/* Minimal flat theme with stronger contrast for controls, white slider */
:root {
  --navy: #1a2238;
  --grey: #e5e7eb;
  --bg: var(--grey);
  --ink: var(--navy);
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 8px 30px rgba(0,0,0,.06);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
  background:
    radial-gradient(900px 480px at 110% 0%, color-mix(in oklab, var(--navy) 12%, var(--grey)), transparent 60%),
    var(--bg);
  color: var(--ink);
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 12px;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--navy);
  padding: 10px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1.5px solid rgba(255,255,255,0.9);
}

.group { display: grid; gap: 4px; }
.group.row { display: flex; gap: 8px; align-items: center; }
label { font-size: 12px; color: #ffffff; font-weight: 600; letter-spacing: .02em; }

#color {
  accent-color: #ffffff;
  outline: none;
  border: 1.5px solid rgba(255,255,255,0.95);
  border-radius: 8px;
  background: rgba(255,255,255,0.1);
  padding: 4px;
}

/* White slider styling */
#size {
  width: 160px;
  accent-color: #ffffff;
  outline: none;
  border: 1.5px solid rgba(255,255,255,0.95);
  border-radius: 8px;
  background: #ffffff;
  height: 6px;
}
#size::-webkit-slider-thumb {
  background: var(--navy);
  border: 2px solid #ffffff;
}
#size::-moz-range-thumb {
  background: var(--navy);
  border: 2px solid #ffffff;
}

.btn {
  font: inherit;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1.5px solid rgba(255,255,255,0.9);
  background: rgba(255,255,255,0.08);
  color: #ffffff;
  cursor: pointer;
  transition: transform .02s ease, background .15s ease, color .15s ease;
}
.btn:hover { background: rgba(255,255,255,0.16); }
.btn:active { transform: translateY(1px); }
.btn.active { outline: 2px solid #ffffff; outline-offset: 1px; }
.btn.primary { background: #ffffff; color: var(--navy); }

.spacer { flex: 1 1 auto; }

.stage {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid color-mix(in oklab, var(--ink) 10%, transparent);
  padding: 12px;
  display: grid;
  place-items: center;
}

canvas {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  background: white;
  border-radius: 12px;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 2px rgba(26,34,56,0.2);
  cursor: crosshair;
}

@media (prefers-color-scheme: dark) {
  :root { --card: #0f1117; }
  body { background: radial-gradient(900px 480px at 110% 0%, color-mix(in oklab, var(--navy) 25%, #0b0c10), transparent 60%), #0b0c10; }
  .stage { border-color: #1f2937; }
}