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

.header {
    background: #111827;
    color: white;
    padding: 28px 40px;
}

.header p {
    color: #cbd5e1;
}

.content {
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: white;
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 6px 18px rgba(15,23,42,.08);
    margin-bottom: 20px;
}

a {
    color: #2563eb;
    text-decoration: none;
    font-weight: bold;
}

.muted {
    color: #64748b;
}

button {
    background: #111827;
    color: white;
    border: 0;
    border-radius: 8px;
    padding: 10px 14px;
    font-weight: bold;
    cursor: pointer;
}

.theme-panel {
    background: #111827;
    color: white;
    border-radius: 14px;
    padding: 20px;
    margin-top: 24px;
}

.theme-panel .muted {
    color: #cbd5e1;
}