:root {
    --bg: #0f1419;
    --surface: #1a2332;
    --surface-2: #243044;
    --border: #2f3f57;
    --text: #e8edf5;
    --muted: #9aa8bc;
    --accent: #4f8cff;
    --accent-hover: #6ba0ff;
    --success: #3ecf8e;
    --danger: #ff6b6b;
    --radius: 12px;
    --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

.admin-shell {
    display: grid;
    grid-template-columns: 260px 1fr;
    min-height: 100vh;
}

.admin-nav {
    background: linear-gradient(180deg, #121a26 0%, #0f1419 100%);
    border-left: 1px solid var(--border);
    padding: 1.5rem 1rem;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    margin-bottom: 1.5rem;
}

.brand-icon {
    font-size: 1.75rem;
}

.brand strong {
    display: block;
}

.brand small {
    color: var(--muted);
}

.admin-nav nav {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.admin-nav a {
    color: var(--text);
    padding: 0.75rem 1rem;
    border-radius: 10px;
    transition: background 0.15s ease;
}

.admin-nav a:hover,
.admin-nav a.active {
    background: var(--surface-2);
    color: #fff;
}

.admin-content {
    padding: 2rem;
}

.page-header h1 {
    margin: 0 0 0.25rem;
    font-size: 1.75rem;
}

.page-header p {
    margin: 0 0 1.5rem;
    color: var(--muted);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    box-shadow: var(--shadow);
}

.stat-label {
    display: block;
    color: var(--muted);
    font-size: 0.9rem;
}

.stat-value {
    font-size: 1.75rem;
}

.panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.settings-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.75rem 1.5rem;
    margin: 1rem 0 1.5rem;
}

.settings-summary div {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.settings-summary dt {
    color: var(--muted);
}

.settings-summary dd {
    margin: 0;
}

.form-grid {
    display: grid;
    gap: 0.75rem;
    max-width: 520px;
}

.form-grid label {
    font-weight: 600;
}

.form-grid input[type="number"],
.form-grid input[type="text"],
.form-grid input[type="password"] {
    width: 100%;
    padding: 0.75rem 0.9rem;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text);
}

.form-grid input[type="checkbox"] {
    width: 1.1rem;
    height: 1.1rem;
    justify-self: start;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 1.2rem;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-weight: 600;
}

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

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

.btn-secondary {
    background: var(--surface-2);
    color: var(--text);
    border: 1px solid var(--border);
}

.alert {
    padding: 0.85rem 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
}

.alert-error {
    background: rgba(255, 107, 107, 0.12);
    border: 1px solid rgba(255, 107, 107, 0.35);
    color: #ffb4b4;
}

.alert-success {
    background: rgba(62, 207, 142, 0.12);
    border: 1px solid rgba(62, 207, 142, 0.35);
    color: #9ef0c8;
}

.table-wrap {
    overflow-x: auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

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

th,
td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border);
    text-align: right;
    vertical-align: top;
}

th {
    color: var(--muted);
    font-size: 0.9rem;
    background: var(--surface-2);
}

tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.payload {
    font-family: Consolas, monospace;
    font-size: 0.85rem;
    color: var(--muted);
    max-width: 360px;
    word-break: break-all;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: radial-gradient(circle at top, #1a2740, var(--bg) 55%);
}

.login-card {
    width: min(420px, calc(100% - 2rem));
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.login-card h1 {
    margin: 0;
}

.login-card .subtitle {
    color: var(--muted);
    margin: 0.25rem 0 1.5rem;
}

.login-card form {
    display: grid;
    gap: 0.75rem;
}

@media (max-width: 900px) {
    .admin-shell {
        grid-template-columns: 1fr;
    }

    .admin-nav {
        border-left: none;
        border-bottom: 1px solid var(--border);
    }

    .admin-nav nav {
        flex-direction: row;
        flex-wrap: wrap;
    }
}