/* Bridge: the course's tokens and components on the portfolio's design system (css/site.css). Loaded last.

   Rules of this file:
   - nothing here targets .lab or anything inside it; the labs keep the course's own styles;
   - the role colours (student, teacher, positive, negative, ignored, on-role) keep the course's values;
   - site.css (portfolio) is loaded first and styles.css (course) after it. The course redefines a few tokens that the
     portfolio also names (--surface, --muted, --font-display, --font-mono, --radius), so those are restated here with
     the portfolio's values; tools/check-explainer.py compares them with site.css. */

/* ---- 1. tokens: the course's names, the portfolio's values --------------------------------------------------- */

:root:not([data-theme="light"]),
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface: #121820;
  --muted: #93A1B0;
  --student: #43B18D; --teacher: #579FDB; --positive: #F17855; --negative: #B47DD4; --ignored: #6A7581;
  --on-role: #0B0F14;
}
:root[data-theme="light"] {
  color-scheme: light;
  --surface: #FFFFFF;
  --muted: #5B6472;
  --student: #2A7F62; --teacher: #1F6FB2; --positive: #E4572E; --negative: #7A3E9D; --ignored: #9AA5B1;
  --on-role: #FFFFFF;
}
:root, :root:not([data-theme="light"]), :root[data-theme="dark"], :root[data-theme="light"] {
  --paper: var(--bg);
  --ink: var(--text);
  --line: var(--border);
  --sunken: var(--surface-2);
  --hatch: var(--border);
  --focus: var(--accent);
  --control: var(--muted);
  --on-ink: var(--bg);
  --font-display: "Space Grotesk", "Inter", system-ui, sans-serif;
  --font-body: var(--font-text);
  --font-mono: "JetBrains Mono", "Cascadia Code", Consolas, "Liberation Mono", monospace;
  --pf-radius: 14px;
}

/* the course sets a flat paper background on body; the portfolio's glow and grid come back */
body {
  background-color: var(--bg);
  background-image: var(--glow), linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  background-attachment: fixed;
  overflow-x: hidden;
}

/* ---- 1b. site.css's global rules, undone inside the course's main --------------------------------------------------
   site.css sets border-box on every element, display:block on images and no margin on paragraphs; the course's
   stylesheet was written without any of these, so inside .page they go back to the browser's defaults. (Zero
   specificity: the course's own rules still win.) */
:where(.page) *, :where(.page) *::before, :where(.page) *::after { box-sizing: revert; }
:where(.page) img { display: inline; }
:where(.page) p { margin-block: 0 1rem; }
:where(.page) h3 { line-height: 1.2; letter-spacing: normal; }

/* ---- 2. header and footer ---------------------------------------------------------------------------------- */

/* the course's boot.js looks for .topbar (it measures it and moves the progress line in it), so the header carries
   that class too; the course's own top bar rules are put back to the portfolio's here */
.site-header.topbar {
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 0;
}
.site-header a, .site-footer a { text-decoration: none; }
.site-header .nav-links a:hover, .site-footer a:hover { text-decoration: none; }
.site-footer a { color: var(--accent); }
.site-footer a:hover { text-decoration: underline; }
.brand { color: var(--text); }
/* the course styles every .mark as a source badge (border, capitals, a small square); the brand's mark is not one */
.brand .mark { padding: 0; border: 0; gap: 0; text-transform: none; letter-spacing: -0.02em; vertical-align: baseline; white-space: normal; }
.brand .mark::before { content: none; }
.site-header .nav { column-gap: 12px; }
.crumb { font-family: var(--font-mono); color: var(--muted); font-size: 0.85rem; white-space: nowrap; }
.crumb:hover { color: var(--text); }
.nav-links a { white-space: nowrap; }
/* nine part links do not fit beside the brand and the icons: from 961 px up they take a second row */
@media (min-width: 961px) {
  .site-header .nav { flex-wrap: wrap; min-height: 0; padding-top: 8px; }
  .site-header .nav-actions { margin-left: auto; }
  .site-header .nav-links { order: 3; flex-basis: 100%; margin: 0; padding: 0 0 8px; flex-wrap: wrap; }
  .site-header .nav-links a { font-size: 0.86rem; padding: 6px 10px; }
}
/* up to 960 px the portfolio's menu button takes over (site.css does this at 900 px) */
@media (max-width: 960px) {
  .site-header .nav { flex-wrap: wrap; }
  #menu-toggle { display: inline-grid; margin-left: auto; }
  .nav-actions { order: 2; }
  .nav-links { display: none; order: 3; flex-basis: 100%; flex-direction: column; gap: 2px; padding: 6px 0 12px; margin: 0; }
  .nav-links.open { display: flex; }
}
.nav-links a[aria-current="page"] { color: var(--text); background: var(--surface-2); }
.site-header .progress { height: 2px; overflow: hidden; background: var(--border); }
.site-header .progress-bar { background: var(--accent); }

/* ---- 3. page frame ------------------------------------------------------------------------------------------ */

.page { max-width: var(--max); margin-inline: auto; }
/* the reading column is aligned to the portfolio container's left edge instead of centred, and widened:
   hero, sections, pager and glossary span the container; paragraphs, lists and boxes keep a readable measure
   of 80 characters; labs take the container's inner width (--wide feeds the course's --lab-w) */
:root { --measure: 80ch; --wide: calc(var(--max) - 2 * var(--gutter)); }
.page > :not(.lab) { max-width: none; margin-inline: 0; }
.page .sec > :is(p, ul, ol, dl, blockquote, .note, .eq, details, .outcomes, .sources),
.page .prologue > p, .page .part-head > p, .page .end > :is(p, dl) { max-width: var(--measure); }

/* ---- 4. hero: .prologue (start page) and .part-head (the other eight) ------------------------------------------ */

.prologue, .part-head { padding-block: clamp(32px, 5vw, 64px) clamp(16px, 3vw, 32px); }
.page-title, .part-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-block: 0;
}
.prologue .eyebrow, .part-head .eyebrow {
  font-size: 0.85rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--accent);
  margin-bottom: 14px;
}
.part-head .part-kicker { display: none; }
.prologue .lead, .part-head .lead { font-size: clamp(1.05rem, 1.6vw, 1.25rem); line-height: 1.55; color: var(--muted); max-width: 56ch; margin-top: 18px; }
.prologue .actions { margin-top: 26px; }
.prologue .actions .btn {
  min-height: 0;
  padding: 11px 16px;
  font: 500 0.95rem/1.6 var(--font-text);
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
}
.prologue .actions .btn:hover { background: var(--surface-2); }
.prologue .actions .btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.prologue .actions .btn.primary:hover { filter: brightness(1.06); }

/* ---- 5. sections: the number as the portfolio's index line ----------------------------------------------------- */

.page > .sec { margin-block-start: 0; padding-block: clamp(28px, 4.5vw, 52px) 0; border-top: 1px solid var(--border); }
.page > .part-head + .sec, .page > .prologue + .sec { margin-block-start: 0; }
.sec-title { font-family: var(--font-display); font-weight: 600; font-size: clamp(1.6rem, 3.2vw, 2.2rem); letter-spacing: -0.015em; line-height: 1.15; }
.sec-title .sec-num {
  display: block;
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin: 0 0 8px;
}
.end > h2 { font-family: var(--font-display); }

/* links in the running text: the portfolio's accent, underlined so that they read as links */
.sec > :is(p, ul, ol, dl) a, .prologue a:not(.btn), .part-head a, .end a {
  color: var(--accent);
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
}
.sec > :is(p, ul, ol, dl) a:hover, .prologue a:not(.btn):hover, .part-head a:hover, .end a:hover { text-decoration-color: var(--accent); }

/* ---- 6. content blocks on the portfolio's card tokens -------------------------------------------------------- */

aside.why { border-radius: var(--radius-sm); border-inline-start: 3px solid var(--accent); box-shadow: var(--shadow); }
section.walk { border-radius: var(--pf-radius); box-shadow: var(--shadow); }
.map > li { border-radius: var(--radius-sm); box-shadow: var(--shadow); }
.map-link { color: var(--accent); }

/* ---- 7. pager as portfolio buttons ----------------------------------------------------------------------------- */

.pager { padding-top: 32px; border-top: 1px solid var(--border); }
.pager > a { border-radius: var(--radius-sm); color: var(--text); }
.pager > a:hover { background: var(--surface-2); }
.pager > .pager-next { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.pager > .pager-next:hover { background: var(--accent); filter: brightness(1.06); }
.pager > .pager-next .pager-dir { color: var(--accent-fg); opacity: 0.75; }