.content-feed-section {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}
.content-feed-section .section-head {
  margin-bottom: 28px;
}
.content-feed-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.content-feed-card {
  display: flex;
  flex-direction: column;
  min-height: 220px;
  padding: 24px;
  background: var(--white);
  border: 1.5px solid var(--line);
  border-radius: 18px;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.content-feed-card:hover {
  transform: translateY(-3px);
  border-color: var(--red);
  box-shadow: 0 14px 30px rgba(23, 20, 15, .08);
}
.content-feed-card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--red-deep);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.content-feed-card h3 {
  margin-top: 18px;
  font-size: 21px;
}
.content-feed-card p {
  margin: 10px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
}
.content-feed-card__arrow {
  margin-top: auto;
  padding-top: 20px;
  color: var(--red-deep);
  font-size: 14px;
  font-weight: 700;
}
.content-feed-card--premium {
  background: linear-gradient(145deg, #fff 0%, #fff6f1 100%);
}
.content-feed-status {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}
.content-feed-section[data-content-feed-state="error"] .content-feed-status {
  color: var(--amber);
}
.content-post-shell {
  max-width: 860px;
  margin: 0 auto;
  padding: 86px 32px 100px;
}
.content-post-back {
  display: inline-flex;
  margin-bottom: 32px;
  color: var(--red-deep);
  font-size: 14px;
  font-weight: 700;
}
.content-post-kicker {
  color: var(--red-deep);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.content-post-shell h1 {
  margin-top: 14px;
  font-size: clamp(34px, 6vw, 64px);
}
.content-post-excerpt {
  max-width: 680px;
  margin: 20px 0 0;
  color: var(--ink-soft);
  font-size: 19px;
  line-height: 1.65;
}
.content-post-body {
  margin-top: 48px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
  font-size: 17px;
  line-height: 1.85;
}
.content-post-body img {
  max-height: 420px;
  margin: 0 auto 32px;
  border-radius: 18px;
  object-fit: cover;
}
.content-post-download {
  display: inline-flex;
  margin-top: 24px;
  padding: 13px 18px;
  border-radius: 999px;
  background: #9A0D13;
  color: #FFF;
  font-weight: 700;
  text-decoration: none;
}
.content-post-body p {
  margin: 0;
}
@media (max-width: 860px) {
  .content-feed-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .content-feed-section { padding: 52px 0; }
  .content-feed-grid { grid-template-columns: 1fr; }
  .content-post-shell { padding: 56px 20px 72px; }
  .content-post-excerpt { font-size: 17px; }
  .content-post-body { font-size: 16px; }
}

.lesson-quiz {
  margin-top: 42px;
  padding: 28px;
  border: 1.5px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(145deg, #fff 0%, #fff6f1 100%);
}
.lesson-quiz h2 { margin: 10px 0 20px; font-size: 24px; }
.lesson-quiz-choices { display: grid; gap: 10px; }
.lesson-quiz-choice { padding: 14px 16px; border: 1.5px solid var(--line); border-radius: 12px; background: #fff; color: var(--ink); text-align: left; font: inherit; cursor: pointer; }
.lesson-quiz-choice:hover, .lesson-quiz-choice.is-selected { border-color: var(--red); }
.lesson-quiz-choice.is-correct { border-color: var(--green); background: #edf8ef; }
.lesson-quiz-result { min-height: 22px; margin: 16px 0 0; font-size: 14px; font-weight: 700; }
.lesson-quiz-result.is-correct { color: var(--green); }
.lesson-quiz-result.is-wrong { color: var(--red-deep); }