.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.01em;
  white-space: nowrap;
  cursor: pointer;
  transition:
    transform var(--dur-base) var(--ease-spring-soft),
    box-shadow var(--dur-base) var(--ease-out-quart),
    background var(--dur-fast) var(--ease-out-quart),
    color var(--dur-fast) var(--ease-out-quart);
  will-change: transform;
  position: relative;
  isolation: isolate;
}

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

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn-primary {
  background: var(--grad-signature);
  color: var(--paper);
  box-shadow: var(--shadow-md);
}

.btn-primary::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--grad-signature);
  opacity: 0;
  filter: blur(16px);
  transition: opacity var(--dur-base) var(--ease-out-quart);
  z-index: -1;
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover::before {
  opacity: 0.6;
}

.btn-secondary {
  background: transparent;
  color: currentColor;
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background: rgba(139, 92, 246, 0.08);
  border-color: var(--violet-500);
}

.section-dark .btn-secondary,
.section-gradient-aurora .btn-secondary,
.section-gradient-deep .btn-secondary {
  border-color: var(--color-border-inverse);
}

.section-dark .btn-secondary:hover,
.section-gradient-aurora .btn-secondary:hover,
.section-gradient-deep .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--violet-400);
}

.btn-ghost {
  background: transparent;
  color: currentColor;
  padding-inline: var(--space-4);
}

.btn-ghost:hover {
  color: var(--violet-500);
}

.btn-lg {
  padding: var(--space-5) var(--space-8);
  font-size: var(--fs-body-lg);
}

.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-body-sm);
}

.btn .arrow {
  display: inline-block;
  transition: transform var(--dur-base) var(--ease-spring-soft);
}

.btn:hover .arrow {
  transform: translateX(4px);
}

.btn[data-magnetic] {
  transition: transform var(--dur-fast) var(--ease-out-quart);
}