/* ==========================================================================
   The public blog.

   Layout concept: one centred editorial column with an optional right rail.
   Hairline rules and generous space carry the hierarchy; the company's one
   brand colour does the rest, so any hex still looks composed.

   Colour and font tokens are written per company by app/core/theme.py. The
   sizes, spacing and shadows below are the same for everyone, which is what
   keeps a hundred different blogs looking deliberate.
   ========================================================================== */

:root {
  --radius: 14px;
  --radius-sm: calc(var(--radius) * 0.5);
  --radius-lg: calc(var(--radius) * 1.7);
  --radius-pill: 999px;
  --shadow-lift: 0 22px 44px -24px rgb(var(--rgb-text) / 0.3);

  --max-width: 1160px;
  --measure: 68ch;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 68px;

  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;

  --dur: 0.2s;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

html {
  font-size: var(--text-base, 17px);
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; border: 0; background: none; }
ul, ol { margin: 0; padding: 0; }

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

::selection { background: rgb(var(--rgb-primary) / 0.18); }

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

.csb-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.csb-skip {
  position: fixed;
  top: var(--s-2);
  left: var(--s-2);
  z-index: 200;
  padding: var(--s-2) var(--s-4);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 0.8125rem;
  font-weight: 600;
  transform: translateY(-250%);
  transition: transform var(--dur) var(--ease);
}
.csb-skip:focus { transform: translateY(0); }

/* ----------------------------------------------------------- shared bits -- */

.csb-eyebrow {
  font-size: 0.6875rem;
  font-weight: 650;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.csb-badge {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-tint);
  color: var(--color-accent-ink);
  font-size: 0.6563rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.csb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 0.875rem;
  font-weight: 600;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.csb-btn:hover { background: var(--color-primary-hover); }
.csb-btn:active { transform: translateY(1px); }
.csb-btn svg { width: 16px; height: 16px; }

.csb-btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.csb-btn--ghost:hover { background: var(--color-surface); }

.csb-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--s-3);
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}
.csb-meta .csb-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
}

.csb-avatar {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-primary-tint);
  color: var(--color-primary-ink);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.csb-avatar--lg { width: 56px; height: 56px; font-size: 0.9375rem; }

.csb-author-line { display: flex; align-items: center; gap: var(--s-3); min-width: 0; }
.csb-author-line strong { color: var(--color-text); font-weight: 600; font-size: 0.8125rem; }

/* Cover art. A post with no image of its own gets a generated one built from
   the company's brand colour, so the feed never shows a hole. */
.csb-cover {
  position: relative;
  aspect-ratio: 16 / 9;
  max-width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-surface-2);
  isolation: isolate;
}
.csb-cover img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.55s var(--ease);
}
.csb-cover::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 0 1px rgb(var(--rgb-text) / 0.07);
}
.csb-cover-link { display: block; }
.csb-cover-link:hover img { transform: scale(1.045); }

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

.csb-site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgb(var(--rgb-bg) / 0.86);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
.csb-site-header.csb-is-scrolled {
  border-bottom-color: var(--color-border);
  backdrop-filter: saturate(150%) blur(12px);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
}
.csb-header-inner {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  min-height: var(--header-h);
}
.csb-brand { display: flex; align-items: center; gap: 10px; margin-right: auto; min-width: 0; }
.csb-brand-name {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: -0.015em;
  line-height: 1.2;
}
.csb-brand-tag {
  display: block;
  font-size: 0.625rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-top: 2px;
}
.csb-brand img.csb-logo { height: 32px; width: auto; }

/* A dark logo disappears on a dark page, so a company may supply both and
   the right one is shown. With only one, it is always shown. */
.csb-logo--dark { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .csb-logo--light:not(:only-of-type) { display: none; }
  :root:not([data-theme="light"]) .csb-logo--dark { display: block; }
}
:root[data-theme="dark"] .csb-logo--light:not(:only-of-type) { display: none; }
:root[data-theme="dark"] .csb-logo--dark { display: block; }

.csb-icon-btn {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
.csb-icon-btn:hover { background: var(--color-surface); color: var(--color-text); }
.csb-icon-btn svg { width: 18px; height: 18px; }

/* Reading progress, on article pages only. */
.csb-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 150;
  height: 3px;
  pointer-events: none;
}
.csb-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 0.1s linear;
}

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

.csb-hero, .csb-article-head-wrap {
  background: linear-gradient(180deg, rgb(var(--rgb-primary) / 0.12) 0%,
                                      rgb(var(--rgb-primary) / 0.04) 45%,
                                      transparent 100%);
}
.csb-hero { padding-block: clamp(var(--s-6), 5vw, var(--s-8)) var(--s-7); }
.csb-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--s-5), 4vw, var(--s-7));
  align-items: center;
}
.csb-hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--s-4);
  min-width: 0;
}
.csb-hero-title {
  font-size: clamp(2.05rem, 1.1rem + 3.4vw, 3.4rem);
  line-height: 1.04;
  letter-spacing: -0.026em;
}
.csb-hero-excerpt { font-size: 1.0625rem; color: var(--color-muted); max-width: 46ch; }
.csb-hero .csb-cover { border-radius: var(--radius-lg); }
@media (min-width: 900px) {
  .csb-hero-grid { grid-template-columns: 1fr 1.05fr; }
  .csb-hero-copy { padding-right: var(--s-5); }
  .csb-hero-grid--solo { grid-template-columns: 1fr; }
  .csb-hero-grid--solo .csb-hero-copy { padding-right: 0; }
  .csb-hero-grid--solo .csb-hero-title { font-size: clamp(2.4rem, 1.4rem + 3.6vw, 3.9rem); max-width: 18ch; }
  .csb-hero-grid--solo .csb-hero-excerpt { max-width: 60ch; font-size: 1.125rem; }
}


/* A company's own stylesheet loads after this one, and ordinary class names
   collide: .csb-hero, .csb-container and .csb-card are used by half the web. CellSmash's
   site paints a decorative layer with .csb-hero:before, which landed on top of
   our hero and swallowed every click inside it.

   Anything a reader clicks is lifted above such a layer. This changes nothing
   visually; it only decides what receives the click. */
.csb-hero > .csb-container,
.csb-hero-grid,
.csb-hero-copy,
.csb-article-head-wrap > .csb-container,
.csb-filters-row,
.csb-layout,
.csb-card,
.csb-cover-link,
.csb-related,
.csb-pager,
.csb-site-header .csb-container,
.csb-site-footer .csb-container {
  position: relative;
  z-index: 1;
}
/* -------------------------------------------------------------- filters -- */

.csb-filters-row {
  display: flex;
  align-items: center;
  gap: var(--s-4);
  padding-block: var(--s-4);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.csb-filters {
  display: flex;
  gap: var(--s-2);
  overflow-x: auto;
  scrollbar-width: none;
  padding: 2px;
  margin: -2px;
}
.csb-filters::-webkit-scrollbar { display: none; }
.csb-pill {
  flex: 0 0 auto;
  padding: 7px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-size: 0.8125rem;
  font-weight: 550;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.csb-pill:hover { color: var(--color-text); border-color: rgb(var(--rgb-text) / 0.3); }
.csb-pill[aria-current="page"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-on-primary);
}
.csb-pill .csb-count { opacity: 0.6; margin-left: 6px; font-variant-numeric: tabular-nums; }
.csb-result-count { flex: 0 0 auto; font-size: 0.75rem; color: var(--color-muted); }
@media (max-width: 720px) { .csb-result-count { display: none; } }

/* ------------------------------------------------------- layout and feed -- */

.csb-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--s-6), 5vw, var(--s-8));
  padding-block: var(--s-7) var(--s-8);
  align-items: start;
}
@media (min-width: 1000px) {
  .csb-layout.csb-has-sidebar { grid-template-columns: minmax(0, 1fr) 300px; }
}
.csb-feed-col { min-width: 0; }
.csb-feed { display: grid; gap: clamp(var(--s-5), 3vw, var(--s-6)); }

.csb-feed--grid { grid-template-columns: 1fr; }
@media (min-width: 640px) { .csb-feed--grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1000px) { .csb-feed--grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

/* ---------------------------------------------------------------- cards -- */

.csb-card {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  min-width: 0;
  transition: transform 0.25s var(--ease);
}
.csb-card .csb-cover { margin-bottom: var(--s-1); }
.csb-card:hover { transform: translateY(-3px); }
.csb-card:hover .csb-cover { box-shadow: var(--shadow-lift); }
.csb-card:hover .csb-cover img { transform: scale(1.045); }
.csb-card-body {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  min-width: 0;
  flex: 1 1 auto;
}
.csb-card-title {
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.1875rem);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.csb-card:hover .csb-card-title { color: var(--color-primary-ink); }
.csb-card-excerpt {
  font-size: 0.875rem;
  color: var(--color-muted);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.csb-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-3);
  margin-top: auto;
  padding-top: var(--s-3);
}
.csb-feed--grid .csb-card--text,
.csb-magazine-rest .csb-card--text,
.csb-related-grid .csb-card--text {
  padding: var(--s-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.csb-feed--grid .csb-card--text:hover,
.csb-magazine-rest .csb-card--text:hover,
.csb-related-grid .csb-card--text:hover { border-color: rgb(var(--rgb-primary) / 0.45); }

.csb-card-foot { flex-wrap: wrap; row-gap: var(--s-2); }
.csb-card-foot .csb-meta { font-size: 0.75rem; flex-wrap: nowrap; white-space: nowrap; }
.csb-card-foot .csb-author-line strong { white-space: nowrap; }

/* List: a chronological reading list, cover beside the text. */
.csb-feed--list { grid-template-columns: 1fr; gap: 0; }
.csb-feed--list .csb-card {
  flex-direction: row;
  gap: var(--s-5);
  align-items: flex-start;
  padding-block: var(--s-6);
  border-bottom: 1px solid var(--color-border);
}
.csb-feed--list .csb-card:first-child { padding-top: 0; }
.csb-feed--list .csb-card:hover { transform: none; }
.csb-feed--list .csb-cover-link { flex: 0 0 clamp(140px, 28vw, 260px); }
.csb-feed--list .csb-card-title {
  font-size: clamp(1.1875rem, 1rem + 0.9vw, 1.5rem);
  -webkit-line-clamp: 3;
}
@media (max-width: 560px) {
  .csb-feed--list .csb-card { flex-direction: column; gap: var(--s-4); }
  .csb-feed--list .csb-cover-link { flex: 0 0 auto; width: 100%; }
}

/* Magazine: one lead story, two stacked beside it, then the regular grid. */
.csb-feed--magazine { grid-template-columns: 1fr; }
.csb-magazine-block { display: grid; grid-template-columns: 1fr; gap: clamp(var(--s-5), 3vw, var(--s-6)); }
@media (min-width: 860px) {
  .csb-magazine-block { grid-template-columns: 1.35fr 1fr; align-items: start; }
  .csb-magazine-stack { display: grid; gap: var(--s-6); }
  .csb-magazine-lead .csb-card-title {
    font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.15rem);
    -webkit-line-clamp: 3;
  }
  .csb-magazine-lead .csb-card-excerpt { font-size: 0.9375rem; -webkit-line-clamp: 4; }
  .csb-magazine-stack .csb-card { flex-direction: row; gap: var(--s-4); }
  .csb-magazine-stack .csb-cover-link { flex: 0 0 116px; }
  .csb-magazine-stack .csb-cover { margin-bottom: 0; }
  .csb-magazine-stack .csb-card-excerpt { display: none; }
  .csb-magazine-stack .csb-card-foot { padding-top: var(--s-1); }
}
.csb-magazine-rest {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--s-5), 3vw, var(--s-6));
  padding-top: clamp(var(--s-6), 4vw, var(--s-7));
  border-top: 1px solid var(--color-border);
}
@media (min-width: 640px) { .csb-magazine-rest { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1000px) { .csb-magazine-rest { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.csb-empty {
  display: grid;
  justify-items: center;
  gap: var(--s-4);
  padding: var(--s-9) var(--s-4);
  text-align: center;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.csb-empty h2 { font-size: 1.25rem; }
.csb-empty p { color: var(--color-muted); font-size: 0.9375rem; max-width: 40ch; }

.csb-pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding-top: var(--s-8);
}
.csb-pager .csb-page-of { font-size: 0.75rem; color: var(--color-muted); }

/* -------------------------------------------------------------- sidebar -- */

.csb-sidebar { display: grid; gap: var(--s-5); min-width: 0; }
@media (min-width: 1000px) {
  .csb-sidebar { position: sticky; top: calc(var(--header-h) + var(--s-5)); }
}
.csb-panel {
  padding: var(--s-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.csb-panel h2 {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--s-4);
}
.csb-panel p { font-size: 0.875rem; color: var(--color-muted); }
.csb-panel--about strong {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.125rem;
  color: var(--color-text);
  margin-bottom: var(--s-2);
}

.csb-recent { display: grid; gap: var(--s-4); list-style: none; }
.csb-recent li { display: flex; gap: var(--s-3); align-items: baseline; }
.csb-recent .csb-num {
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  color: rgb(var(--rgb-text) / 0.28);
  font-variant-numeric: tabular-nums;
  flex: 0 0 auto;
}
.csb-recent a {
  font-size: 0.875rem;
  font-weight: 550;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.csb-recent a:hover { color: var(--color-primary-ink); }
.csb-recent .csb-meta { font-size: 0.6875rem; margin-top: 2px; }

.csb-tags { display: flex; flex-wrap: wrap; gap: var(--s-2); list-style: none; }
.csb-tag {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  font-size: 0.75rem;
  color: var(--color-muted);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.csb-tag:hover {
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
  background: var(--color-primary-tint);
}

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

.csb-site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--s-8) var(--s-6);
}
.csb-footer-grid { display: grid; grid-template-columns: 1fr; gap: var(--s-7); }
@media (min-width: 720px) { .csb-footer-grid { grid-template-columns: 1.8fr 1fr 1fr; } }
.csb-footer-brand p {
  margin-top: var(--s-4);
  font-size: 0.875rem;
  color: var(--color-muted);
  max-width: 38ch;
}
.csb-footer-col h2 {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--s-4);
}
.csb-footer-col ul { display: grid; gap: var(--s-3); list-style: none; }
.csb-footer-col a { font-size: 0.875rem; color: var(--color-muted); }
.csb-footer-col a:hover { color: var(--color-text); }
.csb-footer-base {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  align-items: center;
  justify-content: space-between;
  margin-top: var(--s-8);
  padding-top: var(--s-5);
  border-top: 1px solid var(--color-border);
  font-size: 0.75rem;
  color: var(--color-muted);
}

/* ---------------------------------------------------------- article view -- */

.csb-article-head { padding-block: clamp(var(--s-6), 5vw, var(--s-8)) var(--s-6); }
.csb-back-btn {
  display: flex;
  width: fit-content;
  align-items: center;
  gap: var(--s-2);
  margin-bottom: var(--s-6);
  font-size: 0.8125rem;
  font-weight: 550;
  color: var(--color-muted);
  transition: color var(--dur) var(--ease), gap var(--dur) var(--ease);
}
.csb-back-btn:hover { color: var(--color-text); gap: var(--s-3); }
.csb-back-btn svg { width: 14px; height: 14px; }
.csb-article-title {
  font-size: clamp(2rem, 1.1rem + 3.4vw, 3.25rem);
  line-height: 1.05;
  letter-spacing: -0.028em;
  margin-block: var(--s-4) var(--s-5);
  max-width: 30ch;
}
.csb-article-standfirst {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-muted);
  max-width: 54ch;
}
.csb-article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  margin-top: var(--s-6);
  padding-top: var(--s-5);
  border-top: 1px solid var(--color-border);
}
.csb-article-cover { margin-bottom: clamp(var(--s-6), 4vw, var(--s-8)); }
.csb-article-cover .csb-cover { border-radius: var(--radius-lg); aspect-ratio: 21 / 9; }

.csb-article-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(var(--s-6), 4vw, var(--s-8));
  padding-bottom: var(--s-9);
}
@media (min-width: 1040px) {
  .csb-article-body.csb-has-contents { grid-template-columns: 220px minmax(0, 1fr); }
}

.csb-toc { min-width: 0; }
.csb-toc-inner { border-left: 1px solid var(--color-border); padding-left: var(--s-4); }
.csb-toc h2 {
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--s-3);
}
.csb-toc ol { display: grid; gap: var(--s-2); list-style: none; }
.csb-toc a { font-size: 0.8125rem; line-height: 1.45; color: var(--color-muted); }
.csb-toc a:hover { color: var(--color-text); }
.csb-toc a.csb-is-active { color: var(--color-primary-ink); font-weight: 600; }
.csb-toc li.csb-lvl-3 { padding-left: var(--s-4); }
.csb-toc summary {
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  padding: var(--s-3) 0;
  list-style: none;
}
.csb-toc summary::-webkit-details-marker { display: none; }
@media (min-width: 1040px) {
  .csb-toc-sticky { position: sticky; top: calc(var(--header-h) + var(--s-5)); }
  .csb-toc summary { display: none; }
}

/* Long-form typography. One measure, one rhythm. */
.csb-prose { min-width: 0; max-width: var(--measure); font-size: 1.0625rem; }
.csb-prose > * + * { margin-top: var(--s-5); }
.csb-prose h2 {
  color: var(--color-primary-on-bg);
  font-size: clamp(1.375rem, 1.1rem + 1.1vw, 1.75rem);
  margin-top: var(--s-8);
  scroll-margin-top: calc(var(--header-h) + var(--s-5));
}
.csb-prose h3 {
  color: var(--color-primary-on-bg);
  font-size: clamp(1.125rem, 1rem + 0.5vw, 1.3125rem);
  margin-top: var(--s-7);
  scroll-margin-top: calc(var(--header-h) + var(--s-5));
}
.csb-prose p { line-height: 1.75; }
.csb-prose a { color: var(--color-primary-on-bg); text-decoration: underline; text-underline-offset: 3px; }
.csb-prose strong { font-weight: 650; }
.csb-prose ul, .csb-prose ol { padding-left: 1.35em; display: grid; gap: var(--s-2); }
.csb-prose ul { list-style-type: disc; list-style-position: outside; }
.csb-prose ol { list-style-type: decimal; list-style-position: outside; }
.csb-prose li::marker { color: var(--color-muted); }
.csb-prose img { border-radius: var(--radius); margin-block: var(--s-6); }
.csb-prose blockquote {
  margin: var(--s-7) 0;
  padding-left: var(--s-5);
  border-left: 3px solid var(--color-primary);
  font-family: var(--font-heading);
  font-size: clamp(1.125rem, 1rem + 0.7vw, 1.375rem);
  line-height: 1.45;
}
.csb-prose pre {
  margin: var(--s-6) 0;
  padding: var(--s-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.6;
}
.csb-prose code {
  font-family: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
}
.csb-prose p > code, .csb-prose li > code {
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
}
.csb-prose pre code { background: none; padding: 0; }
.csb-prose hr { border: 0; border-top: 1px solid var(--color-border); margin: var(--s-8) 0; }

.csb-author-box {
  display: flex;
  gap: var(--s-4);
  align-items: flex-start;
  margin-top: var(--s-8);
  padding: var(--s-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.csb-author-box strong { display: block; font-family: var(--font-heading); font-size: 1.0625rem; }
.csb-author-box p { margin-top: var(--s-2); font-size: 0.875rem; color: var(--color-muted); }

.csb-share {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-3);
  margin-top: var(--s-6);
  padding-top: var(--s-5);
  border-top: 1px solid var(--color-border);
}
.csb-share > span {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.csb-share-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 550;
  color: var(--color-muted);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.csb-share-btn:hover { color: var(--color-text); border-color: rgb(var(--rgb-text) / 0.3); }
.csb-share-btn svg { width: 15px; height: 15px; }

.csb-related { padding-block: var(--s-8); border-top: 1px solid var(--color-border); }
.csb-related h2 { font-size: 1.375rem; margin-bottom: var(--s-6); color: var(--color-primary-on-bg); }
.csb-related-grid { display: grid; grid-template-columns: 1fr; gap: clamp(var(--s-5), 3vw, var(--s-6)); }
@media (min-width: 720px) { .csb-related-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

/* ---------------------------------------------------------------- toast -- */

.csb-toast {
  position: fixed;
  left: 50%;
  bottom: var(--s-6);
  transform: translateX(-50%);
  z-index: 180;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 0.8125rem;
  font-weight: 550;
  box-shadow: var(--shadow-lift);
}
.csb-toast[hidden] { display: none; }

/* ------------------------------------------------------------ notice ----- */

.csb-notice {
  display: grid;
  place-items: center;
  gap: var(--s-4);
  min-height: 60vh;
  text-align: center;
  padding: var(--s-8) var(--gutter);
}
.csb-notice h1 { font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.4rem); }
.csb-notice p { color: var(--color-muted); max-width: 44ch; }

@media (max-width: 860px) { :root { --header-h: 60px; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}


/* Inherited properties are the one thing a class prefix cannot protect us
   from. A customer stylesheet that sets `a { color: #1d1d1f }` loads after
   ours and reaches straight into the sidebar, where our panel is dark and the
   text then disappears. Anything of ours sitting on one of our own
   backgrounds states its own colour, which also outranks a bare element
   selector whatever the load order. */
.csb-panel { color: var(--color-text); }
.csb-panel a,
.csb-recent a { color: var(--color-text); }
.csb-panel p,
.csb-panel .csb-meta,
.csb-recent .csb-meta { color: var(--color-muted); }
.csb-sidebar { color: var(--color-text); }