/* タイムライン固有のレイアウト。共通部品はsienta-shared.css参照。 */
.sn-timeline { max-width: 480px; position: relative; padding-bottom: 60px; }

.sn-filterbar { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 8px; margin-bottom: 10px; }
.sn-filterbar::-webkit-scrollbar { display: none; }
.sn-pill {
  flex: 0 0 auto;
  border: 1px solid var(--sn-line-strong);
  background: var(--sn-surface);
  color: var(--sn-ink-soft);
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 12.5px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
}
.sn-pill.sn-active { background: var(--sn-accent); color: var(--sn-accent-ink); border-color: var(--sn-accent); }

.sn-author-row { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.sn-who { display: flex; flex-direction: column; flex: 1; }
.sn-who b { font-size: 13px; }
.sn-who span { font-size: 11px; color: var(--sn-ink-faint); }

.sn-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--sn-accent);
  color: var(--sn-accent-ink);
  border: none;
  border-radius: 999px;
  padding: 14px 20px;
  font-size: 13.5px;
  font-weight: 800;
  box-shadow: 0 8px 20px -6px rgba(0,0,0,.35);
  cursor: pointer;
}

.sn-sheet-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(12,14,16,.4);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s ease;
  z-index: 1000;
}
.sn-sheet-backdrop.sn-open { opacity: 1; pointer-events: auto; }
.sn-sheet {
  width: 100%;
  max-width: 480px;
  background: var(--sn-surface);
  border-radius: 20px 20px 0 0;
  padding: 10px 18px 22px;
}
.sn-sheet-handle { width: 36px; height: 4px; border-radius: 3px; background: var(--sn-line-strong); margin: 6px auto 14px; }
.sn-sheet-title { font-size: 15px; font-weight: 800; margin-bottom: 14px; }
.sn-sheet-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.sn-sheet-grid button {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--sn-line);
  background: var(--sn-surface-sunk);
  border-radius: var(--sn-radius-md);
  padding: 14px 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--sn-ink);
  cursor: pointer;
}
.sn-sheet-grid button span { font-size: 20px; }

.sn-composer textarea { width: 100%; margin-bottom: 10px; }