:root {
  --font-display: "Archivo", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  --paper: #EEF1F5; --surface: #FFFFFF; --ink: #111B26; --ink-soft: #485667;
  --rule: #C8D0DA; --grid: #D9DFE7; --accent: #2A4BA0; --accent-ink: #FFFFFF; --accent-soft: #DCE4F6;
  --b0: #B3372B; --b0-bg: #F7DDD9; --b1: #8A5C00; --b1-bg: #F6E7C2;
  --b2: #2B6B3C; --b2-bg: #D8ECDC; --b3: #0A6870; --b3-bg: #CFEAEC;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0E151D; --surface: #17212C; --ink: #E8EDF3; --ink-soft: #A4B0BF;
    --rule: #2C3A4A; --grid: #243140; --accent: #7F9BE0; --accent-ink: #0E151D; --accent-soft: #1F2D4D;
    --b0: #F0928A; --b0-bg: #3A1E1B; --b1: #E3B552; --b1-bg: #3A2D12;
    --b2: #7CC68F; --b2-bg: #17301F; --b3: #6CC4CC; --b3-bg: #113034;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.55 var(--font-body);
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
a { color: var(--accent); }
.top { max-width: 780px; margin: 0 auto; padding: 14px 16px; display: flex; align-items: center; gap: 10px; }
.top img { width: 26px; height: 26px; border-radius: 4px; }
.top a { color: var(--ink); text-decoration: none; font: 700 15px var(--font-display); letter-spacing: .02em; }
main { max-width: 780px; margin: 0 auto; padding: 0 16px 24px; }
footer { max-width: 780px; margin: 0 auto; padding: 8px 16px 40px; color: var(--ink-soft); font-size: 13px; display: flex; flex-wrap: wrap; gap: 6px 16px; }
.panel { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 20px; margin: 0 0 14px; }
h1, h2 { font-family: var(--font-display); font-stretch: 90%; line-height: 1.15; margin: 6px 0 10px; letter-spacing: -.01em; }
h1 { font-size: 30px; font-weight: 800; }
h2 { font-size: 21px; font-weight: 700; }
h1:focus, h2:focus { outline: none; }
.mono { font: 500 12px var(--font-mono); letter-spacing: .08em; color: var(--accent); margin: 0; }
.lead { font-size: 17px; }
.soft { color: var(--ink-soft); margin: 4px 0; }
.small { font-size: 13px; }
.hint { font-size: 13px; color: var(--ink-soft); margin: 10px 0 0; min-height: 1em; }
.err { color: var(--b0); font-size: 14px; margin: 6px 0 0; min-height: 1em; }
.row { display: flex; gap: 10px; margin-top: 18px; }
.row.wrap { flex-wrap: wrap; }
.btn {
  appearance: none; border: 1px solid var(--rule); background: transparent; color: var(--ink);
  font: 600 16px var(--font-body); padding: 12px 18px; border-radius: 4px; cursor: pointer; text-decoration: none;
  min-height: 46px; display: inline-flex; align-items: center; justify-content: center; text-align: center;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); flex: 1; }
.btn.small { min-height: 38px; padding: 8px 14px; font-size: 14px; }
.btn[disabled] { opacity: .4; cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.install { margin-top: 14px; }
.field { margin: 18px 0 0; }
label { font-weight: 600; font-size: 14px; }
.field label, .form label:not(.check) { display: block; margin-bottom: 4px; }
input[type=text], input[type=email], select {
  width: 100%; font: inherit; padding: 12px; min-height: 46px; border: 1px solid var(--rule); border-radius: 4px; background: var(--surface); color: var(--ink);
}
.check { display: flex; gap: 10px; align-items: flex-start; margin-top: 16px; font-weight: 400; font-size: 14px; }
.check input { width: 20px; height: 20px; margin-top: 2px; flex: none; }
.trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.dim { display: flex; gap: 14px; padding: 12px 0; border-top: 1px solid var(--grid); }
.dim:first-of-type { border-top: 0; }
.letter { flex: none; width: 30px; height: 30px; border-radius: 4px; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font: 700 14px var(--font-mono); }
.dim p { margin: 2px 0 0; }
.progress { height: 5px; background: var(--grid); margin: 0 0 14px; }
.progress .bar { height: 100%; background: var(--accent); transition: width .25s; }
.legend { font-size: 13px; color: var(--ink-soft); margin: 14px 0 0; }
fieldset.q { border: 0; padding: 0; margin: 20px 0 0; min-width: 0; }
fieldset.q legend { font-weight: 600; padding: 0; margin-bottom: 10px; }
.opts { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.opts input { position: absolute; opacity: 0; pointer-events: none; }
.opts label { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; border: 1px solid var(--rule); border-radius: 4px; padding: 10px 2px; min-height: 60px; cursor: pointer; background: var(--paper); text-align: center; font-weight: 400; }
.opts .n { font: 600 17px var(--font-mono); }
.opts .l { font-size: 10px; line-height: 1.15; color: var(--ink-soft); }
.opts input:checked + label { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.opts input:checked + label .l { color: var(--accent-ink); }
.opts input:focus-visible + label { outline: 3px solid var(--accent); outline-offset: 2px; }
.meters { display: grid; gap: 14px; grid-template-columns: 1fr; margin-bottom: 14px; }
.meter { background: var(--surface); border: 1px solid var(--rule); border-radius: 4px; padding: 16px 18px; }
.mhead { display: flex; justify-content: space-between; align-items: center; font: 500 12px var(--font-mono); text-transform: uppercase; letter-spacing: .06em; color: var(--ink-soft); }
.mval { font: 800 46px var(--font-display); line-height: 1.1; margin: 6px 0 8px; }
.chip { font: 500 12px var(--font-mono); padding: 2px 8px; border-radius: 3px; text-transform: none; letter-spacing: 0; white-space: nowrap; }
.chip.b0 { background: var(--b0-bg); color: var(--b0); } .chip.b1 { background: var(--b1-bg); color: var(--b1); }
.chip.b2 { background: var(--b2-bg); color: var(--b2); } .chip.b3 { background: var(--b3-bg); color: var(--b3); }
.track { position: relative; height: 9px; background: var(--grid); }
.fill { height: 100%; background: var(--b2); }
.fill.b0 { background: var(--b0); } .fill.b1 { background: var(--b1); } .fill.b2 { background: var(--b2); } .fill.b3 { background: var(--b3); }
.std { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--ink); }
.note { border-left: 4px solid var(--b1); }
.split { display: grid; gap: 14px; grid-template-columns: 1fr; align-items: center; margin-top: 8px; }
.radar { width: 100%; max-width: 340px; margin: 0 auto; }
.radar .ring, .radar .spoke { fill: none; stroke: var(--grid); stroke-width: 1; }
.radar .stdring { fill: none; stroke: var(--ink); stroke-width: 1; stroke-dasharray: 4 3; opacity: .6; }
.radar .rlab { fill: var(--ink-soft); font: 500 11px var(--font-mono); }
.radar .shape { fill: color-mix(in srgb, var(--accent) 22%, transparent); stroke: var(--accent); stroke-width: 2; }
.radar .dot { fill: var(--accent); }
.drow { margin: 14px 0; }
.dtop { display: flex; justify-content: space-between; gap: 8px; align-items: center; font-size: 14px; margin-bottom: 6px; }
.gap { border-top: 1px solid var(--grid); padding-top: 14px; margin-top: 16px; }
.gtop { display: flex; gap: 12px; align-items: center; }
.symptom { color: var(--ink-soft); font-style: italic; margin: 8px 0 0; }
.gh { font: 500 11px var(--font-mono); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); margin: 14px 0 2px; }
.gap p { margin: 2px 0; }
.gap ul, .panel > ul { margin: 4px 0 0; padding-left: 20px; }
@media (min-width: 640px) {
  .meters { grid-template-columns: repeat(3, 1fr); }
  .split { grid-template-columns: 340px 1fr; }
  .opts .l { font-size: 12px; }
  h1 { font-size: 38px; }
}
@media print {
  body { background: #fff; color: #000; }
  .top, .btn, .install, .row, footer { display: none !important; }
  .panel, .meter { break-inside: avoid; border-color: #aaa; }
}