/* T2 deck theme: light, high-contrast, projector-friendly. System fonts only (works offline).
   Colours: ink for text, one blue accent for links and emphasis, warm orange for "caution" points. */
:root {
  --ink: #1d2733;
  --muted: #5b6776;
  --accent: #1f5f99;
  --caution: #b45309;
  --panel: #f2f5f8;
  --rule: #d8dee6;
  --bg: #ffffff;
  --font: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.reveal-viewport { background: var(--bg); }
.reveal { font-family: var(--font); font-size: 30px; color: var(--ink); }

.reveal .slides section {
  box-sizing: border-box;
  height: 100%;
  padding: 30px 56px 62px;
  text-align: left;
}

.reveal h1, .reveal h2, .reveal h3 {
  font-family: var(--font);
  color: var(--ink);
  text-transform: none;
  letter-spacing: -0.01em;
  font-weight: 700;
  line-height: 1.15;
  text-wrap: balance;
}
.reveal h1 { font-size: 2.3em; margin: 0 0 0.3em; }
.reveal h2 { font-size: 1.5em; margin: 0 0 0.55em; }
.reveal h3 { font-size: 1em; margin: 0 0 0.3em; }
.reveal p { margin: 0 0 0.6em; line-height: 1.4; }
.reveal ul { display: block; margin: 0 0 0 1.1em; }
.reveal li { line-height: 1.4; }
.reveal li + li { margin-top: 0.45em; }
.reveal li ul { margin-top: 0.3em; font-size: 0.9em; }
.reveal ul + p, .reveal .cols + p { margin-top: 0.9em; }
.reveal a { color: var(--accent); }
/* reveal's reset.css flattens sub/sup; restore them (line-height 0 keeps line spacing even). */
.reveal sub, .reveal sup { font-size: 0.7em; line-height: 0; position: relative; }
.reveal sub { vertical-align: sub; }
.reveal sup { vertical-align: super; }
.reveal b, .reveal strong { font-weight: 700; }
.reveal .hl { color: var(--accent); font-weight: 700; }
.reveal .caution { color: var(--caution); font-weight: 700; }
.reveal .muted { color: var(--muted); }
.reveal .small { font-size: 0.78em; }
.reveal .cite { color: var(--muted); font-size: 0.8em; white-space: nowrap; }

/* Title and section-divider slides: content sits in a vertically centred column. */
.reveal .center-col { height: 100%; display: flex; flex-direction: column; justify-content: center; }
.reveal .kicker { font-size: 0.62em; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); margin-bottom: 0.4em; }
/* Exercise problem slides: the qMRLab logo and the course name above the kicker. */
.reveal .brand { display: flex; align-items: center; gap: 0.45em; margin-bottom: 0.7em; font-size: 0.78em; font-weight: 700; }
.reveal .brand img { height: 1.5em; width: auto; margin: 0; }
.reveal .subtitle { font-size: 1.05em; color: var(--muted); }
.reveal .byline { font-size: 0.66em; color: var(--muted); margin-top: 2.2em; }
.reveal section.divider h1 { font-size: 2.2em; }
.reveal section.divider .subtitle { max-width: 34em; }

/* Equations */
.reveal .eq { margin: 0.5em 0; font-size: 1.1em; }
.reveal .eq-note { font-size: 0.78em; color: var(--muted); }
.reveal .eq-box { background: var(--panel); border-radius: 10px; padding: 0.35em 0.8em; margin: 0.4em 0 0.7em; }
.reveal .katex-display { margin: 0.35em 0; }
.reveal .eq-small { font-size: 0.72em; margin: 0.6em 0 0.9em; }

/* Two columns */
.reveal .cols { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.reveal .cols > * { min-width: 0; }

/* Cards (the chapter's three topics) */
.reveal .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-top: 0.4em; }
.reveal .card { background: var(--panel); border-radius: 12px; padding: 22px 24px; font-size: 0.8em; border-top: 6px solid var(--card); }
.reveal .card h3 { font-size: 1.45em; margin-bottom: 0.5em; }
.reveal .card p { margin-bottom: 0.5em; }
.reveal .card.mono { --card: #0072b2; }
.reveal .card.multi { --card: #e69f00; }
.reveal .card.t2star { --card: #009e73; }

/* Images (pulse sequences) */
.reveal .pulse img { display: block; margin: 0.8em auto 0; max-width: 100%; max-height: 470px; }
.reveal .caption { font-size: 0.72em; color: var(--muted); text-align: center; margin-top: 0.8em; }

/* Book figures: the host fills the space under the title; deck.js scales the figure to fit. */
/* Reveal sets an inline display on <section>, so the column layout lives on an inner wrapper. */
.reveal section.figure { padding-top: 16px; padding-bottom: 48px; }
.reveal .fig-layout { height: 100%; display: flex; flex-direction: column; }
.reveal section.figure h2 { font-size: 1.15em; margin-bottom: 0.3em; flex: none; }
.reveal .fig-hint { flex: none; }
/* Square figures: title and hint in a left column so the figure can use the full slide height. */
.reveal section.figure.side .fig-layout { display: grid; grid-template-columns: 300px 1fr; grid-template-rows: auto 1fr; column-gap: 32px; }
.reveal section.figure.side h2 { grid-column: 1; grid-row: 1; margin-top: 0.6em; }
.reveal section.figure.side .fig-hint { grid-column: 1; grid-row: 2; text-align: left; font-size: 0.6em; }
.reveal section.figure.side .fig-host { grid-column: 2; grid-row: 1 / span 2; }
.reveal .fig-host { flex: 1; min-height: 0; display: flex; justify-content: center; align-items: flex-start; }
.reveal .fig-frame { position: relative; flex: none; }
.reveal .fig-plot { position: absolute; top: 0; left: 0; transform-origin: 0 0; }
.reveal .fig-hint { font-size: 0.55em; color: var(--muted); text-align: center; margin: 0.2em 0 0; }
.reveal .fig-fallback { align-self: center; background: var(--panel); border-radius: 10px; padding: 1em 1.4em; font-size: 0.75em; }

/* Link back to the book: same place on every slide. */
.reveal .book-link {
  position: absolute;
  left: 56px;
  bottom: 18px;
  font-size: 17px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
}
.reveal .book-link:hover, .reveal .book-link:focus-visible { color: var(--accent); }
.reveal .pop-out {
  position: fixed;
  top: 10px;
  right: 12px;
  z-index: 40;
  font-size: 14px;
  padding: 5px 10px;
  border-radius: 6px;
  background: var(--panel);
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--rule);
}
.reveal .pop-out:hover, .reveal .pop-out:focus-visible { background: var(--bg); }
.reveal .slide-number { font-family: var(--font); background: transparent; color: var(--muted); font-size: 15px; right: 18px; bottom: 14px; }
.reveal .controls { color: var(--accent); }
.reveal .progress { color: var(--accent); }

/* ---------------------------------------------------------------- Exercise slides */
/* Question and controls on the left, a book or computed figure on the right. */
.reveal section.ex { padding-top: 22px; padding-bottom: 50px; }
.reveal .ex-layout { height: 100%; display: flex; flex-direction: column; }
.reveal .ex-layout > h2 { flex: none; font-size: 1.15em; margin-bottom: 0.4em; }
.reveal .ex-cols { flex: 1; min-height: 0; display: grid; grid-template-columns: 0.85fr 1.15fr; column-gap: 36px; }
.reveal .ex-cols > * { min-width: 0; min-height: 0; }
/* Book figures are wide (e.g. 600 × 350): give them more of the slide. */
.reveal .ex-cols:has(> .fig-host) { grid-template-columns: 0.7fr 1.3fr; }
.reveal .ex-text { font-size: 0.7em; }
.reveal .ex-text p { margin-bottom: 0.5em; }
.reveal .ex-cols .fig-host, .reveal .result-host { height: 100%; display: flex; justify-content: center; align-items: flex-start; }
.reveal .question { background: var(--panel); border-left: 6px solid var(--accent); border-radius: 6px; padding: 0.45em 0.8em; margin: 0 0 0.7em; }
.reveal .question b:first-child { color: var(--accent); }
.reveal .answer { background: #eef6ef; border-left: 6px solid #2e7d32; border-radius: 6px; padding: 0.45em 0.8em; margin: 0.6em 0 0; }
.reveal .footnote { font-size: 0.78em; color: var(--muted); margin-top: 0.6em; }
.reveal .problem ol { list-style: none; margin: 0; padding: 0; }
.reveal .problem li { font-size: 0.8em; }
.reveal .problem li + li { margin-top: 0.55em; }
.reveal .problem.long p, .reveal .problem.long li { font-size: 0.66em; }
.reveal table.measure { border-collapse: collapse; margin: 0.2em 0 0.6em; }
.reveal table.measure th, .reveal table.measure td { padding: 0.18em 0.6em; border-bottom: 1px solid var(--rule); text-align: right; }
.reveal table.measure th:first-child, .reveal table.measure td:first-child { text-align: left; white-space: nowrap; }
.reveal table.measure th { font-size: 0.85em; color: var(--muted); font-weight: 600; }
.reveal input[data-key] { font: inherit; width: 4.6em; padding: 1px 6px; border: 1px solid #9aa7b5; border-radius: 4px; text-align: right; background: #fffdf3; }
.reveal input[data-key].list { width: 13em; text-align: left; }
.reveal input[data-key].list.short { width: 10.5em; }
.reveal .btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 0.3em 0 0.5em; }
.reveal .btn-row button { font: inherit; font-size: 0.85em; padding: 0.2em 0.75em; border-radius: 6px; border: 1px solid var(--accent); background: var(--accent); color: #fff; cursor: pointer; }
.reveal .btn-row button.secondary { background: #fff; color: var(--accent); }
.reveal .btn-row button:focus-visible { outline: 3px solid #f2b705; outline-offset: 2px; }
.reveal .result { min-height: 1.3em; line-height: 1.4; }
.reveal .result.error { color: var(--caution); font-weight: 600; }
.reveal .result table.measure { font-size: 0.92em; }
.reveal .result table.measure td + td { white-space: nowrap; }
.reveal ul.answer { margin-left: 0; padding-left: 1.7em; }
.reveal ul.answer li + li { margin-top: 0.3em; }
/* Invisible step: lets → (or a clicker) trigger a Solve. */
.reveal .fragment.step { display: block; height: 0; overflow: hidden; }

.reveal .ex-cols.even { grid-template-columns: 1fr 1fr; }

/* exercises.html: the list of worked solutions. */
.reveal .exercise-list li { font-size: 0.9em; }
.reveal .exercise-list a { text-decoration: none; }
.reveal .exercise-list + p { margin-top: 1.6em; }
/* A table laid out across (Exercise 3): tighter columns. */
.reveal table.measure.wide { font-size: 0.82em; }
/* A table of inputs in several columns (Exercise 2c): narrower boxes. */
.reveal table.measure.compact input[data-key] { width: 2.9em; }
.reveal table.measure.compact th, .reveal table.measure.compact td { padding: 0.18em 0.3em; }
.reveal table.measure.wide th, .reveal table.measure.wide td { padding: 0.18em 0.35em; }