.nti-btn {
  display: inline-block;
  border: 1px solid transparent;
  border-radius: var(--nti-radius-sm);
  padding: var(--nti-space-2) 14px;
  font-size: 14px;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  text-align: center;
}

.nti-btn:focus-visible {
  outline: 2px solid var(--nti-color-primary);
  outline-offset: 2px;
}

.nti-btn:disabled,
.nti-btn-disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.nti-btn-primary,
.tool-card .primary,
.tool-card a.tool-link,
.upload-bar label.upload-button {
  background: var(--nti-color-primary);
  color: #fff;
  border-color: var(--nti-color-primary);
}

.nti-btn-primary:hover,
.tool-card .primary:hover,
.tool-card a.tool-link:hover,
.upload-bar label.upload-button:hover {
  background: var(--nti-color-primary-hover);
}

.nti-btn-secondary,
.back-link,
.back-button {
  background: var(--nti-color-surface);
  color: var(--nti-color-text);
  border: 1px solid #cbd5e1;
}

.nti-btn-secondary:hover,
.back-link:hover,
.back-button:hover {
  background: #f9fafb;
}

.tool-card .tool-disabled-btn {
  background: #f3f4f6;
  color: #9ca3af;
  cursor: not-allowed;
}

.upload-bar label.upload-button input {
  display: none;
}

.zoom-btn {
  background: var(--nti-color-surface);
  color: var(--nti-color-text);
  border: 1px solid #cbd5e1;
  border-radius: var(--nti-radius-sm);
  padding: var(--nti-space-2) var(--nti-space-3);
  font-size: 14px;
  cursor: pointer;
  white-space: normal;
  min-width: 0;
}

.zoom-btn:hover {
  background: #f9fafb;
}

.zoom-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}