@font-face { font-family: "Archivo"; font-style: normal; font-weight: 400 800; font-stretch: 62% 125%; font-display: swap;
  src: url(fonts/archivo-latin.woff2) format("woff2"); }
@font-face { font-family: "Martian Mono"; font-style: normal; font-weight: 400 600; font-stretch: 75% 100%; font-display: swap;
  src: url(fonts/martian-mono-latin.woff2) format("woff2"); }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; }
img { max-width: 100%; }
[hidden] { display: none !important; }
footer a { color: inherit; }
/* Layout: one work surface (a paper-like drop tray with the size choice under it, results as receipt slips beside it), then a plain-reading explainer column. */
:root {
  --paper: #f2f4f7;
  --sheet: #ffffff;
  --ink: #14223d;
  --ink-soft: #56617a;
  --rule: #d5dbe5;
  --marker: #ffe45a;
  --marker-ink: #14223d;
  --focus: #2f6bff;
  --good: #0b7a4e;
  --bad: #b42318;
  --shadow: 0 1px 0 rgba(20, 34, 61, .06), 0 10px 30px -18px rgba(20, 34, 61, .35);
  --font-display: "Archivo", "Arial Narrow", system-ui, sans-serif;
  --font-body: "Archivo", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-data: "Martian Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --step--1: .8125rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: 1.5rem;
  --step-4: clamp(2.4rem, 1.4rem + 4.2vw, 4.4rem);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0e1525; --sheet: #161f33; --ink: #e8ecf4; --ink-soft: #a2acc1; --rule: #2a3550;
    --marker: #f4dc4f; --marker-ink: #14223d; --focus: #7ea4ff; --good: #4fd1a1; --bad: #ff8f85;
    --shadow: 0 1px 0 rgba(0, 0, 0, .3), 0 14px 34px -20px rgba(0, 0, 0, .8);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0e1525; --sheet: #161f33; --ink: #e8ecf4; --ink-soft: #a2acc1; --rule: #2a3550;
  --marker: #f4dc4f; --marker-ink: #14223d; --focus: #7ea4ff; --good: #4fd1a1; --bad: #ff8f85;
  --shadow: 0 1px 0 rgba(0, 0, 0, .3), 0 14px 34px -20px rgba(0, 0, 0, .8);
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.55;
  font-variation-settings: "wdth" 100;
}
.wrap { max-width: 72rem; margin: 0 auto; padding-inline: max(16px, 3vw); padding-block: 0 4rem; }

header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding-block: 1.25rem;
  border-bottom: 1px solid var(--rule);
}
.mark { display: flex; align-items: baseline; gap: .55rem; font-family: var(--font-display); font-weight: 750; font-size: var(--step-1); letter-spacing: -.01em; }
.mark span { font-variation-settings: "wdth" 62; font-weight: 600; color: var(--ink-soft); letter-spacing: .02em; text-transform: uppercase; font-size: var(--step--1); }
.badges { display: flex; flex-wrap: wrap; gap: .4rem 1rem; font-family: var(--font-data); font-size: .72rem; color: var(--ink-soft); }
.badges b { color: var(--ink); font-weight: 600; }

.hero { padding-block: 2.6rem 1.6rem; display: grid; gap: .8rem; }
h1 {
  font-family: var(--font-display); font-size: var(--step-4); line-height: .95; margin: 0;
  font-weight: 800; letter-spacing: -.025em; text-wrap: balance; font-variation-settings: "wdth" 112;
}
h1 .squeezed { font-variation-settings: "wdth" 62; letter-spacing: -.01em; display: inline-block; transition: font-variation-settings 900ms cubic-bezier(.2,.8,.2,1); }
h1 .squeezed.wide { font-variation-settings: "wdth" 125; }
.lede { max-width: 40rem; color: var(--ink-soft); font-size: var(--step-1); margin: 0; text-wrap: pretty; }

.work { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 1.5rem; align-items: start; }
@media (max-width: 860px) { .work { grid-template-columns: minmax(0, 1fr); } }

.tray {
  position: relative; display: grid; place-items: center; text-align: center;
  min-height: 19rem; padding: 2rem 1.25rem;
  background: var(--sheet); border: 2px dashed var(--rule); border-radius: 6px;
  transition: border-color .15s, background .15s;
}
.tray.over { border-color: var(--ink); background: color-mix(in srgb, var(--marker) 22%, var(--sheet)); }
.tray:focus-within { border-color: var(--focus); }
.stack { width: 5.2rem; height: 6.6rem; position: relative; margin: 0 auto 1.1rem; }
.stack i { position: absolute; inset: 0; border: 1.5px solid var(--ink); border-radius: 3px; background: var(--sheet); }
.stack i:nth-child(1) { transform: translate(10px, -8px) rotate(5deg); opacity: .45; }
.stack i:nth-child(2) { transform: translate(5px, -4px) rotate(2.5deg); opacity: .7; }
.stack i:nth-child(3) { display: grid; place-items: center; font-family: var(--font-data); font-size: .7rem; font-weight: 600; letter-spacing: .08em; }
.tray h2 { font-family: var(--font-display); font-size: var(--step-2); margin: 0 0 .25rem; font-weight: 700; font-variation-settings: "wdth" 100; }
.tray p { margin: 0 0 1.1rem; color: var(--ink-soft); }
.btn {
  appearance: none; border: 1.5px solid var(--ink); background: var(--ink); color: var(--paper);
  font: inherit; font-weight: 650; padding: .62rem 1.15rem; border-radius: 4px; cursor: pointer;
  display: inline-flex; align-items: center; gap: .5rem; text-decoration: none;
}
.btn:hover { filter: brightness(1.12); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: color-mix(in srgb, var(--ink) 8%, transparent); filter: none; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
:where(button, input, a, summary):focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
#file-input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.tray-actions { display: flex; gap: .6rem; flex-wrap: wrap; justify-content: center; }
.tray small { display: block; margin-top: 1rem; color: var(--ink-soft); font-size: var(--step--1); }

fieldset.levels { border: 0; padding: 0; margin: 1.25rem 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .5rem; }
@media (max-width: 520px) { fieldset.levels { grid-template-columns: minmax(0, 1fr); } }
fieldset.levels legend { font-weight: 650; margin-bottom: .5rem; font-size: var(--step--1); text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); }
.level { position: relative; display: grid; gap: .15rem; padding: .7rem .8rem; background: var(--sheet); border: 1.5px solid var(--rule); border-radius: 4px; cursor: pointer; }
.level input { position: absolute; opacity: 0; }
.level strong { font-size: .98rem; }
.level span { font-size: var(--step--1); color: var(--ink-soft); line-height: 1.35; }
.level em { font-style: normal; font-family: var(--font-data); font-size: .7rem; color: var(--ink); }
.level:has(input:checked) { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.level:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }

.results { display: grid; gap: .9rem; }
.results-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; }
.results-head h2 { margin: 0; font-family: var(--font-display); font-size: var(--step-1); font-weight: 700; }
.results-head p { margin: 0; color: var(--ink-soft); font-size: var(--step--1); }

.slip {
  background: var(--sheet); border-radius: 4px; box-shadow: var(--shadow);
  padding: 1rem 1.1rem 1.1rem; display: grid; gap: .7rem; position: relative;
  border-top: 3px solid var(--ink);
}
.slip.example { border-top-style: dashed; }
.slip-top { display: flex; justify-content: space-between; gap: .75rem; align-items: start; }
.slip-name { font-weight: 650; overflow-wrap: anywhere; min-width: 0; }
.tag { font-family: var(--font-data); font-size: .66rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft); border: 1px solid var(--rule); padding: .1rem .4rem; border-radius: 3px; white-space: nowrap; }
.figures { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: .35rem .75rem; align-items: center; font-family: var(--font-data); font-size: .8rem; font-variant-numeric: tabular-nums; }
.figures dt { color: var(--ink-soft); }
.figures dd { margin: 0; text-align: right; }
.bar { height: .55rem; background: color-mix(in srgb, var(--ink) 10%, transparent); border-radius: 2px; overflow: hidden; }
.bar b { display: block; height: 100%; background: var(--ink); border-radius: 2px; transition: width .6s cubic-bezier(.2,.8,.2,1); }
.bar.after b { background: var(--marker); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--ink) 35%, transparent); }
.verdict { display: flex; justify-content: space-between; align-items: center; gap: .75rem; flex-wrap: wrap; border-top: 1px dashed var(--rule); padding-top: .7rem; }
.saved { font-family: var(--font-display); font-weight: 800; font-size: var(--step-2); line-height: 1; font-variation-settings: "wdth" 75; }
.saved mark { background: var(--marker); color: var(--marker-ink); padding: 0 .2em; border-radius: 2px; }
.fine { font-family: var(--font-data); font-size: .7rem; color: var(--ink-soft); }
.progress { display: grid; gap: .35rem; }
.progress .bar b { background: var(--ink); }
.progress .stage { font-size: var(--step--1); color: var(--ink-soft); display: flex; justify-content: space-between; gap: 1rem; font-variant-numeric: tabular-nums; }
.msg { font-size: .92rem; margin: 0; }
.msg.bad { color: var(--bad); }
.msg.good { color: var(--good); }

.explain { margin-top: 4rem; display: grid; gap: 2.5rem; }
.explain h2 { font-family: var(--font-display); font-size: var(--step-2); margin: 0 0 .9rem; font-weight: 750; font-variation-settings: "wdth" 88; letter-spacing: -.01em; text-wrap: balance; }
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.25rem; counter-reset: step; }
@media (max-width: 760px) { .steps { grid-template-columns: minmax(0, 1fr); } }
.steps div { border-top: 1.5px solid var(--ink); padding-top: .8rem; }
.steps div::before { counter-increment: step; content: "Step " counter(step); font-family: var(--font-data); font-size: .68rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); }
.steps h3 { margin: .3rem 0 .35rem; font-size: var(--step-1); }
.steps p { margin: 0; color: var(--ink-soft); max-width: 34ch; }
.faq { max-width: 44rem; }
.faq details { border-top: 1px solid var(--rule); padding-block: .85rem; }
.faq details:last-child { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; font-weight: 650; list-style: none; display: flex; justify-content: space-between; gap: 1rem; }
.faq summary::after { content: "+"; font-family: var(--font-data); color: var(--ink-soft); }
.faq details[open] summary::after { content: "\2212"; }
.faq p { margin: .55rem 0 0; color: var(--ink-soft); max-width: 65ch; }
footer { margin-top: 3.5rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); font-family: var(--font-data); font-size: .7rem; color: var(--ink-soft); display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; justify-content: space-between; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

.prose { max-width: 42rem; padding-block: 2.5rem 4rem; }
.prose h1 { font-size: var(--step-3); margin-bottom: 1rem; }
.prose h2 { font-family: var(--font-display); font-size: var(--step-1); margin: 2rem 0 .4rem; }
.prose p, .prose li { color: var(--ink-soft); }
.prose a { color: var(--ink); }