/* ============================================================
   APP SHELL LAYOUT
   Grid: [sidebar | main-wrapper]
   Main-wrapper: [header / page-content]
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

html, body {
  height: 100%;
  font-family: var(--font-family);
  font-size: var(--text-base);
  color: var(--clr-text-primary);
  background: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
}

/* ── Offline banner ─────────────────────────────────────────── */
.offline-banner {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-offline);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-4);
  background: var(--clr-warning);
  color: hsl(38, 90%, 15%);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}
.offline-banner__icon { font-size: var(--text-md); }

/* ── App shell: sidebar + main ──────────────────────────────── */
.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── Sidebar ────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--clr-sidebar-bg);
  overflow-y: auto;
  overflow-x: hidden;
  z-index: var(--z-sidebar);
  transition: width var(--transition-base);
}

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

/* Brand / logo strip */
.sidebar__brand {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-6) var(--sp-5);
  border-bottom: 1px solid var(--clr-sidebar-border);
  text-decoration: none;
  flex-shrink: 0;
}
.sidebar__brand-icon {
  width: 32px; height: 32px;
  background: var(--clr-primary);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.sidebar__brand-icon svg { width: 18px; height: 18px; stroke: #fff; }
.sidebar__brand-name {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--clr-text-inverse);
  white-space: nowrap;
  overflow: hidden;
}

/* Nav list */
.sidebar__nav {
  flex: 1;
  padding: var(--sp-4) var(--sp-3);
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.sidebar__nav-item { display: flex; }

.sidebar__nav-link {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: 100%;
  padding: var(--sp-3) var(--sp-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--clr-sidebar-text);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  white-space: nowrap;
  overflow: hidden;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.sidebar__nav-link svg {
  width: 18px; height: 18px;
  stroke: currentColor;
  flex-shrink: 0;
}
.sidebar__nav-link:hover {
  background: var(--clr-sidebar-bg-hover);
  color: var(--clr-text-inverse);
}
.sidebar__nav-link.active {
  background: var(--clr-primary);
  color: var(--clr-text-inverse);
}
.sidebar__nav-link-label { overflow: hidden; }

/* Bottom section: user card + logout */
.sidebar__footer {
  padding: var(--sp-4) var(--sp-3);
  border-top: 1px solid var(--clr-sidebar-border);
  flex-shrink: 0;
}
.sidebar__user {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.sidebar__avatar {
  width: 34px; height: 34px;
  border-radius: var(--radius-full);
  background: var(--clr-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  color: #fff;
  flex-shrink: 0;
  text-transform: uppercase;
}
.sidebar__user-info { overflow: hidden; }
.sidebar__user-name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--clr-text-inverse);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar__user-role {
  font-size: var(--text-xs);
  color: var(--clr-sidebar-text);
  text-transform: capitalize;
}

.btn--logout {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  width: 100%;
  margin-top: var(--sp-2);
  padding: var(--sp-2) var(--sp-3);
  background: transparent;
  border: 1px solid var(--clr-sidebar-border);
  border-radius: var(--radius-md);
  color: var(--clr-sidebar-text);
  font-size: var(--text-sm);
  font-family: var(--font-family);
  cursor: pointer;
  text-align: left;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.btn--logout:hover {
  background: var(--clr-danger);
  border-color: var(--clr-danger);
  color: #fff;
}
.btn--logout svg { width: 16px; height: 16px; stroke: currentColor; }

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

/* ── Top header ─────────────────────────────────────────────── */
.top-header {
  height: var(--header-height);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-6);
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  z-index: var(--z-header);
  gap: var(--sp-4);
}
.top-header__left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.top-header__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--clr-text-primary);
  line-height: var(--line-height-tight);
}
.top-header__breadcrumb {
  font-size: var(--text-xs);
  color: var(--clr-text-muted);
}
.top-header__right {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.top-header__icon-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  color: var(--clr-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.top-header__icon-btn:hover { background: var(--clr-surface-2); color: var(--clr-text-primary); }
.top-header__icon-btn svg  { width: 18px; height: 18px; stroke: currentColor; }

/* ── Page content area ──────────────────────────────────────── */
.page-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--sp-6);
}

/* ── Loading state (shown by router while page JS loads) ────── */
.page-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-4);
  height: 60vh;
  color: var(--clr-text-muted);
}
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--clr-border);
  border-top-color: var(--clr-primary);
  border-radius: var(--radius-full);
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Empty / error state ────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--sp-3);
  padding: var(--sp-12);
  text-align: center;
  color: var(--clr-text-muted);
}
.empty-state svg   { width: 48px; height: 48px; stroke: var(--clr-border); }
.empty-state__title { font-size: var(--text-md); font-weight: var(--font-semibold); color: var(--clr-text-secondary); }
.empty-state__desc  { font-size: var(--text-sm); max-width: 320px; }