/* ==========================================================================
   Onyx — premium dark theme
   Home / section grid ported from the dark-tech blog grid.
   Article ported from the velvet-shaker blog page.
   Self-hosted fonts only, no external resources.
   ========================================================================== */

/* --------------------------------------------------------------- fonts -- */

/* Inter, latin subset, variable weight axis 400–600 */
@font-face {
  font-family: "Onyx Sans";
  src: url("/assets/fonts/inter-latin.woff2") format("woff2");
  font-weight: 400 600;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

/* JetBrains Mono, latin subset — labels, meta, numbers, code */
@font-face {
  font-family: "Onyx Mono";
  src: url("/assets/fonts/jetbrains-mono-400-latin.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193,
    U+2212, U+2215, U+FEFF, U+FFFD;
}

/* --------------------------------------------------------------- tokens -- */

:root {
  /* surfaces — near black, warm off-white ink */
  --bg: #0b0b0b;
  --surface: #141414;
  --surface-2: #1b1b1b;
  --ink: #f2ede3;          /* 16.9:1 on --bg  */
  --ink-dim: #b9b2a6;      /*  9.3:1 on --bg  */
  --line: rgba(242, 237, 227, 0.14);
  --line-strong: rgba(242, 237, 227, 0.32);

  /* brand colours arrive from head_meta as --c-primary / --c-accent /
     --c-primary-contrast; they are used only as restrained accents */

  --sans: "Onyx Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --mono: "Onyx Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --wrap: 1600px;
  --gutter: 24px;
  --band: 80px;      /* section rhythm  */
  --gap: 24px;       /* grid gutter     */
  --colgap: 140px;   /* article columns */

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ----------------------------------------------------------------- base -- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

img, svg { max-width: 100%; }
img { height: auto; display: block; border: 0; }

a { color: inherit; }

h1, h2, h3, h4 {
  font-weight: 500;
  letter-spacing: -0.015em;
  text-wrap: balance;
  margin: 0;
}

.mono {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dim { color: var(--ink-dim); }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 50;
  background: var(--ink);
  color: var(--bg);
  padding: 0.75rem 1.25rem;
  font: 400 0.9rem/1 var(--mono);
  text-decoration: none;
}
.skip:focus { left: 0; }

/* --------------------------------------------------------------- header -- */

.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(11, 11, 11, 0.88);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.site-head-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 76px;
  padding-block: 0.75rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark { width: 28px; height: 28px; border-radius: 50%; }
.brand-name {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.9rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav a {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  text-decoration: none;
  padding-block: 0.35rem;
  border-bottom: 1px solid transparent;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}
.site-nav a:hover { color: var(--ink); border-bottom-color: var(--c-accent); }
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--c-accent);
}

/* ---------------------------------------------------------- breadcrumbs -- */

.crumbs { padding-top: 2.5rem; }
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.crumbs li + li::before {
  content: "/";
  margin-right: 0.75rem;
  color: var(--line-strong);
}
.crumbs a { color: var(--ink-dim); text-decoration: none; }
.crumbs a:hover { color: var(--ink); text-decoration: underline; }
.crumbs [aria-current="page"] { color: var(--ink); }

/* ----------------------------------------------------------------- hero -- */

.intro { padding-block: 168px 52px; }
.kicker {
  margin: 0 0 1.5rem;
  color: var(--ink-dim);
  letter-spacing: 0.16em;
}
.intro-t {
  font-size: 4rem;
  line-height: 1.1;
  margin: 0;
  max-width: 20ch;
}
.intro-lead {
  margin: 1.75rem 0 0;
  max-width: 46ch;
  font-size: 1.35rem;
  line-height: 1.5;
  color: var(--ink-dim);
}
.cta-row { margin: 2.5rem 0 0; }

/* ---------------------------------------------------------------- bands -- */

.band { padding-block: var(--band); }
.band-tight { padding-block: calc(var(--band) / 2); }
.band-quiet {
  padding-block: var(--band);
  border-top: 1px solid var(--line);
}

.headrow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: var(--band);
}
.headrow-t {
  font-size: 3.25rem;
  line-height: 1.15;
  margin: 0;
}
.band-note {
  margin: calc(var(--band) * -0.75) 0 var(--band);
  max-width: 52ch;
  color: var(--ink-dim);
  font-size: 1.1rem;
}

/* ----------------------------------------------------------------- pill -- */

.pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  height: 52px;
  padding: 4px 28px;
  border: 1px solid var(--ink);
  border-radius: 70px;
  background: transparent;
  color: var(--ink);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.3s var(--ease), background-color 0.3s var(--ease),
    border-color 0.3s var(--ease);
}
.pill .arrow { transition: transform 0.3s var(--ease); }
.pill:hover {
  background: var(--c-primary);
  border-color: var(--c-primary);
  color: var(--c-primary-contrast);
}
.pill:hover .arrow { transform: translateX(5px); }

.pill-sm {
  height: 44px;
  padding: 4px 20px;
  font-size: 0.85rem;
  border-color: var(--line-strong);
  color: var(--ink-dim);
}
.pill-sm:hover { color: var(--c-primary-contrast); }
.pill-pre { color: var(--c-accent); margin-right: 0.35rem; }
.pill-n {
  margin-left: 0.6rem;
  font-size: 0.7rem;
  color: inherit;
  opacity: 0.75;
}

.pill-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.pill-group + .pill-group { margin-top: 2.5rem; }
.pill-label {
  margin: 0 0 1rem;
  color: var(--ink-dim);
  letter-spacing: 0.16em;
}

/* ----------------------------------------------------------- card grid -- */

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
  list-style: none;
  margin: 0;
  padding: 0;
}
.grid-cell { display: flex; }

.card { display: flex; width: 100%; }
.card-link {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  width: 100%;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  transition: background-color 0.35s var(--ease);
}
.card-link:hover { background: var(--surface-2); }

.card-media {
  position: relative;
  width: 100%;
  padding-top: 72%;
  overflow: hidden;
  background: var(--surface-2);
}
.card-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease);
}
.card-link:hover .card-media img { transform: scale(1.06); }

.card-media-blank {
  display: grid;
  place-items: center;
  padding-top: 40%;
  border-bottom: 1px solid var(--line);
}
.blank-mark {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--mono);
  font-size: 3rem;
  color: var(--line-strong);
}

.card-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  flex: 1;
  width: 100%;
  gap: var(--gap);
  position: relative;
  padding: 32px 32px 88px;
}
.card-kicker {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}
.card-kicker .sep { color: var(--line-strong); }
.card-type {
  color: var(--ink);
}
.card-type::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 0.55rem;
  background: var(--c-accent);
  vertical-align: middle;
}
.card-title {
  font-size: 1.8rem;
  line-height: 1.25;
  margin: 0;
}
.card-excerpt {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink-dim);
}
.card-date {
  margin: 0;
  font-size: 0.7rem;
  color: var(--ink-dim);
  letter-spacing: 0.08em;
}
.card-arrow {
  position: absolute;
  bottom: 32px;
  left: 32px;
  color: var(--ink);
  transition: transform 0.35s var(--ease), color 0.35s var(--ease);
}
.card-link:hover .card-arrow {
  transform: translateX(8px);
  color: var(--c-accent);
}
.arrow { display: block; }

/* -------------------------------------------------------------- hub rows -- */

.hub-list { list-style: none; margin: 0; padding: 0; }
.hub-row { border-top: 1px solid var(--line); }
.hub-row:last-child { border-bottom: 1px solid var(--line); }
.hub-link {
  display: grid;
  grid-template-columns: minmax(12ch, 22%) 1fr auto auto;
  align-items: center;
  gap: 1.5rem;
  padding-block: 1.75rem;
  text-decoration: none;
  color: var(--ink);
  transition: color 0.3s var(--ease);
}
.hub-t { font-size: 1.35rem; }
.hub-s { color: var(--ink-dim); font-size: 1rem; }
.hub-n { color: var(--ink-dim); font-size: 0.75rem; }
.hub-link:hover { color: var(--ink); background: var(--surface); }
.hub-link:hover .arrow { color: var(--c-accent); }
.hub-link:hover .arrow { transform: translateX(6px); }
.hub-link .arrow { transition: transform 0.3s var(--ease); }

/* ------------------------------------------------------- article layout -- */

.doc-hero { padding-block: 168px 52px; }
.doc-title {
  font-size: 6.375rem;
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin: 0;
  hyphens: auto;
}
.doc-title-sm { font-size: 4rem; letter-spacing: -0.02em; }
.doc-lead {
  margin: 2rem 0 0;
  max-width: 52ch;
  font-size: 1.5rem;
  line-height: 1.45;
  color: var(--ink-dim);
}

.doc-shot { margin: 0; }
.doc-shot-frame {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: var(--surface);
}
.doc-shot img { width: 100%; height: auto; }
.doc-shot figcaption {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
}

.doc-body { padding-block: 70px; }
.doc-cols {
  display: grid;
  grid-template-columns: 1fr 2fr;
  column-gap: var(--colgap);
  align-items: start;
}

/* left meta column: rows separated by hairlines */
.doc-meta { position: sticky; top: 108px; }
.meta-rows { margin: 0; }
.meta-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  border-top: 1px solid var(--line-strong);
  padding-block: 24px;
}
.meta-row:last-child { border-bottom: 1px solid var(--line-strong); }
.meta-row dt {
  color: var(--ink-dim);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}
.meta-row dd {
  margin: 0;
  text-align: right;
  font-size: 0.95rem;
  line-height: 1.5;
}
.meta-row dd a { color: var(--ink); text-decoration-color: var(--c-accent); }
.checked {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  text-transform: none;
}
.checked::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 0.5rem;
  border-radius: 50%;
  background: var(--c-accent);
  vertical-align: middle;
}

/* table of contents */
.toc { margin-top: 3rem; }
.toc-label {
  margin: 0 0 1rem;
  color: var(--ink-dim);
  letter-spacing: 0.16em;
}
.toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.toc li { border-top: 1px solid var(--line); }
.toc a {
  display: block;
  padding-block: 0.7rem;
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}
.toc a:hover { color: var(--ink); padding-left: 0.4rem; }
.toc .toc-l3 a { padding-left: 1.25rem; font-size: 0.875rem; }
.toc .toc-l3 a:hover { padding-left: 1.65rem; }
.toc .toc-l4 a { padding-left: 2.25rem; font-size: 0.875rem; }

/* ------------------------------------------------------------- disclaimer -- */

.disclaimer {
  margin: 0 0 3rem;
  padding: 1.75rem 2rem;
  background: var(--surface);
  border-left: 3px solid var(--c-accent);
}
.disclaimer-label {
  margin: 0 0 0.6rem;
  color: var(--ink);
  letter-spacing: 0.16em;
}
.disclaimer-label::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 0.55rem;
  border-radius: 50%;
  background: var(--c-accent);
  vertical-align: middle;
}
.disclaimer-text > :first-child { margin-top: 0; }
.disclaimer-text > :last-child { margin-bottom: 0; }
.disclaimer-text { font-size: 1rem; line-height: 1.6; color: var(--ink-dim); }
.disclaimer-text strong { color: var(--ink); }

/* ----------------------------------------------------------------- prose -- */

.prose { font-size: 1.25rem; line-height: 1.65; max-width: 78ch; }
.prose-narrow { max-width: 68ch; }

.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 1.3em; }

.prose h2 {
  font-size: 2.625rem;
  line-height: 1.22;
  margin: 2.2em 0 0.5em;
}
.prose h3 {
  font-size: 2.1875rem;
  line-height: 1.22;
  margin: 1.8em 0 0.5em;
}
.prose h4 { font-size: 1.4rem; margin: 1.6em 0 0.5em; }
.prose h2:first-child, .prose h3:first-child { margin-top: 0; }

.prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--c-accent);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
  transition: color 0.25s var(--ease);
}
.prose a:hover {
  color: var(--ink);
  text-decoration-thickness: 2px;
  background: var(--surface);
}

.prose ul, .prose ol { margin: 0 0 1.3em; padding-left: 1.4em; }
.prose li { margin-bottom: 0.55em; padding-left: 0.25em; }
.prose li::marker { color: var(--c-accent); font-family: var(--mono); font-size: 0.85em; }
.prose ul.checklist { list-style: none; padding-left: 0; }
.prose ul.checklist li {
  position: relative;
  padding-left: 2rem;
}
.prose ul.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 11px;
  height: 6px;
  border-left: 1.5px solid var(--c-accent);
  border-bottom: 1.5px solid var(--c-accent);
  transform: rotate(-45deg);
}

/* quotes — inverted slab, straight from the reference design */
.prose blockquote {
  margin: 44px 0;
  padding: 40px;
  border: 0;
  background: var(--ink);
  color: var(--bg);
  font-size: 1.25rem;
  line-height: 1.35;
}
.prose blockquote p { margin: 0; }
.prose blockquote p + p { margin-top: 1em; }
.prose blockquote cite {
  display: block;
  margin-top: 1.25rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-style: normal;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.7;
}

/* tables — scroll inside their own box, never the page */
.prose table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 2em 0;
  font-size: 0.95rem;
  line-height: 1.5;
}
.prose th, .prose td {
  padding: 0.85rem 1.1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.prose th {
  font-family: var(--mono);
  font-weight: 400;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  white-space: nowrap;
  border-bottom-color: var(--line-strong);
}
.prose tbody tr:hover { background: var(--surface); }
.prose caption {
  caption-side: bottom;
  padding-top: 0.75rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-dim);
  text-align: left;
}

/* code */
.prose code, .prose kbd, .prose samp {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--surface-2);
  color: var(--ink);
  padding: 0.14em 0.42em;
  border-radius: 3px;
}
.prose pre {
  margin: 2em 0;
  padding: 1.5rem;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 0.95rem;
  line-height: 1.6;
}
.prose pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: 0.85rem;
}

/* figures */
.prose figure { margin: 2.5em 0; }
.prose figure img { width: 100%; }
.prose figcaption, figcaption {
  margin-top: 0.9rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--ink-dim);
}

.prose hr {
  margin: 3em 0;
  border: 0;
  border-top: 1px solid var(--line);
}

/* --------------------------------------------- takeaways, facts, figures -- */

.key-takeaways {
  margin: 0 0 2.5em;
  padding: 2rem 2.25rem;
  background: var(--surface);
  border-top: 2px solid var(--c-accent);
  font-size: 1.05rem;
  line-height: 1.6;
}
.key-takeaways > :first-child { margin-top: 0; }
.key-takeaways > :last-child { margin-bottom: 0; }
.key-takeaways h2,
.key-takeaways h3,
.key-takeaways p.title {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 0 0 1.25rem;
}
.key-takeaways ul, .key-takeaways ol { margin: 0; padding-left: 1.25em; }
.key-takeaways li { margin-bottom: 0.7em; }

.key-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1px;
  margin: 2.5em 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}
.key-facts > * {
  margin: 0;
  padding: 1.5rem;
  background: var(--bg);
}
.key-facts dt, .key-facts .k {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 0.5rem;
}
.key-facts dd, .key-facts .v {
  margin: 0;
  font-size: 1.6rem;
  line-height: 1.2;
}

/* an individual number sourced from the reference database */
.fact {
  font-family: var(--mono);
  font-size: 0.92em;
  white-space: nowrap;
  padding: 0.05em 0.1em;
  border-bottom: 1px dashed var(--c-accent);
}
.fact a {
  color: var(--ink);
  text-decoration: none;
}
.fact:hover { border-bottom-style: solid; border-bottom-width: 2px; }
.fact a:hover { color: var(--ink); }

/* ----------------------------------------------------------------- faq -- */

.block-h {
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 0 0 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line-strong);
}

.faq { margin-top: 4.5rem; max-width: 78ch; }
.faq dl { margin: 0; }
.faq dt {
  font-size: 1.25rem;
  font-weight: 500;
  line-height: 1.35;
  margin-top: 1.75rem;
}
.faq dd {
  margin: 0.6rem 0 0;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 1.05rem;
  line-height: 1.6;
}
.faq dd p { margin: 0 0 0.8em; }
.faq dd p:last-child { margin-bottom: 0; }

/* --------------------------------------------------------------- sources -- */

.sources { margin-top: 4.5rem; max-width: 78ch; }
.sources ol { list-style: none; margin: 0; padding: 0; }
.sources .src {
  display: grid;
  grid-template-columns: 3ch 1fr;
  gap: 1rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 110px;
}
.sources .src:target {
  background: var(--surface);
  box-shadow: -1rem 0 0 var(--surface), 1rem 0 0 var(--surface);
  border-left: 2px solid var(--c-accent);
  padding-left: 0.6rem;
  margin-left: -0.6rem;
}
.src-n { color: var(--ink-dim); font-size: 0.8rem; padding-top: 0.25rem; }
.src-main { display: block; }
.sources a {
  color: var(--ink);
  font-size: 1.05rem;
  line-height: 1.45;
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.2em;
}
.sources a:hover { text-decoration-color: var(--c-accent); }
.src-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.55rem;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
}
.src-kind, .src-checked, .src-warn {
  display: inline-block;
  padding: 0.2em 0.6em;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--ink-dim);
}
.src-official .src-kind { color: var(--ink); border-color: var(--ink); }
.src-warn {
  color: var(--bg);
  background: var(--ink);
  border-color: var(--ink);
}
.src-warn::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: var(--c-accent);
  vertical-align: middle;
}
.src-aggregator .src-main > a { text-decoration-style: dashed; }

/* --------------------------------------------------------------- byline -- */

.byline {
  margin-top: 4.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line-strong);
  max-width: 78ch;
}
.byline-label {
  margin: 0 0 0.75rem;
  color: var(--ink-dim);
  letter-spacing: 0.16em;
}
.byline-name { margin: 0; font-size: 1.2rem; font-weight: 500; }
.byline-bio {
  margin: 0.4rem 0 0;
  color: var(--ink-dim);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 52ch;
}

/* --------------------------------------------------------------- footer -- */

.site-foot {
  border-top: 1px solid var(--line);
  padding-block: var(--band) 3rem;
  margin-top: var(--band);
}
.foot-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2.5rem;
  flex-wrap: wrap;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--line);
}
.foot-tag {
  margin: 0;
  max-width: 34ch;
  font-size: 1.5rem;
  line-height: 1.3;
}
.foot-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.foot-nav a {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  text-decoration: none;
}
.foot-nav a:hover { color: var(--ink); text-decoration: underline; }
.foot-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  margin: 2rem 0 0;
  font-size: 0.72rem;
  color: var(--ink-dim);
}
.foot-legal .mono { font-size: 0.72rem; }

/* ======================================================== responsive ===== */

@media (max-width: 1200px) {
  :root { --colgap: 72px; }
  .doc-title { font-size: 5rem; }
}

/* tablet — the grid collapses to a single centred column */
@media (max-width: 991px) {
  :root { --gap: 64px; }

  .headrow {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
  }
  .headrow-t { font-size: 3rem; }
  .band-note { margin-inline: auto; text-align: center; }

  .grid {
    grid-template-columns: 1fr;
    max-width: 520px;
    margin-inline: auto;
    width: 100%;
  }
  .card-title { font-size: 1.6rem; }

  .hub-link {
    grid-template-columns: 1fr auto;
    gap: 0.4rem 1rem;
  }
  .hub-s { grid-column: 1 / -1; }
  .hub-link .arrow { display: none; }

  .intro { padding-block: 128px 40px; }
  .intro-t { font-size: 3.25rem; }

  .doc-hero { padding-block: 128px 40px; }
  .doc-title { font-size: 4rem; }
  .doc-title-sm { font-size: 3.25rem; }
  .doc-lead { font-size: 1.3rem; }

  .doc-cols { grid-template-columns: 1fr; row-gap: 80px; }
  .doc-meta { position: static; }

  .prose { max-width: none; }
  .prose h2 { font-size: 2.5rem; }
  .prose h3 { font-size: 2rem; }
}

@media (max-width: 767px) {
  :root { --band: 64px; --gap: 48px; }
  .headrow-t { font-size: 2.5rem; }
  .doc-cols { row-gap: 64px; }
  .doc-hero { padding-block: 112px 36px; }
  .intro { padding-block: 112px 36px; }
  .site-head-in { min-height: 64px; }
}

/* mobile portrait — verified at 360px */
@media (max-width: 479px) {
  :root { --gutter: 16px; --band: 40px; --gap: 40px; }

  body { font-size: 18px; }

  .site-head-in { gap: 0.75rem 1rem; padding-block: 0.6rem; }
  .brand-name { font-size: 0.75rem; letter-spacing: 0.1em; }
  .site-nav ul { gap: 0.25rem 1.1rem; }
  .site-nav a { font-size: 0.7rem; letter-spacing: 0.06em; }

  .crumbs { padding-top: 1.5rem; }
  .crumbs ol { font-size: 0.68rem; gap: 0.15rem 0.5rem; }
  .crumbs li + li::before { margin-right: 0.5rem; }

  .intro { padding-block: 92px 32px; }
  .intro-t { font-size: 2.375rem; line-height: 1.15; }
  .intro-lead { font-size: 1.1rem; }

  .headrow { margin-bottom: 40px; }
  .headrow-t { font-size: 2.375rem; }
  .band-note { margin-top: -24px; margin-bottom: 40px; font-size: 1rem; }

  .pill { height: 48px; padding: 4px 20px; font-size: 0.85rem; gap: 0.6rem; }
  .pill .arrow { width: 32px; }

  .grid { max-width: none; }
  .card-body { padding: 24px 24px 88px; gap: 20px; }
  .card-title { font-size: 1.4rem; }
  .card-arrow { bottom: 24px; left: 24px; }

  .hub-link { padding-block: 1.25rem; }
  .hub-t { font-size: 1.15rem; }

  .doc-hero { padding-block: 92px 32px; }
  .doc-title { font-size: 2.6rem; line-height: 1.16; }
  .doc-title-sm { font-size: 2.375rem; }
  .doc-lead { font-size: 1.15rem; margin-top: 1.25rem; }

  .doc-body { padding-block: 48px 60px; }
  .doc-cols { row-gap: 44px; }

  .meta-row { padding-block: 20px; flex-wrap: wrap; }
  .meta-row dt { font-size: 0.68rem; }
  .meta-row dd { text-align: left; }

  .disclaimer { padding: 1.25rem 1.25rem; margin-bottom: 2rem; }

  .prose { font-size: 1.05rem; }
  .prose h2 { font-size: 2.125rem; }
  .prose h3 { font-size: 1.75rem; }
  .prose blockquote { margin: 40px 0; padding: 26px; font-size: 1.05rem; }
  .prose pre { padding: 1rem; }

  .key-takeaways { padding: 1.5rem 1.25rem; }
  .key-facts { grid-template-columns: 1fr; }

  .sources .src { grid-template-columns: 2.5ch 1fr; gap: 0.6rem; }
  .sources a { font-size: 0.95rem; }

  .foot-tag { font-size: 1.2rem; }
  .site-foot { padding-block: 48px 2rem; }
  .foot-top { padding-bottom: 2rem; gap: 1.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-head, .site-foot, .related, .toc, .card-arrow { display: none; }
  body { background: #fff; color: #000; font-size: 12pt; }
  .doc-cols { display: block; }
}