/**
 * Icon Button Component - Material Design 3 SCSS Module
 * ==================================================================
 * M3-compliant icon button with proper states and sizing
 */

// =============================================================================
// CSS Variables for M3 Icon Button Tokens
// =============================================================================
$icon-button-size: 40px;
$icon-button-size-sm: 32px;
$icon-button-size-lg: 48px;
$icon-button-icon-size: 24px;
$icon-button-icon-size-sm: 20px;
$icon-button-icon-size-lg: 28px;

// =============================================================================
// Base Icon Button
// =============================================================================
.iconButton {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: $icon-button-size;
  height: $icon-button-size;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--mat-sys-on-surface-variant);
  cursor: pointer;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
  outline: none;
  transition:
    background-color 100ms ease,
    color 100ms ease;

  // Icon sizing
  svg {
    width: $icon-button-icon-size;
    height: $icon-button-icon-size;
    flex-shrink: 0;
  }

  // State layer (for hover/focus/active)
  &::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: currentColor;
    opacity: 0;
    transition: opacity 100ms ease;
    pointer-events: none;
  }

  // Hover state
  &:hover:not(:disabled)::before {
    opacity: 0.08;
  }

  // Focus state
  &:focus-visible {
    outline: 2px solid var(--mat-sys-primary);
    outline-offset: 2px;
  }

  &:focus-visible::before {
    opacity: 0.12;
  }

  // Active/pressed state
  &:active:not(:disabled)::before {
    opacity: 0.12;
  }

  // Disabled state
  &:disabled {
    color: color-mix(in srgb, var(--mat-sys-on-surface) 38%, transparent);
    cursor: not-allowed;
  }
}

// =============================================================================
// Size Variants
// =============================================================================
.iconButtonSm {
  width: $icon-button-size-sm;
  height: $icon-button-size-sm;

  svg {
    width: $icon-button-icon-size-sm;
    height: $icon-button-icon-size-sm;
  }
}

.iconButtonLg {
  width: $icon-button-size-lg;
  height: $icon-button-size-lg;

  svg {
    width: $icon-button-icon-size-lg;
    height: $icon-button-icon-size-lg;
  }
}

// =============================================================================
// Color Variants
// =============================================================================
.iconButtonPrimary {
  color: var(--mat-sys-primary);
}

.iconButtonSecondary {
  color: var(--mat-sys-secondary);
}

.iconButtonError {
  color: var(--mat-sys-error);
}

.iconButtonSuccess {
  color: var(--mat-sys-tertiary);
}

.iconButtonInherit {
  color: inherit;
}

// =============================================================================
// Filled Variant (tonal background)
// =============================================================================
.iconButtonFilled {
  background: var(--mat-sys-surface-container-highest);

  &:hover:not(:disabled) {
    background: var(--mat-sys-surface-container-high);
  }
}

.iconButtonFilledPrimary {
  background: var(--mat-sys-primary-container);
  color: var(--mat-sys-on-primary-container);

  &:hover:not(:disabled) {
    background: color-mix(in srgb, var(--mat-sys-primary-container) 92%, var(--mat-sys-on-primary-container));
  }
}

// =============================================================================
// Outlined Variant
// =============================================================================
.iconButtonOutlined {
  border: 1px solid var(--mat-sys-outline);

  &:hover:not(:disabled) {
    background: color-mix(in srgb, var(--mat-sys-on-surface-variant) 8%, transparent);
  }
}

// =============================================================================
// Edge Alignment (for toolbar positioning)
// =============================================================================
.iconButtonEdgeStart {
  margin-left: -8px;
}

.iconButtonEdgeEnd {
  margin-right: -8px;
}