.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s, opacity 0.15s, box-shadow 0.15s;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--secondary);
  color: var(--text);
  transition: background 0.3s, color 0.3s;
}

.btn-secondary:hover:not(:disabled) {
  background: var(--secondary-hover);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger-hover);
}

.btn-cancel {
  border: 1px solid #ef4444;
  color: #ef4444;
  background: transparent;
  padding: 0.55rem 1.2rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
}
.btn-cancel:hover {
  background: #fef2f2;
}

.btn .spinner {
  width: 18px;
  height: 18px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.8rem; }