.format-group { display: flex; }

.format-btn {
  flex: 1;
  border: 2px solid var(--border);
  border-left: none;
  background: var(--surface);
  color: var(--ink);
  font-family: inherit;
  padding: 0.55rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.format-btn:first-child { border-left: 2px solid var(--border); }

.format-btn:hover {
  background: var(--invert);
  color: #fff;
}