/**
 * Topic Browse Panel Styling
 */

.topic-browse-panel-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.3s ease;
    padding: 1rem;
}

.topic-browse-panel-overlay.visible {
    opacity: 1;
}

.topic-browse-panel {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    display: flex;
    flex-direction: column;
    max-width: 900px;
    width: 100%;
    max-height: 85vh;
    animation: slideUp 0.3s ease forwards;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Header */
.topic-browse-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid #e0e0e0;
}

.topic-browse-header h2 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
}

.topic-browse-close {
    background: none;
    border: none;
    cursor: pointer;
    color: #999;
    padding: 0.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background-color 0.2s, color 0.2s;
}

.topic-browse-close:hover {
    background-color: #f0f0f0;
    color: #333;
}

/* Categories */
.topic-browse-categories {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    flex-wrap: wrap;
    border-bottom: 1px solid #e0e0e0;
    flex-shrink: 0;
}

.topic-browse-category-btn {
    padding: 0.35rem 0.85rem;
    border: 1px solid #ddd;
    background: white;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
    color: #666;
}

.topic-browse-category-btn:hover {
    border-color: #4CAF50;
    color: #4CAF50;
}

.topic-browse-category-btn.active {
    background: #4CAF50;
    color: white;
    border-color: #4CAF50;
}

/* Grid */
.topic-browse-grid {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1.25rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
    align-content: start;
}

/* Compact Card Styling */
.topic-browse-item {
    padding: 0.65rem 0.85rem;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
    background: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 48px;
    box-sizing: border-box;
}

.topic-browse-item:hover {
    border-color: #4CAF50;
    box-shadow: 0 3px 10px rgba(76, 175, 80, 0.15);
    background-color: #fbfdfb;
}

.topic-browse-item-name {
    font-weight: 600;
    font-size: 0.9rem;
    line-height: 1.3;
    color: #333;
    margin: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    word-break: break-word;
}

/* Type and Description hidden by default everywhere */
.topic-browse-item-type,
.topic-browse-item-description {
    display: none;
}

/* Desktop hover / focus-within reveal for description (in-flow expansion) */
@media (min-width: 769px) and (hover: hover) and (pointer: fine) {
    .topic-browse-item:hover .topic-browse-item-description,
    .topic-browse-item:focus-within .topic-browse-item-description {
        display: -webkit-box;
        -webkit-line-clamp: 3;
        line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
        text-overflow: ellipsis;
        margin-top: 0.35rem;
        font-size: 0.8rem;
        color: #666;
        line-height: 1.35;
        word-break: break-word;
    }
}

.topic-browse-loading,
.topic-browse-empty,
.topic-browse-error {
    grid-column: 1 / -1;
    padding: 2rem;
    text-align: center;
    font-size: 0.95rem;
}

.topic-browse-loading { color: #999; }
.topic-browse-empty { color: #999; }
.topic-browse-error { color: #d32f2f; }

/* Pagination */
.topic-browse-pagination {
    padding: 0.75rem 1.25rem;
    border-top: 1px solid #e0e0e0;
    flex-shrink: 0;
}

.topic-browse-pagination-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.topic-browse-pagination-btn {
    padding: 0.4rem 0.85rem;
    border: 1px solid #ddd;
    background: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s;
    color: #333;
}

.topic-browse-pagination-btn:hover:not(:disabled) {
    border-color: #4CAF50;
    color: #4CAF50;
}

.topic-browse-pagination-btn:disabled {
    color: #ccc;
    cursor: not-allowed;
}

.topic-browse-pagination-info {
    color: #666;
    font-size: 0.85rem;
    font-weight: 500;
}

/* Footer */
.topic-browse-footer {
    padding: 0.75rem 1.25rem;
    border-top: 1px solid #e0e0e0;
    text-align: right;
    flex-shrink: 0;
}

.topic-browse-cancel-btn {
    padding: 0.5rem 1.25rem;
    border: 1px solid #ddd;
    background: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    color: #666;
}

.topic-browse-cancel-btn:hover {
    border-color: #d32f2f;
    color: #d32f2f;
}

/* Responsive */
@media (max-width: 768px) {
    .topic-browse-panel-overlay {
        padding: 0.5rem;
    }

    .topic-browse-panel {
        max-width: 100%;
        max-height: 92vh;
        border-radius: 12px 12px 0 0;
        margin-top: auto;
    }

    .topic-browse-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
        gap: 0.5rem;
        padding: 0.75rem;
    }

    .topic-browse-header {
        padding: 0.75rem 1rem;
    }

    .topic-browse-header h2 {
        font-size: 1.15rem;
    }

    .topic-browse-categories {
        gap: 0.35rem;
        padding: 0.5rem 1rem;
    }

    .topic-browse-category-btn {
        padding: 0.3rem 0.65rem;
        font-size: 0.8rem;
    }

    /* Force description to stay hidden on mobile even on hover */
    .topic-browse-item-description {
        display: none !important;
    }

    .topic-browse-pagination {
        padding: 0.5rem 1rem;
    }

    .topic-browse-footer {
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 480px) {
    .topic-browse-panel-overlay {
        padding: 0.25rem 0.25rem 0 0.25rem;
    }

    .topic-browse-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
        padding: 0.5rem;
    }

    .topic-browse-item {
        padding: 0.5rem 0.6rem;
        min-height: 44px;
    }

    .topic-browse-item-name {
        font-size: 0.825rem;
        line-height: 1.25;
    }

    .topic-browse-header {
        padding: 0.6rem 0.75rem;
    }

    .topic-browse-search-section {
        padding: 0.5rem 0.75rem;
    }

    .topic-browse-categories {
        padding: 0.35rem 0.75rem;
        gap: 0.25rem;
    }

    .topic-browse-category-btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.775rem;
    }

    .topic-browse-pagination {
        padding: 0.4rem 0.75rem;
    }

    .topic-browse-footer {
        padding: 0.4rem 0.75rem;
    }

    .topic-browse-cancel-btn {
        padding: 0.35rem 1rem;
        font-size: 0.825rem;
    }
}