:root {
  --bg: #f6f7f5;
  --card: #ffffff;
  --ink: #1b2422;
  --muted: #5b6b67;
  --line: #d9e0dd;
  --accent: #0f5c63;
  --accent-ink: #ffffff;
  --accent-soft: #e3f0ef;
  --liquid: #4fb3b9;
  --warn: #8a5a00;
  --warn-bg: #fff4dc;
  --error: #a3262a;
  --error-bg: #fde8e8;
  --radius: 14px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101615;
    --card: #18201f;
    --ink: #e8efed;
    --muted: #9fb0ab;
    --line: #2c3836;
    --accent: #5cc0c6;
    --accent-ink: #062426;
    --accent-soft: #1d3133;
    --liquid: #3a959b;
    --warn: #f2c46b;
    --warn-bg: #2f2612;
    --error: #ff9a9a;
    --error-bg: #351818;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main, header.site, footer.site { max-width: 640px; margin: 0 auto; padding: 0 16px; }

header.site { padding-top: 18px; }
.brand { color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.01em; }
.brand span { color: var(--accent); }

h1 { font-size: clamp(1.6rem, 5vw, 2.1rem); line-height: 1.15; margin: 22px 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; margin: 28px 0 8px; }
.intro p { color: var(--muted); margin: 0 0 18px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }

.field { margin-bottom: 18px; }
.field > label, .field > .label { display: block; font-weight: 600; margin-bottom: 6px; }
.u { color: var(--muted); font-weight: 500; }
.hint { color: var(--muted); font-size: 0.875rem; margin: 6px 0 0; }

input[type="number"], select {
  width: 100%;
  font: inherit;
  font-size: 1.125rem;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 12px;
  min-height: 48px;
}
input[type="number"]:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.chip {
  font: inherit;
  font-size: 0.9rem;
  color: var(--accent);
  background: var(--accent-soft);
  border: 0;
  border-radius: 999px;
  padding: 7px 14px;
  min-height: 36px;
  cursor: pointer;
}
.chip:hover { filter: brightness(0.97); }

.with-unit { display: flex; gap: 8px; }
.with-unit input { flex: 1; min-width: 0; }

.seg { display: flex; border: 1px solid var(--line); border-radius: 10px; padding: 3px; margin: 0; gap: 3px; background: var(--bg); }
.seg label { flex: 1; position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg span {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 40px; padding: 4px 12px; border-radius: 7px;
  font-weight: 600; color: var(--muted); text-align: center; line-height: 1.2;
}
.seg small { font-weight: 500; font-size: 0.75rem; }
.seg input:checked + span { background: var(--accent); color: var(--accent-ink); }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: 2px; }
.seg.wide span { min-height: 50px; }

.msg { font-size: 0.9rem; border-radius: 8px; padding: 8px 10px; margin: 8px 0 0; }
.msg.error { color: var(--error); background: var(--error-bg); }
.msg.warn { color: var(--warn); background: var(--warn-bg); }

.result { display: block; border-radius: 12px; background: var(--accent-soft); padding: 16px; margin-top: 4px; }
.answer { margin: 0 0 6px; font-size: 1.05rem; color: var(--muted); }
.result[data-state="ok"] .answer, .result[data-state="warn"] .answer { color: var(--ink); font-size: 1.2rem; }
.answer strong { font-size: 1.9rem; color: var(--accent); letter-spacing: -0.02em; }
.answer .ml { color: var(--muted); white-space: nowrap; }

.syringe { width: 100%; height: auto; display: block; margin: 4px 0 8px; }
.syringe .barrel { fill: none; stroke: var(--ink); stroke-width: 1.5; }
.syringe .liquid { fill: var(--liquid); }
.syringe .tick { stroke: var(--ink); stroke-width: 1; }
.syringe .lbl { fill: var(--muted); font-size: 10px; text-anchor: middle; font-family: inherit; }
.syringe .needle { stroke: var(--muted); stroke-width: 1.5; }
.syringe .hub, .syringe .press { fill: var(--muted); }
.syringe .stopper { fill: var(--ink); }
.syringe .rod { stroke: var(--muted); stroke-width: 3; }

.details { margin: 0; display: grid; gap: 6px; }
.details div { display: flex; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); padding-top: 6px; }
.details dt { color: var(--muted); }
.details dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }

.check { color: var(--muted); font-size: 0.85rem; margin: 12px 0 0; }

.peek {
  position: fixed; left: 12px; right: 12px; bottom: calc(12px + env(safe-area-inset-bottom));
  max-width: 616px; margin: 0 auto;
  background: var(--accent); color: var(--accent-ink);
  border-radius: 12px; padding: 12px 16px;
  font-weight: 700; font-size: 1.05rem; text-align: center; text-decoration: none;
  box-shadow: 0 6px 20px rgb(0 0 0 / 0.25);
}
.peek[hidden] { display: none; }

.crumb { margin: 18px 0 -12px; font-size: 0.9rem; }
.crumb a, .peptide-list a { color: var(--accent); }

.lookup { margin-top: 20px; }
.lookup h2 { margin-top: 0; }
.table-wrap { overflow-x: auto; margin: 0 -4px; }
.lookup table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.lookup th, .lookup td { padding: 8px 6px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
.lookup th[scope="row"] { text-align: left; font-weight: 600; }
.lookup thead th { color: var(--muted); font-weight: 600; font-size: 0.85rem; }

.peptide-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 6px 16px; }
.peptide-list a { display: block; padding: 6px 0; }

.guide { margin-top: 20px; }
.guide h2 { margin-top: 0; }
.soon { color: var(--accent); font-weight: 600; margin-bottom: 0; }

.explain ol { padding-left: 1.3em; }
.example { background: var(--card); border-left: 4px solid var(--accent); border-radius: 8px; padding: 10px 14px; }
.example p { margin: 0; }
details { border-bottom: 1px solid var(--line); padding: 10px 0; }
summary { cursor: pointer; font-weight: 600; min-height: 32px; }
details p { color: var(--muted); margin: 8px 0 0; }

footer.site { color: var(--muted); font-size: 0.85rem; padding-top: 24px; padding-bottom: 40px; }