/* css/home.css — home grid + cards.
   Two layouts:
     - Desktop ≥1100px : horizontal rails of cards (YT TV style)
     - Mobile  <1100px : vertical feed, full-width cards (YT mobile style) */

.row { margin-bottom: var(--row-gap); }

.row-title {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 24px;
  line-height: 32px;
  margin-bottom: 12px;
  color: var(--yt-text);
}

.row-rail {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  overflow-y: visible;
  scroll-padding-inline: 20px;
  padding: 0 20px 24px;
  scrollbar-width: none;
}
.row-rail::-webkit-scrollbar { display: none; }

/* ========== Card ========== */

.card {
  flex: 0 0 480px;
  scroll-snap-align: start;
  text-decoration: none;
  color: inherit;
  display: block;
  outline: 0;
  border-radius: 0;
  transition: transform 150ms cubic-bezier(.2,.7,.4,1);
}

.card:focus,
.card:focus-visible,
.card.is-focused {
  transform: scale(1.06);
  z-index: 2;
}
.card:focus .card-thumb,
.card:focus-visible .card-thumb,
.card.is-focused .card-thumb {
  outline: 4px solid #FFFFFF;
  outline-offset: 3px;
  box-shadow:
    0 0 32px rgba(255, 255, 255, 0.35),
    0 0 0 6px rgba(255, 255, 255, 0.12);
}
.card:focus .card-title,
.card:focus-visible .card-title,
.card.is-focused .card-title { color: #FFFFFF; }

.nav-item:focus,
.nav-item:focus-visible,
.nav-item.is-focused {
  background: #FFFFFF;
  color: #000000;
  outline: none;
}

.card-thumb {
  position: relative;
  width: 480px;
  height: 270px;
  background: var(--yt-surface);
  border-radius: var(--thumb-radius);
  overflow: hidden;
  margin-bottom: 12px;
}
.card-thumb-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0;
  transition: opacity 250ms ease;
}
.card-thumb-img.is-loaded { opacity: 1; }

.card-duration {
  position: absolute;
  right: 8px;
  bottom: 8px;
  background: rgba(0, 0, 0, 0.85);
  color: var(--yt-text);
  font-size: 14px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 0.2px;
}

.card-badge {
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}
.card-badge-new {
  background: var(--yt-red);
  color: #FFFFFF;
}

.card-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.25);
}
.card-progress > span {
  display: block;
  height: 100%;
  background: var(--yt-red);
}

/* Body row: avatar | text. Real YT mobile structure. */
.card-body {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 12px;
  align-items: start;
  padding: 0 4px 4px;
}
.card-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--yt-surface);
}
.card-avatar-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: 16px;
  color: var(--yt-text);
  background: #555;
}

.card-text {
  min-width: 0;
  grid-column: 2;
}
.card-title {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.3;
  color: #F1F1F1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 4px;
}
.card-meta {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--yt-text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Desktop refinements: bigger text since cards are bigger. */
@media (min-width: 1100px) {
  .card-title  { font-size: 22px; }
  .card-meta   { font-size: 16px; }
  .card-avatar { width: 40px; height: 40px; }
  .card-body   { grid-template-columns: 40px 1fr; gap: 14px; }
}

/* Mobile / tablet — each row is a responsive grid of cards. Real YouTube
   mobile uses 1-col portrait, 2-col landscape, 3-col tablet. CSS auto-fill
   gives this for free based on a min card width. */
@media (max-width: 1100px) {
  .row { margin-bottom: 24px; }
  .row-title { font-size: 16px; line-height: 22px; margin-bottom: 8px; padding: 0 12px; }
  .row-rail {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
    overflow: visible;
    padding: 0;
  }
  .card { flex-basis: auto; width: 100%; border-radius: 0; }
  .card-thumb {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    border-radius: var(--thumb-radius);
    margin-bottom: 8px;
  }
  .card-body { padding: 0 12px 4px; gap: 12px; grid-template-columns: 36px 1fr; }
  .card-title { font-size: 15px; line-height: 1.35; }
  .card-meta  { font-size: 12px; }
  .card:focus .card-thumb,
  .card:focus-visible .card-thumb,
  .card.is-focused .card-thumb { outline: 0; box-shadow: none; }
  .card:focus,
  .card:focus-visible,
  .card.is-focused { transform: none; }
}

/* True phone portrait — single column, full-width edge-to-edge thumbs. */
@media (max-width: 480px) {
  .row-rail { grid-template-columns: 1fr; }
}

/* ========== Channel browse (find surface) ========== */
.browse { padding: 0 20px 24px; }
.browse-heading { padding: 0; }
.browse-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 20px 16px;
}
.channel-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  text-decoration: none;
  color: inherit;
  padding: 16px 8px;
  border-radius: 12px;
  outline: 0;
  transition: transform 150ms cubic-bezier(.2,.7,.4,1), background 150ms;
}
.channel-tile:focus,
.channel-tile:focus-visible,
.channel-tile.is-focused {
  transform: scale(1.06);
  background: var(--yt-surface);
  z-index: 2;
}
.tile-avatar {
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--yt-surface);
  margin-bottom: 10px;
}
.tile-avatar-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  font-weight: 500;
  color: #fff;
  background: #555;
}
.channel-tile.is-focused .tile-avatar {
  outline: 4px solid #fff;
  outline-offset: 3px;
}
.tile-name {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  color: var(--yt-text);
  line-height: 1.25;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.tile-count { font-size: 12px; color: var(--yt-text-2); margin-top: 2px; }

.channel-head { display: flex; align-items: center; gap: 16px; padding: 0 20px; margin-bottom: 12px; }
.channel-head-avatar { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; background: var(--yt-surface); flex: 0 0 auto; }
.channel-head .row-title { margin-bottom: 0; }

/* On-screen Back (touch). No tabindex → the D-pad ignores it (TV uses the remote
   Back, already wired) so focus still lands on the first video, while touch users
   finally get a visible way back to the Channels grid. */
.head-back {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--yt-surface);
  color: var(--yt-text);
  text-decoration: none;
}
.head-back svg { width: 28px; height: 28px; }

/* Channel page = a real wrap-grid of uploads at ALL widths (not one endless
   horizontal rail). Scoped overrides force the cards fluid even on desktop/TV,
   where .card / .card-thumb are otherwise a fixed 480×270. */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  padding: 0 20px;
}
.channel-grid .card { flex: 0 0 auto; width: 100%; }
.channel-grid .card-thumb { width: 100%; height: auto; aspect-ratio: 16 / 9; }
@media (min-width: 1100px) {
  .channel-grid { grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 24px; }
}
@media (max-width: 1100px) {
  .channel-grid { padding: 0 12px; }
}

@media (max-width: 1100px) {
  .browse-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .browse { padding: 0 12px 24px; }
  .tile-avatar { width: 72px; height: 72px; }
  .tile-name { font-size: 13px; }
  .channel-head { padding: 0 12px; }
  .channel-head-avatar { width: 52px; height: 52px; }
}

/* ========== Tag search (chips + text box) ========== */
.search-view { padding: 0 20px 24px; }
.search-bar {
  display: flex; align-items: center; gap: 12px;
  background: var(--yt-surface); border-radius: 999px;
  padding: 0 20px; height: 56px; max-width: 720px; margin: 0 0 20px;
}
.search-bar:focus-within { outline: 2px solid rgba(255,255,255,0.6); }
.search-bar-icon { width: 24px; height: 24px; color: var(--yt-text-2); flex: 0 0 auto; }
.search-input {
  flex: 1 1 auto; min-width: 0; background: transparent; border: 0; outline: 0;
  color: var(--yt-text); font-family: var(--font-body); font-size: 20px;
}
.search-input::placeholder { color: var(--yt-text-3); }
.search-input.is-focused { outline: 0; }
.search-chips { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px; }
.search-chip {
  font-family: var(--font-body); font-size: 16px; font-weight: 500;
  color: var(--yt-text); background: var(--yt-surface);
  border: 0; border-radius: 999px; padding: 10px 18px; cursor: pointer;
  outline: 0; white-space: nowrap;
  transition: transform 120ms cubic-bezier(.2,.7,.4,1), background 120ms;
}
.search-chip:focus,
.search-chip:focus-visible,
.search-chip.is-focused { background: #fff; color: #000; transform: scale(1.06); }
.search-results { min-height: 40px; }
.search-empty { display: flex; justify-content: center; padding: 28px 4px; color: var(--yt-text-3); }
@media (max-width: 1100px) {
  .search-view { padding: 0 12px 24px; }
  .search-bar { height: 48px; }
  .search-input { font-size: 16px; }
  .search-chip { font-size: 14px; padding: 8px 14px; }
}