/* RK site. Layout: a typesetter's proof sheet. Wide display type, marginal notes, evidence labels as proof marks. */
:root {
  --paper: #F6F6F3;
  --surface: #FFFFFF;
  --ink: #141414;
  --muted: #5C5C56;
  --rule: #DADAD3;
  --accent: #C9221A;
  --shipped: #1D7347;
  --measured: #22549E;
  --research: #9A6100;
  --draft: #6A6A63;
  --font-display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --measure: 66ch;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #121211; --surface: #1A1A18; --ink: #ECECE6; --muted: #A2A29A; --rule: #2E2E2A;
    --accent: #FF5B4F; --shipped: #5CC48F; --measured: #84AAF0; --research: #E2AA45; --draft: #9C9C94;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #121211; --surface: #1A1A18; --ink: #ECECE6; --muted: #A2A29A; --rule: #2E2E2A;
  --accent: #FF5B4F; --shipped: #5CC48F; --measured: #84AAF0; --research: #E2AA45; --draft: #9C9C94;
  color-scheme: dark;
}

* { box-sizing: border-box; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
@media (min-width: 720px) {
  .wrap { padding-left: max(40px, env(safe-area-inset-left, 0px)); padding-right: max(40px, env(safe-area-inset-right, 0px)); }
}
a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3, h4 { font-family: var(--font-display); text-wrap: balance; margin: 0; }
p { margin: 0; }
code { font-family: var(--font-mono); font-size: 0.88em; background: var(--surface); border: 1px solid var(--rule); padding: 1px 5px; border-radius: 2px; }

.mark { color: var(--accent); font-weight: 700; letter-spacing: -0.04em; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* Header */
.top { padding-block: 22px; border-bottom: 1px solid var(--rule); }
.top .wrap { display: flex; align-items: baseline; justify-content: space-between; gap: 14px 24px; flex-wrap: wrap; }
.wordmark { font-family: var(--font-display); font-weight: 900; font-size: 26px; font-stretch: 112%; text-decoration: none; letter-spacing: -0.02em; }
.wordmark span { color: var(--accent); }
nav ul { display: flex; gap: 6px 20px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
nav a { text-decoration: none; font-size: 15px; color: var(--muted); }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); }
nav a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 6px; }

/* Buttons */
.actions { margin-top: 32px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-body); font-weight: 600; font-size: 15px;
  padding: 11px 18px; border-radius: 3px; text-decoration: none; cursor: pointer;
  border: 1.5px solid var(--ink); background: var(--ink); color: var(--paper);
}
.btn.ghost { background: transparent; color: var(--ink); }
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.more { font-family: var(--font-mono); font-size: 13.5px; color: var(--accent); text-decoration: none; }
.more:hover { text-decoration: underline; }

/* Hero (home) */
.hero { padding-block: 72px 64px; }
.hero .wrap { display: grid; gap: 40px; grid-template-columns: 1fr; }
@media (min-width: 960px) { .hero .wrap { grid-template-columns: minmax(0, 1fr) 280px; gap: 64px; align-items: end; } }
.hero h1 { font-size: clamp(44px, 8.4vw, 112px); font-weight: 800; font-stretch: 78%; line-height: 0.92; letter-spacing: -0.02em; margin-top: 18px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.hero .sub { margin-top: 28px; font-size: clamp(19px, 2.1vw, 24px); line-height: 1.45; max-width: 38ch; }
.margin-note { border-left: 2px solid var(--accent); padding-left: 18px; display: grid; gap: 14px; font-size: 15px; color: var(--muted); }
.margin-note strong { color: var(--ink); font-weight: 600; }

/* Inner page head */
.page-head { padding-block: 64px 48px; }
.page-head h1 { font-size: clamp(38px, 6.4vw, 84px); font-weight: 800; font-stretch: 80%; line-height: 0.96; letter-spacing: -0.015em; margin-top: 16px; max-width: 18ch; }
.page-head .lede { margin-top: 24px; font-size: clamp(18px, 1.9vw, 22px); line-height: 1.5; max-width: 52ch; }
.crumb { font-family: var(--font-mono); font-size: 13px; color: var(--muted); text-decoration: none; }
.crumb:hover { color: var(--accent); }

/* Sections */
section { padding-block: 64px; border-top: 1px solid var(--rule); }
.section-head { display: grid; gap: 14px; margin-bottom: 36px; }
@media (min-width: 960px) { .section-head { grid-template-columns: 280px minmax(0, 1fr); gap: 64px; align-items: baseline; } }
.section-head h2 { font-size: clamp(28px, 3.8vw, 44px); font-weight: 750; font-stretch: 85%; line-height: 1.02; letter-spacing: -0.01em; }
.section-head p { color: var(--muted); max-width: var(--measure); }

/* Two-column doc: meta rail + prose */
.doc { display: grid; gap: 36px; grid-template-columns: 1fr; }
@media (min-width: 960px) { .doc { grid-template-columns: 280px minmax(0, 1fr); gap: 64px; } }
.rail { display: grid; gap: 18px; align-content: start; font-size: 14.5px; }
@media (min-width: 960px) { .rail { position: sticky; top: 24px; } }
.rail dl { margin: 0; display: grid; gap: 14px; }
.rail dt { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); }
.rail dd { margin: 2px 0 0; }
.rail .toc { list-style: none; margin: 0; padding: 14px 0 0; border-top: 1px solid var(--rule); display: grid; gap: 6px; }
.rail .toc a { color: var(--muted); text-decoration: none; }
.rail .toc a:hover { color: var(--accent); }

.prose { min-width: 0; max-width: 72ch; }
.prose > * + * { margin-top: 18px; }
.prose h2 { font-size: clamp(26px, 3vw, 34px); font-weight: 750; font-stretch: 86%; line-height: 1.1; margin-top: 56px; scroll-margin-top: 24px; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 21px; font-weight: 700; font-stretch: 92%; margin-top: 32px; }
.prose ul, .prose ol { padding-left: 1.2em; margin-bottom: 0; }
.prose li + li { margin-top: 8px; }
.prose li::marker { color: var(--accent); }
.prose strong { font-weight: 600; }
.prose blockquote { margin-left: 0; margin-right: 0; padding-left: 18px; border-left: 2px solid var(--accent); font-family: var(--font-display); font-stretch: 92%; font-size: 20px; line-height: 1.4; }
.prose .meta-line { font-family: var(--font-mono); font-size: 13px; color: var(--muted); }

.callout { background: var(--surface); border: 1px solid var(--rule); border-left: 3px solid var(--accent); padding: 18px 20px; font-size: 16px; }
.callout b { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 6px; font-weight: 500; }

/* Decision blocks */
.decision { border-top: 2px solid var(--ink); padding-top: 18px; display: grid; gap: 12px; }
.decision .num { font-family: var(--font-mono); font-size: 12.5px; color: var(--accent); letter-spacing: 0.06em; }
.decision h3 { margin-top: 0; }
.tradeoff { font-size: 15.5px; color: var(--muted); }
.tradeoff b { color: var(--ink); font-weight: 600; }

/* Evidence labels */
.label {
  display: inline-block;
  font-family: var(--font-mono); font-size: 11.5px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 3px 8px; border: 1px solid currentColor; border-radius: 2px;
  white-space: nowrap; line-height: 1.4;
}
.l-shipped { color: var(--shipped); }
.l-measured { color: var(--measured); }
.l-research, .l-progress { color: var(--research); }
.l-draft, .l-target { color: var(--draft); }
.legend { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin-top: 6px; font-size: 14px; color: var(--muted); }
.legend span.item { display: inline-flex; gap: 8px; align-items: center; }

/* Ledger */
.ledger { border-top: 2px solid var(--ink); }
.row { display: grid; gap: 6px 24px; grid-template-columns: minmax(0, 1fr) auto; grid-template-areas: "num label" "what what"; padding-block: 20px; border-bottom: 1px solid var(--rule); }
@media (min-width: 760px) { .row { grid-template-columns: 300px minmax(0, 1fr) 130px; grid-template-areas: "num what label"; align-items: baseline; } }
.row .num { grid-area: num; font-family: var(--font-display); font-weight: 750; font-stretch: 80%; font-size: clamp(30px, 4.2vw, 44px); line-height: 1; font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.row .what { grid-area: what; min-width: 0; }
.row .what b { font-weight: 600; }
.row .what small { display: block; color: var(--muted); font-size: 14px; margin-top: 2px; }
.row .label { grid-area: label; justify-self: end; }
.ledger.compact .row { padding-block: 14px; }
.ledger.compact .row .num { font-size: clamp(26px, 3.2vw, 34px); }
@media (min-width: 760px) { .ledger.compact .row { grid-template-columns: 220px minmax(0, 1fr) 130px; } }

/* Work cards */
.work { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); grid-template-columns: 1fr; }
@media (min-width: 820px) { .work { grid-template-columns: 1fr 1fr; } }
.card { background: var(--surface); padding: 32px; display: flex; flex-direction: column; gap: 16px; min-width: 0; text-decoration: none; }
.card .kicker { font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); letter-spacing: 0.04em; }
.card h3 { font-size: clamp(24px, 2.6vw, 30px); font-weight: 720; font-stretch: 88%; line-height: 1.08; }
.card .proof { font-size: 15.5px; }
.card .miss { font-size: 15px; color: var(--muted); border-top: 1px dashed var(--rule); padding-top: 14px; margin-top: auto; }
.card .miss b { color: var(--accent); font-weight: 600; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; text-transform: uppercase; margin-right: 6px; }
a.card:hover h3 { color: var(--accent); }

/* Stack + org */
.lead-grid { display: grid; gap: 48px; grid-template-columns: 1fr; }
@media (min-width: 960px) { .lead-grid { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 64px; } }
.stack { display: grid; gap: 6px; }
.layer { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 16px; align-items: baseline; padding: 16px 18px; background: var(--surface); border: 1px solid var(--rule); }
.layer:first-child { border-color: var(--ink); }
.layer .tag { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); }
.layer h3 { font-size: 21px; font-weight: 720; font-stretch: 90%; display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.layer p { font-size: 14.5px; color: var(--muted); margin-top: 2px; }
@media (max-width: 520px) { .layer { grid-template-columns: 1fr; gap: 4px; } }
.rule-note { margin-top: 18px; font-size: 15px; padding-left: 16px; border-left: 2px solid var(--accent); max-width: 52ch; }
.org h3.sub { font-size: 20px; font-weight: 700; font-stretch: 90%; margin-bottom: 14px; }
.streams { display: grid; gap: 10px; margin-bottom: 32px; }
.stream { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--rule); font-size: 15.5px; }
.stream span:last-child { color: var(--muted); font-size: 14px; text-align: right; }
.ladder { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; align-items: end; }
.rung { border: 1px solid var(--rule); background: var(--surface); padding: 10px; font-size: 13.5px; line-height: 1.3; }
.rung b { display: block; font-family: var(--font-mono); font-size: 12px; color: var(--accent); margin-bottom: 4px; }
.rung:nth-child(1) { min-height: 70px; }
.rung:nth-child(2) { min-height: 92px; }
.rung:nth-child(3) { min-height: 114px; }
.rung:nth-child(4) { min-height: 136px; border-color: var(--ink); }

/* Flow (lifecycle) */
.flow { display: flex; flex-wrap: wrap; gap: 8px 4px; align-items: center; list-style: none; padding: 0; margin: 0; }
.flow li { font-family: var(--font-mono); font-size: 13px; padding: 6px 10px; border: 1px solid var(--rule); background: var(--surface); }
.flow li.arrow { border: 0; background: none; padding: 0 2px; color: var(--muted); }
.flow li.hot { border-color: var(--accent); }
.prose .flow li + li { margin-top: 0; }

/* Bench */
.bench { display: grid; gap: 28px; grid-template-columns: 1fr; }
@media (min-width: 820px) { .bench { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.bench.two { }
@media (min-width: 820px) { .bench.two { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.bench-item { border-top: 2px solid var(--ink); padding-top: 16px; display: grid; gap: 8px; align-content: start; min-width: 0; }
.bench-item h3 { font-size: 20px; font-weight: 700; font-stretch: 92%; }
.bench-item p, .bench-item li { font-size: 15px; color: var(--muted); }
.bench-item ul { margin: 0; padding-left: 1.1em; }
.bench-item li::marker { color: var(--accent); }

/* Quotes */
.quotes { display: grid; gap: 40px; grid-template-columns: 1fr; }
@media (min-width: 960px) { .quotes { grid-template-columns: 1.4fr 1fr 1fr; } }
.quotes.two { }
@media (min-width: 960px) { .quotes.two { grid-template-columns: 1fr 1fr; } }
blockquote.q { margin: 0; display: grid; gap: 16px; align-content: start; }
blockquote.q p { font-family: var(--font-display); font-stretch: 92%; font-weight: 500; font-size: 21px; line-height: 1.35; }
.quotes blockquote.q:first-child p { font-size: clamp(22px, 2.4vw, 27px); }
blockquote.q p::before { content: "\201C"; color: var(--accent); }
blockquote.q p::after { content: "\201D"; color: var(--accent); }
cite { font-style: normal; font-size: 14px; color: var(--muted); }
cite b { color: var(--ink); font-weight: 600; display: block; }

/* Notes list */
.notes { list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--ink); }
.notes li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 24px; padding-block: 20px; border-bottom: 1px solid var(--rule); align-items: baseline; }
.notes h3 { font-size: clamp(20px, 2.2vw, 25px); font-weight: 700; font-stretch: 90%; }
.notes h3 a { text-decoration: none; }
.notes h3 a:hover { color: var(--accent); }
.notes p { grid-column: 1 / -1; color: var(--muted); font-size: 15.5px; max-width: var(--measure); }
.notes .when { font-family: var(--font-mono); font-size: 13px; color: var(--muted); white-space: nowrap; }

.shorts { display: grid; gap: 28px 40px; grid-template-columns: 1fr; }
@media (min-width: 820px) { .shorts { grid-template-columns: 1fr 1fr; } }
.short h3 { font-size: 20px; font-weight: 700; font-stretch: 92%; margin-bottom: 6px; }
.short p { color: var(--muted); font-size: 15.5px; }

/* Tables */
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 15.5px; }
.table-scroll table { min-width: 600px; }
th { text-align: left; font-family: var(--font-mono); font-weight: 500; font-size: 12px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--muted); padding: 0 16px 12px 0; border-bottom: 2px solid var(--ink); vertical-align: bottom; }
td { padding: 14px 16px 14px 0; border-bottom: 1px solid var(--rule); vertical-align: baseline; }
td.yrs { font-family: var(--font-mono); font-size: 14px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
td.co { font-weight: 600; white-space: nowrap; }
td .label { margin-left: 8px; }
.prose table { font-size: 15px; }

/* Toolkit */
.tools { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); grid-template-columns: 1fr; }
@media (min-width: 900px) { .tools { grid-template-columns: 1fr 1fr; } }
.tool { background: var(--surface); padding: 28px; display: grid; gap: 14px; align-content: start; min-width: 0; scroll-margin-top: 24px; }
.tool h3 { font-size: 23px; font-weight: 720; font-stretch: 88%; }
.tool .use { font-size: 14.5px; color: var(--muted); }
.tool .use b { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.07em; text-transform: uppercase; color: var(--accent); font-weight: 500; margin-right: 6px; }
.tool ol, .tool ul { margin: 0; padding-left: 1.25em; font-size: 15.5px; display: grid; gap: 6px; }
.tool li::marker { color: var(--accent); font-family: var(--font-mono); font-size: 13px; }
.tool table { font-size: 14.5px; }
.tool .rank { font-family: var(--font-display); font-weight: 650; font-stretch: 90%; font-size: 19px; line-height: 1.5; }
.tool .rank span { color: var(--accent); padding: 0 6px; }

/* Path */
.stages { list-style: none; margin: 0; padding: 0; display: grid; }
.stage { display: grid; gap: 10px 40px; padding-block: 28px; border-top: 1px solid var(--rule); grid-template-columns: 1fr; }
.stage:first-child { border-top: 2px solid var(--ink); }
@media (min-width: 900px) { .stage { grid-template-columns: 160px minmax(0, 1fr) minmax(0, 1fr); } }
.stage .yrs { font-family: var(--font-mono); font-size: 13.5px; color: var(--muted); font-variant-numeric: tabular-nums; }
.stage h3 { font-size: 23px; font-weight: 720; font-stretch: 88%; }
.stage .where { font-size: 15px; color: var(--muted); margin-top: 4px; }
.stage .lesson { font-family: var(--font-display); font-stretch: 92%; font-size: 19px; line-height: 1.4; padding-left: 16px; border-left: 2px solid var(--accent); }

/* Chapters */
.chapter { padding-block: 56px; border-top: 1px solid var(--rule); scroll-margin-top: 16px; }
.chapter:first-of-type { border-top: 0; }

/* Doors */
.doors { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); grid-template-columns: 1fr; }
@media (min-width: 820px) { .doors { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.door { background: var(--surface); padding: 28px; display: grid; gap: 10px; text-decoration: none; align-content: start; }
.door h3 { font-size: 22px; font-weight: 720; font-stretch: 90%; }
.door p { color: var(--muted); font-size: 15px; }
.door .go { font-family: var(--font-mono); font-size: 13px; color: var(--accent); }
.door:hover h3 { color: var(--accent); }

/* Next/prev */
.pager { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); grid-template-columns: 1fr; }
@media (min-width: 720px) { .pager { grid-template-columns: 1fr 1fr; } }
.pager a { background: var(--surface); padding: 22px 24px; text-decoration: none; display: grid; gap: 4px; }
.pager a span { font-family: var(--font-mono); font-size: 12px; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; }
.pager a b { font-family: var(--font-display); font-stretch: 90%; font-size: 20px; font-weight: 700; }
.pager a:hover b { color: var(--accent); }
.pager a.next { text-align: right; }

/* Footer */
footer { padding-block: 64px 48px; border-top: 1px solid var(--rule); }
footer .wrap { display: grid; gap: 26px; }
footer h2 { font-size: clamp(30px, 5vw, 58px); font-weight: 800; font-stretch: 80%; line-height: 1; max-width: 20ch; }
.contact { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.email { font-family: var(--font-mono); font-size: 16px; padding: 10px 14px; border: 1px solid var(--rule); background: var(--surface); user-select: all; border-radius: 3px; }
.fine { color: var(--muted); font-size: 13.5px; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 6px 18px; list-style: none; margin: 0; padding: 0; font-size: 14px; }
.foot-nav a { color: var(--muted); text-decoration: none; }
.foot-nav a:hover { color: var(--accent); }
.copied { font-size: 14px; color: var(--shipped); }

@media (prefers-reduced-motion: no-preference) {
  .btn, .door h3, nav a, .card h3, .pager b { transition: color .15s, background-color .15s, border-color .15s; }
}

span.yrs { font-family: var(--font-mono); font-size: 14px; color: var(--muted); white-space: nowrap; font-variant-numeric: tabular-nums; }
td a { text-decoration: none; }
td a:hover b { color: var(--accent); }

/* Keep every grid track shrinkable so wide content scrolls inside its own box */
.tools, .work, .doors, .pager, .bench, .quotes, .shorts, .doc, .lead-grid { grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .tools { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 820px) { .work { grid-template-columns: repeat(2, minmax(0, 1fr)); } .doors, .bench { grid-template-columns: repeat(3, minmax(0, 1fr)); } .bench.two, .shorts { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 720px) { .pager { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 960px) { .doc { grid-template-columns: 280px minmax(0, 1fr); } .lead-grid { grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); } .quotes { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr); } .quotes.two { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.tool .table-scroll table { min-width: 520px; }

.tool, .bench-item, blockquote.q, .decision { grid-template-columns: minmax(0, 1fr); }
.tool > *, .decision > *, .prose > * { min-width: 0; }