/* ===========================================================
   培森题库 · 数学知识图谱
   =========================================================== */
body.kg-page { height: 100vh; overflow: hidden; display: flex; flex-direction: column; background: #f4f9fa; }

.kg-wrap { flex: 1; display: flex; min-height: 0; }

/* 左侧筛选 */
.kg-side {
  width: 258px; flex-shrink: 0; background: #fff; border-right: 1px solid var(--line);
  padding: 18px 16px; overflow-y: auto;
}
.kg-side h2 { font-size: 15px; margin: 0 0 4px; letter-spacing: -.2px; }
.kg-side .sub { font-size: 12px; color: var(--muted); margin: 0 0 18px; line-height: 1.7; }
.kg-side h5 {
  font-size: 11.5px; color: var(--muted); font-weight: 600; letter-spacing: .8px;
  margin: 0 0 8px; text-transform: uppercase;
}
.kg-side .grp { margin-bottom: 18px; }
.kg-side .field { margin-bottom: 10px; }
.kg-side .input { height: 34px; font-size: 13px; }

.kg-chip {
  display: inline-flex; align-items: center; gap: 5px; height: 27px; padding: 0 10px;
  border-radius: 8px; border: 1px solid var(--line-2); background: #fff;
  font-size: 12.5px; color: var(--ink-2); cursor: pointer; margin: 0 5px 5px 0;
  transition: .14s;
}
.kg-chip:hover { border-color: #c9dcdd; }
.kg-chip.on { background: var(--pri-l); border-color: #bfe9e4; color: var(--pri-dd); font-weight: 600; }
.kg-chip i { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }

.kg-legend-row { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink-2); margin-bottom: 7px; }
.kg-legend-row i { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }

.kg-stat {
  display: flex; gap: 8px; margin-top: 4px;
}
.kg-stat div { flex: 1; background: #fbfdfd; border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; }
.kg-stat b { display: block; font-size: 17px; color: var(--pri-dd); letter-spacing: -.5px; }
.kg-stat span { font-size: 11px; color: var(--muted); }

/* 画布 */
.kg-stage { flex: 1; min-width: 0; position: relative; overflow: hidden; }
#kg { display: block; cursor: grab; }
#kg.dragging { cursor: grabbing; }
#kg.hovering { cursor: pointer; }

.kg-tools {
  position: absolute; right: 16px; bottom: 16px; display: flex; flex-direction: column; gap: 6px;
}
.kg-tools button {
  width: 34px; height: 34px; border-radius: 9px; border: 1px solid var(--line-2);
  background: rgba(255,255,255,.96); color: var(--ink-2); cursor: pointer;
  display: grid; place-items: center; box-shadow: var(--sh-s);
}
.kg-tools button:hover { border-color: var(--pri); color: var(--pri-dd); }
.kg-tools button svg { width: 15px; height: 15px; }

.kg-hint {
  position: absolute; left: 16px; bottom: 16px; font-size: 11.5px; color: var(--muted);
  background: rgba(255,255,255,.85); padding: 5px 10px; border-radius: 8px;
  border: 1px solid var(--line);
}

/* 详情面板 */
.kg-panel {
  position: absolute; right: 16px; top: 16px; width: 330px; max-height: calc(100% - 32px);
  background: #fff; border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--sh-l); display: none; flex-direction: column; overflow: hidden;
}
.kg-panel.show { display: flex; }
.kg-panel .ph {
  padding: 16px 18px 12px; border-bottom: 1px solid var(--line); position: relative;
}
.kg-panel .ph .x {
  position: absolute; right: 12px; top: 12px; border: none; background: transparent;
  color: var(--muted); cursor: pointer; font-size: 17px; line-height: 1; padding: 4px;
}
.kg-panel .ph h3 { margin: 0 0 8px; font-size: 18px; letter-spacing: -.3px; padding-right: 22px; }
.kg-panel .ph .meta { display: flex; gap: 6px; flex-wrap: wrap; }
.kg-panel .body { padding: 14px 18px 18px; overflow-y: auto; }
.kg-panel .desc { font-size: 13.5px; color: var(--ink-2); line-height: 1.8; margin: 0 0 16px; }
.kg-panel h6 {
  font-size: 11.5px; color: var(--muted); margin: 0 0 7px;
  letter-spacing: .6px; text-transform: uppercase; font-weight: 600;
}
.kg-panel .rel { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 14px; }
.kg-panel .rel span {
  font-size: 12px; padding: 3px 9px; border-radius: 7px; cursor: pointer;
  background: #f3f8f9; color: var(--ink-2); border: 1px solid var(--line);
}
.kg-panel .rel span:hover { border-color: var(--pri); color: var(--pri-dd); background: var(--pri-l2); }
.kg-panel .rel .none { background: transparent; border: none; color: var(--muted); cursor: default; font-size: 12px; }

.qlist-mini { margin-bottom: 10px; }
.qlist-mini .qi {
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 9px; margin-bottom: 6px;
  font-size: 12.5px; color: var(--ink-2); line-height: 1.65; cursor: pointer;
  background: #fcfefe; max-height: 62px; overflow: hidden;
}
.qlist-mini .qi:hover { border-color: var(--pri); background: var(--pri-l2); }
.kg-panel .btn-block { margin-top: 4px; }

.kg-mbar { display: none; }

@media (max-width: 980px) {
  .kg-side { display: none; }
  .kg-panel { width: calc(100% - 32px); }
  .kg-mbar {
    display: flex; flex-direction: column; gap: 6px;
    position: absolute; left: 12px; right: 12px; top: 12px; z-index: 6;
    background: rgba(255, 255, 255, .94); border: 1px solid var(--line);
    border-radius: 12px; padding: 8px; box-shadow: var(--sh-s);
    backdrop-filter: blur(6px);
  }
  .kg-mbar .input { height: 34px; font-size: 13px; }
  .mlevels { display: flex; gap: 5px; flex-wrap: wrap; }
  .mlevels .kg-chip { margin: 0; height: 25px; font-size: 12px; padding: 0 9px; }
  .kg-tools { bottom: 86px; }
  .kg-hint { display: none; }
}