/* ===========================================================
   Thesis A — Local styles
   Catalogue layout, section rhythm, atoms shared across A pages.
   =========================================================== */

/* ---- Constant brand presence in the shell bar ---- */
[data-thesis="a"] .shell-bar {
  box-shadow: inset 0 -2px 0 var(--color-accent);
  border-bottom: 0;
}

/* ---- Page container ---- */
.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}
.page--narrow { max-width: 760px; }
.page--wide   { max-width: 1440px; }

.page__head {
  margin-bottom: var(--space-10);
  padding-left: var(--space-4);
  border-left: 6px solid var(--color-accent);
}
.page__eyebrow {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 var(--space-3);
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 14px 6px 12px;
  background: color-mix(in srgb, var(--color-accent) 22%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-accent) 38%, transparent);
  border-radius: var(--radius-pill);
}
.page__eyebrow::before {
  content: ''; width: 8px; height: 8px; background: var(--color-accent);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--color-accent) 32%, transparent);
}
.page__title {
  font: var(--type-display-2xl);
  margin: var(--space-1) 0 var(--space-3);
  letter-spacing: -0.015em;
  line-height: 1;
}
.page__lede {
  font: var(--type-body);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-muted);
  margin: 0;
  max-width: 62ch;
}

.eyebrow {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: var(--ink-subtle);
}

/* ---- Catalogue layout — sticky TOC + scroll sections ---- */
.catalogue {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--space-12);
  align-items: start;
}
@media (max-width: 880px) {
  .catalogue { grid-template-columns: 1fr; gap: var(--space-6); }
  .catalogue__toc { position: relative !important; top: auto !important; padding: var(--space-4) 0; border-bottom: 1px solid var(--border); }
}

.catalogue__toc {
  position: sticky; top: 72px;
  font: var(--type-caption);
}
.catalogue__toc-title {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: var(--ink-subtle);
  margin: 0 0 var(--space-3);
}
.catalogue__toc-list { display: flex; flex-direction: column; }
.catalogue__toc-link {
  display: block;
  padding: var(--space-2) 0 var(--space-2) var(--space-3);
  color: var(--ink-muted);
  border-left: 2px solid var(--border);
  transition: color var(--motion-standard) var(--ease),
              border-color var(--motion-standard) var(--ease),
              padding-left var(--motion-standard) var(--ease);
}
.catalogue__toc-link:hover {
  color: var(--ink);
  border-left-color: var(--border-strong);
}
.catalogue__toc-link--active {
  color: var(--ink);
  font-weight: 500;
  border-left-color: var(--color-accent);
}

/* ---- Sections ---- */
.cat-section {
  scroll-margin-top: 72px;
  padding: var(--space-12) 0 var(--space-12);
  border-bottom: 1px solid var(--border);
}
.cat-section:first-child { padding-top: 0; }
.cat-section:last-child  { border-bottom: 0; }

.cat-section__head { margin-bottom: var(--space-8); }
.cat-section__eyebrow {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink);
  display: inline-flex; align-items: center; gap: 8px;
  margin-bottom: var(--space-3);
  padding: 4px 12px 4px 10px;
  background: color-mix(in srgb, var(--color-accent) 20%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-accent) 36%, transparent);
  border-radius: var(--radius-pill);
}
.cat-section__eyebrow::before {
  content: ''; width: 6px; height: 6px; background: var(--color-accent);
  border-radius: var(--radius-pill);
}
.cat-section__title { font: var(--type-display-md); margin: 0 0 var(--space-3); }
.cat-section__spec  { font: var(--type-body); color: var(--ink-muted); margin: 0; max-width: 60ch; }

.cat-sub {
  font: var(--type-heading-md);
  margin: var(--space-8) 0 var(--space-4);
  color: var(--ink);
  display: flex; align-items: baseline; gap: var(--space-3);
}
.cat-sub__hint {
  font: var(--type-caption);
  color: var(--ink-subtle);
  font-weight: 400;
}

/* ---- Display rows (label + content) ---- */
.cat-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--space-6);
  align-items: start;
  padding: var(--space-3) 0;
}
.cat-row__label {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: var(--ink-subtle);
  padding-top: 2px;
}
.cat-row__content { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }

/* ---- Swatch (color demo) ---- */
.swatch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-3);
}
.swatch {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface-raised);
  transition: border-color var(--motion-standard) var(--ease),
              transform var(--motion-standard) var(--ease);
}
.swatch:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}
.swatch__chip { height: 92px; }
.swatch__body { padding: var(--space-3); }
.swatch__name { font: var(--type-heading-sm); margin: 0 0 2px; }
.swatch__hex  { font: var(--type-mono); color: var(--ink-muted); }
.swatch__role { font: var(--type-caption); color: var(--ink-subtle); display: block; margin-top: 4px; }

/* ---- Type sample ---- */
.type-sample {
  padding: var(--space-3) 0;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-6);
  align-items: baseline;
  border-bottom: 1px dashed var(--border);
}
.type-sample:last-of-type { border-bottom: 0; }
.type-sample__meta {
  font: var(--type-mono);
  font-size: 11px;
  color: var(--ink-subtle);
  line-height: 1.4;
}
.type-sample__meta strong { color: var(--ink-muted); font-weight: 500; }
.type-sample__demo { color: var(--ink); }

/* ---- Spacing bars ---- */
.space-bars { display: flex; flex-direction: column; gap: var(--space-2); }
.space-bar {
  display: grid; grid-template-columns: 100px 1fr; gap: var(--space-4);
  align-items: center;
  font: var(--type-mono); font-size: 11px;
}
.space-bar__label { color: var(--ink-subtle); }
.space-bar__fill {
  height: 14px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  opacity: 0.85;
}

/* ---- Motion demo ---- */
.motion-demo {
  position: relative;
  height: 36px;
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
}
.motion-demo__dot {
  position: absolute; top: 50%; left: 6px;
  width: 24px; height: 24px;
  margin-top: -12px;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  transition: left var(--motion-panel) var(--ease);
}
.motion-demo:hover .motion-demo__dot { left: calc(100% - 30px); }
.motion-demo--micro    .motion-demo__dot { transition-duration: var(--motion-micro); }
.motion-demo--standard .motion-demo__dot { transition-duration: var(--motion-standard); }
.motion-demo--panel    .motion-demo__dot { transition-duration: var(--motion-panel); }

/* ---- Easing track (visualization) ---- */
.ease-track {
  height: 64px;
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}
.ease-track__line {
  position: absolute; top: 50%; left: 0; right: 0;
  height: 1px; background: var(--border-strong);
  margin-top: -0.5px;
}
.ease-track__dot {
  position: absolute; top: 50%; width: 12px; height: 12px;
  margin-top: -6px; margin-left: -6px;
  background: var(--color-accent);
  border-radius: var(--radius-pill);
  animation: ease-glide 2.4s var(--ease) infinite;
}
@keyframes ease-glide {
  0%, 100% { left: 0%;   transform: scale(0.8); }
  45%      { left: 100%; transform: scale(1); }
  55%      { left: 100%; transform: scale(1); }
}
@media (prefers-reduced-motion: reduce) {
  .ease-track__dot { animation: none; left: 50%; }
}

/* ---- Icon grid ---- */
.icon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: var(--space-2);
}
.icon-tile {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--surface-raised);
  border: 1px solid var(--border);
  transition: border-color var(--motion-standard) var(--ease),
              background var(--motion-standard) var(--ease);
}
.icon-tile:hover { border-color: var(--border-strong); background: var(--surface-hover); }
.icon-tile svg { width: 20px; height: 20px; color: var(--ink); stroke-width: 1.8; }
.icon-tile__name { font: var(--type-mono); font-size: 10px; color: var(--ink-subtle); }

/* ---- Density preview ---- */
.density-stack {
  display: flex; flex-direction: column; gap: var(--space-4);
}
.density-table {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  font: var(--type-body);
}
.density-table th, .density-table td {
  padding: 0 var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--border);
  height: var(--row-height);
  vertical-align: middle;
}
.density-table th {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: var(--ink-subtle);
  background: var(--surface-sunken);
}
.density-table tr:last-child td { border-bottom: 0; }
.density-table--compact td, .density-table--compact th { height: 24px; font-size: 12px; }
.density-table--loose td,   .density-table--loose th   { height: 44px; font-size: 15px; }

/* ---- Status alerts (color section demo) ---- */
.alert {
  display: flex; align-items: flex-start; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface-raised);
  font: var(--type-body);
}
.alert + .alert { margin-top: var(--space-2); }
.alert__icon { flex: 0 0 auto; margin-top: 1px; }
.alert__icon svg { width: 16px; height: 16px; stroke-width: 1.8; }
.alert__title { font: var(--type-body-strong); margin: 0 0 2px; }
.alert__msg   { color: var(--ink-muted); margin: 0; font-size: 13px; }

.alert--info    { border-left: 3px solid var(--color-state-info); }
.alert--info    .alert__icon { color: var(--color-state-info); }
.alert--success { border-left: 3px solid var(--color-state-success); }
.alert--success .alert__icon { color: var(--color-state-success); }
.alert--caution { border-left: 3px solid var(--color-state-caution); }
.alert--caution .alert__icon { color: var(--color-state-caution); }
.alert--danger  { border-left: 3px solid var(--color-state-danger); }
.alert--danger  .alert__icon { color: var(--color-state-danger); }

/* ---- Snippet (code block w/ copy) ---- */
.snippet {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-sunken);
  margin: var(--space-4) 0;
  overflow: hidden;
}
.snippet__head {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  font: var(--type-caption);
  color: var(--ink-muted);
  border-bottom: 1px solid var(--border);
}
.snippet__copy {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  color: var(--ink-muted);
  transition: background var(--motion-micro) var(--ease),
              color var(--motion-micro) var(--ease);
}
.snippet__copy:hover { background: var(--surface-hover); color: var(--ink); }
.snippet__copy svg { width: 12px; height: 12px; stroke-width: 2; }
.snippet__code {
  margin: 0; padding: var(--space-3);
  font: var(--type-mono);
  color: var(--ink);
  overflow-x: auto;
  white-space: pre;
}

/* ---- Buttons (used on index page proof composition) ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  height: var(--control-height-md);
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  font: var(--type-body-strong);
  font-size: 13px;
  cursor: pointer;
  user-select: none;
  transition: background var(--motion-standard) var(--ease),
              color var(--motion-standard) var(--ease),
              border-color var(--motion-standard) var(--ease),
              transform var(--motion-micro) var(--ease),
              box-shadow var(--motion-standard) var(--ease);
}
.btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

/* :active — the press response. Designed to feel like the button physically
   gets pushed. Combines: (a) translate down 2 px, (b) scale 0.96 (a clear
   squish, not a subtle hint), (c) deeper inset shadow giving the surface
   a pressed-in look, (d) micro filter darken so even outlined buttons
   register the press, (e) instant transition on press, gentle ease back
   on release. */
.btn:active {
  transform: translateY(2px) scale(0.96);
  box-shadow: inset 0 3px 8px rgba(15,23,42,0.28), inset 0 1px 1px rgba(15,23,42,0.16);
  filter: brightness(0.94);
  transition: transform 40ms cubic-bezier(0.4, 0, 0.6, 1),
              box-shadow 40ms cubic-bezier(0.4, 0, 0.6, 1),
              filter 40ms cubic-bezier(0.4, 0, 0.6, 1),
              background 40ms cubic-bezier(0.4, 0, 0.6, 1);
}

.btn--primary {
  background: var(--color-action-bg);
  color: var(--color-action-fg);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,0.06);
  position: relative;
}
.btn--primary::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: var(--color-accent); opacity: 0;
  transition: opacity var(--motion-standard) var(--ease);
}
.btn--primary:hover {
  background: var(--color-action-bg-hover);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255,255,255,0.08);
}
.btn--primary:hover::after { opacity: 1; }
/* Pressed primary — deep black + heavy inset shadow + accent underline. */
.btn--primary:active {
  background: #000;
  box-shadow: inset 0 4px 10px rgba(0,0,0,0.6), inset 0 1px 2px rgba(255,255,255,0.04);
  filter: brightness(0.9);
}
.btn--primary:active::after { opacity: 1; height: 3px; }

/* Coloured primary — explicit action colour, used sparingly */
.btn--accent {
  background: var(--color-accent);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.btn--accent:hover {
  filter: brightness(0.94);
  box-shadow: var(--shadow-md);
}
.btn--accent:active {
  filter: brightness(0.85);
  box-shadow: inset 0 2px 6px rgba(0,0,0,0.18);
}
/* When accent is yellow, force ink text (already the case) but be explicit */
.accent-yellow .btn--accent { color: var(--ink); }

.btn--secondary {
  background: var(--surface-raised);
  color: var(--ink);
  border: 1px solid var(--border-strong);
}
.btn--secondary:hover {
  background: var(--surface-hover);
  border-color: var(--color-accent-readable);
  color: var(--color-accent-readable);
}
.btn--secondary:active {
  background: var(--surface-sunken);
  border-color: var(--color-accent-readable);
  box-shadow: inset 0 2px 4px rgba(15,23,42,0.12);
}

.btn--ghost {
  background: transparent;
  color: var(--ink-muted);
}
.btn--ghost:hover { background: var(--surface-hover); color: var(--ink); }
.btn--ghost:active {
  background: color-mix(in srgb, var(--ink) 8%, transparent);
  color: var(--ink);
  box-shadow: inset 0 1px 3px rgba(15,23,42,0.12);
}

.btn--lg { height: var(--control-height-lg); padding: 0 var(--space-5); font-size: 14px; }

.btn svg { width: 14px; height: 14px; stroke-width: 2; }

/* ---- Card (used for references grid + proof composition) ---- */
.card {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  position: relative;
  overflow: hidden;
  transition: border-color var(--motion-standard) var(--ease),
              box-shadow var(--motion-standard) var(--ease),
              transform var(--motion-standard) var(--ease);
}
.card::after {
  content: ''; position: absolute; left: 0; top: 0; height: 4px; width: 64px;
  background: var(--color-accent);
  transform: scaleX(0); transform-origin: left;
  transition: transform var(--motion-panel) var(--ease), width var(--motion-panel) var(--ease);
}
.card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.card:hover::after { transform: scaleX(1); width: 96px; }
.card__eyebrow {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent-readable);
  margin: 0 0 var(--space-2);
  font-weight: 600;
}
.card__title {
  font: var(--type-heading-lg);
  margin: 0 0 var(--space-2);
}
.card__lede {
  font: var(--type-caption);
  color: var(--ink-muted);
  margin: 0;
}

.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}
.ref-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background: var(--surface-raised);
  position: relative;
  overflow: hidden;
  transition: border-color var(--motion-standard) var(--ease),
              transform var(--motion-standard) var(--ease),
              box-shadow var(--motion-standard) var(--ease);
  display: block;
}
.ref-card::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 5px;
  background: var(--color-accent);
  transform: scaleY(0); transform-origin: top;
  transition: transform var(--motion-standard) var(--ease);
}
.ref-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.ref-card:hover::before { transform: scaleY(1); }
.ref-card__name { font: var(--type-heading-md); margin: 0 0 var(--space-1); }
.ref-card__desc { font: var(--type-caption); color: var(--ink-muted); margin: 0; }
.ref-card__cta {
  display: inline-flex; align-items: center; gap: 2px;
  font: var(--type-caption);
  color: var(--color-accent-readable);
  margin-top: var(--space-2);
  font-weight: 500;
}
.ref-card__cta svg { width: 12px; height: 12px; stroke-width: 2; }

/* ---- Stat card — left side-stripe, rainbow by position ----
   Bare .stat cards cycle through the five brand colours by position in their
   container. Semantic modifiers (.stat--success / --info / --caution / --danger /
   --brand) override --stat-stripe and paint the left bar in their state colour. */
.stat {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  padding-left: calc(var(--space-4) + 4px);
  background: var(--surface-raised);
  display: flex; flex-direction: column; gap: var(--space-1);
  min-width: 0;
  position: relative;
  overflow: hidden;
  transition: border-color var(--motion-standard) var(--ease),
              transform var(--motion-standard) var(--ease),
              box-shadow var(--motion-standard) var(--ease);
}
.stat:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
.stat::before {
  content: ''; position: absolute; top: 0; left: 0; bottom: 0; width: 4px;
  background: var(--stat-stripe, var(--stat-rainbow, var(--color-accent)));
}
.stat:nth-child(5n+1) { --stat-rainbow: var(--brand-cyan); }
.stat:nth-child(5n+2) { --stat-rainbow: var(--brand-magenta); }
.stat:nth-child(5n+3) { --stat-rainbow: var(--brand-green); }
.stat:nth-child(5n+4) { --stat-rainbow: var(--brand-yellow); }
.stat:nth-child(5n+5) { --stat-rainbow: var(--brand-purple); }
.stat--info    { --stat-stripe: var(--color-state-info); }
.stat--success { --stat-stripe: var(--color-state-success); }
.stat--caution { --stat-stripe: var(--color-state-caution); }
.stat--danger  { --stat-stripe: var(--color-state-danger); }
.stat--brand   { --stat-stripe: var(--brand-purple); }
.stat--quiet::before { display: none; }

.stat__label {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: var(--ink-subtle);
  padding-top: var(--space-1);
}
.stat__value {
  font: var(--type-display-lg);
  margin: 0;
  color: var(--ink);
}
.stat__delta {
  display: inline-flex; align-items: center; gap: 4px;
  font: var(--type-mono);
  font-size: 11px;
  color: var(--color-state-success);
}
.stat__delta--down { color: var(--color-state-danger); }
.stat__delta svg { width: 10px; height: 10px; stroke-width: 2.5; }

/* ---- Principle list (numbered) ---- */
.principles { display: flex; flex-direction: column; }
.principle {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: var(--space-4);
  align-items: baseline;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--border);
}
.principle:last-child { border-bottom: 0; }
.principle__num {
  font: var(--type-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--color-accent-readable);
  letter-spacing: 0.04em;
}
.principle__text { font: var(--type-body); font-size: 15px; line-height: 1.55; margin: 0; }
.principle__text strong { color: var(--ink); font-weight: 600; }

/* ---- Proof composition (mini stat row + buttons) ---- */
.proof {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
}
.proof::before {
  content: ''; position: absolute; left: 0; right: 0; top: 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--brand-magenta) 0%,
    var(--brand-magenta) 25%,
    var(--brand-cyan) 25%,
    var(--brand-cyan) 50%,
    var(--brand-green) 50%,
    var(--brand-green) 75%,
    var(--brand-yellow) 75%,
    var(--brand-yellow) 100%
  );
}
.proof__head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-5); padding-top: var(--space-2); }
.proof__title { font: var(--type-display-md); margin: 0; }
.proof__stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: var(--space-3); }

/* ---- Footer ---- */
.cross-thesis-foot {
  padding: var(--space-8) var(--space-6);
  border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: var(--space-6); align-items: center;
  font: var(--type-caption);
  color: var(--ink-muted);
  max-width: 1200px;
  margin: var(--space-12) auto 0;
}
.cross-thesis-foot__group { display: flex; flex-wrap: wrap; gap: var(--space-4); align-items: center; }
.cross-thesis-foot a {
  color: var(--ink);
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 1px;
  transition: border-color var(--motion-standard) var(--ease),
              color var(--motion-standard) var(--ease);
}
.cross-thesis-foot a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---- Utility ---- */
.muted   { color: var(--ink-muted); }
.subtle  { color: var(--ink-subtle); }
.mono    { font: var(--type-mono); }
.divider {
  height: 3px;
  background: linear-gradient(90deg,
    var(--color-accent) 0%,
    var(--color-accent) 80px,
    var(--border) 80px,
    var(--border) 100%);
  margin: var(--space-8) 0;
  border: 0;
  border-radius: var(--radius-pill);
}
.eyebrow--inline { display: inline; }

/* ===========================================================
   Title blocks — coloured surfaces for catalogue / marketing.

   Three variants:
     · .title-banner   — full-width filled hero block (catalogue page heads,
                         marketing section dividers).
     · .title-block    — small inline accent eyebrow (section markers in
                         long-form content).
     · .title-callout  — accent-tinted side-bar block (highlights, quotes,
                         "read this first" notices).

   All three use the PAGE TOPIC ACCENT set via <body class="accent-cyan"> etc.
   Don't deploy on dense work surfaces — they fight tables and status badges.
   =========================================================== */

/* Variant 1 · Filled banner */
.title-banner {
  display: flex; flex-direction: column;
  gap: 8px;
  padding: var(--space-8) var(--space-6);
  background: var(--color-accent);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
  position: relative;
  overflow: hidden;
}
.title-banner__eyebrow {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
  display: inline-flex; align-items: center; gap: 8px;
}
.title-banner__eyebrow::before {
  content: ''; width: 24px; height: 1px; background: rgba(255,255,255,0.7);
}
.title-banner__title {
  font: var(--type-display-xl);
  margin: 0;
  color: #FFFFFF;
  letter-spacing: -0.01em;
}
.title-banner__lede {
  font: 500 16px/1.5 var(--font-ui);
  color: rgba(255, 255, 255, 0.88);
  max-width: 60ch;
  margin: 6px 0 0;
}
.title-banner__lede a {
  color: #FFFFFF;
  border-bottom: 1px solid rgba(255,255,255,0.6);
  padding-bottom: 1px;
}
/* Yellow needs ink text — same rule as buttons / chips on yellow accent */
.accent-yellow .title-banner,
.accent-yellow .title-banner .title-banner__title { color: var(--ink); }
.accent-yellow .title-banner__eyebrow { color: rgba(15, 23, 42, 0.6); }
.accent-yellow .title-banner__eyebrow::before { background: rgba(15, 23, 42, 0.4); }
.accent-yellow .title-banner__lede { color: rgba(15, 23, 42, 0.85); }
.accent-yellow .title-banner__lede a {
  color: var(--ink);
  border-bottom-color: rgba(15, 23, 42, 0.5);
}
/* Optional inset CMYK strip on the right edge — subtle brand reminder */
.title-banner--mark::after {
  content: '';
  position: absolute; top: 0; right: 0; bottom: 0;
  width: 8px;
  background: linear-gradient(
    180deg,
    var(--brand-magenta) 0% 25%,
    var(--brand-cyan)    25% 50%,
    var(--brand-yellow)  50% 75%,
    var(--brand-green)   75% 100%
  );
  opacity: 0.95;
}

/* Variant 2 · Inline accent block */
.title-block {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px;
  background: var(--color-accent);
  color: #FFFFFF;
  border-radius: var(--radius-sm);
  font: var(--type-eyebrow);
  font-size: 11px;
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  margin: 0 0 var(--space-3);
}
.title-block svg { width: 12px; height: 12px; }
.accent-yellow .title-block { color: var(--ink); }
/* Variants — explicit colour override when you want to deviate from the
   page topic accent (use sparingly, e.g. in marketing pages). */
.title-block--magenta { background: var(--brand-magenta); color: #FFFFFF; }
.title-block--cyan    { background: var(--brand-cyan);    color: #FFFFFF; }
.title-block--green   { background: var(--brand-green);   color: #FFFFFF; }
.title-block--purple  { background: var(--brand-purple);  color: #FFFFFF; }
.title-block--yellow  { background: var(--brand-yellow);  color: var(--ink); }

/* Variant 3 · Callout / pull-quote */
.title-callout {
  padding: var(--space-4) var(--space-5);
  background: color-mix(in srgb, var(--color-accent) 8%, var(--surface-raised));
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--space-4) 0;
}
.title-callout__eyebrow {
  font: var(--type-eyebrow);
  letter-spacing: var(--letter-eyebrow);
  text-transform: uppercase;
  color: var(--color-accent-readable);
  display: block;
  margin-bottom: 4px;
}
.title-callout__body {
  font: var(--type-body);
  color: var(--ink);
  margin: 0;
}
.title-callout__body em { font-style: italic; color: var(--ink-muted); }
.title-callout__body a {
  color: var(--color-accent-readable);
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

/* Ink-theme: callouts get a slightly stronger tint since surface is dark */
[data-theme="ink"] .title-callout {
  background: color-mix(in srgb, var(--color-accent) 14%, var(--surface-raised));
}