:root {
  color-scheme: light;
  --background: #f5f3ef;
  --panel: #fffefa;
  --ink: #26332d;
  --muted: #69736b;
  --line: #dce1d7;
  --warm: #f8e8d9;
  --accent: #9c4427;
  --accent-fill: #b95b36;
  --selected: #2c4335;
  --error: #a42c23;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--background);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; font-size: 14px; line-height: 1.5; }
button, input, select { font: inherit; }
button, select, input[type="range"] { cursor: pointer; }
button, input, select { -webkit-tap-highlight-color: transparent; }
button { color: inherit; }
button:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible, a:focus-visible { outline: 3px solid #a54e2c; outline-offset: 4px; }
a { color: var(--accent); text-underline-offset: 3px; }
input, select { min-width: 0; color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: 8px; }
input[type="number"] { width: 92px; padding: 8px 9px; text-align: right; font-variant-numeric: tabular-nums; }
input[aria-invalid="true"] { border-color: var(--error); }
select { max-width: 100%; padding: 9px 30px 9px 11px; font-size: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: absolute; z-index: 10; top: 10px; left: 16px; padding: 10px 14px; border-radius: 8px; background: var(--selected); color: white; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { max-width: 1440px; margin: auto; display: flex; align-items: center; gap: 20px; min-height: 85px; padding: 18px 42px; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 550; font-size: 19px; letter-spacing: -.65px; }
.brand-mark { display: grid; place-items: center; width: 35px; height: 35px; border-radius: 10px; color: #f5f7f0; background: var(--selected); }
.brand-mark svg { width: 22px; height: 22px; }
.header-note { margin: 0 0 0 auto; color: var(--muted); font-size: 12px; }
.main { max-width: 1056px; margin: auto; padding: 41px 28px 0; }
.main:focus { outline: none; }
.eyebrow { margin: 0 0 8px; color: var(--accent); font-size: 11px; font-weight: 650; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0 0 9px; font-size: clamp(29px, 4vw, 35px); line-height: 1.14; font-weight: 550; letter-spacing: -1.25px; }
.intro-copy { margin: 0 0 28px; color: var(--muted); font-size: 14px; }
.calculator-grid { display: grid; grid-template-columns: minmax(0, 1.04fr) minmax(0, 1fr); gap: 23px; align-items: stretch; }
.controls { min-width: 0; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); padding: 23px; box-shadow: 0 2px 2px #26332d02; }
.direction-control { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; margin-bottom: 23px; background: var(--background); border-radius: 11px; }
.direction-control button { padding: 11px 6px; min-height: 43px; border: 0; border-radius: 8px; background: transparent; font-weight: 550; font-size: 13px; transition: background-color 120ms ease, color 120ms ease; }
.direction-control button span { display: inline-block; margin: 0 3px; }
.direction-control button[aria-pressed="true"] { background: var(--selected); color: #fffefa; box-shadow: 0 1px 2px #26332d12; }
.direction-control button:hover[aria-pressed="false"] { background: #e9ece4; }
.source-field > label { display: block; margin: 0 0 10px; font-weight: 550; }
.source-input { display: flex; align-items: center; gap: 12px; padding: 10px 14px; border: 1px solid var(--line); border-radius: 11px; background: var(--panel); }
.source-input:focus-within { outline: 3px solid #a54e2c; outline-offset: 3px; }
.source-input:has(input[aria-invalid="true"]) { border-color: var(--error); }
.source-input input { width: 100%; min-width: 0; padding: 0; border: 0; border-radius: 0; background: transparent; outline: none; text-align: left; font-size: 31px; line-height: 1.3; letter-spacing: -.75px; }
.source-input input:focus-visible { outline: none; }
.unit { flex: 0 0 auto; color: var(--muted); font-size: 13px; white-space: nowrap; }
.source-input .unit { font-size: 15px; }
.divider { height: 1px; margin: 23px 0 20px; background: var(--line); }
.small-heading { display: flex; align-items: center; gap: 7px; margin: 0 0 18px; font-size: 11px; font-weight: 600; letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
.small-heading svg { width: 16px; height: 16px; }
.nozzle-field { margin-bottom: 21px; padding-bottom: 17px; border-bottom: 1px solid var(--line); }
.nozzle-row, .nozzle-custom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.nozzle-row > label, .field-top > label { font-weight: 550; }
.nozzle-custom { margin-top: 12px; }
.nozzle-custom > label { color: var(--muted); font-size: 12px; }
.number-wrap { display: flex; align-items: center; flex: 0 0 auto; gap: 7px; }
.nozzle-suggestion { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; margin-top: 12px; font-size: 11px; color: var(--muted); }
.suggestion-button { padding: 7px 9px; min-height: 32px; border: 1px solid #cfd7ca; border-radius: 7px; background: transparent; color: var(--ink); font-size: 11px; transition: background-color 120ms ease; }
.suggestion-button:hover:enabled { background: #edf0e8; }
.suggestion-button:disabled { color: #7a8178; cursor: default; border-color: var(--line); background: #f7f7f2; }
.field-hint { margin: 8px 0 0; color: var(--muted); font-size: 11px; }
.geometry-field + .geometry-field { margin-top: 19px; }
.field-top { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 8px; }
input[type="range"] { display: block; width: 100%; height: 25px; margin: 0; padding: 0; accent-color: var(--selected); background: transparent; border: 0; }
.range-labels { display: flex; justify-content: space-between; color: var(--muted); font-size: 10px; font-variant-numeric: tabular-nums; margin-top: 1px; }
.exact-hint { margin: 13px 0 0; color: var(--muted); font-size: 11px; }
.model-field { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 9px; padding-top: 17px; margin-top: 17px; border-top: 1px solid var(--line); }
.model-field label { color: var(--muted); font-size: 12px; }
.calculation-error, .field-error { color: var(--error); font-size: 12px; }
.calculation-error { margin: 15px 0 0; }
.field-error { margin: 10px 0 0; }
.result-panel { display: flex; flex-direction: column; min-width: 0; padding: 27px; border: 1px solid #eddaca; border-radius: 18px; background: var(--warm); position: relative; overflow: hidden; }
.result-label { display: flex; align-items: center; gap: 8px; margin: 0; font-size: 14px; line-height: 1.4; font-weight: 550; }
.result-label svg { flex: 0 0 auto; width: 21px; height: 21px; color: var(--accent); }
.result-reading { display: flex; align-items: baseline; flex-wrap: wrap; gap: 12px; margin: 29px 0 0; }
.result-value { max-width: 100%; overflow-wrap: anywhere; font-size: clamp(48px, 6.4vw, 78px); line-height: 1; letter-spacing: -4px; font-weight: 500; font-variant-numeric: tabular-nums; }
.result-unit { color: var(--accent); font-size: 20px; letter-spacing: -.3px; }
.result-context { margin: 15px 0 27px; color: #6c7063; font-size: 12px; }
.bead-preview { margin-top: auto; padding-top: 24px; border-top: 1px solid #d9bca680; }
.bead-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; color: #686e60; font-size: 11px; font-variant-numeric: tabular-nums; }
.bead-heading h3 { margin: 0; font-size: 10px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.bead-svg { display: block; width: 100%; max-width: 340px; height: auto; margin: 28px auto 12px; overflow: visible; }
.bead-shape { fill: var(--accent-fill); }
.bead-baseline { stroke: #727766; stroke-width: 1; opacity: .35; }
.bead-dimension { stroke: #747664; stroke-width: 1; fill: none; }
.bead-text { fill: #686e60; font-family: ui-sans-serif, system-ui, sans-serif; font-size: 11px; font-variant-numeric: tabular-nums; }
.bead-caption { margin: 0; max-width: 30ch; color: #686e60; font-size: 12px; line-height: 1.6; }
.result-foot { display: flex; align-items: center; gap: 7px; margin-top: 26px; color: #797764; font-size: 10px; letter-spacing: .01em; }
.result-foot-dot { width: 5px; height: 5px; border-radius: 50%; background: #9a8263; }
.scope-note { display: flex; align-items: flex-start; gap: 7px; margin: 18px 0 27px; color: var(--muted); font-size: 11px; }
.scope-note svg { flex: 0 0 auto; width: 16px; height: 16px; }
.help { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.help summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 17px 0; cursor: pointer; list-style: none; color: #505e52; font-size: 12px; font-weight: 550; }
.help summary::-webkit-details-marker { display: none; }
.help summary > span { font-size: 19px; line-height: 1; font-weight: 400; color: var(--muted); }
.help[open] summary > span { transform: rotate(45deg); }
.help-content { max-width: 76ch; padding: 0 0 19px; color: var(--muted); font-size: 12px; line-height: 1.75; }
.help-content p { margin: 0 0 12px; }
.help-content p:last-child { margin-bottom: 0; }
.help-content strong { color: #505e52; font-weight: 600; }
.help-content code { font-size: 12px; color: #4d5c4f; }
.equations { display: flex; flex-wrap: wrap; gap: 12px; margin: 15px 0; }
.equations p { display: flex; align-items: baseline; gap: 16px; border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; margin: 0; background: #eeeee7; }
.equations p span { font-size: 11px; }
.help-sources { font-size: 11px; }
.site-footer { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; padding: 19px 0 26px; color: #778074; font-size: 10px; }
.site-footer > span:first-child { color: #64715f; font-weight: 550; }
.noscript-note { color: var(--error); border: 1px solid var(--line); border-radius: 8px; padding: 12px; }

@media (min-width: 1200px) {
  .main { padding-top: 49px; }
  .intro-copy { margin-bottom: 31px; }
}
@media (max-width: 700px) {
  .site-header { min-height: 74px; padding: 17px 22px; }
  .main { padding: 30px 20px 0; }
  .header-note { font-size: 10px; max-width: 18ch; text-align: right; }
  .calculator-grid { grid-template-columns: 1fr; gap: 17px; }
  .controls { padding: 21px; }
  .result-panel { padding: 24px; }
  .result-reading { margin-top: 22px; }
  .result-value { font-size: 70px; }
  .bead-preview { margin-top: 0; padding-top: 19px; }
  .bead-svg { max-width: 340px; margin-top: 21px; margin-bottom: 2px; }
  .bead-caption { max-width: 100%; }
  .result-foot { margin-top: 19px; }
  .scope-note { margin-bottom: 23px; }
}
@media (max-width: 380px) {
  .site-header { padding: 16px; }
  .header-note { display: none; }
  .main { padding: 26px 14px 0; }
  .controls { padding: 17px; }
  .result-panel { padding: 21px; }
  h1 { font-size: 29px; }
  .intro-copy { max-width: 31ch; }
  .result-value { font-size: 64px; }
  .field-top { gap: 7px; }
  input[type="number"] { width: 83px; }
  .source-input input { width: 100%; }
  .nozzle-suggestion { gap: 10px; }
  .site-footer { font-size: 9px; }
}
@media (pointer: coarse) {
  input[type="number"], select { min-height: 44px; font-size: 16px; }
  input[type="range"] { height: 35px; }
  .direction-control button { min-height: 44px; }
  .suggestion-button { min-height: 44px; font-size: 12px; }
  .source-input input { font-size: 31px; }
  .help summary { min-height: 48px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; }
}