/* Hallmark · genre: editorial · macrostructure: Narrative Workflow · theme: Grid
 * axes: light cool sheet (99%) / grotesk-heavy lowercase / ultramarine signal ink (264)
 * tone: technical / austere · nav: N6 systems-manual masthead · footer: Ft5 statement
 * enrichment: hand-built SVG pipeline plate (Tier B) + Grid numeral voice
 * pre-emit critique: P5 H5 E5 S5 R5 V5
 */

@import url("tokens.css");

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

html, body {
  margin: 0;
  overflow-x: clip;
}

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  font-synthesis-weight: none;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* ------------------------------------------------------------------ *
 * grid scaffold — the 12 columns are drawn in public
 * ------------------------------------------------------------------ */

.page {
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  position: relative;
}

/* the exposed column rules, behind everything */
.rules {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  display: none;
}
@media (min-width: 60rem) {
  .rules { display: block; }
  .rules__inner {
    max-width: var(--page-max);
    height: 100%;
    margin-inline: auto;
    padding-inline: var(--gutter);
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--space-md);
  }
  .rules__col {
    border-left: var(--rule-hair) solid var(--color-rule);
    opacity: 0.55;
  }
  .rules__col:last-child { border-right: var(--rule-hair) solid var(--color-rule); }
}

.band { position: relative; z-index: 1; overflow: clip; }
.band + .band { border-top: var(--rule-hair) solid var(--color-rule); }

/* ------------------------------------------------------------------ *
 * type voices
 * ------------------------------------------------------------------ */

.label {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--color-muted);
  margin: 0;
}
.label--ink { color: var(--color-ink); }
.label--signal { color: var(--color-signal); }

h1, h2, h3 {
  font-family: var(--font-display);
  font-style: normal;
  margin: 0;
  text-wrap: balance;
  overflow-wrap: anywhere;
  min-width: 0;
}

.display {
  font-weight: var(--display-weight);
  font-size: var(--text-display);
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-display);
  text-transform: lowercase;
}

.h2 {
  font-weight: 700;
  font-size: var(--text-3xl);
  letter-spacing: -0.032em;
  line-height: var(--leading-tight);
  text-transform: lowercase;
}

.h3 {
  font-weight: 700;
  font-size: var(--text-xl);
  letter-spacing: -0.018em;
  line-height: 1.2;
}

p { margin: 0 0 var(--space-sm); max-width: var(--measure); }
.lede { font-size: var(--text-lg); line-height: 1.45; color: var(--color-ink); }
.muted { color: var(--color-muted); }

/* the period square — a solid square where a full stop would fall */
.dot::after {
  content: "";
  display: inline-block;
  width: 0.52em;
  height: 0.52em;
  margin-left: 0.16em;
  background: var(--color-signal);
  vertical-align: baseline;
}

/* the bar — a signal rule cut to a column width, never full bleed */
.bar {
  width: 4.5rem;
  height: var(--rule-bar);
  background: var(--color-signal);
  margin-bottom: var(--space-sm);
}

a { color: inherit; }

/* ------------------------------------------------------------------ *
 * N6 · systems-manual masthead
 * ------------------------------------------------------------------ */

.masthead {
  position: relative;
  z-index: 2;
  border-bottom: 2px solid var(--color-rule-strong);
  background: var(--color-paper);
}

.masthead__issue {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs) var(--space-md);
  padding-block: var(--space-2xs);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--color-muted);
}
.masthead__issue span { white-space: nowrap; }

.masthead__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm) var(--space-md);
  padding-block: var(--space-sm) var(--space-xs);
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-xl);
  letter-spacing: -0.04em;
  text-transform: lowercase;
  line-height: 1;
  text-decoration: none;
  padding-block: 0.25rem;
  transition: color var(--dur-fast) var(--ease-out);
}
.wordmark:hover, .wordmark.is-hover { color: var(--color-signal); }
.wordmark:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 4px;
}

.masthead__nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-md);
}
.masthead__nav a {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  text-decoration: none;
  color: var(--color-muted);
  white-space: nowrap;
  padding-block: 0.55rem;
  transition: color var(--dur-fast) var(--ease-out);
}
.masthead__nav a:hover, .masthead__nav a.is-hover { color: var(--color-signal); }
.masthead__nav a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  color: var(--color-ink);
}

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

.hero { padding-block: var(--space-2xl) var(--space-xl); }

.hero__display { margin-bottom: var(--space-md); }

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-lg);
  align-items: start;
}
@media (min-width: 60rem) {
  .hero__grid { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: var(--space-2xl); }
}

.hero__meta {
  border-top: 2px solid var(--color-rule-strong);
  padding-top: var(--space-sm);
}
.hero__meta dl {
  margin: 0;
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: var(--space-3xs) var(--space-sm);
  font-size: var(--text-sm);
}
.hero__meta dt {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--color-muted);
}
.hero__meta dd { margin: 0; font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------------ *
 * bands & stage sections
 * ------------------------------------------------------------------ */

.band__inner { padding-block: var(--space-2xl); }

.sect-head { margin-bottom: var(--space-lg); }
.sect-head .bar { margin-bottom: var(--space-sm); }

.stage {
  position: relative;
  padding-block: var(--space-xl);
  border-top: 2px solid var(--color-rule-strong);
}
.stage:first-of-type { border-top: none; }

.stage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-md);
}
@media (min-width: 60rem) {
  .stage__grid { grid-template-columns: minmax(0, 3fr) minmax(0, 6fr) minmax(0, 4fr); gap: var(--space-lg); }
}

.stage__no {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-2xl);
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--color-signal);
  font-variant-numeric: tabular-nums;
}

.stage__enforces {
  border-left: var(--rule-bar) solid var(--color-signal);
  padding-left: var(--space-sm);
}
.stage__enforces p { font-size: var(--text-sm); margin-bottom: var(--space-2xs); }
.stage__enforces p:last-child { margin-bottom: 0; }

code {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.92em;
  background: var(--color-paper-3);
  padding: 0.08em 0.34em;
  border-radius: var(--radius-none);
  overflow-wrap: anywhere;
}

/* the giant numeral — art, not a heading; cropped by the band edge */
.numeral {
  position: absolute;
  right: -0.06em;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-numeral);
  line-height: 0.72;
  letter-spacing: -0.06em;
  color: var(--color-ink);
  opacity: 0.055;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  font-variant-numeric: tabular-nums;
}
@media (max-width: 60rem) { .numeral { display: none; } }

/* ------------------------------------------------------------------ *
 * plates — tables set as Swiss plates
 * ------------------------------------------------------------------ */

.plate {
  border-top: 2px solid var(--color-rule-strong);
  border-bottom: 2px solid var(--color-rule-strong);
  margin-block: var(--space-md) var(--space-lg);
}
.plate__scroll { overflow-x: auto; }

table { border-collapse: collapse; width: 100%; font-size: var(--text-sm); }
caption {
  text-align: left;
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--color-muted);
  padding-block: var(--space-2xs);
}
th, td {
  text-align: left;
  padding: 0.6rem var(--space-sm) 0.6rem 0;
  border-bottom: var(--rule-hair) solid var(--color-rule);
  vertical-align: top;
}
thead th {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--color-muted);
  font-weight: 600;
  border-bottom: var(--rule-hair) solid var(--color-rule-strong);
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: none; }
td.num, th.num { font-variant-numeric: tabular-nums; white-space: nowrap; }
.win { color: var(--color-signal); font-weight: 700; }

/* ------------------------------------------------------------------ *
 * families grid
 * ------------------------------------------------------------------ */

.families {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 2px solid var(--color-rule-strong);
}
@media (min-width: 46rem) { .families { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 72rem) { .families { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

.family {
  padding: var(--space-md) var(--space-md) var(--space-lg) 0;
  border-bottom: var(--rule-hair) solid var(--color-rule);
}
@media (min-width: 46rem) {
  .family { padding-right: var(--space-lg); }
  .family:nth-child(odd) { border-right: var(--rule-hair) solid var(--color-rule); padding-right: var(--space-lg); }
}
@media (min-width: 72rem) {
  .family:nth-child(odd) { border-right: none; }
  .family:not(:nth-child(3n)) { border-right: var(--rule-hair) solid var(--color-rule); }
}
.family h3 { margin-bottom: var(--space-2xs); }
.family p { font-size: var(--text-sm); margin-bottom: 0; }
.family__ix {
  font-weight: 800;
  color: var(--color-signal);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-label);
}

/* ------------------------------------------------------------------ *
 * SVG plate
 * ------------------------------------------------------------------ */

.figure { margin: 0 0 var(--space-lg); }
.figure svg { display: block; width: 100%; height: auto; }
.figure figcaption {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--color-muted);
  font-weight: 600;
  padding-top: var(--space-2xs);
  border-top: var(--rule-hair) solid var(--color-rule);
  margin-top: var(--space-2xs);
}

/* ------------------------------------------------------------------ *
 * defects / limitations lists
 * ------------------------------------------------------------------ */

.entries { border-top: 2px solid var(--color-rule-strong); }
.entry {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2xs);
  padding-block: var(--space-md);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}
@media (min-width: 60rem) {
  .entry { grid-template-columns: minmax(0, 4fr) minmax(0, 9fr); gap: var(--space-lg); }
}
.entry h3 { font-size: var(--text-md); }
.entry p { font-size: var(--text-sm); margin-bottom: 0; }
.entry p + p { margin-top: var(--space-2xs); }

/* ------------------------------------------------------------------ *
 * Ft5 · statement footer
 * ------------------------------------------------------------------ */

.foot {
  border-top: 2px solid var(--color-rule-strong);
  padding-block: var(--space-xl) var(--space-lg);
  position: relative;
  z-index: 1;
}
.foot__statement {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--text-2xl);
  letter-spacing: -0.032em;
  line-height: 1.1;
  text-transform: lowercase;
  max-width: 26ch;
  margin: 0 0 var(--space-lg);
}
.foot__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xs) var(--space-md);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: var(--tracking-label);
  color: var(--color-muted);
  border-top: var(--rule-hair) solid var(--color-rule);
  padding-top: var(--space-sm);
}

/* ------------------------------------------------------------------ *
 * reveal — one primitive, opacity + transform only
 * ------------------------------------------------------------------ */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
  }
  .reveal.is-in { opacity: 1; transform: none; }
}

/* skip link */
.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-2xs) var(--space-sm);
  z-index: 10;
  font-weight: 600;
  text-decoration: none;
}
.skip:focus-visible { left: var(--gutter); top: var(--space-2xs); outline: 2px solid var(--color-focus); outline-offset: 2px; }

@media (max-width: 40rem) {
  .masthead__nav a { padding-block: 0.7rem; }
  .band__inner { padding-block: var(--space-xl); }
}

/* ——— dark ————————————————————————————————————————————————————
 * Grid inverted: the cool white sheet becomes a near-black sheet, and the
 * ultramarine signal lifts so it still reads as the one spent colour.
 */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-paper:        oklch(15% 0.010 258);
    --color-paper-2:      oklch(19% 0.011 258);
    --color-paper-3:      oklch(23% 0.012 258);
    --color-ink:          oklch(96% 0.004 255);
    --color-muted:        oklch(70% 0.012 255);
    --color-rule:         oklch(29% 0.010 255);
    --color-rule-strong:  oklch(96% 0.004 255);
    --color-signal:       oklch(74% 0.155 264);
    --color-signal-soft:  oklch(74% 0.155 264 / 0.16);
    --color-signal-hair:  oklch(74% 0.155 264 / 0.40);
  }
}
:root[data-theme="dark"] {
  --color-paper:        oklch(15% 0.010 258);
  --color-paper-2:      oklch(19% 0.011 258);
  --color-paper-3:      oklch(23% 0.012 258);
  --color-ink:          oklch(96% 0.004 255);
  --color-muted:        oklch(70% 0.012 255);
  --color-rule:         oklch(29% 0.010 255);
  --color-rule-strong:  oklch(96% 0.004 255);
  --color-signal:       oklch(74% 0.155 264);
  --color-signal-soft:  oklch(74% 0.155 264 / 0.16);
  --color-signal-hair:  oklch(74% 0.155 264 / 0.40);
}

/* ——— token bridge — Model Foundry's names onto the platform vocabulary ——— */
:root {
  --color-accent:      var(--color-signal);
  --color-accent-soft: var(--color-signal-soft);
  --color-neutral:     var(--color-muted);
  --color-ink-2:       var(--color-muted);
  --color-rule-2:      var(--color-rule);
  --color-focus:       var(--color-signal);
  --text-2xs:  var(--text-xs);
  --dur-micro: 130ms;
  --dur-short: 220ms;
  --dur-long:  380ms;
  --measure:   66ch;
}

/* ============================================================================
 * docs-platform reconciliation
 * The shared shell owns page width, gutters, the bar, code blocks, tables and
 * motion. These rules retire what would fight it and keep this site's own
 * banded layout working inside the document column.
 * ========================================================================== */
.dp-main .page { max-width: none; margin-inline: 0; padding-inline: 0; }
.dp-main .band { padding-block: 0; }
.dp-main .band + .band { margin-top: var(--space-2xl, 4rem); }

/* This site sets headings in lowercase Archivo; the platform's h2 rules must
 * not override that voice. */
.dp-h2.h2 { font-family: var(--font-display); text-transform: none; }
.dp-quick h3 { font-family: var(--font-body); font-weight: 600; }

/* One motion contract: .reveal obeys the same guard as .dp-reveal. */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; }
}

/* Prose inside a band holds the measure; the band's .page wrapper does not,
 * so diagrams, plates and tables keep the full column. */
.dp-main .page > p, .dp-main .page > .lede, .dp-main .page > .muted { max-width: var(--measure); }