/* =============================================================
   layout.css — app shell structural layout
   Sidebar left, main content right.
   ============================================================= */

/* ---- App shell -------------------------------------------- */
.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: var(--bg);
}

/* ---- Sidebar ---------------------------------------------- */
.sidebar {
  width: var(--sidebar-width);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow-y: auto;
  overflow-x: hidden;
  transition: width var(--transition-slow);
  z-index: 50;
}

.sidebar.collapsed {
  width: var(--sidebar-width-collapsed);
}

.sidebar__header {
  padding: 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  overflow: hidden;
}

.sidebar__logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.sidebar__logo-text {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: opacity var(--transition-slow);
}

.sidebar.collapsed .sidebar__logo-text {
  opacity: 0;
  pointer-events: none;
}

.sidebar__wordmark {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text);
  white-space: nowrap;
}

.sidebar__wordmark span {
  color: var(--accent);
}

.sidebar__role {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  white-space: nowrap;
}

.sidebar__nav {
  flex: 1;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}

.sidebar__nav-label {
  display: block;
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--muted);
  padding: 10px 8px 4px;
  white-space: nowrap;
  transition: opacity var(--transition-slow);
}

.sidebar.collapsed .sidebar__nav-label {
  opacity: 0;
}

.sidebar__nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
}

.sidebar__nav-item:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.sidebar__nav-item.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 500;
}

.sidebar__nav-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar__nav-label-text {
  transition: opacity var(--transition-slow);
  white-space: nowrap;
}

.sidebar.collapsed .sidebar__nav-label-text {
  opacity: 0;
}

.sidebar__footer {
  padding: 8px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.sidebar__collapse-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--muted);
  width: 100%;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar__collapse-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.sidebar__collapse-btn svg {
  flex-shrink: 0;
  transition: transform var(--transition-slow);
}

.sidebar.collapsed .sidebar__collapse-btn svg {
  transform: rotate(180deg);
}

/* ---- Main content ----------------------------------------- */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ---- Topbar ----------------------------------------------- */
.topbar {
  height: var(--topbar-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  flex-shrink: 0;
  gap: 12px;
  box-shadow: var(--shadow-sm);
}

.topbar__left,
.topbar__right {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.topbar__right {
  flex-shrink: 0;
}

/* ---- Page content ----------------------------------------- */
.page-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
}

.page-header__left { flex: 1; min-width: 0; }

.page-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* ---- Content grids ---------------------------------------- */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.settings-layout,
.alerts-layout {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---- Responsive ------------------------------------------- */
@media (max-width: 1024px) {
  .dashboard-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0; left: 0;
    height: 100vh;
    transform: translateX(-100%);
    width: var(--sidebar-width) !important;
    transition: transform var(--transition-slow);
  }
  .sidebar.mobile-open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }
  .page-content { padding: 16px; }
  .topbar { padding: 0 12px; }
}