/* DE Mastery — reading-first design.
   Newsreader (prose), Inter (interface), JetBrains Mono (code): all SIL OFL, self-hosted. */

@font-face { font-family: "Newsreader"; src: url("/de-mastery/static/fonts/newsreader-normal.woff2") format("woff2"); font-weight: 200 800; font-style: normal; font-display: swap; }
@font-face { font-family: "Newsreader"; src: url("/de-mastery/static/fonts/newsreader-italic.woff2") format("woff2"); font-weight: 200 800; font-style: italic; font-display: swap; }
@font-face { font-family: "Inter"; src: url("/de-mastery/static/fonts/inter-normal.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: "JetBrains Mono"; src: url("/de-mastery/static/fonts/jetbrains-mono-normal.woff2") format("woff2"); font-weight: 100 800; font-style: normal; font-display: swap; }

:root {
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --bg: #faf8f3;  --surface: #ffffff;  --sunken: #f3efe6;
  --ink: #26231d;  --ink-2: #4b463c;  --muted: #7b7467;
  --line: #e6e0d3;  --line-2: #d6cebd;
  --accent: #1d5c63;  --accent-ink: #ffffff;  --accent-soft: #e3eeee;
  --ok: #2c7a4b;  --ok-soft: #e1f0e6;  --bad: #b3372b;  --bad-soft: #f8e4e0;  --warn-soft: #f7edd2;
  --shadow: 0 1px 2px rgba(60,45,20,.06), 0 6px 20px rgba(60,45,20,.06);

  /* syntax */
  --t-comment: #8a8373; --t-keyword: #8a3b7a; --t-string: #2a7a4a; --t-number: #b25b1a;
  --t-func: #1d5c9c; --t-class: #a1481f; --t-builtin: #1d6f78; --t-op: #6b6558; --t-deco: #9a6a00;

  --side-w: 288px; --measure: 38.5rem; --topbar-h: 56px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14130f;  --surface: #1c1b16;  --sunken: #1a1914;
    --ink: #ece7da;  --ink-2: #c9c3b4;  --muted: #938d7e;
    --line: #2b2921;  --line-2: #3a372c;
    --accent: #7cc4cb;  --accent-ink: #0d1a1c;  --accent-soft: #1b2d2f;
    --ok: #6cc38a;  --ok-soft: #1a2c20;  --bad: #ee8173;  --bad-soft: #321c18;  --warn-soft: #2e2813;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.3);
    --t-comment: #7d7766; --t-keyword: #d79ac8; --t-string: #8ccf9e; --t-number: #e5a56a;
    --t-func: #7fb2ec; --t-class: #e8a07a; --t-builtin: #7cc4cb; --t-op: #a29b8a; --t-deco: #e0b94f;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #14130f;  --surface: #1c1b16;  --sunken: #1a1914;
  --ink: #ece7da;  --ink-2: #c9c3b4;  --muted: #938d7e;
  --line: #2b2921;  --line-2: #3a372c;
  --accent: #7cc4cb;  --accent-ink: #0d1a1c;  --accent-soft: #1b2d2f;
  --ok: #6cc38a;  --ok-soft: #1a2c20;  --bad: #ee8173;  --bad-soft: #321c18;  --warn-soft: #2e2813;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.3);
  --t-comment: #7d7766; --t-keyword: #d79ac8; --t-string: #8ccf9e; --t-number: #e5a56a;
  --t-func: #7fb2ec; --t-class: #e8a07a; --t-builtin: #7cc4cb; --t-op: #a29b8a; --t-deco: #e0b94f;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: calc(var(--topbar-h) + 16px); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 16px/1.5 var(--sans); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
a { color: var(--accent); text-underline-offset: .18em; text-decoration-thickness: .06em; }
a:hover { text-decoration-thickness: .12em; }
img { max-width: 100%; }
code, pre, kbd { font-family: var(--mono); }
.muted { color: var(--muted); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 6px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* ---- top bar ---- */
.topbar { position: sticky; top: 0; z-index: 30; height: var(--topbar-h); display: flex; align-items: center; gap: 10px; padding: 0 20px; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid var(--line); }
.grow { flex: 1; }
.brand { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; color: var(--ink); font-weight: 650; letter-spacing: -.01em; }
.brand-mark { width: 30px; height: 30px; display: block; }
.brand-name { font-family: var(--serif); font-size: 1.25rem; font-weight: 600; }
.icon-btn { display: inline-grid; place-items: center; width: 36px; height: 36px; border: 0; border-radius: 8px; background: none; color: var(--ink-2); cursor: pointer; }
.icon-btn:hover { background: var(--sunken); }
.menu-btn { display: none; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 16px; border: 1px solid var(--line-2); border-radius: 9px; background: var(--surface); color: var(--ink); font: 500 .9rem/1.2 var(--sans); text-decoration: none; cursor: pointer; }
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.small { padding: 6px 12px; font-size: .82rem; }

/* ---- shell ---- */
.shell { display: block; }
body.has-side .shell { display: grid; grid-template-columns: var(--side-w) minmax(0, 1fr); }
.side { position: sticky; top: var(--topbar-h); align-self: start; height: calc(100vh - var(--topbar-h)); display: flex; flex-direction: column; border-right: 1px solid var(--line); background: var(--bg); }
.side-filter { padding: 14px 16px 8px; }
.side-filter input { width: 100%; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); font: inherit; font-size: .85rem; }
.side-scroll { overflow-y: auto; padding: 4px 8px 32px; flex: 1; scrollbar-width: thin; }
.side h2 { margin: 18px 10px 6px; font: 600 .68rem/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--muted); }
.side ul { list-style: none; margin: 0; padding: 0; }
.side li a { display: flex; align-items: baseline; gap: 6px; padding: 5px 10px; border-radius: 7px; color: var(--ink-2); text-decoration: none; font-size: .86rem; line-height: 1.35; }
.side li a:hover { background: var(--sunken); color: var(--ink); }
.side li a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); font-weight: 550; }
.trk summary { display: flex; align-items: baseline; gap: 8px; padding: 6px 10px; border-radius: 7px; cursor: pointer; font-size: .88rem; font-weight: 550; color: var(--ink); list-style: none; }
.trk summary::-webkit-details-marker { display: none; }
.trk summary::before { content: ""; width: 6px; height: 6px; border-right: 1.6px solid var(--muted); border-bottom: 1.6px solid var(--muted); transform: rotate(-45deg); transition: transform .15s; flex: none; align-self: center; }
.trk[open] > summary::before { transform: rotate(45deg); }
.trk summary:hover { background: var(--sunken); }
.trk ul { margin: 2px 0 8px 14px; padding-left: 6px; border-left: 1px solid var(--line); }
.tid { font: 600 .68rem/1 var(--mono); letter-spacing: .04em; color: var(--accent); }
.mid { font: 500 .72rem/1 var(--mono); color: var(--muted); flex: none; min-width: 1.6rem; }
.scrim { display: none; }

main { min-width: 0; padding: 0 clamp(18px, 4vw, 56px); }
.foot { margin: 72px 0 40px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
.page { display: grid; grid-template-columns: minmax(0, var(--measure)) 15rem; gap: 56px; justify-content: center; padding-top: 40px; }
.prose-wrap { min-width: 0; }
.page:not(:has(.toc)) { grid-template-columns: minmax(0, var(--measure)); }

/* ---- page heads ---- */
.eyebrow { margin: 0 0 10px; font: 600 .72rem/1.2 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.eyebrow a { color: inherit; text-decoration: none; }
.eyebrow a:hover { text-decoration: underline; }
.phead { margin-bottom: 22px; }
.phead h1 { margin: 0 0 14px; font: 600 clamp(2rem, 4.2vw, 2.9rem)/1.1 var(--serif); letter-spacing: -.022em; text-wrap: balance; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0 0 14px; padding: 0; }
.chips li { padding: 3px 10px; border: 1px solid var(--line); border-radius: 99px; background: var(--surface); color: var(--ink-2); font-size: .78rem; }
.world { margin: 0 0 16px; padding: 12px 16px; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; font: 400 1.02rem/1.55 var(--serif); color: var(--ink-2); }
.world b { font: 600 .72rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-right: 6px; }
.lede-s { font: 400 1.15rem/1.6 var(--serif); color: var(--ink-2); }

/* ---- tabs ---- */
.tabs { display: flex; gap: 2px; margin: 4px 0 30px; border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none; }
.tabs a { padding: 10px 14px; margin-bottom: -1px; border-bottom: 2px solid transparent; color: var(--muted); text-decoration: none; font-size: .9rem; font-weight: 500; white-space: nowrap; }
.tabs a:hover { color: var(--ink); }
.tabs a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); }
.count { margin-left: 4px; padding: 1px 7px; border-radius: 99px; background: var(--sunken); font-size: .72rem; color: var(--muted); }

/* ---- the reading experience ---- */
.prose { font: 400 1.2rem/1.72 var(--serif); font-optical-sizing: auto; color: var(--ink); hanging-punctuation: first; text-wrap: pretty; font-feature-settings: "kern", "liga", "onum"; }
.prose > :first-child { margin-top: 0; }
.prose p { margin: 0 0 1.15em; }
.prose h2, .prose h3, .prose h4 { font-family: var(--serif); font-weight: 600; line-height: 1.2; letter-spacing: -.014em; color: var(--ink); text-wrap: balance; }
.prose h2 { margin: 2.1em 0 .6em; font-size: 1.85rem; }
.prose h3 { margin: 1.8em 0 .5em; font-size: 1.4rem; }
.prose h4 { margin: 1.5em 0 .4em; font-size: 1.15rem; }
.prose strong { font-weight: 650; }
.prose em { font-style: italic; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.4em; }
.prose li { margin: .3em 0; padding-left: .2em; }
.prose li > p { margin-bottom: .5em; }
.prose li::marker { color: var(--muted); }
.prose hr { border: 0; margin: 2.6em auto; text-align: center; }
.prose hr::before { content: "· · ·"; letter-spacing: .6em; color: var(--muted); }
.prose a { text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.prose a.ext::after { content: "↗"; font: 500 .7em/1 var(--sans); margin-left: .15em; vertical-align: .25em; opacity: .7; }
.prose code { padding: .12em .38em; border: 1px solid var(--line); border-radius: 5px; background: var(--sunken); font-size: .8em; font-weight: 450; overflow-wrap: anywhere; }
.prose pre code { padding: 0; border: 0; background: none; font-size: inherit; font-weight: 400; overflow-wrap: normal; }
.prose blockquote { margin: 1.5em 0; padding: .9em 1.2em; border-left: 3px solid var(--accent); border-radius: 0 12px 12px 0; background: var(--accent-soft); font-size: 1.05rem; line-height: 1.62; color: var(--ink-2); }
.prose blockquote > :last-child { margin-bottom: 0; }
.prose blockquote p { margin-bottom: .7em; }
.prose blockquote strong:first-child { color: var(--accent); }
.prose table, .plain { display: block; max-width: 100%; margin: 1.6em 0; overflow-x: auto; border-collapse: collapse; font: 400 .92rem/1.5 var(--sans); }
.prose th, .prose td { padding: 9px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; min-width: 7rem; }
.prose th { font-weight: 600; font-size: .78rem; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); border-bottom: 1.5px solid var(--line-2); white-space: nowrap; }
.prose tbody tr:hover td { background: var(--sunken); }
.prose td code, .prose th code { font-size: .88em; }
.prose img { border-radius: 10px; }
.prose input[type=checkbox] { margin-right: .5em; accent-color: var(--accent); }
.prose .task-list-item { list-style: none; margin-left: -1.4em; }
.prose .footnotes { margin-top: 3em; font-size: .9rem; color: var(--muted); }

/* ---- code ---- */
pre.hl { position: relative; margin: 1.5em 0; padding: 18px 20px; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--sunken); color: var(--ink); font: 400 .84rem/1.65 var(--mono); tab-size: 4; font-variant-ligatures: none; scrollbar-width: thin; }
pre.hl[data-lang]::before { content: attr(data-lang); position: absolute; top: 7px; right: 14px; font: 600 .62rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); pointer-events: none; transition: opacity .15s; }
pre.hl:hover[data-lang]::before { opacity: 0; }
.copy { position: absolute; top: 6px; right: 8px; padding: 4px 9px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--surface); color: var(--ink-2); font: 500 .7rem/1 var(--sans); cursor: pointer; opacity: 0; transition: opacity .15s; }
pre.hl:hover .copy, .copy:focus-visible { opacity: 1; }
.hl span[class^="c"] { color: var(--t-comment); font-style: italic; }
.hl span[class^="k"], .hl .ow { color: var(--t-keyword); }
.hl span[class^="s"] { color: var(--t-string); }
.hl span[class^="m"] { color: var(--t-number); }
.hl .nf, .hl .fm { color: var(--t-func); }
.hl .nc, .hl .nn, .hl .ne { color: var(--t-class); }
.hl .nd, .hl .na { color: var(--t-deco); }
.hl .nb, .hl .bp, .hl .kc { color: var(--t-builtin); }
.hl .o, .hl .p { color: var(--t-op); }
.hl .nt { color: var(--t-keyword); }
figure.file { margin: 1.5em 0; }
figure.file figcaption { display: inline-block; margin-bottom: -1px; padding: 5px 12px; border: 1px solid var(--line); border-bottom: 0; border-radius: 8px 8px 0 0; background: var(--surface); font: 500 .76rem/1.3 var(--mono); color: var(--ink-2); position: relative; z-index: 1; }
figure.file pre.hl { margin-top: 0; border-top-left-radius: 0; }
.runbox { margin: 2.2em 0 1em; }
.runbox-h { font: 600 .68rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: -.9em; }
.runbox pre.hl { margin-top: 1.2em; background: var(--surface); }

/* ---- home ---- */
.hero { max-width: 70rem; margin: 0 auto; padding: clamp(36px, 8vh, 88px) 0 28px; }
.hero h1 { max-width: 56rem; margin: 0 0 20px; font: 600 clamp(2.5rem, 6.4vw, 4.6rem)/1.04 var(--serif); letter-spacing: -.03em; text-wrap: balance; }
.lede { max-width: 38rem; margin: 0 0 28px; font: 400 clamp(1.15rem, 2vw, 1.35rem)/1.6 var(--serif); color: var(--ink-2); }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; }
.section-h { margin: 2.4em 0 .7em; font: 600 .74rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; max-width: 70rem; margin: 0 auto; }
section > .section-h { max-width: 70rem; margin-left: auto; margin-right: auto; }
.card { display: flex; flex-direction: column; gap: 8px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); text-decoration: none; color: var(--ink); transition: border-color .15s, box-shadow .15s, transform .15s; }
.card:hover { border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-1px); }
.card-top { display: flex; justify-content: space-between; font-size: .78rem; }
.card-t { font: 600 1.3rem/1.2 var(--serif); letter-spacing: -.01em; }
.card-b { flex: 1; color: var(--ink-2); font: 400 .95rem/1.5 var(--serif); }
.card-f { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-top: 4px; font-size: .78rem; color: var(--muted); }

/* ---- lists ---- */
.modlist, .exlist { list-style: none; margin: 0 0 1em; padding: 0; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); overflow: hidden; }
.modlist li + li, .exlist li + li { border-top: 1px solid var(--line); }
.modlist a, .exlist a { display: grid; grid-template-columns: 2.6rem 1fr auto; align-items: center; gap: 4px 12px; padding: 13px 18px; text-decoration: none; color: var(--ink); }
.exlist a { grid-template-columns: 1fr auto; }
.modlist a:hover, .exlist a:hover { background: var(--sunken); }
.mnum { font: 600 .8rem/1 var(--mono); color: var(--muted); }
.mt { font: 500 1.05rem/1.35 var(--serif); }
.mm { color: var(--muted); font-size: .78rem; }
.exlist .mm { grid-column: 1 / 3; font-family: var(--mono); font-size: .72rem; }
.ex-h { margin: 0 0 18px; font: 600 1.7rem/1.2 var(--serif); letter-spacing: -.015em; }
.crumb { margin: 0 0 14px; font-size: .85rem; }
.note code, .world code { padding: .1em .34em; border: 1px solid var(--line-2); border-radius: 4px; background: var(--surface); font-size: .84em; }
.note { margin: 1.2em 0; padding: 12px 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--warn-soft); font: 400 1rem/1.55 var(--serif); }
details.hint { margin: 8px 0; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
details.hint summary { padding: 10px 16px; cursor: pointer; font-weight: 500; font-size: .9rem; }
details.hint p { margin: 0; padding: 0 16px 14px; font: 400 1.02rem/1.6 var(--serif); color: var(--ink-2); }

/* ---- toc ---- */
.toc { position: sticky; top: calc(var(--topbar-h) + 28px); align-self: start; max-height: calc(100vh - var(--topbar-h) - 56px); overflow-y: auto; font-size: .82rem; scrollbar-width: thin; }
.toc h2 { margin: 0 0 10px; font: 600 .68rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc a { display: block; padding: 4px 0 4px 14px; margin-left: -1px; border-left: 2px solid transparent; color: var(--muted); text-decoration: none; line-height: 1.4; }
.toc .l3 a { padding-left: 28px; }
.toc a:hover { color: var(--ink); }
.toc a.active { color: var(--accent); border-left-color: var(--accent); font-weight: 550; }

/* ---- pager ---- */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 56px; }
.pager a { display: block; padding: 14px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); color: var(--ink); text-decoration: none; font: 500 1rem/1.35 var(--serif); }
.pager a:hover { border-color: var(--accent); }
.pager a span { display: block; margin-bottom: 3px; font: 600 .68rem/1 var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.pager .next { text-align: right; grid-column: 2; }

/* ---- quiz ---- */
.quiz-score { position: sticky; top: calc(var(--topbar-h) + 8px); z-index: 5; margin: 0 0 16px; font-weight: 600; font-size: .9rem; }
.quiz-score:empty { display: none; }
.q { margin: 0 0 26px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.q fieldset { margin: 0 0 14px; padding: 0; border: 0; min-width: 0; }
.q legend { padding: 0; margin-bottom: 14px; font: 500 1.12rem/1.5 var(--serif); }
.q legend code, .opt code, .why code { padding: .1em .34em; border: 1px solid var(--line); border-radius: 4px; background: var(--sunken); font-size: .84em; }
.qn { display: inline-grid; place-items: center; width: 24px; height: 24px; margin-right: 10px; border-radius: 50%; background: var(--sunken); font: 600 .75rem/1 var(--sans); }
.opt { display: flex; gap: 12px; align-items: baseline; padding: 10px 14px; margin: 6px 0; border: 1px solid var(--line); border-radius: 10px; cursor: pointer; font: 400 1.02rem/1.5 var(--serif); }
.opt:hover { border-color: var(--line-2); background: var(--sunken); }
.opt input { margin: 0; accent-color: var(--accent); transform: translateY(1px); }
.key { flex: none; font: 600 .75rem/1 var(--mono); color: var(--muted); }
.opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.q[data-done] .opt { cursor: default; }
.why { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line-2); font: 400 1.02rem/1.6 var(--serif); color: var(--ink-2); }
.why p { margin: 0 0 8px; } .src { font: .8rem/1.4 var(--sans); overflow-wrap: anywhere; }

/* ---- responsive ---- */
@media (max-width: 1180px) { .page { grid-template-columns: minmax(0, var(--measure)); } .toc { display: none; } }
@media (max-width: 900px) {
  body.has-side .shell { display: block; }
  .menu-btn { display: inline-grid; }
  .side { position: fixed; z-index: 40; top: var(--topbar-h); left: 0; width: min(86vw, 320px); transform: translateX(-102%); transition: transform .2s ease; box-shadow: var(--shadow); }
  body.menu-open .side { transform: none; }
  body.menu-open .scrim { display: block; position: fixed; inset: var(--topbar-h) 0 0 0; z-index: 35; background: rgba(0,0,0,.35); }
  .topbar { padding: 0 12px; }
  .prose { font-size: 1.1rem; }
  .page { padding-top: 28px; gap: 0; }
  .pager { grid-template-columns: 1fr; } .pager .next { grid-column: 1; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }
@media print { .topbar, .side, .toc, .pager, .copy, .foot { display: none !important; } body.has-side .shell { display: block; } .prose { font-size: 11pt; } }

/* Roadmap: a vertical line of tracks, modules branching left and right */
.rm { max-width: 62rem; margin: 0 auto; padding: 8px 0 60px; }
.rm-head { text-align: center; max-width: 40rem; margin: 0 auto 36px; }
.rm-head h1 { font: 600 clamp(1.8rem, 4vw, 2.5rem)/1.15 var(--serif); letter-spacing: -.02em; margin: .2em 0 .4em; }
.rm-legend { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px 16px; font-size: .8rem; color: var(--muted); }
.rm-key { display: inline-block; width: 14px; height: 14px; border-radius: 4px; border: 2px solid var(--accent); vertical-align: -2px; margin-right: 4px; }
.rm-key-track { background: var(--accent); }
.rm-key-mod { background: var(--surface); }
.rm-key-byo { background: var(--warn-soft); border-color: #c79a1c; border-style: dashed; }
.rm-key-done { background: var(--ok); border-color: var(--ok); }
.rm-progress { display: flex; justify-content: center; align-items: center; gap: 10px; font-size: .9rem; color: var(--ink-2); }
.rm-bar { width: 160px; height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; }
.rm-bar-fill { display: block; height: 100%; background: var(--ok); transition: width .25s; }
.rm-bar-fill.p0 { width: 0%; }
.rm-bar-fill.p5 { width: 5%; }
.rm-bar-fill.p10 { width: 10%; }
.rm-bar-fill.p15 { width: 15%; }
.rm-bar-fill.p20 { width: 20%; }
.rm-bar-fill.p25 { width: 25%; }
.rm-bar-fill.p30 { width: 30%; }
.rm-bar-fill.p35 { width: 35%; }
.rm-bar-fill.p40 { width: 40%; }
.rm-bar-fill.p45 { width: 45%; }
.rm-bar-fill.p50 { width: 50%; }
.rm-bar-fill.p55 { width: 55%; }
.rm-bar-fill.p60 { width: 60%; }
.rm-bar-fill.p65 { width: 65%; }
.rm-bar-fill.p70 { width: 70%; }
.rm-bar-fill.p75 { width: 75%; }
.rm-bar-fill.p80 { width: 80%; }
.rm-bar-fill.p85 { width: 85%; }
.rm-bar-fill.p90 { width: 90%; }
.rm-bar-fill.p95 { width: 95%; }
.rm-bar-fill.p100 { width: 100%; }
.rm-track { position: relative; display: flex; flex-direction: column; align-items: center; padding-top: 26px; }
.rm-track::before { content: ""; position: absolute; top: 0; height: 26px; left: 50%; border-left: 2px solid var(--accent); }
.rm-node { display: flex; align-items: center; gap: 10px; padding: 10px 14px; border: 2px solid var(--accent); border-radius: 10px; background: var(--surface); color: var(--ink); text-decoration: none; transition: background .15s, box-shadow .15s, transform .15s; }
.rm-node:hover { box-shadow: var(--shadow); transform: translateY(-1px); background: var(--accent-soft); }
.rm-track-node { position: relative; z-index: 1; flex-direction: column; gap: 2px; min-width: 18rem; padding: 14px 24px; text-align: center; background: var(--accent); color: var(--accent-ink); }
.rm-track-node:hover { background: var(--accent); filter: brightness(1.1); }
.rm-tid { font: 600 .72rem/1 var(--sans); letter-spacing: .14em; opacity: .8; }
.rm-tname { font: 600 1.25rem/1.2 var(--serif); }
.rm-thours { font-size: .78rem; opacity: .8; }
.rm-mods { position: relative; list-style: none; margin: 0; padding: 22px 0 6px; width: 100%; }
.rm-mods::before { content: ""; position: absolute; top: 0; bottom: 0; left: 50%; border-left: 2px solid var(--accent); }
.rm-m { position: relative; display: flex; align-items: center; gap: 8px; width: calc(50% - 34px); margin: 0 0 14px; }
.rm-m.l { flex-direction: row-reverse; margin-right: auto; }
.rm-m.r { margin-left: auto; }
.rm-m::after { content: ""; position: absolute; top: 50%; width: 34px; border-top: 2px dashed var(--accent); }
.rm-m.l::after { left: 100%; }
.rm-m.r::after { right: 100%; }
.rm-m .rm-node { flex: 1; min-width: 0; }
.rm-mid { flex: none; font: 600 .74rem/1 var(--mono); color: var(--accent); }
.rm-mt { flex: 1; font: 500 .92rem/1.3 var(--sans); }
.rm-mh { flex: none; font-size: .74rem; color: var(--muted); }
.rm-m.byo .rm-node { background: var(--warn-soft); border: 2px dashed #c79a1c; }
.rm-m.byo .rm-mid { color: #8a6a00; }
.rm-done { flex: none; width: 24px; height: 24px; padding: 0; border: 2px solid var(--line-2); border-radius: 50%; background: var(--surface); cursor: pointer; position: relative; }
.rm-done:hover { border-color: var(--ok); }
.rm-done[aria-pressed="true"] { background: var(--ok); border-color: var(--ok); }
.rm-done[aria-pressed="true"]::after { content: ""; position: absolute; left: 6px; top: 2px; width: 6px; height: 11px; border: solid #fff; border-width: 0 2px 2px 0; transform: rotate(45deg); }
.rm-m.is-done .rm-node { border-color: var(--ok); background: var(--ok-soft); }
.rm-m.is-done .rm-mt { text-decoration: line-through; text-decoration-color: var(--muted); }
.rm-end { text-align: center; color: var(--muted); font: italic 1rem/1.4 var(--serif); margin-top: 28px; }
@media (max-width: 700px) {
  .rm-track { align-items: stretch; }
  .rm-track::before, .rm-mods::before { left: 8px; }
  .rm-track-node { min-width: 0; }
  .rm-mods { padding-left: 24px; }
  .rm-m, .rm-m.l, .rm-m.r { width: 100%; flex-direction: row; margin: 0 0 12px; }
  .rm-m::after, .rm-m.l::after, .rm-m.r::after { left: -24px; right: auto; width: 24px; }
}

.side a.is-done::after { content: "\2713"; margin-left: 6px; color: var(--ok); font-weight: 600; }
.mark-done { margin: 4px 0 10px; }
.mark-done[aria-pressed="true"] { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }

/* Course diagrams: inline SVG from <module>/diagrams/*.svg, themed through these classes */
.diagram { margin: 1.6em 0; padding: 14px 14px 10px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.diagram svg { display: block; width: 100%; height: auto; max-width: 760px; margin: 0 auto; font-family: var(--sans); font-size: 14px; }
.diagram figcaption { margin-top: 8px; text-align: center; font: 400 .85rem/1.4 var(--sans); color: var(--muted); }
.diagram .dg-ctrl { display: flex; justify-content: center; gap: 8px; margin-top: 8px; }
.diagram .dg-ctrl button { font: 500 .78rem/1 var(--sans); padding: 6px 12px; border: 1px solid var(--line-2); border-radius: 99px; background: var(--sunken); color: var(--ink-2); cursor: pointer; }
.diagram .dg-ctrl button:hover { border-color: var(--accent); color: var(--accent); }
.dg-box { fill: var(--surface); stroke: var(--ink-2); stroke-width: 1.5; }
.dg-accent { fill: var(--accent-soft); stroke: var(--accent); stroke-width: 1.5; }
.dg-ok { fill: var(--ok-soft); stroke: var(--ok); stroke-width: 1.5; }
.dg-bad { fill: var(--bad-soft); stroke: var(--bad); stroke-width: 1.5; }
.dg-warn { fill: var(--warn-soft); stroke: #b8860b; stroke-width: 1.5; }
.dg-text { fill: var(--ink); }
.dg-muted { fill: var(--muted); font-size: 12px; }
.dg-mono { font-family: var(--mono); }
.dg-b { font-weight: 600; }
.dg-line { fill: none; stroke: var(--ink-2); stroke-width: 1.5; }
.dg-dash { stroke-dasharray: 5 4; }
.dg-head { fill: var(--ink-2); }
.dg-dot { fill: var(--accent); }
.dg-dot-bad { fill: var(--bad); }
.dg-dot-ok { fill: var(--ok); }