/* Courses tab — article view: hero, source links, intro, chapter rows.
   There is no back button: the tab has only this one course. */

.courses-detail-view {
  max-width: 880px;
  margin: 0 auto;
}

.course-article {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.course-sources {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.course-source-link {
  padding: 5px 11px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: border-color 0.15s ease;
}

.course-source-link:hover {
  border-color: var(--accent-text);
}

.course-hero {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.course-hero-logo {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
  object-fit: contain;
  background: var(--img-mat);
  border-radius: 10px;
  padding: 6px;
  box-sizing: border-box;
}

.course-hero-text {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.course-hero-title {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
}

.course-hero-subtitle {
  margin: 0;
  font-size: 15px;
  color: var(--muted);
  line-height: 1.5;
}

.course-intro {
  margin: 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
}

.course-chapters {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.course-chapter {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: center;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
}

.course-chapter-right {
  grid-template-columns: 1fr 280px;
}

.course-chapter-right .course-chapter-img {
  order: 2;
}

.course-chapter-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 10px;
  background: var(--img-mat);
}

.course-chapter-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.course-chapter-title {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  color: var(--text);
}

.course-chapter-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

.course-chapter-clickable {
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.05s ease;
}

.course-chapter-clickable:hover {
  border-color: var(--chapter-color, var(--accent));
}

.course-chapter-clickable:focus-visible {
  outline: none;
  border-color: var(--chapter-color, var(--accent));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--chapter-color, var(--accent-dark)) 45%, transparent);
}

.course-chapter-clickable:active {
  transform: scale(0.998);
}