@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&family=Instrument+Serif:ital@0;1&display=swap');

:root {
  --ink: #171914;
  --ink-soft: #4f5349;
  --paper: #f4f1e8;
  --paper-deep: #e9e3d5;
  --white: #fffdf7;
  --blue: #3157ff;
  --blue-dark: #1734bd;
  --lime: #d9ff57;
  --red: #a63124;
  --amber: #8a5a00;
  --green: #1e6547;
  --line: rgba(23, 25, 20, .24);
  --line-strong: rgba(23, 25, 20, .58);
  --serif: "Instrument Serif", Georgia, serif;
  --sans: "DM Sans", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --space-1: .5rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 7rem;
  --fast: 140ms cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 400 1rem/1.55 var(--sans);
}
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; }
h1, h2, h3, h4, p { text-wrap: pretty; }

.skip-link {
  position: fixed;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 100;
  padding: var(--space-2) var(--space-3);
  color: white;
  background: var(--ink);
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

.site-header, main, footer {
  width: min(1320px, calc(100% - 48px));
  margin-inline: auto;
}
.site-header {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  text-decoration: none;
}

.brand-logo {
  display: block;
  width: clamp(148px, 14vw, 190px);
  height: auto;
}
.brand--footer .brand-logo { width: 154px; }
.brand-mark {
  display: block;
  width: 30px;
  height: 30px;
  overflow: hidden;
  color: transparent;
  background: url('/favicon.svg') center / contain no-repeat;
}
.header-label { font: 500 .75rem/1 var(--mono); text-transform: uppercase; letter-spacing: .08em; }

.eyebrow {
  margin: 0 0 var(--space-4);
  font: 600 .72rem/1.2 var(--sans);
  text-transform: uppercase;
  letter-spacing: .14em;
}
.hero {
  min-height: calc(100vh - 86px);
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  align-items: center;
  gap: clamp(3rem, 9vw, 9rem);
  padding: var(--space-7) 0 var(--space-8);
}
h1 {
  max-width: 950px;
  margin: 0;
  font: 400 clamp(4rem, 7.8vw, 8.25rem)/.86 var(--serif);
  letter-spacing: -.045em;
}
.hero-line {
  margin: var(--space-5) 0 0;
  color: var(--blue);
  font: 400 clamp(1.7rem, 3vw, 3rem)/1.05 var(--serif);
}
.hero-intro { max-width: 680px; margin: var(--space-4) 0; font-size: clamp(1.05rem, 1.4vw, 1.25rem); }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-4); }
.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  padding: .85rem 1rem;
  border: 1px solid var(--ink);
  border-radius: 0;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--fast), background-color var(--fast), color var(--fast);
}
.button:hover { transform: translateY(-2px); }
.button--primary { color: white; background: var(--ink); }
.button--primary:hover { background: var(--blue-dark); }
.button--secondary { background: transparent; }
.button--secondary:hover { color: white; background: var(--ink); }
.button--lime { background: var(--lime); }
.button--lime:hover { color: white; background: var(--blue-dark); }
.text-link { min-height: 44px; display: inline-flex; align-items: center; gap: 1rem; border-bottom: 1px solid var(--line-strong); text-decoration: none; font-weight: 600; }
.file-note { margin: var(--space-3) 0 0; color: var(--ink-soft); font: 400 .73rem/1.4 var(--mono); }

.test-sheet {
  transform: rotate(1.4deg);
  color: white;
  background: var(--ink);
  box-shadow: 16px 18px 0 rgba(23,25,20,.1);
}
.test-sheet > p { margin: 0; padding: var(--space-4); color: var(--lime); font: 400 1.45rem/1.1 var(--serif); border-bottom: 1px solid rgba(255,255,255,.2); }
.test-sheet ol { margin: 0; padding: 0; list-style: none; }
.test-sheet li { display: grid; grid-template-columns: 42px 1fr; gap: 1rem; padding: .8rem var(--space-4); border-bottom: 1px solid rgba(255,255,255,.13); font-size: .9rem; }
.test-sheet li:last-child { border-bottom: 0; }
.test-sheet li span { color: rgba(255,255,255,.55); font: 400 .75rem/1.6 var(--mono); }

.how {
  margin-inline: calc(50% - 50vw);
  padding: var(--space-8) max(24px, calc((100vw - 1320px) / 2));
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: clamp(3rem, 9vw, 8rem);
  color: white;
  background: var(--ink);
}
h2 { margin: 0; font: 400 clamp(3rem, 5.5vw, 6rem)/.9 var(--serif); letter-spacing: -.035em; }
.steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.35); }
.steps li { display: grid; grid-template-columns: 34px 1fr; gap: 1.2rem; padding: var(--space-4) 0; border-bottom: 1px solid rgba(255,255,255,.2); }
.steps span { color: var(--lime); font-family: var(--mono); }
.steps p { margin: 0; color: rgba(255,255,255,.73); }
.steps strong { color: white; }
.principle { grid-column: 2; margin: calc(-1 * var(--space-4)) 0 0; padding: var(--space-4); color: var(--ink); background: var(--lime); }

.workspace { padding: var(--space-8) 0; }
.workspace-head { display: grid; grid-template-columns: 1fr minmax(240px, .45fr); align-items: end; gap: var(--space-7); margin-bottom: var(--space-7); }
.progress-block { padding-bottom: .6rem; }
.progress-block p { margin: 0 0 var(--space-2); font: 500 .8rem/1.2 var(--mono); }
.progress-track { height: 8px; overflow: hidden; background: var(--paper-deep); border: 1px solid var(--line); }
.progress-track span { display: block; width: 0; height: 100%; background: var(--blue); transition: width 220ms cubic-bezier(.2,.7,.2,1); }

.test-row { border-top: 1px solid var(--ink); }
.test-row:last-child { border-bottom: 1px solid var(--ink); }
.test-row-head {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) auto;
  gap: var(--space-4);
  padding: var(--space-5) 0 var(--space-4);
  align-items: start;
}
.test-number { font: 400 1rem/1.3 var(--mono); color: var(--blue); }
.test-verb { margin: 0 0 .2rem; color: var(--ink-soft); font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; }
.test-row h3 { margin: 0; font: 400 clamp(2.4rem, 4.5vw, 4.5rem)/.9 var(--serif); }
.test-row-head p:last-child { max-width: 680px; margin: var(--space-2) 0 0; color: var(--ink-soft); }
.test-state { min-width: 120px; padding: .5rem .7rem; border: 1px solid var(--line); font: 500 .72rem/1 var(--mono); text-align: center; }
.test-state[data-result="pass"] { color: var(--green); border-color: var(--green); }
.test-state[data-result="mixed"] { color: var(--amber); border-color: var(--amber); }
.test-state[data-result="fail"] { color: var(--red); border-color: var(--red); }
.test-state[data-result="not-supported"] { color: var(--ink-soft); border-style: dashed; }
.test-body { margin: 0 0 var(--space-7) 94px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(270px, .5fr); gap: var(--space-4) var(--space-6); }
.prompt-block { grid-column: 1; background: var(--white); border-left: 5px solid var(--blue); }
.block-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); padding: .8rem 1rem; border-bottom: 1px solid var(--line); }
.block-head h4 { margin: 0; font: 500 .72rem/1.2 var(--mono); text-transform: uppercase; letter-spacing: .07em; }
.copy-button { min-height: 36px; padding: .35rem .65rem; color: var(--blue-dark); background: transparent; border: 1px solid var(--blue); cursor: pointer; font-size: .78rem; font-weight: 600; }
.copy-button:hover { color: white; background: var(--blue-dark); }
.prompt-block pre { margin: 0; padding: var(--space-4); font: 400 .86rem/1.65 var(--mono); }
.expected-block { grid-column: 1; border-bottom: 1px solid var(--line); }
.expected-block summary { min-height: 44px; display: flex; align-items: center; cursor: pointer; font-weight: 600; }
.expected-block p { margin: 0 0 var(--space-4); color: var(--ink-soft); }
.test-body blockquote { grid-column: 2; grid-row: 1 / span 2; margin: 0; padding: var(--space-5); align-self: stretch; color: white; background: var(--blue-dark); font: 400 1.55rem/1.12 var(--serif); }
.result-fieldset { grid-column: 1 / -1; margin: 0; padding: 0; border: 0; }
.result-fieldset legend, .verify-fieldset legend, .scope-fieldset legend { margin-bottom: var(--space-2); font-weight: 600; }
.status-options { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line-strong); }
.status-option { min-height: 52px; display: flex; align-items: center; justify-content: center; gap: .55rem; cursor: pointer; border-right: 1px solid var(--line); font-size: .86rem; }
.status-option:last-child { border-right: 0; }
.status-option input { position: absolute; opacity: 0; pointer-events: none; }
.status-option:has(input:focus-visible) { outline: 3px solid var(--blue); outline-offset: 3px; z-index: 1; }
.status-option:has(input:checked) { color: white; background: var(--ink); }
.status-option--pass:has(input:checked) { background: var(--green); }
.status-option--mixed:has(input:checked) { color: var(--ink); background: #f5c95c; }
.status-option--fail:has(input:checked) { background: var(--red); }
.status-option span { font: 500 1.15rem/1 var(--mono); }
.verify-fieldset { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-5); margin: 0; padding: var(--space-3); border: 1px dashed var(--line-strong); }
.verify-fieldset legend { padding-inline: .4rem; }
.verify-fieldset label { min-height: 30px; display: flex; align-items: center; gap: .5rem; }
.scope-fieldset { grid-column: 1 / -1; margin: 0; padding: var(--space-3); border: 1px dashed var(--line-strong); }
.scope-fieldset > div { display: grid; grid-template-columns: minmax(220px, 1fr) auto auto; align-items: center; gap: var(--space-3); padding: .55rem 0; }
.scope-fieldset > div + div { border-top: 1px solid var(--line); }
.scope-fieldset label { min-height: 32px; display: flex; align-items: center; gap: .4rem; }
.comment-label { grid-column: 1 / -1; font-weight: 600; }
textarea, input[type="text"] { width: 100%; display: block; margin-top: var(--space-2); padding: .85rem 1rem; color: var(--ink); background: var(--white); border: 1px solid var(--line-strong); border-radius: 0; }
textarea { resize: vertical; min-height: 92px; line-height: 1.5; }
::placeholder { color: var(--ink-soft); opacity: 1; }

.identity-section { margin: var(--space-8) 0 0; padding: var(--space-7) 0; display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-7); border-block: 1px solid var(--ink); }
.identity-fields { display: grid; align-content: center; gap: var(--space-4); }
.identity-fields label { font-weight: 600; }

.report-section { margin-inline: calc(50% - 50vw); padding: var(--space-8) max(24px, calc((100vw - 1320px) / 2)); display: grid; grid-template-columns: .72fr 1.28fr; gap: clamp(3rem, 8vw, 8rem); color: white; background: var(--ink); }
.report-intro > p:not(.eyebrow) { max-width: 520px; color: rgba(255,255,255,.72); }
.report-intro label { display: block; margin-top: var(--space-5); font-weight: 600; }
.report-intro textarea { color: var(--ink); }
.report-paper { position: relative; padding: var(--space-5); color: var(--ink); background: var(--white); box-shadow: 14px 16px 0 rgba(217,255,87,.85); }
.report-paper-head { display: flex; justify-content: space-between; gap: var(--space-3); padding-bottom: var(--space-3); border-bottom: 2px solid var(--ink); font: 500 .72rem/1.3 var(--mono); text-transform: uppercase; letter-spacing: .05em; }
.report-agent { margin: var(--space-4) 0; font: 400 1.5rem/1.15 var(--serif); }
.report-paper ol { margin: 0; padding: 0; list-style: none; }
.report-paper li { display: grid; grid-template-columns: 1fr auto; gap: .35rem var(--space-3); padding: .75rem 0; border-bottom: 1px solid var(--line); }
.report-paper li strong { font: 500 .76rem/1.5 var(--mono); }
.report-paper li small { grid-column: 1 / -1; color: var(--ink-soft); }
.report-empty { margin: var(--space-4) 0 0; color: var(--ink-soft); font-size: .85rem; }

.export-section { padding: var(--space-8) 0 0; display: grid; grid-template-columns: .8fr 1.2fr; gap: var(--space-7); }
.export-section > div:first-child p:last-child { max-width: 500px; color: var(--ink-soft); }
.export-actions { display: flex; flex-direction: column; align-items: stretch; gap: var(--space-3); }
.artifact-prompt { grid-column: 1 / -1; margin-top: var(--space-4); border-top: 1px solid var(--ink); }
.artifact-prompt summary { min-height: 64px; display: flex; align-items: center; cursor: pointer; font-weight: 600; }
.artifact-prompt pre { max-height: 520px; overflow: auto; margin: 0; padding: var(--space-4); background: var(--white); border-left: 5px solid var(--blue); font: 400 .78rem/1.6 var(--mono); }
.rerun-note { grid-column: 1 / -1; margin: 0; padding: var(--space-4); border-left: 5px solid var(--lime); background: var(--white); }

footer { min-height: 120px; margin-top: var(--space-8); display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); border-top: 1px solid var(--ink); font-size: .78rem; }
footer p { margin: 0; }
.toast { position: fixed; right: var(--space-4); bottom: var(--space-4); z-index: 50; max-width: min(380px, calc(100vw - 48px)); padding: .85rem 1rem; color: white; background: var(--blue-dark); transform: translateY(calc(100% + 40px)); transition: transform 180ms cubic-bezier(.2,.7,.2,1); }
.toast.is-visible { transform: translateY(0); }
noscript { display: block; padding: var(--space-4); color: white; background: var(--red); }

@media (max-width: 900px) {
  .site-header, main, footer { width: min(100% - 32px, 1320px); }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  h1 { font-size: clamp(4rem, 13vw, 7rem); }
  .test-sheet { width: min(620px, 95%); margin-inline: auto; }
  .how, .report-section { grid-template-columns: 1fr; }
  .principle { grid-column: 1; margin-top: 0; }
  .workspace-head { grid-template-columns: 1fr; gap: var(--space-5); }
  .test-body { margin-left: 0; }
  .identity-section, .export-section { grid-template-columns: 1fr; gap: var(--space-5); }
  .artifact-prompt { grid-column: 1; }
}

@media (max-width: 620px) {
  :root { --space-8: 5rem; --space-7: 3.5rem; }
  .site-header { min-height: 72px; }
  .header-label { display: none; }
  .hero { padding-top: var(--space-6); }
  h1 { font-size: clamp(3.45rem, 16vw, 5.2rem); }
  h2 { font-size: clamp(2.8rem, 13vw, 4.3rem); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-actions .text-link { align-self: flex-start; }
  .test-sheet { width: calc(100% - 10px); box-shadow: 9px 10px 0 rgba(23,25,20,.1); }
  .test-row-head { grid-template-columns: 42px 1fr; gap: var(--space-3); }
  .test-state { grid-column: 2; justify-self: start; }
  .test-body { display: block; }
  .test-body > * { margin-bottom: var(--space-4); }
  .test-body blockquote { min-height: 150px; }
  .status-options { grid-template-columns: 1fr 1fr; }
  .status-option { border-bottom: 1px solid var(--line); }
  .status-option:nth-child(2) { border-right: 0; }
  .status-option:nth-child(n+3) { border-bottom: 0; }
  .report-paper { padding: var(--space-4); box-shadow: 8px 9px 0 rgba(217,255,87,.85); }
  .report-paper-head { align-items: flex-start; flex-direction: column; }
  .scope-fieldset > div { grid-template-columns: 1fr auto auto; }
  footer { padding: var(--space-5) 0; flex-wrap: wrap; }
  footer p:last-child { width: 100%; }
}

@media (forced-colors: active) {
  .progress-track span, .button, .status-option:has(input:checked), .test-body blockquote { forced-color-adjust: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button, .progress-track span, .toast { transition-duration: .01ms; }
}