/*
 * Phone feed: full-screen snapping slides (spec "Mobile layout" > "Full-screen
 * feed", ADR 0001). Ported from the mockup's .reel / .slide / .sl-* rules with
 * the `slide-` and `reel-` prefixes, tokens only. White, the dark fades and the
 * dark glass over photos and video come from the --on-media / --media-* tokens.
 * Only rendered at 760px and below (AppShell measures .app).
 */
@keyframes slide-rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes slide-shimmer { from { background-position: 120% 0; } to { background-position: -100% 0; } }

.reel-feed {
  position: relative;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
}

.reel {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  overscroll-behavior: contain;
  scrollbar-width: none;
}
.reel::-webkit-scrollbar { display: none; }

.slide {
  --slide-text-bg: radial-gradient(120% 70% at 0% 0%, var(--accent-soft), transparent 62%), var(--bg);
  position: relative;
  height: 100%;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  overflow: hidden;
  background: var(--slide-text-bg);
  color: var(--ink);
}

/* Media: edge to edge. Scaled to 104% until the slide is on screen, then eases to 100%. */
.slide-media { position: absolute; inset: 0; background: var(--tile-3); }
.slide-art {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.04);
  transition: transform 6s ease-out;
}
.is-cur .slide-art { transform: scale(1); }
.slide-video .slide-art video,
.slide-video .slide-art img { display: block; width: 100%; height: 100%; object-fit: cover; }
.slide-video .slide-art > div { height: 100%; }
.slide-pending { display: grid; place-items: center; color: var(--ink-2); font-size: 14px; }
.slide-play { z-index: 4; }
.slide-dur { top: 128px; right: 16px; z-index: 4; }

/* Several media items: a sideways snap track; each pane is one full-slide item. */
.slide-track {
  position: absolute;
  inset: 0;
  display: flex;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}
.slide-track::-webkit-scrollbar { display: none; }
.slide-pane { position: relative; flex: 0 0 100%; height: 100%; scroll-snap-align: start; scroll-snap-stop: always; }
.slide-dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 90px;
  z-index: 4;
  display: flex;
  justify-content: center;
  gap: 5px;
  pointer-events: none;
}
.slide-dot {
  display: block;
  width: 5px;
  height: 5px;
  border-radius: 3px;
  background: var(--on-media-line);
  transition: width .5s var(--ease), background-color .5s;
}
.slide-dot-on { width: 18px; background: var(--accent); }

.slide-scrim,
.slide-scrim-top { position: absolute; left: 0; right: 0; z-index: 1; pointer-events: none; }
.slide-scrim { bottom: 0; height: 58%; background: linear-gradient(180deg, var(--media-fade-0), var(--media-fade)); }
.slide-scrim-top { top: 0; height: 150px; background: linear-gradient(180deg, var(--media-fade-top), var(--media-fade-0)); }

/* A playing video: the author, text and fades step aside so the native controls are clear. */
.slide-meta,
.slide-scrim,
.slide-scrim-top { transition: opacity .3s var(--ease); }
.slide-playing .slide-meta,
.slide-playing .slide-scrim,
.slide-playing .slide-scrim-top { opacity: 0; pointer-events: none; }
.slide-playing .slide-meta > * { pointer-events: none; }

/* Author and text over the bottom fade. */
.slide-meta {
  position: absolute;
  left: 20px;
  right: 24px;
  bottom: 108px;
  z-index: 3;
  display: flex;
  flex-direction: column;
  gap: 12px;
  pointer-events: none;
}
.slide-meta > * { pointer-events: auto; }
.slide-on-media .slide-meta { color: var(--on-media); }
.slide-who { display: flex; align-items: center; gap: 12px; }
.slide-who > div { display: flex; flex-direction: column; min-width: 0; }
.slide-who strong { display: flex; align-items: center; font-size: 15px; font-weight: 700; }
.slide-who time { font-size: 12.5px; opacity: .72; }
.slide-on-media .slide-you { color: var(--on-media); box-shadow: inset 0 0 0 1px var(--on-media-badge); }
.slide-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-shadow: 0 1px 12px var(--media-shadow);
}
.slide-error { margin: 0; color: var(--danger); font-size: 13px; font-weight: 600; }
.slide-on-media .slide-error { color: var(--on-media); }

/* Text-only post: the text is the hero, a serif quote with a crimson opening mark. */
.slide-quote-w { position: absolute; inset: 0; z-index: 2; pointer-events: none; }
.slide-quote {
  position: absolute;
  left: 24px;
  right: 28px;
  top: 46%;
  transform: translateY(-50%);
  margin: 0;
  font-family: var(--font-serif), Georgia, serif;
  font-size: 31px;
  font-weight: 600;
  line-height: 1.2;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  display: -webkit-box;
  -webkit-line-clamp: 8;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.slide-quote::before {
  content: "\201C";
  display: block;
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 84px;
  line-height: .62;
}

/* The slide on screen: its content rises in when it snaps into place. */
.is-cur .slide-meta,
.is-cur .slide-quote-w { animation: slide-rise .7s var(--ease) both; }
/* The rise animation's fill would keep the meta visible; a playing video takes it off. */
.is-cur.slide-playing .slide-meta { animation: none; }

/* Own-post menu: frosted "..." at the top right, the card's delete confirm under it. */
.slide-menu { position: absolute; top: 70px; right: 12px; z-index: 6; }
.slide-menu-btn {
  appearance: none;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 14px;
  color: var(--ink);
  background: var(--glass);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  backdrop-filter: blur(16px) saturate(1.6);
  box-shadow: inset 0 0 0 1px var(--line);
  cursor: pointer;
  transition: transform .15s, background-color .2s;
}
.slide-menu-btn svg { width: 20px; height: 20px; }
.slide-menu-btn:active { transform: scale(.92); }
.slide-menu-btn:disabled { cursor: default; }
.slide-on-media .slide-menu-btn {
  color: var(--on-media);
  background: var(--media-glass);
  box-shadow: inset 0 0 0 1px var(--on-media-line);
}
.slide-menu .post-pop { min-width: 230px; }

/* Double-tap heart burst over a post slide (mockup .burst), crimson accent. */
@keyframes slide-burst {
  0% { opacity: 0; transform: scale(.2); }
  25% { opacity: 1; transform: scale(1.15); }
  60% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.25) translateY(-20px); }
}
.slide-burst {
  position: absolute;
  left: 50%;
  top: 44%;
  width: 120px;
  height: 120px;
  margin: -60px 0 0 -60px;
  color: var(--accent);
  z-index: 5;
  pointer-events: none;
  animation: slide-burst .95s cubic-bezier(.2, .9, .3, 1.3) both;
  filter: drop-shadow(0 12px 30px color-mix(in oklab, var(--accent), transparent 45%));
}

/* Featured experts slide: not a post. Eyebrow, title, carousel at 156px, hint. */
@keyframes slide-nudge { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(4px); } }
.slide-featured {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 70px 0 110px;
  background: radial-gradient(90% 55% at 50% 46%, color-mix(in oklab, var(--accent), transparent 84%), transparent 70%), var(--bg);
}
.slide-feat-title {
  margin: 10px 24px 0;
  text-align: center;
  font-size: 32px;
  line-height: 1.1;
  color: var(--ink);
}
.slide-feat-cf { width: 100%; margin-top: 26px; }
.featured-bare { background: none; }
.featured-bare .featured-cap { padding-top: 16px; }
.slide-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--ink-3);
}
.slide-hint svg { width: 16px; height: 16px; animation: slide-nudge 1.6s ease-in-out infinite; }

/* Loading slide: a skeleton card in the middle while the next page loads. */
.slide-load { background: var(--bg); }
.slide-load .sentinel { position: absolute; top: 0; left: 0; right: 0; }
.slide-load-body {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding: 0 22px 110px;
}
.slide-skel {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
}
.slide-skel-head { display: flex; align-items: center; gap: 12px; }
.slide-skel-lines { flex: 1; display: flex; flex-direction: column; gap: 8px; }
.slide-skel i {
  display: block;
  height: 12px;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--tile-2) 0%, var(--tile-3) 40%, var(--tile-2) 80%);
  background-size: 220% 100%;
  animation: slide-shimmer 1.4s linear infinite;
}
.slide-skel .slide-skel-hex {
  flex: none;
  width: 46px;
  height: 53px;
  border-radius: 0;
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
}

/* Empty feed or a failed page, as a slide. */
.slide-message {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0 24px 110px;
  text-align: center;
  color: var(--ink-3);
}

/* New-posts pill floats over the top of the reel. */
.reel-pill {
  position: absolute;
  top: 76px;
  left: 0;
  right: 0;
  z-index: 8;
  display: flex;
  justify-content: center;
  pointer-events: none;
  animation: feed-pill-in .45s var(--ease) backwards;
}
.reel-pill > * { pointer-events: auto; }

/* Bottom dock (spec "Bottom dock"): a frosted bar 16px above the bottom. Like and
   comments act on the post on screen. Disabled buttons stay fully opaque and use
   a solid muted ink instead of fading. */
.dock {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: calc(16px + env(safe-area-inset-bottom, 0px));
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  border-radius: 22px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  backdrop-filter: blur(24px) saturate(1.8);
  box-shadow: var(--shadow-pop), inset 0 0 0 1px var(--line);
}
.dk {
  appearance: none;
  flex: 1;
  min-width: 44px;
  height: 52px;
  padding: 0;
  border: 0;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  transition: background-color .25s, color .25s;
}
.dk svg { width: 22px; height: 22px; flex: none; }
@media (hover: hover) { .dk:hover:not(:disabled) { background: var(--tile-3); } }
.dk:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
.dk.dk-like-on { color: var(--accent); }
.dk-beat svg { animation: post-beat .5s cubic-bezier(.2,.9,.3,1.4); }
.dk:disabled { opacity: 1; color: var(--ink-3); cursor: default; }
.btn-spark.btn-spark-fab.dk-plus { flex: 0 0 64px; width: 64px; height: 52px; }

@media (prefers-reduced-motion: reduce) {
  .is-cur .slide-meta,
  .is-cur .slide-quote-w,
  .slide-skel i,
  .slide-burst,
  .slide-hint svg,
  .reel-pill,
  .dk-beat svg { animation: none !important; }
  .slide-art { transition: none !important; }
}