:root {
  --bg: #f6f7f9; --panel: #ffffff; --text: #1d2330; --muted: #6a7384; --line: #d9dde5;
  --accent: #2f5fb3; --ok: #1f7a3d; --ok-bg: #e6f4ea; --warn: #8a5a00; --warn-bg: #fff3d6;
  --bad: #a3261b; --bad-bg: #fde8e6; --code-bg: #f1f3f7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c; --panel: #1c2027; --text: #e6e9ef; --muted: #98a1b3; --line: #2f3542;
    --accent: #7fa6ee; --ok: #7ad39a; --ok-bg: #173323; --warn: #f0c56a; --warn-bg: #3a2e12;
    --bad: #ff9a8f; --bad-bg: #3d1b18; --code-bg: #12151a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; padding: 20px 16px 40px; background: var(--bg); color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
header, .toolbar, .grid, footer { max-width: 1500px; margin-left: auto; margin-right: auto; }
h1 { margin: 0 0 6px; font-size: 26px; }
h2 { margin: 0 0 10px; font-size: 15px; }
header p { margin: 4px 0; max-width: 62em; }
.muted { color: var(--muted); font-weight: 400; font-size: 13px; }
a { color: var(--accent); }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 14px auto; }
select { font: inherit; padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); max-width: 100%; }
.sketch-controls { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-left: auto; }
.inline { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }
.sketch-controls input[type="number"] { width: 9em; font: inherit; padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); }
.sketch-controls button { font: inherit; padding: 4px 10px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); color: var(--text); cursor: pointer; }
.sketch-controls input:disabled, .sketch-controls button:disabled { opacity: 0.45; cursor: default; }
#sketch-block { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line); }
.badge { padding: 4px 10px; border-radius: 999px; font-size: 13px; background: var(--code-bg); color: var(--muted); }
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.bad { background: var(--bad-bg); color: var(--bad); }
.grid { display: grid; gap: 14px; grid-template-columns: minmax(260px, 1fr) minmax(0, 1.25fr) minmax(0, 1.25fr); align-items: start; }
@media (max-width: 1100px) { .grid { grid-template-columns: 1fr; } }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px; min-width: 0; }
textarea { width: 100%; height: 600px; resize: vertical; padding: 10px; border: 1px solid var(--line); border-radius: 6px;
  background: var(--code-bg); color: var(--text); font: 12.5px/1.5 ui-monospace, "Cascadia Mono", Consolas, monospace; tab-size: 2; }
.stage { min-height: 120px; overflow: auto; background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 8px; }
.stage img { display: block; max-width: none; }
.stage .vega-embed { display: block; }
.error { margin: 10px 0 0; padding: 10px 12px; border-radius: 6px; background: var(--bad-bg); color: var(--bad);
  white-space: pre-wrap; word-break: break-word; font: 13px/1.5 ui-monospace, Consolas, monospace; }
.status { margin: 8px 0 0; font-size: 13px; color: var(--muted); }
details { margin-top: 8px; }
summary { cursor: pointer; font-size: 13px; color: var(--muted); }
.source { max-height: 260px; overflow: auto; margin: 8px 0 0; padding: 10px; border-radius: 6px; background: var(--code-bg);
  font: 11.5px/1.45 ui-monospace, Consolas, monospace; white-space: pre-wrap; word-break: break-all; }
footer { margin-top: 22px; color: var(--muted); font-size: 13px; }
footer ul { margin: 0; padding-left: 1.2em; }
footer li { margin: 3px 0; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; font-size: 12px; }