Loading Spinner Button

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

const { 
  isLoading = false, 
  href, 
  type = 'button', 
  variant = 'primary', 
  size = 'md',
  disabled = false 
} = Astro.props;

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

<Tag 
  href={href} 
  type={href ? undefined : type}
  disabled={disabled || isLoading}
  class:list={[
    "load-btn", 
    `load-btn--${variant}`, 
    `load-btn--${size}`, 
    { "is-loading": isLoading }
  ]}
>
  <span class="load-btn__content">
    <slot />
  </span>
  <span class="load-btn__spinner">
    <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round">
      <path d="M12 2v4M12 18v4M4.93 4.93l2.83 2.83M16.24 16.24l2.83 2.83M2 12h4M18 12h4M4.93 19.07l2.83-2.83M16.24 7.76l2.83-2.83"/>
    </svg>
  </span>
</Tag>

<style>
  .load-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-sans, inherit);
    font-weight: 600;
    letter-spacing: 0.02em;
    border-radius: var(--r-md, 12px);
    cursor: pointer;
    text-decoration: none;
    border: 1px solid transparent;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    white-space: nowrap;
    user-select: none;
  }

  .load-btn__content {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .load-btn__spinner {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.5);
    transition: all 0.2s ease;
    pointer-events: none;
  }

  .load-btn__spinner svg {
    width: 1.25em;
    height: 1.25em;
    animation: spin 1s linear infinite;
  }

  /* Loading State */
  .load-btn.is-loading {
    cursor: wait;
  }
  
  .load-btn.is-loading .load-btn__content {
    opacity: 0;
    transform: translateY(5px);
  }

  .load-btn.is-loading .load-btn__spinner {
    opacity: 1;
    transform: scale(1);
  }

  @keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
  }

  /* Variants */
  .load-btn--primary {
    background: var(--c-primary, #6366f1);
    color: #fff;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.2);
  }
  .load-btn--primary:hover:not(:disabled) {
    background: var(--c-primary-light, #818cf8);
    transform: translateY(-1px);
  }

  .load-btn--secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--c-text-1, #f8fafc);
    border-color: var(--c-border, rgba(255, 255, 255, 0.1));
  }
  .load-btn--secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.08);
  }

  .load-btn--ghost {
    background: transparent;
    color: var(--c-primary-light, #818cf8);
    border-color: rgba(99, 102, 241, 0.3);
  }
  .load-btn--ghost:hover:not(:disabled) {
    background: rgba(99, 102, 241, 0.05);
  }

  /* Sizes / Layout */
  .load-btn--sm { padding: 0.45rem 1rem; font-size: 0.825rem; min-width: 100px; }
  .load-btn--md { padding: 0.75rem 1.6rem; font-size: 0.95rem; min-width: 140px; }
  .load-btn--lg { padding: 1rem 2.2rem; font-size: 1.1rem; min-width: 180px; }

  .load-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(1);
  }
</style>