Magnetic Button

---
interface Props {
  href?: string;
  type?: 'button' | 'submit' | 'reset';
  variant?: 'primary' | 'secondary' | 'ghost';
  size?: 'sm' | 'md' | 'lg';
  strength?: number;
  disabled?: boolean;
}

const { 
  href, 
  type = 'button', 
  variant = 'secondary', 
  size = 'md',
  strength = 0.5,
  disabled = false 
} = Astro.props;

const Tag = href ? 'a' : 'button';
---

<Tag 
  href={href} 
  type={href ? undefined : type}
  disabled={disabled}
  class={`magnetic-btn magnetic-btn--${variant} magnetic-btn--${size}`}
  data-strength={strength}
>
  <span class="magnetic-btn__inner">
    <slot />
  </span>
</Tag>

<style>
  .magnetic-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: none;
    border-radius: var(--r-full, 9999px);
    cursor: pointer;
    text-decoration: none;
    position: relative;
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1), box-shadow 0.3s ease;
    user-select: none;
    font-family: var(--font-sans, inherit);
    font-weight: 600;
    white-space: nowrap;
  }

  .magnetic-btn__inner {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    pointer-events: none;
  }

  /* Variants */
  .magnetic-btn--primary {
    background: var(--c-primary, #6366f1);
    color: #fff;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
  }

  .magnetic-btn--secondary {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(12px);
    color: var(--c-text-1, #f8fafc);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .magnetic-btn--ghost {
    background: transparent;
    color: var(--c-primary-light, #818cf8);
    border: 1px solid rgba(99, 102, 241, 0.3);
  }

  .magnetic-btn:hover:not(:disabled) {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  }

  .magnetic-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(1);
  }

  /* Sizes */
  .magnetic-btn--sm { min-width: 80px; min-height: 40px; }
  .magnetic-btn--sm .magnetic-btn__inner { padding: 0.5rem 1.2rem; font-size: 0.8rem; }
  
  .magnetic-btn--md { min-width: 120px; min-height: 50px; }
  .magnetic-btn--md .magnetic-btn__inner { padding: 0.8rem 1.8rem; font-size: 0.95rem; }
  
  .magnetic-btn--lg { min-width: 160px; min-height: 64px; }
  .magnetic-btn--lg .magnetic-btn__inner { padding: 1.1rem 2.5rem; font-size: 1.1rem; }
</style>

<script>
  function initMagnetic() {
    const btns = document.querySelectorAll('.magnetic-btn:not([data-magnetic-init])');
    
    btns.forEach(btn => {
      btn.setAttribute('data-magnetic-init', 'true');
      const inner = btn.querySelector('.magnetic-btn__inner') as HTMLElement;
      const strengthAttr = btn.getAttribute('data-strength');
      const strength = strengthAttr ? parseFloat(strengthAttr) : 0.5;

      btn.addEventListener('mousemove', (e: any) => {
        const rect = btn.getBoundingClientRect();
        const x = (e.clientX - rect.left - rect.width / 2) * strength;
        const y = (e.clientY - rect.top - rect.height / 2) * strength;

        (btn as HTMLElement).style.transform = `translate(${x}px, ${y}px)`;
        if (inner) inner.style.transform = `translate(${x * 0.4}px, ${y * 0.4}px)`;
      });

      btn.addEventListener('mouseleave', () => {
        (btn as HTMLElement).style.transform = `translate(0px, 0px)`;
        if (inner) inner.style.transform = `translate(0px, 0px)`;
      });
    });
  }

  // Initial and view transition support
  initMagnetic();
  document.addEventListener('astro:after-swap', initMagnetic);
</script>