:root {
  --paper: #f3efe4;
  --ink: #1a1714;
  --muted: #5c564c;
  --rule: #d9cfc0;
  --margin: #c4492c;
  --teal: #0e5c57;
  --card: #fffdf8;
  --danger: #8f2d2d;
  --ok: #1d6b3a;
  --nav: #172421;
  color-scheme: light;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  border-left: 8px solid var(--margin);
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.45 "PingFang SC", "Noto Sans SC", "Source Han Sans SC", sans-serif;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 16px;
  top: 12px;
  z-index: 3;
  background: var(--card);
  padding: 8px 12px;
}

header { padding: 18px 16px 0; }

.eyebrow {
  margin: 0;
  color: var(--margin);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

h1, h2 {
  font-family: "Iowan Old Style", Palatino, "Songti SC", serif;
  font-weight: 600;
}

h1 { margin: 0; font-size: 1.8rem; }

h2 { margin: 0 0 10px; font-size: 1.15rem; }

main { padding-bottom: calc(84px + env(safe-area-inset-bottom)); }

.card {
  margin: 12px 16px;
  padding: 14px;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 14px;
}

label {
  display: grid;
  gap: 4px;
  margin: 0 0 12px;
  font-size: 0.92rem;
}

input, textarea, select, button { font: inherit; color: inherit; }

input, textarea, select {
  width: 100%;
  min-height: 48px;
  padding: 12px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 10px;
}

textarea { min-height: 96px; resize: vertical; }

fieldset {
  margin: 0 0 12px;
  padding: 0;
  border: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

legend {
  width: 100%;
  margin-bottom: 6px;
  padding: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

fieldset label,
label.check {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0 0 8px;
  min-height: 44px;
  padding: 8px 12px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 999px;
}

details.rare {
  margin: 0 0 12px;
  padding: 8px 12px;
  border: 1px dashed var(--rule);
  border-radius: 12px;
}

details.rare summary {
  min-height: 44px;
  cursor: pointer;
}

fieldset input { width: auto; min-height: 0; }

.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: end; }

.row > .grow, label.grow { flex: 1; min-width: 140px; }

.stack { display: grid; gap: 8px; margin-top: 12px; }

.draft { display: flex; gap: 8px; }

button {
  min-height: 48px;
  padding: 0 14px;
  border-radius: 12px;
  cursor: pointer;
}

button.primary { background: var(--teal); color: #f4f0e6; border: 0; }

button.ghost { background: transparent; color: var(--ink); border: 1px solid var(--rule); }

button.grow { flex: 1; text-align: left; }

.chip { border-radius: 999px; }

.result {
  margin: 4px 0;
  font-size: 1.55rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  white-space: pre-line;
}

.result.over { color: var(--danger); }

.result.under { color: var(--ok); }

.formula {
  margin: 0;
  color: #4a433a;
  font-family: "Iowan Old Style", Palatino, "Songti SC", serif;
  font-size: 0.98rem;
}

.hint, .fine { color: var(--muted); font-size: 0.85rem; }

.fine { margin: 0 16px 8px; }

.error { min-height: 1.2em; margin: 0; color: var(--danger); }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
  background: var(--nav);
}

nav button {
  color: #efe7d6;
  background: transparent;
  border: 0;
  border-radius: 10px;
}

nav button[aria-current="page"] {
  background: var(--paper);
  color: #083734;
}