.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 2rem;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.02em;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition:
    background-color var(--transition-base),
    color            var(--transition-base),
    border-color     var(--transition-base),
    box-shadow       var(--transition-base),
    transform        var(--transition-fast);
  white-space: nowrap;
  -webkit-user-select: none;
  user-select: none;
}

.btn:hover  { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

/* Primary */
.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  border: none;
  box-shadow: 0 4px 14px rgba(0, 0, 255, 0.2);
  background-size: 200% auto;
  transition: background-position var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
}

.btn-primary:hover {
  background-position: right center;
  box-shadow: 0 6px 20px rgba(0, 204, 255, 0.4);
  transform: translateY(-2px);
}

/* Secondary / Outline */
.btn-outline {
  background-color: transparent;
  color: var(--color-royal-blue);
  border: 2px solid var(--color-royal-blue);
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base), transform var(--transition-fast), box-shadow var(--transition-base);
}

.btn-outline:hover {
  background: var(--gradient-primary);
  color: var(--color-white);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 255, 0.15);
}

/* Ghost (text button) */
.btn-ghost {
  background-color: transparent;
  color: var(--color-dark);
  padding-inline: var(--space-4);
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--color-royal-blue);
}

/* White (on dark/colored backgrounds) */
.btn-white {
  background-color: var(--color-white);
  color: var(--color-royal-blue);
  border-color: var(--color-white);
}

.btn-white:hover {
  background-color: transparent;
  color: var(--color-white);
}

/* Sizes */
.btn-sm {
  padding: 0.625rem 1.5rem;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: 1.125rem 2.5rem;
  font-size: var(--text-base);
}

/* Icon Button */
.btn-icon {
  padding: 0.75rem;
  border-radius: var(--radius-full);
  line-height: 1;
}

/* Arrow Link */
.arrow-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-royal-blue);
  text-decoration: none;
  transition: gap var(--transition-base), color var(--transition-base);
}

.arrow-link:hover {
  gap: var(--space-4);
}

.arrow-link svg,
.arrow-link .arrow {
  transition: transform var(--transition-base);
}

.arrow-link:hover svg,
.arrow-link:hover .arrow {
  transform: translateX(4px);
}