/* =========================================================================
   system.css — styles specific to the substrate review page (system.html)
   These are presentational for the brand audit, not site components.
   ========================================================================= */

.skip {
  position: absolute; top: -40px; left: 0;
  background: var(--brand-blue-deep); color: white;
  padding: 0.5rem 1rem; text-decoration: none; z-index: 100;
}
.skip:focus { top: 0; }

/* ===== HEADER ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  width: 100%;
  border-bottom: 1px solid var(--glass-border);
}
.site-header__inner {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 0.85rem var(--spacing-inline);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-6);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--text-heading);
}
.brand img {
  height: 36px;
  width: auto;
  object-fit: contain;
}
.brand__wordmark {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.005em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.35em;
}
.brand__word--green { color: var(--brand-green-spice); }
.brand__word--blue  { color: var(--brand-blue-mark); }
.brand__word--mono  {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-left: 0.25rem;
  padding-left: 0.65rem;
  border-left: 1px solid var(--border-strong);
}
.site-nav {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}
.site-nav a {
  font-family: var(--font-reading);
  font-size: 0.95rem;
  color: var(--text-body);
  text-decoration: none;
  position: relative;
  padding-bottom: 2px;
  transition: color var(--dur-fast) var(--ease-out);
}
.site-nav a:hover { color: var(--brand-blue-deep); }
.site-nav a[aria-current="page"] {
  color: var(--text-heading);
  font-weight: 500;
}
.site-nav a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--brand-blue-mark);
}
.site-header__util { display: inline-flex; align-items: center; gap: 0.5rem; }
.iconbtn {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  color: var(--text-body);
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out);
}
.iconbtn:hover { background: var(--surface-alt); border-color: var(--border); }
.btn--sm { padding: 0.45rem 0.9rem; font-size: 0.9rem; }
@media (max-width: 1080px) {
  .site-nav { gap: 1rem; }
  .site-nav a { font-size: 0.9rem; }
}
/* mobile nav toggle (hamburger) — hidden on desktop, shown < 960px */
.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-base);
  color: var(--text-heading);
  cursor: pointer;
}
.nav-toggle:hover { background: var(--surface-alt); border-color: var(--border); }
.nav-toggle svg { display: block; }
.nav-toggle__close { display: none; }
.nav-toggle.is-open .nav-toggle__open { display: none; }
.nav-toggle.is-open .nav-toggle__close { display: block; }

@media (max-width: 960px) {
  .site-nav { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-header__inner { grid-template-columns: auto 1fr auto; }
  .brand__word--mono { display: none; }
  /* the nav becomes a full-width dropdown panel under the sticky header when opened */
  .site-nav.is-open {
    display: flex;
    flex-direction: column;
    gap: 0;
    justify-content: flex-start;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--surface-raised);
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    padding: 0.25rem var(--spacing-inline) 1rem;
    max-height: calc(100vh - 4rem);
    overflow-y: auto;
  }
  .site-nav.is-open a {
    padding: 0.85rem 0.25rem;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--border);
  }
  .site-nav.is-open a[aria-current="page"]::after { display: none; }
}

/* ===== SECTIONS ===== */
.sys-section {
  padding-block: var(--spacing-section);
  position: relative;
}
.sys-section--alt {
  background: var(--surface-alt);
  border-block: 1px solid var(--border);
}
.sys-section__inner { display: block; }
.sys-section__head {
  max-width: 56rem;
  margin-bottom: var(--spacing-block);
}
.sys-section__head h2 {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-block: 0.5rem 1rem;
}
.sys-section__intro {
  font-size: var(--size-lead);
  line-height: 1.5;
  color: var(--text-body);
  max-width: 44rem;
  text-wrap: pretty;
}

/* ===== MANIFESTO ===== */
.sys-section--manifesto {
  padding-block: clamp(5rem, 10vw, 9rem);
  position: relative;
  overflow: hidden;
}
.sys-section--manifesto::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-frame);
}
.manifesto-h1 {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 6vw, 5.5rem);
  font-weight: 380;
  font-style: normal;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-block: 1.5rem 2rem;
  max-width: 22ch;
  text-wrap: balance;
  font-variation-settings: "opsz" 144, "SOFT" 50;
}
.manifesto-lede {
  font-size: clamp(1.15rem, 1.5vw, 1.4rem);
  line-height: 1.55;
  color: var(--text-body);
  max-width: 42rem;
  margin-bottom: var(--spacing-block);
  text-wrap: pretty;
}
.manifesto-rules {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-7);
  padding-block: var(--space-6);
  border-top: 1px solid var(--border);
  max-width: 64rem;
}
.manifesto-rules .rule-text {
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.35;
  color: var(--text-heading);
  font-weight: 400;
  margin: 0.5rem 0 0;
  text-wrap: balance;
}
@media (max-width: 760px) {
  .manifesto-rules { grid-template-columns: 1fr; gap: var(--space-5); }
}

/* ===== MARK DISPLAY ===== */
.mark-display {
  display: grid;
  grid-template-columns: 1fr 24rem;
  gap: var(--space-7);
  align-items: stretch;
}
@media (max-width: 880px) {
  .mark-display { grid-template-columns: 1fr; }
}
.mark-display__stage {
  position: relative;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  aspect-ratio: 4 / 3;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.mark-display__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(var(--brand-green-rgb),0.06), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(var(--brand-blue-rgb),0.08), transparent 50%);
}
.mark-display__logo {
  position: relative;
  width: min(60%, 320px);
  height: auto;
  filter: drop-shadow(0 8px 24px rgba(26,23,20,0.10));
}
.mark-display__meta {
  align-self: stretch;
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--border);
}
.swatch-row {
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  gap: 0.5rem;
}
.swatch-row li {
  display: grid;
  grid-template-columns: 1.5rem auto 1fr;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
}
.swatch {
  display: inline-block;
  width: 1.25rem; height: 1.25rem;
  border-radius: 2px;
  border: 1px solid rgba(0,0,0,0.08);
}
.swatch-row em {
  font-style: normal;
  font-family: var(--font-reading);
  color: var(--text-muted);
}
.gradient-strip {
  height: 24px;
  background: var(--gradient-frame);
  margin-block: 0.5rem;
  border-radius: 2px;
}
.meta-note {
  font-size: var(--size-small);
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0.5rem 0 0;
}

/* ===== TYPE SPECIMENS ===== */
.type-specimen {
  display: grid;
  grid-template-columns: 18rem 1fr;
  gap: var(--space-7);
  padding-block: var(--space-7);
  border-top: 1px solid var(--border);
}
.type-specimen:first-of-type { border-top: 1px solid var(--border-strong); }
@media (max-width: 880px) {
  .type-specimen { grid-template-columns: 1fr; gap: var(--space-5); }
}
.type-specimen__label .type-name {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 400;
  margin-block: 0.5rem 0.5rem;
}
.type-specimen__label .type-role {
  font-size: var(--size-small);
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.5;
}
.type-meta {
  list-style: none; padding: 0; margin: 0;
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  display: grid; gap: 0.25rem;
}
.type-meta li {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 0.5rem;
}
.type-meta span {
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.7rem;
}
.specimen-display {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 380;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-block: 0 0.5rem;
  color: var(--text-heading);
  font-variation-settings: "opsz" 144, "SOFT" 60;
}
.specimen-display--sub {
  font-size: clamp(1.25rem, 2vw, 1.875rem);
  font-style: italic;
  font-weight: 380;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.25;
  letter-spacing: -0.005em;
}
.specimen-lede {
  font-family: var(--font-reading);
  font-size: var(--size-lead);
  line-height: 1.45;
  color: var(--text-heading);
  margin-block: 0 1.5rem;
  max-width: 36rem;
}
.specimen-body {
  max-width: 36rem;
  font-size: var(--size-body);
  line-height: var(--lh-body);
  margin-block: 0 1rem;
}
.type-specimen__sample--data { display: grid; gap: 0.6rem; }
.data-row {
  display: grid;
  grid-template-columns: 9rem 6.5rem 4rem;
  gap: 1rem;
  align-items: baseline;
  padding-block: 0.4rem;
  border-bottom: 1px dashed var(--border);
}
.data-row:last-of-type { border-bottom: none; }
.data-label {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  font-weight: 500;
}
.data-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-heading);
  font-variant-numeric: tabular-nums;
}
.data-delta {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  color: var(--text-muted);
}
.rfc-line {
  margin-top: 1.25rem;
  font-family: var(--font-reading);
  font-size: var(--size-small);
  line-height: 1.6;
  max-width: 36rem;
  color: var(--text-body);
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* ===== COLOR SCALES ===== */
.color-section { margin-bottom: var(--space-7); }
.scale-row {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 4px;
  margin-top: 0.75rem;
}
.scale-row--small { grid-template-columns: repeat(5, minmax(0, 14rem)); justify-content: start; }
.swatch-cell { font-family: var(--font-mono); }
.swatch-cell__chip {
  height: 80px;
  border: 1px solid rgba(0,0,0,0.06);
}
.swatch-cell__step {
  font-size: var(--size-tiny);
  font-weight: 500;
  color: var(--text-heading);
  margin: 0.4rem 0 0;
}
.swatch-cell__name {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin: 0;
}
.color-pairs {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
@media (max-width: 880px) { .color-pairs { grid-template-columns: 1fr; } }
.pair-card {
  padding: var(--space-5);
  background: var(--surface-raised);
  border: 1px solid var(--border);
}
.pair-card .eyebrow { margin-bottom: 0.75rem; }
.pair-sample {
  font-family: var(--font-reading);
  font-size: 1.0625rem;
  line-height: 1.55;
  margin-block: 0 0.75rem;
}
.pair-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin: 0;
  letter-spacing: 0.04em;
}

/* ===== GLASS COMPARISON ===== */
.glass-comparison {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
@media (max-width: 880px) { .glass-comparison { grid-template-columns: 1fr; } }
.glass-sample__label {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-block: 0 0.5rem;
}
.glass-sample__label code {
  font-family: var(--font-mono);
  color: var(--brand-blue-deep);
  text-transform: lowercase;
  letter-spacing: 0;
}
.glass-sample--lead .glass-sample__label { color: var(--brand-blue-deep); }
.glass-stage {
  position: relative;
  height: 220px;
  border: 1px solid var(--border-strong);
  overflow: hidden;
}
.glass-stage__bg {
  position: absolute; inset: 0;
  background: var(--gradient-frame);
  background-size: 200% 200%;
  background-position: 30% 40%;
}
.glass-stage__bg::after {
  content: "";
  position: absolute; inset: 0;
  background:
    repeating-linear-gradient(0deg, transparent 0 30px, rgba(255,255,255,0.04) 30px 31px),
    repeating-linear-gradient(90deg, transparent 0 30px, rgba(255,255,255,0.04) 30px 31px);
}
.glass-stage__chip {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  padding: 0.85rem 1rem;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: var(--radius-base);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  text-align: left;
  max-width: calc(100% - 2rem);
  width: max-content;
}
.glass-stage__chip .rail-card__label { margin-bottom: 0.35rem; }
.glass-stage__chip .data-row {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0;
  border: none;
  margin: 0;
  grid-template-columns: none;
}
.glass-stage__chip .data-value { font-size: 1.35rem; }

/* ===== PUPPY ===== */
.puppy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
@media (max-width: 980px) { .puppy-grid { grid-template-columns: 1fr; } }
.puppy-state__label {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-block: 0 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  display: inline-block;
}
.dot--live    { background: var(--green-500); box-shadow: 0 0 0 0 rgba(var(--brand-green-rgb),0.6); animation: pulse 2s ease-out infinite; }
.dot--stale   { background: var(--warning); }
.dot--offline { background: var(--neutral-400); }
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(var(--brand-green-rgb),0.5); }
  70%  { box-shadow: 0 0 0 10px rgba(var(--brand-green-rgb),0); }
  100% { box-shadow: 0 0 0 0 rgba(var(--brand-green-rgb),0); }
}

/* ===== PUPPY WIDGET ===== */
.puppy {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  padding: var(--space-5) var(--space-5) var(--space-4);
  position: relative;
  font-family: var(--font-reading);
}
.puppy--live::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--gradient-frame);
}
.puppy__head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.puppy__center {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  margin: 0;
  color: var(--text-heading);
}
.puppy__sub {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  margin: 0.25rem 0 0;
  letter-spacing: 0.02em;
}
.puppy__status {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.puppy__pulse {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green-500);
  animation: pulse 2s ease-out infinite;
}
.puppy__status-label { color: var(--green-700); font-weight: 500; }
.puppy__status-label--stale { color: var(--warning); }
.puppy__status-label--offline { color: var(--neutral-500); }
.puppy__age {
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 0.7rem;
  margin-left: 0.5rem;
  padding-left: 0.5rem;
  border-left: 1px solid var(--border);
}
.puppy__rows { display: grid; gap: 0.1rem; }
.puppy-row {
  display: grid;
  grid-template-columns: 7rem 1fr 6rem 3.5rem;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.45rem;
  border-bottom: 1px dashed var(--border);
}
.puppy-row:last-child { border-bottom: none; }
.puppy-row__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}
.puppy-row__value {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-heading);
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.puppy-row__unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-left: 0.15rem;
}
.puppy-row__delta {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  color: var(--text-muted);
  text-align: right;
}
.puppy-row__hidden { color: var(--neutral-400); }
.puppy-spark { color: var(--brand-blue-mark); display: block; }
.puppy__foot {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  font-size: var(--size-small);
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.4;
}
.puppy--stale .puppy-row__value,
.puppy--stale .puppy-row__delta { color: var(--text-muted); }
.puppy--offline { background: var(--surface-alt); }
.puppy--offline .puppy-row__value { color: var(--neutral-400); font-style: italic; font-size: 1rem; }

/* ===== COMPONENT ROWS ===== */
.component-row {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: var(--space-7);
  padding-block: var(--space-7);
  border-top: 1px solid var(--border);
}
.component-row:first-of-type { border-top: 1px solid var(--border-strong); }
@media (max-width: 880px) {
  .component-row { grid-template-columns: 1fr; gap: var(--space-4); }
}
.component-row__label {
  position: sticky;
  top: 6rem;
  align-self: start;
}
.component-row__label .eyebrow { margin-bottom: 0.5rem; }
.component-row__label .component-row__note {
  font-size: var(--size-small);
  color: var(--text-muted);
  margin-block: 0.5rem 0;
  line-height: 1.5;
  max-width: 14rem;
}
.component-row__label code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--surface-alt);
  padding: 1px 5px;
  border-radius: 2px;
  color: var(--text-body);
}
.component-row__demo--narrow { max-width: 24rem; }

/* ===== VOICE ===== */
.voice-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.5fr;
  gap: var(--space-6);
}
@media (max-width: 980px) { .voice-grid { grid-template-columns: 1fr; } }
.voice-list { list-style: none; padding: 0; margin: 0.75rem 0 0; display: grid; gap: 0.5rem; }
.voice-list li {
  font-family: var(--font-reading);
  font-size: var(--size-small);
  line-height: 1.45;
  padding-left: 1.5rem;
  position: relative;
}
.voice-list--yes li::before {
  content: "+";
  font-family: var(--font-mono);
  position: absolute; left: 0; top: 0;
  color: var(--green-700);
  font-weight: 500;
}
.voice-list--no li::before {
  content: "×";
  font-family: var(--font-mono);
  position: absolute; left: 0; top: 0;
  color: var(--neutral-500);
}
.voice-refrains ul {
  list-style: none; padding: 0; margin: 0.75rem 0 0;
  display: grid; gap: 0.75rem;
}
.voice-refrains q {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-style: italic;
  color: var(--text-heading);
  font-weight: 400;
  quotes: """ """ "'" "'";
  line-height: 1.35;
}

/* =========================================================================
   TABLE OF CONTENTS — between manifesto and 01·Mark
   ========================================================================= */
.sys-toc {
  padding-block: var(--space-7);
  border-block: 1px solid var(--border);
  background: var(--surface);
}
.sys-toc__head {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border);
}
.sys-toc__head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 400;
  margin: 0.3rem 0 0;
  letter-spacing: -0.01em;
}
.sys-toc__meta {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-align: right;
}
.sys-toc__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (max-width: 880px) { .sys-toc__grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .sys-toc__grid { grid-template-columns: 1fr; } }
.sys-toc__item {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0.35rem;
  padding: 1.1rem 1.15rem 1rem;
  background: var(--surface);
  text-decoration: none;
  color: var(--text-body);
  isolation: isolate;
  transition: background var(--dur-base) var(--ease-out);
  min-height: 7.5rem;
}
.sys-toc__item::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--brand-blue-mark);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.sys-toc__item:hover { background: var(--surface-raised); }
.sys-toc__item:hover::before { opacity: 1; }
.sys-toc__num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}
.sys-toc__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
  line-height: 1.2;
  color: var(--text-heading);
  margin: 0;
}
.sys-toc__desc {
  font-family: var(--font-reading);
  font-size: var(--size-small);
  color: var(--text-muted);
  line-height: 1.45;
  margin: 0.1rem 0 0;
  text-wrap: pretty;
}
.sys-toc__count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  padding-top: 0.5rem;
  margin-top: 0.4rem;
  border-top: 1px dashed var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sys-toc__count::after {
  content: "→";
  font-family: var(--font-reading);
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: transform var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.sys-toc__item:hover .sys-toc__count::after {
  transform: translateX(3px);
  color: var(--brand-blue-deep);
}

/* =========================================================================
   PART chrome — the canonical wrapper for every catalog item.
   Header (name · class · purpose) → demo (real render) → code-toggle → meta.
   ========================================================================= */
.parts {
  display: grid;
  gap: var(--space-5);
}
.parts--cols-2 { grid-template-columns: repeat(2, 1fr); }
.parts--cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 980px) {
  .parts--cols-2, .parts--cols-3 { grid-template-columns: 1fr; }
}

.part {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
}
.part__head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: start;
  padding: 1rem 1.25rem 0.9rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-raised);
}
.part__id { min-width: 0; }
.part__name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  line-height: 1.15;
  color: var(--text-heading);
  margin: 0 0 0.2rem;
  letter-spacing: -0.005em;
}
.part__class {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--brand-blue-deep);
  letter-spacing: 0.02em;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.part__class code {
  background: var(--surface);
  padding: 1px 6px;
  border-radius: 2px;
  border: 1px solid var(--border);
  font-size: 0.95em;
}
.part__tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  border: 1px solid var(--border-strong);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  line-height: 1;
  align-self: start;
  white-space: nowrap;
}
.part__purpose {
  grid-column: 1 / -1;
  font-family: var(--font-reading);
  font-size: var(--size-small);
  line-height: 1.5;
  color: var(--text-body);
  margin: 0.35rem 0 0;
  max-width: 60ch;
  text-wrap: pretty;
}
.part__demo {
  padding: 1.5rem 1.25rem;
  background:
    linear-gradient(var(--surface), var(--surface)) padding-box,
    repeating-linear-gradient(45deg, transparent 0 6px, rgba(var(--brand-blue-rgb),0.025) 6px 7px) padding-box;
  display: grid;
  gap: 0.85rem;
  align-content: center;
}
.part__demo--row {
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  justify-content: start;
  align-items: center;
  gap: 0.75rem;
}
.part__demo--center { justify-items: center; }
.part__demo--wide { padding-inline: 0; }
.part__demo--wide > * { width: 100%; }
.part__foot {
  border-top: 1px solid var(--border);
  background: var(--surface-raised);
}
.part__code {
  margin: 0;
  border-bottom: 1px solid var(--border);
}
.part__code:last-child { border-bottom: none; }
.part__code > summary {
  padding: 0.55rem 1.25rem;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  user-select: none;
  transition: color var(--dur-fast) var(--ease-out), background var(--dur-fast) var(--ease-out);
}
.part__code > summary::-webkit-details-marker { display: none; }
.part__code > summary::after {
  content: "+";
  font-family: var(--font-reading);
  font-size: 1rem;
  color: var(--text-muted);
  transition: transform var(--dur-base) var(--ease-out);
}
.part__code[open] > summary::after { transform: rotate(45deg); }
.part__code > summary:hover { color: var(--brand-blue-deep); background: var(--surface-alt); }
.part__code pre {
  margin: 0;
  padding: 1rem 1.25rem 1.25rem;
  background: var(--code-bg);
  color: var(--code-fg);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}
.part__code pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; border: none; }

.part__meta {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 0.3rem 1rem;
  padding: 0.75rem 1.25rem 0.85rem;
  margin: 0;
  font-family: var(--font-reading);
  font-size: var(--size-tiny);
  line-height: 1.45;
}
.part__meta dt {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  font-weight: 500;
  align-self: baseline;
}
.part__meta dd {
  margin: 0;
  color: var(--text-body);
  text-wrap: pretty;
}
.part__meta dd code {
  font-family: var(--font-mono);
  font-size: 0.95em;
  background: var(--surface);
  padding: 1px 5px;
  border-radius: 2px;
  border: 1px solid var(--border);
  color: var(--brand-blue-deep);
}
.part__meta dd em {
  font-style: italic;
  color: var(--text-muted);
}

/* =========================================================================
   SPACING & GRID display
   ========================================================================= */
.spacing-scale {
  display: grid;
  gap: 0.5rem;
}
.spacing-scale__row {
  display: grid;
  grid-template-columns: 6rem 1fr 4rem;
  align-items: center;
  gap: 1rem;
  padding-block: 0.4rem;
  border-bottom: 1px dashed var(--border);
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
}
.spacing-scale__row:last-child { border-bottom: none; }
.spacing-scale__token { color: var(--brand-blue-deep); font-weight: 500; }
.spacing-scale__bar {
  height: 14px;
  background: var(--gradient-frame);
  opacity: 0.55;
  border-radius: 2px;
  max-width: 100%;
}
.spacing-scale__val { color: var(--text-muted); text-align: right; }

.grid-display {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: var(--space-5);
}
.grid-display__lane {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1rem;
  margin-bottom: 0.75rem;
}
.grid-display__col {
  height: 56px;
  background:
    linear-gradient(rgba(var(--brand-blue-rgb),0.07), rgba(var(--brand-blue-rgb),0.07)) padding-box,
    repeating-linear-gradient(45deg, rgba(var(--brand-blue-rgb),0.12) 0 4px, transparent 4px 8px) padding-box;
  border: 1px dashed var(--brand-blue-mark);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--brand-blue-deep);
  display: grid;
  place-items: center;
  opacity: 0.85;
}
.grid-display__labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  color: var(--text-muted);
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}
.measure-demo {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: var(--space-5);
  position: relative;
}
.measure-demo__bar {
  height: 4px;
  background: var(--brand-blue-mark);
  width: var(--reading-width);
  max-width: 100%;
  margin-bottom: 0.75rem;
  position: relative;
}
.measure-demo__bar::after {
  content: attr(data-label);
  position: absolute;
  right: 0; top: -1.5rem;
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  color: var(--brand-blue-deep);
}
.measure-demo p {
  width: var(--reading-width);
  max-width: 100%;
  font-family: var(--font-reading);
  font-size: var(--size-body);
  line-height: var(--lh-body);
  color: var(--text-body);
  margin: 0;
}
.breakpoints {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: var(--space-4);
}
@media (max-width: 880px) { .breakpoints { grid-template-columns: repeat(2,1fr); } }
.breakpoint {
  padding: var(--space-4);
  border: 1px solid var(--border);
  background: var(--surface);
}
.breakpoint__device {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin: 0 0 0.3rem;
}
.breakpoint__width {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--text-heading);
  margin: 0;
  letter-spacing: -0.01em;
}
.breakpoint__note {
  font-family: var(--font-reading);
  font-size: var(--size-tiny);
  color: var(--text-muted);
  margin: 0.4rem 0 0;
  line-height: 1.45;
}

/* =========================================================================
   MOTION display
   ========================================================================= */
.motion-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
@media (max-width: 880px) { .motion-grid { grid-template-columns: 1fr; } }
.motion-card {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: var(--space-5);
}
.motion-card__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 0.4rem;
}
.motion-card__name {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 400;
  margin: 0 0 0.5rem;
  color: var(--text-heading);
}
.motion-card__stage {
  height: 64px;
  background: var(--surface-alt);
  border: 1px dashed var(--border-strong);
  position: relative;
  overflow: hidden;
  margin-block: 0.75rem;
}
.motion-dot {
  position: absolute;
  top: 50%;
  left: 8px;
  transform: translateY(-50%);
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--brand-blue-mark);
  box-shadow: 0 2px 6px rgba(var(--brand-blue-rgb),0.35);
}
.motion-card:hover .motion-dot { animation: motion-fly 1.6s var(--ease-out) infinite; }
.motion-card--fast:hover .motion-dot { animation-duration: var(--dur-fast); animation-iteration-count: infinite; }
.motion-card--base:hover .motion-dot { animation-duration: var(--dur-base); animation-iteration-count: infinite; }
.motion-card--slow:hover .motion-dot { animation-duration: var(--dur-slow); animation-iteration-count: infinite; }
@keyframes motion-fly {
  0%, 5% { left: 8px; }
  45%, 55% { left: calc(100% - 22px); }
  95%, 100% { left: 8px; }
}
.motion-card__meta {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}
.motion-card__meta code {
  color: var(--brand-blue-deep);
}

/* Buttons + forms moved to styles.css (universal). */

/* =========================================================================
   COMPONENT ROWS — keep existing pattern for the components section,
   but tighten the label sidebar and add code-toggle support inside.
   ========================================================================= */
.component-row__code {
  margin-top: var(--space-4);
  border: 1px solid var(--border);
  background: var(--surface-raised);
}
.component-row__code summary {
  padding: 0.55rem 1rem;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.component-row__code summary::-webkit-details-marker { display: none; }
.component-row__code summary::after {
  content: "+";
  font-size: 1rem;
  color: var(--text-muted);
  transition: transform var(--dur-base) var(--ease-out);
}
.component-row__code[open] summary::after { transform: rotate(45deg); }
.component-row__code summary:hover { color: var(--brand-blue-deep); background: var(--surface-alt); }
.component-row__code pre {
  margin: 0;
  padding: 1rem 1.25rem 1.25rem;
  background: var(--code-bg);
  color: var(--code-fg);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre;
}

/* =========================================================================
   GEOMETRIC MARKS — the reusable mark vocabulary
   ========================================================================= */
.marks-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
@media (max-width: 980px) { .marks-grid { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 560px) { .marks-grid { grid-template-columns: repeat(2, 1fr); } }

.mark-tile {
  margin: 0;
  padding: 1.1rem 0.75rem 0.9rem;
  background: var(--surface);
  display: grid;
  gap: 0.6rem;
  justify-items: center;
  text-align: center;
}
.mark-tile svg {
  width: 3.5rem;
  height: 3.5rem;
  color: var(--brand-blue-mark);
  transition: color var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.mark-tile:hover svg {
  color: var(--brand-blue-deep);
  transform: scale(1.06);
}
.mark-tile:nth-child(1) svg,
.mark-tile:nth-child(3) svg,
.mark-tile:nth-child(6) svg { color: var(--brand-green-spice); }
.mark-tile:nth-child(1):hover svg,
.mark-tile:nth-child(3):hover svg,
.mark-tile:nth-child(6):hover svg { color: var(--brand-green-deep); }

.mark-tile figcaption {
  display: grid;
  gap: 0.2rem;
}
.mark-tile__name {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-heading);
}
.mark-tile__meaning {
  font-family: var(--font-reading);
  font-size: var(--size-tiny);
  color: var(--text-muted);
  line-height: 1.35;
  text-wrap: pretty;
}

/* TOC item — console gets a slight accent */
.sys-toc__item--console {
  background: linear-gradient(135deg, rgba(var(--brand-blue-rgb), 0.04), rgba(var(--brand-green-rgb), 0.04));
}
.sys-toc__item--console .sys-toc__num {
  color: var(--brand-blue-mark);
  font-size: 1rem;
}
.sys-toc__item--console::before { background: var(--brand-green-spice); }

/* =========================================================================
   THE CONSOLE — theming dashboard
   ========================================================================= */
.sys-section--console {
  background: var(--card-bg-raised);
  border-bottom: var(--rule-strong);
  position: relative;
}
.sys-section--console::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-frame);
}
.sys-console__head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-6);
  align-items: end;
  margin-bottom: var(--space-7);
  padding-bottom: var(--space-5);
  border-bottom: var(--rule-hairline);
}
.sys-console__head h2 {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 400;
  letter-spacing: var(--tracking-snug);
  margin-block: 0.5rem 1rem;
}
@media (max-width: 760px) {
  .sys-console__head { grid-template-columns: 1fr; align-items: start; }
}

.dials {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: var(--rule-hairline);
}
@media (max-width: 760px) { .dials { grid-template-columns: 1fr; } }

.dial {
  background: var(--card-bg);
  padding: var(--space-5);
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: var(--space-5);
  align-items: start;
}
.dial--wide {
  grid-column: 1 / -1;
  grid-template-columns: 12rem 1fr;
}
@media (max-width: 560px) {
  .dial, .dial--wide { grid-template-columns: 1fr; gap: var(--space-3); }
}

.dial__swatch {
  width: 100%;
  aspect-ratio: 1;
  border: var(--rule-hairline);
  background: var(--neutral-300);
  position: relative;
  overflow: hidden;
}
.dial__swatch::after {
  /* checkerboard so alpha shows */
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(45deg, rgba(0,0,0,0.04) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.04) 75%) 0 0/12px 12px,
    linear-gradient(45deg, rgba(0,0,0,0.04) 25%, transparent 25%, transparent 75%, rgba(0,0,0,0.04) 75%) 6px 6px/12px 12px;
  z-index: -1;
}

.dial__num {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  background: var(--surface-alt);
  border: var(--rule-hairline);
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 400;
  color: var(--text-heading);
  letter-spacing: var(--tracking-tight);
  font-variant-numeric: tabular-nums;
}

.dial__body { min-width: 0; }
.dial__token {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--brand-blue-deep);
  letter-spacing: var(--tracking-loose);
  margin: 0 0 0.2rem;
  word-break: break-all;
}
.dial__value {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem;
  letter-spacing: var(--tracking-flat);
  word-break: break-all;
}
.dial__desc {
  font-family: var(--font-reading);
  font-size: var(--size-small);
  line-height: 1.45;
  color: var(--text-body);
  margin: 0 0 0.5rem;
  text-wrap: pretty;
}
.dial__desc code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--brand-blue-deep);
}
.dial__downstream {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: var(--tracking-loose);
  line-height: 1.5;
  margin: 0;
  padding-top: 0.5rem;
  border-top: var(--rule-dashed);
}
.dial__downstream::before {
  content: "→  ";
  color: var(--brand-blue-mark);
}

/* Inline demos in wide dials */
.dial__demo {
  width: 100%;
  height: 100%;
  min-height: 7rem;
  display: grid;
  place-items: center;
  background: var(--surface-alt);
  border: var(--rule-hairline);
  padding: var(--space-3);
}
.dial__demo-btn {
  font-family: var(--font-reading);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-heading);
  background: var(--surface-raised);
  border: var(--rule-strong);
  border-radius: var(--radius-base);
  padding: 0.55rem 1rem;
  cursor: pointer;
  transition: box-shadow var(--dur-fast) var(--ease-out);
}
.dial__demo-btn:focus {
  outline: none;
  border-color: var(--brand-blue-mark);
  box-shadow: var(--focus-ring);
}
.dial__demo-stripe {
  width: 100%;
  height: 18px;
  background: var(--gradient-frame);
  border-radius: 2px;
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface-alt);
  padding-block: var(--space-7) var(--space-5);
  font-family: var(--font-reading);
  font-size: var(--size-small);
  color: var(--text-body);
}
/* four columns: brand · Read · Project · Join */
.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto minmax(0, 1.3fr);
  gap: var(--space-5) var(--space-7);
  align-items: start;
}
@media (max-width: 900px) {
  .site-footer__inner { grid-template-columns: 1fr 1fr; }
  .site-footer__col--brand { margin-inline: auto; }
}
@media (max-width: 540px) {
  .site-footer__inner { grid-template-columns: 1fr; text-align: center; }
  .site-footer__col { margin-inline: auto; }
  .site-footer__col ul { justify-items: center; }
}

/* brand column — round mark, mission, social icons, all centred */
.site-footer__col--brand {
  max-width: 22rem;
  text-align: center;
}
.brand--footer { display: inline-block; }
.brand--footer img {
  width: 12.375rem;                /* the round mark */
  height: 12.375rem;
  max-width: 100%;
}
.site-footer__mission {
  /* the round PNG carries ~0.97rem of transparent pad at its base; pull up
     past it so the text sits just under the visible mark */
  margin: calc(var(--space-3) * -1) auto 0;
  max-width: 22rem;
  line-height: 1.5;
  font-weight: var(--weight-bold);
  color: var(--text-muted);
}
/* scoped under .site-footer so the flex row beats .site-footer__col ul (grid) */
.site-footer .site-footer__social {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: var(--space-4);
}
.site-footer .site-footer__social a {
  display: inline-flex;
  color: var(--text-muted);
  transition: color var(--dur-fast) var(--ease-out);
}
.site-footer .site-footer__social a:hover { color: var(--brand-blue-deep); }
.site-footer .site-footer__social svg { width: 1.4rem; height: 1.4rem; }
.site-footer__heading {
  font-family: var(--font-mono);
  font-size: var(--size-tiny);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin: 0 0 var(--space-3);
}
.site-footer__col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}
.site-footer__col a {
  color: var(--text-body);
  text-decoration: none;
  font-weight: var(--weight-button);   /* bolder than body — the link standard */
  transition: color var(--dur-fast) var(--ease-out);
}
.site-footer__col a:hover { color: var(--brand-blue-deep); }
.site-footer__join {
  margin: 0 0 var(--space-3);
  line-height: 1.55;
  color: var(--text-muted);
}
.site-footer__join-link {
  color: var(--brand-blue-deep);
  text-decoration: none;
  font-weight: var(--weight-button);
}
.site-footer__join-link:hover { text-decoration: underline; }
.site-footer__baseline {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
}
.site-footer__copyright {
  font-size: var(--size-small);
  max-width: 48rem;
  line-height: 1.5;
}
.site-footer__copyright a {
  color: var(--brand-blue-deep);
  text-decoration: underline;
}
.site-footer__copyright a:hover { text-decoration: none; }