/**
 * Advanced Dodecahedron course
 */

.dd-course {
  --dd-accent: var(--education-accent, #c9a227);
  --dd-space: 1.25rem;
  max-width: var(--max-width);
  margin: 0 auto;
  color: var(--color-text);
  font-family: var(--font-sans);
  padding-bottom: 3rem;
}

.dd-hero {
  position: relative;
  border-radius: 1rem;
  overflow: hidden;
  min-height: min(42vh, 380px);
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-panel-outline);
}

.dd-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.dd-hero__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    color-mix(in srgb, var(--color-bg) 88%, transparent) 0%,
    color-mix(in srgb, var(--color-bg) 35%, transparent) 55%,
    transparent 100%
  );
}

.dd-hero__copy {
  position: relative;
  z-index: 1;
  padding: clamp(1.25rem, 4vw, 2.25rem);
  max-width: 34rem;
}

.dd-hero__layers {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dd-accent);
  font-weight: 600;
}

.dd-hero__copy h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.dd-hero__copy p:last-child {
  margin: 0;
  color: var(--color-muted);
  line-height: 1.5;
}

.dd-intro {
  margin: 0 0 0.5rem;
  max-width: 62ch;
  color: var(--color-muted);
  line-height: 1.6;
}

.dd-source {
  margin: 0 0 1.75rem;
  font-size: 0.82rem;
  color: color-mix(in srgb, var(--color-muted) 80%, transparent);
}

.dd-layout {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 960px) {
  .dd-layout {
    grid-template-columns: minmax(0, 16.5rem) minmax(0, 1fr);
    align-items: start;
  }
}

.dd-nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding-right: 0.25rem;
}

.dd-nav__part {
  margin: 0.85rem 0 0.25rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dd-accent);
  font-weight: 600;
}

.dd-nav__part:first-child {
  margin-top: 0;
}

.dd-nav__item {
  appearance: none;
  text-align: left;
  border: 1px solid var(--color-panel-outline);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: 0.65rem;
  padding: 0.65rem 0.75rem;
  cursor: pointer;
  font: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  transition: border-color 160ms ease, background 160ms ease;
}

.dd-nav__item:hover,
.dd-nav__item:focus-visible {
  border-color: color-mix(in srgb, var(--dd-accent) 50%, var(--color-panel-outline));
  outline: none;
}

.dd-nav__item[aria-current="true"] {
  border-color: color-mix(in srgb, var(--dd-accent) 70%, transparent);
  background: color-mix(in srgb, var(--dd-accent) 12%, var(--color-surface));
}

.dd-nav__item.is-done .dd-nav__title::after {
  content: " ✓";
  color: var(--dd-accent);
  font-size: 0.85em;
}

.dd-nav__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: -0.01em;
}

.dd-nav__sum {
  font-size: 0.75rem;
  color: var(--color-muted);
  line-height: 1.35;
}

.dd-lesson__part {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--dd-accent);
  font-weight: 600;
}

.dd-lesson__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 1.85rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.dd-lesson__summary {
  margin: 0 0 1.25rem;
  color: var(--color-muted);
  max-width: 58ch;
}

.dd-section-heading {
  margin: 1.5rem 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

.dd-section-body {
  max-width: 68ch;
}

.dd-section-body p,
.dd-section-body li {
  line-height: 1.65;
  font-size: 0.98rem;
}

.dd-section-body ul {
  padding-left: 1.2rem;
}

.dd-quote {
  margin: 1.25rem 0;
  padding: 0.9rem 1.1rem;
  border-left: 3px solid var(--dd-accent);
  background: color-mix(in srgb, var(--dd-accent) 8%, var(--color-surface));
  border-radius: 0 0.6rem 0.6rem 0;
}

.dd-quote p {
  margin: 0;
  font-style: italic;
}

.dd-equation {
  margin: 1rem 0;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  border: 1px solid var(--color-panel-outline);
  border-radius: 0.65rem;
  background: var(--color-bg-accent);
  text-align: center;
}

.dd-figure {
  margin: 1.35rem 0;
}

.dd-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 0.85rem;
  border: 1px solid var(--color-panel-outline);
  background: var(--color-surface);
}

.dd-figure figcaption {
  margin-top: 0.55rem;
  font-size: 0.85rem;
  color: var(--color-muted);
  line-height: 1.45;
  max-width: 62ch;
}

.dd-table-wrap {
  overflow-x: auto;
  margin: 1rem 0 1.35rem;
}

.dd-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 18rem;
}

.dd-table th,
.dd-table td {
  padding: 0.5rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid var(--color-panel-outline);
}

.dd-table th {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  font-weight: 500;
}

.dd-table td:last-child {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.dd-lab-mount {
  margin: 0 0 1.5rem;
}

.dd-lab {
  border: 1px solid var(--color-panel-outline);
  border-radius: 1rem;
  overflow: hidden;
  background:
    radial-gradient(circle at 40% 20%, color-mix(in srgb, var(--dd-accent) 12%, transparent), transparent 55%),
    var(--color-bg-accent);
}

.dd-lab__canvas {
  aspect-ratio: 16 / 10;
  min-height: 260px;
}

.dd-lab__canvas canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
}

.dd-lab__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.75rem 0.85rem;
  border-top: 1px solid var(--color-panel-outline);
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
}

.dd-lesson-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.dd-related {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
  font-size: 0.92rem;
}

.dd-related a {
  color: var(--color-link);
}

.home-spotlight__card--dodeca {
  border-color: color-mix(in srgb, #c9a227 45%, var(--color-panel-outline));
}