:root {
  --bg:           #0e1015;
  --bark-dark:    #3b2a1a;
  --bark-mid:     #5c3d20;
  --bark-light:   #8b6045;
  --green-deep:   #2d4a2d;
  --green-mid:    #4a7c4a;
  --green-bright: #6aab5e;
  --blossom:      #e8b4c0;
  --blossom-dark: #c97f96;
  --gold:         #c9a84c;
  --amber:        #e07b30;
  --rust:         #a84228;
  --moss:         #7a9e4a;
  --sky:          #1a2a3a;
  --white:        #f0ede8;
  --ui-panel:     rgba(14, 16, 21, 0.85);
  --ui-border:    rgba(255, 255, 255, 0.08);
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--white);
  font-family: 'Courier New', Courier, monospace;
}

canvas {
  display: block;
}

/* ── Vignette overlay ─────────────────────────────────────────────────────── */

body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    ellipse at 50% 60%,
    transparent 40%,
    rgba(14, 16, 21, 0.55) 100%
  );
  z-index: 1;
}

/* ── Seed display ─────────────────────────────────────────────────────────── */

#seed-display {
  position: fixed;
  bottom: 12px;
  left: 16px;
  z-index: 5;
  font-size: 10px;
  letter-spacing: 0.1em;
  opacity: 0.35;
  pointer-events: none;
  font-family: 'Courier New', Courier, monospace;
  color: var(--white);
}

/* ── UI Panel ─────────────────────────────────────────────────────────────── */

#ui-panel {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 10;
  width: 240px;
  background: var(--ui-panel);
  border: 1px solid var(--ui-border);
  border-radius: 8px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: width 0.2s, height 0.2s;
}

#ui-toggle {
  display: block;
  width: 100%;
  background: none;
  border: none;
  border-bottom: 1px solid var(--ui-border);
  color: var(--white);
  font-size: 14px;
  padding: 8px;
  cursor: pointer;
  text-align: right;
  letter-spacing: 0.05em;
}

#ui-inner {
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#ui-panel.collapsed #ui-inner {
  display: none;
}

.ui-title {
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.5;
  margin-bottom: -4px;
}

.ui-label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  cursor: default;
}

.ui-label-sm {
  font-size: 12px;
  letter-spacing: 0.04em;
  opacity: 0.7;
  margin-bottom: 4px;
}

.ui-label span {
  opacity: 0.6;
  font-size: 11px;
}

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 3px;
  background: var(--ui-border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--white);
  cursor: pointer;
}

select {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--ui-border);
  border-radius: 4px;
  color: var(--white);
  font-family: inherit;
  font-size: 12px;
  padding: 4px 6px;
  cursor: pointer;
  outline: none;
}

.palette-btns {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.pal-btn {
  flex: 1;
  min-width: 48px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--ui-border);
  border-radius: 4px;
  color: var(--white);
  font-family: inherit;
  font-size: 10px;
  padding: 4px 2px;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: background 0.15s, border-color 0.15s;
}

.pal-btn.active,
.pal-btn:hover {
  background: rgba(255,255,255,0.14);
  border-color: rgba(255,255,255,0.25);
}

.ui-row {
  display: flex;
  flex-direction: column;
}

.ui-actions {
  display: flex;
  gap: 8px;
}

.ui-actions button {
  flex: 1;
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--ui-border);
  border-radius: 4px;
  color: var(--white);
  font-family: inherit;
  font-size: 11px;
  padding: 6px 4px;
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: background 0.15s;
}

.ui-actions button:hover {
  background: rgba(255,255,255,0.16);
}

/* ── Mobile: bottom drawer ────────────────────────────────────────────────── */

@media (max-width: 600px) {
  #ui-panel {
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    border-radius: 12px 12px 0 0;
    border-bottom: none;
  }

  #ui-inner {
    max-height: 55vh;
    overflow-y: auto;
  }
}