/* Thread Tree View Styles */

.thread-tree {
    font-family: var(--bs-font-sans-serif);
    font-size: 14px;
    margin: 20px 0;
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius-lg);
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    padding: 20px;
    box-shadow: var(--bs-box-shadow);
}

.thread-tree-container {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
}

.tree-stats {
    background-color: var(--bs-secondary-bg);
    padding: 8px 12px;
    border-radius: var(--bs-border-radius);
    margin-bottom: 15px;
    font-size: 12px;
    color: var(--bs-secondary-color);
}

.tree-stats span {
    margin-right: 15px;
}

.tree-root, .tree-children {
    list-style: none;
    padding: 0;
    margin: 0;
}

.tree-children {
    margin-left: 25px;
    border-left: 2px solid var(--bs-border-color);
    padding-left: 20px;
    position: relative;
}

.tree-children::before {
    content: '';
    position: absolute;
    left: -2px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--bs-primary) 0%, var(--bs-secondary) 100%);
    opacity: 0.3;
}

.tree-node {
    margin: 6px 0;
    position: relative;
    transition: all 0.2s ease;
    color: var(--bs-body-color);
    background-color: transparent;
}

.tree-node:hover {
    transform: translateX(2px);
}

.tree-node.expandable > .node-content .node-toggle {
    cursor: pointer;
    font-weight: bold;
    margin-right: 5px;
    color: var(--bs-primary);
    font-family: var(--bs-font-monospace);
}

.tree-node.expandable > .node-content .node-toggle:hover {
    background-color: var(--bs-primary-bg-subtle);
    border-radius: var(--bs-border-radius-sm);
}

.node-content {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: var(--bs-border-radius);
    transition: all 0.3s ease;
    background-color: var(--bs-body-bg);
    border: 1px solid transparent;
    cursor: pointer;
}

.node-content:hover {
    background-color: var(--bs-secondary-bg);
    border-color: var(--bs-primary);
    box-shadow: 0 2px 8px var(--bs-primary-bg-subtle);
}

.tree-node-content {
    background-color: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    color: var(--bs-body-color);
    margin: 2px 0;
    padding: 8px;
    border-radius: var(--bs-border-radius);
}

.tree-node-content:hover {
    background-color: var(--bs-secondary-bg);
}

.tree-node a {
    color: var(--bs-link-color);
    text-decoration: none;
}

.tree-node a:hover {
    color: var(--bs-link-hover-color);
    text-decoration: underline;
}

.node-toggle {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--bs-border-radius);
    background-color: var(--bs-tertiary-bg);
    border: 1px solid var(--bs-border-color);
    font-family: var(--bs-font-monospace);
    font-size: 12px;
    color: var(--bs-body-color);
    transition: all 0.2s ease;
}

.node-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
    flex: 1;
    gap: 12px;
    cursor: pointer;
}

.node-link:hover {
    text-decoration: underline;
}

.node-subject {
    font-weight: 600;
    color: var(--bs-body-color);
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 14px;
}

.node-author {
    color: var(--bs-secondary-color);
    font-size: 12px;
    min-width: 120px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

.node-date {
    color: var(--bs-tertiary-color);
    font-size: 11px;
    font-family: var(--bs-font-monospace);
    min-width: 100px;
    text-align: right;
    font-weight: 400;
}

/* Depth-based enhanced styling */
.tree-node[data-depth="0"] {
    border-left: 4px solid var(--bs-primary);
    padding-left: 8px;
}

.tree-node[data-depth="0"] .node-subject {
    font-weight: bold;
    color: var(--bs-primary);
    font-size: 15px;
}

.tree-node[data-depth="1"] .node-content {
    background-color: var(--bs-primary-bg-subtle);
}

.tree-node[data-depth="2"] .node-content {
    background-color: var(--bs-secondary-bg-subtle);
}

.tree-node[data-depth="3"] .node-content {
    background-color: var(--bs-tertiary-bg-subtle);
}

/* Collapsed state */
.tree-node.collapsed > .tree-children {
    display: none;
}

.tree-node.collapsed > .tree-details > .tree-children {
    display: none;
}

/* When JavaScript is enabled, override details behavior for collapsed nodes */
.js-enabled .tree-node.collapsed > .tree-details[open] > .tree-children {
    display: none !important;
}

/* Toggle symbols */
.tree-node.expandable.collapsed > .node-content .node-toggle::before {
    content: "[+]";
}

.tree-node.expandable.expanded > .node-content .node-toggle::before {
    content: "[-]";
}

.tree-node.expandable > .node-content .node-toggle::before {
    content: "[-]"; /* Default to expanded */
}

/* Non-expandable nodes should not show toggle symbols */
.tree-node:not(.expandable) .node-toggle::before {
    content: "";
}

/* Error states */
.tree-error {
    background-color: var(--bs-danger-bg-subtle);
    border: 1px solid var(--bs-danger-border-subtle);
    padding: 15px;
    border-radius: var(--bs-border-radius);
    color: var(--bs-danger-text-emphasis);
    text-align: center;
}

/* Action buttons styling */
.node-actions {
    display: flex;
    gap: 6px;
    align-items: center;
    margin-left: 8px;
}

.btn-view, .btn-preview {
    background: none;
    border: none;
    padding: 4px 6px;
    border-radius: var(--bs-border-radius);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    text-decoration: none;
    color: var(--bs-secondary-color);
}

.btn-view:hover, .btn-preview:hover {
    background-color: var(--bs-primary);
    color: var(--bs-white);
    transform: scale(1.1);
}

/* Article preview styling */
.article-preview {
    margin: 12px 0 12px 25px;
    padding: 20px;
    background-color: var(--bs-secondary-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius-lg);
    font-size: 14px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-left: 4px solid var(--bs-primary);
}

.article-preview-header {
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--bs-border-color);
    font-size: 20px;
    line-height: 1.2;
    color: var(--bs-body-color);
}

.article-preview-body {
    margin: 8px 0;
}

.preview-text {
    background-color: var(--bs-body-bg);
    padding: 20px;
    border-radius: var(--bs-border-radius);
    border: 1px solid var(--bs-border-color);
    font-size: 20px;
    line-height: 1.2;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--bs-body-color);
    font-family: var(--bs-font-sans-serif);
    max-width: 100%;
    overflow: visible;
}

.article-preview-body pre {
    background-color: var(--bs-tertiary-bg);
    padding: 20px;
    border-radius: var(--bs-border-radius);
    border: 1px solid var(--bs-border-color);
    font-size: 20px;
    line-height: 1.2;
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--bs-body-color);
    font-family: var(--bs-font-sans-serif);
    max-width: 100%;
    overflow: visible;
}

.article-preview-actions {
    text-align: right;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--bs-border-color);
}

.preview-error {
    color: var(--bs-danger-text-emphasis);
    text-align: center;
    font-style: italic;
    padding: 8px;
}

.preview-content {
    overflow: visible;
    line-height: 1.6;
}

.preview-loading {
    text-align: center;
    color: var(--bs-secondary-color);
    font-style: italic;
}

/* Responsive design */
@media (max-width: 576px) {
    /* Extra small devices (phones) */
    .thread-tree-container.compact-view .tree-children {
        margin-left: 8px;
        padding-left: 6px;
    }

    .node-content {
        padding: 2px 4px;
    }

    .node-subject {
        font-size: 12px;
    }

    .node-date {
        display: none; /* Hide dates on very small screens */
    }
}

@media (max-width: 768px) {
    /* Small devices (tablets) */
    .tree-children {
        margin-left: 10px;
        padding-left: 10px;
    }

    .node-author {
        display: none;
    }

    .node-date {
        font-size: 10px;
        min-width: 80px;
    }

    .tree-stats {
        font-size: 11px;
    }

    .node-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .node-author, .node-date {
        min-width: auto;
        font-size: 11px;
    }

    .node-actions {
        margin-left: 0;
        margin-top: 4px;
    }

    .article-preview {
        margin-left: 10px;
        padding: 16px;
        font-size: 13px;
    }

    .preview-text {
        font-size: 13px;
        padding: 16px;
        line-height: 1.6;
    }
}

@media (min-width: 1200px) {
    /* Large devices (desktops) */
    .node-author {
        min-width: 200px;
    }

    .node-date {
        min-width: 140px;
    }
}

@media (min-width: 1400px) {
    /* Extra large devices (large desktops, 4K) */
    .thread-tree {
        font-size: 15px;
    }

    .node-subject {
        font-size: 16px;
    }

    .node-author {
        min-width: 250px;
        font-size: 13px;
    }

    .node-date {
        min-width: 160px;
        font-size: 12px;
    }

    .thread-tree-container.compact-view .tree-children {
        margin-left: 15px;
        padding-left: 10px;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .thread-tree {
        background: #212529 !important;
        border-color: #495057 !important;
        color: #f8f9fa !important;
    }

    .tree-stats {
        background: #343a40 !important;
        color: #adb5bd !important;
    }

    .tree-children {
        border-left-color: #495057 !important;
    }

    .node-content {
        color: #f8f9fa !important;
    }

    .node-content:hover {
        background-color: #343a40 !important;
    }

    .node-subject {
        color: #f8f9fa !important;
    }

    .node-author {
        color: #adb5bd !important;
    }

    .node-date {
        color: #6c757d !important;
    }

    .tree-node[data-depth="0"] .node-subject {
        color: #fff !important;
    }

    .tree-node[data-depth="1"] .node-content {
        background: rgba(77, 171, 247, 0.1) !important;
    }

    .tree-node[data-depth="2"] .node-content {
        background: rgba(77, 171, 247, 0.05) !important;
    }

    .tree-node[data-depth="3"] .node-content {
        background: rgba(77, 171, 247, 0.03) !important;
    }

    .node-toggle {
        color: #adb5bd !important;
    }

    .tree-node.expandable > .node-content .node-toggle {
        color: #4dabf7 !important;
    }

    .tree-node.expandable > .node-content .node-toggle:hover {
        background: rgba(77, 171, 247, 0.2) !important;
    }

    .tree-error {
        background: #491217 !important;
        border-color: #721c24 !important;
        color: #ea868f !important;
    }

    .tree-loading {
        color: #adb5bd !important;
    }

    .article-preview {
        background-color: #2d3748 !important;
        border-color: #4a5568 !important;
        border-left-color: #4dabf7 !important;
    }

    .preview-text {
        background-color: #1a202c !important;
        border-color: #4a5568 !important;
        color: #e2e8f0 !important;
    }
}

/* Details/Summary support for graceful degradation */
.tree-details {
    margin: 0;
    padding: 0;
    display: inline;
}

.tree-details > summary {
    list-style: none;
    margin: 0;
    padding: 0;
    display: inline;
    cursor: pointer;
}

/* Hide default disclosure triangle */
.tree-details > summary::-webkit-details-marker {
    display: none;
}

/* When JavaScript is available, let it handle expand/collapse */
.js-enabled .tree-details > summary {
    pointer-events: auto; /* Allow the toggle button to be clicked */
}

/* For non-JS users, provide clear visual feedback */
.tree-details:not([open]) + .node-link + .tree-children {
    display: none;
}

.tree-details[open] + .node-link + .tree-children {
    display: block;
}

/* Update toggle indicator for details/summary */
.tree-details > summary .toggle-icon::before {
    content: "▶";
    font-size: 10px;
    transition: transform 0.2s;
}

.tree-details[open] > summary .toggle-icon::before {
    content: "▼";
    transform: rotate(0deg);
}

/* When JavaScript is enabled, use the existing toggle styling */
.js-enabled .tree-node.expandable .toggle-icon::before {
    content: "▼";
}

.js-enabled .tree-node.expandable.collapsed .toggle-icon::before {
    content: "▶";
}

/* Compact view */
.thread-tree-container.compact-view .node-author {
    display: none;
}

.thread-tree-container.compact-view .node-date {
    font-size: 10px;
    min-width: 80px;
}

.thread-tree-container.compact-view .node-content {
    padding: 2px 4px;
}

.thread-tree-container.compact-view .tree-children {
    margin-left: 15px;
    padding-left: 10px;
}

.thread-tree-container.compact-view .node-subject {
    font-size: 13px;
}

/* Loading states */
.tree-loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--bs-secondary-color);
    font-style: italic;
}

.tree-loading::before {
    content: "⟳ ";
    animation: spin 1s linear infinite;
}

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

/* Enhanced accessibility */
.tree-node:focus-within {
    outline: 2px solid var(--bs-primary);
    outline-offset: 2px;
}

.btn-view:focus, .btn-preview:focus {
    outline: 2px solid var(--bs-primary);
    outline-offset: 2px;
}