/* =============================================
   /learn 사용법 영상 페이지 — Phase 0a C7
   ============================================= */

.learn-page {
  background: #fafaf9;
  min-height: calc(100vh - 58px);
  padding: 3rem 0 5rem;
}

.learn-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.learn-header { margin-bottom: 2.5rem; }
.learn-title {
  font-size: 2rem;
  font-weight: 800;
  color: #09090b;
  letter-spacing: -0.03em;
  margin: 0 0 .5rem;
}
.learn-sub {
  color: #6b7280;
  font-size: 1rem;
  margin: 0 0 1.5rem;
}

.learn-filters {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.learn-filter {
  padding: .375rem .875rem;
  background: #fff;
  border: 1px solid #e4e4e7;
  border-radius: 999px;
  font-size: .8125rem;
  font-weight: 600;
  color: #4b5563;
  cursor: pointer;
  transition: all .15s;
}
.learn-filter:hover { border-color: #09090b; color: #09090b; }
.learn-filter.active { background: #09090b; border-color: #09090b; color: #fff; }

/* Grid */
.learn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.learn-loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem;
  color: #9ca3af;
  font-size: .9rem;
}

.learn-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid #e4e4e7;
  border-radius: 12px;
  overflow: hidden;
  transition: all .18s;
  text-decoration: none;
  color: inherit;
}
.learn-card:hover {
  background: #fff;  /* main.css의 button:hover (0,1,1) override — specificity (0,2,0) */
  border-color: #09090b;
  box-shadow: 0 8px 24px rgba(0,0,0,.08);
  transform: translateY(-2px);
}

.learn-card-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #f4f4f5;
  overflow: hidden;
}
.learn-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.learn-card-thumb-fallback {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: #d1d1d6;
  font-size: 2.5rem;
}
.learn-card-play {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 48px; height: 48px;
  background: rgba(0,0,0,.7);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  transition: all .2s;
}
.learn-card:hover .learn-card-play {
  background: var(--accent, #00d4aa);
  color: #000;
  transform: translate(-50%, -50%) scale(1.1);
}
.learn-card-duration {
  position: absolute;
  bottom: 8px; right: 8px;
  background: rgba(0,0,0,.85);
  color: #fff;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: .7rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.learn-card-body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: .375rem;
}
.learn-card-cat {
  display: inline-flex;
  padding: .15rem .5rem;
  background: #f4f4f5;
  color: #3f3f46;
  border-radius: 999px;
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  align-self: flex-start;
}
.learn-card-cat.cat-tutorial { background: rgba(0,212,170,0.10); color: #00a080; }
.learn-card-cat.cat-demo { background: #e0f2fe; color: #0284c7; }
.learn-card-cat.cat-case-study { background: #f3e8ff; color: #9333ea; }
.learn-card-cat.cat-announcement { background: #fff3c4; color: #b58900; }

.learn-card-title {
  font-size: .95rem;
  font-weight: 700;
  color: #09090b;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.learn-card-desc {
  font-size: .8125rem;
  color: #6b7280;
  line-height: 1.55;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;  /* 2 → 3 line: 주요 기능 설명 표시 영역 확대 */
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (max-width: 768px) {
  .learn-grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .learn-card-title { font-size: .85rem; }
}
@media (max-width: 480px) {
  .learn-grid { grid-template-columns: 1fr; }
}