/* components/filter-dropdown/filter-dropdown.css */
/* Filter Dropdown Component - Design System */

/* ========================================
   Component Variables
   ======================================== */

.c-filter-dropdown {
  /* Base */
  --filter-dropdown-font-family: var(--ds-font-family-sans);
  --filter-dropdown-font-size: var(--ds-font-size-m);
  --filter-dropdown-line-height: var(--ds-line-height-m);
  --filter-dropdown-text-color: var(--ds-color-text);
  
  /* Trigger Button */
  --filter-dropdown-trigger-bg: var(--ds-color-surface);
  --filter-dropdown-trigger-bg-hover: var(--ds-color-surface-raised);
  --filter-dropdown-trigger-bg-active: var(--ds-color-surface-lowered);
  --filter-dropdown-trigger-border: var(--ds-color-border);
  --filter-dropdown-trigger-border-hover: var(--ds-color-border-hover);
  --filter-dropdown-trigger-border-width: 1px;
  --filter-dropdown-trigger-border-style: dashed;
  --filter-dropdown-trigger-border-radius: var(--ds-radius-m);
  --filter-dropdown-trigger-padding: 0.75rem 1rem;
  --filter-dropdown-trigger-gap: var(--ds-space-s);
  --filter-dropdown-trigger-min-height: 2.75rem;
  --filter-dropdown-trigger-transition: all var(--ds-duration-fast) var(--ds-ease-out);
  
  /* Dropdown Panel */
  --filter-dropdown-panel-bg: var(--ds-color-surface);
  --filter-dropdown-panel-border: var(--ds-color-border);
  --filter-dropdown-panel-border-width: 1px;
  --filter-dropdown-panel-border-radius: var(--ds-radius-m);
  --filter-dropdown-panel-shadow: var(--ds-shadow-l);
  --filter-dropdown-panel-padding: var(--ds-space-s);
  --filter-dropdown-panel-max-height: 400px;
  --filter-dropdown-panel-min-width: 280px;
  --filter-dropdown-panel-max-width: 400px;
  --filter-dropdown-panel-z-index: 1100;
  --filter-dropdown-panel-gap: var(--ds-space-xs);
  
  /* Search Input */
  --filter-dropdown-search-padding: var(--ds-space-s);
  --filter-dropdown-search-border-bottom: 1px solid var(--ds-color-border);
  --filter-dropdown-search-margin-bottom: var(--ds-space-s);
  
  /* Options */
  --filter-dropdown-option-padding: 0.625rem 0.75rem;
  --filter-dropdown-option-gap: var(--ds-space-s);
  --filter-dropdown-option-bg: transparent;
  --filter-dropdown-option-bg-hover: var(--ds-color-surface-raised);
  --filter-dropdown-option-bg-selected: var(--ds-color-status-info-weak);
  --filter-dropdown-option-text-selected: var(--ds-color-text-info);
  --filter-dropdown-option-border-radius: var(--ds-radius-s);
  --filter-dropdown-option-transition: background-color var(--ds-duration-fast) var(--ds-ease-out);
  
  /* Checkbox/Radio */
  --filter-dropdown-check-size: 1.125rem;
  --filter-dropdown-check-border: 1px solid var(--ds-color-border);
  --filter-dropdown-check-border-hover: var(--ds-color-border-hover);
  --filter-dropdown-check-border-selected: var(--ds-color-accent);
  --filter-dropdown-check-bg: var(--ds-color-surface);
  --filter-dropdown-check-bg-selected: var(--ds-color-accent);
  --filter-dropdown-check-radius: var(--ds-radius-xs);
  --filter-dropdown-radio-radius: var(--ds-radius-circle);
  
  /* Count Badge */
  --filter-dropdown-count-bg: var(--ds-color-accent);
  --filter-dropdown-count-color: var(--ds-color-text-on-accent);
  --filter-dropdown-count-padding: 0.125rem 0.375rem;
  --filter-dropdown-count-border-radius: var(--ds-radius-pill);
  --filter-dropdown-count-font-size: var(--ds-font-size-xs);
  --filter-dropdown-count-font-weight: var(--ds-font-weight-semibold);
  --filter-dropdown-count-min-width: 1.25rem;
  
  /* Actions */
  --filter-dropdown-actions-padding: var(--ds-space-s);
  --filter-dropdown-actions-border-top: 1px solid var(--ds-color-border);
  --filter-dropdown-actions-margin-top: var(--ds-space-s);
  --filter-dropdown-actions-gap: var(--ds-space-s);
  
  /* Group Header */
  --filter-dropdown-group-header-padding: 0.5rem 0.75rem 0.25rem;
  --filter-dropdown-group-header-font-size: var(--ds-font-size-s);
  --filter-dropdown-group-header-font-weight: var(--ds-font-weight-semibold);
  --filter-dropdown-group-header-color: var(--ds-color-text-weak);
  --filter-dropdown-group-header-text-transform: uppercase;
  --filter-dropdown-group-header-letter-spacing: 0.025em;
}

/* ========================================
   Base Structure
   ======================================== */

.c-filter-dropdown {
  position: relative;
  display: inline-block;
  font-family: var(--filter-dropdown-font-family);
  font-size: var(--filter-dropdown-font-size);
  line-height: var(--filter-dropdown-line-height);
  color: var(--filter-dropdown-text-color);
}

/* ========================================
   Trigger Button
   ======================================== */

.c-filter-dropdown__trigger {
  display: inline-flex;
  align-items: center;
  gap: var(--filter-dropdown-trigger-gap);
  padding: var(--filter-dropdown-trigger-padding);
  min-height: var(--filter-dropdown-trigger-min-height);
  background: var(--filter-dropdown-trigger-bg);
  border: var(--filter-dropdown-trigger-border-width) var(--filter-dropdown-trigger-border-style) var(--filter-dropdown-trigger-border);
  border-radius: var(--filter-dropdown-trigger-border-radius);
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  cursor: pointer;
  transition: var(--filter-dropdown-trigger-transition);
  white-space: nowrap;
  user-select: none;
  outline: none;
  position: relative;
  width: 100%;
  justify-content: space-between;
}

.c-filter-dropdown__trigger:hover:not(:disabled) {
  background: var(--filter-dropdown-trigger-bg-hover);
  border-color: var(--filter-dropdown-trigger-border-hover);
}

.c-filter-dropdown__trigger:active:not(:disabled) {
  background: var(--filter-dropdown-trigger-bg-active);
}

.c-filter-dropdown__trigger:focus-visible {
  border-color: var(--ds-color-accent);
  box-shadow: 0 0 0 var(--ds-focus-ring-offset) transparent,
              0 0 0 calc(var(--ds-focus-ring-width) + var(--ds-focus-ring-offset)) var(--ds-focus-ring-color);
}

.c-filter-dropdown__trigger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.c-filter-dropdown__trigger[aria-expanded="true"] {
  background: var(--filter-dropdown-trigger-bg-hover);
  border-color: var(--ds-color-accent);
  border-style: solid;
}

/* Trigger Content */
.c-filter-dropdown__trigger-content {
  display: flex;
  align-items: center;
  gap: var(--filter-dropdown-trigger-gap);
  flex: 1;
  min-width: 0;
}

.c-filter-dropdown__trigger-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: left;
}

.c-filter-dropdown__trigger-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--filter-dropdown-count-padding);
  min-width: var(--filter-dropdown-count-min-width);
  height: 1.25rem;
  background: var(--filter-dropdown-count-bg);
  color: var(--filter-dropdown-count-color);
  border-radius: var(--filter-dropdown-count-border-radius);
  font-size: var(--filter-dropdown-count-font-size);
  font-weight: var(--filter-dropdown-count-font-weight);
  line-height: 1;
}

.c-filter-dropdown__trigger-chevron {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  color: var(--ds-color-icon);
  transition: transform var(--ds-duration-fast) var(--ds-ease-out);
  pointer-events: none;
}

.c-filter-dropdown__trigger[aria-expanded="true"] .c-filter-dropdown__trigger-chevron {
  transform: rotate(180deg);
}

/* ========================================
   Dropdown Panel
   ======================================== */

.c-filter-dropdown__panel {
  position: absolute;
  top: calc(100% + 0.25rem);
  left: 0;
  z-index: var(--filter-dropdown-panel-z-index);
  min-width: var(--filter-dropdown-panel-min-width);
  max-width: var(--filter-dropdown-panel-max-width);
  width: max-content;
  background: var(--filter-dropdown-panel-bg);
  border: var(--filter-dropdown-panel-border-width) solid var(--filter-dropdown-panel-border);
  border-radius: var(--filter-dropdown-panel-border-radius);
  box-shadow: var(--filter-dropdown-panel-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.5rem);
  transition: opacity var(--ds-duration-fast) var(--ds-ease-out),
              visibility var(--ds-duration-fast) var(--ds-ease-out),
              transform var(--ds-duration-fast) var(--ds-ease-out);
}

.c-filter-dropdown__panel[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Panel positioning variants */
.c-filter-dropdown--align-right .c-filter-dropdown__panel {
  left: auto;
  right: 0;
}

.c-filter-dropdown--align-center .c-filter-dropdown__panel {
  left: 50%;
  transform: translateX(-50%);
}

.c-filter-dropdown--align-center .c-filter-dropdown__panel[aria-hidden="false"] {
  transform: translateX(-50%) translateY(0);
}

/* Dropup variant */
.c-filter-dropdown--dropup .c-filter-dropdown__panel {
  top: auto;
  bottom: calc(100% + 0.25rem);
  transform: translateY(0.5rem);
}

.c-filter-dropdown--dropup .c-filter-dropdown__panel[aria-hidden="false"] {
  transform: translateY(0);
}

/* ========================================
   Search Section
   ======================================== */

.c-filter-dropdown__search {
  padding: var(--filter-dropdown-search-padding);
  border-bottom: var(--filter-dropdown-search-border-bottom);
  margin-bottom: var(--filter-dropdown-search-margin-bottom);
}

.c-filter-dropdown__search-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  padding-left: 2.25rem;
  background: var(--ds-color-surface);
  border: 1px solid var(--ds-color-border);
  border-radius: var(--ds-radius-s);
  font-size: var(--ds-font-size-s);
  color: var(--filter-dropdown-text-color);
  outline: none;
  transition: border-color var(--ds-duration-fast) var(--ds-ease-out);
}

.c-filter-dropdown__search-input:focus {
  border-color: var(--ds-color-accent);
  box-shadow: 0 0 0 var(--ds-focus-ring-offset) transparent,
              0 0 0 calc(var(--ds-focus-ring-width) + var(--ds-focus-ring-offset)) var(--ds-focus-ring-color);
}

.c-filter-dropdown__search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  color: var(--ds-color-icon);
  pointer-events: none;
}

.c-filter-dropdown__search-wrapper {
  position: relative;
}

/* ========================================
   Options List
   ======================================== */

.c-filter-dropdown__options {
  max-height: var(--filter-dropdown-panel-max-height);
  padding: var(--filter-dropdown-panel-padding);
  padding-top: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  list-style: none;
  margin: 0;
}

/* Scrollbar styling */
.c-filter-dropdown__options::-webkit-scrollbar {
  width: 0.5rem;
}

.c-filter-dropdown__options::-webkit-scrollbar-track {
  background: transparent;
}

.c-filter-dropdown__options::-webkit-scrollbar-thumb {
  background: var(--ds-color-border);
  border-radius: var(--ds-radius-pill);
}

.c-filter-dropdown__options::-webkit-scrollbar-thumb:hover {
  background: var(--ds-color-border-strong);
}

/* ========================================
   Option Item
   ======================================== */

.c-filter-dropdown__option {
  display: flex;
  align-items: center;
  gap: var(--filter-dropdown-option-gap);
  padding: var(--filter-dropdown-option-padding);
  background: var(--filter-dropdown-option-bg);
  border-radius: var(--filter-dropdown-option-border-radius);
  cursor: pointer;
  transition: var(--filter-dropdown-option-transition);
  user-select: none;
  position: relative;
  margin-bottom: 0.125rem;
}

.c-filter-dropdown__option:hover {
  background: var(--filter-dropdown-option-bg-hover);
}

.c-filter-dropdown__option:focus {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--ds-color-accent);
}

.c-filter-dropdown__option[aria-selected="true"] {
  background: var(--filter-dropdown-option-bg-selected);
}

.c-filter-dropdown__option[aria-selected="true"] .c-filter-dropdown__option-label {
  color: var(--filter-dropdown-option-text-selected);
  font-weight: var(--ds-font-weight-medium);
}

.c-filter-dropdown__option[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* Option Checkbox/Radio */
.c-filter-dropdown__option-checkbox,
.c-filter-dropdown__option-radio {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--filter-dropdown-check-size);
  height: var(--filter-dropdown-check-size);
  background: var(--filter-dropdown-check-bg);
  border: var(--filter-dropdown-check-border);
  transition: all var(--ds-duration-fast) var(--ds-ease-out);
  flex-shrink: 0;
}

.c-filter-dropdown__option-checkbox {
  border-radius: var(--filter-dropdown-check-radius);
}

.c-filter-dropdown__option-radio {
  border-radius: var(--filter-dropdown-radio-radius);
}

.c-filter-dropdown__option:hover .c-filter-dropdown__option-checkbox,
.c-filter-dropdown__option:hover .c-filter-dropdown__option-radio {
  border-color: var(--filter-dropdown-check-border-hover);
}

.c-filter-dropdown__option[aria-selected="true"] .c-filter-dropdown__option-checkbox,
.c-filter-dropdown__option[aria-selected="true"] .c-filter-dropdown__option-radio {
  background: var(--filter-dropdown-check-bg-selected);
  border-color: var(--filter-dropdown-check-border-selected);
}

/* Checkbox Check Mark */
.c-filter-dropdown__option-checkbox::after {
  content: '';
  position: absolute;
  width: 0.625rem;
  height: 0.375rem;
  border-left: 2px solid var(--ds-color-text-on-accent);
  border-bottom: 2px solid var(--ds-color-text-on-accent);
  transform: rotate(-45deg) translate(-1px, 1px);
  opacity: 0;
  transition: opacity var(--ds-duration-fast) var(--ds-ease-out);
}

.c-filter-dropdown__option[aria-selected="true"] .c-filter-dropdown__option-checkbox::after {
  opacity: 1;
}

/* Radio Dot */
.c-filter-dropdown__option-radio::after {
  content: '';
  position: absolute;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--ds-color-text-on-accent);
  border-radius: var(--ds-radius-circle);
  opacity: 0;
  transition: opacity var(--ds-duration-fast) var(--ds-ease-out);
}

.c-filter-dropdown__option[aria-selected="true"] .c-filter-dropdown__option-radio::after {
  opacity: 1;
}

/* Option Label */
.c-filter-dropdown__option-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: var(--ds-font-size-m);
}

/* Option Count */
.c-filter-dropdown__option-count {
  margin-left: auto;
  padding: 0.125rem 0.375rem;
  background: var(--ds-color-surface-raised);
  color: var(--ds-color-text-weak);
  border-radius: var(--ds-radius-pill);
  font-size: var(--ds-font-size-xs);
  font-weight: var(--ds-font-weight-medium);
  line-height: 1;
}

/* ========================================
   Group Header
   ======================================== */

.c-filter-dropdown__group {
  margin-bottom: var(--ds-space-m);
}

.c-filter-dropdown__group:last-child {
  margin-bottom: 0;
}

.c-filter-dropdown__group-header {
  padding: var(--filter-dropdown-group-header-padding);
  font-size: var(--filter-dropdown-group-header-font-size);
  font-weight: var(--filter-dropdown-group-header-font-weight);
  color: var(--filter-dropdown-group-header-color);
  text-transform: var(--filter-dropdown-group-header-text-transform);
  letter-spacing: var(--filter-dropdown-group-header-letter-spacing);
  user-select: none;
}

/* ========================================
   Actions Footer
   ======================================== */

.c-filter-dropdown__actions {
  display: flex;
  gap: var(--filter-dropdown-actions-gap);
  padding: var(--filter-dropdown-actions-padding);
  border-top: var(--filter-dropdown-actions-border-top);
  margin-top: var(--filter-dropdown-actions-margin-top);
}

.c-filter-dropdown__action-button {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: 1px solid var(--ds-color-border);
  border-radius: var(--ds-radius-s);
  font-size: var(--ds-font-size-s);
  font-weight: var(--ds-font-weight-medium);
  color: var(--filter-dropdown-text-color);
  cursor: pointer;
  transition: all var(--ds-duration-fast) var(--ds-ease-out);
  outline: none;
  white-space: nowrap;
  user-select: none;
}

.c-filter-dropdown__action-button:hover {
  background: var(--ds-color-surface-raised);
  border-color: var(--ds-color-border-hover);
}

.c-filter-dropdown__action-button:focus-visible {
  border-color: var(--ds-color-accent);
  box-shadow: 0 0 0 var(--ds-focus-ring-offset) transparent,
              0 0 0 calc(var(--ds-focus-ring-width) + var(--ds-focus-ring-offset)) var(--ds-focus-ring-color);
}

.c-filter-dropdown__action-button--primary {
  background: var(--ds-color-accent);
  border-color: var(--ds-color-accent);
  color: var(--ds-color-text-on-accent);
}

.c-filter-dropdown__action-button--primary:hover {
  background: var(--ds-color-accent-secondary);
  border-color: var(--ds-color-accent-secondary);
}

/* ========================================
   Empty State
   ======================================== */

.c-filter-dropdown__empty {
  padding: var(--ds-space-l) var(--ds-space-m);
  text-align: center;
  color: var(--ds-color-text-weak);
  font-size: var(--ds-font-size-s);
}

/* ========================================
   Loading State
   ======================================== */

.c-filter-dropdown__loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--ds-space-l);
  color: var(--ds-color-text-weak);
}

.c-filter-dropdown__loading-spinner {
  width: 1.5rem;
  height: 1.5rem;
  animation: filter-dropdown-spin 1s linear infinite;
  color: var(--ds-color-accent);
}

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

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

/* Small */
.c-filter-dropdown--small {
  --filter-dropdown-font-size: var(--ds-font-size-s);
  --filter-dropdown-trigger-padding: 0.5rem 0.75rem;
  --filter-dropdown-trigger-min-height: 2.25rem;
  --filter-dropdown-panel-min-width: 240px;
}

/* Large */
.c-filter-dropdown--large {
  --filter-dropdown-font-size: var(--ds-font-size-l);
  --filter-dropdown-trigger-padding: 1rem 1.25rem;
  --filter-dropdown-trigger-min-height: 3.25rem;
  --filter-dropdown-panel-min-width: 320px;
}

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

.c-filter-dropdown--full-width {
  width: 100%;
}

.c-filter-dropdown--full-width .c-filter-dropdown__trigger {
  width: 100%;
}

.c-filter-dropdown--full-width .c-filter-dropdown__panel {
  min-width: 100%;
}

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

/* Solid Style */
.c-filter-dropdown--solid .c-filter-dropdown__trigger {
  --filter-dropdown-trigger-border-style: solid;
  --filter-dropdown-trigger-bg: var(--ds-color-surface-raised);
}

/* Ghost Style */
.c-filter-dropdown--ghost .c-filter-dropdown__trigger {
  --filter-dropdown-trigger-bg: transparent;
  --filter-dropdown-trigger-border: transparent;
}

.c-filter-dropdown--ghost .c-filter-dropdown__trigger:hover:not(:disabled) {
  --filter-dropdown-trigger-bg: var(--ds-color-surface-raised);
}

/* ========================================
   High Contrast Mode
   ======================================== */

@media (prefers-contrast: high) {
  .c-filter-dropdown__trigger {
    border-width: 2px;
  }
  
  .c-filter-dropdown__panel {
    border-width: 2px;
  }
  
  .c-filter-dropdown__option[aria-selected="true"] {
    outline: 2px solid;
    outline-offset: -2px;
  }
}

/* ========================================
   Reduced Motion
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  .c-filter-dropdown__trigger,
  .c-filter-dropdown__panel,
  .c-filter-dropdown__trigger-chevron,
  .c-filter-dropdown__option,
  .c-filter-dropdown__option-checkbox::after,
  .c-filter-dropdown__option-radio::after,
  .c-filter-dropdown__loading-spinner {
    transition: none;
    animation: none;
  }
}

/* ========================================
   Mobile Responsive
   ======================================== */

@media (max-width: 640px) {
  .c-filter-dropdown__panel {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-width: none;
    border-radius: var(--ds-radius-m) var(--ds-radius-m) 0 0;
    transform: translateY(100%);
    z-index: 9999;
  }
  
  .c-filter-dropdown__panel[aria-hidden="false"] {
    transform: translateY(0);
  }
  
  .c-filter-dropdown__panel::before {
    content: '';
    position: absolute;
    top: 0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 2.5rem;
    height: 0.25rem;
    background: var(--ds-color-border);
    border-radius: var(--ds-radius-pill);
  }
  
  .c-filter-dropdown--mobile-overlay::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--ds-duration-medium) var(--ds-ease-out);
  }
  
  .c-filter-dropdown--open.c-filter-dropdown--mobile-overlay::before {
    opacity: 1;
    visibility: visible;
  }
}