* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --blue: #0EA5E9; --blue-light: #E0F2FE;
  --green: #22C55E; --green-light: #DCFCE7;
  --red: #EF4444;   --red-light: #FEE2E2;
  --orange: #F59E0B; --orange-light: #FEF3C7;
  --gray-50: #F8FAFC; --gray-100: #F1F5F9; --gray-200: #E2E8F0;
  --gray-300: #CBD5E1; --gray-400: #94A3B8; --gray-500: #64748B;
  --gray-600: #475569; --gray-700: #334155; --gray-800: #1E293B;
  --gray-900: #0F172A;
  --sidebar-w: 240px; --topbar-h: 64px;
}

body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--gray-50); color: var(--gray-800); line-height: 1.5; }
.app { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar { width: var(--sidebar-w); background: var(--gray-900); color: #fff; display: flex; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0; z-index: 100; }
.sidebar-header { padding: 20px; border-bottom: 1px solid var(--gray-700); }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 700; }
.nav-menu { list-style: none; padding: 12px 0; flex: 1; }
.nav-item { display: flex; align-items: center; gap: 12px; padding: 12px 20px; cursor: pointer; color: var(--gray-400); transition: all 0.2s; font-size: 14px; }
.nav-item:hover { color: #fff; background: var(--gray-800); }
.nav-item.active { color: var(--blue); background: rgba(14,165,233,0.1); border-right: 3px solid var(--blue); }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid var(--gray-700); }
.system-status { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--gray-400); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; }
.status-dot.online { background: var(--green); }
.status-dot.offline { background: var(--red); }
.status-dot.warning { background: var(--orange); }

/* Main */
.main-content { flex: 1; margin-left: var(--sidebar-w); min-height: 100vh; }
.top-bar { height: var(--topbar-h); background: #fff; border-bottom: 1px solid var(--gray-200); display: flex; align-items: center; justify-content: space-between; padding: 0 24px; position: sticky; top: 0; z-index: 50; }
.top-bar h1 { font-size: 20px; font-weight: 600; }
.top-bar-actions { display: flex; align-items: center; gap: 16px; }
.notification-bell { position: relative; cursor: pointer; padding: 8px; }
.badge { position: absolute; top: 2px; right: 2px; background: var(--red); color: #fff; font-size: 10px; min-width: 16px; height: 16px; border-radius: 8px; display: flex; align-items: center; justify-content: center; }
.datetime { font-size: 13px; color: var(--gray-500); }
.page-content { padding: 24px; }
.page { display: none; }
.page.active { display: block; }

/* KPI */
.kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }
.kpi-card { background: #fff; border-radius: 12px; padding: 20px; display: flex; align-items: center; gap: 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.kpi-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; }
.kpi-icon.blue { background: var(--blue-light); color: var(--blue); }
.kpi-icon.green { background: var(--green-light); color: var(--green); }
.kpi-icon.red { background: var(--red-light); color: var(--red); }
.kpi-icon.orange { background: var(--orange-light); color: var(--orange); }
.kpi-info { display: flex; flex-direction: column; }
.kpi-label { font-size: 13px; color: var(--gray-500); }
.kpi-value { font-size: 24px; font-weight: 700; }

/* Sections */
.section { background: #fff; border-radius: 12px; padding: 20px; margin-bottom: 16px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.section-header .section-title { margin-bottom: 0; }
.section-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; }

/* Floor Grid */
.floor-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.floor-card { background: var(--gray-50); border-radius: 8px; padding: 16px; text-align: center; border: 1px solid var(--gray-200); }
.floor-card .floor-name { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.floor-card .floor-status { font-size: 12px; padding: 4px 8px; border-radius: 4px; display: inline-block; margin-bottom: 8px; }
.floor-card .floor-status.normal { background: var(--green-light); color: var(--green); }
.floor-card .floor-status.warning { background: var(--orange-light); color: var(--orange); }
.floor-card .floor-status.error { background: var(--red-light); color: var(--red); }
.floor-devices { font-size: 12px; color: var(--gray-500); }

/* Two Col */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* Notifications */
.notification-list { max-height: 300px; overflow-y: auto; }
.notification-item { padding: 12px 0; border-bottom: 1px solid var(--gray-100); display: flex; gap: 12px; align-items: flex-start; }
.notification-item:last-child { border-bottom: none; }
.notification-dot { width: 8px; height: 8px; border-radius: 50%; margin-top: 6px; flex-shrink: 0; }
.notification-dot.alert { background: var(--red); }
.notification-dot.info { background: var(--blue); }
.notification-dot.success { background: var(--green); }
.notification-text { font-size: 13px; color: var(--gray-600); }
.notification-time { font-size: 11px; color: var(--gray-400); margin-top: 4px; }

/* Quick Actions */
.quick-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.action-btn { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: 8px; padding: 16px; cursor: pointer; display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--gray-700); transition: all 0.2s; }
.action-btn:hover { background: var(--blue-light); border-color: var(--blue); color: var(--blue); }

/* Buttons */
.btn-primary { background: var(--blue); color: #fff; border: none; border-radius: 6px; padding: 8px 16px; font-size: 13px; cursor: pointer; transition: opacity 0.2s; }
.btn-primary:hover { opacity: 0.9; }
.btn-sm { padding: 4px 12px; font-size: 12px; border-radius: 4px; border: 1px solid var(--gray-200); background: #fff; cursor: pointer; transition: all 0.2s; }
.btn-sm:hover { background: var(--gray-50); }
.btn-sm.danger { color: var(--red); border-color: var(--red); }
.btn-sm.danger:hover { background: var(--red-light); }

/* Tables */
.table-container { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th { background: var(--gray-50); padding: 10px 12px; text-align: left; font-weight: 600; color: var(--gray-600); border-bottom: 1px solid var(--gray-200); }
.data-table td { padding: 10px 12px; border-bottom: 1px solid var(--gray-100); color: var(--gray-700); }
.data-table tr:hover td { background: var(--gray-50); }

/* Status badges */
.status-badge { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 12px; font-weight: 500; }
.status-badge.online, .status-badge.active { background: var(--green-light); color: var(--green); }
.status-badge.offline { background: var(--gray-200); color: var(--gray-500); }
.status-badge.warning { background: var(--orange-light); color: var(--orange); }
.status-badge.critical { background: var(--red-light); color: var(--red); }
.status-badge.pending { background: var(--orange-light); color: var(--orange); }
.status-badge.in_progress { background: var(--blue-light); color: var(--blue); }
.status-badge.completed { background: var(--green-light); color: var(--green); }
.status-badge.expired { background: var(--red-light); color: var(--red); }

/* Charts */
.chart-container { position: relative; height: 300px; }
.chart-container.small { height: 250px; }
.chart-controls { display: flex; gap: 8px; align-items: center; }
.chart-controls select, .chart-controls input { padding: 6px 10px; border: 1px solid var(--gray-200); border-radius: 6px; font-size: 13px; background: #fff; }

/* Report */
.report-controls { display: flex; gap: 16px; align-items: flex-end; flex-wrap: wrap; }
.form-group { display: flex; flex-direction: column; gap: 4px; }
.form-group label { font-size: 12px; color: var(--gray-500); font-weight: 500; }
.form-group input, .form-group select { padding: 8px 12px; border: 1px solid var(--gray-200); border-radius: 6px; font-size: 13px; }
.summary-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.summary-card { background: var(--gray-50); border-radius: 8px; padding: 16px; text-align: center; }
.summary-card .summary-label { font-size: 12px; color: var(--gray-500); margin-bottom: 4px; }
.summary-card .summary-value { font-size: 22px; font-weight: 700; }

/* Modal */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 200; align-items: center; justify-content: center; }
.modal-overlay.active { display: flex; }
.modal { background: #fff; border-radius: 12px; width: 480px; max-width: 90vw; max-height: 80vh; overflow-y: auto; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--gray-200); }
.modal-header h3 { font-size: 16px; font-weight: 600; }
.modal-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--gray-400); }
.modal-body { padding: 20px; }
.modal-form-group { margin-bottom: 16px; }
.modal-form-group label { display: block; font-size: 13px; font-weight: 500; color: var(--gray-600); margin-bottom: 6px; }
.modal-form-group input, .modal-form-group select, .modal-form-group textarea { width: 100%; padding: 8px 12px; border: 1px solid var(--gray-200); border-radius: 6px; font-size: 13px; }
.modal-form-group textarea { min-height: 80px; resize: vertical; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 20px; }
.rating { color: var(--orange); }

/* Login Page */
.login-body { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%); }
.login-card { background: #fff; border-radius: 16px; padding: 40px; width: 400px; max-width: 90vw; box-shadow: 0 20px 60px rgba(0,0,0,0.3); }
.login-logo { text-align: center; margin-bottom: 32px; }
.login-logo h1 { font-size: 24px; font-weight: 700; margin-top: 12px; color: var(--gray-900); }
.login-logo p { font-size: 14px; color: var(--gray-500); margin-top: 4px; }
.login-field { margin-bottom: 20px; }
.login-field label { display: block; font-size: 13px; font-weight: 500; color: var(--gray-600); margin-bottom: 6px; }
.login-field input { width: 100%; padding: 10px 14px; border: 1px solid var(--gray-200); border-radius: 8px; font-size: 14px; transition: border-color 0.2s; }
.login-field input:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px rgba(14,165,233,0.1); }
.login-error { color: var(--red); font-size: 13px; min-height: 20px; margin-bottom: 8px; }
.login-btn { width: 100%; padding: 12px; background: var(--blue); color: #fff; border: none; border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer; transition: opacity 0.2s; }
.login-btn:hover { opacity: 0.9; }

/* Hotel Selector */
.hotel-select { padding: 6px 12px; border: 1px solid var(--gray-200); border-radius: 6px; font-size: 13px; background: #fff; cursor: pointer; min-width: 160px; }
.hotel-select:disabled { background: var(--gray-100); cursor: default; }

/* User Info in sidebar */
.sidebar-user { padding: 12px 20px; border-top: 1px solid var(--gray-700); display: flex; align-items: center; gap: 10px; color: var(--gray-400); font-size: 13px; }
.sidebar-user .user-name { color: #fff; font-weight: 500; }
.sidebar-user .user-role { font-size: 11px; background: var(--gray-700); padding: 2px 6px; border-radius: 3px; }
.sidebar-logout { margin-left: auto; background: none; border: none; color: var(--gray-400); cursor: pointer; font-size: 16px; }
.sidebar-logout:hover { color: var(--red); }

@media (max-width: 1024px) {
  .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .floor-grid { grid-template-columns: repeat(3, 1fr); }
  .two-col { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-content { margin-left: 0; }
  .kpi-grid { grid-template-columns: 1fr; }
  .floor-grid { grid-template-columns: repeat(2, 1fr); }
}