:root {
  --bg: #fbf9f4;
  --card: #ffffff;
  --ink: #45202b;
  --sub: #6e5a57;
  --faint: #a0918c;
  --line: #e6ded5;
  --accent: #4a1a2c;
  --accent-ink: #fbf9f4;
  --accent-soft: #f3e9e6;
  --brand: #4a1a2c;
  --brand-ink: #fbf9f4;
  --warn: #8a5a12;
  --warn-soft: #f8efe0;
  --danger: #a3393a;
  --danger-soft: #f7e4e2;
  --field: #fffdfa;
  --radius: 6px;
  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'Instrument Sans', ui-sans-serif, -apple-system, 'Segoe UI', sans-serif;
  --shadow: 0 1px 2px rgba(69, 32, 43, 0.04), 0 8px 24px rgba(69, 32, 43, 0.06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1215;
    --card: #261a1e;
    --ink: #f2e9e6;
    --sub: #c2b1ac;
    --faint: #8e7d78;
    --line: #3a2a2f;
    --accent: #dcaab7;
    --accent-ink: #2a1018;
    --accent-soft: #3a2229;
    --brand: #2a1018;
    --brand-ink: #f2e9e6;
    --warn: #e2b264;
    --warn-soft: #33291a;
    --danger: #ec8d82;
    --danger-soft: #3a2220;
    --field: #21161a;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
}
a { color: var(--accent); }
img { max-width: 100%; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; line-height: 1.1; letter-spacing: 0; margin: 0 0 0.5em; }
h3 { font-size: 1.35rem; }
h1 { font-size: clamp(2.4rem, 6vw, 3.8rem); font-weight: 400; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); }
p { margin: 0 0 1em; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }

/* header */
.top { position: sticky; top: 0; z-index: 10; background: var(--brand); color: var(--brand-ink); }
.top .wrap { display: flex; align-items: center; gap: 20px; height: 64px; }
.logo { font-family: var(--serif); font-weight: 500; font-size: 1.6rem; letter-spacing: 0.14em; color: inherit; text-decoration: none; display: flex; align-items: center; gap: 10px; }
.logo-mark { width: 30px; height: 30px; border: 1px solid currentColor; display: grid; place-items: center; font-size: 15px; letter-spacing: 0; opacity: 0.9; }
.nav { display: flex; gap: 18px; margin-left: auto; }
.nav a { color: var(--brand-ink); opacity: 0.75; text-decoration: none; font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; }
.nav a:hover, .nav a[aria-current] { opacity: 1; }
@media (max-width: 640px) { .nav { gap: 12px; } .nav a { font-size: 0.85rem; } .nav .hide-sm { display: none; } }

/* blocks */
.hero { padding: 64px 0 40px; }
.hero p.lead { font-size: 1.2rem; color: var(--sub); max-width: 620px; }
.eyebrow { font-size: 0.74rem; font-weight: 500; letter-spacing: 0.22em; text-transform: uppercase; color: var(--sub); margin-bottom: 14px; }
section { padding: 32px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.grid { display: grid; gap: 14px; }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
a.card { display: block; color: inherit; text-decoration: none; transition: transform 0.12s ease, border-color 0.12s ease; }
a.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card h3 { margin-bottom: 4px; }
.muted { color: var(--sub); }
.small { font-size: 0.875rem; }
.tag { display: inline-block; font-size: 0.7rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; padding: 4px 8px; border-radius: 2px; background: var(--accent-soft); color: var(--accent); }
.tag.new { background: var(--warn-soft); color: var(--warn); }
.tag.warn { background: var(--warn-soft); color: var(--warn); }
.tag.danger { background: var(--danger-soft); color: var(--danger); }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 22px; border-radius: 2px; background: var(--accent); color: var(--accent-ink); font-weight: 500; letter-spacing: 0.04em; text-decoration: none; border: 1px solid var(--accent); font-size: 0.95rem; cursor: pointer; }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btns { display: flex; gap: 10px; flex-wrap: wrap; }
.note { border-radius: var(--radius); padding: 12px 14px; background: var(--warn-soft); color: var(--warn); font-size: 0.92rem; }
.note.danger { background: var(--danger-soft); color: var(--danger); }
.note.plain { background: var(--accent-soft); color: var(--ink); }

/* tool layout */
.tool { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
@media (max-width: 820px) { .tool { grid-template-columns: minmax(0, 1fr); } }
.field { margin-bottom: 14px; }
.field label, .label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--sub); margin-bottom: 6px; }
.input { display: flex; align-items: center; background: var(--field); border: 1px solid var(--line); border-radius: var(--radius); }
.input:focus-within { border-color: var(--accent); }
.input input, .input select { flex: 1; min-width: 0; border: 0; background: transparent; color: var(--ink); font: inherit; font-size: 1.05rem; padding: 11px 12px; outline: none; }
.input span { padding-right: 12px; color: var(--sub); }
.row { display: flex; flex-wrap: wrap; gap: 10px; }
.row > * { flex: 1 1 140px; min-width: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.chip { border: 1px solid var(--line); background: var(--card); color: var(--ink); border-radius: 2px; padding: 4px 10px; font-size: 0.85rem; cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.chip.on { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
[hidden] { display: none !important; }
.seg { display: flex; background: color-mix(in srgb, var(--line) 70%, var(--bg)); border-radius: var(--radius); padding: 3px; }
.seg button { flex: 1; border: 0; background: transparent; color: var(--sub); padding: 8px; border-radius: 4px; font: inherit; font-size: 0.92rem; cursor: pointer; }
.seg button[aria-pressed='true'] { background: var(--card); color: var(--ink); font-weight: 600; box-shadow: var(--shadow); }
.result-big { font-family: var(--serif); font-size: 3.6rem; font-weight: 500; line-height: 1; margin: 6px 0; }
.result-big small { font-family: var(--sans); font-size: 1rem; color: var(--sub); font-weight: 400; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin: 14px 0; }
.stat { background: var(--field); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; }
.stat b { display: block; font-family: var(--serif); font-size: 1.55rem; font-weight: 500; }
.stat span { font-size: 0.8rem; color: var(--sub); }

/* syringe */
.syringe { margin: 18px 0 6px; }
.syringe svg { width: 100%; height: auto; display: block; }

/* tables */
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { color: var(--sub); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.table-wrap { overflow-x: auto; }
details.working { margin-top: 14px; }
details.working summary { cursor: pointer; font-weight: 600; color: var(--accent); }

/* article */
.prose h2 { margin-top: 1.6em; }
.prose ul { padding-left: 1.2em; }
.prose li { margin-bottom: 0.4em; }
.crumbs { font-size: 0.85rem; color: var(--sub); margin: 24px 0 8px; }
.crumbs a { color: var(--sub); }

/* footer */
footer { margin-top: 48px; border-top: 1px solid var(--line); padding: 32px 0 48px; color: var(--sub); font-size: 0.9rem; }
footer .cols { display: flex; flex-wrap: wrap; gap: 32px; justify-content: space-between; }
footer a { color: var(--sub); text-decoration: none; display: block; margin-bottom: 6px; }
footer a:hover { color: var(--ink); }

/* phone mockup on home */
.phone { width: 260px; max-width: 100%; margin: 0 auto; border-radius: 36px; border: 8px solid var(--brand); background: var(--bg); padding: 18px 14px; box-shadow: var(--shadow); }
.phone .next { background: var(--brand); color: var(--brand-ink); border-radius: 8px; padding: 14px; }
.phone .next b { font-family: var(--serif); font-weight: 500; font-size: 1.6rem; display: block; }
.phone .rowi { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 0.85rem; }
.hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 32px; align-items: center; }
@media (max-width: 820px) { .hero-grid { grid-template-columns: 1fr; } }

@media print {
  .top, footer, .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  .card { box-shadow: none; border-color: #bbb; }
  .tool { grid-template-columns: 1fr; }
}