:root {
  --bg: #f4f1ea;
  --surface: #fffdf8;
  --ink: #1b1a17;
  --muted: #6b665c;
  --line: #d9d3c6;
  --red: #c8231c;
  --accent: #1b1a17;
  --on-accent: #fffdf8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161513;
    --surface: #201f1c;
    --ink: #f1ede4;
    --muted: #a39d90;
    --line: #3a3732;
    --red: #e5483f;
    --accent: #f1ede4;
    --on-accent: #161513;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
  padding: 0 16px env(safe-area-inset-bottom);
}
header, main, footer { max-width: 720px; margin: 0 auto; }
header { padding: 20px 0 8px; }
h1 { margin: 0; font-size: 28px; letter-spacing: -0.01em; }
h1::after { content: ""; display: inline-block; width: 10px; height: 10px; background: var(--red); margin-left: 6px; }
h2 { font-size: 18px; margin: 0 0 8px; }
.lede, footer p, .status { color: var(--muted); }
.lede { margin: 6px 0 0; }
footer { padding: 24px 0 32px; font-size: 14px; }

nav#pages { display: flex; gap: 6px; flex-wrap: wrap; margin: 12px 0; }
nav#pages button[aria-current="true"] { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }

.frame {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 8px;
  border-radius: 6px;
}
canvas {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: pixelated;
  touch-action: none;
  cursor: crosshair;
}
#grid { max-width: 480px; margin: 0 auto; }

.status { min-height: 1.45em; margin: 10px 0; }
.status.err { color: var(--red); }

.actions, .tools { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin: 10px 0; }
.actions { justify-content: flex-end; }

button {
  font: inherit;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
button.primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 600; }
button:disabled { opacity: 0.5; cursor: progress; }
button:focus-visible, input:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

.swatch { width: 44px; padding: 0; border-width: 2px; }
.swatch[data-c="2"] { background: #111; }
.swatch[data-c="3"] { background: #d22; }
.swatch[data-c="1"] { background: #fff; }
.swatch.eraser { background: var(--surface); }
.swatch[aria-pressed="true"] { outline: 3px solid var(--red); outline-offset: 2px; }

label { display: block; color: var(--muted); font-size: 14px; }
input {
  display: block;
  width: 100%;
  margin-top: 4px;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
  min-height: 44px;
  padding: 0 12px;
}
#admin { border-top: 1px solid var(--line); margin-top: 24px; padding-top: 16px; }
#admin button { margin-top: 8px; }