:root{color-scheme:dark;--bg:#151426;--surface:#19182d;--line:#38334c;--text:#f0ebf7;--muted:#a7a0bb;--gold:#f5c18d;--purple:#aa94e2;font-family:"Microsoft YaHei","PingFang SC",sans-serif;background:var(--bg);color:var(--text);font-synthesis:none}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button{color:inherit;cursor:pointer;background:transparent;border:1px solid var(--line);min-height:44px;font-size:12px}button:hover{border-color:var(--gold);color:var(--gold)}button:focus-visible,a:focus-visible,canvas:focus-visible,input:focus-visible{outline:2px solid var(--gold);outline-offset:4px}.observatory{max-width:1440px;margin:auto;padding:0 48px}.topline{height:72px;display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);font-size:12px;letter-spacing:.05em}.back{display:inline-flex;align-items:center;gap:8px;min-height:44px;font-size:12px;white-space:nowrap}.back>span{font-size:22px}.topline>button{border:0;margin-left:auto;white-space:nowrap;letter-spacing:.05em}.heading{display:flex;justify-content:space-between;align-items:flex-end;gap:25px;padding:30px 0 28px}.eyebrow{color:var(--purple);font-size:12px;line-height:1.6;letter-spacing:1.5px;margin:0 0 10px}h1{margin:0;font-size:clamp(34px,3.8vw,54px);line-height:1.3;font-weight:500;letter-spacing:-1.5px}h1 span{color:var(--gold)}.gesture{font-size:12px;line-height:1.9;color:var(--muted);margin:0 0 4px}.universe{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:28px}.sky-wrap{min-height:480px;position:relative;background:#090b19;border:1px solid var(--line);overflow:hidden}.sky-head{position:absolute;top:21px;left:22px;right:22px;display:flex;justify-content:space-between;z-index:2;font-size:11px;color:#c3bdd0;pointer-events:none}.sky-head i{width:5px;height:5px;display:inline-block;border-radius:50%;background:var(--gold);margin-right:7px}.sky-head>span:last-child{color:var(--gold)}#sky{position:absolute;inset:0;width:100%;height:100%;touch-action:none;cursor:crosshair}.sky-key{position:absolute;bottom:21px;left:22px;display:flex;gap:18px;font-size:10px;color:var(--muted);pointer-events:none}.sky-key i{width:5px;height:5px;display:inline-block;border-radius:50%;margin-right:6px}.gold{background:var(--gold)}.violet{background:var(--purple)}.scale-note{position:absolute;bottom:21px;right:22px;font-size:9px;color:#7a748d;pointer-events:none}.instruments{min-width:0;display:flex;flex-direction:column}.position-head{display:flex;align-items:center;justify-content:space-between;font-size:13px;gap:12px}.align{border:0;color:var(--gold);font-size:12px}.align span{margin-left:7px;font-size:21px}#source-map{display:block;width:100%;height:177px;background:var(--surface);border:1px solid var(--line);touch-action:none;cursor:crosshair}.move-row{display:flex;gap:5px;margin-top:10px}.move-row>button{width:40px;flex:1;font-size:18px}.move-row #offset{font-size:10px;flex:2.3;white-space:nowrap;padding:0 5px}.mass-row{display:flex;justify-content:space-between;align-items:center;font-size:12px;margin-top:22px}.mass-row output{color:var(--gold);font-variant-numeric:tabular-nums}input[type=range]{accent-color:var(--gold);height:44px;width:100%;margin:4px 0 0;cursor:ew-resize}.ruler-ends{display:flex;justify-content:space-between;color:#776e8b;font-size:9px;margin-top:-4px}.observation{display:flex;gap:9px;margin:15px 0 8px;min-height:54px}.observation-dot{width:5px;height:5px;flex-shrink:0;border-radius:50%;background:var(--gold);margin-top:8px}.observation p{font-size:12px;line-height:1.8;margin:0;color:#d2cbdc}.secondary{margin-top:auto;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:8px}.secondary label{font-size:11px;display:flex;align-items:center;min-height:44px;gap:5px;cursor:pointer}.secondary input{accent-color:var(--gold);width:15px;height:15px}.secondary button{border:0;font-size:11px;color:var(--muted)}.path-section{margin-top:26px;padding-top:20px;border-top:1px solid var(--line)}.path-title{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:13px}.path-title>span:last-child{font-size:10px;color:var(--muted)}#ray-diagram{width:100%;height:145px;display:block}.path-section p{color:var(--muted);font-size:11px;line-height:1.8;margin:0}footer{display:flex;justify-content:space-between;gap:12px;font-size:10px;color:#7b728e;border-top:1px solid var(--line);padding:20px 0;margin-top:22px;line-height:1.8}dialog{width:min(580px,calc(100vw - 32px));max-height:85vh;background:#211d34;color:var(--text);border:1px solid #655477;padding:24px 30px}dialog::backdrop{background:#050712bd;backdrop-filter:blur(4px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;color:var(--purple);font-size:12px}.dialog-head button{border:0;min-width:44px;font-size:25px}dialog h2{font-size:24px;line-height:1.6;font-weight:500}dialog h3{font-size:14px;margin-top:25px}dialog p{font-size:12px;line-height:1.9;color:#bcb2cd}dialog a{display:block;font-size:12px;line-height:1.9;color:var(--gold);padding:5px 0}@media(max-width:1000px){.observatory{padding:0 28px}.universe{grid-template-columns:minmax(0,1fr) 260px;gap:20px}.gesture{max-width:220px}.sky-wrap{min-height:440px}.scale-note{display:none}}@media(max-width:760px){.observatory{padding:0 16px}.topline{height:56px;min-height:56px;gap:8px}.topline>button{padding:0;font-size:11px}.back{font-size:12px;letter-spacing:0;gap:5px}.back>span{font-size:20px}.heading{padding:22px 0 17px;display:block}.eyebrow{font-size:11px;margin-bottom:8px}h1{font-size:33px;letter-spacing:-1px}.gesture{font-size:11px;margin:10px 0 0;max-width:none}.gesture br{display:none}.universe{display:flex;flex-direction:column;gap:10px}.sky-wrap{min-height:0;height:clamp(270px,36svh,330px);flex-shrink:0}.sky-head{left:14px;right:14px;top:15px;font-size:10px}.sky-key{left:14px;bottom:14px;font-size:9px;gap:12px}.instruments{display:grid;grid-template-columns:118px minmax(0,1fr);gap:0 14px}.position-head{grid-column:1/-1;font-size:12px}.position-head .align{font-size:11px}#source-map{grid-column:1;grid-row:2/5;height:118px}.mass-row{grid-column:2;grid-row:2;margin:0;align-self:end;font-size:11px}.instruments>input{grid-column:2;grid-row:3;margin:0}.ruler-ends{display:none}.move-row{grid-column:2;grid-row:4;margin:0;gap:4px}.move-row>button{width:28px;min-width:0}.move-row #offset{flex:1.9;font-size:9px;padding:0 2px}.observation{grid-column:1/-1;margin:10px 0 0;min-height:0}.observation p{font-size:11px}.secondary{grid-column:1/-1;margin-top:9px}.path-section{margin-top:19px;padding-top:15px}.path-title{font-size:12px}.path-title>span:last-child{font-size:9px;max-width:155px;text-align:right}.path-section p{font-size:10px}footer{font-size:9px;display:block;margin-top:18px}footer span{display:block}dialog{padding:20px}.dialog-head{font-size:11px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* The position map and sky both respond to direct dragging. */
#source-map,#sky{cursor:grab}