:root{color-scheme:dark;--bg:#101719;--surface:#182225;--ink:#e7e9e2;--muted:#a5b0ac;--sand:#d9bd88;--line:#344245;font-family:system-ui,-apple-system,PingFang SC,sans-serif;font-synthesis:none}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink)}button,select,input{font:inherit}button{cursor:pointer;color:inherit;border:1px solid var(--line);background:transparent;min-height:48px;border-radius:4px;touch-action:manipulation}button:hover{background:#233033}button:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--sand);outline-offset:4px}button:disabled{opacity:.5;cursor:wait}main{max-width:560px;margin:auto;height:100svh;min-height:520px;display:flex;flex-direction:column;padding:max(20px,env(safe-area-inset-top)) 24px max(16px,env(safe-area-inset-bottom))}header{display:flex;justify-content:space-between;align-items:flex-start;flex-shrink:0}h1{font:500 28px/1.2 Georgia,Songti SC,"Noto Serif CJK SC",serif;letter-spacing:6px;margin:0}h1 span{font:11px system-ui;letter-spacing:2px;color:var(--muted)}header p{color:var(--muted);font-size:11px;letter-spacing:3px;margin:8px 0 0}.quiet{width:48px;font-size:23px;border-color:transparent}.stage-label{z-index:1;position:absolute;top:20px;left:0;display:flex;align-items:center;gap:7px;color:var(--muted);font-size:10px;letter-spacing:2px;pointer-events:none}.dot{height:4px;width:4px;border-radius:50%;background:var(--sand)}#stage{position:relative;flex:1;min-height:230px;margin-top:8px}canvas{display:block;width:100%;height:100%;position:absolute;inset:0;touch-action:none}.annotation{position:absolute;bottom:5px;left:0;right:0;display:flex;justify-content:space-between;font-size:10px;color:var(--muted);letter-spacing:1px;pointer-events:none;font-variant-numeric:tabular-nums}footer{flex-shrink:0;padding-top:6px;text-align:center}#hint{font-size:11px;color:var(--muted);letter-spacing:1px;margin:12px 0 16px}.controls{display:flex;align-items:center;justify-content:center;gap:18px}.primary{min-width:172px;border-color:var(--sand);color:var(--sand);font-size:13px;letter-spacing:2px}.primary span{font-size:23px;vertical-align:-2px;margin-right:7px}.sensor{border:0;min-height:44px;font-size:11px;letter-spacing:2px;margin-top:10px;color:var(--muted)}.sensor span{margin-left:10px;color:var(--sand)}dialog{border:1px solid var(--line);border-radius:8px;max-width:440px;width:calc(100% - 32px);max-height:calc(100svh - 40px);padding:24px;background:var(--surface);color:var(--ink)}dialog::backdrop{background:#050a0bd9}dialog p{font-size:13px;line-height:1.9;color:var(--muted)}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:8px}h2{font-size:18px;font-weight:500;margin:0}.panel-heading button{font-size:28px;flex-shrink:0}.setting{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:24px 0;font-size:13px}select{background:var(--bg);color:var(--ink);border:1px solid var(--line);padding:10px;min-height:44px;border-radius:4px}input[type=checkbox]{width:24px;height:24px;accent-color:var(--sand);margin:10px}.wide{width:100%;font-size:13px}.small{font-size:11px!important}a{color:var(--sand);font-size:12px;text-underline-offset:4px}#notice{position:fixed;bottom:max(20px,env(safe-area-inset-bottom));left:50%;transform:translate(-50%);background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:12px 16px;font-size:12px;line-height:1.7;width:max-content;max-width:calc(100% - 32px);z-index:5;pointer-events:none;opacity:0;transition:opacity .2s}#notice.visible{opacity:1}#leave{display:none;position:fixed;bottom:max(16px,env(safe-area-inset-bottom));right:16px;font-size:11px;border-color:transparent;color:var(--muted);padding:0 12px}.immersed header,.immersed footer,.immersed .stage-label,.immersed .annotation{visibility:hidden}.immersed #leave{display:block}.immersed main{max-width:800px}.immersed #stage{position:absolute;inset:24px 16px 64px;margin:0}.immersed dialog{visibility:visible}@media(min-width:768px){main{padding-top:40px;padding-bottom:24px;max-width:620px}header p{font-size:12px}h1{font-size:32px}#hint{margin-top:16px}#stage{margin-top:20px}.stage-label{top:24px}.annotation{bottom:16px}}@media(max-height:650px){main{padding-top:max(12px,env(safe-area-inset-top));padding-bottom:max(8px,env(safe-area-inset-bottom))}h1{font-size:23px}header p{margin-top:4px}#hint{margin:6px 0 8px}.sensor{margin-top:0}.stage-label{top:8px}}@media(orientation:landscape)and (max-height:600px){main{min-height:300px;max-width:100%;padding:16px 24px}header{position:absolute;z-index:1;left:max(24px,env(safe-area-inset-left));top:24px}header #settings{margin-left:16px}#stage{margin:0 200px 0 110px}footer{position:absolute;right:max(16px,env(safe-area-inset-right));top:50%;transform:translateY(-50%);width:180px}.controls{gap:2px;flex-wrap:wrap}.primary{order:-1;width:100%;min-width:150px}#hint{line-height:1.8}.stage-label{left:16px}.immersed #stage{inset:16px 80px 16px 16px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}