/* ------------------------------------------------------------------
   Tokens. Paper and ink. One vermilion accent, reserved for state
   (edited, broken) and keyboard focus. Every text token clears WCAG AA
   at the size it is used.
------------------------------------------------------------------- */
:root {
  --paper: #f3efe6;
  --paper-2: #ebe5d8;
  --ink: #14130f;
  --ink-2: #48443b;       /* 8.4:1 on paper */
  --ink-3: #685f52;       /* 5.5:1 on paper, 5.0:1 on paper-2 */
  --rule: #d6cebd;
  --rule-strong: #14130f;
  --accent: #c9401c;      /* borders, focus */
  --accent-text: #a93511; /* text in the accent: 5.7:1 on paper */

  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Mono: label 12 / meta 13 / h2 15. Serif: body 19 / h4 21 / h3 / lede / name. */
  --t-label: 12px;
  --t-meta: 13px;
  --t-h2: 15px;
  --t-body: 19px;
  --t-h4: 21px;
  --t-lede: clamp(21px, 1.4vw + 12px, 26px);
  --t-h3: clamp(24px, 1vw + 18px, 30px);
  --t-name: clamp(76px, 15vw, 212px);

  --gutter: clamp(16px, 2.2vw, 32px);
  --section: clamp(48px, 7vw, 96px);
  --max: 1280px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #13120e; --paper-2: #1c1a15; --ink: #ece6d6; --ink-2: #bdb5a3; --ink-3: #9c9584;
    --rule: #2f2c24; --rule-strong: #ece6d6; --accent: #ff6b3d; --accent-text: #ff6b3d; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #13120e; --paper-2: #1c1a15; --ink: #ece6d6; --ink-2: #bdb5a3; --ink-3: #9c9584;
  --rule: #2f2c24; --rule-strong: #ece6d6; --accent: #ff6b3d; --accent-text: #ff6b3d; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 var(--t-body)/1.55 var(--serif);
  font-optical-sizing: auto; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: var(--ink); color: var(--paper); }
h1, h2, h3, p, ol, ul, dd { margin: 0; }
ol, ul { padding: 0; list-style: none; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; font: 500 var(--t-label)/1 var(--mono); z-index: 10; }
.skip:focus { left: 8px; }

/* The mono voice: labels, data, interface */
.kicker, .lbl, .meta, .tags, nav, .chain-state, .textbtn, .handle, .colophon {
  font-family: var(--mono); letter-spacing: 0.02em;
}

/* 12-column frame. Columns 1–2 are the margin rail: block numbers and section labels hang there. */
.top, .hero, .ledger, .practice, .elsewhere, .colophon {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  max-width: var(--max); margin: 0 auto; padding-inline: var(--gutter);
}

/* ---------------- Header ---------------- */
.top { align-items: center; padding-block: 20px; border-bottom: 1px solid var(--rule); }
.mark { grid-column: 1 / 3; position: relative; width: 26px; height: 26px; display: block; }
.mark-a, .mark-b { position: absolute; width: 11px; height: 11px; background: var(--ink); }
.mark-a { left: 0; top: 0; }
.mark-b { right: 0; bottom: 0; }
.mark::after { content: ""; position: absolute; left: 11px; top: 5px; width: 9px; height: 10px; border-top: 1px solid var(--ink); border-right: 1px solid var(--ink); }
nav { grid-column: 3 / 13; display: flex; gap: 28px; font-size: var(--t-meta); }
nav a { text-decoration: none; color: var(--ink-2); }
nav a:hover { color: var(--ink); }

/* ---------------- Hero ---------------- */
.hero { padding-block: clamp(56px, 9vw, 120px) 0; }
.kicker { grid-column: 3 / 13; font-size: var(--t-meta); color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.08em; }
.hero h1 {
  grid-column: 1 / 13; font-weight: 400; font-size: var(--t-name); line-height: 0.86; letter-spacing: -0.045em;
  margin: 18px 0 clamp(36px, 5vw, 64px) -0.05em; font-variation-settings: "opsz" 72;
}
.hero h1 span { display: block; }
/* The surname steps in to the content column, so it lines up with the kicker and the lede. */
.hero h1 span + span { padding-left: 1.05em; }
@media (min-width: 901px) {
  .hero h1 span + span { padding-left: calc((100% - 0.05em + var(--gutter)) / 6 + 0.05em); }
}
.lede { grid-column: 3 / 13; font-size: var(--t-lede); line-height: 1.38; letter-spacing: -0.005em; max-width: 34ch; text-wrap: pretty; }

/* ---------------- Section heads: labels hang in the rail ---------------- */
h2 { font: 500 var(--t-h2)/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }
.sec-head { grid-column: 1 / 13; display: grid; grid-template-columns: subgrid; align-items: baseline; padding-bottom: 20px; border-bottom: 1px solid var(--rule-strong); }
.sec-head h2 { grid-column: 1 / 3; }
.sec-note { grid-column: 3 / 9; max-width: 54ch; font-size: 15px; color: var(--ink-2); line-height: 1.5; text-wrap: pretty; }

/* ---------------- Ledger (the chain) ---------------- */
.ledger { padding-block: var(--section) clamp(40px, 6vw, 72px); }
.ledger + .ledger { padding-top: clamp(24px, 4vw, 48px); }
.chain { grid-column: 1 / 13; }
.block {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter);
  padding: 28px 0 30px; border-bottom: 1px solid var(--rule); position: relative;
}
/* the link between blocks: a short rule in the rail, on the block number's left edge */
.block::before {
  content: ""; position: absolute; left: 0; top: -1px; height: 20px; width: 0; border-left: 1px solid var(--rule-strong);
}
.block:first-child::before { display: none; }
.meta { grid-column: 1 / 3; display: flex; flex-direction: column; gap: 6px; padding-top: 4px; }
.height { font-size: 22px; font-weight: 500; line-height: 1; font-variant-numeric: tabular-nums; }
.date { font-size: var(--t-label); color: var(--ink-2); font-variant-numeric: tabular-nums; }
.content { grid-column: 3 / 9; }
.content h3 { font-weight: 400; font-size: var(--t-h3); line-height: 1.15; letter-spacing: -0.015em; margin-bottom: 8px; }
.content h3 a { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.14em; text-decoration-color: var(--ink-3); }
.content h3 a:hover { text-decoration-color: var(--ink); }
.body { color: var(--ink-2); max-width: 54ch; border-radius: 2px; margin-inline: -6px; padding-inline: 6px; text-wrap: pretty; cursor: text; transition: background-color .15s ease, box-shadow .15s ease; }
.body:hover { background: var(--paper-2); }
.body:focus { outline: none; background: var(--paper-2); box-shadow: inset 2px 0 0 var(--accent); color: var(--ink); }
.tags { margin-top: 12px; font-size: var(--t-label); color: var(--ink-3); letter-spacing: 0.04em; }

.proof { grid-column: 9 / 13; display: grid; grid-template-columns: auto 1fr; column-gap: 12px; row-gap: 2px; align-content: start; padding-top: 8px; font-family: var(--mono); font-size: var(--t-label); }
.proof .lbl { color: var(--ink-3); font-size: var(--t-label); line-height: 1.7; }
.proof code { font-family: var(--mono); color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.7; }
.verdict { grid-column: 1 / 3; margin-top: 8px; font-size: var(--t-label); color: var(--ink-3); }
.verdict:empty { display: none; }

/* State. edited: this block changed. linkfail: its prev no longer matches. broken: on or after a failed link. */
.block.edited .hash, .block.edited .verdict { color: var(--accent-text); }
.block.linkfail .prev { color: var(--accent-text); text-decoration: line-through; text-decoration-thickness: 1px; }
.block.broken:not(.linkfail) .body { color: var(--ink-3); }
.block.broken .verdict, .block.broken .height { color: var(--accent-text); }
.block.broken::before, .block.broken + .block::before { border-left: 1px dashed var(--accent); }

.chain-foot { grid-column: 3 / 13; display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 24px; padding-top: 18px; }
.chain-state { font-size: var(--t-meta); color: var(--ink-2); }
.chain-state:focus { outline: none; }
.chain-state.bad { color: var(--accent-text); }
.textbtn { background: none; border: 0; padding: 0; font-size: var(--t-meta); color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; cursor: pointer; }
.textbtn:hover { text-decoration-thickness: 2px; }

/* ---------------- Elsewhere ---------------- */
.elsewhere h2 { grid-column: 1 / 3; padding-top: 15px; }
.elsewhere { padding-block: var(--section) clamp(56px, 8vw, 112px); }
.links { grid-column: 3 / 13; border-top: 1px solid var(--rule-strong); }
.links a {
  display: grid; grid-template-columns: 9em minmax(0, 1fr); align-items: baseline; gap: 16px;
  padding: 12px 0 11px; border-bottom: 1px solid var(--rule); text-decoration: none;
}
.where { font-size: var(--t-h4); line-height: 1.3; letter-spacing: -0.01em; }
.handle { font-size: var(--t-meta); color: var(--ink-3); }
.links a:hover .where { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }

/* ---------------- Footer ---------------- */
.colophon { padding-block: 22px 40px; font-size: var(--t-label); color: var(--ink-3); row-gap: 6px; line-height: 1.6; }
.colophon p { grid-column: 3 / 13; text-wrap: balance; }
.colophon .tip:empty { display: none; }

/* ---------------- Responsive ---------------- */
@media (max-width: 900px) {
  .kicker, .lede, .chain-foot, .links, .colophon p { grid-column: 1 / 13; }
  .lede { max-width: 40ch; }
  .sec-head h2, .sec-note { grid-column: 1 / 13; }
  .sec-note { margin-top: 14px; }
  .elsewhere h2 { grid-column: 1 / 13; padding-top: 0; margin-bottom: 20px; }
  .meta { grid-column: 1 / 13; flex-direction: row; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; margin-bottom: 10px; }
  .content { grid-column: 1 / 13; }
  .proof { grid-column: 1 / 13; margin-top: 16px; }
  nav { grid-column: 3 / 13; justify-content: flex-end; gap: 18px; }
}
@media (max-width: 520px) {
  :root { --t-body: 17px; }
  .links a { grid-template-columns: 1fr; row-gap: 2px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------------- Subpages: CV, case study, research ---------------- */
.doc { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter); max-width: var(--max); margin: 0 auto; padding: clamp(40px, 6vw, 80px) var(--gutter) var(--section); }
.doc-body { grid-column: 3 / 11; max-width: 68ch; }
.doc-body h1 { font-weight: 400; font-size: clamp(36px, 4vw + 12px, 60px); line-height: 1.05; letter-spacing: -0.03em; margin-bottom: 20px; text-wrap: balance; }
.doc-body h2 { margin: 48px 0 14px; padding-top: 14px; border-top: 1px solid var(--rule-strong); }
.doc-body h3 { font-weight: 400; font-size: var(--t-h4); line-height: 1.25; letter-spacing: -0.01em; margin: 28px 0 2px; }
.doc-body p { margin: 0 0 14px; color: var(--ink-2); text-wrap: pretty; }
.doc-body h1 + p { font-size: var(--t-lede); line-height: 1.4; color: var(--ink); }
.doc-body h3 + p i { font-style: normal; font-family: var(--mono); font-size: var(--t-label); color: var(--ink-3); letter-spacing: 0.02em; }
.doc-body ul { margin: 6px 0 14px; padding-left: 1.1em; list-style: square; color: var(--ink-2); }
.doc-body li { margin: 6px 0; padding-left: 4px; text-wrap: pretty; }
.doc-body li::marker { color: var(--ink-3); }
.doc-body b { font-weight: 500; color: var(--ink); }
.doc-body pre { margin: 10px 0 20px; padding: 14px 16px; border: 1px solid var(--rule); overflow-x: auto; font: 400 var(--t-label)/1.6 var(--mono); color: var(--ink-2); }
.colophon a { color: inherit; }
@media (max-width: 900px) { .doc-body { grid-column: 1 / 13; } }