:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --border: #d9d9d9;
  --card: #fafafa;
  --accent: #2f6fde;
  --accent-fg: #ffffff;
  --warn-bg: #fff6dd;
  --warn-border: #d9a400;
  --error: #b42318;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #e8e8e8;
    --muted: #9a9a9a;
    --border: #333333;
    --card: #1b1b1b;
    --accent: #6c9cff;
    --accent-fg: #0b0b0b;
    --warn-bg: #2b2412;
    --warn-border: #c99a1a;
    --error: #ff8a80;
  }
}

* { box-sizing: border-box; }

/* The page toggles panels with the hidden attribute; author display rules (.menu is flex) must not override it. */
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  max-width: 34rem;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.controls { display: flex; align-items: center; gap: 0.25rem; }

button {
  font: inherit;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--fg);
  cursor: pointer;
}
button.primary { width: 100%; background: var(--accent); border-color: var(--accent); color: var(--accent-fg); font-weight: 600; }
button:disabled { opacity: 0.55; cursor: not-allowed; }
button.link { border: none; background: none; color: var(--muted); padding: 0.2rem 0.35rem; }

input {
  font: inherit;
  min-width: 0;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
}

label { display: block; margin-bottom: 0.3rem; color: var(--muted); font-size: 0.9rem; }
.row { display: flex; gap: 0.5rem; }
.row input { flex: 1; }

.tabs { display: flex; gap: 0.25rem; margin: 1.1rem 0 1rem; border-bottom: 1px solid var(--border); }
.tabs button { border: none; border-bottom: 2px solid transparent; border-radius: 0; background: none; }
.tabs button[aria-selected="true"] { border-bottom-color: var(--fg); font-weight: 600; }

.menu {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.6rem;
  padding: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
}
.menu img { width: 20px; height: 20px; margin-right: 0.45rem; vertical-align: middle; }
.menu button { text-align: left; }

.card {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
}
.card .title { font-size: 1.05rem; }

dl.facts { display: grid; grid-template-columns: auto 1fr; gap: 0.2rem 0.8rem; margin: 0.7rem 0; }
dl.facts dt { color: var(--muted); }
dl.facts dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
dl.facts .total { font-weight: 600; }

table { width: 100%; border-collapse: collapse; margin: 0.5rem 0; }
th, td { padding: 0.35rem 0.2rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 500; font-size: 0.9rem; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
tr.muted td { color: var(--muted); }

.totals { margin: 0.6rem 0; }
.warn { margin: 0.75rem 0; padding: 0.5rem 0.7rem; border-left: 3px solid var(--warn-border); background: var(--warn-bg); }
.error { color: var(--error); }
.muted { color: var(--muted); }
.spaced { margin-top: 0.75rem; }

details { margin-top: 0.75rem; }
summary { cursor: pointer; }
ol { margin: 0.4rem 0 0.4rem 1.3rem; padding: 0; }
.result li { overflow-wrap: anywhere; }

a { color: var(--accent); }
footer { margin-top: 2.5rem; font-size: 0.85rem; }