/* AMSS 2026/2027: styles for the course page (static/index.html) and for the
   continuous documents built with theme/doc.html (Lab 0, the project page).
   The palette comes from the course logo; the layout vocabulary follows the
   instructor's homepage. Slide decks use theme/deck.css. */

:root {
  --bg: #ffffff;
  --surface: #f3f7f8;
  --text: #1d2a2e;
  --muted: #4a5a60;
  --line: #d5e0e3;
  --brand: #0a2145;          /* logo navy; headings */
  --accent: #087373;         /* logo teal; 5.6:1 on --bg */
  --accent-strong: #065a5a;
  --header-bg: #0a2145;
  --header-text: #ffffff;
  --header-accent: #8fd6d2;
  --focus: #b35c00;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, "DejaVu Sans", sans-serif;
  --mono: ui-monospace, Consolas, "Cascadia Mono", "DejaVu Sans Mono", "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11181b;
    --surface: #182125;
    --text: #e8eff1;
    --muted: #a9b9be;
    --line: #2b3a3f;
    --brand: #f2f6f7;
    --accent: #6fcac6;       /* 9.4:1 on --bg */
    --accent-strong: #a5e3df;
    --header-bg: #0b1a33;
    --focus: #ffb454;
  }
  /* The band and the page are close in tone; mark the edge. */
  .site-header, .doc-bar { border-bottom: 1px solid var(--line); }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-padding-top: 1rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.6 var(--sans);
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { color: var(--accent-strong); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 2px; }

code, pre, kbd, samp { font-family: var(--mono); }
button, input, select, textarea { font-family: inherit; }

.wrap { max-width: 64rem; margin: 0 auto; padding: 0 1.25rem; }

.skip-link {
  position: absolute; left: 0.5rem; top: -4rem; z-index: 10;
  padding: 0.6rem 1rem;
  border: 2px solid var(--focus); border-radius: 0.4rem;
  background: var(--bg); color: var(--text);
}
.skip-link:focus { top: 0.5rem; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}

/* Numeric ranges such as 10–12 stay on one line (theme/amss.lua marks them). */
.nowrap { white-space: nowrap; }

/* ---------- header of the course page ---------- */

.site-header { background: var(--header-bg); color: var(--header-text); }
.site-header a { color: inherit; }
.site-header a:hover { color: inherit; text-decoration-thickness: 3px; }
.site-header :focus-visible { outline-color: #ffffff; }

/* On a phone the logo shares a line with the edition, so the header stays short. */
.intro {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.6rem 0.9rem;
  align-items: center;
  padding-top: 1.1rem;
  padding-bottom: 1.25rem;
}
.intro > div { display: contents; }
.intro .logo {
  width: 3.5rem; height: auto;
  padding: 0.2rem;
  border-radius: 0.5rem;
  background: #ffffff;
}
.intro h1 {
  grid-column: 1 / -1;
  margin: 0;
  font-size: clamp(1.75rem, 5.2vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.intro p { margin: 0; }
.intro .edition { color: var(--header-accent); font-weight: 600; }
.intro .tagline { grid-column: 1 / -1; font-size: 1rem; line-height: 1.4; opacity: 0.95; }

.site-header nav { background: rgba(0, 0, 0, 0.22); }
.site-header nav ul { display: flex; flex-wrap: wrap; gap: 0 0.05rem; margin: 0 0 0 -0.6rem; padding: 0; list-style: none; }
.site-header nav a { display: inline-block; min-height: 2.75rem; padding: 0.7rem 0.6rem; font-weight: 600; text-decoration: none; }
.site-header nav a:hover { text-decoration: underline; }
.site-header nav a:focus-visible { outline-offset: -5px; }

@media (min-width: 40rem) {
  .intro { gap: 2rem; padding-top: 2.5rem; padding-bottom: 2.5rem; }
  .intro > div { display: block; }
  .intro .logo { width: 9.5rem; padding: 0.5rem; border-radius: 0.75rem; }
  .intro .edition { margin-bottom: 0.35rem; }
  .intro .tagline { margin-top: 0.6rem; font-size: 1.1rem; }
}

/* ---------- sections of the course page ---------- */

.home main { padding-bottom: 3rem; }
.home section { padding-top: 2.5rem; }
.home h2 {
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--line);
  color: var(--brand);
  font-size: 1.5rem;
  line-height: 1.25;
}
.home p { margin: 0.5rem 0; }
.home .lead { max-width: 38rem; color: var(--muted); }

/* The semester: each row pairs two lectures with the lab that follows them. */
.schedule { width: 100%; margin-top: 1rem; border-collapse: collapse; }
.schedule th {
  padding: 0 0 0.5rem 2.3rem;            /* in line with the titles below */
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
  text-align: left;
}
.schedule th + th { padding-left: 4.3rem; }
.schedule td { padding: 0.7rem 0; border-top: 1px solid var(--line); vertical-align: top; }
.schedule td + td { padding-left: 2rem; }
.schedule ol { margin: 0; padding: 0 0 0 2.1rem; }
.schedule li { padding: 0.15rem 0 0.15rem 0.2rem; }
.schedule li::marker { color: var(--muted); font-variant-numeric: tabular-nums; }
.schedule li.locked { color: var(--muted); }
.schedule .format {
  display: inline-block;
  min-width: 2.75rem;
  margin-left: 0.4rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 0.3rem;
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
}
.schedule .format:hover { border-color: currentColor; }
.schedule .note { display: block; color: var(--muted); font-size: 0.9rem; }

@media print, (min-width: 48rem) {
  .schedule th:first-child, .schedule td:first-child { width: 54%; }
}
@media screen and (min-width: 48rem) and (max-width: 59.99rem) {
  .schedule th:first-child, .schedule td:first-child { width: 50%; }
}
@media screen and (max-width: 47.99rem) {
  .schedule thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .schedule, .schedule tbody, .schedule tr, .schedule td { display: block; }
  .schedule tr { padding: 0.7rem 0; border-top: 1px solid var(--line); }
  .schedule td { padding: 0; border: 0; }
  .schedule td + td {
    margin: 0.5rem 0 0 0.6rem;
    padding: 0.5rem 0.75rem;
    border-left: 3px solid var(--accent);
    border-radius: 0 0.4rem 0.4rem 0;
    background: var(--surface);
  }
  .schedule td + td::before {
    content: "Laborator";
    display: block;
    color: var(--muted);
    font-size: 0.85rem;
    font-weight: 600;
  }
}

/* Label on the left, details on the right, as in the homepage's entries. */
.facts { margin: 0; }
.facts > div { padding: 1rem 0; border-bottom: 1px solid var(--line); }
.facts > div:last-child { border-bottom: 0; }
/* The section links often cannot scroll any further; mark where they point. */
.facts > div:target { box-shadow: -0.75rem 0 0 var(--bg), -1rem 0 0 var(--accent); }
.facts dt { color: var(--brand); font-weight: 700; }
.facts dd { margin: 0.2rem 0 0; }
.facts dd > :first-child { margin-top: 0; }
.facts dd > :last-child { margin-bottom: 0; }
.facts dd > p { max-width: 38rem; }
.facts ul { margin: 0.4rem 0; padding-left: 1.25rem; }
.facts li + li { margin-top: 0.25rem; }
.facts li::marker { color: var(--accent); }

@media (min-width: 40rem) {
  .facts > div { display: grid; grid-template-columns: 11rem 1fr; gap: 0 1.5rem; }
  .facts dd { margin-top: 0; }
}

.points { border-collapse: collapse; font-variant-numeric: tabular-nums; }
.points th, .points td { padding: 0.2rem 0; border-bottom: 1px solid var(--line); font-weight: 400; text-align: left; }
.points td { padding-left: 2rem; text-align: right; white-space: nowrap; }
.points tr:first-child > * { padding-top: 0; }
.points tr:last-child th, .points tr:last-child td { border-bottom: 0; }

code.join { padding: 0.1rem 0.4rem; border-radius: 0.3rem; background: var(--surface); font-size: 0.95em; font-weight: 700; }

/* The rule is drawn inside the side padding that .wrap provides. */
.site-footer { margin-top: 1rem; padding-bottom: 2.5rem; color: var(--muted); font-size: 0.95rem; }
.site-footer::before { content: ""; display: block; margin-bottom: 1.5rem; border-top: 1px solid var(--line); }
.site-footer p { margin: 0.2rem 0; }

/* ---------- continuous documents (theme/doc.html) ---------- */

.doc-bar { background: var(--header-bg); color: var(--header-text); }
.doc-bar .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem 1rem; min-height: 3.25rem; padding-top: 0.5rem; padding-bottom: 0.5rem; }
.doc-bar a { display: inline-flex; align-items: center; gap: 0.6rem; color: inherit; font-weight: 700; text-decoration: none; }
.doc-bar a:hover { color: inherit; text-decoration: underline; }
.doc-bar a::before {
  content: "";
  width: 2rem; height: 2rem;
  border-radius: 0.35rem;
  background: #ffffff url("assets/amss-2026-mark-64.png") center / 1.7rem no-repeat;
}
.doc-bar .course { color: var(--header-accent); font-size: 0.95rem; }
.doc-bar :focus-visible { outline-color: #ffffff; }

.doc main { padding-top: 2.25rem; padding-bottom: 2rem; }
.doc-layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0 3rem; }
.doc-layout > * { min-width: 0; max-width: 40rem; }
.prose { font-size: 1.0625rem; line-height: 1.65; overflow-wrap: break-word; }

.doc-title { margin-bottom: 1.75rem; padding-bottom: 1.25rem; border-bottom: 2px solid var(--line); }
.doc-title .session { margin: 0 0 0.3rem; color: var(--accent); font-size: 1.1rem; font-weight: 700; }
.doc-title h1 {
  margin: 0;
  color: var(--brand);
  font-size: clamp(1.9rem, 5.5vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.doc-title .byline { margin: 0.9rem 0 0; color: var(--muted); font-size: 0.95rem; }
.doc-title .formats { margin: 0.3rem 0 0; font-size: 0.95rem; font-weight: 600; }

.prose h2 { margin: 2.4rem 0 0.7rem; color: var(--brand); font-size: 1.45rem; line-height: 1.25; letter-spacing: -0.005em; text-wrap: balance; }
.prose h3 { margin: 2rem 0 0.5rem; color: var(--brand); font-size: 1.2rem; line-height: 1.3; }
.prose h4 { margin: 1.5rem 0 0.4rem; color: var(--brand); font-size: 1rem; }
.prose p { margin: 0 0 1rem; }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.5rem; }
.prose li + li { margin-top: 0.3rem; }
.prose li > ul, .prose li > ol { margin: 0.3rem 0 0; }
.prose ul > li::marker { color: var(--accent); }
.prose ol > li::marker { color: var(--accent); font-weight: 700; font-variant-numeric: tabular-nums; }
.prose strong { color: var(--brand); }
.prose hr { margin: 2rem 0; border: 0; border-top: 1px solid var(--line); }
.prose img { max-width: 100%; height: auto; }

.prose blockquote { margin: 0 0 1rem; padding: 0.1rem 0 0.1rem 1rem; border-left: 0.25rem solid var(--accent); }
.prose blockquote > :last-child { margin-bottom: 0; }

/* The epigraph ("Ideea întâlnirii"): a quiet label, then quotation, author, source. */
.prose h2.epigraph { margin-bottom: 0.6rem; color: var(--muted); font-size: 1.05rem; letter-spacing: 0; }
.prose .epigraph + blockquote { color: var(--brand); font-size: 1.4rem; font-weight: 600; line-height: 1.3; text-wrap: balance; }
.prose .epigraph + blockquote + p { margin-bottom: 0.2rem; }
.prose .epigraph + blockquote + p + p { color: var(--muted); font-size: 0.9rem; }

/* Tables with column widths carry their own width: 100% from pandoc; the
   others are as wide as their content. */
.table-wrap { margin: 0 0 1.25rem; overflow-x: auto; }
.prose table { width: auto; min-width: min(100%, 22rem); border-collapse: collapse; font-size: 0.95rem; line-height: 1.45; font-variant-numeric: tabular-nums; }
.prose th, .prose td { padding: 0.5rem 1rem 0.5rem 0; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.prose th:last-child, .prose td:last-child { padding-right: 0; }
.prose thead th { border-bottom: 2px solid var(--brand); color: var(--brand); }
.prose caption { margin-bottom: 0.4rem; color: var(--muted); text-align: left; }

/* The grading rubric on a phone: criterion and points on one line, the
   description below (the table is marked in the source, see theme/amss.lua). */
@media (max-width: 36rem) {
  .rubric thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  .rubric table, .rubric tbody { display: block; width: 100%; }
  .rubric tr { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.25rem 1rem; padding: 0.75rem 0; border-bottom: 1px solid var(--line); }
  .rubric tr:first-child { border-top: 2px solid var(--brand); }
  .rubric td { display: block; padding: 0; border: 0; }
  .rubric td:nth-child(2)::after { content: " p."; color: var(--muted); font-weight: 400; }
  .rubric td:nth-child(3) { grid-column: 1 / -1; font-size: 1rem; }
}

.prose code { padding: 0.1em 0.25em; border-radius: 0.25em; background: var(--surface); font-size: 0.9em; }
/* The code panel is the element that takes the focus (theme/amss.lua): the
   wrapper pandoc adds around highlighted code, or else the pre itself. */
.prose pre, .prose div.sourceCode {
  margin: 0 0 1.1rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  background: var(--surface);
}
.prose pre { padding: 0.8rem 1rem; font-size: 0.9rem; line-height: 1.5; }
.prose pre code { padding: 0; background: none; font-size: 1em; }
.prose div.sourceCode > pre { margin: 0; overflow: visible; border: 0; background: none; }
@media (max-width: 36rem) {
  /* Notes templates are prose: wrap them instead of scrolling sideways. */
  .prose pre.markdown > code.sourceCode { white-space: pre-wrap; }
}

/* Pandoc puts the checkbox inside a label. */
.prose ul.task-list { padding-left: 0; }
.prose ul.task-list li { display: block; }
.prose ul.task-list label { display: flex; gap: 0.6rem; align-items: baseline; }
.prose ul.task-list input[type="checkbox"] { flex: none; width: 1.05rem; height: 1.05rem; margin: 0; accent-color: var(--accent); transform: translateY(0.15rem); }

/* The outline: a collapsed box under the title, or a column beside the text. */
.doc-toc { margin: 0 0 1.75rem; border: 1px solid var(--line); border-radius: 0.5rem; font-size: 0.95rem; line-height: 1.4; }
.doc-toc summary { padding: 0.7rem 1rem; color: var(--muted); font-weight: 700; cursor: pointer; }
.doc-toc nav { padding: 0 1rem 0.6rem; }
.doc-toc ul { margin: 0; padding: 0; list-style: none; }
.doc-toc ul ul { display: none; }
.doc-toc a { display: block; padding: 0.35rem 0; text-decoration: none; }
.doc-toc a:hover { text-decoration: underline; }

@media (min-width: 45rem) and (max-width: 61.99rem) {
  /* One column, centred, until there is room for the outline beside it. */
  .doc main.wrap, .doc .site-footer, .doc .doc-bar .wrap { max-width: 42.5rem; }
}

@media (min-width: 62rem) {
  .doc-layout { grid-template-columns: minmax(0, 40rem) minmax(0, 1fr); grid-template-rows: auto 1fr; }
  .doc-title { grid-column: 1; grid-row: 1; }
  .doc-layout > .prose { grid-column: 1; grid-row: 2; }
  .doc-toc {
    grid-column: 2; grid-row: 1 / span 2;
    position: sticky; top: 1.5rem; align-self: start;
    max-height: calc(100vh - 3rem); overflow-y: auto;
    margin: 0;
    padding: 0.5rem 0.5rem 0.5rem 0;      /* room for focus rings inside the scroller */
    border: 0; border-left: 2px solid var(--line); border-radius: 0;
  }
  .doc-toc summary { margin-left: 1.1rem; padding: 0 0 0.5rem; }
  .doc-toc nav { padding: 0 0 0 1.1rem; }
  .doc-toc a { padding: 0.22rem 0; }
  .doc-toc :focus-visible { outline-offset: 2px; }
}

/* Pandoc's syntax colours assume a light page. */
@media (prefers-color-scheme: dark) {
  .prose code span { color: inherit; }
  .prose code span.kw, .prose code span.cf, .prose code span.im, .prose code span.ot { color: #7fc8e8; }
  .prose code span.fu, .prose code span.bu, .prose code span.ex { color: #a9c7ff; }
  .prose code span.st, .prose code span.ch, .prose code span.vs, .prose code span.sc { color: #a8d8a0; }
  .prose code span.co, .prose code span.an, .prose code span.cv, .prose code span.do { color: #9aabb0; }
  .prose code span.dv, .prose code span.fl, .prose code span.bn, .prose code span.cn { color: #f0b98d; }
  .prose code span.at, .prose code span.va, .prose code span.dt { color: #d7c58a; }
}

@media (prefers-contrast: more) {
  :root { --muted: var(--text); --line: currentColor; }
}

@media (forced-colors: active) {
  /* Keep the white plate behind the logo, whose wordmark is dark. */
  .intro .logo, .doc-bar a::before { forced-color-adjust: none; }
}

@media print {
  :root { --bg: #ffffff; --surface: #f3f7f8; --text: #000000; --muted: #333333; --line: #999999; --brand: #0a2145; --accent: #065a5a; }
  body { font-size: 10.5pt; }
  .site-header, .doc-bar { background: none; color: #000000; border-bottom: 2px solid #000000; }
  .site-header nav, .skip-link, .doc-toc, .doc-title .formats { display: none; }
  .intro .edition { color: #000000; }
  .doc-bar .course { color: #000000; }
  a { color: #000000; }
  .prose a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 0.85em; overflow-wrap: anywhere; }
  .prose a[href*="teams."]::after { content: none; }   /* the address is three lines long */
  .prose { max-width: none; font-size: inherit; }
  h2, h3 { break-after: avoid; }
  pre, table, blockquote, .site-footer { break-inside: avoid; }
  .schedule { break-inside: auto; }
  .schedule tr { break-inside: avoid; }
}