/* ============================================================
   QB ALB — Layout System (White Theme Multi-Column)
   ============================================================ */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--topbar-height) 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar content";
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background-color: var(--background);
}

/* ── LEFT SIDEBAR (White Theme) ────────────────────────────── */

.sidebar-nav {
  grid-area: sidebar;
  background-color: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: var(--z-nav);
}

.sidebar-nav__header {
  padding: 0 var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--border);
  height: var(--topbar-height);
  background-color: var(--surface);
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
  color: var(--primary);
}

.sidebar-logo-text {
  display: flex;
  flex-direction: column;
}

.sidebar-logo-text strong {
  font-size: var(--text-base);
  font-weight: var(--weight-extrabold);
  color: var(--primary);
  line-height: 1.1;
}

.sidebar-logo-text span {
  font-size: 0.65rem;
  color: var(--text-secondary);
  font-weight: var(--weight-bold);
  letter-spacing: 0.05em;
}

/* Sidebar Menu Items (White theme with green active pills) */
.sidebar-nav__menu {
  flex: 1;
  padding: var(--space-3) var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-nav__section-label {
  font-size: 0.65rem;
  font-weight: var(--weight-bold);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-4) var(--space-3) var(--space-2);
}

.sidebar-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.6rem var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
}

.sidebar-nav__link:hover {
  background-color: var(--surface-hover);
  color: var(--text-primary);
}

.sidebar-nav__link--active {
  background-color: var(--primary-light) !important;
  color: var(--primary) !important;
  font-weight: var(--weight-semibold);
}

.sidebar-nav__link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: inherit;
}

/* Sidebar Footer (User Card in Mockup) */
.sidebar-nav__footer {
  margin: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  background-color: var(--surface-muted);
  transition: background-color var(--transition-fast);
}

.sidebar-nav__footer:hover {
  background-color: var(--surface-hover);
}

.sidebar-nav__footer-name {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
}

.sidebar-nav__footer-role {
  font-size: 0.65rem;
  color: var(--text-secondary);
}

/* ── TOP BAR (White Theme) ────────────────────────────────── */

.top-bar {
  grid-area: topbar;
  background-color: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  gap: var(--space-4);
  z-index: var(--z-nav);
}

.top-bar__search {
  flex: 1;
  max-width: 320px;
}

.top-bar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.top-bar__user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.top-bar__user-name {
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
}

/* ── CONTENT CONTAINER ────────────────────────────────────── */

.content-pane {
  grid-area: content;
  overflow-y: auto;
  background-color: var(--background);
}

.view-container {
  display: none;
  animation: fade-in 0.15s ease-out;
  height: 100%;
}

.view-container--active {
  display: block;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── THREE COLUMN GRID ──────────────────────────────────────── */

.feed-page-grid {
  display: grid;
  grid-template-columns: 1fr var(--right-panel-width);
  gap: var(--space-4);
  padding: var(--space-4);
  max-width: 100%;
  margin: 0 auto;
  align-items: start;
  transition: grid-template-columns var(--transition-base);
}

/* When profile split column is active */
.feed-page-grid--profile-active {
  grid-template-columns: 1fr var(--right-panel-width) var(--profile-panel-width);
}

.feed-main-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  min-width: 0;
}

.feed-right-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: sticky;
  top: var(--space-4);
}

.feed-profile-col {
  display: none;
  flex-direction: column;
  gap: var(--space-4);
  position: sticky;
  top: var(--space-4);
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  height: calc(100vh - var(--topbar-height) - 32px);
  overflow-y: auto;
}

.feed-page-grid--profile-active .feed-profile-col {
  display: flex;
}

/* ── RESPONSIVE MOBILE OVERLAYS ────────────────────────────── */

.mobile-header { display: none; }
.mobile-bottom-nav { display: none; }

@media (max-width: 1024px) {
  .feed-page-grid--profile-active {
    grid-template-columns: 1fr var(--right-panel-width);
  }
  .feed-profile-col {
    display: none !important; /* Hide 3rd column, fall back to modal or standard page overlay */
  }
}

@media (max-width: 768px) {
  body { overflow: auto; }
  
  .app-shell {
    display: flex;
    flex-direction: column;
    height: auto;
    min-height: 100vh;
  }
  
  .sidebar-nav, .top-bar { display: none !important; }
  
  .mobile-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--primary);
    color: #fff;
    padding: 0 var(--space-4);
    height: 52px;
    position: sticky;
    top: 0;
    z-index: var(--z-nav);
  }
  
  .mobile-header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
  }
  
  .mobile-header__logo strong {
    font-size: var(--text-md);
    font-weight: var(--weight-extrabold);
  }
  
  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--bottom-nav-height);
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    z-index: var(--z-nav);
    justify-content: space-around;
    align-items: center;
  }
  
  .mobile-bottom-nav__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    gap: 2px;
    color: var(--text-secondary);
    font-size: 0.65rem;
    cursor: pointer;
  }
  
  .mobile-bottom-nav__item svg { width: 18px; height: 18px; }
  .mobile-bottom-nav__item--active { color: var(--primary); }
  
  .content-pane {
    flex: 1;
    overflow-y: visible;
    padding-bottom: calc(var(--bottom-nav-height) + 12px);
  }
  
  .feed-page-grid {
    grid-template-columns: 1fr !important;
    padding: var(--space-3);
  }
  
  .feed-right-col, .feed-profile-col { display: none !important; }
}