:root {
  --bg: #f7f7f7;
  --card: #ffffff;
  --ink: #535353;
  --faint: #b5b5b5;
  --text: #2b2b2b;
  --muted: #7a7a7a;
  --border: #e2e2e2;
  --accent: #d9622b;
  --bubble: #ffffff;
  --ok: #2e9e5b;
  --bad: #c0392b;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #171717;
    --card: #222222;
    --ink: #d6d6d6;
    --faint: #555555;
    --text: #ececec;
    --muted: #9a9a9a;
    --border: #333333;
    --bubble: #2c2c2c;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #171717;
  --card: #222222;
  --ink: #d6d6d6;
  --faint: #555555;
  --text: #ececec;
  --muted: #9a9a9a;
  --border: #333333;
  --bubble: #2c2c2c;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
}
main { max-width: 860px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 22px; margin: 0; }
h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 0 0 10px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
header { margin-bottom: 16px; }
header p { margin: 4px 0 0; font-size: 13px; }

.stage { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.hud { display: flex; justify-content: space-between; font: 14px ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--ink); padding: 0 4px 6px; }
.hud b { font-weight: 600; }
canvas { display: block; width: 100%; height: auto; }
.controls { display: flex; gap: 12px; align-items: center; padding-top: 8px; font-size: 13px; flex-wrap: wrap; }
button {
  font: inherit; color: var(--text); cursor: pointer;
  background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 6px 12px;
}
button:hover { border-color: var(--accent); }

.grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 16px; margin-top: 16px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; min-width: 0; }
dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; margin: 0 0 10px; }
dt { color: var(--muted); }
dd { margin: 0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }

.log { list-style: none; margin: 0; padding: 0; max-height: 260px; overflow-y: auto; font-size: 13px; }
.log li { padding: 6px 0; border-bottom: 1px solid var(--border); }
.log .res { display: inline-block; width: 14px; color: var(--muted); }
.log li.ok .res { color: var(--ok); }
.log li.bad .res { color: var(--bad); }
.log .act { color: var(--accent); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.log .why { color: var(--muted); padding-left: 18px; }

.install { margin-top: 16px; }
.install summary { cursor: pointer; font-weight: 600; font-size: 14px; list-style: none; display: flex; align-items: center; gap: 8px; }
.install summary::-webkit-details-marker { display: none; }
.install summary::before { content: "▸"; color: var(--accent); transition: transform .15s; }
.install[open] summary::before { transform: rotate(90deg); }
.install summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
.steps { list-style: none; grid-template-columns: minmax(0, 1fr); counter-reset: step; margin: 12px 0 8px; padding: 0; display: grid; gap: 12px; }
.steps li { counter-increment: step; display: grid; min-width: 0; gap: 6px; font-size: 13px; }
.steps li > span::before { content: counter(step) ". "; color: var(--accent); font-weight: 600; }
.install p { margin: 0; }
.advanced { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 10px; }
.advanced summary { font-weight: 500; font-size: 13px; color: var(--muted); }
.advanced[open] summary { color: var(--text); }
.install[open] .advanced:not([open]) summary::before { transform: none; }
.advanced > p { margin-top: 8px; }
.steps.alt li > span::before { content: counter(step, upper-alpha) ". "; }
.steps li > span code { font-size: 12px; }
.copy {
  display: flex; gap: 10px; align-items: center;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 4px 4px 4px 10px;
}
.copy code { flex: 1; min-width: 0; overflow-wrap: anywhere; font: 12.5px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--text); }
.copy button { flex: none; font: inherit; font-size: 12.5px; cursor: pointer; padding: 4px 10px; color: var(--muted); background: none; border: 0; }
.copy button:hover { color: var(--text); }

@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
}
.install .small a { color: var(--accent); }