/**
 * List Component
Full accessibility support
 * Displays a collection of items in a structured format
 */

/* ========================================
   LIST CUSTOM PROPERTIES
   ======================================== */

.c-list {
  /* Base properties */
  --c-list-background: transparent;
  --c-list-border-color: var(--ds-color-border);
  --c-list-border-radius: var(--ds-radius-s);
  --c-list-padding: 0;
  --c-list-gap: 0;
  
  /* List item */
  --c-list-item-padding: var(--ds-space-m);
  --c-list-item-background: transparent;
  --c-list-item-background-hover: var(--ds-color-surface-hover);
  --c-list-item-background-active: var(--ds-color-surface-active);
  --c-list-item-background-selected: var(--ds-color-primary-weak);
  --c-list-item-border-color: var(--ds-color-border-weak);
  --c-list-item-text-color: var(--ds-color-text);
  --c-list-item-text-color-weak: var(--ds-color-text-weak);
  --c-list-item-min-height: 2.5rem;
  
  /* Transitions */
  --c-list-transition: background-color var(--ds-duration-fast) var(--ds-ease-out),
                       border-color var(--ds-duration-fast) var(--ds-ease-out);
}

/* ========================================
   BASE LIST STYLES
   ======================================== */

.c-list {
  display: flex;
  flex-direction: column;
  background: var(--c-list-background);
  border-radius: var(--c-list-border-radius);
  padding: var(--c-list-padding);
  gap: var(--c-list-gap);
  list-style: none;
  margin: 0;
}

/* List item */
.c-list-item {
  display: flex;
  align-items: center;
  min-height: var(--c-list-item-min-height);
  padding: var(--c-list-item-padding);
  background: var(--c-list-item-background);
  color: var(--c-list-item-text-color);
  border-bottom: 1px solid var(--c-list-item-border-color);
  transition: var(--c-list-transition);
  position: relative;
  text-decoration: none;
  cursor: default;
}

.c-list-item:last-child {
  border-bottom: none;
}

/* Interactive list items */
.c-list-item--interactive {
  cursor: pointer;
}

.c-list-item--interactive:hover {
  background: var(--c-list-item-background-hover);
}

.c-list-item--interactive:active {
  background: var(--c-list-item-background-active);
}

.c-list-item--interactive:focus {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--ds-color-border-focus);
}

/* Selected state */
.c-list-item--selected {
  background: var(--c-list-item-background-selected);
}

/* Disabled state */
.c-list-item--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* List item content */
.c-list-item__content {
  display: flex;
  align-items: center;
  gap: var(--ds-space-s);
  flex: 1;
  min-width: 0;
}

.c-list-item__start {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.c-list-item__main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--ds-space-xs);
}

.c-list-item__end {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--ds-space-xs);
}

.c-list-item__title {
  font-size: var(--ds-font-size-m);
  font-weight: var(--ds-font-weight-normal);
  color: var(--c-list-item-text-color);
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.c-list-item__subtitle {
  font-size: var(--ds-font-size-s);
  color: var(--c-list-item-text-color-weak);
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.c-list-item__description {
  font-size: var(--ds-font-size-s);
  color: var(--c-list-item-text-color-weak);
  margin: 0;
  line-height: var(--ds-line-height-s);
}

.c-list-item__icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--c-list-item-text-color-weak);
}

.c-list-item__avatar {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--ds-color-surface-weak);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--ds-font-size-s);
  font-weight: var(--ds-font-weight-semibold);
}

/* ========================================
   SIZE VARIANTS
   ======================================== */

/* Small list */
.c-list--size-s {
  --c-list-item-padding: var(--ds-space-s);
  --c-list-item-min-height: 2rem;
}

.c-list--size-s .c-list-item__title {
  font-size: var(--ds-font-size-s);
}

.c-list--size-s .c-list-item__subtitle,
.c-list--size-s .c-list-item__description {
  font-size: var(--ds-font-size-xs);
}

.c-list--size-s .c-list-item__icon {
  width: 1rem;
  height: 1rem;
}

.c-list--size-s .c-list-item__avatar {
  width: 1.5rem;
  height: 1.5rem;
  font-size: var(--ds-font-size-xs);
}

/* Large list */
.c-list--size-l {
  --c-list-item-padding: var(--ds-space-l);
  --c-list-item-min-height: 3.5rem;
}

.c-list--size-l .c-list-item__title {
  font-size: var(--ds-font-size-l);
}

.c-list--size-l .c-list-item__subtitle,
.c-list--size-l .c-list-item__description {
  font-size: var(--ds-font-size-m);
}

.c-list--size-l .c-list-item__icon {
  width: 1.5rem;
  height: 1.5rem;
}

.c-list--size-l .c-list-item__avatar {
  width: 2.5rem;
  height: 2.5rem;
  font-size: var(--ds-font-size-m);
}

/* ========================================
   STYLE VARIANTS
   ======================================== */

/* Bordered list */
.c-list--bordered {
  border: 1px solid var(--c-list-border-color);
}

/* Divided list */
.c-list--divided .c-list-item {
  border-bottom: 1px solid var(--c-list-item-border-color);
}

.c-list--divided .c-list-item:last-child {
  border-bottom: 1px solid var(--c-list-item-border-color);
}

/* Spaced list */
.c-list--spaced {
  --c-list-gap: var(--ds-space-xs);
}

.c-list--spaced .c-list-item {
  border: 1px solid var(--c-list-item-border-color);
  border-radius: var(--ds-radius-s);
}

/* Flush list (no padding) */
.c-list--flush .c-list-item {
  --c-list-item-padding: 0;
}

/* ========================================
   LAYOUT VARIANTS
   ======================================== */

/* Horizontal list */
.c-list--horizontal {
  flex-direction: row;
  flex-wrap: wrap;
}

.c-list--horizontal .c-list-item {
  border-bottom: none;
  border-right: 1px solid var(--c-list-item-border-color);
}

.c-list--horizontal .c-list-item:last-child {
  border-right: none;
}

/* Grid list */
.c-list--grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--ds-space-s);
}

.c-list--grid .c-list-item {
  border: 1px solid var(--c-list-item-border-color);
  border-radius: var(--ds-radius-s);
}

/* ========================================
   SPECIAL LIST TYPES
   ======================================== */

/* Menu list */
.c-list--menu {
  --c-list-item-padding: var(--ds-space-s) var(--ds-space-m);
  --c-list-item-min-height: 2.25rem;
  border: 1px solid var(--c-list-border-color);
  box-shadow: var(--ds-shadow-m);
  background: var(--ds-color-surface);
}

.c-list--menu .c-list-item {
  border-bottom: none;
}

.c-list--menu .c-list-item--interactive:hover {
  background: var(--ds-color-surface-hover);
}

/* Navigation list */
.c-list--nav .c-list-item {
  --c-list-item-padding: var(--ds-space-s) var(--ds-space-m);
  border-bottom: none;
  border-radius: var(--ds-radius-s);
  margin-bottom: var(--ds-space-xs);
}

.c-list--nav .c-list-item:last-child {
  margin-bottom: 0;
}

.c-list--nav .c-list-item--active {
  background: var(--c-list-item-background-selected);
  font-weight: var(--ds-font-weight-semibold);
}

/* ========================================
   LIST GROUPS
   ======================================== */

.c-list-group {
  display: flex;
  flex-direction: column;
  gap: var(--ds-space-m);
}

.c-list-group__header {
  padding: var(--ds-space-s) var(--ds-space-m);
  font-size: var(--ds-font-size-s);
  font-weight: var(--ds-font-weight-semibold);
  color: var(--ds-color-text-weak);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--ds-color-border-weak);
  margin-bottom: var(--ds-space-s);
}

.c-list-group__content {
  flex: 1;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
  .c-list--horizontal {
    flex-direction: column;
  }
  
  .c-list--horizontal .c-list-item {
    border-right: none;
    border-bottom: 1px solid var(--c-list-item-border-color);
  }
  
  .c-list--horizontal .c-list-item:last-child {
    border-bottom: none;
  }
  
  .c-list--grid {
    grid-template-columns: 1fr;
  }
  
  .c-list-item__main {
    gap: var(--ds-space-xs);
  }
  
  .c-list-item__title,
  .c-list-item__subtitle,
  .c-list-item__description {
    white-space: normal;
    overflow: visible;
    text-overflow: initial;
  }
}

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

/* Focus management */
.c-list:focus-within {
  outline: none;
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .c-list-item {
    border-bottom-width: 2px;
  }
  
  .c-list--bordered {
    border-width: 2px;
  }
  
  .c-list--spaced .c-list-item {
    border-width: 2px;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .c-list,
  .c-list *,
  .c-list *::before,
  .c-list *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  .c-list {
    background: transparent !important;
    box-shadow: none !important;
  }
  
  .c-list-item {
    background: transparent !important;
    border-color: #000 !important;
    color: #000 !important;
  }
  
  .c-list-item__title {
    color: #000 !important;
  }
  
  .c-list-item__subtitle,
  .c-list-item__description {
    color: #666 !important;
  }
}

/* ========================================
   UTILITIES
   ======================================== */

/* Loading state */
.c-list--loading {
  position: relative;
  overflow: hidden;
}

.c-list--loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--ds-color-primary),
    transparent
  );
  animation: list-loading 1.5s infinite;
}

@keyframes list-loading {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* Empty state */
.c-list--empty {
  padding: var(--ds-space-xl);
  text-align: center;
  color: var(--ds-color-text-weak);
}

.c-list--empty::before {
  content: '';
  display: block;
  width: 3rem;
  height: 3rem;
  margin: 0 auto var(--ds-space-m);
  background: var(--ds-color-surface-weak);
  border-radius: 50%;
}