/* Zero to Agent — design system v2: technical documentation.
   One type family (IBM Plex), neutral greys, one accent. Status colours appear only in verdicts.
   Every component draws from these tokens; labs must not introduce their own palette. */

:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --sunken: #f3f3f1;
  --ink: #1c1f23;
  --ink-2: #474d55;
  --muted: #747a83;
  --line: #e3e3df;
  --line-2: #cfd0cb;
  --accent: #2557c7;
  --accent-ink: #1d47a6;
  --accent-soft: #e9effb;
  --on-accent: #ffffff;
  --good: #1f7a45;
  --good-soft: #eaf5ee;
  --bad: #b3261e;
  --bad-soft: #fbecea;
  --warn: #8a5a00;
  --warn-soft: #fbf3e2;
  --code-bg: #f3f3f1;

  --radius: 8px;
  --radius-sm: 6px;
  --font: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --sidebar-w: 280px;
  --topbar-h: 52px;
  --measure: 760px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #131416; --surface: #191b1e; --sunken: #1f2125; --ink: #e6e7e9; --ink-2: #b9bdc3; --muted: #868b93;
    --line: #2a2d32; --line-2: #3a3e45; --accent: #7aa5ff; --accent-ink: #9dbcff; --accent-soft: #1d2638; --on-accent: #0b1020;
    --good: #6fcf97; --good-soft: #15261c; --bad: #f28b82; --bad-soft: #2c1918; --warn: #e6b450; --warn-soft: #2a2312;
    --code-bg: #1f2125; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #131416; --surface: #191b1e; --sunken: #1f2125; --ink: #e6e7e9; --ink-2: #b9bdc3; --muted: #868b93;
  --line: #2a2d32; --line-2: #3a3e45; --accent: #7aa5ff; --accent-ink: #9dbcff; --accent-soft: #1d2638; --on-accent: #0b1020;
  --good: #6fcf97; --good-soft: #15261c; --bad: #f28b82; --bad-soft: #2c1918; --warn: #e6b450; --warn-soft: #2a2312;
  --code-bg: #1f2125; color-scheme: dark;
}
/* Legacy aliases used by lab code. They all resolve to the one palette. */
:root {
  --card: var(--surface); --bg-2: var(--sunken);
  --t-start: var(--accent); --t-foundations: var(--accent); --t-cloud: var(--accent); --t-local: var(--accent);
  --t-agentic: var(--accent); --t-trust: var(--accent); --t-capstone: var(--accent); --track: var(--accent);
  --font-body: var(--font); --font-display: var(--font); --font-mono: var(--mono);
  --shadow: none; --shadow-lg: 0 8px 30px rgba(0,0,0,.18);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.65 var(--font); -webkit-font-smoothing: antialiased; }
body.big { font-size: 18px; }
a { color: var(--accent-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
h1, h2, h3, h4 { font-family: var(--font); color: var(--ink); line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 2rem; font-weight: 600; letter-spacing: -.01em; }
h2 { font-size: 1.35rem; font-weight: 600; margin-top: 2.2em; }
h3 { font-size: 1.08rem; font-weight: 600; margin-top: 1.6em; }
h4 { font-size: 1rem; font-weight: 600; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.3em; }
li { margin: .3em 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2.5em 0; }
code, kbd, pre { font-family: var(--mono); font-size: .875em; }
code { background: var(--code-bg); padding: .1em .35em; border-radius: 4px; }
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: 12px 14px; overflow-x: auto; line-height: 1.5; }
pre code { background: none; padding: 0; }
kbd { border: 1px solid var(--line-2); border-bottom-width: 2px; border-radius: 4px; padding: 0 5px; font-size: .78em; background: var(--surface); }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
.note { font-size: .86rem; color: var(--muted); }
.dated { font-size: .85em; color: var(--muted); }

/* ---------- top bar ---------- */
.topbar { position: sticky; top: 0; z-index: 30; height: var(--topbar-h); display: flex; align-items: center; gap: 8px; padding: 0 16px; background: var(--bg); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 1rem; white-space: nowrap; }
.brand em { font-style: normal; font-weight: 400; color: var(--muted); }
.topbar-progress { flex: 1; max-width: 220px; height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; margin-left: auto; }
.topbar-progress .bar { height: 100%; width: 0; background: var(--accent); transition: width .4s ease; }
.progress-label { font: 500 .78rem var(--mono); color: var(--muted); min-width: 4ch; }
.icon-btn { display: inline-grid; place-items: center; height: 32px; min-width: 32px; padding: 0 8px; border-radius: 6px; border: 1px solid transparent; background: none; cursor: pointer; color: var(--ink-2); font-size: .82rem; }
.icon-btn:hover { background: var(--sunken); border-color: var(--line); }
.menu-btn { display: none; }

/* ---------- layout ---------- */
.layout { display: grid; grid-template-columns: var(--sidebar-w) minmax(0, 1fr); min-height: calc(100vh - var(--topbar-h)); }
.sidebar { position: sticky; top: var(--topbar-h); height: calc(100vh - var(--topbar-h)); overflow-y: auto; border-right: 1px solid var(--line); padding: 16px 12px 40px; background: var(--bg); }
main { min-width: 0; padding: 0 0 96px; outline: none; }
.page { max-width: var(--measure); margin: 0 auto; padding: 40px 32px 0; }
.page.wide { max-width: 960px; }
.scrim { display: none; }
@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
  .menu-btn { display: inline-grid; }
  .sidebar { position: fixed; left: 0; top: var(--topbar-h); z-index: 25; width: min(86vw, 300px); transform: translateX(-102%); transition: transform .2s ease; box-shadow: var(--shadow-lg); }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { display: block; position: fixed; inset: var(--topbar-h) 0 0 0; background: rgba(0,0,0,.3); z-index: 20; }
  .page { padding: 24px 16px 0; }
  .topbar-progress { display: none; }
  .progress-label { margin-left: auto; }
}
@media (max-width: 480px) { .topbar { gap: 2px; padding: 0 8px; } .progress-label { display: none; } #searchBtn { margin-left: auto; } }

/* ---------- sidebar ---------- */
.nav-home { display: block; padding: 6px 10px; border-radius: 6px; color: var(--ink-2); text-decoration: none; font-size: .9rem; }
.nav-home:hover { background: var(--sunken); color: var(--ink); }
.nav-home.active { color: var(--ink); font-weight: 600; background: var(--sunken); }
.nav-track { margin-top: 18px; }
.nav-track-title { font: 600 .7rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); padding: 0 10px 4px; }
.nav-link { display: grid; grid-template-columns: 22px 1fr auto; align-items: baseline; gap: 6px; padding: 5px 10px; border-left: 2px solid transparent; border-radius: 0 6px 6px 0; color: var(--ink-2); text-decoration: none; font-size: .88rem; line-height: 1.35; }
.nav-link:hover { background: var(--sunken); color: var(--ink); }
.nav-link.active { color: var(--ink); font-weight: 600; background: var(--sunken); border-left-color: var(--accent); }
.nav-num { font: 500 .75rem var(--mono); color: var(--muted); }
.nav-link.done .nav-num { color: var(--accent); }
.nav-link .nav-min { font: .72rem var(--mono); color: var(--muted); }
.nav-opt { font-style: normal; font-size: .72rem; color: var(--muted); }
.nav-extra { margin-top: 20px; padding-top: 12px; border-top: 1px solid var(--line); }

/* ---------- home ---------- */
.hero { padding: 56px 0 8px; }
.hero .kicker { font: 600 .75rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); }
.hero h1 { font-size: clamp(2rem, 4vw, 2.6rem); margin: .3em 0 .4em; }
.hero .lede { font-size: 1.12rem; color: var(--ink-2); max-width: 680px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 6px; font-weight: 500; font-size: .9rem; text-decoration: none; cursor: pointer; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); }
.btn:hover { border-color: var(--ink-2); color: var(--ink); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn.primary:hover { background: var(--accent-ink); border-color: var(--accent-ink); color: var(--on-accent); }
.btn.small { padding: 5px 10px; font-size: .84rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.track-grid, .three-way, .compare, .stat-row { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 20px 0; }
.track-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.track-card { background: var(--surface); padding: 18px; }
.track-card h3 { margin: 0 0 4px; font-size: 1rem; }
.track-card p { font-size: .88rem; color: var(--ink-2); margin: 0 0 10px; }
.track-card ol { margin: 0; padding-left: 1.4em; font-size: .88rem; }
.track-card a { color: var(--ink); text-decoration: none; }
.track-card a:hover { color: var(--accent-ink); text-decoration: underline; }
.track-card .meter { height: 3px; background: var(--line); border-radius: 2px; margin-top: 12px; overflow: hidden; }
.track-card .meter > span { display: block; height: 100%; background: var(--accent); width: 0; }
.three-way { grid-template-columns: repeat(3, 1fr); }
.three-way > div { background: var(--surface); padding: 16px; }
.three-way h4 { margin: 0 0 4px; }
.three-way p { font-size: .88rem; color: var(--ink-2); margin: 0; }
@media (max-width: 700px) { .three-way { grid-template-columns: 1fr; } }

/* ---------- module page ---------- */
.mod-head .crumb { font: 500 .78rem var(--font); color: var(--muted); display: flex; gap: 8px; flex-wrap: wrap; }
.mod-head .crumb span.sep { color: var(--line-2); }
.mod-head h1 { margin-top: .3em; }
.mod-head .sub { font-size: 1.08rem; color: var(--ink-2); }
.mod-meta { display: flex; gap: 16px; flex-wrap: wrap; font: .8rem var(--mono); color: var(--muted); margin-top: 10px; }
.objectives { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 14px 0; margin: 22px 0; }
.objectives h4 { margin: 0 0 6px; font: 600 .72rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.objectives ul { margin: 0; }
.prose > :first-child { margin-top: 0; }
.prose blockquote { margin: 1.2em 0; padding: .1em 1em; border-left: 2px solid var(--line-2); color: var(--ink-2); }
.prose table { width: 100%; border-collapse: collapse; font-size: .9rem; margin: 1.2em 0; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { font: 600 .74rem var(--font); letter-spacing: .05em; text-transform: uppercase; color: var(--muted); }
dfn.term { font-style: normal; border-bottom: 1px dotted var(--muted); cursor: help; }
dfn.term:hover, dfn.term:focus { color: var(--accent-ink); border-bottom-color: var(--accent); }

/* One callout component; variants differ by label (warn also by colour). */
.callout, .tldr, .story, .apply, .reveal, .assume { margin: 1.6em 0; }
.callout { border-left: 3px solid var(--line-2); background: var(--sunken); padding: 12px 16px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.callout::before { display: block; font: 600 .7rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.callout.wonder::before { content: "Common question"; }
.callout.tip::before { content: "Practice"; }
.callout.analogy::before { content: "IT analogy"; }
.callout.warn { border-left-color: var(--warn); background: var(--warn-soft); }
.callout.warn::before { content: "Watch out"; color: var(--warn); }
.callout h4 { margin: 0 0 4px; font-size: .95rem; }
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.tldr { border-left: 3px solid var(--accent); padding: 4px 0 4px 16px; font-size: 1.04rem; }
.tldr h4 { margin: 0 0 4px; font: 600 .7rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); }
.tldr p:last-child { margin: 0; }
.story { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.story-head { display: flex; gap: 10px; padding: 8px 16px; border-bottom: 1px solid var(--line); font: 600 .7rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.story-head .date { margin-left: auto; font: .75rem var(--mono); letter-spacing: 0; text-transform: none; }
.story-body { padding: 14px 16px; }
.story-body p:last-child { margin-bottom: 0; }
.story-lesson { padding: 10px 16px; border-top: 1px solid var(--line); font-size: .92rem; }
.reveal { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.reveal summary { cursor: pointer; padding: 10px 16px; font-weight: 500; list-style: none; display: flex; gap: 10px; }
.reveal summary::-webkit-details-marker { display: none; }
.reveal summary::before { content: "+"; font-family: var(--mono); color: var(--muted); width: 1ch; }
.reveal[open] summary::before { content: "−"; }
.reveal > div { padding: 0 16px 12px 36px; }
.compare { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin: 1.4em 0; }
.compare > div { background: var(--surface); padding: 14px; }
.compare h4 { margin: 0 0 6px; font-size: .92rem; }
.compare ul { margin: 0; padding-left: 1.1em; font-size: .9rem; }

/* Expectation vs reality: the course's signature block. */
.assume { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.assume > div { padding: 12px 16px; }
.assume > .actual { border-left: 1px solid var(--line); }
.assume .lbl { font: 600 .7rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 4px; }
.assume .actual .lbl { color: var(--accent-ink); }
.assume p:last-child { margin: 0; }
.assume .why { grid-column: 1 / -1; border-top: 1px solid var(--line); font-size: .92rem; color: var(--ink-2); background: var(--sunken); }
@media (max-width: 640px) { .assume { grid-template-columns: 1fr; } .assume > .actual { border-left: 0; border-top: 1px solid var(--line); } }

/* ---------- labs ---------- */
.lab { margin: 2em 0; border: 1px solid var(--line-2); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.lab-head { display: flex; align-items: center; gap: 10px; padding: 10px 16px; border-bottom: 1px solid var(--line); background: var(--sunken); }
.lab-head .tag { font: 600 .68rem var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--accent-ink); }
.lab-head h3 { margin: 0; font-size: .98rem; }
.lab-body { padding: 16px; }
.lab-intro { font-size: .92rem; color: var(--ink-2); margin-bottom: 14px; }
.lab-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 10px 0; }
.lab label { font-size: .85rem; font-weight: 500; color: var(--ink-2); }
.lab input[type="text"], .lab input[type="number"], .lab input[type="url"], .lab input[type="search"], .lab textarea, .lab select {
  font: inherit; font-size: .92rem; color: var(--ink); background: var(--bg); border: 1px solid var(--line-2); border-radius: 6px; padding: 7px 10px; min-width: 0; }
.lab textarea { width: 100%; resize: vertical; min-height: 80px; line-height: 1.5; }
.lab input:focus, .lab textarea:focus, .lab select:focus { border-color: var(--accent); outline: none; }
.lab input[type="range"] { accent-color: var(--accent); width: 180px; }
.lab .readout { font: .82rem var(--mono); color: var(--ink-2); }
.stat-row { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); margin: 14px 0; }
.stat { background: var(--surface); padding: 10px 12px; }
.stat .k { font: 600 .68rem var(--font); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.stat .v { font: 500 1.25rem var(--mono); }
.stat .v small { font-size: .65em; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--line-2); background: var(--surface); border-radius: 6px; padding: 4px 10px; font-size: .84rem; cursor: pointer; color: var(--ink-2); }
.chip:hover { border-color: var(--ink-2); color: var(--ink); }
.chip.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent-ink); }

/* tokenizer: two alternating tints are enough to see boundaries */
.tokens { display: flex; flex-wrap: wrap; gap: 2px; font: .9rem/1.2 var(--mono); padding: 10px; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; min-height: 48px; }
.tok { padding: 3px 2px; border-radius: 3px; white-space: pre; position: relative; background: var(--accent-soft) !important; color: var(--ink); }
.tok:nth-child(even) { background: var(--sunken) !important; }
.tok:hover::after { content: attr(data-id); position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%); background: var(--ink); color: var(--bg); font-size: .7rem; padding: 2px 6px; border-radius: 3px; white-space: nowrap; margin-bottom: 3px; z-index: 2; }
.tok.ws { opacity: .5; }

/* next-word */
.nw-text { font-size: 1.15rem; line-height: 1.55; padding: 12px 14px; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; min-height: 60px; }
.nw-text .gen { color: var(--accent-ink); background: var(--accent-soft); border-radius: 3px; padding: 0 2px; }
.nw-text .cursor { display: inline-block; width: 2px; height: 1.05em; background: var(--accent); vertical-align: -2px; animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.bars { display: grid; gap: 4px; margin-top: 12px; }
.bar-row { display: grid; grid-template-columns: 120px 1fr 56px; align-items: center; gap: 10px; font-size: .86rem; cursor: pointer; border-radius: 4px; padding: 2px 4px; }
.bar-row:hover { background: var(--sunken); }
.bar-row .w { font-family: var(--mono); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar-row .track { height: 12px; background: var(--sunken); border-radius: 3px; overflow: hidden; }
.bar-row .fill { height: 100%; background: var(--accent); border-radius: 3px; transition: width .3s ease; }
.bar-row.picked .fill { background: var(--good); }
.bar-row .p { font: .78rem var(--mono); text-align: right; color: var(--muted); }

/* context window */
.ctx-window { display: flex; flex-direction: column; gap: 4px; padding: 10px; background: var(--bg); border: 1px dashed var(--line-2); border-radius: 6px; min-height: 220px; max-height: 360px; overflow: hidden; }
.ctx-msg { padding: 6px 10px; border-radius: 4px; font-size: .85rem; display: flex; gap: 8px; align-items: baseline; background: var(--surface); border: 1px solid var(--line); }
.ctx-msg .who { font: 600 .66rem var(--mono); text-transform: uppercase; min-width: 56px; color: var(--muted); }
.ctx-msg .n { margin-left: auto; font: .72rem var(--mono); color: var(--muted); }
.ctx-msg.sys, .ctx-msg.tool { background: var(--sunken); }
.ctx-msg.summary { background: var(--warn-soft); border: 1px dashed var(--warn); }
.ctx-gauge { height: 8px; background: var(--sunken); border-radius: 4px; overflow: hidden; margin: 10px 0 4px; }
.ctx-gauge > span { display: block; height: 100%; background: var(--accent) !important; transition: width .3s; }

/* attention, embeddings */
.attn-wrap { position: relative; padding: 70px 8px 16px; overflow-x: auto; }
.attn-words { display: flex; flex-wrap: wrap; gap: 6px 4px; position: relative; z-index: 1; font-size: 1.1rem; }
.attn-word { padding: 3px 7px; border-radius: 4px; cursor: pointer; border: 1px solid transparent; }
.attn-word.focus { border-color: var(--accent); }
.attn-svg { position: absolute; inset: 0; pointer-events: none; overflow: visible; }
.emb-canvas { width: 100%; aspect-ratio: 16 / 10; background: var(--bg); border: 1px solid var(--line); border-radius: 6px; display: block; touch-action: none; cursor: crosshair; }

/* vram */
.fit-meter { position: relative; height: 26px; background: var(--sunken); border: 1px solid var(--line); border-radius: 4px; overflow: hidden; margin: 12px 0 4px; }
.fit-meter .seg { position: absolute; top: 0; bottom: 0; display: flex; align-items: center; justify-content: center; font: 500 .7rem var(--mono); color: var(--on-accent); white-space: nowrap; overflow: hidden; transition: width .3s, left .3s; }
.fit-meter .seg:nth-child(1) { background: var(--accent) !important; }
.fit-meter .seg:nth-child(2) { background: color-mix(in srgb, var(--accent) 55%, var(--surface)) !important; }
.fit-meter .seg:nth-child(3) { background: var(--muted) !important; }
.fit-meter .cap { position: absolute; top: -2px; bottom: -2px; width: 2px; background: var(--ink); transition: left .3s; }

/* Status verdicts: the only place status colour appears. */
.verdict { padding: 10px 14px; border-radius: 6px; font-size: .92rem; margin-top: 12px; border-left: 3px solid; color: var(--ink) !important; font-weight: 400; }
.verdict.ok { background: var(--good-soft); border-color: var(--good); }
.verdict.tight { background: var(--warn-soft); border-color: var(--warn); }
.verdict.no { background: var(--bad-soft); border-color: var(--bad); }

/* agent log: a terminal in both themes */
.agent-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 14px; }
@media (max-width: 760px) { .agent-grid { grid-template-columns: 1fr; } }
.agent-log { background: #141619; color: #d4d7dc; border-radius: 6px; padding: 12px 14px; font: .79rem/1.55 var(--mono); min-height: 300px; max-height: 420px; overflow-y: auto; }
.agent-log .l { margin: 0 0 8px; white-space: pre-wrap; word-break: break-word; }
.agent-log .think { color: #8b939c; }
.agent-log .call { color: #9ab8ff; }
.agent-log .obs { color: #c7d0d9; }
.agent-log .err { color: #f28b82; }
.agent-log .say { color: #ffffff; }
.agent-log .perm { color: #e6b450; }
.files { border: 1px solid var(--line); border-radius: 6px; background: var(--bg); padding: 8px; font: .8rem var(--mono); }
.files .f { padding: 3px 8px; border-radius: 4px; display: flex; justify-content: space-between; gap: 8px; }
.files .f.touched { background: var(--accent-soft); }
.files pre { margin: 8px 0 0; font-size: .74rem; max-height: 170px; }
.perm-box { margin-top: 10px; padding: 12px; border-radius: 6px; background: var(--warn-soft); border-left: 3px solid var(--warn); font-size: .88rem; }

/* quiz */
.quiz { margin: 2.5em 0 1em; border-top: 1px solid var(--line-2); padding-top: 18px; }
.quiz h3 { margin-top: 0; display: flex; align-items: baseline; gap: 10px; }
.quiz .qcount { margin-left: auto; font: 400 .78rem var(--mono); color: var(--muted); }
.q { padding: 14px 0; border-top: 1px solid var(--line); }
.q:first-of-type { border-top: 0; }
.q-text { font-weight: 500; margin-bottom: 10px; }
.q-choices { display: grid; gap: 6px; }
.q-choice { text-align: left; padding: 9px 12px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface); cursor: pointer; font-size: .92rem; line-height: 1.45; }
.q-choice:hover:not(:disabled) { border-color: var(--accent); }
.q-choice.right { border-color: var(--good); background: var(--good-soft); }
.q-choice.wrong { border-color: var(--bad); background: var(--bad-soft); }
.q-choice:disabled { cursor: default; color: var(--ink); }
.q-explain { margin-top: 10px; font-size: .9rem; padding: 10px 12px; border-radius: 6px; background: var(--sunken); }
.quiz-done { padding: 12px 0; font-weight: 500; }

.mod-foot { margin-top: 3em; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.mod-foot a { display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; text-decoration: none; color: var(--ink); background: var(--surface); }
.mod-foot a:hover { border-color: var(--accent); }
.mod-foot small { display: block; color: var(--muted); font-size: .74rem; }
.mod-foot .next { text-align: right; grid-column: 2; }
.complete-bar { margin-top: 2.5em; display: flex; align-items: center; gap: 14px; padding: 14px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.complete-bar p { margin: 0; flex: 1; min-width: 200px; font-size: .9rem; color: var(--ink-2); }

.apply { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; background: var(--surface); }
.apply-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; margin-bottom: 8px; }
.apply-head .tag { font: 600 .7rem var(--font); letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); }
.apply-task { color: var(--ink-2); font-size: .92rem; }
.apply-q { font-weight: 500; margin-bottom: 8px; }
.apply textarea { width: 100%; font: inherit; font-size: .92rem; color: var(--ink); background: var(--bg); border: 1px solid var(--line-2); border-radius: 6px; padding: 8px 10px; resize: vertical; }
.apply textarea:focus { outline: none; border-color: var(--accent); }
.apply-saved { font-size: .78rem; color: var(--good); min-height: 1.2em; margin-top: 4px; }

/* glossary, tooltip, search, toast */
.gloss-filter { position: sticky; top: calc(var(--topbar-h) + 8px); z-index: 5; margin: 16px 0; }
.gloss-filter input { width: 100%; font: inherit; padding: 9px 12px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface); color: var(--ink); }
.gloss-item { padding: 14px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 140px; }
.gloss-item h3 { margin: 0 0 4px; font-size: 1rem; }
.gloss-item p { margin: 0; color: var(--ink-2); }
.gloss-item .see { font-size: .82rem; margin-top: 6px; }
.gloss-item.hl { background: var(--accent-soft); padding-left: 10px; padding-right: 10px; border-radius: 6px; }
.tooltip { position: fixed; z-index: 60; max-width: 320px; background: var(--ink); color: var(--bg); padding: 9px 12px; border-radius: 6px; font-size: .84rem; line-height: 1.45; pointer-events: none; }
.tooltip b { display: block; font-weight: 600; margin-bottom: 2px; }
dialog.search { border: 1px solid var(--line-2); padding: 0; border-radius: 10px; width: min(600px, 92vw); background: var(--surface); color: var(--ink); margin-top: 12vh; }
dialog.search::backdrop { background: rgba(0,0,0,.35); }
.search-inner { padding: 12px; }
.search-inner input { width: 100%; font: inherit; padding: 10px 12px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--bg); color: var(--ink); }
.search-results { list-style: none; padding: 0; margin: 10px 0 0; max-height: 50vh; overflow-y: auto; }
.search-results li { padding: 8px 10px; border-radius: 6px; cursor: pointer; }
.search-results li b { display: block; font-weight: 600; }
.search-results li span { font-size: .85rem; color: var(--ink-2); }
.search-results li.sel, .search-results li:hover { background: var(--sunken); }
.search-hint { font-size: .76rem; color: var(--muted); margin: 8px 4px 0; }
.toast { position: fixed; bottom: 20px; left: 50%; transform: translate(-50%, 150%); background: var(--ink); color: var(--bg); padding: 9px 16px; border-radius: 6px; font-size: .88rem; transition: transform .25s ease; z-index: 70; max-width: 92vw; }
.toast.show { transform: translate(-50%, 0); }

/* decision helper, scores, cost table, misc lab parts */
.decide-q { margin: 14px 0; }
.decide-q p { font-weight: 500; margin-bottom: 6px; }
.rec-card { border-radius: 6px; padding: 14px 16px; margin-top: 14px; border: 1px solid var(--line-2); border-left: 3px solid var(--accent); background: var(--surface); }
.rec-card h4 { margin: 0 0 6px; }
.score-bars { display: grid; grid-template-columns: 110px 1fr 40px; gap: 6px 10px; align-items: center; font-size: .86rem; margin-top: 10px; }
.score-bars .track { height: 8px; background: var(--sunken); border-radius: 4px; overflow: hidden; }
.score-bars .fill { height: 100%; border-radius: 4px; background: var(--accent) !important; transition: width .3s; }
.cost-table { width: 100%; border-collapse: collapse; font-size: .88rem; margin-top: 10px; }
.cost-table td, .cost-table th { padding: 7px 8px; border-bottom: 1px solid var(--line); text-align: left; }
.cost-table td.num { text-align: right; font-family: var(--mono); }
.cost-table tr.best td { background: var(--accent-soft); }
.inject-page { border: 1px solid var(--line); border-radius: 6px; background: #fff; color: #222; padding: 14px; font-family: Georgia, serif; font-size: .92rem; }
.inject-page .hidden-text { color: #fff; font-size: 2px; }
.inject-page.xray .hidden-text { color: var(--bad); font: .82rem var(--mono); background: var(--bad-soft); display: inline-block; padding: 4px 6px; border-radius: 4px; margin-top: 6px; }

/* progress page */
.cert { border: 1px solid var(--line-2); border-radius: var(--radius); padding: 28px; background: var(--surface); margin: 24px 0; }
.cert h2 { margin: .2em 0; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }
@media print { .topbar, .sidebar, .lab, .quiz, .mod-foot, .complete-bar { display: none !important; } .layout { display: block; } }

/* No italics anywhere on this site (owner accessibility requirement). Emphasis is weight, not slant. */
em, i, cite, dfn, var, address, blockquote, .dated, .apply-task { font-style: normal !important; }
em, i { font-weight: 600; }