/*
 * Trigonometry course — shared typography and reusable widget styling.
 * Linked by every lesson and reference page in this course via frontmatter `styles`.
 * The Astro app supplies the page shell and layout primitives (see ../../lesson-pages);
 * this file owns the reading experience and the course's own components.
 */

:root {
  --trig-measure: 35rem;
  --trig-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --trig-sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --trig-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --trig-cos: #1f6f4a;
  --trig-sin: #a8480f;
  --trig-radius: #2458a6;
  --trig-wrong: #a11c2b;
}

body {
  font-family: var(--trig-serif);
  font-size: clamp(1.02rem, 0.98rem + 0.25vw, 1.18rem);
  line-height: 1.62;
  text-rendering: optimizeLegibility;
}

/* Tufte-ish column: prose sits in a narrow measure, figures and widgets run wide. */
.lesson-content > p,
.lesson-content > ul,
.lesson-content > ol,
.lesson-content > dl,
.lesson-content > h2,
.lesson-content > h3,
.lesson-content > h4,
.lesson-content > blockquote,
.lesson-content > table,
.lesson-content > .measured {
  max-width: var(--trig-measure);
}

.lesson-header .eyebrow {
  margin: 0 0 .5rem;
  color: var(--learning-muted);
  font-family: var(--trig-sans);
  font-size: .72rem;
  font-weight: 650;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.lesson-header h1 {
  max-width: 24ch;
  margin: 0;
  font-size: clamp(2rem, 1.5rem + 2.2vw, 3rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.015em;
}

.lesson-header .lede {
  max-width: var(--trig-measure);
  margin: .75rem 0 0;
  color: var(--learning-muted);
  font-size: 1.15rem;
  font-style: italic;
}

.lesson-content h2 {
  margin: 3rem 0 .75rem;
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -.01em;
}

.lesson-content h3 {
  margin: 2rem 0 .5rem;
  font-size: 1.18rem;
  font-weight: 650;
}

.lesson-content a {
  color: inherit;
  text-decoration-color: color-mix(in srgb, var(--learning-accent) 55%, transparent);
  text-decoration-thickness: 1px;
  text-underline-offset: .16em;
}

.lesson-content a:hover,
.lesson-content a:focus-visible { text-decoration-color: var(--learning-accent); }

code, kbd, samp { font-family: var(--trig-mono); font-size: .88em; }

:not(pre) > code {
  padding: .1em .32em;
  border-radius: .25em;
  background: color-mix(in srgb, currentColor 7%, transparent);
}

pre {
  max-width: 46rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--learning-rule);
  border-left: 3px solid color-mix(in srgb, var(--learning-accent) 60%, transparent);
  border-radius: .4rem;
  background: color-mix(in srgb, var(--learning-ink) 4%, transparent);
  font-size: .82rem;
  line-height: 1.55;
}

blockquote {
  margin-inline: 0;
  padding-left: 1.1rem;
  border-left: 2px solid var(--learning-rule);
  color: var(--learning-muted);
  font-style: italic;
}

/* --- Components ---------------------------------------------------------- */

/* Aside: a margin note that stays inline on narrow screens. */
.note {
  max-width: var(--trig-measure);
  margin: 1.5rem 0;
  padding: .85rem 1.1rem;
  border-left: 3px solid color-mix(in srgb, var(--learning-accent) 45%, transparent);
  background: color-mix(in srgb, var(--learning-accent) 5%, transparent);
  font-size: .94rem;
}

.note > :first-child { margin-top: 0; }
.note > :last-child { margin-bottom: 0; }
.note--trap { border-left-color: color-mix(in srgb, var(--trig-wrong) 55%, transparent); }
.note--trap { background: color-mix(in srgb, var(--trig-wrong) 5%, transparent); }

.note__label {
  display: block;
  margin-bottom: .3rem;
  font-family: var(--trig-sans);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
}

/* Figure: full-width block for widgets and diagrams. */
.figure { margin: 2.25rem 0; }

.figure > figcaption {
  max-width: var(--trig-measure);
  margin-top: .7rem;
  color: var(--learning-muted);
  font-size: .88rem;
  line-height: 1.5;
}

/* Recall card: native <details>, no JavaScript needed. */
.recall {
  max-width: var(--trig-measure);
  margin: 1.25rem 0;
  padding: .3rem .95rem;
  border: 1px solid var(--learning-rule);
  border-radius: .5rem;
  background: color-mix(in srgb, var(--learning-ink) 2.5%, transparent);
}

.recall > summary {
  padding: .55rem 0;
  font-family: var(--trig-sans);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
}

.recall > summary:focus-visible { outline: 2px solid var(--learning-accent); outline-offset: 3px; }
.recall[open] > summary { margin-bottom: .2rem; border-bottom: 1px solid var(--learning-rule); }
.recall > :last-child { margin-bottom: .8rem; }

/* Angle dial widget — see angle-dial.js */
.angle-dial {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  padding: 1.25rem;
  border: 1px solid var(--learning-rule);
  border-radius: .6rem;
  background: color-mix(in srgb, #fff 55%, transparent);
}

@media (min-width: 46rem) {
  .angle-dial { grid-template-columns: minmax(0, 20rem) minmax(0, 1fr); }
}

.angle-dial__canvas {
  display: block;
  width: 100%;
  max-width: 22rem;
  margin-inline: auto;
  border-radius: .4rem;
  touch-action: none;
  cursor: grab;
}

.angle-dial__canvas:active { cursor: grabbing; }
.angle-dial__canvas:focus-visible { outline: 2px solid var(--learning-accent); outline-offset: 3px; }

.angle-dial__panel { font-family: var(--trig-sans); }

.angle-dial__readout {
  display: grid;
  gap: .35rem .9rem;
  grid-template-columns: auto 1fr;
  margin: 0 0 1rem;
  font-size: .95rem;
}

.angle-dial__readout dt { color: var(--learning-muted); font-size: .8rem; letter-spacing: .04em; }
.angle-dial__readout dd { margin: 0; font-family: var(--trig-mono); font-variant-numeric: tabular-nums; }
.angle-dial__readout .is-cos { color: var(--trig-cos); }
.angle-dial__readout .is-sin { color: var(--trig-sin); }
.angle-dial__readout .is-angle { color: var(--trig-radius); }

.angle-dial__slider { width: 100%; margin: 0 0 .9rem; accent-color: var(--learning-accent); }

.angle-dial__label {
  display: block;
  margin-bottom: .3rem;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--learning-muted);
}

.angle-dial__snaps { display: flex; flex-wrap: wrap; gap: .3rem; margin-bottom: .9rem; }

.angle-dial__snaps button {
  padding: .3rem .55rem;
  border: 1px solid var(--learning-rule);
  border-radius: .3rem;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: .82rem;
  cursor: pointer;
}

.angle-dial__snaps button:hover { background: color-mix(in srgb, var(--learning-accent) 12%, transparent); }
.angle-dial__snaps button:focus-visible { outline: 2px solid var(--learning-accent); outline-offset: 2px; }

.angle-dial__toggle {
  display: flex;
  align-items: center;
  gap: .45rem;
  font-size: .88rem;
  cursor: pointer;
}

.angle-dial__status {
  margin: .8rem 0 0;
  min-height: 1.2em;
  color: var(--learning-muted);
  font-size: .82rem;
}

/* Quiz widget — see quiz.js. Works without JavaScript; JS adds instant feedback. */
.quiz {
  max-width: 42rem;
  margin: 2rem 0;
  padding: 1.25rem 1.4rem;
  border: 1px solid var(--learning-rule);
  border-radius: .6rem;
  background: color-mix(in srgb, var(--learning-ink) 2.5%, transparent);
  font-family: var(--trig-sans);
}

.quiz > h2, .quiz > h3 { margin-top: 0; }

.quiz__q { margin: 0 0 1.5rem; padding: 0; border: 0; }
.quiz__q:last-of-type { margin-bottom: .5rem; }

.quiz__q > legend {
  padding: 0;
  margin-bottom: .6rem;
  font-family: var(--trig-serif);
  font-size: 1.02rem;
  font-weight: 600;
}

.quiz__option {
  display: flex;
  gap: .6rem;
  align-items: baseline;
  padding: .45rem .6rem;
  border: 1px solid transparent;
  border-radius: .35rem;
  font-size: .95rem;
  cursor: pointer;
}

.quiz__option:hover { background: color-mix(in srgb, currentColor 6%, transparent); }
.quiz__option input { accent-color: var(--learning-accent); }
.quiz__option:focus-within { outline: 2px solid var(--learning-accent); outline-offset: 1px; }

.quiz__option[data-state="right"] {
  border-color: color-mix(in srgb, var(--trig-cos) 45%, transparent);
  background: color-mix(in srgb, var(--trig-cos) 10%, transparent);
}

.quiz__option[data-state="wrong"] {
  border-color: color-mix(in srgb, var(--trig-wrong) 45%, transparent);
  background: color-mix(in srgb, var(--trig-wrong) 8%, transparent);
}

.quiz__mark { margin-left: auto; font-weight: 700; }
.quiz__option[data-state="right"] .quiz__mark { color: var(--trig-cos); }
.quiz__option[data-state="wrong"] .quiz__mark { color: var(--trig-wrong); }

.quiz__explain {
  margin: .6rem 0 0;
  padding-left: .6rem;
  border-left: 2px solid var(--learning-rule);
  color: var(--learning-muted);
  font-size: .9rem;
  line-height: 1.5;
}

.quiz__score { margin: 0; font-size: .9rem; font-weight: 600; min-height: 1.2em; }

/* Reference tables */
.lesson-content table { border-collapse: collapse; font-size: .92rem; }
.lesson-content th, .lesson-content td { padding: .4rem .8rem .4rem 0; text-align: left; }
.lesson-content thead th { border-bottom: 1px solid var(--learning-ink); font-family: var(--trig-sans); font-size: .78rem; letter-spacing: .05em; text-transform: uppercase; }
.lesson-content tbody tr + tr td { border-top: 1px solid var(--learning-rule); }
.lesson-content td { font-variant-numeric: tabular-nums; }

/* Print: reference pages should survive a trip to paper. */
@media print {
  :root { --trig-measure: none; }
  body { background: #fff; font-size: 10.5pt; }
  .learning-home, .course-navigator, .learning-footer, .lesson-podcast,
  .angle-dial__slider, .angle-dial__snaps, .angle-dial__toggle, .angle-dial__status { display: none !important; }
  .lesson-content { width: auto; }
  .recall[open], .recall { break-inside: avoid; }
  .quiz, .note, .figure { break-inside: avoid; }
  .recall > summary { list-style: none; }
  .lesson-content a { text-decoration: none; }
  .lesson-content a[href^="http"]::after { content: " (" attr(href) ")"; font-size: 8pt; word-break: break-all; }
}