar — flat column, not floating */
.sidebar {
  flex: 0 0 var(--sidebar-width);
  width: var(--sidebar-width);
  height: 100%;
  border-left: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
  transition: flex-basis 180ms ease, width 180ms ease, border-color 180ms ease;
}

body.sidebar-collapsed .sidebar {
  flex: 0 0 0;
  width: 0;
  border-left-color: transparent;
}

.sidebar-inner {
  width: var(--sidebar-width);
  height: 100%;
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  overflow-x: visible;
  position: relative;
}

.sidebar-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.sidebar-title {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}

.sidebar-hide {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.sidebar-hide:hover {
  color: var(--ink);
  border-color: var(--line);
  background: var(--panel-hover);
}

/* Stats row */
.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  padding: 8px 0 2px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat span {
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.stat strong {
  font-size: 1.05rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

/* Buttons */
button {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: border-color 120ms ease, background 120ms ease, color 120ms ease;
}

button:hover {
  border-color: var(--line-strong);
  background: var(--panel-hover);
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

button.primary:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

/* Tooltip element appended to body by JS */
#floating-tooltip {
  position: fixed;
  z-index: 9999;
  max-width: 220px;
  padding: 8px 10px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--bg);
  font-size: 0.72rem;
  font-weight: 400;
  line-height: 1.45;
  pointer-events: none;
  opacity: 0;
  transition: opacity 100ms ease;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22);
}

#floating-tooltip.visible {
  opacity: 1;
}

button.full {
  width: 100%;
  padding: 11px 12px;
  font-size: 0.9rem;
}

.button-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.button-row.triple {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Fields */
.field {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.field > span {
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  align-items: stretch;
}

.field.checkbox {
  grid-template-rows: auto 1fr;
  padding-top: 3px;
}

.field.checkbox input[type="checkbox"] {
  justify-self: center;
  align-self: center;
}

input[type="number"],
input[type="text"],
select {
  width: 100%;
  min-height: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 6px 8px;
  background: var(--input-bg);
  color: var(--ink);
}

select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-muted) 50%),
    linear-gradient(-45deg, transparent 50%, var(--ink-muted) 50%);
  background-position: calc(100% - 14px) 50%, calc(100% - 9px) 50%;
  background-size: 5px 5px;
  background-repeat: no-repeat;
  padding-right: 24px;
}

input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--accent-cool);
}

/* Ranges */
.range {
  display: grid;
  gap: 4px;
  margin-top: 2px;
}

.range > span {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}

.range > span strong {
  font-size: 0.78rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
  color: var(--ink);
}

.info-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  min-height: unset;
  padding: 0;
  margin: 0 2px;
  border: 1px solid var(--ink-soft);
  border-radius: 50%;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.65rem;
  font-weight: 700;
  cursor: help;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
}

.info-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
  background: var(--panel-hover);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent-cool);
}

/* Image I/O */
.io-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 2px;
}

.file-field {
  display: grid;
  gap: 4px;
}

.file-field > span {
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}

input[type="file"] {
  width: 100%;
  font-size: 0.78rem;
  color: var(--ink-muted);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 5px 6px;
  background: var(--input-bg);
}

input[type="file"]::file-selector-button {
  margin-right: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 8px;
  font-size: 0.76rem;
  color: var(--ink);
  background: var(--panel-hover);
  cursor: pointer;
}

/* Responsive */
@media (max-width: 720px) {
  :root {
    --sidebar-width: 260px;
  }

  .sidebar-inner {
    padding: 12px 12px 14px;
  }
}

@media (max-width: 560px) {
  :root {
    --sidebar-width: 88vw;
  }

  .app-shell {
    position: relative;
  }

  .sidebar {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    box-shadow: -12px 0 30px rgba(0, 0, 0, 0.35);
  }
}