:root{--ink:#17323b;--muted:#617079;--line:#d1dcdf;--paper:#fbfcfa;--wash:#edf3f3;--accent:#146371;--amber:#8a5727;--mono:ui-monospace,Consolas,monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:20px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 'Segoe UI','Microsoft YaHei',sans-serif}button,input,select{font:inherit}button,a{touch-action:manipulation}button{border:1px solid var(--line);border-radius:6px;padding:7px 12px;background:#fff;color:var(--ink);cursor:pointer;line-height:1.5}button:hover{border-color:var(--accent);background:#f2f8f7}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible,canvas:focus-visible{outline:3px solid #dba45e;outline-offset:3px}button.active,button[aria-selected=true],.primary{background:var(--accent);color:white;border-color:var(--accent)}button:disabled{opacity:.5;cursor:wait}a{color:var(--accent);text-underline-offset:4px}h1,h2,h3,p{margin-top:0}h1{font-size:30px;letter-spacing:-.04em;line-height:1.35;margin-bottom:0}h2{font-size:23px;line-height:1.45}h3{font-size:18px}small,.small{font-size:12px;color:var(--muted)}[hidden]{display:none!important}.site-header,main{max-width:1400px;margin:auto;padding:0 32px}.site-header{display:flex;align-items:center;justify-content:space-between;min-height:64px;border-bottom:1px solid var(--line);gap:18px}.brand{text-decoration:none;font-size:13px;white-space:nowrap}.site-header nav{display:flex;gap:26px;font-size:13px}.site-header nav a{text-decoration:none}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:28px 0 24px}.eyebrow{font:11px/1.5 var(--mono);letter-spacing:.08em;margin:0 0 7px;color:var(--accent)}.heading-note{font-size:13px;color:var(--muted);margin:0}.scheme-tabs{display:grid;grid-template-columns:1.22fr repeat(4,1fr);gap:8px;margin-bottom:14px}.scheme-tabs button{text-align:left;padding:12px 14px;min-width:0}.scheme-tabs small,.scheme-tabs span,.scheme-tabs strong{display:block}.scheme-tabs small{font-size:10px;color:inherit;opacity:.8}.scheme-tabs strong{font-size:16px;margin:3px 0}.scheme-tabs span{font-size:11px;opacity:.85}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:22px;align-items:start}.visual{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:white;min-width:0}.viewer-top{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:9px 12px;border-bottom:1px solid var(--line)}.mode-tabs{display:flex;gap:6px}.mode-tabs button{font-size:12px;padding:5px 10px}.model-status{font-size:10px;color:var(--muted)}.canvas-wrap{height:440px;position:relative;background:#edf3f3}#scene,#overlay{display:block;width:100%;height:100%;position:absolute;inset:0}#scene{touch-action:none;cursor:grab}#overlay{pointer-events:none}.view-note{position:absolute;top:13px;left:14px;font-size:11px;color:var(--muted);max-width:calc(100% - 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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}