* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6fb;
    color: #1f2937;
}

.header {
    background: #111827;
    color: #ffffff;
    padding: 18px 24px;
}

.header h1 {
    margin: 0;
    font-size: 22px;
}

.header p {
    margin: 6px 0 0;
    color: #cbd5e1;
    font-size: 14px;
}

.container {
    max-width: 1200px;
    margin: 24px auto;
    padding: 0 16px;
}

.card {
    background: #ffffff;
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 18px;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.card h2 {
    margin-top: 0;
    font-size: 20px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.stat {
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 16px;
}

.stat .number {
    font-size: 28px;
    font-weight: bold;
    color: #111827;
}

.stat .label {
    font-size: 13px;
    color: #6b7280;
    margin-top: 4px;
}

.status-ok {
    color: #047857;
    font-weight: bold;
}

.status-bad {
    color: #b91c1c;
    font-weight: bold;
}

.btn {
    display: inline-block;
    padding: 10px 14px;
    background: #2563eb;
    color: #ffffff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 14px;
}

.btn:hover {
    background: #1d4ed8;
}

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

.table th,
.table td {
    padding: 12px;
    border-bottom: 1px solid #e5e7eb;
    text-align: left;
    font-size: 14px;
}

.table th {
    background: #f9fafb;
}

.warning {
    background: #fff7ed;
    border: 1px solid #fed7aa;
    color: #9a3412;
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 16px;
}

@media (max-width: 900px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 520px) {
    .grid {
        grid-template-columns: 1fr;
    }
}