:root {
  --bg: #f4f1ea;
  --card: #ffffff;
  --ink: #1f2933;
  --muted: #616e7c;
  --line: #e4ded3;
  --accent: #243b53;
  --accent-ink: #ffffff;
  --gold: #f0b429;
  --good: #2f8132;
  --bad: #b42318;
  --white-key: #fdfcf9;
  --black-key: #1f2933;
  --pressed: #f0b429;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12171d;
    --card: #1b222b;
    --ink: #e8edf2;
    --muted: #9aa5b1;
    --line: #2c3642;
    --accent: #f0b429;
    --accent-ink: #12171d;
    --good: #6cc070;
    --bad: #f08a80;
    --white-key: #dfe3e8;
    --black-key: #0b0f13;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }

header { padding: 32px 0 8px; }
h1 { margin: 0 0 8px; font-size: 1.75rem; letter-spacing: -0.01em; }
.tag {
  font-size: 0.8rem; font-weight: 600; vertical-align: middle;
  background: var(--gold); color: #1f2933; padding: 2px 8px; border-radius: 999px;
}
.lede { margin: 0; color: var(--muted); max-width: 62ch; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px; margin: 16px 0;
}
h2 { margin: 0 0 6px; font-size: 1.2rem; display: flex; align-items: center; gap: 10px; }
.step {
  display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: var(--accent-ink); font-size: 0.85rem;
}
.hint { color: var(--muted); margin: 0 0 14px; font-size: 0.95rem; }

.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; margin: 8px 0; }
.field { display: grid; gap: 4px; font-size: 0.85rem; color: var(--muted); min-width: 0; }
select, button {
  font: inherit; color: var(--ink); background: var(--card);
  border: 1px solid var(--line); border-radius: 9px; padding: 8px 12px; min-height: 40px;
}
select { min-width: 220px; max-width: 100%; }
button { cursor: pointer; }
button:hover:not(:disabled) { border-color: var(--muted); }
button:disabled { opacity: 0.5; cursor: default; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }

.progress { margin: 12px 0; }
.bar { height: 8px; background: var(--line); border-radius: 999px; overflow: hidden; }
#bar-fill { height: 100%; width: 0; background: var(--gold); transition: width 0.15s; }
#progress-text { margin: 6px 0 0; font-size: 0.9rem; color: var(--muted); }

.transport { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.transport input[type="range"] { flex: 1; min-width: 0; accent-color: var(--gold); }
.mono { font-variant-numeric: tabular-nums; color: var(--muted); white-space: nowrap; }

.status { display: flex; gap: 8px; flex-wrap: wrap; }
.pill { font-size: 0.85rem; border: 1px solid var(--line); border-radius: 999px; padding: 4px 10px; color: var(--muted); }
.pill.on { color: var(--good); border-color: currentColor; }

.keyboard {
  position: relative; height: 150px; margin: 12px 0 6px; user-select: none; touch-action: none;
  border-radius: 8px; overflow: hidden; border: 1px solid var(--line);
}
.key { position: absolute; top: 0; cursor: pointer; }
.key.white { height: 100%; background: var(--white-key); border-right: 1px solid var(--line); }
.key.black { height: 60%; background: var(--black-key); border-radius: 0 0 4px 4px; z-index: 1; }
.key.down { background: var(--pressed); }
.key .label { position: absolute; bottom: 6px; left: 0; right: 0; text-align: center; font-size: 0.7rem; color: #616e7c; pointer-events: none; }

table { width: 100%; border-collapse: collapse; margin: 4px 0 12px; }
th, td { text-align: left; padding: 8px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
th { width: 40%; font-weight: 500; color: var(--muted); padding-right: 12px; }
td.good { color: var(--good); }
td.bad { color: var(--bad); }

.warnings { color: var(--muted); font-size: 0.85rem; padding-left: 18px; }
kbd { font: 0.8rem ui-monospace, monospace; border: 1px solid var(--line); border-radius: 4px; padding: 0 4px; }

footer { color: var(--muted); font-size: 0.85rem; padding-bottom: 32px; }

@media (max-width: 560px) {
  th { width: 45%; }
  select { min-width: 0; width: 100%; }
  .field { width: 100%; }
  .keyboard { height: 120px; }
}