:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --text: #1c1f1e;
  --muted: #5f6763;
  --line: #e3e6e3;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --yes: #15803d;
  --brief: #a16207;
  --surge: #c2410c;
  --no: #b91c1c;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121514;
    --surface: #1a1e1d;
    --text: #e8ebe9;
    --muted: #9aa39f;
    --line: #2c3230;
    --accent: #2dd4bf;
    --accent-ink: #062a26;
    --yes: #4ade80;
    --brief: #facc15;
    --surge: #fb923c;
    --no: #f87171;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
.wrap { max-width: 860px; margin: 0 auto; padding: 0 16px; }
.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; flex-wrap: wrap; }
.logo { font-weight: 800; font-size: 1.15rem; text-decoration: none; color: var(--text); }
.bolt { margin-right: 4px; }
.site-header nav a { margin-left: 16px; text-decoration: none; color: var(--muted); font-size: .95rem; }
.site-header nav a:hover { color: var(--accent); }
main { padding: 24px 16px 48px; }
h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); line-height: 1.2; margin: 8px 0 12px; }
h2 { font-size: 1.3rem; margin: 36px 0 12px; }
.lead { font-size: 1.1rem; color: var(--muted); }
.muted { color: var(--muted); }
.crumbs { font-size: .85rem; color: var(--muted); }
.crumbs a { color: var(--muted); }
.updated { font-size: .85rem; color: var(--muted); margin: 0 0 16px; }
.answer { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--accent); border-radius: var(--radius); padding: 16px 20px; font-size: 1.1rem; }
.warn { background: color-mix(in srgb, var(--surge) 12%, transparent); border-radius: var(--radius); padding: 10px 14px; font-size: .95rem; }
.buy { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 20px 0; padding: 14px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.btn { display: inline-block; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 8px; padding: 10px 18px; font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; white-space: nowrap; }
.buy-cta { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.btn:hover { filter: brightness(1.08); }
table { width: 100%; border-collapse: collapse; background: var(--surface); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.spec { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child th, tr:last-child td { border-bottom: 0; }
.spec th { width: 45%; font-weight: 500; color: var(--muted); }
.list thead th { font-size: .85rem; color: var(--muted); font-weight: 600; }
.formula code { display: block; overflow-x: auto; padding: 10px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; font-size: .9rem; }
.badge { display: inline-block; font-size: .78rem; font-weight: 700; padding: 2px 8px; border-radius: 999px; border: 1px solid currentColor; white-space: nowrap; }
.v-yes { color: var(--yes); } .v-brief { color: var(--brief); } .v-surge { color: var(--surge); } .v-no { color: var(--no); }
.chips { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips a { display: inline-block; padding: 6px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-size: .92rem; }
.chips a:hover { border-color: var(--accent); }
.calc, .picker { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 4px 20px 20px; margin-top: 32px; }
.picker { display: grid; grid-template-columns: 1fr 1fr auto; gap: 12px; align-items: end; padding: 20px; }
.calc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: .85rem; color: var(--muted); }
input, select { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; width: 100%; }
.calc-out { display: block; margin-top: 16px; font-size: 1.2rem; }
.calc-out small { font-size: .85rem; color: var(--muted); }
details { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; margin-bottom: 8px; }
summary { cursor: pointer; font-weight: 600; }
.picks ul { padding-left: 20px; }
.prose { max-width: 700px; }
.site-footer { border-top: 1px solid var(--line); padding: 24px 0; font-size: .9rem; color: var(--muted); }
@media (max-width: 640px) {
  .calc-grid { grid-template-columns: 1fr 1fr; }
  .picker { grid-template-columns: 1fr; }
  .buy { flex-direction: column; align-items: flex-start; }
  .site-header nav a { margin: 0 12px 0 0; }
}