/* ============================================================
   009 blog — shared styles for the index and the articles
   ============================================================ */
:root {
  --paper: #f6f6f2;
  --card-ink: #050505;      /* the dark tile keeps its own pair in both themes */
  --ink: #050505;
  --muted: #6f6f6a;
  --faint: #6f6f6a;          /* spec #a5a59e is 2.3:1 on paper — unreadable */
  --faint-dark: #a5a59e;     /* on ink tiles it clears AA, so it stays */
  --muted-on-tile: #636359;  /* the tile is darker than paper */
  --hairline: #e4e3dc;
  --tile: #ecebe4;
  --hover: #efeee8;
  --sans: "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--sans); -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.wrap { max-width: 1200px; margin: 0 auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- header / footer ---------- */
.site-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 24px 40px; border-bottom: 1px solid var(--hairline);
}
.logo { font: 600 14px var(--mono); letter-spacing: 0.35em; }
.site-nav { display: flex; gap: 28px; align-items: center; font: 500 12px var(--mono); }
.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] { color: var(--ink); border-bottom: 1px solid var(--ink); padding-bottom: 2px; }
.btn-audit {
  background: var(--ink); color: var(--paper) !important;
  padding: 10px 18px; border-radius: 2px; transition: opacity 0.18s ease;
}
.btn-audit:hover { opacity: 0.85; }
.site-footer {
  display: grid;
  grid-template-columns: minmax(0, 2fr) 1fr 1fr auto;
  gap: 34px clamp(24px, 4vw, 64px);
  margin: 0 40px; padding: 44px 0 34px;
  border-top: 1px solid var(--hairline);
  color: var(--muted);
}
.site-footer a {
  font: 500 12px var(--mono); color: var(--ink);
  border-bottom: 1px solid var(--ink); padding-bottom: 2px; white-space: nowrap;
}

/* ---------- index: title + filters ---------- */
.page-title { margin: 0; padding: 52px 40px 0; font: 600 46px/1.05 var(--sans); letter-spacing: -0.02em; }
.page-dek { margin: 14px 0 0; padding: 0 40px; max-width: 58ch; font: 400 14px/1.55 var(--sans); color: var(--muted); }
.filters { display: flex; flex-wrap: wrap; gap: 10px; padding: 26px 40px 30px; }
.filter {
  display: flex; gap: 10px; align-items: baseline; padding: 13px 22px;
  border: 1px solid var(--ink); border-radius: 2px;
  font: 500 13px var(--mono); color: var(--ink); background: none; cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}
.filter .count { color: var(--faint); }
.filter:hover { background: var(--hover); }
.filter[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.filter[aria-pressed="true"] .count { color: var(--faint-dark); }
.filter[aria-pressed="true"]:hover { background: var(--ink); opacity: 0.85; }

/* ---------- index: grid ---------- */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; padding: 0 40px 44px; margin: 0; }
.post { display: flex; flex-direction: column; gap: 14px; transition: transform 0.15s ease; }
.post:hover, .post:focus-visible { transform: translateY(-3px); }
.post--featured { grid-column: span 2; }
.post-title { font: 600 20px/1.25 var(--sans); text-wrap: pretty; }
.post--featured .post-title { font: 600 26px/1.2 var(--sans); letter-spacing: -0.015em; }
.post-dek { margin: 6px 0 0; font: 400 13px/1.5 var(--sans); color: var(--muted); }
.post--featured .post-dek { margin-top: 8px; font-size: 14px; max-width: 640px; }
.post-meta {
  margin-top: 8px; display: flex; justify-content: space-between; align-items: baseline;
  font: 500 11px var(--mono);
}
.post--featured .post-meta { margin-top: 10px; }
.post-meta .date { color: var(--faint); }
.post-meta .read { color: var(--ink); }

/* ---------- covers: typographic, no images ---------- */
.cover {
  height: 240px; padding: 24px; border-radius: 2px; background: var(--tile);
  display: flex; flex-direction: column; justify-content: space-between;
}
.post--featured .cover, .post--tall .cover { height: 320px; }
.post--featured .cover { padding: 26px; }
/* the ink tile is artwork: its colours are constants, not theme surfaces —
   otherwise dark mode turns its type near-black on black */
.cover--dark { background: var(--card-ink, #050505); color: #f6f6f2; }
.cover-top { display: flex; justify-content: space-between; align-items: center; font: 500 11px var(--mono); color: var(--muted-on-tile); }
.cover--dark .cover-top { color: #a5a59e; }
.cover-top .kicker-group { display: flex; gap: 10px; align-items: center; }
.cover-caption { font: 400 12px var(--mono); color: var(--muted-on-tile); }
.cover--dark .cover-caption { color: #a5a59e; }
.stat-xl { font: 700 140px/1 var(--sans); letter-spacing: -0.05em; }
.stat-lg { font: 700 84px/1 var(--sans); letter-spacing: -0.04em; }
.stat-md { font: 700 72px/1 var(--sans); letter-spacing: -0.04em; }
.stat-md .arrow, .stat-lg .unit { color: var(--faint); }
.cover--dark .stat-lg .unit, .cover--dark .stat-md .arrow { color: #a5a59e; }
.cover-quote { font: 600 26px/1.35 var(--sans); letter-spacing: -0.01em; }
.cover-redact { font: 500 20px/1.9 var(--mono); color: var(--ink); }
.cover-redact .reveal { background: var(--ink); color: var(--paper); padding: 2px 8px; }
.cover-term { font: 500 13px/1.8 var(--mono); color: var(--ink); }

/* ---------- chips: case filled · research outline · guide dashed ---------- */
.chip { font: 600 10.5px var(--mono); border-radius: 2px; text-transform: lowercase; }
.chip--case { background: var(--ink); color: var(--paper); padding: 3px 9px; }
.chip--research { border: 1px solid var(--ink); color: var(--ink); padding: 2px 8px; }
.chip--guide { border: 1px dashed var(--muted); color: var(--ink); padding: 2px 8px; }
.cover--dark .chip--case { background: #f6f6f2; color: #050505; }
.cover--dark .chip--research, .cover--dark .chip--guide { border-color: rgba(246, 246, 242, 0.5); color: #f6f6f2; }

/* ============================================================
   article
   ============================================================ */
.article { max-width: 1200px; margin: 0 auto; }
.article-head { padding: 52px 40px 0; }
.article-kicker { display: flex; gap: 10px; align-items: center; font: 500 11px var(--mono); color: var(--muted); }
.article-title {
  margin: 18px 0 0; max-width: 20ch;
  font: 600 46px/1.05 var(--sans); letter-spacing: -0.02em; text-wrap: pretty;
}
.article-dek { margin: 16px 0 0; max-width: 62ch; font: 400 17px/1.5 var(--sans); color: var(--muted); }
.article-meta {
  margin: 22px 0 0; padding-top: 16px; border-top: 1px solid var(--hairline);
  display: flex; flex-wrap: wrap; gap: 8px 24px; font: 500 11px var(--mono); color: var(--faint);
}
.article-cover { margin: 28px 40px 0; }
.article-cover .cover { height: 260px; }

.article-body { padding: 40px 40px 12px; max-width: 760px; }
.article-body > * + * { margin-top: 20px; }
.article-body h2 {
  margin-top: 48px; font: 600 26px/1.2 var(--sans); letter-spacing: -0.015em; text-wrap: pretty;
}
.article-body h3 { margin-top: 34px; font: 600 18px/1.3 var(--sans); }
.article-body p { margin: 0; font: 400 17px/1.62 var(--sans); color: #242420; }
.article-body strong { font-weight: 600; color: var(--ink); }
.article-body ul { margin: 0; padding-left: 20px; }
.article-body li { font: 400 17px/1.62 var(--sans); color: #242420; margin-top: 6px; }
.article-body .lede { font-size: 19px; color: var(--ink); }
.article-note {
  padding: 18px 20px; background: var(--tile); border-radius: 2px;
  font: 400 13px/1.6 var(--mono); color: var(--muted-on-tile);
}
.article-note b { color: var(--ink); font-weight: 600; }

.data { width: 100%; border-collapse: collapse; margin-top: 8px; }
.data caption {
  text-align: left; padding-bottom: 10px;
  font: 500 11px var(--mono); color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase;
}
.data th, .data td {
  padding: 12px 16px 12px 0; text-align: left; vertical-align: top;
  border-bottom: 1px solid var(--hairline); font: 400 14px/1.45 var(--sans); color: #242420;
}
.data thead th {
  padding-bottom: 9px; border-bottom: 1px solid var(--ink);
  font: 500 11px var(--mono); color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase;
}
.data tbody th { font-weight: 600; color: var(--ink); }
.data .num { font: 600 14px var(--mono); white-space: nowrap; }

.article-end {
  margin: 44px 40px 0; padding: 26px 0 0; border-top: 1px solid var(--ink);
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 30px; align-items: baseline;
}
.article-end p { margin: 0; max-width: 46ch; font: 400 14px/1.5 var(--sans); color: var(--muted); }
.article-end .actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.article-end .ghost {
  font: 500 12px var(--mono); color: var(--ink);
  border-bottom: 1px solid var(--ink); padding-bottom: 2px;
}

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .post--featured { grid-column: span 2; }
}
@media (max-width: 680px) {
  .site-header { padding: 20px 24px; gap: 16px; flex-wrap: wrap; }
  .page-title { padding: 40px 24px 0; font-size: 36px; }
  .page-dek { padding: 0 24px; }
  .filters { flex-wrap: wrap; padding: 20px 24px 26px; }
  .grid { grid-template-columns: 1fr; padding: 0 24px 32px; }
  .post--featured { grid-column: span 1; }
  .post--featured .cover, .post--tall .cover { height: 260px; }
  .stat-xl { font-size: 92px; }
  .site-footer { margin: 0 24px; flex-direction: column; align-items: flex-start; }
  .article-head { padding: 40px 24px 0; }
  .article-title { font-size: 32px; max-width: none; }
  .article-dek { font-size: 16px; }
  .article-cover { margin: 24px 24px 0; }
  .article-body { padding: 32px 24px 12px; }
  .article-body h2 { font-size: 22px; margin-top: 40px; }
  .article-body p, .article-body li { font-size: 16px; }
  .article-end { margin: 36px 24px 0; }
  .data th, .data td { font-size: 13px; padding-right: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  .post, .btn-audit, .filter { transition: none; }
  .post:hover, .post:focus-visible { transform: none; }
}


/* ============================================================
   fixed site header (same bar as the homepage)
   ============================================================ */
.site-head {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 96;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  height: 58px;
  padding: 0 clamp(16px, 4vw, 40px);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--hairline);
}
.head-logo {
  font: 600 14px var(--mono); letter-spacing: 0.35em;
  color: var(--ink-strong, #050505); text-decoration: none;
}
.head-nav { display: flex; align-items: center; gap: 26px; }
.head-nav a {
  font: 500 12px var(--mono); color: var(--muted); text-decoration: none;
  transition: color 0.18s ease;
}
.head-nav a:hover { color: var(--ink-strong, #050505); }
.head-nav a[aria-current="page"] {
  color: var(--ink-strong, #050505);
  border-bottom: 1px solid currentColor; padding-bottom: 2px;
}
.head-nav .head-cta {
  padding: 9px 16px; border-radius: 999px;
  background: var(--ink-strong, #050505); color: var(--paper);
  font-weight: 700; letter-spacing: 0.02em; border-bottom: 0 !important;
  transition: opacity 0.18s ease;
}
.head-nav .head-cta:hover { opacity: 0.85; color: var(--paper); }
.wrap { padding-top: 58px; }

/* ---------- coming soon ---------- */
.filter.is-soon { border-style: dashed; }
.filter.is-soon .count { letter-spacing: 0.04em; }
.soon-note {
  margin: -12px 0 0; padding: 0 40px 22px;
  font: 400 13px/1.5 var(--mono); color: var(--muted);
}
.post--soon { cursor: default; }
.post--soon:hover { transform: none; }
.post--soon .cover-redact { color: var(--muted); opacity: 0.5; }
.post--soon .post-title, .post--soon .post-dek { opacity: 0.55; }

/* ---------- theme toggle (shared mechanism with /guide) ---------- */
.themetoggle {
  position: fixed; right: 20px; bottom: 20px; z-index: 80;
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--paper); color: var(--ink-strong, #050505);
  border: 1px solid var(--hairline); cursor: pointer;
  transition: border-color 0.18s ease;
}
.themetoggle:hover { border-color: var(--ink-strong, #050505); }
.themetoggle svg { width: 17px; height: 17px; }
.themetoggle .sun { display: none; }
[data-theme="dark"] .themetoggle .sun { display: block; }
[data-theme="dark"] .themetoggle .moon { display: none; }

/* ---------- dark theme ---------- */
[data-theme="dark"] {
  --paper: #0a0a0a;
  --ink: #ededed;
  --ink-strong: #ededed;
  --muted: #9a9a9a;
  --faint: #9a9a9a;
  --muted-on-tile: #9a9a9a;
  --hairline: #1f1f1f;
  --tile: #141414;
  --hover: #161616;
}
[data-theme="dark"] body { background: var(--paper); color: var(--ink); }
[data-theme="dark"] .post-title,
[data-theme="dark"] .page-title,
[data-theme="dark"] .article-title,
[data-theme="dark"] .article-body h2,
[data-theme="dark"] .article-body h3,
[data-theme="dark"] .post-meta .read { color: var(--ink); }
[data-theme="dark"] .article-body p, [data-theme="dark"] .article-body li { color: #c9c9c4; }
[data-theme="dark"] .filter { border-color: var(--ink); color: var(--ink); }
[data-theme="dark"] .filter[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
[data-theme="dark"] .chip--research { border-color: var(--ink); color: var(--ink); }
[data-theme="dark"] .chip--guide { border-color: var(--muted); color: var(--ink); }
[data-theme="dark"] .chip--case { background: var(--ink); color: var(--paper); }
/* the ink tile stays ink in both themes — it is the artwork, not the surface */
[data-theme="dark"] .site-footer { border-top-color: var(--ink); }
[data-theme="dark"] .site-footer a { color: var(--ink); border-bottom-color: var(--ink); }
[data-theme="dark"] .data thead th { border-bottom-color: var(--ink); }
[data-theme="dark"] .data tbody th { color: var(--ink); }
[data-theme="dark"] .data td { color: #c9c9c4; }
[data-theme="dark"] .article-note { background: var(--tile); color: var(--muted); }
[data-theme="dark"] .article-note b { color: var(--ink); }
[data-theme="dark"] .article-end { border-top-color: var(--ink); }
[data-theme="dark"] .article-end .ghost { color: var(--ink); border-bottom-color: var(--ink); }
[data-theme="dark"] .cover-redact { color: var(--ink); }
[data-theme="dark"] .cover-redact .reveal { background: var(--ink); color: var(--paper); }
[data-theme="dark"] .cover-term { color: var(--ink); }
[data-theme="dark"] .btn-audit { background: var(--ink); color: var(--paper) !important; }

@media (max-width: 680px) {
  .head-nav { gap: 16px; }
  .head-nav a:not(.head-cta) { display: none; }
  .soon-note { padding: 0 24px 20px; }
}

/* ---------- person card · used on /about/ ---------- */
.person { display: flex; gap: 16px; align-items: center; margin: 0; }
.person img {
  width: 64px; height: 64px; border-radius: 50%; object-fit: cover;
  flex: none; border: 1px solid var(--hairline);
}
.person .who { font: 700 17px/1.3 var(--sans); color: var(--ink); }
.person .role { margin-top: 3px; font: 500 13px var(--mono); color: var(--muted); }
.person .links { margin-top: 6px; font: 500 12px var(--mono); }
.person .links a { color: var(--muted); border-bottom: 1px solid var(--hairline); }
.person .links a:hover { color: var(--ink); border-color: var(--ink); }
.person .links a + a { margin-left: 14px; }

/* legal pages run long — the meta line keeps the effective date in sight */
.legal-note {
  margin-top: 28px; padding: 16px 18px; border: 1px solid var(--hairline);
  border-radius: 12px; font: 500 14px/1.6 var(--sans); color: var(--muted);
}

/* ---------- light pane · the blocks moved off the homepage keep their own surface ---------- */
:root { --pane: #ffffff; }
[data-theme="dark"] { --pane: #141414; }

.pane {
  /* it sits outside .article-body, so it has to reproduce that column itself —
     left full-width it stretched to 1200px under 760px of text */
  margin: 38px 40px 0; max-width: 760px;
  padding: clamp(22px, 3vw, 34px);
  background: var(--pane); border: 1px solid var(--hairline); border-radius: 18px;
}
@media (max-width: 760px) { .pane { margin: 30px 24px 0; } }
.pane > h2:first-child { margin-top: 0; }
.pane-eyebrow {
  display: block; margin-bottom: 10px;
  font: 500 12px var(--mono); letter-spacing: 0.02em; color: var(--muted);
}
.faq-list { margin-top: 20px; border-top: 1px solid var(--hairline); }
.qa { border-bottom: 1px solid var(--hairline); }
.qa summary {
  position: relative; list-style: none; cursor: pointer;
  padding: 16px 38px 16px 0; font: 700 16px/1.35 var(--sans);
  letter-spacing: -0.01em; color: var(--ink);
}
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after {
  content: "+"; position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  font: 500 17px var(--mono); color: var(--muted);
}
.qa[open] summary::after { content: "−"; }
.qa summary:hover { opacity: 0.72; }
.qa p { margin: 0; padding: 0 0 18px; font: 400 16px/1.6 var(--sans); color: #242420; }
[data-theme="dark"] .qa p { color: #c9c9c4; }
@media (max-width: 640px) {
  .pane { padding: 20px 16px; }
  .qa summary { font-size: 15px; padding-right: 32px; }
}

/* the legal pages have to be reachable from every page, footer included */
.site-footer-legal { font: 500 12px var(--mono); color: var(--muted); }
.site-footer-legal a { color: var(--muted); border-bottom: 1px solid var(--hairline); }
.site-footer-legal a:hover { color: var(--ink); border-color: var(--ink); }
@media (max-width: 640px) { .site-footer-legal { order: 3; width: 100%; } }

/* ---------- footer ---------- */
.foot-brand { max-width: 42ch; }
.foot-mark { display: block; font: 800 15px var(--mono); letter-spacing: 0.04em; color: var(--ink); }
.foot-line { margin: 10px 0 0; font: 400 13px/1.6 var(--sans); color: var(--muted); }
.foot-mail { display: inline-block; margin-top: 12px; font: 500 12px var(--mono); color: var(--ink); border-bottom: 1px solid var(--hairline); padding-bottom: 1px; }
.foot-mail:hover { border-color: var(--ink); }
.foot-col { display: flex; flex-direction: column; gap: 9px; align-items: flex-start; }
.foot-h {
  font: 500 10px var(--mono); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 2px;
}
.foot-col a { font: 500 13px var(--sans); color: var(--muted); border-bottom: 0; }
.foot-col a:hover { color: var(--ink); }
.foot-cta { display: flex; align-items: flex-start; justify-content: flex-end; }
.foot-base {
  grid-column: 1 / -1; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  margin: 0; padding-top: 26px; border-top: 1px solid var(--hairline);
  font: 400 11px var(--mono); color: var(--faint);
}
.foot-engines { letter-spacing: 0.02em; }
@media (max-width: 900px) {
  .site-footer { grid-template-columns: 1fr 1fr; margin: 0 24px; }
  .foot-brand { grid-column: 1 / -1; }
  .foot-cta { grid-column: 1 / -1; justify-content: flex-start; }
}
@media (max-width: 520px) {
  .site-footer { grid-template-columns: 1fr; gap: 26px; }
  .foot-base { flex-direction: column; gap: 8px; }
}

/* faq: slide the answer open (see styles.css for the reasoning) */
.qa { interpolate-size: allow-keywords; }
.qa::details-content {
  height: 0; overflow: hidden; opacity: 0;
  transition: height .3s cubic-bezier(.65,0,.35,1), opacity .24s cubic-bezier(.65,0,.35,1),
              content-visibility .3s allow-discrete;
}
.qa[open]::details-content { height: auto; opacity: 1; }
@media (prefers-reduced-motion: reduce) { .qa::details-content { transition: none; } }