frontend-helper/src/styles/layout.css

/* Signed-in shell (spec "Desktop and tablet layout", ADR 0001 sections 3 and 6).
   .app is the size container; .bento is its child, so container queries can
   style it. The page never scrolls: only the panels' own lists do. */

.app {
  container: app / inline-size;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  transition: background-color .45s, color .45s;
}

/* Below 1001px the tablet and phone tasks own the layout. Until then the
   panels stack in one column that scrolls inside the app frame. */
.bento {
  height: 100%;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
}

.bento-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  min-height: 0;
}

/* 761px to 1000px: the feed spans the full height on the left; the account and
   search panels stack over the featured and trending panels on the right. */
@container app (max-width: 1000px) and (min-width: 761px) {
  .bento {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    grid-template-rows: auto minmax(0, 1fr);
    overflow: hidden;
  }
  .bento-center { grid-column: 1; grid-row: 1 / 3; height: 100%; }
  .bento-left { grid-column: 2; grid-row: 1; }
  .bento-right { grid-column: 2; grid-row: 2; overflow-y: auto; overscroll-behavior: contain; }
  .bento-left .expert-search { flex: 0 1 auto; max-height: 250px; }
  .bento-right .rail-trending { flex: 1 0 200px; }
  .bento .account-live { display: none; }
}

/* 1001px to 1180px: three columns, narrower sides. */
@container app (min-width: 1001px) {
  .bento {
    display: grid;
    grid-template-columns: 244px minmax(0, 1fr) 292px;
    overflow: hidden;
  }
  .bento-col { height: 100%; }
}

/* 1181px and wider. */
@container app (min-width: 1181px) {
  .bento { grid-template-columns: 272px minmax(0, 1fr) 324px; }
}

/* Panels ----------------------------------------------------------------- */

.tile {
  position: relative;
  min-height: 0;
  background: var(--tile);
  border: 1px solid var(--line);
  border-radius: var(--r-panel);
  box-shadow: var(--shadow-tile);
  transition: background-color .45s, border-color .45s;
}

.panel { display: flex; flex-direction: column; }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 18px 18px 12px;
}
.panel-head h2 { margin: 0; font-size: 21px; }

/* A list that scrolls inside its panel. */
.panel-scroll {
  flex: 1 1 0;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line-2) transparent;
  scroll-behavior: smooth;
}

/* Faded top and bottom edges on a scrolling list. The mask color is only an
   alpha source, it is never painted. */
.fade-edges {
  -webkit-mask-image: linear-gradient(to bottom, transparent 0, black 16px, black calc(100% - 32px), transparent 100%);
  mask-image: linear-gradient(to bottom, transparent 0, black 16px, black calc(100% - 32px), transparent 100%);
}

/* Which panels grow to fill their column. */
.bento-left .expert-search { flex: 1 1 0; }
.bento-center .feed { flex: 1 1 0; }
.bento-right { justify-content: flex-start; }
.bento-right .rail-featured { flex: none; }
.bento-right .rail-trending { flex: 1 1 0; }

/* Panel contents keep their inner padding off the scroll edge. */
.expert-search .search-form { margin: 0 14px; display: flex; flex-direction: column; }
.expert-search .search-form input { width: 100%; }
.expert-search .chips { padding: 0 14px; }
.expert-search .search-results { padding: 12px 14px 24px; }
.rail .rail-list { padding: 4px 14px 24px; }
.feed .composer { margin: 0 14px 4px; }
.feed .feed-list { display: flex; flex-direction: column; gap: 16px; padding: 16px 14px 32px; }

/* 760px and below: the full-screen feed (spec "Mobile layout"). The feed
   column fills the app frame and the reel inside it is the only scroller.
   The side panels are hidden; the phone dock and sheets reach them later. */
@container app (max-width: 760px) {
  .bento { display: block; padding: 0; overflow: hidden; }
  .bento-left,
  .bento-right { display: none; }
  .bento-center { height: 100%; }
}

/* Account panel ---------------------------------------------------------- */

.account { flex: none; }

.account-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 12px 12px 16px;
}
.account-word { flex: 1; font-size: 15px; }

.account-theme {
  appearance: none;
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: var(--r-ctl);
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  transition: background-color .2s, color .2s, transform .15s;
}
.account-theme:hover { background: var(--tile-2); color: var(--ink); }
.account-theme:active { transform: scale(.9); }
.account-theme svg { width: 20px; height: 20px; }

.account-me {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 12px;
  padding: 12px;
  border-radius: 14px;
  background: var(--tile-2);
}
.account-me-text { display: flex; flex-direction: column; min-width: 0; }
.account-me-text strong { font-size: 14px; }
.account-me-text span {
  font-size: 12.5px;
  color: var(--ink-3);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.account-live {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px 16px;
  font-size: 12.5px;
  color: var(--ink-3);
}
.account-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: account-ping 2.2s infinite;
}
@keyframes account-ping {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent), transparent 45%); }
  70% { box-shadow: 0 0 0 8px color-mix(in srgb, var(--accent), transparent 100%); }
  100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent), transparent 100%); }
}

@media (prefers-reduced-motion: reduce) {
  .account-dot { animation: none !important; }
  .panel-scroll { scroll-behavior: auto !important; }
}