body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f7fa;
    color: #222;
}

#demo-panel {
    max-width: 860px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,.08);
    overflow: hidden;
}

    #demo-panel header {
        background: #0084ff;
        color: #fff;
        padding: 1.25rem 1.5rem;
        font-size: 1.25rem;
        font-weight: 600;
    }

    #demo-panel .content {
        padding: 1.5rem;
    }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th, td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid #eee;
    vertical-align: top;
}

th {
    width: 180px;
    color: #555;
    font-weight: 500;
    background: #fafbfc;
}

td {
    word-break: break-all;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.9rem;
}

.btn-row {
    margin-top: 1.75rem;
    text-align: center;
}

.btn {
    display: inline-block;
    background: #0084ff;
    color: #fff;
    border: none;
    padding: 0.9rem 2.2rem;
    font-size: 1.05rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    text-decoration: none;
    transition: background .15s;
}

    .btn:hover {
        background: #0066cc;
    }

.loading {
    text-align: center;
    padding: 3rem;
    color: #666;
}

.note {
    margin-top: 1.25rem;
    font-size: 0.85rem;
    color: #666;
    line-height: 1.4;
}