:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --danger-dark: #b91c1c;
    --success: #16a34a;
    --warning: #ca8a04;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-700: #374151;
    --gray-900: #111827;
    --radius: 6px;
    --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-900);
    line-height: 1.5;
}

.container {
    margin: 0 auto;
    padding: 1.5rem;
}

.admin-container {
    margin-top: 4rem;
}

/* Navbar */
.navbar {
    background: var(--gray-900);
    color: white;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 3.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-navbar {
    background: #1e3a5f;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 101;
}

.navbar-brand a {
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.25rem;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.navbar-menu a {
    color: var(--gray-300);
    text-decoration: none;
    font-size: 0.875rem;
}

.navbar-menu a:hover {
    color: white;
}

.navbar-user {
    color: var(--gray-300);
    font-size: 0.875rem;
    padding: 0 0.5rem;
}

.btn-logout {
    background: var(--danger);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius);
    color: white !important;
}

.btn-logout:hover {
    background: var(--danger-dark);
}

/* Login page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
}

.login-container {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
}

.login-container h1 {
    text-align: center;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.login-subtitle {
    text-align: center;
    color: var(--gray-500);
    margin-bottom: 1.5rem;
}

.login-form .form-group {
    margin-bottom: 1rem;
}

.login-footer {
    text-align: center;
    margin-top: 1rem;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    text-decoration: none;
    background: var(--gray-200);
    color: var(--gray-700);
}

.btn:hover {
    background: var(--gray-300);
}

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

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

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

.btn-danger:hover {
    background: var(--danger-dark);
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Forms */
.form {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.375rem;
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    font-size: 0.875rem;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-group input {
    width: auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* Tables */
.table {
    width: 100%;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
    font-size: 0.875rem;
}

.table th {
    background: var(--gray-100);
    font-weight: 600;
}

.table tbody tr:hover {
    background: var(--gray-50);
}

.text-center {
    text-align: center;
}

/* Page header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.5rem;
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.alert-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-active {
    background: #dcfce7;
    color: var(--success);
}

.badge-inactive {
    background: var(--gray-200);
    color: var(--gray-500);
}

.badge-maintenance {
    background: #fef9c3;
    color: var(--warning);
}

.badge-admin {
    background: #dbeafe;
    color: var(--primary);
}

.badge-user {
	background: var(--gray-200);
	color: var(--gray-700);
}

.badge-processing {
    background: #ffc107;
    color: #333;
}

.badge-completed {
    background: #28a745;
    color: #fff;
}

.badge-failed {
    background: #dc3545;
    color: #fff;
}

.badge-none {
    background: #6c757d;
    color: #fff;
}

.btn-coverage {
    font-size: 0.8rem;
    padding: 2px 8px;
}

/* Dashboard */
.dashboard h1 {
    margin-bottom: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: white;
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

.stat-active .stat-value { color: var(--success); }
.stat-inactive .stat-value { color: var(--gray-500); }
.stat-maintenance .stat-value { color: var(--warning); }

/* Map */
.map-container {
    background: white;
    padding: 1rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

#map {
    height: 50vh;
    border-radius: var(--radius);
}

/* Transmitter summary */
.tx-summary {
    background: white;
    padding: 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

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

.summary-header h2 {
    font-size: 1.25rem;
}

/* Responsive */
@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .navbar-menu {
        gap: 0.5rem;
    }
    
    .table {
        display: block;
        overflow-x: auto;
    }
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-500);
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 2.5rem;
    font-size: 0.75rem;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-right img {
    height: 20px;
    width: auto;
    display: block;
}

body {
    padding-bottom: 2.5rem;
}