/* ── App Shell ── */
.f-app {
  display: flex; height: 100vh;
  background: linear-gradient(135deg, #1a2340 0%, #0d1018 100%);
  overflow: hidden; font-family: var(--font); position: relative;
}

/* ── Overlay (mobile sidebar backdrop) ── */
.f-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  z-index: 40; opacity: 0; pointer-events: none; transition: opacity .32s;
}
.f-overlay.show { opacity: 1; pointer-events: all; }

/* ── Main Column ── */
.f-main {
  flex: 1; display: flex; flex-direction: column;
  min-width: 0; height: 100vh; overflow: hidden;
}

/* ── Topbar ── */
.f-topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(13,16,24,.7); backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 10;
}
.f-menu-btn {
  background: none; border: none; cursor: pointer;
  padding: 6px; border-radius: 8px; transition: background .15s;
  flex-shrink: 0; line-height: 0; width: 32px;
}
.f-menu-btn:hover { background: rgba(255,255,255,.08); }
.f-topbar-center { flex: 1; display: flex; justify-content: center; }
.f-topbar-spacer { width: 32px; flex-shrink: 0; }

/* ── Feed Wrap + Scroll ── */
.f-wrap { display: flex; flex: 1; overflow: hidden; min-height: 0; }

.f-feed {
  flex: 1; overflow-y: scroll; min-height: 0;
  padding: 16px; display: flex; flex-direction: column; gap: 14px;
}
.f-feed::-webkit-scrollbar { width: 4px; }
.f-feed::-webkit-scrollbar-track { background: transparent; }
.f-feed::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 2px; }