/**
 * Trail Algorithm List Styles
 *
 * Clean list-based algorithm selection UI
 * Design inspired by llm-segmented-control for consistent look & feel
 *
 * @since 1.0.0
 * @see execute-section.css (llm-segmented-control)
 */

/* ========================================
   Trail Algorithm Section Container
   ======================================== */

.trail-algorithm-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

/* ========================================
   Section Header with Search
   ======================================== */

.trail-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  gap: 20px;
}

.trail-section-title {
  font-family: var(--font-system);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
  white-space: nowrap;
}

/* Search Input Wrapper */
.trail-search-wrapper {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.trail-search-input {
  width: 100%;
  height: 40px;
  padding: 8px 40px 8px 16px;
  font-family: var(--font-system);
  font-size: 14px;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  border: 1.5px solid var(--color-border-light);
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  outline: none;
}

.trail-search-input:hover {
  border-color: var(--color-primary);
  box-shadow: 0 2px 4px rgba(0, 59, 113, 0.1);
}

.trail-search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 59, 113, 0.1);
}

.trail-search-input::placeholder {
  color: var(--color-neutral-500);
  opacity: 0.7;
}

/* Search Icon */
.trail-search-icon {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-neutral-500);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

.trail-search-icon svg {
  width: 16px;
  height: 16px;
}

/* ========================================
   Algorithm List Container (Scrollable)
   ======================================== */

.trail-algorithm-list-container {
  /* iOS-style segmented control background */
  background-color: var(--color-bg-hover);
  border-radius: 8px;
  padding: 8px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.08);

  /* Scrollable with max height */
  max-height: 500px;
  overflow-y: auto;

  /* Custom scrollbar styling */
  scrollbar-width: thin;
  scrollbar-color: var(--color-neutral-400) var(--color-bg-hover);
}

/* Webkit browsers scrollbar */
.trail-algorithm-list-container::-webkit-scrollbar {
  width: 8px;
}

.trail-algorithm-list-container::-webkit-scrollbar-track {
  background: var(--color-bg-hover);
  border-radius: 8px;
}

.trail-algorithm-list-container::-webkit-scrollbar-thumb {
  background: var(--color-neutral-400);
  border-radius: 8px;
  transition: background 0.3s ease;
}

.trail-algorithm-list-container::-webkit-scrollbar-thumb:hover {
  background: var(--color-neutral-500);
}

/* ========================================
   Algorithm List Items
   ======================================== */

.trail-algorithm-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Individual Algorithm Item */
.trail-algorithm-item {
  display: flex;
  align-items: center;
  padding: 12px 16px;

  /* Typography */
  font-family: var(--font-system);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);

  /* Appearance */
  background-color: transparent;
  border-radius: 6px;
  cursor: pointer;
  user-select: none;

  /* Smooth transitions (same as llm-segmented-control) */
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  margin: 0;
  position: relative;
}

/* Hide checkbox input */
.trail-algo-checkbox {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

/* Algorithm name text */
.trail-algorithm-name {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

/* Hover state (unselected items) */
.trail-algorithm-item:hover {
  background-color: rgba(0, 59, 113, 0.05);
  color: var(--color-primary-hover);
}

/* Selected state (matching llm-segmented-control) */
.trail-algorithm-item.selected,
.trail-algo-checkbox:checked + .trail-algorithm-name {
  background-color: var(--color-primary);
  color: white;
  box-shadow: 0 2px 4px rgba(0, 59, 113, 0.2),
              0 1px 2px rgba(0, 59, 113, 0.1);
}

/* Selected item - apply to parent */
.trail-algorithm-item:has(.trail-algo-checkbox:checked) {
  background-color: var(--color-primary);
  color: white;
  box-shadow: 0 2px 4px rgba(0, 59, 113, 0.2),
              0 1px 2px rgba(0, 59, 113, 0.1);
}

/* Active state (when clicking) */
.trail-algorithm-item:active {
  transform: scale(0.98);
}

/* Focus state for accessibility */
.trail-algo-checkbox:focus + .trail-algorithm-name {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ========================================
   Selection Indicator (Optional)
   ======================================== */

/* Add checkmark icon to selected items */
.trail-algorithm-item.selected .trail-algorithm-name::before,
.trail-algorithm-item:has(.trail-algo-checkbox:checked) .trail-algorithm-name::before {
  content: '✓';
  margin-right: 8px;
  font-weight: bold;
  font-size: 16px;
}

/* ========================================
   Loading & Empty States
   ======================================== */

.trail-algorithm-loading,
.trail-algorithm-empty {
  text-align: center;
  padding: 32px 16px;
  font-family: var(--font-system);
  font-size: 14px;
  color: var(--color-neutral-500);
}

.trail-algorithm-loading {
  color: var(--color-primary);
}

/* Hide items when searching (no match) */
.trail-algorithm-item[style*="display: none"] {
  display: none !important;
}

/* ========================================
   Responsive Design
   ======================================== */

@media screen and (max-width: 768px) {
  .trail-algorithm-section {
    padding: 16px;
  }

  .trail-section-header {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .trail-search-wrapper {
    max-width: 100%;
  }

  .trail-algorithm-list-container {
    max-height: 400px;
  }

  .trail-algorithm-item {
    padding: 10px 12px;
    font-size: 13px;
  }
}

/* ========================================
   Animation Enhancements
   ======================================== */

/* Fade in animation for loaded items */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.trail-algorithm-item {
  animation: fadeInUp 0.3s ease-out;
  animation-fill-mode: both;
}

/* Staggered animation for multiple items */
.trail-algorithm-item:nth-child(1) { animation-delay: 0.05s; }
.trail-algorithm-item:nth-child(2) { animation-delay: 0.1s; }
.trail-algorithm-item:nth-child(3) { animation-delay: 0.15s; }
.trail-algorithm-item:nth-child(4) { animation-delay: 0.2s; }
.trail-algorithm-item:nth-child(5) { animation-delay: 0.25s; }

/* After 5th item, no delay */
.trail-algorithm-item:nth-child(n+6) { animation-delay: 0s; }