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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark: #1f2937;
    --darker: #111827;
    --light: #f3f4f6;
    --lighter: #ffffff;
    --border: #e5e7eb;
    --text-primary: #111827;
    --text-secondary: #6b7280;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light);
    color: var(--text-primary);
}

/* Login Screen */
.login-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
    background: white;
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    max-width: 400px;
}

.login-box .logo {
    text-align: center;
    margin-bottom: 2rem;
}

.login-box .logo h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.login-box .logo p {
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input {
    width: 100%;
    padding: 0.875rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    width: 100%;
}

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.error-message {
    color: var(--danger-color);
    margin-top: 1rem;
    text-align: center;
    display: none;
}

.error-message.show {
    display: block;
}

.success-message {
    color: var(--success-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: #d1fae5;
    border: 1px solid #10b981;
    border-radius: 6px;
    display: none;
    font-weight: 500;
}

.success-message.show {
    display: block !important;
}

.error-message {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: #fee2e2;
    border: 1px solid #ef4444;
    border-radius: 6px;
    display: none;
    font-weight: 500;
}

.error-message.show {
    display: block !important;
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--darker);
    color: white;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar .logo {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar .logo h2 {
    font-size: 1.5rem;
}

.nav-menu {
    flex: 1;
    padding: 1rem 0;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all 0.3s;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.nav-item.active {
    background: var(--primary-color);
    color: white;
    border-left: 4px solid white;
}

.nav-item span {
    font-size: 1.25rem;
    margin-right: 0.75rem;
}

.user-info {
    padding: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.user-details {
    flex: 1;
}

.user-details strong {
    display: block;
    font-size: 0.875rem;
}

.user-details small {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.75rem;
}

.btn-logout {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
}

.btn-logout:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 260px;
    background: var(--light);
}

.header {
    background: white;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-actions span {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.content-area {
    padding: 2rem;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.stat-card {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}

.stat-card.clickable-widget:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.stat-card-icon {
    font-size: 2rem;
}

.stat-card-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-card-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Devices Grid */
.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.device-card {
    background: white;
    padding: 1.2rem; /* ~20% shorter */
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s;
}

.device-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.device-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 0.8rem;
}

.device-name {
    font-size: 1rem;
    font-weight: 600;
}

.device-status {
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-active {
    background: #d1fae5;
    color: #065f46;
}

.status-inactive {
    background: #fee2e2;
    color: #991b1b;
}

.status-offline {
    background: #fef3c7;
    color: #92400e;
}

.device-info {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.device-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.4rem;
    margin-top: 0.8rem;
    padding-top: 0.8rem;
    border-top: 1px solid var(--border);
}

.metric {
    display: flex;
    flex-direction: column;
}

.metric-label {
    font-size: 0.8rem; /* match metric-value size */
    color: var(--text-secondary);
    margin-bottom: 0.15rem;
}

.metric-value {
    font-size: 0.8rem;
    font-weight: 600;
}

/* Table */
.table-container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

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

thead {
    background: var(--light);
}

th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

td {
    padding: 1rem;
    border-top: 1px solid var(--border);
}

tr:hover {
    background: var(--light);
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

/* Form Styles */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.875rem;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-group input[type="number"] {
  -moz-appearance: textfield;
}

.form-group input[type="number"]::-webkit-outer-spin-button,
.form-group input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    width: 70px;
  }

  .sidebar .logo h2,
  .sidebar .nav-item span ~ *,
  .user-info {
    display: none;
  }

  .main-content {
    margin-left: 70px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .devices-grid {
    grid-template-columns: 1fr;
  }
  
  #mapContainer {
    height: 400px !important;
  }
}

/* Map Styles */
.custom-marker {
    background: transparent !important;
    border: none !important;
}

.custom-popup .leaflet-popup-content-wrapper {
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    padding: 0;
    overflow: hidden;
}

.custom-popup .leaflet-popup-content {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.custom-popup .leaflet-popup-tip {
    background: white;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Marker Cluster Styles */
.marker-cluster-small {
    background-color: rgba(59, 130, 246, 0.6);
    border: 3px solid white;
    border-radius: 50%;
    color: white;
    font-weight: bold;
    text-align: center;
    font-size: 12px;
    line-height: 20px;
}

.marker-cluster-medium {
    background-color: rgba(16, 185, 129, 0.6);
    border: 3px solid white;
    border-radius: 50%;
    color: white;
    font-weight: bold;
    text-align: center;
    font-size: 14px;
    line-height: 24px;
}

.marker-cluster-large {
    background-color: rgba(245, 158, 11, 0.6);
    border: 3px solid white;
    border-radius: 50%;
    color: white;
    font-weight: bold;
    text-align: center;
    font-size: 16px;
    line-height: 28px;
}

/* Map Container */
#map {
    border-radius: 8px;
}

/* Real-time Data Notifications */
.data-notification {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--success-color);
    color: white;
    padding: 12px 16px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    animation: slideInRight 0.3s ease-out;
    max-width: 300px;
}

.notification-content {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.device-id {
    font-weight: 600;
    font-size: 14px;
}

.data-info {
    font-size: 12px;
    opacity: 0.9;
}

.timestamp {
    font-size: 11px;
    opacity: 0.8;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Transformer Make Dropdown Styling */
select[name="transformerMake"] {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    background-color: white;
    font-size: 0.875rem;
    padding: 0.5rem;
    width: 100%;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

select[name="transformerMake"]:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

select[name="transformerMake"] option {
    padding: 0.5rem;
    font-size: 0.875rem;
}

select[name="transformerMake"] option:hover {
    background-color: #f3f4f6;
}

/* Custom scrollbar for the dropdown */
select[name="transformerMake"]::-webkit-scrollbar {
    width: 8px;
}

select[name="transformerMake"]::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 4px;
}

select[name="transformerMake"]::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

select[name="transformerMake"]::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}