:root {
    --ag-primary: #1e3a5f;
    --ag-primary-light: #2c5282;
    --ag-accent: #3182ce;
    --ag-sidebar-width: 260px;
    --ag-bg: #f4f6f9;
    --ag-card-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --ag-card-bg: #fff;
    --ag-card-header-bg: #f8fafc;
    --ag-border: #edf2f7;
    --ag-text: #2d3748;
    --ag-muted: #718096;
    --ag-card-shadow-hover: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.1);
}

body {
    background-color: var(--ag-bg);
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

/* Login */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--ag-primary) 0%, var(--ag-primary-light) 100%);
}

.login-card {
    width: 100%;
    max-width: 420px;
    border: none;
    border-radius: 0.75rem;
    box-shadow: 0 1rem 3rem rgba(0, 0, 0, 0.2);
}

.login-brand {
    color: var(--ag-primary);
    font-weight: 700;
    font-size: 1.75rem;
}

/* Admin layout */
.admin-wrapper {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--ag-sidebar-width);
    background: var(--ag-primary);
    color: #fff;
    flex-shrink: 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-brand {
    padding: 1.25rem 1.5rem;
    font-size: 1.35rem;
    font-weight: 700;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-brand i {
    font-size: 1.5rem;
}

.sidebar-nav {
    padding: 1rem 0;
}

.sidebar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    padding: 0.65rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-left: 3px solid transparent;
    transition: all 0.2s;
}

.sidebar-nav .nav-link:hover,
.sidebar-nav .nav-link.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
    border-left-color: var(--ag-accent);
}

.sidebar-nav .nav-link i {
    width: 1.25rem;
    text-align: center;
}

.main-content {
    margin-left: var(--ag-sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    background: var(--ag-card-bg);
    border-bottom: 1px solid var(--ag-border);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.content-area {
    padding: 1.5rem;
    flex: 1;
}

.page-header {
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--ag-text);
    margin: 0;
}

.page-header .breadcrumb {
    margin-bottom: 0;
    font-size: 0.875rem;
}

/* Cards */
.stat-card {
    border: none;
    border-radius: 0.5rem;
    box-shadow: var(--ag-card-shadow);
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
}

.stat-card .card-body {
    padding: 1.25rem;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-label {
    color: var(--ag-muted);
    font-size: 0.875rem;
}

/* Tables */
.table-card {
    border: none;
    border-radius: 0.5rem;
    box-shadow: var(--ag-card-shadow);
}

.table-card .card-header {
    background: #fff;
    border-bottom: 1px solid #edf2f7;
    font-weight: 600;
}

.table thead th {
    background: #f8fafc;
    font-weight: 600;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    color: #4a5568;
    border-bottom-width: 1px;
}

/* Badges */
.badge-available { background-color: #38a169; }
.badge-assigned { background-color: #3182ce; }
.badge-maintenance { background-color: #d69e2e; }
.badge-retired { background-color: #718096; }
.badge-active { background-color: #38a169; }
.badge-returned { background-color: #718096; }

/* Filter bar */
.filter-bar {
    background: var(--ag-card-bg);
    border: 1px solid var(--ag-border);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: var(--ag-card-shadow);
}

/* Chart containers */
.chart-container {
    position: relative;
    height: 280px;
}

@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 999;
    }

    .sidebar-overlay.show {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .content-area {
        padding: 1rem;
    }

    .page-header h1 {
        font-size: 1.25rem;
    }

    .filter-bar .col-md-2,
    .filter-bar .col-md-3,
    .filter-bar .col-md-4,
    .filter-bar .col-md-5,
    .filter-bar .col-md-6,
    .filter-bar .col-md-10 {
        margin-bottom: 0.25rem;
    }
}

/* Enterprise cards & polish */
.enterprise-card {
    background: var(--ag-card-bg);
    border: 1px solid var(--ag-border);
    border-radius: 0.5rem;
    box-shadow: var(--ag-card-shadow);
    transition: box-shadow 0.2s, transform 0.2s;
    overflow: hidden;
}

.enterprise-card:hover {
    box-shadow: var(--ag-card-shadow-hover);
}

.card-header-bar {
    padding: 0.875rem 1.25rem;
    font-weight: 600;
    font-size: 0.9375rem;
    border-bottom: 1px solid var(--ag-border);
    background: var(--ag-card-header-bg);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-footer-bar {
    padding: 0.875rem 1.25rem;
    border-top: 1px solid var(--ag-border);
    background: var(--ag-card-header-bg);
}

.info-field label {
    display: block;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--ag-muted);
    margin-bottom: 0.25rem;
    font-weight: 600;
}

.info-field .info-value {
    font-size: 0.9375rem;
    color: var(--ag-text);
}

.enterprise-tabs .nav-link {
    color: var(--ag-muted);
    font-weight: 500;
    font-size: 0.875rem;
    border: none;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    padding: 0.75rem 1rem;
}

.enterprise-tabs .nav-link.active {
    color: var(--ag-accent);
    border-bottom-color: var(--ag-accent);
    background: transparent;
}

.border-accent { border-left: 4px solid var(--ag-accent) !important; }
.border-accent-success { border-left-color: #38a169 !important; }
.border-accent-warning { border-left-color: #d69e2e !important; }
.border-accent-danger { border-left-color: #e53e3e !important; }
.border-accent-info { border-left-color: #3182ce !important; }

.qr-image {
    width: 160px;
    height: 160px;
    border: 1px solid var(--ag-border);
    border-radius: 0.5rem;
    padding: 0.5rem;
    background: #fff;
}

/* Activity timeline */
.activity-timeline {
    position: relative;
    padding-left: 0.5rem;
}

.timeline-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.25rem;
    position: relative;
}

.timeline-item:not(:last-child)::before {
    content: '';
    position: absolute;
    left: 19px;
    top: 40px;
    bottom: -12px;
    width: 2px;
    background: var(--ag-border);
}

.timeline-marker {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: #fff;
    font-size: 1rem;
    z-index: 1;
}

.timeline-marker.bg-primary { background-color: var(--ag-primary) !important; }
.timeline-marker.bg-info { background-color: #3182ce !important; }
.timeline-marker.bg-warning { background-color: #d69e2e !important; }
.timeline-marker.bg-success { background-color: #38a169 !important; }
.timeline-marker.bg-danger { background-color: #e53e3e !important; }
.timeline-marker.bg-secondary { background-color: #718096 !important; }

.timeline-content {
    flex: 1;
    padding: 0.875rem 1rem;
    min-width: 0;
}

.timeline-title { font-size: 0.9375rem; }
.timeline-desc { font-size: 0.875rem; color: var(--ag-muted); }

.page-loading::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--ag-accent), var(--ag-primary-light));
    z-index: 9999;
    animation: loading-bar 1s ease-in-out infinite;
}

@keyframes loading-bar {
    0% { opacity: 0.4; }
    50% { opacity: 1; }
    100% { opacity: 0.4; }
}

/* Dark mode */
[data-bs-theme="dark"] {
    --ag-bg: #0f1419;
    --ag-primary: #1a365d;
    --ag-primary-light: #2c5282;
    --ag-accent: #4299e1;
    --ag-card-bg: #1a202c;
    --ag-card-header-bg: #171923;
    --ag-border: #2d3748;
    --ag-text: #e2e8f0;
    --ag-muted: #a0aec0;
    --ag-card-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
    --ag-card-shadow-hover: 0 0.25rem 0.75rem rgba(0, 0, 0, 0.4);
}

[data-bs-theme="dark"] body {
    background-color: var(--ag-bg);
    color: var(--ag-text);
}

[data-bs-theme="dark"] .topbar,
[data-bs-theme="dark"] .filter-bar,
[data-bs-theme="dark"] .table-card .card-header {
    background: var(--ag-card-bg);
    border-color: var(--ag-border);
    color: var(--ag-text);
}

[data-bs-theme="dark"] .page-header h1 {
    color: var(--ag-text);
}

[data-bs-theme="dark"] .table thead th {
    background: var(--ag-card-header-bg);
    color: var(--ag-muted);
}

[data-bs-theme="dark"] .stat-label {
    color: var(--ag-muted);
}

[data-bs-theme="dark"] .enterprise-card,
[data-bs-theme="dark"] .stat-card,
[data-bs-theme="dark"] .table-card {
    background: var(--ag-card-bg);
    border-color: var(--ag-border);
}

[data-bs-theme="dark"] .badge.bg-light {
    background-color: #2d3748 !important;
    color: #e2e8f0 !important;
}

[data-bs-theme="dark"] .qr-image {
    background: #fff;
}