.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  background: #111827;
  color: #ffffff;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.25);
  transition: background var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-fast),
    border-color var(--transition-fast);
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.35);
}

.btn--secondary {
  background: #ffffff;
  color: var(--color-primary);
  border-color: rgba(37, 99, 235, 0.25);
  box-shadow: var(--shadow-subtle);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: rgba(148, 163, 184, 0.5);
  box-shadow: none;
}

.btn--sm {
  padding: 0.35rem 0.7rem;
  font-size: var(--font-size-xs);
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.28);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}