.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 38px;
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-primary {
  background: var(--color-button);
  border-color: var(--color-button);
  color: #fff;
}
.btn-primary:hover {
  filter: brightness(.96);
}
.btn-secondary {
  background: #eef2ff;
  color: #3730a3;
  border-color: #c7d2fe;
}
.btn-danger {
  background: #fee2e2;
  border-color: #fecaca;
  color: #991b1b;
}
.btn-ghost {
  background: transparent;
}
.btn-small {
  min-height: 32px;
  padding: 6px 9px;
  font-size: 13px;
}
.btn-full { width: 100%; }