.ytthumb-wrap {
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 16px;
  background: #fff;
}
.ytthumb-title { margin: 0 0 12px; font-size: 1.25rem; }
.ytthumb-form { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.ytthumb-input { flex: 1 1 360px; padding: 10px 12px; border: 1px solid #d1d5db; border-radius: 8px; }
.ytthumb-btn { padding: 10px 14px; border: 0; background: #ef4444; color: #fff; border-radius: 8px; cursor: pointer; }
.ytthumb-results { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.ytthumb-tip { grid-column: 1/-1; color: #6b7280; margin: 4px 0 12px; }
.ytthumb-card { border: 1px solid #e5e7eb; border-radius: 10px; padding: 12px; background: #fafafa; }
.ytthumb-card h4 { margin: 0 0 8px; }
.ytthumb-dl { display: inline-block; margin: 0 0 8px; text-decoration: none; padding: 6px 10px; border-radius: 6px; background: #111827; color: #fff; }
.ytthumb-card img { display: block; width: 100%; height: auto; border-radius: 6px; }