:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --sidebar-width: 260px;
    --navbar-height: 64px;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--gray-50); color: var(--gray-800); line-height: 1.5; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

.sidebar { position: fixed; left: 0; top: 0; width: var(--sidebar-width); height: 100vh; background: var(--gray-900); color: #fff; overflow-y: auto; z-index: 1000; transition: transform 0.3s; }
.sidebar-brand { padding: 20px; border-bottom: 1px solid var(--gray-700); }
.sidebar-brand h1 { font-size: 1.2rem; font-weight: 700; color: #fff; }
.sidebar-brand span { font-size: 0.7rem; color: var(--gray-400); }
.sidebar-nav { padding: 12px 0; }
.sidebar-section { padding: 12px 20px 6px; font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--gray-500); font-weight: 600; }
.sidebar-link { display: flex; align-items: center; gap: 12px; padding: 10px 20px; color: var(--gray-300); font-size: 0.9rem; border-left: 3px solid transparent; transition: all 0.2s; }
.sidebar-link:hover { background: var(--gray-800); color: #fff; }
.sidebar-link.active { background: var(--gray-800); color: #fff; border-left-color: var(--primary); }
.sidebar-link i { width: 20px; text-align: center; }

.main-content { margin-left: var(--sidebar-width); min-height: 100vh; }
.navbar { background: #fff; height: var(--navbar-height); padding: 0 24px; display: flex; align-items: center; justify-content: space-between; box-shadow: var(--shadow); position: sticky; top: 0; z-index: 100; }
.navbar-left { display: flex; align-items: center; gap: 16px; }
.navbar-left h2 { font-size: 1.1rem; font-weight: 600; }
.navbar-right { display: flex; align-items: center; gap: 16px; }
.navbar-icon { position: relative; width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border-radius: 50%; cursor: pointer; }
.navbar-icon:hover { background: var(--gray-100); }
.navbar-icon .badge { position: absolute; top: 2px; right: 2px; width: 16px; height: 16px; background: var(--danger); color: #fff; font-size: 0.6rem; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.user-profile { display: flex; align-items: center; gap: 10px; cursor: pointer; padding: 6px 12px; border-radius: var(--radius); }
.user-profile:hover { background: var(--gray-100); }
.user-avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-weight: 600; font-size: 0.85rem; }
.user-info .name { font-weight: 600; font-size: 0.85rem; }
.user-info .role { font-size: 0.7rem; color: var(--gray-500); }

/* ---------- Navbar dropdowns (notification + user menu) ---------- */
.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: calc(100% + 10px); right: 0; min-width: 280px; background: #fff; border-radius: var(--radius); box-shadow: 0 4px 12px rgba(0,0,0,0.15); border: 1px solid var(--gray-200); padding: 12px 0; opacity: 0; visibility: hidden; transform: translateY(-6px); transition: opacity 0.18s, visibility 0.18s, transform 0.18s; z-index: 1200; }
.dropdown.open .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(0); }

.dropdown-user { display: flex; align-items: center; gap: 10px; padding: 10px 16px; }
.dropdown-user .name { font-weight: 600; font-size: 0.9rem; }
.dropdown-user .role { font-size: 0.75rem; color: var(--gray-500); }
.dropdown-header { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; border-bottom: 1px solid var(--gray-200); }
.dropdown-title { font-weight: 600; font-size: 0.9rem; }
.dropdown-footer { display: block; text-align: center; padding: 10px 16px; border-top: 1px solid var(--gray-200); font-size: 0.82rem; color: var(--primary); }
.dropdown-divider { border-top: 1px solid var(--gray-200); margin: 8px 0; }
.dropdown-item { display: flex; align-items: center; gap: 12px; padding: 10px 16px; font-size: 0.88rem; color: var(--gray-700); }
.dropdown-item i { width: 18px; text-align: center; }
.dropdown-item:hover { background: var(--gray-100); color: var(--gray-800); }
.dropdown-item.text-danger { color: var(--danger); }
.dropdown-item.text-danger:hover { background: #fee2e2; color: var(--danger); }
.dropdown-placeholder { padding: 16px; font-size: 0.85rem; color: var(--gray-500); }
.btn-link { background: none; border: none; cursor: pointer; color: var(--primary); font-size: 0.78rem; padding: 0; }
.btn-link:hover { color: var(--primary-dark); text-decoration: underline; }

/* Notification panel */
.notification-panel { min-width: 320px; max-width: 360px; }
.notification-list { max-height: 320px; overflow-y: auto; }
.notification-item { display: flex; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--gray-200); cursor: pointer; }
.notification-item:hover { background: var(--gray-50); }
.notification-item.unread { background: var(--gray-100); }
.notification-item.unread::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); flex-shrink: 0; align-self: flex-start; }
.notification-item h4 { font-size: 0.85rem; font-weight: 600; margin: 0; color: var(--gray-700); }
.notification-item p { font-size: 0.8rem; color: var(--gray-500); margin: 2px 0 0; }
.notification-item .notif-time { font-size: 0.72rem; color: var(--gray-400); }
.notification-item .notif-icon-s { color: var(--warning); flex-shrink: 0; width: 16px; text-align: center; }
.notification-empty { padding: 24px; text-align: center; font-size: 0.85rem; color: var(--gray-500); }

/* Logout button */
.logout-btn { display: inline-flex; align-items: center; gap: 8px; }
.logout-btn i { font-size: 0.9rem; }
.logout-btn:hover { background: #fee2e2; border-color: var(--danger); color: var(--danger); }
@media (max-width: 767px) {
    .logout-text { display: none; }
    .logout-btn { width: 36px; height: 36px; padding: 0; justify-content: center; border-radius: 50%; }
}

.page-content { padding: 24px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; margin-bottom: 20px; font-size: 0.85rem; color: var(--gray-500); }
.breadcrumb a { color: var(--gray-500); }
.breadcrumb span { color: var(--gray-800); }

.card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-bottom: 20px; }
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--gray-200); }
.card-title { font-size: 1rem; font-weight: 600; }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.kpi-card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.kpi-icon { width: 44px; height: 44px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; margin-bottom: 12px; }
.kpi-label { font-size: 0.75rem; color: var(--gray-500); text-transform: uppercase; font-weight: 500; }
.kpi-value { font-size: 1.6rem; font-weight: 700; margin: 4px 0; }
.kpi-change { font-size: 0.8rem; font-weight: 500; }
.kpi-change.up { color: var(--success); }
.kpi-change.down { color: var(--danger); }