/* PhysicsDNA: interactive mind map (enhancer: assets/js/enh/mindmap.js) */

/* un-enhanced fallback: a readable outline */
.pd-mindmap{margin-block:1.6em}
.pd-mindmap .pd-mm-title{font-family:var(--f-display);font-size:1.35rem;color:var(--ink);margin:0 0 .4em}
.pd-mindmap .pd-mm-sub{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 .6em}
.pd-mindmap ul.pd-mm > li{font-weight:600;color:var(--ink)}
.pd-mindmap ul.pd-mm > li li{font-weight:400;color:var(--ink-2)}
.pd-mindmap.pd-mm-built .pd-mm-src{display:none}

/* the card */
.pd-mm-card{--c:var(--t-road);margin-block:1.2em;border:1px solid var(--line);border-radius:20px;background:var(--surface);box-shadow:var(--shadow);overflow:hidden;scroll-margin-top:84px;color:var(--ink-2)}
.pd-mm-card button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
.pd-mm-bar{display:flex;align-items:center;justify-content:space-between;gap:10px 16px;flex-wrap:wrap;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--tint)}
.pd-mm-seg{display:inline-flex;border:1px solid var(--line);border-radius:999px;padding:3px;background:var(--surface)}
.pd-mm-card .pd-mm-seg button{padding:6px 14px;border-radius:999px;font-size:.84rem;font-weight:600;color:var(--muted);display:inline-flex;align-items:center;gap:6px}
.pd-mm-card .pd-mm-seg button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.pd-mm-rc{display:flex;align-items:center;gap:8px 12px;flex-wrap:wrap}
.pd-mm-card .pd-mm-sw{display:inline-flex;align-items:center;gap:10px;font-size:.88rem;font-weight:600;color:var(--ink)}
.pd-mm-track{width:40px;height:23px;border-radius:999px;background:var(--line);position:relative;transition:background .2s;flex:none}
.pd-mm-track::after{content:"";position:absolute;top:3px;left:3px;width:17px;height:17px;border-radius:50%;background:var(--surface);box-shadow:0 1px 3px rgba(0,0,0,.25);transition:transform .2s}
.pd-mm-sw[aria-pressed="true"] .pd-mm-track{background:var(--t-road)}
.pd-mm-sw[aria-pressed="true"] .pd-mm-track::after{transform:translateX(17px)}
.pd-mm-count{font-family:var(--f-mono);font-size:.78rem;color:var(--muted);font-variant-numeric:tabular-nums}
.pd-mm-count b{color:var(--t-road);font-weight:500}
.pd-mm-card .pd-mm-reset{font-size:.8rem;font-weight:600;color:var(--t-road);text-decoration:underline;text-underline-offset:3px}

.pd-mm-stage{position:relative;height:clamp(440px,70vh,640px);overflow:hidden;touch-action:none;background-color:var(--paper);background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:22px 22px}
.pd-mm-stage[hidden]{display:none}
.pd-mm-svg{display:block;width:100%;height:100%;cursor:grab;user-select:none;-webkit-user-select:none}
.pd-mm-stage.pd-dragging .pd-mm-svg{cursor:grabbing}
.pd-mm-vp{transform-origin:0 0}
.pd-mm-vp.pd-anim{transition:transform .5s cubic-bezier(.2,.7,.2,1)}
.pd-mm-stage text{font-family:var(--f-body)}
.pd-mm-edge{fill:none;stroke:var(--c);stroke-linecap:round}
.pd-mm-eb{stroke-width:3;opacity:.7}
.pd-mm-el{stroke-width:1.6;opacity:.6;stroke-dasharray:1;stroke-dashoffset:0;transition:stroke-dashoffset .45s,opacity .3s}
.pd-mm-el.pd-off{stroke-dashoffset:1;opacity:0}
.pd-mm-cnode rect{fill:var(--accent)}
.pd-mm-cnode .pd-mm-t1{fill:var(--accent-ink);font-family:var(--f-display);font-size:25px;font-weight:500}
.pd-mm-cnode .pd-mm-t2{fill:var(--accent-ink);font-family:var(--f-mono);font-size:10.5px;letter-spacing:.08em;opacity:.8}
.pd-mm-bnode{cursor:pointer;outline:none}
.pd-mm-bnode rect{fill:color-mix(in srgb,var(--c) 14%,var(--surface));stroke:var(--c);stroke-width:2;transition:fill .2s}
.pd-mm-bnode:hover rect,.pd-mm-bnode:focus-visible rect{fill:color-mix(in srgb,var(--c) 26%,var(--surface))}
.pd-mm-bnode:focus-visible rect{stroke-width:3.5}
.pd-mm-bnode .pd-mm-bn{fill:var(--ink);font-family:var(--f-display);font-size:20px;font-weight:500}
.pd-mm-ind circle{fill:var(--surface);stroke:var(--c);stroke-width:1.8}
.pd-mm-ind path{stroke:var(--c);stroke-width:2;stroke-linecap:round;fill:none}
.pd-mm-ind .pd-mm-v{transition:opacity .2s;opacity:0}
.pd-mm-bnode.pd-closed .pd-mm-ind .pd-mm-v{opacity:1}
.pd-mm-leaf{cursor:pointer;outline:none;transition:transform .45s cubic-bezier(.2,.7,.2,1),opacity .3s}
.pd-mm-leaf.pd-off{opacity:0;pointer-events:none}
.pd-mm-bg{fill:var(--surface);stroke:color-mix(in srgb,var(--c) 50%,var(--line));stroke-width:1.4;transition:fill .2s,stroke .2s}
.pd-mm-leaf:hover .pd-mm-bg,.pd-mm-leaf:focus-visible .pd-mm-bg{stroke:var(--c);stroke-width:2}
.pd-mm-leaf.pd-sel .pd-mm-bg{stroke:var(--c);stroke-width:2.6;fill:color-mix(in srgb,var(--c) 10%,var(--surface))}
.pd-mm-ln{fill:var(--muted);font-size:11.5px;font-weight:500;letter-spacing:.01em}
.pd-mm-lf{fill:var(--ink);font-size:15.5px;font-weight:600;transition:opacity .25s}
.pd-mm-bl{opacity:0;transition:opacity .25s;pointer-events:none}
.pd-mm-bl rect{fill:color-mix(in srgb,var(--c) 10%,var(--surface));stroke:var(--c);stroke-width:1.2;stroke-dasharray:4 3}
.pd-mm-bl text{fill:var(--c);font-family:var(--f-mono);font-size:10.5px;letter-spacing:.06em}
.pd-mm-leaf.pd-hid .pd-mm-lf{opacity:0}
.pd-mm-leaf.pd-hid .pd-mm-bl{opacity:1}
.pd-mm-leaf.pd-got .pd-mm-bg{stroke:var(--good);stroke-width:2}
@media (prefers-reduced-motion:reduce){.pd-mm-leaf,.pd-mm-el,.pd-mm-vp.pd-anim{transition:none}}

.pd-mm-zoom{position:absolute;top:12px;right:12px;display:grid;gap:6px;z-index:2}
.pd-mm-card .pd-mm-zoom button{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);display:grid;place-items:center;box-shadow:var(--shadow)}
.pd-mm-card .pd-mm-zoom button:hover{border-color:var(--t-road);color:var(--t-road)}
.pd-mm-hint{position:absolute;left:12px;top:12px;font-family:var(--f-mono);font-size:.7rem;color:var(--muted);background:color-mix(in srgb,var(--surface) 85%,transparent);border:1px solid var(--line);border-radius:999px;padding:5px 11px;pointer-events:none;max-width:calc(100% - 80px)}
.pd-mm-panel{position:absolute;left:12px;bottom:12px;width:min(380px,calc(100% - 24px));background:var(--surface);border:1px solid var(--line);border-top:4px solid var(--c);border-radius:14px;box-shadow:0 18px 40px -16px rgba(0,0,0,.35);padding:14px 16px 16px;display:grid;gap:8px;z-index:3;max-height:calc(100% - 24px);overflow:auto}
.pd-mm-panel[hidden]{display:none}
.pd-mm-ph{display:flex;justify-content:space-between;align-items:start;gap:10px}
.pd-mm-panel .eyebrow{color:var(--c)}
.pd-mm-panel h4{font-family:var(--f-display);font-weight:500;font-size:1.3rem;margin:2px 0 0;color:var(--ink);line-height:1.2}
.pd-mm-card .pd-mm-x{width:30px;height:30px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;color:var(--ink);flex:none}
.pd-mm-fx{background:var(--tint);border:1px solid var(--line);border-radius:10px;padding:8px 10px;overflow-x:auto;color:var(--ink);text-align:center;max-width:100%}
.pd-mm-fx mjx-container[display="true"]{margin:.3em 0 !important}
.pd-mm-panel p{font-size:.93rem;line-height:1.55;margin:0}
.pd-mm-nav{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.pd-mm-rel{display:inline-flex;align-items:center;gap:7px;font-size:.84rem;font-weight:600;color:var(--ink);padding:6px 12px;border-radius:999px;border:1px solid var(--line);text-decoration:none;justify-self:start}
.pd-mm-rel:hover{border-color:var(--c)}
.pd-mm-rel i{width:8px;height:8px;border-radius:50%;background:var(--c)}
.pd-mm-pv{display:flex;gap:4px}
.pd-mm-card .pd-mm-pv button{width:30px;height:30px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;color:var(--ink)}
.pd-mm-card .pd-mm-pv button:hover{border-color:var(--c)}
.pd-mm-foot{display:flex;justify-content:space-between;gap:8px 14px;flex-wrap:wrap;padding:10px 16px;border-top:1px solid var(--line);font-family:var(--f-mono);font-size:.7rem;color:var(--muted)}

/* list view */
.pd-mm-list{padding:12px;display:grid;gap:10px;background:var(--paper)}
.pd-mm-list[hidden]{display:none}
.pd-mm-acc{border:1px solid var(--line);border-left:4px solid var(--c);border-radius:14px;background:var(--surface);overflow:hidden}
.pd-mm-acc summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;padding:13px 16px;font-family:var(--f-display);font-size:1.2rem;color:var(--ink)}
.pd-mm-acc summary::-webkit-details-marker{display:none}
.pd-mm-acc summary i{width:10px;height:10px;border-radius:50%;background:var(--c);flex:none}
.pd-mm-acc summary span{min-width:0}
.pd-mm-acc summary em{margin-left:auto;font-style:normal;font-family:var(--f-mono);font-size:.72rem;color:var(--muted);white-space:nowrap}
.pd-mm-acc summary::after{content:"+";font-family:var(--f-mono);color:var(--c);font-size:1.1rem}
.pd-mm-acc[open] summary::after{content:"−"}
.pd-mm-why{margin:0;padding:0 16px 10px;font-size:.9rem;color:var(--ink-2)}
.pd-content .pd-mm-acc ul,.pd-mm-acc ul{list-style:none;margin:0;padding:0 10px 10px;display:grid;gap:6px}
.pd-mm-lrow{border:1px solid var(--line);border-radius:12px;overflow:hidden;margin:0}
.pd-mm-card .pd-mm-lrow > button{width:100%;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 10px;align-items:center;padding:10px 12px;text-align:left}
.pd-mm-ln2{font-size:.8rem;color:var(--muted);font-weight:500}
.pd-mm-lf2{grid-column:1/-1;color:var(--ink);overflow-x:auto;overflow-y:hidden;max-width:100%;min-width:0}
.pd-mm-bl2{grid-column:1/-1;display:none;justify-self:start;font-family:var(--f-mono);font-size:.74rem;color:var(--c);border:1px dashed var(--c);background:color-mix(in srgb,var(--c) 8%,var(--surface));border-radius:8px;padding:6px 12px}
.pd-mm-lrow.pd-hid .pd-mm-lf2{display:none}
.pd-mm-lrow.pd-hid .pd-mm-bl2{display:inline-block}
.pd-mm-lrow.pd-got{border-color:color-mix(in srgb,var(--good) 50%,var(--line))}
.pd-mm-chev{grid-row:1;grid-column:2;font-family:var(--f-mono);color:var(--muted);font-size:.8rem}
.pd-mm-lx{padding:0 12px 12px;display:grid;gap:8px;font-size:.93rem}
.pd-mm-lx[hidden]{display:none}
.pd-mm-lx p{margin:0}

/* full screen */
.pd-mm-card.pd-mm-full{position:fixed;inset:0;z-index:1000;margin:0;border-radius:0;display:flex;flex-direction:column}
.pd-mm-card.pd-mm-full .pd-mm-stage{flex:1;height:auto}
html.pd-mm-lock,html.pd-mm-lock body{overflow:hidden}

@media (max-width:620px){
  .pd-mm-bar{padding:10px}
  .pd-mm-hint,.pd-mm-tip{display:none}
  .pd-mm-card{border-radius:16px}
  .pd-mm-stage{height:clamp(420px,72vh,560px)}
}