:root {
  --primary:     #1E3A5F;
  --primary-light: #2D5186;
  --accent:      #4A90D9;
  --success:     #27AE60;
  --warning:     #F39C12;
  --danger:      #E74C3C;
  --bg:          #F5F8FF;
  --surface:     #FFFFFF;
  --border:      #E8ECF4;
  --text-primary:#1A1A2E;
  --text-secondary:#6B7280;
  --text-muted:  #9CA3AF;
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.10);
  --radius-sm:   8px;
  --radius-md:   12px;
  --radius-lg:   16px;
  --sidebar-w:   240px;
  --topbar-h:    60px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background:   var(--bg);
  color:        var(--text-primary);
  font-size:    14px;
  line-height:  1.6;
}

a { text-decoration: none; color: inherit; }

/* ── Layout ── */
.app-layout {
  display:   flex;
  min-height: 100vh;
}

.sidebar {
  width:      var(--sidebar-w);
  background: var(--primary);
  position:   fixed;
  top:        0;
  left:       0;
  height:     100vh;
  overflow-y: auto;
  z-index:    100;
  display:    flex;
  flex-direction: column;
}

.sidebar-logo {
  padding:     20px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo h1 {
  color:       #fff;
  font-size:   16px;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.sidebar-logo span {
  color:     rgba(255,255,255,0.5);
  font-size: 11px;
}

.sidebar-nav {
  padding: 12px 0;
  flex:    1;
}

.nav-section {
  padding:     8px 16px 4px;
  color:       rgba(255,255,255,0.4);
  font-size:   10px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.nav-item {
  display:     flex;
  align-items: center;
  gap:         10px;
  padding:     10px 20px;
  color:       rgba(255,255,255,0.75);
  cursor:      pointer;
  transition:  all 0.15s;
  border-left: 3px solid transparent;
  font-size:   14px;
}

.nav-item:hover {
  background:  rgba(255,255,255,0.08);
  color:       #fff;
}

.nav-item.active {
  background:  rgba(255,255,255,0.12);
  color:       #fff;
  border-left-color: var(--accent);
}

.nav-group-toggle svg { width: 18px; height: 18px; opacity: 0.8; flex-shrink: 0; }

.nav-item svg {
  width:    18px;
  height:   18px;
  opacity:  0.8;
  flex-shrink: 0;
}

.nav-item.active svg { opacity: 1; }

.sidebar-footer {
  padding:       16px 20px;
  border-top:    1px solid rgba(255,255,255,0.1);
}

.sidebar-user {
  display:     flex;
  align-items: center;
  gap:         10px;
  margin-bottom: 12px;
}

.user-avatar {
  width:          36px;
  height:         36px;
  border-radius:  50%;
  background:     rgba(255,255,255,0.2);
  display:        flex;
  align-items:    center;
  justify-content: center;
  color:          #fff;
  font-weight:    700;
  font-size:      14px;
  flex-shrink:    0;
}

.user-info { flex: 1; overflow: hidden; }

.user-name {
  color:         #fff;
  font-size:     13px;
  font-weight:   600;
  white-space:   nowrap;
  overflow:      hidden;
  text-overflow: ellipsis;
}

.user-role {
  color:     rgba(255,255,255,0.5);
  font-size: 11px;
}

.btn-logout {
  width:         100%;
  padding:       8px;
  background:    rgba(255,255,255,0.1);
  border:        1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius-sm);
  color:         rgba(255,255,255,0.8);
  cursor:        pointer;
  font-size:     13px;
  transition:    all 0.15s;
}

.btn-logout:hover {
  background: rgba(255,255,255,0.18);
  color:      #fff;
}

/* ── Main content ── */
.main-content {
  margin-left: var(--sidebar-w);
  flex:        1;
  min-height:  100vh;
}

.topbar {
  height:      var(--topbar-h);
  background:  var(--surface);
  border-bottom: 1px solid var(--border);
  display:     flex;
  align-items: center;
  padding:     0 24px;
  position:    sticky;
  top:         0;
  z-index:     50;
  gap:         16px;
}

.topbar-title {
  font-size:   18px;
  font-weight: 600;
  color:       var(--primary);
  flex:        1;
}

.page-content {
  padding: 24px;
}

/* ── Cards ── */
.card {
  background:    var(--surface);
  border:        1px solid var(--border);
  border-radius: var(--radius-md);
  padding:       20px;
  box-shadow:    var(--shadow-sm);
}

.card-header {
  display:       flex;
  align-items:   center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.card-title {
  font-size:   15px;
  font-weight: 600;
  color:       var(--primary);
}

/* ── Metric cards ── */
.metrics-grid {
  display:               grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap:                   16px;
  margin-bottom:         24px;
}

.metric-card {
  background:    var(--surface);
  border:        1px solid var(--border);
  border-radius: var(--radius-md);
  padding:       20px;
  display:       flex;
  flex-direction: column;
  gap:           8px;
}

.metric-icon {
  width:          40px;
  height:         40px;
  border-radius:  var(--radius-sm);
  display:        flex;
  align-items:    center;
  justify-content: center;
  font-size:      20px;
}

.metric-value {
  font-size:   28px;
  font-weight: 700;
  color:       var(--primary);
  line-height: 1;
}

.metric-label {
  font-size: 12px;
  color:     var(--text-secondary);
}

/* ── Tables ── */
.table-wrapper {
  overflow-x: auto;
}

table {
  width:           100%;
  border-collapse: collapse;
}

th {
  text-align:    left;
  padding:       10px 14px;
  font-size:     11px;
  font-weight:   600;
  color:         var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--border);
  white-space:   nowrap;
}

td {
  padding:       12px 14px;
  border-bottom: 1px solid var(--border);
  color:         var(--text-primary);
  font-size:     14px;
}

tr:last-child td { border-bottom: none; }

tr:hover td { background: var(--bg); }

/* ── Badges ── */
.badge {
  display:       inline-flex;
  align-items:   center;
  padding:       3px 10px;
  border-radius: 20px;
  font-size:     11px;
  font-weight:   600;
  white-space:   nowrap;
}

.badge-success  { background: #E8F5E9; color: #2E7D32; }
.badge-danger   { background: #FFEBEE; color: #C62828; }
.badge-warning  { background: #FFF8E1; color: #F57F17; }
.badge-info     { background: #E3F2FD; color: #1565C0; }
.badge-gray     { background: #F5F5F5; color: #616161; }
.badge-teal     { background: #E0F2F1; color: #00695C; }
.badge-purple   { background: #F3E5F5; color: #6A1B9A; }
.badge-slate    { background: #EEF2FF; color: #4338CA; }

/* ── Buttons ── */
.btn {
  display:       inline-flex;
  align-items:   center;
  gap:           6px;
  padding:       8px 16px;
  border-radius: var(--radius-sm);
  font-size:     13px;
  font-weight:   500;
  cursor:        pointer;
  border:        none;
  transition:    all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color:      #fff;
}

.btn-primary:hover { background: var(--primary-light); }

.btn-success {
  background: var(--success);
  color:      #fff;
}

.btn-success:hover { opacity: 0.9; }

.btn-danger {
  background: var(--danger);
  color:      #fff;
}

.btn-danger:hover { opacity: 0.9; }

.btn-outline {
  background:  transparent;
  border:      1px solid var(--border);
  color:       var(--text-primary);
}

.btn-outline:hover { background: var(--bg); }

.btn-sm { padding: 5px 12px; font-size: 12px; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }

.form-label {
  display:       block;
  font-size:     13px;
  font-weight:   500;
  color:         var(--text-primary);
  margin-bottom: 6px;
}

.form-control {
  width:         100%;
  padding:       9px 12px;
  border:        1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size:     14px;
  color:         var(--text-primary);
  background:    var(--surface);
  transition:    border-color 0.15s;
  outline:       none;
}

.form-control:focus { border-color: var(--accent); }

/* ── Search bar ── */
.search-bar {
  display:       flex;
  align-items:   center;
  gap:           8px;
  padding:       8px 14px;
  background:    var(--bg);
  border:        1px solid var(--border);
  border-radius: var(--radius-sm);
}

.search-bar input {
  border:     none;
  background: transparent;
  outline:    none;
  font-size:  14px;
  flex:       1;
  color:      var(--text-primary);
}

/* ── Status bar ── */
.status-bar {
  padding:       8px 16px;
  border-radius: var(--radius-sm);
  font-size:     13px;
  margin-bottom: 16px;
  display:       flex;
  align-items:   center;
  gap:           8px;
}

.status-bar.offline {
  background: #FFF8E1;
  color:      #F57F17;
  border:     1px solid #FFE082;
}

.status-bar.error {
  background: #FFEBEE;
  color:      #C62828;
  border:     1px solid #FFCDD2;
}

/* ── Modal ── */
.modal-overlay {
  position:        fixed;
  inset:           0;
  background:      rgba(0,0,0,0.45);
  z-index:         200;
  display:         flex;
  align-items:     center;
  justify-content: center;
  padding:         20px;
}

.modal {
  background:    var(--surface);
  border-radius: var(--radius-lg);
  padding:       28px;
  width:         100%;
  max-width:     480px;
  max-height:    90vh;
  overflow-y:    auto;
  box-shadow:    var(--shadow-md);
}

.modal-header {
  display:       flex;
  align-items:   center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title {
  font-size:   17px;
  font-weight: 600;
  color:       var(--primary);
}

.modal-close {
  background: none;
  border:     none;
  cursor:     pointer;
  color:      var(--text-muted);
  font-size:  20px;
  line-height: 1;
  padding:    4px;
}

.modal-close:hover { color: var(--text-primary); }

.modal-footer {
  display:         flex;
  justify-content: flex-end;
  gap:             10px;
  margin-top:      24px;
}

/* ── Alerts ── */
.alert {
  padding:       12px 16px;
  border-radius: var(--radius-sm);
  font-size:     13px;
  margin-bottom: 16px;
  display:       flex;
  align-items:   center;
  gap:           10px;
}

.alert-danger  { background: #FFEBEE; color: #C62828; border: 1px solid #FFCDD2; }
.alert-success { background: #E8F5E9; color: #2E7D32; border: 1px solid #C8E6C9; }
.alert-warning { background: #FFF8E1; color: #F57F17; border: 1px solid #FFE082; }

/* ── Loading ── */
.spinner {
  width:         24px;
  height:        24px;
  border:        3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation:     spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-center {
  display:         flex;
  flex-direction:  column;
  align-items:     center;
  justify-content: center;
  padding:         60px 20px;
  gap:             16px;
  color:           var(--text-muted);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar       { transform: translateX(-100%); }
  .main-content  { margin-left: 0; }
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }