/* AI-DE — public site.
 *
 * The tokens below are DESIGN.md's, copied by value rather than re-invented: a public site that
 * looked nothing like the product would be the first thing a reader could catch us on. Three
 * deliberate extensions are marked EXTENSION — a desktop design language has no display sizes,
 * no reading measure and no page background, because a desktop app has no page. They are additions
 * to the scale, not replacements of it: body text is still 15px and metadata is still 12px.
 *
 * Dark-committed rather than dark-adaptive. The product is Color:DarkAdaptive and its own surfaces
 * are dark; a light variant here would be a second design nobody is maintaining.
 */

:root {
  /* Surfaces & lines — DESIGN.md colors */
  --surface: #12151A;
  --surface-raised: #1A1F26;
  --surface-sunken: #0D1014;
  --border: #2A313B;
  --text: #E4E9EF;
  --text-muted: #98A3B2;
  --accent: #5B9DD9;
  --accent-contrast: #0D1014;
  --verified: #5FB98F;
  --inferred: #D8A650;
  --unverified: #98A3B2;
  --danger: #E07A6F;
  --focus: #8FC0EA;
  --locked: #D8A650;

  /* Syntax palette — DESIGN.md keeps this a separate system; chrome never colours code. */
  --syntax-keyword: #C792EA;
  --syntax-type: #82AAFF;
  --syntax-comment: #5A6472;
  --syntax-string: #C3E88D;

  /* Type — DESIGN.md scale [11,12,13,15,18,22] */
  --font-ui: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "Cascadia Mono", "Consolas", ui-monospace, "SF Mono", Menlo, monospace;
  --fs-micro: 11px;
  --fs-meta: 12px;
  --fs-small: 13px;
  --fs-body: 15px;
  --fs-lead: 18px;
  --fs-head: 22px;
  /* EXTENSION: display sizes. A desktop pane never needs a headline; a page does. */
  --fs-title: 30px;
  --fs-display: 46px;

  --weight-normal: 400;
  --weight-medium: 600;

  /* Radius, spacing, elevation, motion — DESIGN.md */
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 10px;
  --r-island: 12px;
  --s-1: 2px; --s-2: 4px; --s-3: 6px; --s-4: 8px;
  --s-5: 12px; --s-6: 16px; --s-7: 24px; --s-8: 32px;
  /* EXTENSION: page rhythm. The desktop scale tops out at 32px because a pane is not a page. */
  --s-9: 48px; --s-10: 72px;
  --elev-resting: 0 1px 3px rgba(0, 0, 0, 0.28);
  --elev-raised: 0 4px 12px rgba(0, 0, 0, 0.34);
  --motion-fast: 150ms;
  --motion-base: 200ms;
  --ease: cubic-bezier(0.2, 0, 0, 1);

  /* EXTENSION: reading measure. */
  --measure: 68ch;
  --page: 1120px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: var(--fs-body);
  line-height: 1.62;
  font-weight: var(--weight-normal);
  /* No decorative background. A hairline grid was here and the craft detector was right about it:
     a two-axis gradient grid tiled at a fixed cell is a recognised generated-UI signature, and
     "it reads as graph paper" was a rationalisation for ornament this page does not need. The
     structure comes from the content. */
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------------------------------------------------------------- skip + focus */

.skip {
  position: absolute;
  left: -9999px;
  top: var(--s-4);
  background: var(--accent);
  color: var(--accent-contrast);
  padding: var(--s-3) var(--s-5);
  border-radius: var(--r-sm);
  font-weight: var(--weight-medium);
  z-index: 50;
}
.skip:focus { left: var(--s-4); }
/* The generic `a:hover` colour would otherwise apply here and put --focus text on an --accent
   background: 1.5:1, and the only place on the site where a link sits on a filled surface. */
.skip:hover, .skip:focus { color: var(--accent-contrast); }

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

/* ---------------------------------------------------------------- shell */

.page {
  max-width: var(--page);
  margin: 0 auto;
  padding: 0 var(--s-7);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(13, 16, 20, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.topbar .page {
  display: flex;
  align-items: center;
  gap: var(--s-6);
  height: 52px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--s-4);
  font-weight: var(--weight-medium);
  letter-spacing: 0.06em;
  color: var(--text);
  text-decoration: none;
  font-size: var(--fs-small);
  text-transform: uppercase;
}

.brand svg { display: block; }

.nav {
  margin-left: auto;
  display: flex;
  gap: var(--s-2);
  flex-wrap: wrap;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: var(--fs-small);
  padding: var(--s-2) var(--s-4);
  border-radius: var(--r-sm);
  border: 1px solid transparent;
  transition: color var(--motion-fast) var(--ease), border-color var(--motion-fast) var(--ease);
}
.nav a:hover { color: var(--text); border-color: var(--border); }
.nav a[aria-current="page"] { color: var(--text); border-color: var(--border); background: var(--surface-raised); }

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

h1, h2, h3, h4 {
  font-weight: var(--weight-medium);
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: var(--fs-display); letter-spacing: -0.03em; }
h2 { font-size: var(--fs-title); margin-top: var(--s-10); }
h3 { font-size: var(--fs-head); margin-top: var(--s-8); }
h4 { font-size: var(--fs-lead); margin-top: var(--s-7); }

p { margin: var(--s-5) 0; max-width: var(--measure); }
.lead { font-size: var(--fs-lead); color: var(--text); line-height: 1.55; }
.muted { color: var(--text-muted); }
.small { font-size: var(--fs-small); }

a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--focus); }

code, kbd, samp, .mono { font-family: var(--font-mono); font-size: 0.92em; }

code {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 0.05em 0.35em;
}

kbd {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: var(--r-sm);
  padding: 0.1em 0.4em;
  font-size: var(--fs-meta);
}

/* The one label style that carries meaning: the pack's confidence vocabulary. */
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 var(--s-4);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 1px var(--s-3);
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  white-space: nowrap;
}
.chip::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
}
.chip--verified { color: var(--verified); border-color: rgba(95, 185, 143, 0.36); }
.chip--inferred { color: var(--inferred); border-color: rgba(216, 166, 80, 0.36); }
.chip--blocked  { color: var(--danger);   border-color: rgba(224, 122, 111, 0.36); }
.chip--neutral  { color: var(--text-muted); }

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

.hero { padding: var(--s-10) 0 var(--s-9); border-bottom: 1px solid var(--border); }
.hero h1 { max-width: 20ch; }
.hero .lead { max-width: 62ch; margin-top: var(--s-6); color: var(--text-muted); }
.hero .lead strong { color: var(--text); font-weight: var(--weight-medium); }

.rule {
  border: 0;
  border-top: 1px solid var(--border);
  margin: var(--s-9) 0;
}

/* Figures — the counted facts. Not a "3 feature cards" grid: these are readings. */
.readings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--r-island);
  overflow: hidden;
  background: var(--surface-raised);
  margin: var(--s-8) 0;
}

.reading {
  padding: var(--s-5) var(--s-6);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.reading:last-child { border-right: 0; }

.reading dt {
  font-size: var(--fs-meta);
  color: var(--text-muted);
  letter-spacing: 0.04em;
  margin-bottom: var(--s-2);
}
.reading dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-head);
  font-variant-numeric: tabular-nums;
  color: var(--text);
  line-height: 1.1;
}
.reading dd small { font-size: var(--fs-meta); color: var(--text-muted); font-family: var(--font-ui); }

/* ---------------------------------------------------------------- doors */

.doors { display: grid; gap: var(--s-6); grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); margin: var(--s-8) 0; }

.door {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--r-island);
  padding: var(--s-7);
  transition: border-color var(--motion-base) var(--ease), transform var(--motion-base) var(--ease);
}
.door:hover { border-color: var(--accent); transform: translateY(-2px); }
.door h3 { margin: var(--s-4) 0 var(--s-3); font-size: var(--fs-head); color: var(--text); }
.door p { margin: 0; color: var(--text-muted); font-size: var(--fs-small); max-width: none; }
.door .go {
  display: inline-block;
  margin-top: var(--s-5);
  font-size: var(--fs-small);
  color: var(--accent);
  font-weight: var(--weight-medium);
}

/* ---------------------------------------------------------------- panels & tables */

.panel {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--r-island);
  padding: var(--s-7);
  margin: var(--s-7) 0;
}
.panel > :first-child { margin-top: 0; }
.panel > :last-child { margin-bottom: 0; }

.panel--sunken { background: var(--surface-sunken); }

.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s-5);
  flex-wrap: wrap;
  margin-bottom: var(--s-5);
  padding-bottom: var(--s-4);
  border-bottom: 1px solid var(--border);
}
.panel__head h3, .panel__head h4 { margin: 0; }

.scroll-x { overflow-x: auto; margin: var(--s-6) 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-small);
}
th, td {
  text-align: left;
  padding: var(--s-4) var(--s-5);
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th {
  font-size: var(--fs-meta);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: var(--weight-medium);
  white-space: nowrap;
}
tbody tr:last-child td { border-bottom: 0; }
td.num, th.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; text-align: right; }

/* A quote from the source. The site's strongest evidence device: the code's own words.
   No left accent bar — it is the most recognisable tell of a generated interface, and the
   citation line already does the work of marking this as quoted rather than written. */
.source {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--s-5) var(--s-6);
  margin: var(--s-6) 0;
  font-size: var(--fs-small);
}
.source p { margin: 0 0 var(--s-4); max-width: none; }
.source p:last-child { margin-bottom: 0; }
.source cite {
  display: block;
  margin-top: var(--s-4);
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  font-style: normal;
  color: var(--text-muted);
}

pre {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--s-5) var(--s-6);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  line-height: 1.6;
  margin: var(--s-6) 0;
}
pre code { background: none; border: 0; padding: 0; }
.tok-k { color: var(--syntax-keyword); }
.tok-t { color: var(--syntax-type); }
.tok-c { color: var(--syntax-comment); }
.tok-s { color: var(--syntax-string); }

ul.plain { list-style: none; padding: 0; margin: var(--s-5) 0; max-width: var(--measure); }
ul.plain li {
  padding: var(--s-3) 0 var(--s-3) var(--s-6);
  border-bottom: 1px solid var(--border);
  position: relative;
}
ul.plain li:last-child { border-bottom: 0; }
ul.plain li::before {
  content: "";
  position: absolute;
  left: 0; top: 1.05em;
  width: var(--s-4); height: 1px;
  background: var(--accent);
}

/* ---------------------------------------------------------------- diagram */

figure { margin: var(--s-8) 0; }
figure svg { display: block; width: 100%; height: auto; }
figcaption {
  font-size: var(--fs-meta);
  color: var(--text-muted);
  margin-top: var(--s-4);
  max-width: var(--measure);
}

.diagram {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--r-island);
  padding: var(--s-6);
  overflow-x: auto;
}

/* ---------------------------------------------------------------- interactive */

.demo { margin: var(--s-8) 0; }

.demo__controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-5);
  align-items: flex-end;
  padding-bottom: var(--s-5);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--s-6);
}

.field { display: flex; flex-direction: column; gap: var(--s-2); }
.field label { font-size: var(--fs-meta); color: var(--text-muted); letter-spacing: 0.04em; }
.field input[type="range"] { width: 190px; accent-color: var(--accent); }
.field output { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--text); font-size: var(--fs-small); }

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: var(--r-md); overflow: hidden; flex-wrap: wrap; }
.seg button {
  appearance: none;
  background: var(--surface-sunken);
  border: 0;
  border-right: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: var(--fs-small);
  padding: var(--s-3) var(--s-5);
  cursor: pointer;
  transition: background var(--motion-fast) var(--ease), color var(--motion-fast) var(--ease);
}
.seg button:last-child { border-right: 0; }
.seg button:hover { color: var(--text); background: var(--surface-raised); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-contrast); font-weight: var(--weight-medium); }

.toggle { display: inline-flex; align-items: center; gap: var(--s-3); font-size: var(--fs-small); color: var(--text-muted); cursor: pointer; }
.toggle input { accent-color: var(--accent); width: 15px; height: 15px; }

textarea {
  width: 100%;
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  padding: var(--s-5);
  resize: vertical;
  min-height: 76px;
}
textarea:focus-visible { border-color: var(--accent); }

/* The surface viewport — the site's one piece of theatre, and it is a real one:
   the SAME node rendered through different surface kinds. */
.viewport {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  min-height: 268px;
  padding: var(--s-6);
  font-size: var(--fs-small);
}
.viewport h4 {
  margin: 0 0 var(--s-5);
  font-size: var(--fs-meta);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: var(--weight-normal);
}
.viewport h5 {
  margin: 0 0 var(--s-5);
  font-size: var(--fs-meta);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: var(--weight-normal);
}
.viewport dl { display: grid; grid-template-columns: max-content 1fr; gap: var(--s-3) var(--s-6); margin: 0; }
.viewport dt { color: var(--text-muted); font-size: var(--fs-meta); }
.viewport dd { margin: 0; font-family: var(--font-mono); font-size: var(--fs-meta); }

.tree { font-family: var(--font-mono); font-size: var(--fs-meta); line-height: 1.9; white-space: pre; color: var(--text-muted); }
.tree b { color: var(--text); font-weight: var(--weight-normal); }

.bar {
  height: 6px;
  background: var(--surface);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
/* Scaled, not resized: animating width thrashes layout on every frame, and this bar redraws on
   every slider input. transform-origin puts the growth on the left, where a meter grows. */
.bar i {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--accent);
  transform-origin: left center;
  transition: transform var(--motion-base) var(--ease);
}
.bar i.is-advisory { background: var(--inferred); }

.verdict {
  font-family: var(--font-mono);
  font-size: var(--fs-head);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.verdict.is-blocked { color: var(--danger); }
.verdict.is-partial { color: var(--inferred); }

.notice {
  border: 1px solid rgba(216, 166, 80, 0.36);
  background: rgba(216, 166, 80, 0.07);
  border-radius: var(--r-md);
  padding: var(--s-5) var(--s-6);
  font-size: var(--fs-small);
  margin: var(--s-6) 0;
}
.notice strong { color: var(--inferred); }

.notice--danger { border-color: rgba(224, 122, 111, 0.36); background: rgba(224, 122, 111, 0.07); }
.notice--danger strong { color: var(--danger); }

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

.foot {
  border-top: 1px solid var(--border);
  margin-top: var(--s-10);
  padding: var(--s-8) 0 var(--s-9);
  color: var(--text-muted);
  font-size: var(--fs-small);
}
.foot .cols { display: grid; gap: var(--s-7); grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
.foot h2 { font-size: var(--fs-meta); text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-muted); margin: 0 0 var(--s-4); font-weight: var(--weight-medium); }
.foot ul { list-style: none; margin: 0; padding: 0; }
.foot li { margin-bottom: var(--s-3); }
.foot a { color: var(--text); text-decoration: none; }
.foot a:hover { color: var(--accent); text-decoration: underline; }
.foot .colophon { margin-top: var(--s-8); padding-top: var(--s-6); border-top: 1px solid var(--border); font-size: var(--fs-meta); max-width: var(--measure); }

@media (max-width: 720px) {
  :root { --fs-display: 34px; --fs-title: 25px; }
  .page { padding: 0 var(--s-5); }
  .hero { padding: var(--s-8) 0 var(--s-7); }
  .panel { padding: var(--s-6); }
}