/* ───────────────────────────────────────────────────────────────────────
   "How SVGs work" · demo 1 "pixels versus instructions" — self-contained.

   Two copies of the site logo at the same on-screen size. Left is an inline
   <svg> (re-rendered from its path instructions at the display size — always
   crisp). Right is a <canvas> whose backing store is deliberately shrunk to
   DISPLAY / zoom pixels, then stretched back to DISPLAY with image-rendering:
   pixelated — an honest stand-in for a saved raster (PNG/JPEG) that has a fixed
   pixel grid and nothing more to give when enlarged. Only variable between the
   panels is vector-vs-raster, which is the whole lesson.
   ─────────────────────────────────────────────────────────────────────── */

:root {
  --bg: #fbfaf8;
  --panel: #ffffff;
  --text: #2c3142;
  --pale: #8a90a0;
  --line: #e6e3dd;
  --track: #ece9e3;
  --accent: #3b5bdb;   /* the SVG / vector side */
  --warm: #e8590c;     /* the raster / pixel side */
  --radius: 8px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1c22; --panel: #23262e; --text: #d7dae2;
    --pale: #8a90a0; --line: #343844; --track: #2b2f38;
    --accent: #7aa2ff; --warm: #ffa94d;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.45;
}
#demo { padding: 14px; }

#narrow-note {
  display: none;
  margin: 0 0 14px; padding: 9px 12px;
  font-size: 0.82rem; color: var(--text);
  background: var(--track); border: 1px solid var(--line);
  border-radius: var(--radius);
}
body.is-narrow #narrow-note { display: block; }

#objective { margin: 0 0 20px; max-width: 72ch; }

/* ── the two panels ──────────────────────────────────────────────────────── */
#stage { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.panel { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 9px; }
.frame {
  width: 240px; height: 240px;
  background: var(--panel);
  border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  /* subtle grid so the pixel blocks read as pixels */
  background-image:
    linear-gradient(var(--track) 1px, transparent 1px),
    linear-gradient(90deg, var(--track) 1px, transparent 1px);
  background-size: 24px 24px;
}
.frame svg { display: block; width: 240px; height: 240px; }
.vector .frame svg { fill: var(--accent); }
.frame canvas {
  width: 240px; height: 240px; display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;   /* Firefox fallback */
}
figcaption { display: flex; flex-direction: column; align-items: center; gap: 1px; text-align: center; }
.tag { font-weight: 700; }
.vector .tag { color: var(--accent); }
.raster .tag { color: var(--warm); }
.sub { font-size: 0.78rem; color: var(--pale); font-family: var(--mono); }

/* ── zoom control ────────────────────────────────────────────────────────── */
#controls { margin: 26px auto 0; max-width: 440px; text-align: center; }
#controls label { font-size: 0.92rem; }
#controls label b { font-family: var(--mono); color: var(--warm); }
#controls input[type="range"] {
  width: 100%; margin: 12px 0 4px; accent-color: var(--warm);
}
#hint { margin: 8px 0 0; font-size: 0.84rem; color: var(--pale); }
#hint b { color: var(--text); }

#credit { margin-top: 20px; font-size: 0.74rem; color: var(--pale); text-align: center; }