.kg-shell {
  padding: 18px 24px 24px;
  max-width: 1680px;
  margin: 0 auto;
}

.kg-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.kg-toolbar-right {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.kg-topic-picker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--text-1);
}

.kg-topic-picker select {
  appearance: none;
  -webkit-appearance: none;
  background: rgba(11, 16, 24, 0.7);
  color: var(--text-0);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 6px 28px 6px 12px;
  font-size: 13px;
  letter-spacing: 0.3px;
  cursor: pointer;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='%239aa4b2' d='M0 0l5 6 5-6z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color 0.15s;
}
.kg-topic-picker select:hover { border-color: var(--accent); }
.kg-topic-picker select:focus { outline: none; border-color: var(--accent); }

.kg-title h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: -0.4px;
  font-weight: 600;
}

.kg-title p {
  margin: 0;
  color: var(--text-1);
  font-size: 14px;
}

.kg-stats {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--text-1);
}

.kg-stats b {
  color: var(--text-0);
  font-weight: 600;
  margin-right: 4px;
}

.kg-stats .stat-sep { color: var(--text-2); }
.kg-stats .dim { color: var(--accent); }

.kg-controls-bar {
  display: flex;
  gap: 22px;
  padding: 10px 16px;
  margin-bottom: 12px;
  background: rgba(11, 16, 24, 0.6);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 12px;
  color: var(--text-1);
  align-items: center;
  flex-wrap: wrap;
}

.kg-controls-bar label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.kg-controls-bar .lbl {
  letter-spacing: 1px;
  color: var(--text-1);
  min-width: 28px;
}

.kg-controls-bar .val {
  min-width: 38px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
  font-size: 11.5px;
  color: var(--text-0);
  text-align: right;
}

.kg-controls-bar .hint {
  font-size: 11px;
  color: var(--text-2);
  letter-spacing: 0.3px;
}

.kg-tips {
  margin: 6px 2px 14px;
  font-size: 12px;
  color: var(--text-2);
  line-height: 1.5;
  letter-spacing: 0.2px;
}

.kg-tips b { color: var(--text-1); font-weight: 500; }

.kg-tips kbd {
  display: inline-block;
  padding: 1px 6px;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  font-family: "JetBrains Mono", "SF Mono", Menlo, monospace;
  font-size: 10.5px;
  color: var(--text-1);
  background: rgba(255, 255, 255, 0.04);
}

.kg-controls-bar input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 140px;
  height: 4px;
  background: var(--line-strong);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.kg-controls-bar input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent);
  transition: transform 0.15s;
}

.kg-controls-bar input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.kg-controls-bar input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  box-shadow: 0 0 10px var(--accent);
}

.kg-canvas-wrap {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  background:
    radial-gradient(1400px 700px at 50% 0%, rgba(76, 201, 240, 0.06), transparent 70%),
    linear-gradient(180deg, #060a12 0%, #04060a 100%);
  border: 1px solid var(--line);
  height: calc(100vh - 160px);
  min-height: 640px;
}

#kg-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}

#kg-canvas.is-dragging { cursor: grabbing; }
#kg-canvas.is-hovering-node { cursor: pointer; }

/* Subtle dot grid overlay */
.kg-canvas-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, #000 50%, transparent 100%);
}

/* Static legend at the bottom-left of the canvas (color reference only) */
.kg-legend {
  position: absolute;
  left: 16px;
  bottom: 16px;
  display: flex;
  gap: 14px;
  padding: 8px 12px;
  background: rgba(11, 16, 24, 0.7);
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(10px);
  font-size: 12px;
  color: var(--text-1);
}

.kg-legend span { display: inline-flex; align-items: center; gap: 6px; }
.kg-legend i {
  width: 8px; height: 8px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px currentColor;
}

/* Top label-toggle bar */
.kg-controls-bar-2 { margin-top: 4px; }

.kg-label-toggles {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.kg-toggle-group {
  display: inline-flex;
  gap: 4px;
  flex-wrap: wrap;
}

.kg-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px 4px 8px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--text-1);
  cursor: pointer;
  font-size: 12px;
  letter-spacing: 0.2px;
  transition: all 0.15s;
}

.kg-toggle-btn:hover { color: var(--text-0); background: rgba(255,255,255,0.04); }

.kg-toggle-btn.is-on {
  color: var(--text-0);
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.28);
}

.kg-toggle-btn i {
  width: 8px; height: 8px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px currentColor;
}

/* "Click-to-expand" mode toggle pill — placed at the left of the toggle row */
.kg-pill-btn {
  padding: 6px 14px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--text-1);
  font-size: 12px;
  letter-spacing: 0.4px;
  cursor: pointer;
  transition: all 0.15s;
  flex: 0 0 auto;
}
.kg-pill-btn:hover { color: var(--text-0); border-color: var(--accent); }
.kg-pill-btn.is-on {
  background: var(--accent);
  border-color: var(--accent);
  color: #06121a;
  font-weight: 600;
  box-shadow: 0 0 14px rgba(76, 201, 240, 0.35);
}

.kg-expand-hint {
  font-size: 11.5px;
  color: var(--text-2);
  letter-spacing: 0.2px;
  max-width: 280px;
  line-height: 1.4;
  margin-right: 12px;
}


/* Controls */
.kg-controls {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: flex;
  gap: 8px;
}

.kg-controls button {
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(11, 16, 24, 0.7);
  border: 1px solid var(--line);
  color: var(--text-1);
  font-size: 12px;
  cursor: pointer;
  letter-spacing: 0.5px;
  backdrop-filter: blur(10px);
  transition: all 0.2s;
}
.kg-controls button:hover {
  color: var(--text-0);
  border-color: var(--line-strong);
  background: rgba(20, 28, 42, 0.8);
}

/* Tooltip */
.kg-tooltip {
  position: absolute;
  pointer-events: none;
  padding: 6px 10px;
  background: rgba(11, 16, 24, 0.94);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--text-0);
  white-space: nowrap;
  transform: translate(-50%, -130%);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  z-index: 5;
}

.kg-tooltip .tt-cat {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 10px;
  letter-spacing: 1px;
  background: var(--line);
  color: var(--text-1);
  vertical-align: middle;
}

/* Detail panel */
.kg-detail {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 320px;
  max-height: calc(100% - 32px);
  overflow: auto;
  padding: 18px;
  background: rgba(11, 16, 24, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 14px;
  backdrop-filter: blur(18px) saturate(120%);
  -webkit-backdrop-filter: blur(18px) saturate(120%);
  z-index: 6;
  animation: kg-slide-in 0.25s ease both;
}

.kg-detail::-webkit-scrollbar { width: 6px; }
.kg-detail::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }
.kg-detail::-webkit-scrollbar-track { background: transparent; }

.kg-detail-section + .kg-detail-section { margin-top: 16px; }

.kg-detail-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.kg-detail-links a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 9px;
  background: var(--line);
  color: var(--text-0);
  font-size: 13px;
  transition: all 0.15s;
}
.kg-detail-links a:hover {
  background: var(--line-strong);
  transform: translateY(-1px);
}

.lk-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
  flex: 0 0 auto;
  color: #fff;
}
.lk-yt   { background: #ff3a3a; }
.lk-bili { background: #00a1d6; }
.lk-wiki { background: #444; }
.lk-g    { background: #4285f4; }

.group-head {
  margin-top: 8px;
  padding: 4px 4px !important;
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--text-2) !important;
  text-transform: uppercase;
  cursor: default !important;
}
.group-head:first-child { margin-top: 0; }
.group-head:hover { background: transparent !important; }

@keyframes kg-slide-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.kg-detail-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.kg-detail-cat {
  font-size: 11px;
  letter-spacing: 1.4px;
  font-family: "JetBrains Mono", monospace;
  padding: 3px 8px;
  border-radius: 6px;
  background: var(--line);
}

.kg-detail-close {
  background: transparent;
  border: none;
  color: var(--text-1);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
}
.kg-detail-close:hover { color: var(--text-0); }

.kg-detail h3 {
  margin: 0 0 6px;
  font-size: 18px;
  letter-spacing: -0.2px;
}

.kg-detail-summary {
  margin: 0 0 12px;
  padding: 10px 12px;
  background: rgba(76, 201, 240, 0.06);
  border-left: 2px solid var(--accent);
  border-radius: 4px;
  color: var(--text-0);
  font-size: 13px;
  line-height: 1.55;
}

.kg-detail-meta {
  margin: 0 0 14px;
  color: var(--text-1);
  font-size: 12.5px;
}

.kg-detail-section h4 {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--text-2);
  text-transform: uppercase;
  font-weight: 500;
}

.kg-detail-section h4 span { color: var(--text-1); margin-left: 4px; }

.kg-detail-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.kg-detail-section li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s;
}

.kg-detail-section li:hover {
  background: var(--line);
}

.kg-detail-section li i {
  width: 7px; height: 7px;
  border-radius: 50%;
  display: inline-block;
  flex: 0 0 auto;
  box-shadow: 0 0 6px currentColor;
}

@media (max-width: 720px) {
  .kg-shell { padding: 16px; }
  .kg-canvas-wrap { height: calc(100vh - 220px); }
  .kg-detail { width: calc(100% - 32px); max-height: 50%; }
  .kg-legend { font-size: 11px; gap: 8px; padding: 6px 10px; }
}