/* Shared Accent theme. Page-specific layouts and mathematical graphics stay local. */
:root {
  --indigo: #0c355c; --ocean: #126581; --forest: #086015;
  --leaf: #59870b; --turquoise: #00a3bd; --lime: #9cba0b;
  --bg: #f3f7f8; --surface: #fff; --card: #fff;
  --text: #0c355c; --txt: #0c355c; --ink: #0c355c; --muted: #496574;
  --border: #bdcfd5; --b: #bdcfd5; --line: #bdcfd5;
  --blue: #126581; --blue2: #0c355c; --blue-dark: #0c355c; --blue-bright: #126581;
  --primary: #126581; --primary-dark: #0c355c; --accent: #126581;
  --sky: #00a3bd; --green: #59870b; --mint: #086015; --deep-teal: #126581;
  --soft-blue: #edf8fa; --soft-green: #f2f6e8;
  --shadow: 4px 4px 0 #ccdde3;
}
body.site-page { background: var(--bg); color: var(--text); }
.site-page :where(.card, .panel, .chapter-block, .graph-card, .plot-card, .intro-dialog) {
  border: 2px solid var(--indigo); border-radius: 12px; box-shadow: var(--shadow);
}
.site-page :where(.stat, .memo, fieldset, .level-picker) { border-radius: 10px; }
.site-page :where(h1, h2, h3) { color: inherit; }
.site-page :where(h1) { font-weight: 800; letter-spacing: -.035em; }
.site-page :where(.statement, .question-zone, .function-box) {
  background: #edf8fa; border-color: #abd5df; box-shadow: none; border-radius: 12px;
}
.site-page .exercise-nav a { border-radius: 8px; background: var(--ocean); color: white; }
.site-page :where(button.primary, button.btn-primary, .button.primary, .btn.primary) {
  background: var(--ocean); border-color: var(--ocean); color: white; border-radius: 8px;
}
.site-page :where(button.secondary, .btn.secondary) { background: #d9edf1; color: var(--indigo); border-radius: 8px; }
.site-page :where(a, button, input, select, textarea):focus-visible { outline: 3px solid var(--ocean); outline-offset: 3px; }
.site-page .choice.answer-correct { border-color: var(--forest); background: #e7efce; }
.site-page .choice.answer-wrong { border-color: #b33838; background: #fff0f0; }

/* Catalogs: the approved layout, including the activity/exercise distinction. */
.site-catalog { line-height: 1.5; }
.site-catalog .site-header { max-width: 1160px; padding: 0 24px 14px; }
.site-catalog .masthead { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px 0; }
.site-catalog .brand { flex-shrink: 0; font-size: 18px; font-weight: 750; line-height: 1.35; }
.site-catalog .brand span { display: block; margin-top: 4px; color: var(--muted); font-size: 11px; font-weight: 500; letter-spacing: .03em; }
.site-catalog .topnav { margin: 0; justify-content: flex-end; gap: 6px; }
.site-catalog .topnav a { padding: 9px 11px; background: transparent; border: 0; border-radius: 8px; font-size: 13px; font-weight: 650; }
.site-catalog .topnav a.active { background: var(--ocean); color: #fff; }
.site-catalog .topnav a:hover { background: #d9edf1; color: var(--indigo); }
.site-catalog .hero { background: #e0f0f4; color: var(--indigo); border: 2px solid var(--indigo); box-shadow: 6px 6px 0 var(--indigo); border-radius: 12px; padding: 38px 30px; }
.site-catalog .hero h1 { font-size: clamp(1.8rem, 3.6vw, 2.75rem); font-weight: 850; line-height: 1.15; letter-spacing: -.045em; margin: 0; }
.site-catalog .hero .subtitle { color: var(--muted); margin: 14px auto 0; font-size: .95rem; }
.site-catalog main { max-width: 1160px; padding: 26px 24px 38px; }
.site-catalog .chapters { gap: 20px; }
.site-catalog .chapter-block { padding: 24px; background: white; scroll-margin-top: 20px; }
.site-catalog .chapter-heading { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.site-catalog .chapter-number { width: 44px; height: 44px; flex-shrink: 0; display: grid; place-items: center; background: #d9edf1; color: var(--indigo); border: 1px solid var(--indigo); border-radius: 50%; font-size: 17px; font-weight: 750; }
.site-catalog .chapter-heading h2 { font-size: 17px; line-height: 1.35; margin: 0; }
.site-catalog .chapter-kicker { display: block; color: var(--muted); font-size: 10px; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 3px; }
.site-catalog .exercise-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.site-catalog .card { min-width: 0; border: 1px solid #becf9a; border-radius: 4px; background: #f2f6e8; box-shadow: none; padding: 18px; gap: 15px; }
.site-catalog .card h3 { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; font-size: 14px; line-height: 1.4; margin: 0; }
.site-catalog .card p { font-size: 12px; line-height: 1.65; margin-top: 10px; color: var(--muted); }
.site-catalog .card.activity { background: #eee8f8; border-color: #c4b5df; }
.site-catalog .card:hover { transform: none; box-shadow: 3px 3px 0 var(--leaf); border-color: var(--leaf); }
.site-catalog .card.activity:hover { box-shadow: 3px 3px 0 #c4b5df; border-color: #80649f; }
.site-catalog .app-tag { order: -1; display: inline-flex; align-items: center; gap: 5px; padding: 4px 7px; border: 1px solid var(--leaf); border-radius: 20px; background: #e7efce; color: var(--forest); font-size: 10px; line-height: 1.4; font-weight: 650; }
.site-catalog .app-tag::before { content: '✎'; }
.site-catalog .activity .app-tag { color: #514180; background: #e3d9f3; border-color: #b6a3d2; }
.site-catalog .activity .app-tag::before { content: '◈'; }
.site-catalog .link-label { display: flex; align-items: center; justify-content: space-between; color: var(--forest); font-size: 11px; font-weight: 750; }
.site-catalog .link-label::after { content: '↗'; font-size: 17px; }
.site-catalog .activity .link-label { color: #514180; }
.site-catalog .chapter-see-also { font-size: 11px; }
.site-catalog .chapter-jumps { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; font-size: 11px; margin-bottom: 26px; }
.site-catalog .chapter-jumps > span { color: var(--muted); margin-right: 7px; }
.site-catalog .chapter-jumps a { display: grid; place-items: center; width: 32px; height: 30px; border: 1px solid var(--line); border-radius: 6px; background: white; }
.site-catalog .chapter-jumps a:hover { background: var(--lime); color: var(--indigo); }
.site-catalog .card.programming-access { background: #0b1118; border: 2px solid var(--indigo); border-radius: 12px; box-shadow: var(--shadow); color: #e5f0f4; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.site-catalog .programming-access h2::before { color: #9cce7f; }
.site-catalog .card.programming-access p { color: #b8cad2; }
.site-catalog .card.programming-access:hover { background: #101d27; border-color: var(--ocean); }
.site-catalog .programming-access .symbol, .site-catalog .symbol { background: #d9f2f5; color: var(--ocean); border: 1px solid var(--ocean); border-radius: 50%; }
.site-catalog .programming-access .link-label { color: #9cce7f; }

/* Flashcards always precede exercises and activities in chapter grids. */
.site-catalog .exercise-grid > .course { order: -1; background: #edf8fa; border-color: #abd5df; }
.site-catalog .course .app-tag { background: #d9f2f5; color: var(--ocean); border-color: var(--ocean); }
.site-catalog .course .app-tag::before { content: '▤'; }
.site-catalog .card.course:hover { border-color: var(--ocean); box-shadow: 3px 3px 0 var(--turquoise); }
.site-catalog .course .link-label { color: var(--ocean); }

/* Exercise and activity headers do not change the controls or plot layouts. */
:is(.site-exercise, .site-activity) > header,
:is(.site-exercise, .site-activity) > main > header,
.site-activity .app > .header {
  background: #e0f0f4; color: var(--indigo); border: 2px solid var(--indigo);
  border-radius: 12px; margin-bottom: 24px;
}
.site-editor > header { background: #e0f0f4; color: var(--indigo); border-bottom: 2px solid var(--indigo); }
.site-editor .back { color: var(--ocean); }
.site-rallye h1 { color: var(--indigo); }
.site-rallye .card { background: white; }
.site-rallye button, .site-rallye .button { background: var(--ocean); border-radius: 8px; }
.site-rallye button:hover, .site-rallye .button:hover { background: var(--indigo); }
.site-rallye .eyebrow, .site-rallye .step, .site-rallye figcaption { color: var(--muted); }
@media (max-width: 1050px) {
  .site-catalog .masthead { flex-direction: column; align-items: flex-start; gap: 18px; }
  .site-catalog .topnav { justify-content: flex-start; }
}
@media (max-width: 950px) {
  .site-catalog .exercise-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 650px) {
  .site-catalog .exercise-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .site-catalog .site-header { padding: 0 16px 14px; }
  .site-catalog main { padding: 22px 16px 32px; }
  .site-catalog .masthead { padding: 22px 0; }
  .site-catalog .topnav { display: flex; flex-wrap: wrap; gap: 4px; }
  .site-catalog .topnav a { padding: 8px; font-size: 12px; }
  .site-catalog .hero { padding: 26px 20px; }
  .site-catalog .chapter-block { padding: 18px; }
  .site-catalog .chapter-heading { gap: 10px; }
  .site-catalog .chapter-heading h2 { font-size: 16px; }
  .site-catalog .chapter-jumps > span { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  .site-page .card { transition: none; }
}

/* Séparer la navigation du titre des exercices. */
.site-page .exercise-nav { margin-bottom: 24px; }