/* ════════════════════════════════════════════════
   Knowledge Graph
   ════════════════════════════════════════════════ */

/* ══════════════════════════════════════════════════════
   KNOWLEDGE GRAPH
   ══════════════════════════════════════════════════════ */
.kg-page {
    position: fixed;
    inset: 0;
    z-index: 9800;
    background: #070712;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
html.light-mode .kg-page {
    background: #eef0ff;
}
.kg-inner {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.kg-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 24px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    z-index: 10;
}
.kg-header-center { text-align: center; flex: 1; }
.kg-title {
    font-size: 20px;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0;
}
.kg-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 3px 0 0;
}
.kg-controls { display: flex; gap: 8px; }
.kg-ctrl-btn {
    padding: 6px 14px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: rgba(139,92,246,0.06);
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.kg-ctrl-btn:hover {
    background: rgba(139,92,246,0.15);
    border-color: rgba(139,92,246,0.4);
    color: var(--accent);
}
.kg-body {
    flex: 1;
    position: relative;
    overflow: hidden;
}
.kg-canvas-wrap {
    width: 100%;
    height: 100%;
    position: relative;
}
#kgSvg {
    display: block;
    cursor: grab;
}
#kgSvg:active { cursor: grabbing; }

.kg-empty {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--text-secondary);
    padding: 40px;
}
.kg-empty h3 { font-size: 18px; font-weight: 700; color: var(--text-primary); margin: 0 0 8px; }
.kg-empty p { font-size: 13px; max-width: 360px; line-height: 1.6; }

/* Detail panel */
.kg-detail-panel {
    position: absolute;
    right: 16px;
    top: 16px;
    width: 320px;
    max-height: calc(100% - 32px);
    background: rgba(22,22,42,0.92);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(139,92,246,0.25);
    border-radius: 16px;
    padding: 20px;
    overflow-y: auto;
    box-shadow: 0 16px 48px rgba(0,0,0,0.5);
    animation: slideUp 0.2s ease;
    z-index: 20;
}
.light-mode .kg-detail-panel {
    background: rgba(255,255,255,0.95);
    border-color: #e5e7eb;
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}
.kg-detail-close {
    position: absolute;
    right: 12px;
    top: 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    line-height: 1;
}
.kg-detail-close:hover { color: var(--accent); }
.kg-detail-type {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}
.kg-detail-type-video { background: rgba(139,92,246,0.15); color: #a78bfa; }
.kg-detail-type-concept { background: rgba(16,185,129,0.15); color: #34d399; }
.kg-detail-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.3;
}
.kg-detail-meta {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 14px;
    line-height: 1.5;
}
.kg-detail-section-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 14px 0 8px;
}
.kg-detail-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.kg-detail-list li {
    font-size: 12px;
    color: var(--text-primary);
    padding: 6px 10px;
    border-radius: 8px;
    margin-bottom: 4px;
    background: rgba(139,92,246,0.05);
    border: 1px solid rgba(139,92,246,0.08);
    cursor: pointer;
    transition: all 0.2s;
}
.kg-detail-list li:hover {
    background: rgba(139,92,246,0.12);
    border-color: rgba(139,92,246,0.25);
}

/* Legend */
.kg-legend {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    padding: 10px 24px;
    border-top: 1px solid var(--border);
    background: var(--bg-card);
    font-size: 12px;
    color: var(--text-secondary);
    flex-shrink: 0;
}
.kg-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.kg-legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}
.kg-legend-hint {
    margin-left: auto;
    font-size: 11px;
    opacity: 0.6;
}

/* D3 graph styles */
.kg-link {
    stroke: rgba(139,92,246,0.15);
    stroke-width: 1.5;
    fill: none;
}
.kg-link-cross {
    stroke: rgba(251,191,36,0.35);
    stroke-width: 2;
    stroke-dasharray: 4 3;
}
.kg-node-label {
    font-family: var(--font);
    font-size: 10px;
    fill: var(--text-secondary);
    text-anchor: middle;
    pointer-events: none;
    user-select: none;
}
.kg-node-label-video {
    font-size: 11px;
    font-weight: 700;
    fill: var(--text-primary);
}

@media (max-width: 700px) {
    .kg-header { padding: 10px 14px; }
    .kg-title { font-size: 16px; }
    .kg-detail-panel { width: calc(100% - 24px); right: 12px; }
    .kg-controls { gap: 4px; }
    .kg-ctrl-btn { padding: 5px 10px; font-size: 11px; }
}


@media (max-width: 480px) {
    .kg-page { }
}