/*
 * Button styles
 * All button variants, sizes, and states
 */

@layer components {
  /* Base button */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    gap: var(--space-2);
    padding: var(--space-2_5) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: 1;
    text-decoration: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    white-space: nowrap;
    transition: 
      background-color var(--duration-fast) var(--ease-out),
      border-color var(--duration-fast) var(--ease-out),
      box-shadow var(--duration-fast) var(--ease-out),
      transform var(--duration-fast) var(--ease-out),
      color var(--duration-fast) var(--ease-out);

    &:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }

    &:active:not(:disabled) {
      transform: scale(0.98);
    }

    /* Ensure inline SVG icons don't affect button height */
    & svg {
      display: block;
      flex-shrink: 0;
      height: 1em;
      width: auto;
    }
  }

  /* ==========================================================================
     Sizes
     ========================================================================== */

  .btn-sm {
    padding: var(--space-1_5) var(--space-3);
    font-size: var(--text-xs);
    border-radius: var(--radius-md);
  }

  .btn-lg {
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-base);
  }

  /* ==========================================================================
     Variants
     ========================================================================== */

  .btn-primary {
    color: white;
    background-color: var(--color-primary);
    border: 1px solid var(--color-primary);
    box-shadow: 
      0 1px 2px rgb(0 0 0 / 0.08),
      inset 0 1px 0 rgb(255 255 255 / 0.1);

    &:hover:not(:disabled) {
      background-color: var(--color-primary-hover);
      border-color: var(--color-primary-hover);
      box-shadow: 
        0 2px 4px rgb(0 0 0 / 0.12),
        inset 0 1px 0 rgb(255 255 255 / 0.1);
      text-decoration: none;
    }

    &:focus-visible {
      outline: none;
      box-shadow: 
        0 0 0 2px var(--color-canvas),
        0 0 0 4px var(--color-primary);
    }
  }

  .btn-secondary {
    color: var(--color-ink);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    box-shadow: 0 1px 2px rgb(0 0 0 / 0.04);

    &:hover:not(:disabled) {
      background-color: var(--color-surface-muted);
      border-color: var(--color-border-strong);
      text-decoration: none;
    }

    &:focus-visible {
      outline: none;
      box-shadow: 
        0 0 0 2px var(--color-canvas),
        0 0 0 4px var(--color-primary);
    }
  }

  .btn-ghost {
    color: var(--color-ink-muted);
    background-color: transparent;
    border: 1px solid transparent;

    &:hover:not(:disabled) {
      color: var(--color-ink);
      background-color: var(--color-surface-muted);
      text-decoration: none;
    }

    &:focus-visible {
      outline: none;
      box-shadow: 0 0 0 2px var(--color-primary);
    }
  }

  .btn-danger {
    color: white;
    background-color: var(--color-negative);
    border: 1px solid var(--color-negative);
    box-shadow: 
      0 1px 2px rgb(0 0 0 / 0.08),
      inset 0 1px 0 rgb(255 255 255 / 0.1);

    &:hover:not(:disabled) {
      background-color: color-mix(in oklch, var(--color-negative) 85%, black);
      border-color: color-mix(in oklch, var(--color-negative) 85%, black);
      text-decoration: none;
    }

    &:focus-visible {
      outline: none;
      box-shadow: 
        0 0 0 2px var(--color-canvas),
        0 0 0 4px var(--color-negative);
    }
  }

  /* ==========================================================================
     Modifiers
     ========================================================================== */

  /* Icon-only button */
  .btn-icon {
    padding: var(--space-2);
    
    & svg {
      width: 1.25rem;
      height: 1.25rem;
    }
  }

  /* Button group */
  .btn-group {
    display: inline-flex;

    & .btn {
      border-radius: 0;

      &:first-child {
        border-radius: var(--radius-lg) 0 0 var(--radius-lg);
      }

      &:last-child {
        border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
      }

      &:not(:last-child) {
        border-inline-end: none;
      }
    }
  }

  /* ==========================================================================
     States
     ========================================================================== */

  /* Copied state for clipboard buttons */
  .btn-copied {
    color: var(--color-positive) !important;
    border-color: var(--color-positive-border) !important;
    background-color: var(--color-positive-canvas) !important;
    transition: all var(--duration-fast) var(--ease-out);
  }

  .btn-copied-fade {
    opacity: 0;
    transition: opacity var(--duration-normal) var(--ease-out);
  }
}