:root {
  color-scheme: light dark;
  --bg: #f4f2ec;
  --surface: #ffffff;
  --ink: #1d1f20;
  --muted: #565a5c;
  --line: #d3cfc5;
  --accent: #b4440e;
  --accent-ink: #ffffff;
  --error: #a3211b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17191a;
    --surface: #222527;
    --ink: #f0eee9;
    --muted: #b3b6b7;
    --line: #3b3f42;
    --accent: #f08a4b;
    --accent-ink: #17191a;
    --error: #ff9a92;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }

.site-header { padding: 16px 0; }
.logo { color: var(--ink); font-weight: 750; letter-spacing: -0.01em; text-decoration: none; display: inline-flex; gap: 8px; align-items: center; min-height: 44px; }

h1 { font-size: clamp(30px, 6vw, 44px); line-height: 1.1; letter-spacing: -0.02em; margin: 8px 0 12px; }
h2 { font-size: 24px; line-height: 1.2; margin: 40px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 18px; margin: 24px 0 4px; }
.lead { color: var(--muted); max-width: 62ch; margin: 0 0 20px; }
.answer { font-size: 20px; max-width: 62ch; }

.calculator { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 20px; display: grid; gap: 24px; }
.calculator h2 { margin: 0 0 14px; }
.notice { color: var(--muted); font-size: 14px; margin: 10px 0 0; }

.shapes { border: 0; padding: 0; margin: 0 0 16px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.shapes legend { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.shapes label { display: block; }
.shapes input { position: absolute; opacity: 0; }
.shapes span { display: flex; min-height: 44px; align-items: center; justify-content: center; border: 1px solid var(--line); border-radius: 6px; font-weight: 600; cursor: pointer; }
.shapes input:checked + span { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.shapes input:focus-visible + span { outline: 3px solid var(--ink); outline-offset: 1px; }

.fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.field label { display: block; font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.field input, .yield-editor input { width: 100%; min-height: 44px; padding: 8px 10px; font: inherit; color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 6px; font-variant-numeric: tabular-nums; }
input[aria-invalid="true"] { border-color: var(--error); }
input:focus-visible { outline: 3px solid var(--accent); outline-offset: 1px; }
.error { color: var(--error); font-size: 14px; margin: 4px 0 0; }

.output { border-top: 1px solid var(--line); padding-top: 18px; }
.hint { color: var(--muted); margin: 0; }
.result-label { font-size: 14px; font-weight: 600; color: var(--muted); margin: 0; }
.summary { font-size: 24px; font-weight: 700; margin: 0; font-variant-numeric: tabular-nums; }
.waste-line { color: var(--muted); margin: 0 0 16px; font-size: 15px; }
.bags { list-style: none; padding: 0; margin: 6px 0 12px; }
.bags li { padding: 10px 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; align-items: center; }
.bag-main { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.bag-count { font-size: 34px; line-height: 1; font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }
.bag-line { font-size: 15px; }
.edit { min-height: 44px; background: none; border: 0; color: var(--accent); font: inherit; font-size: 15px; text-decoration: underline; cursor: pointer; padding: 0 2px; }
.yield-editor { grid-column: 1 / -1; font-size: 15px; }
.small { color: var(--muted); font-size: 14px; margin: 4px 0 0; }

.table-scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; background: var(--surface); font-variant-numeric: tabular-nums; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: right; }
th:first-child, td:first-child { text-align: left; }
caption { text-align: left; color: var(--muted); font-size: 15px; padding-bottom: 6px; }

.formula { background: var(--surface); border-left: 4px solid var(--accent); padding: 10px 14px; margin: 10px 0; }
.related { padding-left: 20px; }
.related li { margin: 6px 0; }
.legal { max-width: 70ch; }

.site-footer { margin-top: 56px; padding: 20px 0 32px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
.footer-row { display: flex; flex-wrap: wrap; gap: 8px 20px; justify-content: space-between; }
.site-footer nav { display: flex; gap: 16px; }
.site-footer a { display: inline-block; padding: 6px 0; }

@media (min-width: 760px) {
  .calculator { grid-template-columns: 1fr 1fr; align-items: start; }
  .output { border-top: 0; border-left: 1px solid var(--line); padding: 0 0 0 24px; }
}