/* ==========================================================================
   GirafPingvin — Stories feed
   Instagram-style vertical grid + infinite scroll.
   (Fullscreen viewer reuses .story-viewer from style.css)
   NOTE: no backdrop-filter on tiles — repeated blurred layers thrash Chrome.
   ========================================================================== */

/* ── Hero ──────────────────────────────────────────────────────────── */
.st-hero {
  text-align: center;
  padding: 1rem 0 1.5rem;
}

.st-hero__eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
}

.st-hero__title {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-heading);
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.05;
  margin: 0 0 0.6rem;
  background: linear-gradient(95deg, #FF6B9D, #FFB347, #6BB5FF);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.st-hero__sub {
  max-width: 540px;
  margin: 0 auto;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--color-text-muted);
}

/* ── Feed grid ─────────────────────────────────────────────────────── */
.st-feed {
  padding-bottom: 3rem;
}

.st-feed__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.85rem;
  align-items: start;
}

/* Date divider spanning the full row */
.st-feed__divider {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin: 0.75rem 0 0.1rem;
}

.st-feed__divider:first-child {
  margin-top: 0;
}

.st-feed__divider span {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.st-feed__divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--color-border, rgba(0, 0, 0, 0.12)), transparent);
}

/* ── Tile ──────────────────────────────────────────────────────────── */
.st-tile {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 9 / 16;
  padding: 0;
  border: none;
  border-radius: var(--radius-md, 16px);
  overflow: hidden;
  cursor: pointer;
  background: rgba(0, 0, 0, 0.06);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.3s ease;
}

.st-tile:hover {
  transform: translateY(-4px) scale(1.015);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
}

.st-tile:active {
  transform: scale(0.98);
}

.st-tile:focus-visible {
  outline: 3px solid #FF6B9D;
  outline-offset: 2px;
}

.st-tile__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
}

/* Video play badge */
.st-tile__badge {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  pointer-events: none;
}

/* Pop-in for lazily appended tiles */
.st-tile--new {
  animation: st-pop-in 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes st-pop-in {
  from { opacity: 0; transform: scale(0.85) translateY(10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

/* ── Loader / end ──────────────────────────────────────────────────── */
.st-feed__sentinel {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 64px;
  margin-top: 1.5rem;
}

.st-feed__sentinel.is-done {
  display: none;
}

.st-feed__loader {
  display: flex;
  gap: 6px;
  align-items: center;
}

.st-feed__loader span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-text-muted);
  opacity: 0.4;
  animation: st-loader-bounce 1s ease-in-out infinite;
}

.st-feed__loader span:nth-child(2) { animation-delay: 0.15s; }
.st-feed__loader span:nth-child(3) { animation-delay: 0.3s; }

@keyframes st-loader-bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.3; }
  40% { transform: scale(1); opacity: 0.85; }
}

.st-feed__end {
  display: none;
  text-align: center;
  margin: 1.75rem 0 0;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

.st-feed__end.is-visible {
  display: block;
}

/* ── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .st-feed__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
  }

  .st-tile {
    border-radius: 12px;
  }
}

@media (max-width: 380px) {
  .st-feed__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── Dark mode ─────────────────────────────────────────────────────── */
[data-mode="dark"] .st-tile {
  background: rgba(255, 255, 255, 0.06);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}

[data-mode="dark"] .st-tile:hover {
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45);
}

[data-mode="dark"] .st-feed__divider::after {
  background: linear-gradient(to right, rgba(255, 255, 255, 0.16), transparent);
}