.hv-slab { margin: 1rem 0 2rem; }
.hv-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.hv-grid textarea {
    width: 95%;
    min-height: 420px;
    resize: none;
    background-color: #1a1a1a;
    color: #f0f0f0;
    padding: 10px 20px;
    border: 1px solid #444;
    border-radius: 4px;
    font-family: monospace;
}
.hv-preview { width: 95%; padding: 1rem; border: 1px solid #333; border-radius: .5rem; background: #0f0f0f; overflow: auto; }
.hv-btn {
    background-color: #333;
    color: #fff;
    padding: 10px 20px;
    border: 1px solid #555;
    cursor: pointer;
    border-radius: 4px;
    font-family: monospace;
}
.hv-note { color: #9aa; font-size: .9rem; }
@media (max-width: 960px) { .hv-grid { grid-template-columns: 1fr; } }