/* App Layout */
.app-layout { display: flex; min-height: 100vh; }
.app-sidebar { width: var(--sidebar-width); background: var(--bg-sidebar); border-right: 1px solid var(--border-color); position: fixed; top: 0; left: 0; bottom: 0; z-index: var(--z-sidebar); display: flex; flex-direction: column; transition: width var(--t-normal); overflow: hidden; }
.app-sidebar.collapsed { width: var(--sidebar-collapsed); }
.app-main { flex: 1; margin-left: var(--sidebar-width); display: flex; flex-direction: column; min-height: 100vh; transition: margin-left var(--t-normal); overflow-x: hidden; max-width: calc(100vw - var(--sidebar-width)); }
.app-sidebar.collapsed + .app-main { margin-left: var(--sidebar-collapsed); max-width: calc(100vw - var(--sidebar-collapsed)); }
.app-topbar { height: var(--topbar-height); background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); display: flex; align-items: center; padding: 0 var(--sp-6); position: sticky; top: 0; z-index: var(--z-topbar); gap: var(--sp-4); }

/* Login page: hide sidebar/topbar via body class */
body.login-active .app-sidebar { display: none; }
body.login-active .app-topbar { display: none; }
body.login-active .app-main { margin-left: 0; max-width: 100%; min-height: 100vh; }
body.login-active .fb-fab { display: none; }
.app-content { flex: 1; padding: var(--sp-6); max-width: var(--content-max-width); width: 100%; margin: 0 auto; overflow-x: hidden; box-sizing: border-box; }

/* Page header */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--sp-6); flex-wrap: wrap; gap: var(--sp-4); }
.page-header h1 { font-size: var(--fs-2xl); font-weight: var(--fw-bold); }
.page-header h2 { font-size: var(--fs-xl); font-weight: var(--fw-semibold); }
.page-actions { display: flex; gap: var(--sp-3); align-items: center; }

/* Grid system */
.grid { display: grid; gap: var(--sp-4); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--sp-1); }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }
.gap-6 { gap: var(--sp-6); }
.gap-8 { gap: var(--sp-8); }
.flex-1 { flex: 1; }

/* Spacing utilities */
.mt-2 { margin-top: var(--sp-2); }
.mt-4 { margin-top: var(--sp-4); }
.mt-6 { margin-top: var(--sp-6); }
.mb-2 { margin-bottom: var(--sp-2); }
.mb-4 { margin-bottom: var(--sp-4); }
.mb-6 { margin-bottom: var(--sp-6); }
.p-4 { padding: var(--sp-4); }
.p-6 { padding: var(--sp-6); }
.px-4 { padding-left: var(--sp-4); padding-right: var(--sp-4); }
.py-2 { padding-top: var(--sp-2); padding-bottom: var(--sp-2); }

/* Text utilities */
.text-sm { font-size: var(--fs-sm); }
.text-xs { font-size: var(--fs-xs); }
.text-lg { font-size: var(--fs-lg); }
.text-xl { font-size: var(--fs-xl); }
.text-2xl { font-size: var(--fs-2xl); }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary { color: var(--color-primary) !important; }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.font-medium { font-weight: var(--fw-medium); }
.font-semibold { font-weight: var(--fw-semibold); }
.font-bold { font-weight: var(--fw-bold); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* Width utilities */
.w-full { width: 100%; }
.max-w-sm { max-width: 400px; }
.max-w-md { max-width: 600px; }
.max-w-lg { max-width: 800px; }

/* Responsive */
@media (max-width: 1024px) {
    .grid-5 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .app-sidebar { transform: translateX(-100%); width: var(--sidebar-width); }
    .app-sidebar.open { transform: translateX(0); }
    .app-main { margin-left: 0 !important; max-width: 100% !important; }
    .app-content { padding: var(--sp-4); }
    .hide-mobile { display: none !important; }
}

@media (max-width: 640px) {
    .grid-2, .grid-3, .grid-5 { grid-template-columns: 1fr; }
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .page-header { flex-direction: column; align-items: flex-start; }
    .page-actions { width: 100%; }
}