/* components/button/button-group.css */

/**
 * Button Group Component
 * Full accessibility support
 * Grouping and layout options for buttons
 */

/* ========================================
   BUTTON GROUP CUSTOM PROPERTIES
   ======================================== */

.c-button-group {
  /* Layout properties */
  --c-button-group-gap: 0;
  --c-button-group-padding: 0;
  --c-button-group-border-radius: var(--ds-radius-m);
  
  /* Visual properties */
  --c-button-group-background: transparent;
  --c-button-group-border-color: var(--ds-color-border);
  --c-button-group-border-width: 0;
  
  /* Segmented specific */
  --c-button-group-segmented-background: var(--ds-color-surface);
  --c-button-group-segmented-border-width: 1px;
  --c-button-group-divider-color: var(--ds-color-border);
  
  /* Toolbar specific */
  --c-button-group-toolbar-gap: var(--ds-space-s);
  --c-button-group-toolbar-padding: var(--ds-space-s);
  --c-button-group-toolbar-background: var(--ds-color-surface);
  --c-button-group-toolbar-border: 1px solid var(--ds-color-border);
}

/* ========================================
   BASE BUTTON GROUP STYLES
   ======================================== */

.c-button-group {
  display: inline-flex;
  align-items: center;
  gap: var(--c-button-group-gap);
  padding: var(--c-button-group-padding);
  background: var(--c-button-group-background);
  border-radius: var(--c-button-group-border-radius);
  position: relative;
  isolation: isolate;
}

/* Remove default button margins in groups */
.c-button-group > .c-button {
  margin: 0;
}

.c-button-group > .c-button + .c-button {
  margin-left: 0;
}

/* ========================================
   ORIENTATION VARIANTS
   ======================================== */

/* Horizontal (default) */
.c-button-group--horizontal {
  flex-direction: row;
}

/* Vertical */
.c-button-group--vertical {
  flex-direction: column;
  align-items: stretch;
}

.c-button-group--vertical > .c-button {
  width: 100%;
  justify-content: center;
}

/* ========================================
   SEGMENTED VARIANT
   ======================================== */

.c-button-group--segmented {
  --c-button-group-gap: 0;
  background: var(--c-button-group-segmented-background);
  border: var(--c-button-group-segmented-border-width) solid var(--c-button-group-border-color);
  padding: 0;
  overflow: hidden;
}

/* Horizontal segmented */
.c-button-group--segmented.c-button-group--horizontal > .c-button {
  border-radius: 0;
  border-left-width: 0;
  margin: 0;
  position: relative;
}

.c-button-group--segmented.c-button-group--horizontal > .c-button:first-child {
  border-top-left-radius: var(--c-button-group-border-radius);
  border-bottom-left-radius: var(--c-button-group-border-radius);
}

.c-button-group--segmented.c-button-group--horizontal > .c-button:last-child {
  border-top-right-radius: var(--c-button-group-border-radius);
  border-bottom-right-radius: var(--c-button-group-border-radius);
}

/* Dividers between segmented buttons */
.c-button-group--segmented.c-button-group--horizontal > .c-button:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 25%;
  right: 0;
  bottom: 25%;
  width: 1px;
  background: var(--c-button-group-divider-color);
  transition: opacity var(--ds-duration-fast) var(--ds-ease-out);
  pointer-events: none;
  z-index: 1;
}

/* Hide divider on hover/focus */
.c-button-group--segmented.c-button-group--horizontal > .c-button:hover::after,
.c-button-group--segmented.c-button-group--horizontal > .c-button:focus-visible::after,
.c-button-group--segmented.c-button-group--horizontal > .c-button:hover + .c-button::after,
.c-button-group--segmented.c-button-group--horizontal > .c-button:focus-visible + .c-button::after {
  opacity: 0;
}

/* Vertical segmented */
.c-button-group--segmented.c-button-group--vertical > .c-button {
  border-radius: 0;
  border-top-width: 0;
  margin: 0;
  position: relative;
}

.c-button-group--segmented.c-button-group--vertical > .c-button:first-child {
  border-top-left-radius: var(--c-button-group-border-radius);
  border-top-right-radius: var(--c-button-group-border-radius);
  border-top-width: var(--c-button-group-segmented-border-width);
}

.c-button-group--segmented.c-button-group--vertical > .c-button:last-child {
  border-bottom-left-radius: var(--c-button-group-border-radius);
  border-bottom-right-radius: var(--c-button-group-border-radius);
}

/* Vertical dividers */
.c-button-group--segmented.c-button-group--vertical > .c-button:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 25%;
  right: 25%;
  bottom: 0;
  height: 1px;
  background: var(--c-button-group-divider-color);
  transition: opacity var(--ds-duration-fast) var(--ds-ease-out);
  pointer-events: none;
}

/* ========================================
   TOGGLE GROUP VARIANT
   ======================================== */

.c-button-group--toggle {
  background: var(--ds-color-surface-raised);
  padding: var(--ds-space-xs);
  border: 1px solid var(--ds-color-border);
}

.c-button-group--toggle > .c-button {
  --c-button-background: transparent;
  --c-button-border-color: transparent;
}

.c-button-group--toggle > .c-button[aria-pressed="true"],
.c-button-group--toggle > .c-button--active {
  --c-button-background: var(--ds-color-surface);
  --c-button-border-color: var(--ds-color-border);
  box-shadow: var(--ds-shadow-xs);
}

/* ========================================
   SPLIT BUTTON VARIANT
   ======================================== */

.c-button-group--split {
  --c-button-group-gap: 0;
  position: relative;
}

.c-button-group--split > .c-button:first-child {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  padding-right: calc(var(--c-button-padding-inline) + var(--ds-space-xs));
}

.c-button-group--split > .c-button:last-child {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
  border-left: 1px solid var(--ds-color-border);
  padding: var(--c-button-padding-block) var(--ds-space-s);
  min-width: auto;
}

/* Split button dropdown trigger */
.c-button-group--split .c-button--dropdown-trigger {
  padding-left: var(--ds-space-s);
  padding-right: var(--ds-space-s);
}

.c-button-group--split .c-button--dropdown-trigger .c-button__icon {
  margin: 0;
}

/* ========================================
   TOOLBAR VARIANT
   ======================================== */

.c-button-group--toolbar {
  --c-button-group-gap: var(--c-button-group-toolbar-gap);
  padding: var(--c-button-group-toolbar-padding);
  background: var(--c-button-group-toolbar-background);
  border: var(--c-button-group-toolbar-border);
  border-radius: var(--c-button-group-border-radius);
  flex-wrap: wrap;
}

/* Toolbar separators */
.c-button-group__separator {
  width: 1px;
  height: 1.5em;
  background: var(--ds-color-border);
  margin: 0 var(--ds-space-s);
  align-self: center;
}

.c-button-group--vertical .c-button-group__separator {
  width: auto;
  height: 1px;
  margin: var(--ds-space-s) 0;
  align-self: stretch;
}

/* ========================================
   SIZE MODIFIERS
   ======================================== */

/* Small group */
.c-button-group--size-s {
  --c-button-group-border-radius: var(--ds-radius-s);
}

.c-button-group--size-s.c-button-group--toolbar {
  --c-button-group-toolbar-padding: var(--ds-space-xs);
  --c-button-group-toolbar-gap: var(--ds-space-xs);
}

/* Large group */
.c-button-group--size-l {
  --c-button-group-border-radius: var(--ds-radius-l);
}

.c-button-group--size-l.c-button-group--toolbar {
  --c-button-group-toolbar-padding: var(--ds-space-m);
  --c-button-group-toolbar-gap: var(--ds-space-m);
}

/* ========================================
   SPACING VARIANTS
   ======================================== */

.c-button-group--spacing-s {
  --c-button-group-gap: var(--ds-space-s);
}

.c-button-group--spacing-m {
  --c-button-group-gap: var(--ds-space-m);
}

.c-button-group--spacing-l {
  --c-button-group-gap: var(--ds-space-l);
}

/* ========================================
   ALIGNMENT VARIANTS
   ======================================== */

.c-button-group--align-start {
  justify-content: flex-start;
}

.c-button-group--align-center {
  justify-content: center;
}

.c-button-group--align-end {
  justify-content: flex-end;
}

.c-button-group--align-space-between {
  justify-content: space-between;
}

.c-button-group--align-space-around {
  justify-content: space-around;
}

/* ========================================
   FULL WIDTH VARIANT
   ======================================== */

.c-button-group--full-width {
  width: 100%;
}

.c-button-group--full-width > .c-button {
  flex: 1;
}

/* ========================================
   RESPONSIVE BEHAVIOR
   ======================================== */

/* Stack on mobile */
@media (max-width: 640px) {
  .c-button-group--responsive {
    flex-direction: column;
    width: 100%;
  }
  
  .c-button-group--responsive > .c-button {
    width: 100%;
  }
  
  .c-button-group--responsive.c-button-group--segmented > .c-button {
    border-radius: 0;
    border-left-width: var(--c-button-group-segmented-border-width);
    border-top-width: 0;
  }
  
  .c-button-group--responsive.c-button-group--segmented > .c-button:first-child {
    border-top-left-radius: var(--c-button-group-border-radius);
    border-top-right-radius: var(--c-button-group-border-radius);
    border-bottom-left-radius: 0;
    border-top-width: var(--c-button-group-segmented-border-width);
  }
  
  .c-button-group--responsive.c-button-group--segmented > .c-button:last-child {
    border-bottom-left-radius: var(--c-button-group-border-radius);
    border-bottom-right-radius: var(--c-button-group-border-radius);
    border-top-right-radius: 0;
  }
  
  .c-button-group--responsive .c-button-group__separator {
    width: auto;
    height: 1px;
    margin: var(--ds-space-s) 0;
  }
}

/* ========================================
   Z-INDEX MANAGEMENT
   ======================================== */

.c-button-group {
  z-index: 0;
}

.c-button-group > .c-button {
  z-index: 0;
}

.c-button-group > .c-button:hover {
  z-index: 1;
}

.c-button-group > .c-button:focus-visible {
  z-index: 2;
}

.c-button-group > .c-button:active {
  z-index: 1;
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Button group role and label */
.c-button-group[role="group"][aria-label],
.c-button-group[role="toolbar"][aria-label] {
  position: relative;
}

/* Toggle group ARIA states */
.c-button-group--toggle[role="group"] > .c-button[aria-pressed] {
  position: relative;
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .c-button-group--segmented {
    border-width: 2px;
  }
  
  .c-button-group--segmented > .c-button::after {
    background: currentColor;
  }
}

/* Print styles */
@media print {
  .c-button-group {
    border: 1px solid black;
    background: white;
  }
  
  .c-button-group > .c-button {
    border: 1px solid black;
  }
}