/* EDU-AI · AI Atlas — a distinct member of the EDU-* collection.
   Same 1970s dark-steel console as the siblings: engraved labels, amber
   keycaps — but here the screens glow cyan-phosphor, like a radar scanning
   the modern AI landscape. Violet is reserved for "PRO" depth and for the
   experts of the MoE animation. */

:root {
  --chassis: #1c2128;
  --chassis-deep: #14181d;
  --panel: #222831;
  --panel-2: #2a313b;
  --panel-edge: #3a434e;
  --ink: #cdd9e5;
  --ink-soft: #8b98a5;
  --amber: #e3b341;
  --amber-dark: #b8862a;
  --screen: #06141a;
  --screen-2: #081b22;
  --screen-edge: #030a0d;
  --screen-grid: rgb(90 215 230 / 0.10);
  --phosphor: #5ad7e6;
  --phosphor-dim: #3a96a3;
  --phosphor-soft: #aef0f8;
  --violet: #c9a0dc;
  --violet-dim: #8f6aa5;
  --pass: #57e389;
  --fail: #f0663f;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: "Avenir Next", "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

html { scroll-behavior: smooth; scroll-padding-top: 6.5rem; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(ellipse at 20% -10%, #262d36 0%, var(--chassis) 55%, var(--chassis-deep) 100%);
  min-height: 100vh;
}

button { font: inherit; cursor: pointer; }
a { color: var(--phosphor); }
code, .mono { font-family: var(--mono); }

/* ---------- header ---------- */

.top {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.7rem 1.2rem; flex-wrap: wrap;
  border-bottom: 2px solid var(--panel-edge);
  background: linear-gradient(#20262e, #1a1f26);
  box-shadow: 0 4px 14px rgb(0 0 0 / 0.35);
}
.brand { display: flex; align-items: center; gap: 0.75rem; }
.brand-mark {
  font-family: var(--mono); font-weight: 700; font-size: 0.85rem;
  color: var(--screen); background: var(--phosphor); border-radius: 6px;
  padding: 0.45rem 0.5rem; letter-spacing: 0.02em;
  box-shadow: 0 0 10px rgb(90 215 230 / 0.4), inset 0 -2px 0 rgb(0 0 0 / 0.25);
}
.brand-text h1 { font-family: var(--mono); font-size: 1.15rem; letter-spacing: 0.06em; line-height: 1.1; color: var(--ink); }
.brand-sub { font-size: 0.62rem; letter-spacing: 0.3em; color: var(--ink-soft); font-weight: 600; vertical-align: 0.15em; }
.brand-tag { font-size: 0.72rem; color: var(--ink-soft); font-style: italic; }
.top-nav { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }

.lang-switch, .depth-switch { display: flex; border: 1px solid var(--panel-edge); border-radius: 6px; overflow: hidden; }
.lang-switch button, .depth-switch button {
  border: 0; background: var(--panel); color: var(--ink-soft);
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.08em; padding: 0.35rem 0.55rem;
}
.lang-switch button.active { background: var(--phosphor); color: var(--screen); }
.depth-switch button.active { background: var(--violet); color: var(--screen); }

/* ---------- table of contents chips ---------- */

.toc {
  position: sticky; top: 3.6rem; z-index: 40;
  display: flex; gap: 0.4rem; padding: 0.5rem 1.2rem; flex-wrap: wrap;
  background: linear-gradient(rgb(26 31 38 / 0.97), rgb(26 31 38 / 0.92));
  border-bottom: 1px solid var(--panel-edge);
}
.toc a {
  display: inline-flex; align-items: center; gap: 0.32rem;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.05em;
  color: var(--ink-soft); text-decoration: none;
  border: 1px solid var(--panel-edge); border-radius: 999px;
  padding: 0.22rem 0.6rem; background: var(--panel);
  transition: color 120ms, border-color 120ms, box-shadow 120ms;
}
.toc a .ti { font-size: 0.78rem; line-height: 1; filter: saturate(0.55); transition: filter 120ms; }
.toc a .tnum { font-size: 0.58rem; font-weight: 700; color: var(--phosphor-dim); }
.toc a:hover { color: var(--phosphor); border-color: var(--phosphor-dim); }
.toc a:hover .ti { filter: none; }
.toc a.current .ti { filter: none; }
.toc a.current .tnum { color: inherit; opacity: 0.75; }

/* ---------- page & modules ---------- */

.page { max-width: 60rem; margin: 0 auto; padding: 1.5rem 1.2rem 4rem; }

.module { margin: 3.2rem 0; }
.module-eyebrow {
  font-family: var(--mono); font-size: 0.66rem; font-weight: 700;
  letter-spacing: 0.28em; text-transform: uppercase; color: var(--phosphor-dim);
}
.module h2 { font-size: 1.55rem; margin: 0.35rem 0 0.7rem; letter-spacing: 0.01em; }
.lead { color: var(--ink); line-height: 1.62; max-width: 46rem; margin-bottom: 1.1rem; }
.lead b, .probox b { color: var(--phosphor-soft); }
.note { font-size: 0.75rem; color: var(--ink-soft); font-style: italic; margin-top: 0.6rem; }

/* engraved cards */
.card {
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 10px;
  box-shadow: 0 1px 0 rgb(255 255 255 / 0.03) inset, 0 6px 14px rgb(0 0 0 / 0.25);
  padding: 0.8rem 0.9rem 0.9rem; margin-top: 0.9rem;
}
.card-title {
  font-size: 0.62rem; font-weight: 700; letter-spacing: 0.26em; text-transform: uppercase;
  color: var(--ink-soft); display: block; margin-bottom: 0.55rem;
}

/* phosphor screens */
.screen {
  background:
    repeating-linear-gradient(0deg, transparent 0 2px, rgb(0 0 0 / 0.12) 2px 3px),
    linear-gradient(var(--screen-2), var(--screen));
  border: 1px solid var(--screen-edge); border-radius: 8px;
  box-shadow: inset 0 0 26px rgb(0 0 0 / 0.55), inset 0 0 6px rgb(90 215 230 / 0.12);
  padding: 0.9rem; color: var(--phosphor); font-family: var(--mono);
}

/* PRO depth boxes */
.probox {
  display: none;
  border-left: 3px solid var(--violet); border-radius: 0 8px 8px 0;
  background: rgb(201 160 220 / 0.07);
  padding: 0.75rem 0.9rem; margin-top: 0.9rem;
  font-size: 0.86rem; line-height: 1.6; color: var(--ink);
}
.probox::before {
  content: "PRO"; display: inline-block;
  font-family: var(--mono); font-size: 0.6rem; font-weight: 700; letter-spacing: 0.2em;
  color: var(--screen); background: var(--violet); border-radius: 4px;
  padding: 0.1rem 0.4rem; margin: 0 0.5rem 0.2rem 0;
}
body.pro .probox { display: block; }
.probox code { color: var(--violet); font-size: 0.82em; }

/* keycap buttons */
.btn {
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.06em; color: var(--ink);
  background: linear-gradient(#2f3742, #262d36); border: 1px solid var(--panel-edge);
  border-radius: 7px; padding: 0.42rem 0.85rem;
  box-shadow: 0 2px 0 #12161b, 0 3px 4px rgb(0 0 0 / 0.25);
  transition: transform 60ms, box-shadow 60ms;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { transform: translateY(2px); box-shadow: 0 0 0 #12161b; }
.btn:disabled { opacity: 0.4; cursor: default; transform: none; }
.btn-primary {
  color: var(--screen); background: linear-gradient(#f0c65a, var(--amber));
  border-color: var(--amber-dark);
  box-shadow: 0 2px 0 var(--amber-dark), 0 3px 6px rgb(227 179 65 / 0.25);
}
:focus-visible { outline: 2px solid var(--amber); outline-offset: 2px; }

/* generic control rows */
.controls { display: flex; align-items: center; gap: 0.8rem; flex-wrap: wrap; margin-top: 0.7rem; }
.controls label { font-size: 0.75rem; color: var(--ink-soft); display: flex; align-items: center; gap: 0.5rem; max-width: 100%; }
.controls label select { flex: 1; min-width: 0; }
input[type="range"] { accent-color: var(--amber); }
select {
  font: inherit; font-size: 0.8rem; color: var(--ink);
  background: var(--panel-2); border: 1px solid var(--panel-edge); border-radius: 6px;
  padding: 0.3rem 0.4rem;
}

/* ---------- 01 next-token demo ---------- */

.nt-sentence { font-size: 1.05rem; line-height: 1.9; min-height: 2.2rem; }
.nt-tok {
  display: inline-block; border: 1px solid var(--phosphor-dim); border-radius: 5px;
  padding: 0.05rem 0.4rem; margin: 0 0.14rem;
  background: rgb(90 215 230 / 0.06);
}
.nt-tok.nt-new { background: rgb(227 179 65 / 0.18); border-color: var(--amber); color: var(--amber); }
.nt-cursor { display: inline-block; width: 0.6em; animation: blink 1s steps(1) infinite; color: var(--phosphor-soft); }
@keyframes blink { 50% { opacity: 0; } }

.nt-bars { margin-top: 0.9rem; display: grid; gap: 0.35rem; }
.nt-bar { display: grid; grid-template-columns: 7.5rem 1fr 3.2rem; align-items: center; gap: 0.6rem; font-size: 0.8rem; }
.nt-bar .w { color: var(--phosphor-soft); text-align: right; overflow: hidden; text-overflow: ellipsis; }
.nt-bar .track { display: block; background: rgb(90 215 230 / 0.08); border-radius: 4px; height: 0.85rem; overflow: hidden; }
.nt-bar .fill { display: block; height: 100%; background: linear-gradient(90deg, var(--phosphor-dim), var(--phosphor)); border-radius: 4px; transition: width 300ms; }
.nt-bar .p { color: var(--ink-soft); font-size: 0.72rem; }
.nt-bar.best .fill { background: linear-gradient(90deg, var(--amber-dark), var(--amber)); }
.nt-bar.best .w { color: var(--amber); }

/* ---------- 01b attention demo ---------- */

.attn-stream { line-height: 2.6; font-size: 0.95rem; padding-top: 0.5rem; }
.attn-tok {
  display: inline-block; position: relative;
  border: 1px solid var(--phosphor-dim); border-radius: 5px;
  padding: 0.05rem 0.42rem; margin: 0 0.14rem;
  background: rgb(90 215 230 / 0.06); color: var(--phosphor);
}
.attn-tok.focusable { border-style: dashed; border-color: var(--amber); cursor: pointer; }
.attn-tok.focusable:hover { background: rgb(227 179 65 / 0.12); }
.attn-tok.sel { background: var(--amber); border-color: var(--amber); color: var(--screen); font-weight: 700; }
.attn-tok.att { color: var(--phosphor-soft); }
.attn-tok.dim { opacity: 0.35; }
.attn-w {
  position: absolute; top: -1.15rem; left: 50%; transform: translateX(-50%);
  font-family: var(--mono); font-size: 0.58rem; color: var(--amber); white-space: nowrap;
}
.attn-cap {
  margin-top: 0.8rem; min-height: 2.4rem;
  font-family: var(--sans); font-size: 0.78rem; line-height: 1.55; color: var(--ink-soft);
}

/* ---------- 02 parameters slider ---------- */

.par-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem; margin-top: 0.8rem; }
.par-size { font-size: 2.4rem; font-weight: 700; color: var(--phosphor-soft); line-height: 1; }
.par-size small { font-size: 0.85rem; color: var(--phosphor-dim); font-weight: 600; letter-spacing: 0.05em; }
.par-hw { font-size: 1.6rem; }
.par-kv { display: grid; grid-template-columns: auto 1fr; gap: 0.25rem 0.8rem; font-size: 0.8rem; margin-top: 0.6rem; }
.par-kv dt { color: var(--ink-soft); }
.par-kv dd { color: var(--phosphor-soft); }
.par-desc { font-size: 0.85rem; line-height: 1.55; color: var(--ink); font-family: var(--sans); }
.par-models { margin-top: 0.5rem; display: flex; flex-wrap: wrap; gap: 0.3rem; }
.par-models span {
  font-family: var(--mono); font-size: 0.68rem; color: var(--phosphor);
  border: 1px solid var(--phosphor-dim); border-radius: 999px; padding: 0.1rem 0.5rem;
}

/* ---------- 03 MoE ---------- */

.moe-wrap { display: grid; grid-template-columns: 1fr auto; gap: 0.9rem; align-items: start; }
.moe-svg { width: 100%; height: auto; display: block; }
.moe-stats { font-size: 0.78rem; display: grid; gap: 0.4rem; min-width: 11rem; }
.moe-stats .v { color: var(--amber); font-size: 1.05rem; font-weight: 700; }
.moe-stats .k { color: var(--ink-soft); }
.moe-expert { fill: var(--panel-2); stroke: var(--panel-edge); }
.moe-expert.on { fill: rgb(201 160 220 / 0.35); stroke: var(--violet); }
.moe-expert-label { fill: var(--ink-soft); font-family: var(--mono); font-size: 10px; }
.moe-token-text { fill: var(--screen); font-family: var(--mono); font-size: 10px; font-weight: 700; }
.moe-router { fill: var(--panel-2); stroke: var(--phosphor-dim); }
.moe-wire { stroke: var(--panel-edge); stroke-width: 1; }
.moe-wire.on { stroke: var(--violet); stroke-width: 2; }

/* ---------- 04 capabilities ---------- */

.caps-tabs { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-top: 0.9rem; }
.caps-tabs .btn.active { color: var(--screen); background: linear-gradient(#7ee4f0, var(--phosphor)); border-color: var(--phosphor-dim); }
.caps-panel { margin-top: 0.8rem; }
.caps-expl { font-size: 0.88rem; line-height: 1.6; margin-bottom: 0.8rem; max-width: 46rem; }

/* vision */
.vis-stage { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.vis-patches { display: grid; grid-template-columns: repeat(6, 34px); gap: 4px; }
.vis-patches svg { border: 1px solid var(--phosphor-dim); border-radius: 4px; opacity: 0; transform: scale(0.6); transition: opacity 350ms, transform 350ms; }
.vis-patches.shown svg { opacity: 1; transform: none; }
.vis-tokens { margin-top: 0.7rem; font-size: 0.78rem; line-height: 2; }

/* chat (tools + thinking) */
.chat { display: grid; gap: 0.55rem; margin-top: 0.4rem; }
.bubble { max-width: 85%; border-radius: 10px; padding: 0.5rem 0.7rem; font-size: 0.8rem; line-height: 1.5; animation: pop 250ms; font-family: var(--sans); color: var(--ink); }
@keyframes pop { from { opacity: 0; transform: translateY(4px); } }
.bubble.user { justify-self: end; background: rgb(227 179 65 / 0.14); border: 1px solid var(--amber-dark); }
.bubble.ai { justify-self: start; background: rgb(90 215 230 / 0.08); border: 1px solid var(--phosphor-dim); }
.bubble.tool { justify-self: start; background: var(--panel-2); border: 1px dashed var(--panel-edge); font-family: var(--mono); font-size: 0.72rem; color: var(--ink-soft); }
.bubble.think { justify-self: start; background: rgb(201 160 220 / 0.08); border: 1px dashed var(--violet-dim); color: var(--violet); font-style: italic; }
.bubble .who { display: block; font-size: 0.6rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-soft); margin-bottom: 0.2rem; font-style: normal; }
.bubble code { font-size: 0.9em; }
.verdict-ok { color: var(--pass); font-weight: 700; }
.verdict-bad { color: var(--fail); font-weight: 700; }

.think-meter { display: flex; gap: 1.4rem; margin-top: 0.7rem; font-size: 0.72rem; color: var(--ink-soft); font-family: var(--mono); }
.think-meter b { color: var(--amber); }

/* context bars */
.ctx-rows { display: grid; gap: 0.5rem; }
.ctx-row { display: grid; grid-template-columns: 9.5rem 1fr; gap: 0.7rem; align-items: center; font-size: 0.75rem; }
.ctx-row .name { text-align: right; color: var(--phosphor-soft); }
.ctx-row .track { background: rgb(90 215 230 / 0.06); border-radius: 4px; height: 1.15rem; position: relative; }
.ctx-row .fill { position: absolute; inset: 0 auto 0 0; background: linear-gradient(90deg, var(--phosphor-dim), var(--phosphor)); border-radius: 4px; }
.ctx-row .what { position: absolute; left: 0.4rem; top: 50%; transform: translateY(-50%); white-space: nowrap; color: var(--screen); font-weight: 700; font-size: 0.68rem; mix-blend-mode: normal; }
.ctx-row .what.out { color: var(--ink-soft); }

/* ---------- 05 landscape ---------- */

.land-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: 0.8rem; margin-top: 0.9rem; }
.land-card {
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 10px;
  padding: 0.75rem 0.85rem;
  box-shadow: 0 1px 0 rgb(255 255 255 / 0.03) inset, 0 4px 10px rgb(0 0 0 / 0.2);
}
.land-card h3 { font-size: 0.95rem; display: flex; align-items: baseline; gap: 0.5rem; flex-wrap: wrap; }
.land-card .org { font-size: 0.68rem; color: var(--ink-soft); font-weight: 400; }
.land-badges { display: flex; gap: 0.3rem; flex-wrap: wrap; margin: 0.45rem 0; }
.badge {
  font-family: var(--mono); font-size: 0.62rem; font-weight: 700; letter-spacing: 0.04em;
  border-radius: 4px; padding: 0.12rem 0.4rem; border: 1px solid var(--panel-edge); color: var(--ink-soft);
}
.badge.open { color: var(--pass); border-color: var(--pass); }
.badge.closed { color: var(--fail); border-color: var(--fail); }
.badge.moe { color: var(--violet); border-color: var(--violet-dim); }
.badge.cap { color: var(--phosphor); border-color: var(--phosphor-dim); }
.land-card p { font-size: 0.76rem; line-height: 1.5; color: var(--ink); }

/* ---------- 06 local calculator ---------- */

.calc-row { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 0.4rem; }
.calc-out { margin-top: 0.9rem; font-size: 0.85rem; }
.calc-out .big { font-size: 1.7rem; font-weight: 700; color: var(--phosphor-soft); }
.calc-verdict { margin-top: 0.4rem; font-weight: 700; }
.calc-note { font-size: 0.74rem; color: var(--ink-soft); margin-top: 0.5rem; font-family: var(--sans); }

/* ---------- 07 toolbox ---------- */

.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); gap: 0.8rem; margin-top: 0.9rem; }
.tool-card { background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 10px; padding: 0.75rem 0.85rem; }
.tool-card h3 { font-size: 0.95rem; display: flex; gap: 0.45rem; align-items: baseline; }
.tool-card .kind { font-size: 0.62rem; color: var(--ink-soft); letter-spacing: 0.15em; text-transform: uppercase; }
.tool-card p { font-size: 0.78rem; line-height: 1.55; margin: 0.45rem 0; }
.tool-card pre {
  background: var(--screen); border: 1px solid var(--screen-edge); border-radius: 6px;
  color: var(--phosphor); font-size: 0.68rem; padding: 0.5rem 0.6rem; overflow-x: auto;
  line-height: 1.6;
}
.path-steps { counter-reset: step; display: grid; gap: 0.55rem; margin-top: 0.9rem; }
.path-steps li {
  list-style: none; counter-increment: step; position: relative;
  padding: 0.55rem 0.8rem 0.55rem 2.6rem; font-size: 0.85rem; line-height: 1.5;
  background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 8px;
}
.path-steps li::before {
  content: counter(step); position: absolute; left: 0.7rem; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-weight: 700; color: var(--screen);
  background: var(--amber); border-radius: 5px; width: 1.35rem; height: 1.35rem;
  display: grid; place-items: center; font-size: 0.75rem;
}

/* ---------- 08 glossary ---------- */

.gloss-search { width: 100%; margin-top: 0.8rem; font: inherit; font-size: 0.9rem;
  color: var(--ink); background: var(--panel-2); border: 1px solid var(--panel-edge);
  border-radius: 8px; padding: 0.55rem 0.8rem; }
.gloss-search::placeholder { color: var(--ink-soft); }
.gloss-list { margin-top: 0.8rem; display: grid; gap: 0.5rem; }
.gloss-item { background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 8px; padding: 0.55rem 0.8rem; }
.gloss-item dt { font-family: var(--mono); font-size: 0.82rem; font-weight: 700; color: var(--phosphor); }
.gloss-item dd { font-size: 0.8rem; line-height: 1.55; margin-top: 0.25rem; }
.gloss-item .pro-line { display: none; margin-top: 0.3rem; color: var(--violet); font-size: 0.76rem; }
body.pro .gloss-item .pro-line { display: block; }

/* ---------- paged navigation ---------- */

body.paged .module { display: none; margin: 1.8rem 0 0; }
body.paged .module.current { display: block; }
.snapshot-note {
  font-size: 0.74rem; color: var(--ink-soft); font-style: italic;
  border: 1px dashed var(--panel-edge); border-radius: 8px;
  padding: 0.45rem 0.8rem; margin-top: 0.4rem;
}
.snapshot-note b { color: var(--amber); }
.toc a.current { background: var(--phosphor); color: var(--screen); border-color: var(--phosphor-dim); font-weight: 700; }
.pager { border-top: 1px solid var(--panel-edge); margin-top: 2.4rem; padding-top: 1.1rem; }
.pager-track {
  height: 3px; border-radius: 2px; overflow: hidden;
  background: var(--panel); margin-bottom: 0.95rem;
}
.pager-fill {
  display: block; height: 100%; border-radius: 2px;
  background: linear-gradient(90deg, var(--phosphor-dim), var(--phosphor));
  box-shadow: 0 0 6px rgb(90 215 230 / 0.5);
  transition: width 300ms;
}
.pager-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.pager .pos { font-size: 0.78rem; letter-spacing: 0.2em; color: var(--ink-soft); flex: none; }
.pager-btn { display: inline-flex; align-items: center; gap: 0.5rem; max-width: 38%; min-width: 0; }
.pager-btn .dir { flex: none; }
.pager-btn .dest {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.04em;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
@media (max-width: 42rem) { .pager-btn .dest { display: none; } .pager-btn { max-width: none; } }

/* ---------- glossary tooltips ---------- */

.gloss-ref {
  border-bottom: 1px dotted var(--phosphor-dim);
  cursor: help; text-decoration: none;
}
.gloss-ref:hover, .gloss-ref:focus-visible { color: var(--phosphor-soft); border-bottom-color: var(--phosphor); }
#tipBox {
  position: fixed; z-index: 100; max-width: 300px;
  background: var(--panel-2); border: 1px solid var(--phosphor-dim); border-radius: 8px;
  box-shadow: 0 8px 22px rgb(0 0 0 / 0.5);
  padding: 0.55rem 0.7rem; font-size: 0.76rem; line-height: 1.5; color: var(--ink);
  pointer-events: none;
}
#tipBox .tip-term {
  display: block; font-family: var(--mono); font-size: 0.72rem; font-weight: 700;
  color: var(--phosphor); margin-bottom: 0.2rem;
}
#tipBox .tip-pro { display: none; margin-top: 0.3rem; color: var(--violet); font-size: 0.72rem; }
body.pro #tipBox .tip-pro { display: block; }

/* ---------- quantization close-up ---------- */

.quant-slider { display: flex; align-items: center; gap: 0.8rem; font-size: 0.75rem; color: var(--phosphor-dim); flex-wrap: wrap; }
.quant-slider input { flex: 1; min-width: 10rem; }
.quant-slider .mono { color: var(--phosphor-soft); font-size: 0.85rem; }
.quant-rows { display: grid; gap: 0.55rem; margin-top: 0.9rem; }
.quant-row {
  display: grid; grid-template-columns: 1.2fr 1fr 1.3fr; gap: 0.8rem; align-items: center;
  border-top: 1px solid rgb(90 215 230 / 0.12); padding-top: 0.5rem; font-size: 0.78rem;
}
.quant-row .k { color: var(--phosphor-dim); font-size: 0.62rem; letter-spacing: 0.15em; text-transform: uppercase; }
.qf-name { font-weight: 700; color: var(--phosphor-soft); font-size: 0.95rem; }
.qf-bits { color: var(--amber); font-size: 0.72rem; margin-left: 0.25rem; }
.qf-meta { display: block; color: var(--ink-soft); font-family: var(--sans); font-size: 0.68rem; margin-top: 0.15rem; }
.qe { display: grid; grid-template-columns: auto 1fr auto; gap: 0.5rem; align-items: center; }
.qe .track { display: block; background: rgb(240 102 63 / 0.12); border-radius: 4px; height: 0.7rem; overflow: hidden; }
.qe .fill { display: block; height: 100%; background: linear-gradient(90deg, var(--amber-dark), var(--fail)); border-radius: 4px; transition: width 200ms; }
.qe-val { font-size: 0.7rem; color: var(--ink-soft); min-width: 4.5rem; text-align: right; }

/* ---------- 02 toy tokenizer ---------- */

.tok-input {
  width: 100%; font: inherit; font-size: 0.95rem; color: var(--ink);
  background: var(--panel-2); border: 1px solid var(--panel-edge);
  border-radius: 8px; padding: 0.55rem 0.8rem; resize: vertical;
}
.tok-chips { line-height: 2.15; font-size: 0.85rem; min-height: 2.3rem; }
.tk { display: inline-block; border: 1px solid; border-radius: 5px; padding: 0.02rem 0.34rem; margin: 0 0.1rem; white-space: pre; }
.tk.c0 { color: var(--phosphor); border-color: var(--phosphor-dim); background: rgb(90 215 230 / 0.07); }
.tk.c1 { color: var(--amber); border-color: var(--amber-dark); background: rgb(227 179 65 / 0.08); }
.tk.c2 { color: var(--violet); border-color: var(--violet-dim); background: rgb(201 160 220 / 0.08); }
.tok-stats { margin-top: 0.7rem; display: flex; gap: 1.3rem; flex-wrap: wrap; font-size: 0.72rem; color: var(--phosphor-dim); }
.tok-stats b { color: var(--amber); font-size: 0.95rem; }

/* ---------- 04 birth of a model ---------- */

.birth-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 0.8rem; margin-top: 0.8rem; }

/* ---------- 07 hallucination quiz ---------- */

.quiz-reveal {
  margin-top: 0.85rem; padding-top: 0.65rem;
  border-top: 1px dashed var(--phosphor-dim);
  font-family: var(--sans); font-size: 0.82rem; line-height: 1.6; color: var(--ink);
}
.quiz-score { margin-left: auto; font-size: 0.76rem; letter-spacing: 0.18em; color: var(--ink-soft); }

/* ---------- 08 embeddings map & RAG ---------- */

.emb-svg { width: 100%; height: auto; display: block; }
.emb-pt { cursor: pointer; }
.emb-pt circle { fill: var(--panel-2); stroke-width: 1.5; transition: r 120ms; }
.emb-pt:hover circle { stroke-width: 2.5; }
.emb-pt.c0 circle { stroke: var(--phosphor); }
.emb-pt.c0 text { fill: var(--phosphor-soft); }
.emb-pt.c1 circle { stroke: var(--amber); }
.emb-pt.c1 text { fill: var(--amber); }
.emb-pt.c2 circle { stroke: var(--violet); }
.emb-pt.c2 text { fill: var(--violet); }
.emb-pt.sel circle { fill: var(--amber); stroke: var(--amber); }
.emb-pt text { font-family: var(--mono); font-size: 11px; }
.emb-line { stroke: var(--amber); stroke-width: 1.2; stroke-dasharray: 4 3; }
.emb-sim { fill: var(--amber); font-family: var(--mono); font-size: 10px; }

.rag-chunks { display: grid; gap: 0.45rem; margin-bottom: 0.8rem; }
.rag-chunk {
  display: grid; grid-template-columns: auto 1fr auto; gap: 0.6rem; align-items: center;
  font-family: var(--sans); font-size: 0.74rem; line-height: 1.45; color: var(--ink-soft);
  border: 1px dashed var(--panel-edge); border-radius: 6px; padding: 0.4rem 0.55rem;
  transition: border-color 250ms, color 250ms;
}
.rag-chunk.on { border-color: var(--pass); border-style: solid; color: var(--ink); }
.rag-id { font-family: var(--mono); font-weight: 700; color: var(--phosphor-dim); }
.rag-chunk.on .rag-id { color: var(--pass); }
.rag-score { font-family: var(--mono); font-size: 0.66rem; white-space: nowrap; color: var(--ink-soft); }
.rag-score.hi { color: var(--pass); font-weight: 700; }

/* ---------- 09 prompting ---------- */

.prompt-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.8rem; }
.prompt-box { font-size: 0.78rem; line-height: 1.6; color: var(--amber); min-height: 6rem; }

/* ---------- 10 agent loop ---------- */

.agent-loop { display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; margin: 0.2rem 0 0.8rem; }
.agent-ph {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.04em; white-space: nowrap;
  color: var(--ink-soft); border: 1px solid var(--panel-edge); border-radius: 999px;
  padding: 0.18rem 0.55rem; background: var(--panel-2);
  transition: background 150ms, color 150ms, border-color 150ms;
}
.agent-ph.on { color: var(--screen); background: var(--amber); border-color: var(--amber-dark); font-weight: 700; }
.agent-cycle {
  display: inline-flex; align-items: center; gap: 0.35rem;
  border: 1px dashed var(--violet-dim); border-radius: 999px; padding: 0.22rem 0.5rem;
}
.agent-arrow { color: var(--phosphor-dim); font-size: 0.8rem; }
.agent-iter { margin-left: auto; font-size: 0.72rem; letter-spacing: 0.15em; color: var(--amber); }

/* ---------- 11 safety & privacy ---------- */

.priv-out { display: grid; gap: 0.55rem; font-size: 0.8rem; }
.priv-row { display: grid; grid-template-columns: 11.5rem 1fr; gap: 0.7rem; align-items: baseline; }
.priv-row .k { color: var(--phosphor-dim); font-size: 0.72rem; }
.priv-row .v { font-family: var(--sans); }
.priv-row .v.ok { color: var(--pass); }
.priv-row .v.warn { color: var(--amber); }
.priv-row .v.bad { color: var(--fail); }
.priv-note {
  margin-top: 0.4rem; padding-top: 0.5rem; border-top: 1px dashed var(--panel-edge);
  font-family: var(--sans); font-size: 0.76rem; font-style: italic; color: var(--ink-soft);
}
.inj-mail { font-family: var(--sans); font-size: 0.8rem; line-height: 1.65; color: var(--ink); }
.inj-mail .who {
  display: block; font-size: 0.6rem; font-weight: 700; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink-soft); margin-bottom: 0.35rem;
}
.inj-mail .inj { border-radius: 3px; transition: background 400ms, color 400ms; }
.inj-mail.revealed .inj {
  background: rgb(240 102 63 / 0.18); color: var(--fail);
  outline: 1px dashed var(--fail); padding: 0 0.15rem;
}
.inj-chat-screen { margin-top: 0.7rem; }

/* ---------- 14 costs ---------- */

.cost-local {
  margin-top: 0.6rem; padding-top: 0.55rem;
  border-top: 1px dashed var(--panel-edge);
  font-family: var(--sans); font-size: 0.78rem; line-height: 1.55; color: var(--ink-soft);
}
.cost-local b { color: var(--phosphor-soft); }

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

footer {
  border-top: 1px solid var(--panel-edge); margin-top: 3rem; padding: 1.4rem 1.2rem 2.2rem;
  text-align: center; font-size: 0.75rem; color: var(--ink-soft); line-height: 1.8;
}

/* ---------- responsive & motion ---------- */

@media (max-width: 42rem) {
  /* the TOC collapses to a single scrollable row; pager.js keeps the
     current chip centred. Edge fades hint that it scrolls. */
  .toc {
    flex-wrap: nowrap; overflow-x: auto;
    -webkit-overflow-scrolling: touch; scrollbar-width: none;
    mask-image: linear-gradient(90deg, transparent 0, #000 1.1rem, #000 calc(100% - 1.6rem), transparent 100%);
    -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 1.1rem, #000 calc(100% - 1.6rem), transparent 100%);
  }
  .toc::-webkit-scrollbar { display: none; }
  .toc a { flex: none; }
  .par-grid, .moe-wrap, .birth-grid, .prompt-grid { grid-template-columns: 1fr; }
  .nt-bar { grid-template-columns: 5.5rem 1fr 3rem; }
  .ctx-row { grid-template-columns: 6.5rem 1fr; }
  .priv-row { grid-template-columns: 1fr; gap: 0.1rem; }
  /* the SVG scales down with the viewport: bump user-unit sizes to keep labels legible */
  .emb-pt text { font-size: 15px; }
  .emb-sim { font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}