:root{--bg:#eef3f8;--surface:#ffffffe0;--line:#dce5f1;--ink:#162033;--muted:#667085;--blue:#2457d6;--soft:#f8fbff;color:var(--ink);background:var(--bg);font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif}*{box-sizing:border-box}body{background:radial-gradient(circle at 50% 25%,#2457d61f,#0000 34%),linear-gradient(#eef3f8,#f7f9fc);min-width:320px;height:100vh;margin:0;overflow:hidden}button,input{font:inherit}.lock-screen{z-index:50;background:radial-gradient(circle at 50% 30%,#2457d624,#0000 34%),linear-gradient(#eef3f8,#f8fbff);place-items:center;padding:24px;transition:opacity .28s,visibility .28s;display:grid;position:fixed;inset:0}.lock-screen.is-unlocked{visibility:hidden;opacity:0;pointer-events:none}.lock-card{border:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffeb;border-radius:8px;width:min(420px,100%);padding:28px;box-shadow:0 24px 70px #18274b29}.lock-card strong{background:var(--blue);color:#fff;border-radius:8px;place-items:center;width:72px;height:38px;margin-bottom:18px;font-size:20px;font-weight:900;display:grid}.lock-card h1{margin:0 0 16px;font-size:22px}.password-row{grid-template-columns:minmax(0,1fr) 76px;gap:8px;display:grid}.password-row input,.password-row button{border-radius:8px;height:42px}.password-row button{background:var(--blue);color:#fff;cursor:pointer;border:0;font-weight:900}.password-error{color:#cf3d3d;min-height:18px;margin-top:10px;font-size:12px;font-weight:850}.app{grid-template-rows:50px minmax(0,1fr);gap:12px;height:100vh;padding:14px;display:grid}.topbar{border:1px solid var(--line);background:var(--surface);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-radius:8px;align-items:center;gap:12px;width:100%;max-width:1380px;height:50px;margin:0 auto;padding:0 14px;display:flex;box-shadow:0 14px 34px #18274b14}.topbar strong{background:var(--blue);color:#fff;border-radius:8px;place-items:center;width:64px;height:34px;font-size:18px;font-weight:900;display:grid}.topbar span{font-size:20px;font-weight:850}.rules-link{color:#98a2b3;cursor:pointer;background:0 0;border:0;margin-left:auto;font-size:12px;font-weight:750}.rules-link:hover{color:var(--blue)}.workspace{grid-template-columns:270px minmax(420px,1fr) 0;gap:12px;width:100%;max-width:1380px;min-height:0;margin:0 auto;transition:grid-template-columns .42s cubic-bezier(.2,.8,.2,1);display:grid}.app.is-solved .workspace{grid-template-columns:270px minmax(420px,1fr) 340px}.input-panel,.stage-panel,.search-panel{border:1px solid var(--line);background:var(--surface);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);border-radius:8px;min-width:0;box-shadow:0 18px 44px #18274b1a}.input-panel{padding:14px;overflow:auto}.panel-title{align-items:center;gap:10px;margin-bottom:10px;display:flex}.panel-title h1{margin:0;font-size:17px}.input-group{background:#fff;border:1px solid #e3eaf4;border-radius:8px;margin-bottom:13px;padding:10px}h2,p{margin:0}.input-group h2{color:var(--blue);margin-bottom:8px;font-size:12px}label{color:var(--muted);gap:5px;margin-bottom:8px;font-size:12px;font-weight:800;display:grid}label:last-child{margin-bottom:0}input{border:1px solid var(--line);background:var(--soft);width:100%;height:34px;color:var(--ink);border-radius:8px;padding:7px 10px}input:focus{border-color:var(--blue);outline:3px solid #2457d624}.state{color:#12865a;font-size:12px;font-weight:850}.state.bad{color:#cf3d3d}.rules-dialog{border:1px solid var(--line);width:min(460px,100vw - 36px);color:var(--ink);background:#fffffff5;border-radius:8px;padding:0;box-shadow:0 24px 60px #18274b38}.rules-dialog::backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0f172a2e}.rules-dialog form{padding:16px}.rules-head{justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px;display:flex}.rules-head h2{color:var(--ink);margin:0;font-size:16px}.rules-head button{color:#98a2b3;cursor:pointer;background:0 0;border:0;font-size:12px;font-weight:800}.rules-dialog p{color:var(--muted);margin-bottom:12px;font-size:12px;line-height:1.55}.rule-list{gap:8px;display:grid}.rule-list div{border-top:1px solid #edf2f7;grid-template-columns:58px minmax(82px,auto) minmax(0,1fr);align-items:center;gap:10px;padding:8px 0;font-size:12px;display:grid}.rule-list span{color:var(--muted);font-weight:850}.rule-list b,.rule-list em{overflow-wrap:anywhere;font-style:normal}.rule-list b{color:var(--ink)}.rule-list em{color:#6b7280;font-family:SFMono-Regular,Consolas,monospace}.stage-panel{cursor:grab;-webkit-user-select:none;user-select:none;touch-action:none;min-height:0;padding:10px;position:relative;overflow:hidden}.stage-panel.is-dragging{cursor:grabbing}.zoom-hint{z-index:2;color:#98a2b3;pointer-events:none;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffb8;border:1px solid #6670851f;border-radius:8px;padding:6px 9px;font-size:12px;font-weight:800;position:absolute;top:16px;right:16px}#diagram{border-radius:8px;width:100%;height:100%;transition:filter .32s,opacity .32s,transform .42s cubic-bezier(.2,.8,.2,1);display:block}#diagram.is-blurring{filter:blur(8px);opacity:.52;transform:scale(.985)}.app.is-solved #diagram{transform:scale(.97)}.bg{fill:#fbfdff}.axis,.axis-arrow{fill:none;stroke:#b7c4d6;stroke-width:1px;stroke-linecap:round;stroke-linejoin:round}.axis-label,.coord-note{fill:#667085;font-size:13px;font-weight:750}.edge{stroke:var(--blue);stroke-width:1.8px;stroke-linecap:round}.pt{fill:var(--blue)}.g{fill:#e06d24}svg text{fill:var(--ink);font-size:17px;font-weight:850}.g-text{fill:#e06d24}.circle-overlay,.line-overlay{fill:#2457d60a;stroke:#2457d69e;stroke-width:1.4px;stroke-dasharray:6 6;animation:.34s both circleIn}.line-overlay{fill:none;stroke:#e06d24c7;stroke-width:2px;stroke-dasharray:7 5}.line-overlay.midline{stroke:#e06d24d1}.circle-overlay.incircle{stroke:#12865aa8;fill:#12865a0a}.circle-overlay.min-cover{stroke:#e06d24b3;fill:#e06d2409}.circle-overlay.excircle{stroke:#7c3aed6b;fill:#7c3aed06}.circle-center{fill:#fff;stroke:currentColor;stroke-width:1.4px}.point-overlay{fill:#111827;stroke:#fff;stroke-width:1.8px}.point-overlay.centroid{fill:#e06d24}.point-overlay.incenter{fill:#12865a}.point-overlay.circumcenter{fill:#2457d6}.point-overlay.orthocenter{fill:#7c3aed}.point-overlay.ninepoint{fill:#64748b}.circle-label{fill:var(--muted);font-size:12px;font-weight:850}.line-label{fill:#e06d24;font-size:12px;font-weight:850}.point-label{fill:#334155;font-size:12px;font-weight:850}.overlay-label{paint-order:stroke;stroke:#fffffff0;stroke-width:5px;stroke-linejoin:round}#diagram.is-interacting .circle-overlay,#diagram.is-interacting .line-overlay{animation:none}.empty-note{fill:var(--muted)}.solve-btn{background:var(--blue);color:#fff;cursor:pointer;opacity:0;pointer-events:none;border:0;border-radius:8px;width:min(220px,100% - 48px);height:46px;font-size:16px;font-weight:900;transition:opacity .26s,transform .26s;position:absolute;bottom:28px;left:50%;transform:translate(-50%,14px);box-shadow:0 16px 30px #2457d642}.solve-btn.is-ready{opacity:1;pointer-events:auto;transform:translate(-50%)}.app.is-solved .solve-btn{opacity:0;pointer-events:none;transform:translate(-50%,12px)}.solve-btn:disabled{background:#aeb8c8}.clear-overlay-btn{width:min(160px,100% - 48px);height:42px;color:var(--blue);cursor:pointer;opacity:0;pointer-events:none;background:#ffffffe6;border:1px solid #2457d62e;border-radius:8px;font-size:14px;font-weight:900;transition:opacity .26s,transform .26s;position:absolute;bottom:28px;left:50%;transform:translate(-50%,12px);box-shadow:0 14px 28px #18274b1f}.clear-overlay-btn.is-ready{opacity:1;pointer-events:auto;transform:translate(-50%)}.search-panel{opacity:0;pointer-events:none;padding:14px;transition:opacity .36s,transform .42s cubic-bezier(.2,.8,.2,1);overflow:auto;transform:translate(28px)}.search-panel.is-open{opacity:1;pointer-events:auto;transform:translate(0)}.search-head{justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px;display:flex}.search-head h1{margin:0;font-size:17px}.search-head button{height:32px;color:var(--blue);cursor:pointer;background:#eef4ff;border:0;border-radius:8px;padding:0 10px;font-size:12px;font-weight:850}.search-row{grid-template-columns:minmax(0,1fr) 64px;gap:8px;margin-bottom:12px;display:grid}.search-input{height:40px}.search-row button{background:var(--blue);color:#fff;cursor:pointer;border:0;border-radius:8px;height:40px;font-size:12px;font-weight:900}.search-results{gap:10px;display:grid}.result-card{background:#fff;border:1px solid #e3eaf4;border-radius:8px;padding:12px;animation:.26s both resultIn}.result-card.is-clickable{cursor:pointer;transition:border-color .18s,box-shadow .18s,transform .18s}.result-card.is-clickable:hover,.result-card.is-clickable:focus{border-color:#2457d659;outline:none;transform:translateY(-1px);box-shadow:0 12px 24px #2457d61a}.result-card h2{color:var(--blue);margin:0 0 9px;font-size:13px}.result-row{grid-template-columns:112px minmax(0,1fr);gap:10px;padding:5px 0;font-size:12px;display:grid}.result-row span{color:var(--muted);font-weight:800}.result-row b{overflow-wrap:anywhere}.empty-result{color:var(--muted);font-size:13px}@keyframes resultIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes circleIn{0%{opacity:0;transform-origin:50%;transform:scale(.985)}to{opacity:1;transform:scale(1)}}@media (width<=980px){body{height:auto;overflow:auto}.app{height:auto;display:block}.topbar{margin-bottom:12px}.workspace,.app.is-solved .workspace{grid-template-columns:1fr}.stage-panel{height:420px}.search-panel{opacity:1;pointer-events:auto;transform:none}}