/* Edge Device Monitoring — Admin Dashboard */

:root {
    --bg: #f4f6fa;
    --surface: #ffffff;
    --surface-alt: #f9fafc;
    --border: #e3e7ee;
    --text: #1f2937;
    --text-muted: #6b7280;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #6366f1;
    --sidebar-bg: #111827;
    --sidebar-text: #cbd5e1;
    --sidebar-hover: #1f2937;
    --sidebar-active: #3b82f6;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
    line-height: 1.5;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

button {
    font-family: inherit;
    cursor: pointer;
}

/* ---------- Login ---------- */

.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    padding: 24px;
}

.login-card {
    background: var(--surface);
    padding: 40px 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 400px;
}

.login-card h1 {
    margin: 0 0 4px;
    font-size: 22px;
    font-weight: 600;
}

.login-card .subtitle {
    color: var(--text-muted);
    margin-bottom: 28px;
    font-size: 13px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    font-size: 13px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    background: var(--surface);
    color: var(--text);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-error {
    background: #fef2f2;
    color: var(--danger);
    border: 1px solid #fecaca;
    padding: 10px 12px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 13px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 16px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
    background: var(--surface-alt);
}

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

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

.btn-danger {
    color: var(--danger);
    border-color: #fecaca;
}

.btn-danger:hover {
    background: #fef2f2;
}

.btn-block {
    width: 100%;
}

/* ---------- App shell ---------- */

.app {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-brand {
    padding: 22px 20px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    border-bottom: 1px solid #1f2937;
    letter-spacing: 0.3px;
}

.sidebar-brand .brand-sub {
    display: block;
    font-size: 11px;
    font-weight: 400;
    color: #94a3b8;
    margin-top: 2px;
    letter-spacing: 0;
}

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

.sidebar-nav a {
    display: block;
    padding: 10px 20px;
    color: var(--sidebar-text);
    font-size: 13px;
    border-left: 3px solid transparent;
    transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.sidebar-nav a:hover {
    background: var(--sidebar-hover);
    color: #fff;
    text-decoration: none;
}

.sidebar-nav a.active {
    background: var(--sidebar-hover);
    color: #fff;
    border-left-color: var(--sidebar-active);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid #1f2937;
    font-size: 12px;
}

.sidebar-footer .user-name {
    color: #fff;
    margin-bottom: 8px;
}

.sidebar-footer button {
    background: transparent;
    border: 1px solid #334155;
    color: var(--sidebar-text);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 12px;
    width: 100%;
}

.sidebar-footer button:hover {
    background: var(--sidebar-hover);
    color: #fff;
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    background: var(--surface);
    padding: 16px 28px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.content {
    flex: 1;
    padding: 24px 28px;
}

/* ---------- Cards & stats ---------- */

.card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.card-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h3 {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
}

.card-body {
    padding: 18px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--surface);
    padding: 18px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.stat-card .label {
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 6px;
}

.stat-card .value {
    font-size: 28px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.1;
}

.stat-card.success .value {
    color: var(--success);
}

.stat-card.danger .value {
    color: var(--danger);
}

.stat-card.warning .value {
    color: var(--warning);
}

/* ---------- Tables ---------- */

.table-wrapper {
    overflow-x: auto;
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

table.data-table th,
table.data-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

table.data-table th {
    background: var(--surface-alt);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.4px;
}

table.data-table tbody tr {
    transition: background 0.1s;
}

table.data-table tbody tr:hover {
    background: var(--surface-alt);
}

table.data-table tbody tr.clickable {
    cursor: pointer;
}

table.data-table .muted {
    color: var(--text-muted);
}

/* ---------- Badges ---------- */

.badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-info {
    background: #dbeafe;
    color: #1e40af;
}

.badge-muted {
    background: #e5e7eb;
    color: #374151;
}

/* ---------- Filters ---------- */

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    align-items: flex-end;
}

.filters .form-group {
    margin-bottom: 0;
    min-width: 160px;
}

/* ---------- Charts ---------- */

.chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.chart-card {
    background: var(--surface);
    padding: 18px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.chart-card h3 {
    margin: 0 0 14px;
    font-size: 14px;
    font-weight: 600;
}

.chart-card canvas {
    max-height: 240px;
}

/* ---------- States ---------- */

.loading,
.empty,
.error {
    padding: 32px 16px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.error {
    color: var(--danger);
}

/* ---------- Device detail ---------- */

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.detail-grid .info-item {
    background: var(--surface);
    padding: 14px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.detail-grid .info-item .label {
    color: var(--text-muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    margin-bottom: 4px;
}

.detail-grid .info-item .value {
    font-size: 14px;
    font-weight: 500;
}

.section {
    margin-bottom: 28px;
}

.section h3 {
    margin: 0 0 12px;
    font-size: 15px;
    font-weight: 600;
}

.log-message {
    font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    font-size: 12px;
    color: var(--text);
}

/* ---------- Pagination ---------- */

.pagination {
    display: flex;
    gap: 6px;
    margin-top: 16px;
    justify-content: flex-end;
}

.pagination button {
    padding: 6px 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 12px;
}

.pagination button:hover:not(:disabled) {
    background: var(--surface-alt);
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination .info {
    font-size: 12px;
    color: var(--text-muted);
    align-self: center;
    margin: 0 4px;
}