/* Lab4IQM — layout: graph-paper hero over a quiet document column; figures sit on white "plates"
   like printed plots; palette taken from the plots themselves (plot blue, plot orange, ink). */
:root {
  --paper: #f7f9fb;
  --plate: #ffffff;
  --ink: #14202e;
  --ink-soft: #4a5868;
  --rule: #d9e1e8;
  --grid: rgba(31, 111, 178, 0.07);
  --grid-major: rgba(31, 111, 178, 0.13);
  --blue: #1f6fb2;
  --blue-ink: #ffffff;
  --orange: #c9620f;
  --console: #101a26;
  --console-fg: #d6e2ee;
  --console-dim: #8aa0b5;
  --console-ok: #f2a65a;
  --f-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --f-body: "Public Sans", "Helvetica Neue", Arial, system-ui, sans-serif;
  --f-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.6rem;
  --step-3: clamp(2rem, 4.2vw, 3.1rem);
  --radius: 6px;
  --measure: 66ch;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f1620; --plate: #f4f7fa; --ink: #e5ecf3; --ink-soft: #a3b2c2; --rule: #263444;
    --grid: rgba(106, 168, 224, 0.06); --grid-major: rgba(106, 168, 224, 0.12);
    --blue: #6aa8e0; --blue-ink: #0d1620; --orange: #f0a050;
    --console: #0a1119; --console-fg: #d6e2ee; --console-dim: #7f95aa; --console-ok: #f2a65a;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0f1620; --plate: #f4f7fa; --ink: #e5ecf3; --ink-soft: #a3b2c2; --rule: #263444;
  --grid: rgba(106, 168, 224, 0.06); --grid-major: rgba(106, 168, 224, 0.12);
  --blue: #6aa8e0; --blue-ink: #0d1620; --orange: #f0a050;
  --console: #0a1119; --console-fg: #d6e2ee; --console-dim: #7f95aa; --console-ok: #f2a65a;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--f-body); font-size: var(--step-0); line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; border-radius: 3px; }
h1, h2, h3 { font-family: var(--f-display); line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: var(--step-3); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: var(--step-2); font-weight: 650; letter-spacing: -0.01em; }
h3 { font-size: var(--step-1); font-weight: 600; }
p { margin: 0; max-width: var(--measure); }
code, kbd { font-family: var(--f-mono); font-size: 0.9em; }
.wrap {
  max-width: 1120px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.eyebrow {
  font-family: var(--f-mono); font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-soft);
}

/* header */
.site-head { border-bottom: 1px solid var(--rule); background: var(--paper); }
.site-head .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 28px; padding-block: 14px; }
.brand { display: flex; align-items: baseline; gap: 8px; text-decoration: none; color: var(--ink); }
.brand b { font-family: var(--f-display); font-size: 1.35rem; font-weight: 700; letter-spacing: -0.02em; }
.brand b span { color: var(--blue); }
.brand small { font-family: var(--f-mono); font-size: 0.7rem; color: var(--ink-soft); }
.site-head nav { display: flex; flex-wrap: wrap; gap: 4px 20px; margin-left: auto; }
.site-head nav a { color: var(--ink); text-decoration: none; font-weight: 500; padding-block: 4px; }
.site-head nav a[aria-current="page"] { color: var(--blue); box-shadow: inset 0 -2px 0 var(--blue); }

/* graph-paper band */
.paper-grid {
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 50px 50px, 50px 50px, 10px 10px, 10px 10px;
  border-bottom: 1px solid var(--rule);
}

.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 40px; align-items: center; padding-block: 56px 60px; }
.hero h1 em { font-style: normal; color: var(--blue); }
.hero .lede { font-size: var(--step-1); line-height: 1.5; color: var(--ink-soft); margin-top: 18px; max-width: 34ch; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: var(--radius);
  font-weight: 600; text-decoration: none; border: 1.5px solid var(--blue); color: var(--blue); background: transparent;
  font-family: var(--f-body); font-size: var(--step-0); cursor: pointer;
}
.btn.primary { background: var(--blue); color: var(--blue-ink); }
.btn:hover { filter: brightness(1.08); }
.meta-line { margin-top: 18px; font-family: var(--f-mono); font-size: 0.78rem; color: var(--ink-soft); }

/* console */
.console {
  background: var(--console); color: var(--console-fg); border-radius: 8px; overflow: hidden;
  font-family: var(--f-mono); font-size: 0.8rem; line-height: 1.55; box-shadow: 0 18px 40px -24px rgba(10, 20, 30, 0.55);
}
.console .bar { display: flex; justify-content: space-between; gap: 12px; padding: 8px 14px; color: var(--console-dim); border-bottom: 1px solid rgba(255,255,255,0.07); font-size: 0.72rem; }
.console pre { margin: 0; padding: 14px 16px 16px; overflow-x: auto; white-space: pre; }
.console .in { color: #ffffff; }
.console .in::before { content: ">>> "; color: var(--console-dim); }
.console .ok { color: var(--console-ok); }

/* sections */
section.block { padding-block: 64px; }
section.block + section.block { border-top: 1px solid var(--rule); }
.section-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 12px 24px; margin-bottom: 28px; }
.section-head p { color: var(--ink-soft); }

/* module cards */
.modules { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); gap: 22px; }
.mod {
  display: grid; grid-template-rows: auto 1fr; text-decoration: none; color: var(--ink);
  border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; background: var(--paper);
  transition: border-color 0.15s, transform 0.15s;
}
.mod:hover { border-color: var(--blue); transform: translateY(-2px); }
.plate { background: var(--plate); display: grid; place-items: center; padding: 14px; }
.mod { min-width: 0; }
.mod.ask { grid-template-rows: 1fr; border-style: dashed; background: transparent; }
.mod.ask .body { justify-content: center; padding: 28px 24px; }
.mod .plate { aspect-ratio: 16 / 10; overflow: hidden; min-width: 0; }
.mod .plate img { width: 100%; height: 100%; object-fit: contain; }
.mod .body { display: flex; flex-direction: column; gap: 8px; padding: 16px 18px 18px; min-width: 0; }
.mod .row { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.mod h3 { font-size: 1.15rem; }
.mod p { font-size: var(--step--1); color: var(--ink-soft); }
.mod .src { font-size: 0.78rem; color: var(--ink-soft); font-style: italic; margin-top: auto; }
.ver { font-family: var(--f-mono); font-size: 0.75rem; white-space: nowrap; font-variant-numeric: tabular-nums; }
.badge {
  display: inline-block; font-family: var(--f-mono); font-size: 0.68rem; letter-spacing: 0.05em; text-transform: uppercase;
  padding: 2px 7px; border-radius: 3px; border: 1px solid currentColor;
}
.badge.complete { color: var(--blue); }
.badge.progress { color: var(--orange); }

/* three-up explanation */
.three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.three h3 { margin-bottom: 8px; }
.three p { color: var(--ink-soft); }

/* split */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.split .plate { border-radius: var(--radius); border: 1px solid var(--rule); }
.prose { display: flex; flex-direction: column; gap: 14px; }
.prose ul, .prose ol { margin: 0; padding-left: 1.3em; max-width: var(--measure); display: grid; gap: 6px; }

/* downloads */
.table-scroll { overflow-x: auto; border: 1px solid var(--rule); border-radius: var(--radius); }
table { border-collapse: collapse; width: 100%; font-size: var(--step--1); min-width: 720px; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-family: var(--f-mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-soft); font-weight: 500; }
tr:last-child td { border-bottom: 0; }
td.num { font-variant-numeric: tabular-nums; font-family: var(--f-mono); font-size: 0.8rem; white-space: nowrap; }
td .name { font-weight: 600; color: var(--ink); }
td .hash { font-family: var(--f-mono); font-size: 0.7rem; color: var(--ink-soft); word-break: break-all; }
.core-card {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 28px; align-items: center;
  border: 1.5px solid var(--blue); border-radius: var(--radius); padding: 22px 24px; margin-bottom: 28px;
}
.core-card p { color: var(--ink-soft); margin-top: 6px; }
.steps { counter-reset: s; list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; max-width: 72ch; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 2.2em minmax(0, 1fr); gap: 12px; }
.steps li::before {
  content: counter(s); font-family: var(--f-display); font-weight: 700; color: var(--blue);
  border: 1.5px solid var(--blue); border-radius: 50%; width: 2em; height: 2em; display: grid; place-items: center; font-size: 0.95rem;
}
.copybox {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center; border: 1px dashed var(--rule); border-radius: var(--radius);
  padding: 10px 12px; background: var(--paper); margin-top: 8px;
}
.copybox code { flex: 1 1 260px; min-width: 0; word-break: break-all; }
.copybox button { font-family: var(--f-mono); font-size: 0.75rem; padding: 4px 10px; border-radius: 4px; border: 1px solid var(--rule); background: transparent; color: var(--ink); cursor: pointer; }

/* module page */
.mod-hero .wrap { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 40px; align-items: center; padding-block: 44px 48px; }
.mod-hero .plate { border-radius: var(--radius); border: 1px solid var(--rule); max-height: 360px; }
.mod-hero .plate img { max-height: 320px; width: auto; max-width: 100%; object-fit: contain; }
.facts { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 6px 18px; margin: 20px 0 0; font-size: var(--step--1); }
.facts dt { font-family: var(--f-mono); font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-soft); padding-top: 2px; }
.facts dd { margin: 0; }
.examples { display: grid; gap: 14px; }
.example { display: grid; grid-template-columns: minmax(180px, 0.42fr) minmax(0, 1fr); gap: 6px 20px; padding-bottom: 14px; border-bottom: 1px solid var(--rule); }
.example:last-child { border-bottom: 0; }
.example .t { font-weight: 600; }
.example code { background: var(--console); color: var(--console-fg); padding: 6px 10px; border-radius: 4px; display: block; overflow-x: auto; white-space: pre; font-size: 0.78rem; min-width: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips code { border: 1px solid var(--rule); border-radius: 4px; padding: 3px 8px; font-size: 0.8rem; }

footer { border-top: 1px solid var(--rule); padding-block: 32px 40px; font-size: var(--step--1); color: var(--ink-soft); }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px; }
footer p { max-width: 60ch; }

@media (max-width: 860px) {
  .hero .wrap, .split, .mod-hero .wrap { grid-template-columns: minmax(0, 1fr); }
  .three { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .example { grid-template-columns: minmax(0, 1fr); }
  .core-card { grid-template-columns: minmax(0, 1fr); }
  section.block { padding-block: 44px; }
}
@media (prefers-reduced-motion: reduce) { .mod { transition: none; } .mod:hover { transform: none; } }