* {
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --bg: #f4f7fb;
    --card: #ffffff;
    --text: #172033;
    --muted: #64748b;
    --border: #dbe3ef;
    --danger: #dc2626;
    --success: #16a34a;
    --warning: #d97706;
    --shadow: 0 10px 25px rgba(15, 23, 42, .08);
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

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

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

.sidebar {
    width: 260px;
    background: #0f172a;
    color: #fff;
    padding: 22px;
}

.sidebar h1 {
    font-size: 20px;
    margin: 0 0 26px;
}

.sidebar a {
    display: block;
    color: #e2e8f0;
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 8px;
}

.sidebar a:hover,
.sidebar a.active {
    background: rgba(255, 255, 255, .12);
}

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

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 22px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.grid {
    display: grid;
    gap: 16px;
}

.grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.metric {
    padding: 20px;
    border-radius: 18px;
    background: #fff;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.metric span {
    color: var(--muted);
    font-size: 14px;
}

.metric strong {
    display: block;
    font-size: 30px;
    margin-top: 8px;
}

label {
    font-weight: 700;
    font-size: 14px;
    display: block;
    margin-bottom: 6px;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 11px 12px;
    font-size: 14px;
    background: #fff;
}

textarea {
    min-height: 90px;
    resize: vertical;
}

button,
.btn {
    display: inline-block;
    border: 0;
    background: var(--primary);
    color: #fff;
    padding: 11px 16px;
    border-radius: 10px;
    font-weight: 700;
    cursor: pointer;
}

button:hover,
.btn:hover {
    background: var(--primary-dark);
    color: #fff;
}

.btn-secondary {
    background: #334155;
}

.btn-danger {
    background: var(--danger);
}

.alert {
    padding: 14px 16px;
    border-radius: 12px;
    margin-bottom: 16px;
    border: 1px solid var(--border);
    background: #fff;
}

.alert.success {
    border-color: #bbf7d0;
    background: #f0fdf4;
    color: #166534;
}

.alert.error {
    border-color: #fecaca;
    background: #fef2f2;
    color: #991b1b;
}

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

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

th,
td {
    padding: 12px 10px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    text-align: left;
    vertical-align: top;
}

th {
    color: #475569;
    font-size: 12px;
    text-transform: uppercase;
    background: #f8fafc;
}

.badge {
    display: inline-block;
    padding: 5px 9px;
    border-radius: 999px;
    background: #e0ecff;
    color: #1e40af;
    font-weight: 700;
    font-size: 12px;
}

.login-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
}

.login-box {
    width: 100%;
    max-width: 420px;
}

.small {
    color: var(--muted);
    font-size: 13px;
}

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: end;
}

@media (max-width: 900px) {
    .wrapper {
        display: block;
    }

    .sidebar {
        width: 100%;
    }

    .grid-4,
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .main {
        padding: 18px;
    }

    .topbar {
        display: block;
    }
}