:root{color-scheme:light;--bg:#fff;--panel:#f6f8fb;--text:#233248;--muted:#617086;--line:#d9e1ea;--blue:#1672b8;--target:#a3afbd;--green:#1c8668;--orange:#c67521;--purple:#8254b9;--focus:#0066b3}
:root[data-theme=dark]{color-scheme:dark;--bg:#171c25;--panel:#1e2632;--text:#e1e8f1;--muted:#a5b4c7;--line:#394656;--blue:#71b9ee;--target:#65778a;--green:#67cbae;--orange:#efb469;--purple:#bea0e6;--focus:#9fd8ff}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;font-size:14px;line-height:1.7}.lab{max-width:1080px;margin:auto;padding:26px}p{margin:8px 0 14px}h1{font-size:25px;line-height:1.4;margin:0 0 10px;letter-spacing:-.3px}h2{font-size:15px;margin:0 0 10px;font-weight:650}.eyebrow{color:var(--blue);font-size:12px;font-weight:650;letter-spacing:.05em;margin:0 0 7px}.intro>p:last-child{max-width:850px;color:var(--muted)}fieldset{border:0;padding:0;margin:0;min-width:0}button{appearance:none;border:1px solid var(--line);border-radius:5px;color:var(--text);background:var(--bg);padding:7px 12px;font:inherit;font-weight:550;cursor:pointer;min-height:38px}button:hover{background:var(--panel)}button.primary{background:var(--blue);color:var(--bg);border-color:var(--blue)}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--focus);outline-offset:3px}input{accent-color:var(--blue)}input[type=checkbox]{width:16px;height:16px;vertical-align:middle;margin:0 5px 1px 0;flex-shrink:0}input[type=range]{height:28px;min-width:0;cursor:pointer;max-width:100%}label{cursor:pointer}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:20px 0 12px}.actions{display:flex;gap:7px;flex-wrap:wrap}#iteration{font-size:12px;font-variant-numeric:tabular-nums;color:var(--muted);white-space:nowrap}.scene-wrap{background:var(--panel);border:1px solid var(--line);border-radius:6px;overflow:hidden}canvas{display:block;width:100%;height:auto}#scene{aspect-ratio:1000/490}.scene-key{display:flex;justify-content:center;flex-wrap:wrap;gap:6px 20px;font-size:12px;color:var(--muted);margin:0;padding:8px 12px 12px}.key::before{content:"";display:inline-block;width:7px;height:7px;margin-right:6px;border-radius:50%;background:var(--blue)}.key.target::before{background:var(--target)}.key.contact::before{background:var(--orange)}.view-controls{display:flex;align-items:center;flex-wrap:wrap;gap:10px 22px;padding:10px 0;color:var(--muted);font-size:12px}.view-controls>label{display:flex;gap:5px;align-items:center}.view-controls input[type=range]{width:105px}.view-controls output{min-width:30px}.status{font-size:13px;min-height:44px;border-left:2px solid var(--blue);padding:5px 10px;margin:0 0 16px;color:var(--text)}.terms{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:16px 0}.term{display:flex;flex-direction:column;min-width:0;gap:6px}.term-title{font-size:14px;font-weight:700}.term-title>span{display:block;font-size:11px;font-weight:400;color:var(--muted);padding-left:23px}.chamfer{--term:var(--green)}.repulsion{--term:var(--orange)}.smooth{--term:var(--purple)}.term-title{color:var(--term)}.term input{accent-color:var(--term)}.formula{font-size:12px;font-family:Georgia,"Times New Roman",serif;line-height:1.8;min-height:41px}.term-detail{font-size:12px;color:var(--muted)}.term output{font-size:12px;font-family:ui-monospace,monospace;font-variant-numeric:tabular-nums}.term:has(input:not(:checked)) .formula,.term:has(input:not(:checked)) .term-detail{opacity:.55}.detail-grid{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);gap:24px;padding:22px 0 10px}.detail-grid p{font-size:12px;color:var(--muted)}#patch{background:var(--panel);border:1px solid var(--line);border-radius:5px;aspect-ratio:620/250}.radius-label{display:flex;justify-content:space-between;font-weight:600}.radius-panel input[type=range]{width:100%;margin:10px 0 0}.radius-panel .kernel{color:var(--text)}.radius-panel button{font-size:12px}.contact-note{font-size:13px;border-top:1px solid var(--line);padding-top:16px;color:var(--muted)}.method{font-size:12px;color:var(--muted)}.method summary{cursor:pointer;color:var(--text);padding:6px 0}.method a{color:var(--blue)}.method p{margin:10px 0}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}#fallback{color:var(--muted)}
@media(max-width:650px){.lab{padding:16px}h1{font-size:21px}.intro>p:last-child{font-size:13px}.toolbar{align-items:flex-start;flex-direction:column;margin-top:15px}.actions{gap:6px}button{font-size:12px;padding:7px 10px}#scene{aspect-ratio:620/520}.view-controls{gap:6px 12px}.terms{gap:10px;grid-template-columns:1fr}.term{display:grid;grid-template-columns:minmax(115px,.8fr) minmax(0,1.2fr);gap:3px 10px;padding:6px 0}.formula{min-height:0;font-size:12px}.term-detail{grid-column:1/-1}.term output{grid-column:1/-1}.term-title{font-size:13px}.term-title>span{display:block;padding-left:23px;font-size:10px}.detail-grid{grid-template-columns:1fr;gap:14px}.scene-key{gap:4px 10px;font-size:10px}.status{font-size:12px}.contact-note{font-size:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.render-note{font-size:11px;color:var(--muted);text-align:center;margin:7px 0 0}.view-controls select{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:4px;max-width:110px}select:focus-visible{outline:3px solid var(--focus);outline-offset:3px}#scene{aspect-ratio:1000/560}.scene-wrap{background:linear-gradient(180deg,var(--bg),var(--panel))}@media(max-width:650px){#scene{aspect-ratio:620/570}.view-controls{gap:8px 14px}}