* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f9;
    color: #1f2937;
}

a {
    color: inherit;
    text-decoration: none;
}

.login-body {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f172a, #1e3a5f);
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: #ffffff;
    border-radius: 18px;
    padding: 32px;
    box-shadow: 0 20px 60px rgba(0,0,0,.25);
}

.login-card h1 {
    margin: 0 0 8px;
    font-size: 26px;
}

.login-card p {
    margin: 0 0 24px;
    color: #6b7280;
}

label {
    display: block;
    margin: 14px 0 6px;
    font-weight: 600;
}

input, select {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #d1d5db;
    border-radius: 10px;
    font-size: 15px;
}

button, .btn {
    display: inline-block;
    margin-top: 18px;
    padding: 12px 18px;
    border: 0;
    border-radius: 10px;
    background: #1e3a5f;
    color: #ffffff;
    font-weight: 700;
    cursor: pointer;
}

button:hover, .btn:hover {
    background: #142942;
}

.alert {
    padding: 12px;
    border-radius: 10px;
    background: #fee2e2;
    color: #991b1b;
    margin-bottom: 16px;
}

.success {
    padding: 12px;
    border-radius: 10px;
    background: #dcfce7;
    color: #166534;
    margin-bottom: 16px;
}

.topbar {
    height: 64px;
    background: #0f172a;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.topbar a {
    color: #bfdbfe;
}

.layout {
    display: flex;
    min-height: calc(100vh - 64px);
}

.sidebar {
    width: 230px;
    background: #1e293b;
    color: #ffffff;
    padding: 20px;
}

.sidebar a {
    display: block;
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 8px;
    background: rgba(255,255,255,.06);
}

.sidebar a:hover {
    background: rgba(255,255,255,.14);
}

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

.content h1 {
    margin-top: 0;
}

.cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    margin-top: 24px;
}

.card {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(15,23,42,.08);
}

.card span {
    display: block;
    color: #6b7280;
    margin-bottom: 8px;
}

.card strong {
    font-size: 34px;
}

.table-box {
    background: #ffffff;
    border-radius: 16px;
    padding: 18px;
    box-shadow: 0 10px 30px rgba(15,23,42,.08);
    overflow-x: auto;
}

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

th, td {
    padding: 12px;
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
}

th {
    background: #f8fafc;
}

.badge {
    display: inline-block;
    padding: 5px 9px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
}

.badge-on {
    background: #dcfce7;
    color: #166534;
}

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

.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn-small {
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 13px;
    margin-top: 0;
}

.btn-danger {
    background: #991b1b;
}

.btn-success {
    background: #166534;
}

@media (max-width: 768px) {
    .layout {
        display: block;
    }

    .sidebar {
        width: 100%;
        display: flex;
        gap: 8px;
        overflow-x: auto;
    }

    .sidebar a {
        white-space: nowrap;
    }

    .cards {
        grid-template-columns: 1fr;
    }

    .topbar {
        height: auto;
        gap: 10px;
        align-items: flex-start;
        flex-direction: column;
        padding: 16px;
    }

    .content {
        padding: 18px;
    }
}