/* Blog42 / Protocol Ledger. Tokens locked in design/DESIGN.md.
   auteur-allow: CREAM_DEFAULT -- User-approved handled-paper field; COMMIT-SHEET section 2. */
:root {
  color-scheme: light;
  --paper: oklch(0.89 0.06 85);
  --paper-light: oklch(0.93 0.045 87);
  --paper-deep: oklch(0.82 0.065 78);
  --ink: oklch(0.22 0.025 65);
  --muted: oklch(0.40 0.04 65);
  --rule: oklch(0.59 0.06 70);
  --coffee: oklch(0.34 0.07 55);
  --mono: "Liberation Mono", "Courier New", monospace;
  --serif: "Liberation Serif", Georgia, serif;
  --sans: "Liberation Sans", Arial, sans-serif;
  --step--1: 0.72rem;
  --step-0: clamp(1.05rem, 1.2vw, 1.2rem);
  --step-1: clamp(1.3rem, 2vw, 1.75rem);
  --step-2: clamp(1.8rem, 3vw, 2.7rem);
  --step-hero: clamp(2.65rem, 6.2vw, 5.25rem);
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 7rem;
  --frame: 86rem;
  --measure: 72ch;
  --rule-width: 1px;
  --hard-shadow: 0.7rem 0.7rem 0 var(--paper-deep);
  --radius: 0;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --ui-duration: 140ms;
  --parallax-headline: 8px;
  --parallax-card: 16px;
}
* { box-sizing: border-box; }
html { background: var(--paper); scroll-padding-block: 1rem; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: var(--step-0)/1.55 var(--serif);
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.22em; }
a, button, summary {
  -webkit-tap-highlight-color: oklch(0.34 0.07 55 / 0.15);
  transition: color var(--ui-duration) var(--ease-out), opacity var(--ui-duration) var(--ease-out), transform var(--ui-duration) var(--ease-out);
}
:focus-visible { outline: 3px solid var(--coffee); outline-offset: 5px; }
::selection { color: var(--paper-light); background: var(--coffee); }
p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }
h1 { margin: 0; font: 700 var(--step-hero)/0.98 var(--mono); letter-spacing: -0.04em; }
h2 { margin: 0 0 1.25rem; font: 700 var(--step-2)/1.08 var(--mono); letter-spacing: -0.025em; }
h3 { margin: 1.5rem 0 0.6rem; font: 700 var(--step-1)/1.2 var(--mono); letter-spacing: -0.02em; }
.frame { width: min(calc(100% - 3rem), var(--frame)); margin-inline: auto; }
.skip-link { transition: none; position: absolute; top: 1rem; left: 1rem; z-index: 2; transform: translateY(-200%); padding: 0.75rem 1rem; background: var(--paper-light); font-family: var(--sans); }
.skip-link:focus { transform: none; }
.masthead { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; padding-block: 1.25rem; }
.brand { display: flex; align-items: center; gap: 0.85rem; text-decoration: none; }
.seal { display: grid; place-items: center; width: 3.25rem; aspect-ratio: 1; border: 3px solid var(--ink); font: 700 1.4rem/1 var(--sans); }
.publication strong { display: block; font: 700 1.15rem/1 var(--sans); letter-spacing: 0.01em; }
.publication small { display: block; margin-top: 0.45rem; color: var(--coffee); font: 700 0.64rem/1.2 var(--sans); letter-spacing: 0.13em; text-transform: uppercase; }
nav { display: flex; gap: 1.5rem; align-items: center; flex-wrap: wrap; }
nav a { padding-block: 0.65rem; font: 700 0.8rem/1.2 var(--sans); text-decoration: none; border-bottom: 1px solid transparent; }
nav a[aria-current="page"] { border-bottom: 2px solid var(--coffee); }
.control-band { border-block: 1px solid var(--ink); background: var(--paper-deep); }
.control-inner { display: flex; justify-content: space-between; gap: 1rem; align-items: stretch; font: 700 0.65rem/1.4 var(--sans); letter-spacing: 0.11em; text-transform: uppercase; }
.control-inner span { padding-block: 0.75rem; }
.control-inner .edition { padding-inline: 0.85rem; background: var(--coffee); color: var(--paper-light); }
.meta { color: var(--muted); font: 0.75rem/1.55 var(--mono); font-variant-numeric: tabular-nums; }
.label { color: var(--coffee); font: 700 0.7rem/1.3 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; }
.protocol-layout { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(20rem, 0.78fr); gap: clamp(2rem, 5vw, 6rem); padding-top: clamp(3rem, 6vw, 6rem); }
.protocol-copy { padding-bottom: 4.5rem; }
.protocol-copy h1 { max-width: 12ch; margin: 0; }
.title-frame { position: relative; margin-top: 1.5rem; padding: clamp(1.25rem, 2.5vw, 2rem); border: 3px solid var(--ink); background: oklch(0.93 0.045 87 / 0.35); }
.stamp { position: absolute; top: -1.5rem; right: 1.25rem; padding: 0.55rem 0.7rem; border: 2px solid var(--coffee); color: var(--coffee); background: var(--paper); font: 700 0.64rem/1.3 var(--mono); letter-spacing: 0.08em; transform: rotate(2.5deg); }
.protocol-layout .ledger-row { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 1rem; padding: 1.05rem 1rem; }
.protocol-layout .ledger-row dd strong { font-size: 1rem; }
.protocol-layout .ledger-row dd small { font: 0.94rem/1.4 var(--serif); }
.protocol-layout .ledger-row dd { font-size: 0.94rem; line-height: 1.35; }
.protocol-layout .ledger-title { background: var(--ink); color: var(--paper-light); padding: 0.85rem 1rem; font-size: 0.7rem; }
.title-date { display: block; margin-top: 0.15em; color: var(--coffee); }
.dek { max-width: 51ch; margin: 1.75rem 0 0; font-size: clamp(1.1rem, 1.5vw, 1.35rem); line-height: 1.5; }
.preview-note { margin: 1.25rem 0 0; color: var(--muted); font: 0.75rem/1.6 var(--mono); }
.actions { display: flex; gap: 1rem 1.75rem; align-items: center; flex-wrap: wrap; margin-top: 2rem; }
.action-primary, .action-text { display: inline-flex; align-items: center; justify-content: center; min-height: 2.85rem; font: 700 0.8rem/1.3 var(--sans); }
.action-primary { padding: 0.8rem 1.1rem; border: 1px solid var(--coffee); color: var(--paper-light); background: var(--coffee); text-decoration: none; }
.action-text { text-decoration-thickness: 1px; }
.action-primary:active, .action-text:active { transform: translateY(1px); }
.cutout { border: 2px dashed var(--coffee); background: var(--paper-light); box-shadow: var(--hard-shadow); }
.ledger { align-self: end; margin-bottom: -3.5rem; position: relative; z-index: 1; }
.ledger-title { display: flex; justify-content: space-between; gap: 1rem; margin: 0; padding: 1rem 1.25rem; border-bottom: 1px solid var(--coffee); font: 700 0.8rem/1.3 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; }
.ledger-title span { font: 0.7rem/1.5 var(--mono); letter-spacing: 0; }
.ledger dl { margin: 0; }
.ledger-row { padding: 1.25rem; border-bottom: 1px solid var(--rule); }
.ledger-row dt { margin-bottom: 0.5rem; color: var(--coffee); font: 700 0.68rem/1.3 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; }
.ledger-row dd { margin: 0; font-size: 1.1rem; }
.ledger-row dd strong { display: block; font: 700 1.15rem/1.25 var(--mono); }
.ledger-row dd small { display: block; margin-top: 0.55rem; color: var(--muted); font: 0.82rem/1.45 var(--sans); }
.ledger-note { margin: 0; padding: 1rem 1.25rem; color: var(--muted); background: var(--paper-deep); font: 0.7rem/1.55 var(--mono); }
.issue-rail { min-height: 8rem; padding-block: 2.3rem; background: var(--ink); color: var(--paper-light); }
.issue-rail p { max-width: 50ch; margin: 0; color: inherit; font: 0.75rem/1.6 var(--mono); }
.sources { font-size: 0.95rem; }
.sources p { padding-bottom: 1rem; border-bottom: 1px solid var(--rule); }
.sources a { overflow-wrap: anywhere; }
.reading-section h3 { margin-top: 2rem; }
.subscribe { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: center; margin-block: 7rem 5rem; padding: clamp(1.5rem, 3vw, 2.75rem); }
.subscribe h2 { margin-bottom: 0.6rem; font-size: var(--step-1); }
.subscribe p { max-width: 52ch; margin: 0; }
.subscribe-controls { display: flex; flex-wrap: wrap; gap: 0.75rem; }
button:disabled { opacity: 1; cursor: not-allowed; border: 1px solid var(--coffee); border-radius: 0; padding: 0.9rem 1rem; color: var(--coffee); background: var(--paper-deep); font: 700 0.8rem/1.35 var(--sans); }
button:disabled small { display: block; margin-top: 0.3rem; font: 0.68rem/1.2 var(--mono); }
.footer { display: grid; grid-template-columns: 1fr auto; gap: 2rem; border-top: 2px solid var(--ink); padding-block: 1.75rem 2.25rem; }
.footer p { max-width: 85ch; margin: 0.4rem 0; color: var(--muted); font: 0.72rem/1.6 var(--sans); }
.footer .footer-mark { color: var(--ink); font: 700 0.8rem/1.4 var(--mono); }
.footer nav { align-self: start; }
.page-heading { padding-block: clamp(3rem, 6vw, 5rem) 2rem; }
.page-heading h1 { max-width: 16ch; }
.page-heading .meta { margin: 1.5rem 0 0; }
.reading { max-width: var(--measure); margin-inline: auto; }
.reading > p { margin-block: 0 1.3rem; }
.reading-section { margin-block: 3rem; }
.article-heading { padding-bottom: 2rem; }
.article-heading h1 { font-size: clamp(2.4rem, 5vw, 4.4rem); max-width: 17ch; line-height: 1.05; }
.preview-banner { padding: 1rem 1.25rem; border-block: 1px solid var(--coffee); margin-bottom: 2.5rem; background: var(--paper-deep); }
.preview-banner p { margin: 0; font: 0.85rem/1.55 var(--sans); }
.article-ledger { margin-block: 2rem 3rem; }
.article-ledger .ledger { margin: 0; }
.article-ledger .ledger-row { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; }
.article-ledger .ledger-row dt { margin: 0; }
.placeholder { color: var(--muted); }
.placeholder strong { color: var(--ink); }
.claim-section { margin-block: 3rem; }
.claim-intro { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.claim-intro p { margin: 0 0 1rem; font: 0.75rem/1.5 var(--mono); color: var(--muted); }
.table-wrap { overflow-x: auto; border-block: 2px solid var(--coffee); }
table { width: 100%; min-width: 67rem; border-collapse: collapse; text-align: left; font: 0.9rem/1.5 var(--sans); }
caption { text-align: left; padding: 1rem; color: var(--muted); background: var(--paper-deep); font: 0.75rem/1.5 var(--mono); }
th, td { padding: 1.2rem 1rem; vertical-align: top; border-bottom: 1px solid var(--rule); }
thead th { color: var(--coffee); background: var(--paper-light); font-size: 0.75rem; }
tbody th { width: 15%; font-weight: 700; }
tbody td { color: var(--muted); }
tbody tr:last-child > * { border-bottom: 0; }
.table-help { margin-block: 0.75rem; color: var(--muted); font: 0.75rem/1.5 var(--sans); }
.artifact { margin-block: 2rem; }
.artifact summary { padding: 1.2rem; cursor: pointer; font: 700 1rem/1.4 var(--mono); }
.artifact summary::marker { color: var(--coffee); }
.artifact-label { display: block; margin: 0.6rem 0 0 1.3rem; color: var(--coffee); font: 700 0.65rem/1.3 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; }
.artifact-body { padding: 0 1.25rem 1.25rem; }
.artifact-body p { margin: 0; }
.artifact[open] summary { border-bottom: 1px solid var(--rule); margin-bottom: 1.25rem; }
.source-placeholder { border-block: 1px solid var(--rule); padding-block: 1.5rem; }
.source-placeholder p { margin: 0; }
.article-end { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; padding-block: 2rem 3rem; border-top: 1px solid var(--rule); font-family: var(--sans); font-size: 0.9rem; }
.archive-intro { max-width: 60ch; margin-bottom: 2.5rem; }
.archive-list { list-style: none; padding: 0; margin: 0 0 5rem; }
.archive-entry { display: grid; grid-template-columns: 12rem 1fr auto; gap: 2rem; padding-block: 2rem; border-block: 1px solid var(--coffee); }
.archive-entry h2 { font-size: var(--step-1); max-width: 33ch; }
.archive-entry p { max-width: 60ch; margin: 0.75rem 0 0; }
.archive-entry > a { align-self: start; }
.status-tag { display: inline-block; padding: 0.25rem 0.5rem; border: 1px solid var(--coffee); font: 700 0.7rem/1.4 var(--sans); }
.method-list { margin: 0; }
.method-list > div { display: grid; grid-template-columns: 11rem 1fr; gap: 1.5rem; padding-block: 1rem; border-top: 1px solid var(--rule); }
.method-list dt { font: 700 0.9rem/1.5 var(--sans); }
.method-list dd { margin: 0; }
.about-end { margin-bottom: 4rem; }
@media (hover: hover) and (pointer: fine) {
  a:hover { color: var(--coffee); }
  nav a:hover { border-bottom-color: var(--coffee); }
  .action-primary:hover { color: var(--paper-light); opacity: 0.9; transform: translateY(-2px); }
  .action-text:hover { transform: translateY(-2px); }
  summary:hover { color: var(--coffee); }
}
/* Hierarchy only: two bounded transform families; static in unsupported browsers. */
@supports (animation-timeline: scroll()) {
  @media (prefers-reduced-motion: no-preference) {
    .headline-drift { animation: headline-drift 1s var(--ease-out) both; animation-timeline: scroll(root block); }
    .card-drift { animation: card-drift 1s var(--ease-out) both; animation-timeline: scroll(root block); }
  }
}
@keyframes headline-drift { from { transform: translateY(0); } to { transform: translateY(-8px); } }
@keyframes card-drift { from { transform: translateY(0); } to { transform: translateY(-16px); } }
@media (prefers-reduced-motion: reduce) {
  .headline-drift, .card-drift { animation: none; transform: none; }
  .action-primary, .action-text { transform: none !important; }
}
@media (max-width: 65rem) {
  .subscribe { grid-template-columns: 1fr; }
  .archive-entry { grid-template-columns: 9rem 1fr; }
  .archive-entry > a { grid-column: 2; }
}
@media (max-width: 50rem) {
  .frame { width: calc(100% - 2rem); }
  .masthead { flex-wrap: wrap; gap: 1rem; }
  .masthead nav { gap: 1.5rem; }
  .protocol-layout { grid-template-columns: 1fr; padding-top: 3rem; gap: 2.5rem; }
  .protocol-copy { padding-bottom: 0; }
  .protocol-copy h1 { max-width: 16ch; }
  .ledger { margin: 0 0 2rem; }
  .issue-rail p { max-width: none; }
  .subscribe { margin-block: 3rem; }
  .footer { grid-template-columns: 1fr; gap: 1rem; }
  .control-inner .control-subject { display: none; }
}
@media (max-width: 30rem) {
  .masthead nav { width: 100%; justify-content: space-between; gap: 0.5rem; }
  .protocol-copy h1 { font-size: clamp(2rem, 9.4vw, 2.8rem); }
  .title-frame { padding: 1rem; }
  .stamp { position: static; display: inline-block; margin-bottom: 1rem; }
  .protocol-layout .ledger-row { grid-template-columns: 1fr; gap: 0.35rem; }
  .publication small { font-size: 0.6rem; }
  .article-ledger .ledger-row, .method-list > div { grid-template-columns: 1fr; gap: 0.6rem; }
  .archive-entry { grid-template-columns: 1fr; gap: 1.25rem; }
  .archive-entry > a { grid-column: auto; justify-self: start; }
  .subscribe-controls { flex-direction: column; align-items: stretch; }
  .subscribe-controls button { text-align: left; }
  .actions { gap: 0.75rem 1.25rem; }
}
@media print {
  @page { margin: 16mm; }
  body { font-size: 11pt; }
  .masthead, .control-band, .skip-link, .subscribe, nav, .actions, .article-end, .table-help { display: none !important; }
  .frame, .reading { width: 100%; max-width: none; }
  .headline-drift, .card-drift { animation: none !important; transform: none !important; }
  .cutout { box-shadow: none; }
  .page-heading { padding-top: 0; }
  h1, .article-heading h1 { font-size: 26pt; max-width: none; }
  h2 { font-size: 19pt; break-after: avoid; }
  h3, summary { break-after: avoid; }
  .ledger, .ledger-row, tr, .artifact { break-inside: avoid; }
  details::details-content { content-visibility: visible !important; display: block !important; height: auto !important; }
  details > .artifact-body { display: block !important; }
  .artifact summary { border-bottom: 1px solid var(--rule); margin-bottom: 1rem; }
  .table-wrap { overflow: visible; }
  table { min-width: 0; table-layout: fixed; font-size: 8pt; }
  th, td { padding: 0.5rem 0.35rem; overflow-wrap: anywhere; }
  a[href^="https://"]::after { content: " (" attr(href) ")"; font-size: 0.8em; overflow-wrap: anywhere; }
  .sources a[href^="https://"]::after { content: none; }
  .footer { display: block; margin-top: 2rem; }
  .footer p { color: var(--ink); }
  .reading-section, .claim-section { margin-block: 1.5rem; }
}