.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  padding: 7px 14px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  transition: background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), box-shadow var(--transition-fast), transform 80ms ease-out;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-primary {
  background: linear-gradient(90deg, #4f46e5, #7c3aed, #22c55e);
  color: #f9fafb;
  border-color: rgba(15, 23, 42, 0.6);
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.45);
}

.btn-primary:hover {
  box-shadow: 0 18px 36px rgba(37, 99, 235, 0.6);
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.96);
  color: #e5e7eb;
  border-color: rgba(148, 163, 184, 0.7);
}

.btn-ghost {
  background: transparent;
  color: var(--color-on-dark);
  border-color: rgba(148, 163, 184, 0.5);
}

.btn-text {
  padding: 4px 8px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.btn-text:hover {
  background: rgba(15, 23, 42, 0.8);
  color: var(--color-on-dark);
}

.btn-text-link {
  background: transparent;
  border: none;
  padding: 0;
  font-size: var(--text-sm);
  color: #a5b4fc;
}

.btn-text-link:hover {
  text-decoration: underline;
}

.btn-lg {
  padding: 10px 18px;
}

.btn-sm {
  padding: 4px 10px;
  font-size: var(--text-xs);
}

.btn-icon {
  width: 30px;
  height: 30px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(148, 163, 184, 0.7);
  color: #e5e7eb;
}

.icon-plus::before {
  content: "+";
}

.icon-close::before {
  content: "×";
  font-size: 16px;
}