/* Collection show page — Series & Playlists (feature 007). Page-scoped
   (Constitution IV). Mobile-first: episode cards are horizontal rows; at desktop
   they become square poster-style tiles. Tokens from shared/variables. */

.collection {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-12);
}

/* --- Hero: centered thumbnail of the latest-watched (or poster/first) video --- */
.collection__hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--space-5);
}
/* Names the video the hero thumbnail links to. */
.collection__hero-caption {
  margin-top: var(--space-2);
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--text-meta, 0.85rem);
}
.collection__hero-link {
  display: block;
  width: min(320px, 70vw);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
}
.collection__hero-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

/* --- Head: title (left) + Play/Continue (right) --- */
.collection__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.collection__title { font-size: var(--text-h1, 1.6rem); min-width: 0; }

/* Play/Continue button (US2): right of the title. */
.collection__play {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex: 0 0 auto;
  white-space: nowrap;
}
.collection__play .icon { width: 18px; height: 18px; }

/* --- Seasons carousel (series only) — self-contained horizontal scroller --- */
.seasons { margin-bottom: var(--space-5); }
.seasons__bar { display: flex; align-items: center; gap: var(--space-2); }
.seasons__track {
  display: flex;
  gap: var(--space-2);
  overflow-x: auto;
  scroll-behavior: smooth;
  scrollbar-width: none;
  flex: 1 1 auto;
}
.seasons__track::-webkit-scrollbar { display: none; }
.season-chip {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}
.season-chip.is-active {
  background: var(--accent-blue);
  color: var(--text-primary);
  border-color: var(--accent-blue);
}
.seasons__arrows { display: flex; gap: var(--space-1); flex: 0 0 auto; }
.seasons__arrow {
  background: var(--surface-2);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-pill);
  width: 32px;
  height: 32px;
  cursor: pointer;
}
.seasons__arrow:hover { color: var(--text-primary); }

/* --- Episodes region + loading state (season swap / page fetch) --- */
turbo-frame#episodes[aria-busy="true"] { opacity: 0.5; }
turbo-frame#episodes[aria-busy="true"]::after {
  content: "";
  display: block;
  width: 28px;
  height: 28px;
  margin: var(--space-6) auto;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: collection-spin 0.7s linear infinite;
}
@keyframes collection-spin { to { transform: rotate(360deg); } }

/* --- Episodes grid (mobile: stacked rows) --- */
.episode-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
/* Loaded frames are layout-transparent so cards flow into the grid; the still-
   loading lazy frame keeps a box so Turbo can observe it and auto-load. */
.episode-grid turbo-frame { display: contents; }
.episode-grid turbo-frame[src]:not([complete]) { display: block; }
.episode-grid .pagination-loader { padding: var(--space-5); color: var(--text-tertiary); }

/* --- Episode card (mobile: horizontal row) --- */
.episode-card {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-2);
  border-radius: var(--radius-card);
  border: 2px solid transparent;
  background: var(--surface-1);
  color: var(--text-primary);
}
.episode-card__media {
  position: relative;
  flex: 0 0 40%;
  max-width: 160px;
  border-radius: var(--radius-tile);
  overflow: hidden;
}
.episode-card__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}
.episode-card__img--placeholder { background: var(--surface-3); }
.episode-card__body { min-width: 0; }
.episode-card__title {
  font-size: var(--text-h3, 1rem);
  margin-bottom: var(--space-1);
}
.episode-card__desc {
  color: var(--text-tertiary);
  font-size: var(--text-meta, 0.85rem);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
/* Current-episode marker (US5): blue outline + play state badge. */
.episode-card { position: relative; }
.episode-card--current { border-color: var(--accent-blue); }
/* Mobile: the play state sits at the right of the row. */
.episode-card__state {
  flex: 0 0 auto;
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.episode-card__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-pill);
  background: var(--accent-blue);
  color: var(--text-primary);
}
.episode-card__badge .icon { width: 16px; height: 16px; }

/* ============================ Desktop ============================ */
@media (min-width: 768px) {
  /* Episodes become a grid of square poster-style tiles (like the home rails). */
  .episode-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
  }
  .episode-grid turbo-frame { display: contents; }
  .episode-grid turbo-frame[src]:not([complete]) { display: block; grid-column: 1 / -1; }
  .episode-grid .pagination-loader { grid-column: 1 / -1; }

  /* Card: thumbnail full-width on top, title + description below. */
  .episode-card {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    padding: var(--space-2);
  }
  .episode-card__media { flex: none; max-width: none; width: 100%; }
  .episode-card__body { padding: 0 var(--space-1) var(--space-1); }

  /* The play state overlays the thumbnail (covers the media box, badge centered). */
  .episode-card__state {
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    right: var(--space-2);
    aspect-ratio: 16 / 9;
    height: auto;
    margin: 0;
  }
  .episode-card__badge { width: 52px; height: 52px; }
  .episode-card__badge .icon { width: 20px; height: 20px; }
}
@media (min-width: 1024px) {
  .episode-grid { grid-template-columns: repeat(4, 1fr); }
}

/* --- Empty state --- */
.collection__empty {
  color: var(--text-tertiary);
  padding: var(--space-8) 0;
  text-align: center;
}

/* Save ("grab"/"clone") a public playlist into your own account. */
.collection__save { display: inline-flex; align-items: center; gap: var(--space-2); }
.collection__save .icon { width: 16px; height: 16px; }
.collection__save-form { margin: 0; }