:root {
  --bg: #f3f6f7;
  --card: #ffffff;
  --ink: #16202a;
  --muted: #5b6b78;
  --line: #dfe6ea;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #d9f1ee;
  --fill: #4fb3aa;
  --warn-bg: #fff6e0;
  --warn-ink: #7a4d00;
  --error-bg: #fde8e8;
  --error-ink: #8f1d1d;
  --info-bg: #e8f1fb;
  --info-ink: #1e4d7a;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 32, 42, 0.06), 0 6px 20px rgba(16, 32, 42, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1418;
    --card: #17202a;
    --ink: #e8eef2;
    --muted: #96a5b1;
    --line: #2a3640;
    --accent: #2dd4bf;
    --accent-ink: #062521;
    --accent-soft: #123b37;
    --fill: #2dd4bf;
    --warn-bg: #3a2c0d;
    --warn-ink: #f6d58a;
    --error-bg: #3f1717;
    --error-ink: #f7a5a5;
    --info-bg: #14283d;
    --info-ink: #9cc6f0;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.45;
  color: var(--ink);
  background: var(--bg);
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.app-header { max-width: 560px; margin: 0 auto; padding: 22px 18px 6px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.brand-mark { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 6px; background: var(--accent); color: var(--accent-ink); font-weight: 800; letter-spacing: 0; }
h1 { margin: 8px 0 2px; font-size: 26px; line-height: 1.2; }
.sub { margin: 0; color: var(--muted); }

main { max-width: 560px; margin: 0 auto; padding: 10px 14px 24px; display: grid; gap: 14px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 16px; }
.card h2 { margin: 0 0 2px; font-size: 17px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

.field { display: grid; gap: 6px; margin-bottom: 16px; }
.field:last-child { margin-bottom: 0; }
fieldset.field { border: 0; padding: 0; margin: 0 0 16px; min-width: 0; }
label, legend { font-weight: 600; font-size: 14px; }
.unit { font-weight: 500; color: var(--muted); margin-left: 4px; }
.hint { font-size: 13px; color: var(--muted); }

input[type="number"], select {
  width: 100%;
  font: inherit;
  font-size: 18px;
  color: var(--ink);
  background: var(--card);
  border: 1.5px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input[type="number"]:focus, select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
input[type="number"] { -moz-appearance: textfield; }
input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips:empty { display: none; }
.chip {
  font: inherit; font-size: 13px; font-weight: 600;
  color: var(--accent); background: var(--accent-soft);
  border: 0; border-radius: 999px; padding: 5px 11px; cursor: pointer;
}
.chip[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }

.segmented { display: grid; grid-template-columns: 1fr 1fr; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 3px; gap: 3px; }
.segmented label { position: relative; cursor: pointer; margin: 0; }
.segmented input { position: absolute; opacity: 0; inset: 0; }
.segmented span { display: block; text-align: center; padding: 8px 6px; border-radius: 8px; font-size: 14px; font-weight: 600; color: var(--muted); }
.segmented input:checked + span { background: var(--card); color: var(--ink); box-shadow: 0 1px 2px rgba(0,0,0,0.12); }
.segmented input:focus-visible + span { outline: 2px solid var(--accent); }

details.options summary { cursor: pointer; font-size: 14px; font-weight: 600; color: var(--muted); }
details.options[open] summary { margin-bottom: 12px; }

/* Result card */
.result { border-color: var(--accent); }
.result .empty { color: var(--muted); margin: 0; }
.primary { text-align: center; padding: 4px 0 10px; }
.primary .label { font-size: 14px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.primary .big { font-size: 52px; font-weight: 800; line-height: 1.05; color: var(--accent); letter-spacing: -0.02em; }
.primary .big small { font-size: 22px; font-weight: 600; margin-left: 4px; }
.primary .note { color: var(--muted); font-size: 15px; margin-top: 2px; }
.secondary { text-align: center; font-size: 15px; margin: 4px 0 8px; }
.secondary b { color: var(--ink); }

.syringe { display: block; width: 100%; height: auto; margin: 6px 0 10px; }
.syringe .barrel { fill: none; stroke: var(--muted); stroke-width: 2; }
.syringe .needle { stroke: var(--muted); stroke-width: 2; }
.syringe .fill { fill: var(--fill); opacity: 0.55; }
.syringe .stopper { fill: var(--ink); }
.syringe .rod { stroke: var(--muted); stroke-width: 6; stroke-linecap: round; }
.syringe .tick { stroke: var(--ink); stroke-width: 1; }
.syringe .tick.major { stroke-width: 1.5; }
.syringe .tick-label { font-size: 9px; fill: var(--muted); text-anchor: middle; }
.syringe .marker { stroke: var(--accent); stroke-width: 2; stroke-dasharray: 3 2; }
.syringe .marker-label { font-size: 11px; font-weight: 700; fill: var(--accent); text-anchor: middle; }
.syringe .overflow { fill: var(--error-ink); font-size: 11px; font-weight: 700; text-anchor: end; }

.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 14px; margin: 8px 0 0; padding: 12px 0 0; border-top: 1px solid var(--line); }
.stats div { display: grid; gap: 1px; }
.stats dt { font-size: 12px; font-weight: 600; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }
.stats dd { margin: 0; font-size: 17px; font-weight: 600; }
.stats dd span { font-weight: 500; color: var(--muted); font-size: 14px; }

.warnings { list-style: none; margin: 12px 0 0; padding: 0; display: grid; gap: 8px; }
.warnings li { padding: 9px 12px; border-radius: 10px; font-size: 14px; }
.warnings li.info  { background: var(--info-bg);  color: var(--info-ink); }
.warnings li.warn  { background: var(--warn-bg);  color: var(--warn-ink); }
.warnings li.error { background: var(--error-bg); color: var(--error-ink); }
.errors { margin: 0; padding-left: 18px; color: var(--muted); }

/* Ladder table */
.table-wrap { overflow-x: auto; margin-top: 8px; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 9px 8px; border-bottom: 1px solid var(--line); }
th { font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); }
td:nth-child(2) { font-weight: 700; }
tr.target td { background: var(--accent-soft); }
tr.target td:first-child { border-radius: 8px 0 0 8px; }
tr.target td:last-child { border-radius: 0 8px 8px 0; }
tr.nofit td { color: var(--error-ink); }
tr.nofit td:nth-child(2)::after { content: " ⚠"; }

footer { max-width: 560px; margin: 0 auto; padding: 4px 18px 40px; font-size: 14px; color: var(--muted); }
footer p { margin: 6px 0; }