/* Hallmark · pre-emit critique: P5 H5 E4 S5 R5 V4 */
*, *::before, *::after { box-sizing: border-box; }

html {
  color-scheme: light;
  overflow-x: clip;
  scroll-behavior: smooth;
}

body {
  min-width: 20rem;
  margin: 0;
  overflow-x: clip;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.68;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

.skip-link {
  position: absolute;
  inset-block-start: var(--space-md);
  inset-inline-start: var(--space-md);
  z-index: 10;
  padding: var(--space-sm) var(--space-md);
  transform: translateY(-200%);
  background: var(--color-ink);
  color: var(--color-paper);
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus-visible { transform: none; outline: 3px solid var(--color-focus); outline-offset: 3px; }

.nav-mast {
  width: min(100%, var(--measure-wide));
  margin-inline: auto;
  padding: var(--space-md) var(--page-gutter) 0;
  text-align: center;
}

.mast-line {
  margin: 0;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mast-name {
  display: inline-block;
  margin-block: var(--space-xs) var(--space-2xs);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3.5vw, 2.8rem);
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}

.mast-nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 var(--space-lg);
  margin: var(--space-xs) 0 0;
  padding: 0;
  list-style: none;
}

.mast-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

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

.mast-rule {
  height: 5px;
  margin: 0;
  border: 0;
  border-block-start: var(--rule-hair) solid var(--color-rule-strong);
  border-block-end: var(--rule-hair) solid var(--color-rule-strong);
}

main { padding: var(--space-2xl) var(--page-gutter) var(--space-4xl); }

.article {
  width: min(100%, var(--measure));
  margin-inline: auto;
}

.article-title {
  width: 100%;
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 2.4vw + 0.55rem, 3.4rem);
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.08;
  text-wrap: balance;
}

.article-deck {
  margin: var(--space-lg) 0 var(--space-xl);
  color: var(--color-ink-soft);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  line-height: 1.35;
}

.article-lede {
  font-family: var(--font-display);
  font-size: var(--text-md);
  line-height: 1.55;
}

.article > p,
.article > ul,
.article > ol,
.article > blockquote { margin-block: 0 var(--space-lg); }

.article p { overflow-wrap: break-word; }

.article ul,
.article ol { padding-inline-start: var(--space-lg); }

.article li { padding-inline-start: var(--space-xs); }
.article li + li { margin-block-start: var(--space-xs); }

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

.article h2 {
  margin: var(--space-3xl) 0 var(--space-lg);
  padding-block-start: var(--space-lg);
  border-block-start: 4px double var(--color-rule-strong);
  font-size: clamp(1.8rem, 3.4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.article h3 {
  margin: var(--space-2xl) 0 var(--space-md);
  font-size: clamp(1.55rem, 2.5vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.article h3.callout-heading {
  padding-block: var(--space-sm);
  border-block: var(--rule-hair) solid var(--color-rule-strong);
  color: var(--color-accent);
  font-family: var(--font-body);
  font-size: var(--text-md);
  letter-spacing: 0.04em;
}

.article a {
  color: var(--color-accent);
  text-decoration-color: var(--color-rule-strong);
  text-decoration-thickness: var(--rule-hair);
  text-underline-offset: 0.18em;
  overflow-wrap: anywhere;
}

.article a:hover {
  color: var(--color-accent-hover);
  text-decoration-thickness: 2px;
}

.article strong { font-weight: 700; }
.article em { font-style: italic; }

.formula-list {
  margin: var(--space-lg) 0 var(--space-xl);
  padding: var(--space-lg);
  border-block: var(--rule-hair) solid var(--color-rule-strong);
  background: var(--color-paper-raised);
}

.formula-list__group {
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.formula-list ul {
  margin: var(--space-xs) 0 var(--space-md);
}

.formula-list ul:last-child { margin-block-end: 0; }

.formula-list code {
  font-family: var(--font-mono);
  font-size: 0.95em;
  overflow-wrap: anywhere;
}

.article-figure {
  width: 100%;
  margin: var(--space-xl) 0 var(--space-2xl);
}

.article-figure.is-wide {
  width: 100%;
  margin-inline: 0;
  transform: none;
}

.article-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  background: var(--color-paper-raised);
}

.reference-note {
  margin: var(--space-lg) 0;
  padding: var(--space-md) var(--space-lg);
  border-inline-start: 3px solid var(--color-rule-strong);
  background: var(--color-paper-raised);
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.reference-note p { margin: 0; }
.reference-note p + p { margin-block-start: var(--space-sm); }
.reference-note ul { margin: 0; }

.disclaimer {
  margin-block-start: var(--space-3xl) !important;
  padding-block-start: var(--space-lg);
  border-block-start: var(--rule-hair) solid var(--color-rule-strong);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.foot-dense {
  border-block-start: 4px double var(--color-rule-strong);
  padding: var(--space-xl) var(--page-gutter) max(var(--space-xl), env(safe-area-inset-bottom));
  background: var(--color-paper-raised);
}

.foot-dense p {
  width: min(100%, var(--measure-wide));
  margin: 0 auto;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.7;
}

.foot-dense a {
  color: var(--color-accent);
  text-decoration-thickness: var(--rule-hair);
  text-underline-offset: 0.2em;
  white-space: nowrap;
}

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

@media (min-width: 60rem) {
  body { zoom: 0.75; }
}

.article-title + .chapter-heading {
  margin-block-start: var(--space-xl);
}

@media (min-width: 40rem) {
  body { font-size: var(--text-md); }
  main { padding-block-start: var(--space-2xl); }
  .article-deck { font-size: var(--text-xl); }
  .article-lede { font-size: var(--text-lg); }
}

@media (max-width: 39.999rem) {
  .mast-name { font-size: clamp(1.25rem, 6vw, 1.6rem); }
  .mast-nav ul { gap: 0 var(--space-md); }
  .article-title { width: 100%; margin-inline: 0; transform: none; }
  .article-figure.is-wide { width: 100%; margin-inline: 0; transform: none; }
}

@media (pointer: coarse) {
  .mast-nav a,
  .mast-name,
  .foot-dense a { min-height: 44px; }
}

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