/* Hallmark · macrostructure: Marquee Hero · genre: atmospheric · theme: Terminal
 * tone: technical/austere · anchor hue: cyan · enrichment: generated responsive diagram · nav: N8 · footer: Ft2
 * audience: people evaluating Capsule + contributors · use: understand intent → GitHub
 * pre-emit critique: P5 H5 E5 S5 R5 V4
 * contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46) · chrome: pass (47)
 * tokens: pass (48) · mobile: pass (34, 49, 50–57) · icons: pass (30)
 */
@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@300;400;600;700&display=swap");
@import url("./tokens.css");

* {
  box-sizing: border-box;
}

html,
body {
  overflow-x: clip;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
}

body {
  min-width: 20rem;
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 300;
  line-height: 1.62;
}

::selection {
  background: var(--color-selection);
  color: var(--color-ink);
}

a {
  color: inherit;
  text-decoration-color: var(--color-rule-strong);
  text-decoration-thickness: var(--rule-hair);
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--color-accent-high);
  text-decoration-color: var(--color-accent);
}

a:active {
  color: var(--color-accent);
}

a:focus-visible {
  border-radius: var(--radius-focus);
  outline: var(--rule-focus) solid var(--color-focus);
  outline-offset: var(--space-2xs);
}

a[aria-disabled="true"] {
  color: var(--color-neutral);
  cursor: not-allowed;
  pointer-events: none;
  text-decoration: none;
}

h1,
h2,
h3,
p,
blockquote,
figure,
pre,
dl,
dd {
  margin: 0;
}

h1,
h2,
h3 {
  min-width: 0;
  overflow-wrap: anywhere;
  font-family: var(--font-display);
  font-style: normal;
}

h1 {
  max-width: 18ch;
  font-size: var(--text-display);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 0.98;
}

h2 {
  max-width: 18ch;
  font-size: var(--text-3xl);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h3 {
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.15;
}

.shell {
  width: min(100%, var(--content-max));
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: var(--z-modal);
  padding: var(--space-xs) var(--space-sm);
  transform: translateY(calc(-100% - var(--space-xl)));
  background: var(--color-ink);
  color: var(--color-paper);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.skip-link:focus {
  transform: translateY(0);
}

.nav-term {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-sticky);
  border-block-end: var(--rule-hair) solid var(--color-rule);
  background: color-mix(in oklch, var(--color-paper) 92%, transparent);
  backdrop-filter: blur(var(--blur-nav));
}

.nav-term__inner {
  padding-block: var(--space-sm);
}

.nav-term__line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs) var(--space-sm);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
  white-space: normal;
}

.nav-term__line a {
  color: var(--color-muted);
  white-space: nowrap;
}

.nav-term__line a:hover {
  color: var(--color-accent-high);
}

.prompt,
.caret {
  color: var(--color-accent);
}

.caret {
  display: inline-block;
  width: 1ch;
  animation: blink var(--dur-caret) steps(2) infinite;
}

.status-band {
  border-block-end: var(--rule-hair) solid var(--color-rule);
  background: var(--color-paper-2);
}

.status-band__inner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  padding-block: var(--space-sm);
}

.status-band__inner p {
  max-width: 75ch;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.status-band__mark {
  flex: 0 0 auto;
  width: var(--space-xs);
  height: var(--space-xs);
  margin-block-start: var(--space-xs);
  border: var(--rule-hair) solid var(--color-accent);
  background: var(--color-accent);
}

.hero-marquee {
  min-height: 62svh;
  display: grid;
  align-items: end;
}

.hero-marquee__inner {
  display: grid;
  gap: var(--space-xl);
  padding-block: var(--space-xl) var(--space-2xl);
}

.hero-marquee__summary {
  max-width: 65ch;
  color: var(--color-muted);
  font-size: var(--text-lg);
}

.wordmark {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-md);
  font-weight: 600;
  letter-spacing: -0.025em;
}

.hard-rule {
  height: var(--rule-thick);
  background: var(--color-accent);
}

.overview {
  display: grid;
  gap: var(--space-xl);
  padding-block: var(--space-2xl);
}

.overview__lead {
  display: grid;
  gap: var(--space-lg);
}

.overview__lead > p:not(.link-row),
.head-hang p {
  max-width: 65ch;
  color: var(--color-muted);
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
}

.text-link {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  white-space: nowrap;
}

.scope-note {
  display: grid;
  align-content: start;
  gap: var(--space-lg);
  border-block: var(--rule-hair) solid var(--color-rule-strong);
  padding-block: var(--space-xl);
  color: var(--color-ink);
  line-height: 1.45;
}

.scope-note p {
  color: var(--color-muted);
}

.head-hang {
  display: grid;
  gap: var(--space-lg);
  padding-block: var(--space-xl) var(--space-lg);
}

.boundary,
.concept,
.status,
.requirements {
  padding-block-end: var(--space-2xl);
}

.concept__head {
  padding-block-end: var(--space-lg);
}

.architecture-plate {
  display: grid;
  gap: var(--space-md);
  min-width: 0;
  padding: var(--space-xs);
  background: var(--color-paper-2);
}

.architecture-plate__media {
  min-width: 0;
  overflow: clip;
  background: var(--color-paper);
}

.architecture-plate__media picture,
.architecture-plate__media img {
  display: block;
}

.architecture-plate__media img {
  display: block;
  width: 100%;
  height: auto;
}

.architecture-plate figcaption {
  max-width: 75ch;
  padding: var(--space-xs) var(--space-sm) var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.architecture-plate figcaption strong {
  color: var(--color-ink);
  font-weight: 600;
}

.architecture-plate figcaption code {
  color: var(--color-accent-high);
  font-family: var(--font-mono);
}

.system-map {
  display: grid;
  gap: var(--space-sm);
  margin-block-start: var(--space-lg);
  border-block: var(--rule-hair) solid var(--color-rule-strong);
  padding-block: var(--space-lg);
}

.system-map figcaption {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.system-map pre {
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.55;
  white-space: pre-wrap;
}

.foundation {
  display: grid;
  margin-block-start: var(--space-2xl);
  border-block-start: var(--rule-hair) solid var(--color-rule);
}

.foundation__item {
  display: grid;
  gap: var(--space-xs);
  border-block-end: var(--rule-hair) solid var(--color-rule);
  padding-block: var(--space-lg);
}

.foundation dt {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.foundation dd {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
}

.foundation .foundation__note {
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 300;
}

.docs {
  padding-block-end: var(--space-2xl);
}

.doc-index {
  display: grid;
  border-block-start: var(--rule-hair) solid var(--color-rule-strong);
}

.doc-index a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-lg);
  align-items: baseline;
  border-block-end: var(--rule-hair) solid var(--color-rule-strong);
  padding-block: var(--space-lg);
  text-decoration: none;
}

.doc-index a > span:nth-child(2) {
  grid-column: 1 / -1;
  grid-row: 2;
}

.doc-index a > span:first-child {
  font-family: var(--font-mono);
  font-size: var(--text-md);
  font-weight: 500;
  white-space: nowrap;
}

.doc-index a > span:nth-child(2) {
  color: var(--color-muted);
}

.doc-index a > span:last-child {
  color: var(--color-accent);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.foot-line {
  border-block-start: var(--rule-hair) solid var(--color-rule-strong);
}

.foot-line__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm) var(--space-xl);
  padding-block: var(--space-xl);
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.foot-line a {
  white-space: nowrap;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

@media (min-width: 40rem) {
  .hero-marquee__inner {
    padding-block-end: var(--space-2xl);
  }

  .foundation {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .foundation > div:nth-child(odd) {
    padding-inline-end: var(--space-xl);
  }

  .foundation > div:nth-child(even) {
    border-inline-start: var(--rule-hair) solid var(--color-rule);
    padding-inline-start: var(--space-xl);
  }

  .doc-index a {
    grid-template-columns: minmax(8rem, 0.75fr) minmax(0, 1.6fr) auto;
  }

  .doc-index a > span:nth-child(2) {
    grid-column: auto;
    grid-row: auto;
  }
}

@media (min-width: 60rem) {
  .overview {
    grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
    align-items: start;
  }
}

@media (hover: hover) and (pointer: fine) {
  .doc-index a:hover > span:first-child {
    color: var(--color-accent-high);
  }
}

@media (pointer: coarse) {
  .nav-term__line a,
  .text-link,
  .doc-index a,
  .foot-line a {
    display: inline-flex;
    align-items: center;
    min-height: var(--target-touch);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .caret {
    animation: none;
    opacity: 1;
  }
}