/* 知识图谱与双向链接样式 */

.bidirectional-link {
    color: var(--md-primary-fg-color);
    background: var(--md-primary-fg-color--transparent, rgba(103, 58, 183, 0.08));
    padding: 0 4px;
    border-radius: 4px;
    text-decoration: none;
    border-bottom: 1px dashed var(--md-primary-fg-color);
    transition: background 0.2s;
}

.bidirectional-link:hover {
    background: var(--md-primary-fg-color);
    color: var(--md-primary-bg-color);
    text-decoration: none;
}

.bidirectional-link-broken {
    color: #999;
    border-bottom-color: #999;
    cursor: not-allowed;
}

/* 反向链接 */
.backlinks-section {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--md-default-fg-color--lightest);
}

.backlinks-title {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--md-default-fg-color);
}

.backlinks-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
}

.backlink-card {
    display: block;
    padding: 14px 16px;
    border-radius: 8px;
    border: 1px solid var(--md-default-fg-color--lightest);
    background: var(--md-code-bg-color);
    text-decoration: none;
    transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}

.backlink-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: var(--md-primary-fg-color--transparent);
    text-decoration: none;
}

.backlink-title {
    font-weight: 600;
    color: var(--md-default-fg-color);
    margin-bottom: 6px;
    font-size: 0.95rem;
}

.backlink-desc {
    color: var(--md-default-fg-color--light);
    font-size: 0.8rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 知识图谱页面 */
.graph-page h1 {
    margin-bottom: 0.5rem;
}

.graph-page-desc {
    color: var(--md-default-fg-color--light);
    margin-bottom: 1rem;
}

#graph-toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

#graph-toolbar label {
    font-weight: 500;
}

#graph-toolbar select,
#graph-toolbar input {
    padding: 6px 10px;
    border-radius: 6px;
    border: 1px solid var(--md-default-fg-color--lightest);
    background: var(--md-code-bg-color);
    color: var(--md-default-fg-color);
    font-size: 0.9rem;
}

#graph-toolbar input {
    min-width: 180px;
}

#graph-toolbar button {
    padding: 6px 14px;
    border-radius: 6px;
    border: 1px solid var(--md-primary-fg-color);
    background: var(--md-primary-fg-color);
    color: var(--md-primary-bg-color);
    cursor: pointer;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

#graph-toolbar button:hover {
    opacity: 0.9;
}

#graph-container {
    width: 100%;
    min-height: 500px;
    border: 1px solid var(--md-default-fg-color--lightest);
    border-radius: 12px;
    background: var(--md-code-bg-color);
    overflow: hidden;
}

#knowledge-graph-svg {
    display: block;
    width: 100%;
    cursor: grab;
}

#knowledge-graph-svg:active {
    cursor: grabbing;
}

.graph-node {
    cursor: pointer;
}

.graph-node circle {
    transition: r 0.2s;
}

.graph-node:hover circle {
    r: 12;
}

.graph-node-dim {
    opacity: 0.15;
}

.graph-link-dim {
    opacity: 0.05;
}

#graph-tooltip {
    position: absolute;
    opacity: 0;
    pointer-events: none;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 12px;
    z-index: 1000;
    transition: opacity 0.15s;
    max-width: 240px;
}

.graph-empty {
    padding: 60px 20px;
    text-align: center;
    color: var(--md-default-fg-color--light);
}