/* Learn page: YouTube video cards */
.learn-head {
  margin-bottom: 24px;
}

.learn-head h1 {
  margin: 0 0 8px;
  font-size: clamp(1.9rem, 3.4vw, 2.9rem);
}

.learn-head p {
  margin: 0;
  max-width: 620px;
  color: var(--cb-text-muted);
}

.learn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
}

.learn-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--cb-card-strong);
  border: 1px solid var(--cb-border);
  border-radius: var(--cb-radius-sm);
  color: var(--cb-text);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.learn-card:hover {
  border-color: var(--cb-border-strong);
  transform: translateY(-3px);
}

.learn-thumb {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  background: var(--cb-bg-soft);
  overflow: hidden;
}

.learn-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.learn-play {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.65);
  color: #ffffff;
  transition: background 0.2s ease, transform 0.2s ease;
}

.learn-card:hover .learn-play {
  background: #ff0000;
  transform: translate(-50%, -50%) scale(1.08);
}

.learn-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 18px;
}

.learn-title {
  font-family: var(--cb-font-display);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
}

.learn-note {
  font-size: 0.88rem;
  color: var(--cb-text-muted);
}

.learn-watch {
  margin-top: 4px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--cb-accent);
}

body.light-mode .learn-watch { color: #8a6500; }

.learn-card:focus-visible {
  outline: 2px solid var(--cb-accent);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .learn-card, .learn-play { transition: none; }
}