/* =================================================================
   DECK BUILDER - LESSON ORGANIZER STYLES
   Split-panel UI for reordering and moving words between lessons.
   Matches the Deck Builder / Word Card Data Editor visual style.
   ================================================================= */

/* Controls Bar - matches .deck-controls pattern */
.lo-controls {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
    padding: 6px 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-bottom: 12px;
}

.lo-controls .select-control {
    min-width: auto;
    padding: 5px 8px;
    font-size: 13px;
}

.lo-controls .btn {
    padding: 5px 10px;
    font-size: 13px;
}

.lo-unsaved-area {
    margin-left: auto;
}

/* Panels Container */
.lo-panels {
    display: flex;
    gap: 0;
    min-height: 200px;
}

.lo-panels.lo-split {
    gap: 16px;
}

/* Single Panel */
.lo-panel {
    flex: 1;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

[data-theme="dark"] .lo-panel {
    background: var(--bg-primary);
}

/* Panel Header - matches deck-table th style */
.lo-panel-header {
    background: #34495e;
    color: white;
    padding: 10px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
}

[data-theme="dark"] .lo-panel-header {
    background: var(--bg-secondary);
    border-bottom: 2px solid var(--border-color);
}

.lo-panel-header h4 {
    margin: 0;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.lo-card-count {
    font-size: 12px;
    opacity: 0.85;
    font-weight: 400;
}

.lo-target-header-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lo-target-header-row .select-control {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 13px;
}

[data-theme="dark"] .lo-target-header-row .select-control {
    background: var(--bg-primary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.lo-target-header-row .select-control option {
    background: var(--bg-primary, white);
    color: var(--text-primary, #333);
}

.lo-target-header-row .btn {
    padding: 3px 8px;
    font-size: 12px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
}

[data-theme="dark"] .lo-target-header-row .btn {
    background: var(--bg-primary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.lo-target-header-row .btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Card List - multi-column scrollable area */
.lo-card-list {
    flex: 1;
    overflow-y: auto;
    max-height: calc(100vh - 280px);
    padding: 4px 0;
    column-count: var(--lo-columns, 1);
    column-gap: 0;
    column-rule: 1px solid var(--border-color, #ddd);
    scrollbar-width: auto;
    scrollbar-color: #888 #f1f1f1;
}

[data-theme="dark"] .lo-card-list {
    scrollbar-color: #666 var(--bg-secondary);
}

.lo-card-list::-webkit-scrollbar {
    width: 10px;
}

.lo-card-list::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.lo-card-list::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

[data-theme="dark"] .lo-card-list::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

[data-theme="dark"] .lo-card-list::-webkit-scrollbar-thumb {
    background: #666;
}

/* Column Header Row */
.lo-column-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary, #666);
    background: var(--bg-secondary, #f5f5f5);
    border-bottom: 2px solid var(--border-color, #ddd);
    break-inside: avoid;
    break-after: avoid;
}

.lo-column-header .lo-hdr-num {
    min-width: 32px;
    padding-left: 26px; /* align with card # past drag handle */
}

.lo-column-header .lo-hdr-word {
    min-width: 100px;
}

.lo-column-header .lo-hdr-english {
    flex: 1;
}

/* Card Item - matches deck-table td row style */
.lo-card-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-bottom: 1px solid #ddd;
    font-size: 13px;
    background: white;
    transition: background 0.15s;
    break-inside: avoid;
}

[data-theme="dark"] .lo-card-item {
    background: var(--bg-primary);
    border-bottom-color: var(--border-color);
}

.lo-card-item:hover {
    background: #f8f9fa;
}

[data-theme="dark"] .lo-card-item:hover {
    background: var(--bg-secondary);
}

.lo-card-item:last-child {
    border-bottom: none;
}

/* Drag Handle */
.lo-drag-handle {
    cursor: grab;
    color: var(--text-secondary);
    padding: 2px 4px;
    font-size: 14px;
    opacity: 0.5;
    transition: opacity 0.2s;
}

.lo-drag-handle:hover {
    opacity: 1;
    color: var(--primary);
}

.lo-drag-handle:active {
    cursor: grabbing;
}

/* Checkbox */
.lo-card-checkbox {
    cursor: pointer;
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
    flex-shrink: 0;
}

/* Card Number */
.lo-card-num {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 36px;
    font-size: 12px;
}

/* Card Word */
.lo-card-word {
    font-weight: 600;
    color: var(--text-primary);
    min-width: 100px;
}

/* Card English */
.lo-card-english {
    color: var(--text-secondary);
    font-size: 12px;
}

/* SortableJS Ghost/Chosen States */
.lo-ghost {
    opacity: 0.4;
    background: rgba(79, 70, 229, 0.1);
    border: 1px dashed var(--primary);
}

.lo-chosen {
    background: rgba(79, 70, 229, 0.05);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Empty State */
.lo-empty {
    padding: 32px 16px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* Transfer Bar */
.lo-transfer-bar {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin-top: 12px;
}

/* Action Bar */
.lo-action-bar {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Tablet / Mobile Responsive
   ============================================ */
@media (max-width: 768px) {
    .lo-panels.lo-split {
        flex-direction: column;
    }

    .lo-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .lo-controls .filter-group {
        width: 100%;
    }

    .lo-unsaved-area {
        margin-left: 0;
        text-align: right;
    }

    .lo-transfer-bar {
        flex-direction: column;
    }

    .lo-card-english,
    .lo-column-header .lo-hdr-english {
        display: none;
    }

    .lo-card-list {
        --lo-columns: 1 !important;
    }
}