.vi-wrapper { max-width: 640px; margin: 1rem 0; }
#vi-form { display: flex; gap: .5rem; align-items: center; }
#vi-result { background:#f7f7f7; border:1px solid #ddd; padding: .75rem;
margin-top: .75rem; white-space: pre-wrap; }
.vi-progress { height: 8px; background: #eee; border-radius: 6px; overflow:
hidden; margin-top: .5rem; }
.vi-bar { height: 100%; width: 0; background: #4caf50; transition: width .2s
ease; }