/* Hallmark · macrostructure: Index-First · theme: Plain · tone: technical · anchor hue: blue */
@import url("./tokens.css");

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  overflow-x: clip;
}

html {
  scroll-behavior: smooth;
  background: var(--color-paper);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.page {
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: var(--space-3xl);
  width: min(76rem, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: var(--space-2xl) 0 var(--space-3xl);
}

.toc {
  position: sticky;
  top: var(--space-2xl);
  align-self: start;
  display: grid;
  gap: var(--space-md);
  height: fit-content;
}

.toc__brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc__role {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-ink-soft);
  letter-spacing: 0.04em;
}

.toc__list {
  margin: 0;
  padding: var(--space-md) 0 0;
  list-style: none;
  border-top: 1px solid var(--color-rule);
  display: grid;
  gap: var(--space-2xs);
}

.toc__list a {
  display: grid;
  grid-template-columns: 3ch 1fr;
  gap: var(--space-sm);
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-ink-soft);
  padding: 0.1rem 0;
  transition: color var(--dur-micro) var(--ease-out);
}

.toc__list a:hover,
.toc__list a:focus-visible {
  color: var(--color-accent);
}

.toc__list .num {
  color: var(--color-accent);
}

.toc__meta {
  border-top: 1px solid var(--color-rule);
  padding-top: var(--space-sm);
  display: grid;
  gap: var(--space-3xs);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-ink-muted);
}

.main {
  min-width: 0;
}

.section {
  margin-bottom: var(--space-3xl);
  scroll-margin-top: var(--space-2xl);
}

.section__num {
  margin: 0 0 var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section__head {
  margin: 0 0 var(--space-lg);
  font-family: var(--font-display);
  font-size: clamp(2rem, 3vw, 3rem);
  line-height: 1.03;
  letter-spacing: -0.03em;
}

.section__head--lede {
  font-size: clamp(2.6rem, 5vw, 4.25rem);
  max-width: 12ch;
}

.section__body {
  max-width: 60ch;
  color: var(--color-ink);
}

.section__body p {
  margin: 0 0 var(--space-md);
}

.section__body p:last-child {
  margin-bottom: 0;
}

.leadline {
  font-size: 1.05rem;
  font-weight: 600;
}

.muted {
  color: var(--color-ink-soft);
}

.metrics {
  margin-top: var(--space-lg);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-sm);
}

.metrics > div {
  border-top: 1px solid var(--color-rule);
  padding-top: var(--space-sm);
}

.metrics__value {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.55rem, 2.3vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
}

.metrics__label {
  display: block;
  margin-top: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-ink-soft);
}

.prose-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: var(--space-lg);
  align-items: start;
}

.system-table,
.stack-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.system-table thead th,
.stack-table th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  font-weight: 500;
  text-align: left;
}

.system-table th,
.system-table td,
.stack-table th,
.stack-table td {
  border-bottom: 1px solid var(--color-rule);
  padding: var(--space-sm) var(--space-md) var(--space-sm) 0;
  vertical-align: top;
}

.system-table tbody td:first-child,
.stack-table th {
  width: 18ch;
  font-weight: 600;
}

.bullet-list,
.mini-list {
  margin: var(--space-md) 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.7rem;
}

.bullet-list {
  color: var(--color-ink);
}

.mini-list {
  color: var(--color-ink);
}

.proof-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
}

.proof-wide {
  grid-column: 1 / -1;
}

.contact-list {
  display: grid;
  gap: var(--space-sm);
}

.contact-row {
  display: grid;
  grid-template-columns: 8ch 1fr;
  gap: var(--space-md);
  padding: var(--space-sm) 0;
  border-top: 1px solid var(--color-rule);
}

.contact-row span {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-ink-soft);
}

.contact-row a {
  border-bottom: 1px solid var(--color-rule);
  width: fit-content;
}

.contact-row a:hover,
.contact-row a:focus-visible {
  border-bottom-color: var(--color-accent);
}

@media (max-width: 920px) {
  .page {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
    width: min(100%, calc(100% - 1.5rem));
    padding-top: var(--space-lg);
  }

  .toc {
    position: static;
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-rule);
  }

  .metrics,
  .prose-grid,
  .proof-grid {
    grid-template-columns: 1fr;
  }

  .proof-wide {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  .section__head--lede {
    max-width: 11ch;
  }

  .contact-row {
    grid-template-columns: 1fr;
    gap: var(--space-2xs);
  }

  .system-table,
  .stack-table {
    display: block;
    overflow-x: auto;
  }

  .system-table thead,
  .stack-table thead {
    display: none;
  }

  .system-table tbody,
  .system-table tr,
  .stack-table tbody,
  .stack-table tr {
    display: block;
  }

  .system-table td,
  .stack-table th,
  .stack-table td {
    display: block;
    width: 100%;
    padding-right: 0;
  }

  .system-table tr,
  .stack-table tr {
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-rule);
  }

  .system-table td:first-child,
  .stack-table th {
    border-bottom: none;
    padding-bottom: 0;
  }
}