/* BUILD 255 — Featured Series section (체계화 — 4 시리즈 × 진입 카드) */

.featured-series {
  padding: 4rem 1.5rem 3rem;
  background: #fff;
}

.featured-series__container {
  max-width: 1200px;
  margin: 0 auto;
}

.featured-series__header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.featured-series__header h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin: 0 0 0.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary, #1a1a2e);
}

.featured-series__header p {
  font-size: 1.05rem;
  color: var(--text-secondary, #5a5a6e);
  margin: 0;
}

.featured-series__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .featured-series__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1080px) {
  .featured-series__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.series-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: 1.5rem 1.35rem;
  background: linear-gradient(180deg, #fff 0%, #fafaff 100%);
  border: 1px solid rgba(120, 80, 200, 0.12);
  border-radius: 16px;
  text-decoration: none;
  color: #1a1a2e;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.series-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.06) 0%, rgba(236, 72, 153, 0.04) 100%);
  opacity: 0;
  transition: opacity 0.25s ease;
  pointer-events: none;
}

.series-card:hover {
  border-color: #8b5cf6;
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(139, 92, 246, 0.15);
}

.series-card:hover::before {
  opacity: 1;
}

.series-card__emoji {
  font-size: 2.25rem;
  line-height: 1;
  position: relative;
}

.series-card__label {
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  position: relative;
}

.series-card__tagline {
  font-size: 0.9rem;
  color: #5a5a6e;
  line-height: 1.5;
  position: relative;
  margin-bottom: 0.25rem;
}

.series-card__meta {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #8b5cf6;
  position: relative;
  margin-top: auto;
}

.series-card__start {
  font-size: 0.92rem;
  font-weight: 700;
  color: #1a1a2e;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(120, 80, 200, 0.12);
  position: relative;
  transition: color 0.2s ease;
}

.series-card:hover .series-card__start {
  color: #8b5cf6;
}

.featured-series__footer {
  text-align: center;
  margin-top: 2rem;
}

.featured-series__view-all {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: transparent;
  color: #8b5cf6;
  border: 2px solid rgba(139, 92, 246, 0.25);
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.2s ease;
}

.featured-series__view-all:hover {
  background: #8b5cf6;
  color: #fff;
  border-color: #8b5cf6;
  transform: translateY(-2px);
}