:root {
  color-scheme: light dark;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  --background: #f4f7f6;
  --surface: #ffffff;
  --text: #17211e;
  --muted: #4d5e58;
  --accent: #005a46;
  --accent-contrast: #ffffff;
  --border: #b6c5c0;
  --focus: #a33c00;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--text);
  background: var(--background);
}

.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  top: -5rem;
  z-index: 2;
  padding: 0.75rem 1rem;
  color: var(--accent-contrast);
  background: var(--accent);
}

.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.site-header {
  color: var(--accent-contrast);
  background: var(--accent);
}

.header-content,
.page-shell {
  width: calc(100% - 2rem);
  max-width: 76rem;
  margin-inline: auto;
}

.header-content { padding: clamp(2rem, 6vw, 5rem) 0; }
.page-shell { padding-block: clamp(1.5rem, 5vw, 4rem); }

h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(2.2rem, 8vw, 4.8rem); line-height: 1.05; }
h2 { margin: 0; font-size: clamp(1.5rem, 4vw, 2.25rem); }
h3 { margin-block: 0 1rem; font-size: 1.25rem; }

.eyebrow {
  margin-block: 0 0.35rem;
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lead { max-width: 48rem; margin-block: 1rem 0; font-size: 1.15rem; }

.catalog-panel,
.course-card {
  border: 1px solid var(--border);
  border-radius: 0.8rem;
  background: var(--surface);
}

.catalog-panel { padding: clamp(1rem, 4vw, 2rem); }

.section-heading {
  display: flex;
  gap: 1rem;
  align-items: start;
  justify-content: space-between;
}

.status { min-height: 1.6em; color: var(--muted); }

.course-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.course-card { padding: 1.25rem; }

.course-card.is-selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent);
}

.course-action {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.course-action-status { min-height: 1.6em; margin: 0; color: var(--muted); }

.primary-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1rem;
  border: 2px solid var(--accent);
  border-radius: 0.35rem;
  color: var(--accent-contrast);
  background: var(--accent);
  font-weight: 700;
  text-align: center;
}

.review-toggle,
.review-more {
  margin-top: 1rem;
  color: var(--accent-contrast);
  background: var(--accent);
}

.review-view {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.review-view h4 { margin-block: 0 .4rem; }
.review-summary, .review-status, .review-date { color: var(--muted); }
.review-list { display: grid; gap: .75rem; padding: 0; list-style: none; }
.review-item { padding: .85rem; border: 1px solid var(--border); border-radius: .55rem; }
.review-item h4, .review-text, .review-date { margin-block: 0 .4rem; }
.review-text { white-space: pre-wrap; }

dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.35rem 1rem;
  margin: 0;
}

dt { color: var(--muted); font-weight: 650; }
dd { margin: 0; }

button {
  min-height: 44px;
  min-width: 44px;
  padding: 0.65rem 1rem;
  border: 2px solid var(--accent);
  border-radius: 0.35rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button.secondary { color: var(--accent); background: transparent; }
button:hover { text-decoration: underline; text-underline-offset: 0.2em; }

@media (max-width: 36rem) {
  .section-heading { display: block; }
  .section-heading button { width: 100%; margin-top: 1rem; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #101815;
    --surface: #18231f;
    --text: #edf5f2;
    --muted: #b9c8c3;
    --accent: #73d9bb;
    --accent-contrast: #08120f;
    --border: #50615b;
    --focus: #ffad75;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}

@media (forced-colors: active) {
  .catalog-panel, .course-card, .review-item, button, .primary-link { border: 1px solid CanvasText; }
  :focus-visible { outline-color: Highlight; }
}