/* Voided / static identity. Motion belongs to the remold transition, not the layout. */
:root {
  --ink: #101211;
  --ink-soft: #161916;
  --ink-raised: #202420;
  --paper: #eeeae1;
  --paper-soft: #c7c9c0;
  --muted: #a1a79c;
  --line: #363c34;
  --line-strong: #596050;
  --signal: #c7ff5e;
  --max: 1320px;
  --header-height: 80px;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
body { letter-spacing: -.012em; }
button, select, textarea, input { border-radius: 0; }
button, a { touch-action: manipulation; }
@layer base {
  h1, h2, h3 { font-weight: 500; text-wrap: pretty; }
  h1 { font-size: clamp(3rem, 7vw, 6.2rem); letter-spacing: -.065em; line-height: .98; }
  h2 { font-size: clamp(2.4rem, 5vw, 4.5rem); letter-spacing: -.055em; line-height: 1.03; }
  h3 { letter-spacing: -.025em; }
}
p { line-height: 1.65; }
pre, code { white-space: pre-wrap; overflow-wrap: anywhere; }
input, textarea, select { min-width: 0; }
.site-header, .site-header.is-overlay { position: relative; inset: auto; background: var(--ink); backdrop-filter: none; }
.site-header__inner, .section__inner, .hero__inner, .contract-strip__inner, .site-footer__inner { width: min(100% - 80px, var(--max)); }
.brand { font: 750 1.02rem var(--sans); letter-spacing: .13em; }
.brand__mark { width: 19px; height: 24px; background: var(--paper); clip-path: polygon(0 0,30% 0,50% 66%,70% 0,100% 0,66% 100%,34% 100%); }
.site-nav { gap: 30px; font: .74rem var(--mono); }
.site-nav a { min-height: 44px; display: inline-flex; align-items: center; position: relative; }
.site-nav a[aria-current="page"] { color: var(--signal); }
.site-nav a[aria-current="page"]::after { position: absolute; bottom: 0; height: 3px; width: 16px; margin: 0; }
.header-search { min-height: 40px; border-color: var(--line); background: transparent; color: var(--paper-soft); }
.eyebrow, .lab-kicker, .chapter-number { font: .67rem var(--mono); letter-spacing: .09em; }
.eyebrow { display: block; margin-bottom: 20px; color: var(--muted); }
.eyebrow::before { display: none; }
.button { min-height: 48px; gap: 28px; border-color: var(--line-strong); padding-inline: 22px; font: .76rem var(--mono); letter-spacing: 0; transition: background 140ms, color 140ms, border-color 140ms; }
.button:hover { transform: none; }
.button--signal { background: var(--signal); border-color: var(--signal); color: #192300; }
.button--signal:hover { background: #ddff9c; color: #192300; border-color: #ddff9c; }
.text-link { font: .76rem var(--mono); padding-block: 12px; gap: 24px; }
.text-link:hover .arrow { transform: none; }
.hero.hero--focused { min-height: 0; padding: 32px 0 0; overflow: visible; background: var(--ink); }
.hero--focused .hero__inner { display: block; min-height: 0; padding: 0; }
.hero__register, .hero__index { display: flex; justify-content: space-between; align-items: center; gap: 20px; font: .65rem var(--mono); letter-spacing: .05em; color: var(--muted); }
.voided-wordmark { width: 100%; height: auto; margin: 38px 0 45px; }
.hero--focused .hero__copy { display: grid; grid-template-columns: 1fr 1fr; gap: 9%; max-width: none; padding: 0 0 52px; align-items: end; }
.hero--focused h1 { font-size: clamp(2.5rem, 4.8vw, 4.7rem); letter-spacing: -.065em; line-height: .98; max-width: none; }
.hero--focused h1 span { display: inline; color: var(--muted); }
.hero--focused .hero__lede { max-width: 450px; margin: 0; font-size: clamp(1rem,1.4vw,1.22rem); color: var(--paper-soft); }
.hero__actions { gap: 24px; margin-top: 25px; align-items: center; }
.hero__index { border-top: 1px solid var(--line); padding-block: 20px; }
.hero__index a { color: var(--paper-soft); }
.hero__index a:hover { color: var(--signal); }
.contract-strip { border: 0; background: var(--ink-raised); }
.contract-strip__inner { min-height: 66px; justify-content: space-between; gap: 12px; font-size: .74rem; }
.contract-strip__inner strong { color: var(--signal); }
.section, .section--compact { padding: 96px 0; }
.contract-strip { padding-inline: 0; }
.section + .section { border-top: 1px solid var(--line); }
.section__intro { gap: 10%; align-items: end; margin-bottom: 42px; }
.section__intro > div:first-child { max-width: 650px; }
.section__intro > p, .section__intro > div > p { max-width: 475px; font-size: 1rem; }
.section__title { max-width: 700px; font-size: clamp(2.65rem,4.7vw,4.6rem); }
.section--light { background: var(--paper); color: var(--ink); }
.section--light p, .section--light .eyebrow { color: #50564b; }
.section--light .text-link { color: #263516; }
.section--signal { background: var(--paper); color: var(--ink); }
.section--signal .eyebrow { color: #50564b; }
.section--signal .button { color: var(--paper); background: var(--ink); border-color: var(--ink); }
.section--signal .button--quiet { color: var(--ink); background: transparent; }
.function-lab { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); grid-template-areas: "head head" "key code" "keyraw code" "input code" "operation code" "actions code" "output output" "trace trace" "note note"; gap: 20px 36px; padding: 28px 0 0; border: 0; border-top: 2px solid var(--paper); box-shadow: none; background: transparent; min-width: 0; }
.function-lab > * { min-width: 0; margin: 0; }
.function-lab__header { grid-area: head; padding-bottom: 22px; margin-bottom: 2px; border-bottom: 1px solid var(--line); }
.function-lab__header h2 { font-size: 1.6rem; margin-top: 6px; }
.function-lab__key { grid-area: key; border: 0; background: none; padding: 0; }
.lab-raw--key { grid-area: keyraw; }
.function-lab > .lab-field { grid-area: input; }
.lab-operation { grid-area: operation; }
.lab-invocation { grid-area: code; align-self: stretch; border: 1px solid var(--line); background: #0a0c0a; }
.lab-invocation__header { background: #20251d; }
.lab-invocation pre { padding: 24px; font-size: .78rem; line-height: 1.8; }
.function-lab__actions { grid-area: actions; }
.lab-output { grid-area: output; background: #20271a; border: 1px solid #4d6238; padding: 16px; }
.lab-roundtrip { grid-area: trace; }
.lab-note { grid-area: note; color: var(--muted); font-size: .75rem; max-width: none; }
.lab-field textarea { min-height: 125px; border-color: var(--line-strong); background: #0a0c0a; color: var(--paper); padding: 16px; }
.lab-button, .lab-invocation__header button, .lab-language-switch button, .lab-raw__header button { min-height: 40px; }
.lab-raw { padding: 12px 16px; border-color: var(--line); background: var(--ink-soft); }
.lab-raw pre { overflow-wrap: anywhere; }
.lab-roundtrip__stages { gap: 1px; background: var(--line); border: 1px solid var(--line); }
.lab-stage { background: var(--ink-soft); border: 0; padding: 24px; }
.lab-stage > header > span { background: var(--signal); color: var(--signal-ink); }
.lab-value code { line-height: 1.7; }
.lab-segmented { gap: 4px; }
.lab-segmented button { min-height: 44px; padding-inline: 12px; }
.path-switcher { margin-top: 0; border-color: var(--line); background: transparent; }
.path-tab { padding: 24px; background: transparent; border-color: var(--line); }
.path-tab[aria-selected="true"] { background: var(--ink-raised); }
.path-output { padding: 28px; background: var(--ink-soft); }
.code-window { border-color: var(--line); background: #0a0c0a; box-shadow: none; }
.code-window__bar { background: var(--ink-raised); border-color: var(--line); }
.code-window pre { padding: 24px; }
.boundary-grid { margin-top: 32px; }
.boundary-column { padding: 28px; }
.boundary-column h3 { font-size: 1.75rem; margin-block: 12px 24px; }
.plain-list li::before { content: "+"; font-family: var(--mono); }
.endpoint-list { margin-top: 36px; }
.endpoint-row { min-height: 88px; }
.endpoint-row:hover { padding-inline: 0; background: var(--ink-soft); }
.endpoint-row__kind { color: var(--muted); font-size: .65rem; }
.endpoint-row p { font-size: .85rem; }
.feature-grid { gap: 0; border-top: 1px solid var(--line); }
.feature-card { border: 0; border-right: 1px solid var(--line); background: transparent; box-shadow: none; padding: 28px; }
.feature-card:hover { transform: none; background: var(--ink-soft); }
.final-cta h2 { font-size: clamp(2.8rem,5vw,5.1rem); }
.site-footer { padding-block: 48px; border-top: 1px solid var(--line); }
.site-footer nav { gap: 18px 28px; font: .69rem var(--mono); }
.site-footer__meta { font-size: .75rem; max-width: 390px; }
/* Interior pages share the same register, scale and surface treatment. */
.page-hero { padding-block: 70px 56px; background: var(--ink); }
.page-hero h1 { max-width: 1000px; font-size: clamp(3rem,6.3vw,6rem); }
.page-hero p { max-width: 640px; font-size: 1.04rem; }
.course-hero { width: min(100% - 80px,var(--max)); gap: 60px; padding-block: 64px 56px; }
.course-hero .course-hero__copy h1 { font-size: clamp(3rem,5.8vw,5.5rem); }
.course-hero__machine { box-shadow: none; background: #191e16; border-color: var(--line-strong); }
.course-hero__machine::before { content: "PLAINTEXT → PROTECTED ARTIFACT → PLAINTEXT"; }
.course-hero__lede { font-size: 1rem; }
.course-map { width: min(100% - 80px,var(--max)); }
.course-chapter, .course-check { width: min(100% - 80px,var(--max)); padding-block: 72px; }
.course-chapter__heading { margin-bottom: 34px; }
.course-chapter__heading h2 { max-width: 820px; font-size: clamp(2.5rem,4vw,4rem); }
.chapter-number { color: var(--muted); margin-bottom: 18px; }
.course-chapter__heading > p { font-size: 1rem; max-width: 750px; }
.course-hero__visual, .signal-stage, .transform-lab, .key-model-lab, .journey-lab, .tamper-lab, .kdf-lab, .system-finale { box-shadow: none; border-color: var(--line-strong); }
.course-lab, .course-check { box-shadow: none; }
.docs-shell { max-width: 1520px; }
.docs-guide__header h1 { font-size: clamp(3rem,5vw,5rem); }
.docs-guide__header { padding-bottom: 34px; border-bottom: 1px solid var(--line); margin-bottom: 36px; }
.docs-guide__header p { font-size: 1rem; max-width: 750px; }
.docs-sidebar__course { background: transparent; border-color: var(--line); padding: 16px 0; }
.docs-sidebar__course span { color: var(--muted); }
.docs-nav-button { min-height: 42px; padding-left: 14px; border: 0; border-left: 2px solid transparent; font-size: .81rem; }
.docs-nav-button[aria-current="page"] { background: #20261a; border-left-color: var(--signal); color: var(--paper); }
.docs-section h2 { font-size: 2rem; }
.docs-section h3 { font-size: 1.3rem; }
.docs-toc { font-size: .75rem; }
.callout { border: 1px solid var(--line-strong); border-left-width: 1px; background: var(--ink-raised); padding: 20px 24px; }
.decision-table th { font: .65rem var(--mono); letter-spacing: .06em; color: var(--muted); }
.decision-table td { font-size: .85rem; }
.search-dialog { border-color: var(--line-strong); box-shadow: 0 30px 100px #0008; }
@media (max-width: 1000px) {
  .site-header__inner, .section__inner, .hero__inner, .contract-strip__inner, .site-footer__inner, .course-hero, .course-map, .course-chapter, .course-check { width: calc(100% - 48px); }
  .hero--focused .hero__copy { gap: 6%; }
  .function-lab { gap: 18px 24px; }
  .lab-segmented { flex-wrap: wrap; }
  .section, .section--compact { padding-block: 72px; }
}
@media (max-width: 700px) {
  :root { --header-height: 66px; }
  .site-header__inner, .section__inner, .hero__inner, .contract-strip__inner, .site-footer__inner, .course-hero, .course-map, .course-chapter, .course-check { width: calc(100% - 36px); }
  .hero.hero--focused { padding-top: 24px; }
  .hero__register { font-size: .51rem; gap: 12px; letter-spacing: 0; }
  .voided-wordmark { margin-block: 26px 32px; }
  .hero--focused .hero__copy { grid-template-columns: 1fr; gap: 24px; padding-bottom: 32px; }
  .hero--focused h1 { font-size: clamp(2.65rem,10vw,4rem); }
  .hero--focused .hero__lede { max-width: 33ch; }
  .hero__actions { gap: 20px; flex-wrap: wrap; margin-top: 24px; }
  .hero__index { display: grid; gap: 10px; font-size: .6rem; }
  .contract-strip__inner { flex-wrap: wrap; justify-content: center; padding-block: 18px; font-size: .62rem; gap: 8px; }
  .section, .section--compact { padding-block: 54px; }
  .section__intro { display: grid; grid-template-columns: 1fr; gap: 22px; margin-bottom: 30px; }
  .section__title { font-size: clamp(2.45rem,9vw,3.4rem); }
  .eyebrow { margin-bottom: 16px; }
  .function-lab { display: flex; flex-direction: column; gap: 20px; padding-top: 20px; }
  .function-lab__header { margin: 0; padding-bottom: 18px; }
  .function-lab__header h2 { font-size: 1.5rem; }
  .function-lab__header .lab-state { max-width: 108px; text-align: right; font-size: .57rem; }
  .function-lab__key, .lab-raw--key, .lab-field, .lab-operation, .lab-invocation, .lab-roundtrip, .lab-note { width: 100%; }
  .function-lab__key { gap: 12px; }
  .lab-segmented { display: grid; grid-template-columns: 1fr; }
  .lab-segmented button { text-align: left; padding: 12px 16px; font-size: .72rem; }
  .function-lab__actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: end; }
  .function-lab__actions .button { padding-inline: 12px; gap: 8px; font-size: .67rem; }
  .lab-invocation pre { padding: 18px; font-size: .72rem; }
  .lab-stage { padding: 18px; }
  .lab-roundtrip__header { align-items: start; }
  .path-output { padding: 20px; }
  .path-tabs { display: flex; }
  .path-tab { padding: 15px 12px; flex: 1; }
  .path-tab small { display: none; }
  .path-tab strong { font-size: .86rem; }
  .code-window pre { padding: 18px; font-size: .72rem; }
  .boundary-column { padding: 24px 0; }
  .endpoint-row { gap: 10px; padding-block: 22px; }
  .endpoint-row:hover { padding-block: 22px; }
  .feature-card { padding: 24px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .page-hero { padding-block: 44px 38px; }
  .page-hero h1 { font-size: 3.2rem; }
  .course-hero { grid-template-columns: 1fr; gap: 32px; padding-block: 44px; }
  .course-hero .course-hero__copy h1 { font-size: 3.2rem; }
  .course-chapter, .course-check { padding-block: 48px; }
  .course-chapter__heading h2 { font-size: 2.5rem; }
  .docs-guide__header h1 { font-size: 3rem; }
  .docs-section h2 { font-size: 1.75rem; }
  .site-footer { padding-block: 36px; }
}