:root {
    --sentinel-bg: #020617;
    --sentinel-bg-soft: #0f172a;
    --sentinel-surface: rgba(15, 23, 42, 0.72);
    --sentinel-border: rgba(148, 163, 184, 0.16);
    --sentinel-accent: #22d3ee;
    --sentinel-accent-2: #818cf8;
    --sentinel-text: #e2e8f0;
    --sentinel-muted: #94a3b8;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    color: var(--sentinel-text);
    background: radial-gradient(circle at 20% 10%, rgba(34, 211, 238, 0.08), transparent 40%),
                radial-gradient(circle at 80% 20%, rgba(168, 85, 247, 0.08), transparent 40%),
                radial-gradient(circle at 40% 100%, rgba(99, 102, 241, 0.1), transparent 50%),
                var(--sentinel-bg);
    min-height: 100vh;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image: radial-gradient(circle at 1px 1px, rgba(148, 163, 184, 0.12) 1px, transparent 0);
    background-size: 26px 26px;
    opacity: 0.55;
    z-index: -1;
}

.auth-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.auth-card,
.panel-card,
.card {
    border: 1px solid var(--sentinel-border);
    border-radius: 1rem;
    box-shadow: 0 20px 40px rgba(2, 6, 23, 0.45);
    background: var(--sentinel-surface);
    color: var(--sentinel-text);
    backdrop-filter: blur(7px);
}

.stat-card {
    background:
        linear-gradient(140deg, rgba(15, 23, 42, 0.92), rgba(2, 7, 24, 0.95)),
        radial-gradient(circle at 85% 15%, rgba(34, 211, 238, 0.18), transparent 42%);
    border: 1px solid rgba(56, 189, 248, 0.25);
    box-shadow: 0 18px 34px rgba(2, 7, 24, 0.5);
}

.stat-card .card-body {
    position: relative;
}

.stat-card .card-body::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 1rem;
    pointer-events: none;
    border: 1px solid rgba(129, 140, 248, 0.22);
}

.sidebar {
    min-height: 100vh;
    background: rgba(2, 6, 23, 0.82);
    border-right: 1px solid var(--sentinel-border);
    color: var(--sentinel-text);
}

.sidebar .nav-link {
    color: #cbd5e1;
    border: 1px solid transparent;
    border-radius: 0.75rem;
    margin-bottom: 0.35rem;
    padding: 0.6rem 0.75rem;
}

.sidebar .nav-link.active,
.sidebar .nav-link:hover {
    color: #fff;
    border-color: rgba(34, 211, 238, 0.35);
    background: linear-gradient(90deg, rgba(34, 211, 238, 0.18), rgba(129, 140, 248, 0.16));
}

.content-area {
    padding: 1.25rem;
}

.btn-sentinel {
    background: linear-gradient(90deg, var(--sentinel-accent), var(--sentinel-accent-2));
    border-color: transparent;
    color: #fff;
    font-weight: 600;
}

.btn-sentinel:hover,
.btn-sentinel:focus {
    opacity: 0.92;
    color: #fff;
}

.btn-outline-primary {
    background: #2563eb;
    border-color: #2563eb;
    color: #fff;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus {
    background: #1d4ed8;
    border-color: #1d4ed8;
    color: #fff;
}

.btn-outline-secondary {
    background: #475569;
    border-color: #475569;
    color: #fff;
}

.btn-outline-secondary:hover,
.btn-outline-secondary:focus {
    background: #334155;
    border-color: #334155;
    color: #fff;
}

.btn-outline-dark {
    background: #0f172a;
    border-color: #334155;
    color: #fff;
}

.btn-outline-dark:hover,
.btn-outline-dark:focus {
    background: #1e293b;
    border-color: #475569;
    color: #fff;
}

.btn-outline-danger {
    background: #dc3545;
    border-color: #dc3545;
    color: #fff;
}

.btn-outline-danger:hover,
.btn-outline-danger:focus {
    background: #bb2d3b;
    border-color: #bb2d3b;
    color: #fff;
}

.form-control,
.form-select,
.form-control:focus,
.form-select:focus {
    background: rgba(15, 23, 42, 0.74);
    color: var(--sentinel-text);
    border-color: var(--sentinel-border);
    box-shadow: 0 0 0 0.2rem rgba(34, 211, 238, 0.15);
}

.form-control::placeholder {
    color: #64748b;
}

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

.table thead,
.table-light,
table.dataTable > thead > tr > th {
    background: linear-gradient(90deg, rgba(34, 211, 238, 0.18), rgba(99, 102, 241, 0.2));
    color: #ecfeff;
    border-bottom: 1px solid var(--sentinel-border);
    text-transform: uppercase;
    letter-spacing: 0.02em;
    font-size: 0.78rem;
}

table.dataTable thead th,
table.dataTable thead td {
    background: linear-gradient(90deg, rgba(34, 211, 238, 0.18), rgba(99, 102, 241, 0.2)) !important;
    color: #ecfeff !important;
    border-bottom: 1px solid rgba(34, 211, 238, 0.35) !important;
}

.table > :not(caption) > * > * {
    background: #020718;
    color: #fff;
}

table.dataTable tbody tr > * {
    background: #020718 !important;
    color: #fff !important;
}

.table td,
.table th {
    border-color: rgba(148, 163, 184, 0.14);
}

.dataTables_wrapper .dataTables_filter input,
.dataTables_wrapper .dataTables_length select {
    background: rgba(15, 23, 42, 0.74);
    color: var(--sentinel-text);
    border: 1px solid var(--sentinel-border);
    border-radius: 0.5rem;
    padding: 0.35rem 0.6rem;
}

.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_paginate {
    color: var(--sentinel-muted) !important;
}

.page-item .page-link {
    background: rgba(15, 23, 42, 0.74);
    border-color: var(--sentinel-border);
    color: var(--sentinel-text);
}

.page-item.active .page-link {
    border-color: rgba(34, 211, 238, 0.4);
    background: linear-gradient(90deg, rgba(34, 211, 238, 0.28), rgba(129, 140, 248, 0.2));
}

.alert-success,
.alert-warning,
.alert-danger {
    border: 1px solid var(--sentinel-border);
}

.modal-content {
    background: #0f172a;
    color: var(--sentinel-text);
    border: 1px solid var(--sentinel-border);
}

.user-topbar {
    border-bottom: 1px solid rgba(148, 163, 184, 0.16);
    padding-bottom: 0.75rem;
}

.notification-menu {
    min-width: 360px;
    max-width: 420px;
    padding: 0;
    border: 1px solid var(--sentinel-border);
    background: #0b1222;
    color: var(--sentinel-text);
}

.notification-list {
    max-height: 360px;
    overflow-y: auto;
}

.notification-item {
    border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}

.notification-item:last-child {
    border-bottom: 0;
}

.notification-item:not(.is-read) {
    background: rgba(34, 211, 238, 0.08);
}

.notification-menu .btn-link {
    color: var(--sentinel-accent);
    font-size: 0.78rem;
}

.notification-menu .btn-link:hover,
.notification-menu .btn-link:focus {
    color: #67e8f9;
}

.text-muted,
.small {
    color: var(--sentinel-muted) !important;
}

@media (max-width: 992px) {
    .sidebar {
        min-height: auto;
    }
}