/* Hyperscale Ledger — house design language, carried over from ai-stack-field-atlas:
   deep navy ground, brass accent, warm paper ink, Fraunces display serif.
   No gradients on content, no shadow hierarchy — rules and weight do the work. */

@font-face{ font-family:"Fraunces"; src:url("fonts/fraunces-600.woff2") format("woff2");
            font-weight:600; font-style:normal; font-display:swap; }
@font-face{ font-family:"Fraunces"; src:url("fonts/fraunces-600-italic.woff2") format("woff2");
            font-weight:600; font-style:italic; font-display:swap; }

:root {
  --primary: #C9A96A;          /* brass */
  --primary-hover: #E8CD92;
  --primary-focus: #97804F;
  --on-primary: #081321;

  --ink: #F2EDE3;              /* warm paper */
  --ink-muted: #D9D3C6;
  --ink-subtle: #B4AE9F;
  --ink-tertiary: #8A8474;

  --canvas: #081321;           /* deep navy ground */
  --surface-1: #0d1c2b;
  --surface-2: #13253a;
  --surface-3: #172c44;
  --surface-4: #1b3251;

  --hairline: rgba(201,169,106,.16);
  --hairline-strong: rgba(201,169,106,.30);
  --hairline-tertiary: rgba(201,169,106,.44);

  --success: #8FAE6B;
  --warn: #C7A055;
  --alert: #b8664c;

  --r-xs: 3px;  --r-sm: 4px;  --r-md: 5px;
  --r-lg: 6px; --r-xl: 8px; --r-pill: 9999px;

  --s-xxs: 4px; --s-xs: 8px;  --s-sm: 12px; --s-md: 16px;
  --s-lg: 24px; --s-xl: 32px; --s-xxl: 48px; --s-section: 96px;

  --display: "Fraunces", "Iowan Old Style", Palatino, Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --maxw: 1180px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 15.5px;
  line-height: 1.55;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

/* ---------- type ---------- */
h1, h2, h3 { margin: 0; font-weight: 600; }
h1 { font-family: var(--display); }
h1 { font-size: 25px; line-height: 1.24; letter-spacing: -0.1px; font-weight: 600; color: var(--ink); }
h2 { font-family: var(--sans); font-size: 11.5px; line-height: 1.3; letter-spacing: .09em; font-weight: 600; text-transform: uppercase; color: var(--primary); }
h3 { font-size: 16px; line-height: 1.3; letter-spacing: -0.2px; font-weight: 500; }
p  { margin: 0 0 var(--s-sm); color: var(--ink-muted); }
a  { color: var(--primary-hover); text-decoration: none; }
a:hover { text-decoration: underline; }

.eyebrow {
  font-family: var(--sans); font-size: 11px; font-weight: 500; letter-spacing: 0.4px;
  text-transform: uppercase; color: var(--ink-subtle);
}
.sub { color: var(--ink-subtle); font-size: 13px; font-family: var(--sans); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.num  { font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: 0; }

/* ---------- shell ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--s-lg); }

header.top {
  border-bottom: 1px solid var(--hairline);
  background: var(--canvas);
  position: sticky; top: 0; z-index: 20;
}
.top-inner {
  max-width: var(--maxw); margin: 0 auto; padding: var(--s-sm) var(--s-lg);
  display: flex; align-items: center; gap: var(--s-md); flex-wrap: wrap;
}
.brand { display: flex; align-items: baseline; gap: var(--s-xs); margin-right: auto; }
.brand b { font-family: var(--display); font-size: 16px; font-weight: 600; letter-spacing: 0; }
.brand span { font-size: 12px; color: var(--ink-tertiary); }
.dot { width: 7px; height: 7px; border-radius: var(--r-pill); background: var(--primary); display: inline-block; }

nav.tabs { display: flex; gap: var(--s-xxs); flex-wrap: wrap; }
nav.tabs button {
  font-family: var(--sans); font-size: 13px; font-weight: 500;
  color: var(--ink-subtle); background: transparent;
  border: 1px solid transparent; border-radius: var(--r-pill);
  padding: 6px 10px; cursor: pointer; transition: color .12s; border-radius: 0;
}
nav.tabs button:hover { color: var(--ink); }
nav.tabs button[aria-selected="true"] { background: transparent; color: var(--ink); box-shadow: inset 0 -1.5px 0 var(--primary); border-radius: 0; }

.hero { padding: var(--s-lg) 0 var(--s-md); border-bottom: 1px solid var(--hairline); }
.hero p.lede { font-size: 13.5px; line-height: 1.55; max-width: 82ch; margin-top: var(--s-xs); color: var(--ink-subtle); }

main { padding: var(--s-xl) 0 var(--s-section); }
section.view[hidden] { display: none; }
.stack > * + * { margin-top: var(--s-xl); }

/* ---------- panels ---------- */
.panel {
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--r-xs);
  padding: var(--s-md) var(--s-md) var(--s-lg);
}
.panel > h2 { margin-bottom: var(--s-xxs); }
.panel > .sub { margin-bottom: var(--s-md); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-md); }
.model-cols { display: grid; grid-template-columns: 330px 1fr; gap: var(--s-lg); align-items: start; }

/* ---------- stat tiles ---------- */
.tile {
  background: transparent; border: none; border-top: 1px solid var(--hairline-strong);
  border-radius: 0; padding: var(--s-xs) 0 var(--s-sm);
}
.tile .k { font-family: var(--sans); font-size: 11.5px; color: var(--ink-subtle); letter-spacing: 0.2px; }
.tile .v {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 19px; font-weight: 400; letter-spacing: -0.3px; margin-top: 3px;
  line-height: 1.15;
}
.tile .d { font-size: 11px; color: var(--ink-tertiary); margin-top: 5px; }
.tile.accent { border-top-color: var(--primary); }
.tile.accent .v { color: var(--primary-hover); }

/* ---------- controls ---------- */
.ctl { margin-bottom: var(--s-md); }
.ctl-head { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s-xs); }
.ctl-head label { font-family: var(--sans); font-size: 12.5px; color: var(--ink-muted); }
.ctl-head .val {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: 13px; color: var(--ink);
  background: var(--surface-3); border: 1px solid var(--hairline);
  border-radius: var(--r-xs); padding: 1px 7px;
}
.ctl .note { font-family: var(--sans); font-size: 11px; color: var(--ink-tertiary); margin-top: 4px; }

input[type=range] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 22px; background: transparent; margin-top: 7px; cursor: pointer;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 3px; background: var(--hairline-strong); border-radius: var(--r-pill);
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 14px; height: 14px; border-radius: var(--r-pill);
  background: var(--ink); border: none; margin-top: -5.5px;
  transition: background .12s;
}
input[type=range]:hover::-webkit-slider-thumb { background: var(--primary); }
input[type=range]:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px rgba(201,169,106,.32); }
input[type=range]::-moz-range-track { height: 3px; background: var(--hairline-strong); border-radius: var(--r-pill); }
input[type=range]::-moz-range-thumb { width: 14px; height: 14px; border: none; border-radius: var(--r-pill); background: var(--ink); }

button.btn {
  font-family: var(--sans); font-size: 14px; font-weight: 500;
  background: var(--surface-2); color: var(--ink);
  border: 1px solid var(--hairline); border-radius: var(--r-md);
  padding: 8px 14px; cursor: pointer;
}
button.btn:hover { border-color: var(--hairline-tertiary); }
button.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--on-primary); }
button.btn.primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }

input[type=text], select {
  font-family: var(--mono); font-size: 13px;
  background: var(--surface-1); color: var(--ink);
  border: 1px solid var(--hairline); border-radius: var(--r-md);
  padding: 9px 12px; width: 100%;
}
input[type=text]:focus, select:focus {
  outline: none; border-color: var(--primary-focus);
  box-shadow: 0 0 0 3px rgba(201,169,106,.22);
}

/* ---------- tables ---------- */
.tbl-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  font-family: var(--sans); text-align: left; font-size: 10.5px; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.4px; color: var(--ink-subtle);
  border-bottom: 1px solid var(--hairline-strong); padding: 8px 10px; white-space: nowrap;
}
td {
  padding: 9px 10px; border-bottom: 1px solid var(--hairline);
  color: var(--ink-muted); vertical-align: top;
}
tbody tr:hover td { background: var(--surface-2); }
td.n, th.n { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
td strong { color: var(--ink); font-weight: 500; }

/* ---------- confidence tags ---------- */
.tag {
  display: inline-block; font-family: var(--mono); font-size: 10px;
  border-radius: var(--r-xs); padding: 1px 5px; border: 1px solid var(--hairline-strong);
  color: var(--ink-subtle); background: var(--surface-3); white-space: nowrap;
}
.tag.f { color: var(--success); border-color: rgba(143,174,107,.42); }
.tag.r { color: var(--warn);    border-color: rgba(199,160,85,.42); }
.tag.t { color: var(--primary-hover); border-color: rgba(201,169,106,.45); }
.tag.null { color: var(--ink-tertiary); }

/* ---------- callout ---------- */
/* Emphasis comes from the surface ladder + hairline, per the Linear system —
   not from a chromatic side bar. Lifted one step above the panel it sits in. */
.callout {
  background: var(--surface-2);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  padding: var(--s-md);
}
.callout.alert { border-color: rgba(184,102,76,.45); }
.callout p:last-child { margin-bottom: 0; }

/* ---------- chart ---------- */
.chart { width: 100%; height: auto; display: block; }
.chart text { font-family: var(--mono); font-size: 10px; fill: var(--ink-subtle); }
.chart .axis { stroke: var(--hairline-strong); stroke-width: 1; }
.chart .grid { stroke: var(--hairline); stroke-width: 1; }
.chart .ln  { fill: none; stroke-width: 2; }
.chart .pt  { stroke: var(--canvas); stroke-width: 1.5; }

.legend { display: flex; gap: var(--s-md); flex-wrap: wrap; font-size: 12px; color: var(--ink-subtle); margin-top: var(--s-sm); }
.legend i { width: 9px; height: 9px; border-radius: 2px; display: inline-block; margin-right: 6px; }

/* ---------- misc ---------- */
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px var(--s-sm); font-size: 12px; }
.kv dt { color: var(--ink-tertiary); }
.kv dd { margin: 0; color: var(--ink-muted); font-family: var(--mono); }

footer.foot {
  border-top: 1px solid var(--hairline); padding: var(--s-xl) 0 var(--s-xxl);
  color: var(--ink-tertiary); font-size: 12px;
}
footer.foot a { color: var(--ink-subtle); }

.err { color: var(--alert); font-size: 13px; }

@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4, .model-cols { grid-template-columns: 1fr; }
  h1 { font-size: 30px; letter-spacing: -0.7px; }
  .hero { padding: var(--s-xl) 0 var(--s-lg); }
}

/* ---------- campus: the hero visual, rendered from the model ---------- */
.campus {
  border: 1px solid var(--hairline);
  border-radius: var(--r-xs);
  padding: var(--s-md);
  background:
    radial-gradient(120% 180% at 50% -40%, rgba(201,169,106,.10), transparent 62%),
    var(--canvas);
  overflow: hidden;
}
.campus-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: var(--s-md); margin-bottom: var(--s-sm); flex-wrap: wrap;
}
.campus-head .t {
  font-size: 11px; text-transform: uppercase; letter-spacing: .5px;
  color: var(--ink-subtle); font-weight: 500;
}
.campus-head .r {
  font-family: var(--mono); font-size: 11px; color: var(--ink-tertiary);
  font-variant-numeric: tabular-nums;
}
.campus svg { display: block; width: 100%; height: auto; }

/* each glyph is a rack unit; the sweep reads as power moving through the hall */
.campus .u { fill: var(--hairline-strong); }
.campus .u.on {
  fill: var(--primary);
  animation: pulse 3.4s ease-in-out infinite;
}
.campus .u.edge { fill: var(--primary-hover); }
@keyframes pulse {
  0%, 72%, 100% { opacity: .34; }
  36%           { opacity: 1;   }
}
@media (prefers-reduced-motion: reduce) {
  .campus .u.on { animation: none; opacity: .62; }
}

/* ---------- campus canvas ---------- */
.campus canvas {
  display: block; width: 100%; height: 400px;
  cursor: grab; touch-action: none;
}
.campus canvas:active { cursor: grabbing; }
.campus-hint {
  font-family: var(--sans); font-size: 10.5px; letter-spacing: .04em;
  color: var(--ink-tertiary); text-transform: uppercase;
  text-align: center; margin-top: 6px;
}

/* ---------- glossary ---------- */
ol.gloss { list-style: none; margin: var(--s-md) 0 0; padding: 0; }
.g { display: grid; grid-template-columns: 44px 1fr; gap: var(--s-md);
     padding: var(--s-md) 0; border-top: 1px solid var(--hairline); }
.g:first-child { border-top: 1px solid var(--hairline-strong); }
.g-n { font-family: var(--display); font-size: 22px; color: var(--primary); line-height: 1; padding-top: 2px; }
.g-head { display: flex; align-items: baseline; gap: var(--s-xs); flex-wrap: wrap; margin-bottom: 4px; }
.g-head h3 { font-family: var(--display); font-size: 17px; font-weight: 600; color: var(--ink); }
.g-go { font-family: var(--sans); font-size: 11.5px; margin-left: auto; color: var(--ink-subtle); }
.g-go:hover { color: var(--primary-hover); text-decoration: none; }
.g-what { color: var(--ink-muted); margin-bottom: 6px; }
.g-hook { color: var(--ink-subtle); font-size: 14px; margin: 0; }
.g-lbl { font-family: var(--sans); font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase;
         color: var(--primary); margin-right: 8px; }
@media (max-width: 640px) { .g { grid-template-columns: 30px 1fr; } .g-n { font-size: 17px; } }