.research-sheet{height:min(580px,calc(100% - 130px))}
.research-sheet .sheet-content{display:flex;flex:1;flex-direction:column;min-height:0;overflow:hidden;padding:0;touch-action:auto}
.research-sheet .research-toolbar{display:flex;align-items:center;flex-shrink:0;gap:14px;margin:0;padding:0 18px;border-bottom:1px solid #718aa529}
.research-toolbar .tabs{flex:1;border:0;gap:22px}
.research-toolbar .tabs button{font-size:12px;padding:13px 5px;min-height:42px}
.research-count{font:11px Consolas,monospace;color:#99b3cd;white-space:nowrap}
.research-legend{display:flex;align-items:center;gap:14px;padding:8px 20px;font-size:10px;flex-shrink:0;background:#111a31;border-bottom:1px solid #45648529;color:#a3b8cb}
.research-legend>span:before{content:"";display:inline-block;width:6px;height:6px;border-radius:2px;margin-right:5px;background:#54718c}
.research-legend .done:before{background:#50e986}.research-legend .ready:before{background:#5ddfff}
.research-legend .waiting:before{background:#b5bdc7}
.research-legend small{font-size:10px;margin-left:auto;color:#7e99b5}
.research-map{position:relative;flex:1;min-height:0;isolation:isolate;background:radial-gradient(ellipse at 45% 75%,#17304a65,transparent 65%),#0d1230}
.research-map:before{content:"";position:absolute;inset:0;pointer-events:none;background-image:radial-gradient(#9ed9fb24 .6px,transparent .6px);background-size:38px 38px;opacity:.45}
.research-sheet .tech-tree-viewport{position:absolute;inset:0;margin:0;padding:0;overflow:auto;overscroll-behavior:contain;touch-action:pan-x pan-y;scrollbar-width:thin;scrollbar-color:#4f769d66 transparent;cursor:grab;user-select:none;-webkit-user-select:none}
.research-sheet .tech-tree-viewport.dragging{cursor:grabbing}
.research-stage{position:relative;min-width:100%;min-height:100%}
.research-sheet .tech-tree{position:absolute;left:0;top:0;display:block;grid-template-columns:none;gap:0;padding:0;margin:0;transform-origin:top left}
.research-sheet .tree-links{position:absolute;inset:0;width:100%;height:100%;overflow:visible;z-index:0}
.research-sheet .tree-links path{fill:none;stroke:#39495f;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.research-sheet .tree-links .complete{stroke:#4dea83;filter:drop-shadow(0 0 2px #4fea8350)}
.research-sheet .tree-links .open{stroke:#80b6bf;stroke-opacity:.8}
.research-sheet .tree-links .pending{stroke-opacity:.6}
.research-sheet .tech-node{position:absolute;display:grid;place-items:center;width:44px;height:44px;min-width:44px;min-height:44px;padding:2px;border:2px solid #566b82;border-radius:5px;background:linear-gradient(145deg,#254f68,#14233e);box-shadow:inset 0 1px 0 #d9f9ff2d,0 2px 5px #0005;z-index:1;overflow:visible;outline-offset:3px;transition:border-color .15s,background .15s}
.research-sheet .tech-node:before,.research-sheet .tech-node:after{display:none}
.research-sheet .tech-node:hover,.research-sheet .tech-node:active{transform:none;background:linear-gradient(145deg,#336583,#192d49)}
.research-art{display:block;width:36px;height:36px;overflow:visible;filter:drop-shadow(0 1px 1px #07152580);pointer-events:none}
.research-sheet .tech-node.researched{border-color:#51ed7c;background:linear-gradient(145deg,#218b6959,#18333f);box-shadow:inset 0 0 6px #37f29545,0 0 5px #36ef6820}
.research-sheet .tech-node.available{border-color:#6fe9ff;background:linear-gradient(145deg,#245d77,#162d49);box-shadow:inset 0 0 5px #54dcff4f,0 0 6px #4fd4ff2b}
.research-sheet .tech-node.waiting{border-color:#acb6c2;background:linear-gradient(145deg,#485463,#2c3646);box-shadow:inset 0 1px 0 #e4ebef30,0 2px 5px #0005}
.research-sheet .tech-node.waiting .research-art{opacity:.9}
.research-sheet .tech-node.locked{border-color:#3c536b;background:linear-gradient(145deg,#203b50,#16243a);box-shadow:inset 0 1px 0 #8dbbd422}
.research-sheet .tech-node.locked .research-art{opacity:.38;filter:saturate(.7)}
.research-sheet .tech-node.off-branch{opacity:.28}
.research-sheet .tech-node.off-branch:hover,.research-sheet .tech-node.off-branch:focus-visible{opacity:1}
.tech-level{position:absolute;top:0;left:1px;min-width:12px;height:14px;text-align:center;border-radius:2px;background:#082134cc;color:#ecffff;font:bold 11px/14px "Segoe UI",sans-serif;text-shadow:0 1px 3px #000;pointer-events:none}
.tech-state{position:absolute;right:-4px;bottom:-4px;height:13px;min-width:13px;line-height:11px;border:1px solid #8cdaba;border-radius:50%;background:#163c38;color:#a7ffb6;font-size:9px;pointer-events:none}
.tech-node.available .tech-state{color:#d2fbff;background:#16465e;border-color:#72e3ff}
.tech-node.waiting .tech-state{color:#e1e6ec;background:#46515e;border-color:#adb7c2}
.tech-node.locked .tech-state{display:none}
.tech-tooltip{display:none;position:absolute;left:50%;bottom:calc(100% + 7px);transform:translateX(-50%);white-space:nowrap;padding:5px 8px;background:#081228f2;border:1px solid #668faf8a;border-radius:5px;color:#e3f5ff;font-size:11px;font-weight:500;pointer-events:none}
.tech-node:focus-visible{z-index:4}.tech-node:focus-visible .tech-tooltip{display:block}
@media(hover:hover){.tech-node:hover{z-index:4}.tech-node:hover .tech-tooltip{display:block}}
.research-map-controls{position:absolute;right:10px;bottom:8px;display:flex;align-items:center;gap:0;background:#0c1b38e8;border:1px solid #5fafd054;border-radius:9px;z-index:5;box-shadow:0 3px 10px #07091e7d}
.research-map-controls button{width:36px;height:36px;color:#b2edff;font-size:24px;line-height:1}
.research-map-controls button:last-child{border-left:1px solid #608fb933;font-size:23px}
.research-zoom-value{width:34px;text-align:center;font:10px Consolas,monospace;color:#9cc2df}
.project-hero>.research-art{height:76px;width:76px;padding:8px;border-radius:15px;background:linear-gradient(135deg,#234968,#192943);border:1px solid #65a5bc4a}
@media(max-width:760px),(max-height:500px) and (pointer:coarse){
  .research-sheet{height:51%;max-height:calc(100% - 100px)}
  .research-sheet .sheet-header{min-height:48px}
  .research-sheet .research-toolbar{flex-wrap:nowrap;padding:0 10px;gap:8px;margin:0}
  .research-toolbar .tabs{gap:0;min-height:39px;flex:1;width:auto}
  .research-toolbar .tabs button{min-height:39px;padding:9px 7px;font-size:12px}
  .research-count{font-size:10px}
  .research-legend{gap:10px;padding:6px 12px;font-size:9px}
  .research-legend small{display:none}
  .research-map-controls{right:7px;bottom:6px}
  .research-map-controls button{width:38px;height:38px}
}
@media(max-width:360px){.research-legend small{display:none}}
@media(max-height:500px) and (pointer:coarse){.research-sheet{height:65%;max-height:calc(100% - 64px)}}