:root{--card-w: clamp(340px, 28vw, 404px);--font: "Inter Tight", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;--ease: cubic-bezier(.22, .8, .24, 1);--spring: cubic-bezier(.2, 1.25, .35, 1);--r-s: 10px;--r-m: 16px;--r-l: 22px}body.look-day{--page: #f5f5f7;--page-2: #ececef;--glass: rgba(255, 255, 255, .78);--glass-strong: rgba(255, 255, 255, .92);--glass-line: rgba(0, 0, 0, .07);--text: #1d1d1f;--text-2: #6e6e73;--text-3: #a1a1a6;--hair: rgba(0, 0, 0, .08);--fill: rgba(0, 0, 0, .05);--fill-2: rgba(0, 0, 0, .09);--accent: #3e8bf0;--accent-ink: #1f6fd6;--accent-soft: rgba(62, 139, 240, .12);--on-accent: #fff;--primary: #1d1d1f;--on-primary: #fff;--good: #1f9d55;--good-soft: rgba(31, 157, 85, .1);--bad: #d93a3a;--bad-soft: rgba(217, 58, 58, .08);--shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 8px 28px rgba(0, 0, 0, .08);--shadow-l: 0 2px 6px rgba(0, 0, 0, .04), 0 24px 64px -12px rgba(0, 0, 0, .18);color-scheme:light}body.look-night{--page: #050506;--page-2: #101013;--glass: rgba(26, 26, 30, .72);--glass-strong: rgba(30, 30, 34, .94);--glass-line: rgba(255, 255, 255, .08);--text: #f5f5f7;--text-2: #98989f;--text-3: #5d5d64;--hair: rgba(255, 255, 255, .09);--fill: rgba(255, 255, 255, .07);--fill-2: rgba(255, 255, 255, .12);--accent: #5aa2ff;--accent-ink: #7db6ff;--accent-soft: rgba(90, 162, 255, .16);--on-accent: #04101f;--primary: #f5f5f7;--on-primary: #0a0a0c;--good: #3ccf7e;--good-soft: rgba(60, 207, 126, .12);--bad: #ff6b6b;--bad-soft: rgba(255, 107, 107, .1);--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);--shadow-l: 0 30px 80px -20px rgba(0, 0, 0, .8);color-scheme:dark}*{box-sizing:border-box}html,body{margin:0}body{background:var(--page);color:var(--text);font:400 16px/1.45 var(--font);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-feature-settings:"ss01","cv11"}button,input,textarea,select{font:inherit;color:inherit}button{cursor:pointer;border:0;background:none;padding:0;-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:8px}a{color:inherit;text-decoration:none}.tnum{font-variant-numeric:tabular-nums}mjx-container{display:inline-block;line-height:0}mjx-container[display=true]{display:block;text-align:center;margin:.6em 0;line-height:0}mjx-container svg{overflow:visible}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:999px;font-weight:600;font-size:16px;letter-spacing:-.005em;transition:transform .2s var(--ease),background .2s,opacity .2s,box-shadow .2s;white-space:nowrap}.btn:active{transform:scale(.97)}.btn.primary{background:var(--primary);color:var(--on-primary)}body.look-day .btn.primary{background:var(--accent);color:#fff}body.look-day .btn.primary:hover{background:var(--accent-ink);opacity:1}.btn.primary:hover{opacity:.88}.btn.accent{background:var(--accent);color:var(--on-accent)}.btn.quiet{background:var(--fill);color:var(--text)}.btn.quiet:hover{background:var(--fill-2)}.btn.link{height:auto;padding:6px 4px;color:var(--text-2);font-weight:500}.btn.link:hover{color:var(--text)}.btn[disabled]{opacity:.35;pointer-events:none}.icon{width:20px;height:20px;display:block;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.icon.fill{fill:currentColor;stroke:none}html,body{height:100%;overflow:hidden;overscroll-behavior:none}#app{position:fixed;inset:0}.glass{background:var(--glass);-webkit-backdrop-filter:saturate(1.6) blur(22px);backdrop-filter:saturate(1.6) blur(22px);box-shadow:0 0 0 .5px var(--glass-line),var(--shadow)}.round{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:var(--text);transition:transform .2s var(--ease),opacity .3s}.round:hover{transform:scale(1.06)}.spacer{flex:1}kbd{font:500 11px/1 var(--font);padding:3px 6px;border-radius:6px;background:var(--fill);color:var(--text-2);margin-left:8px}#stage{position:absolute;inset:0;overflow:hidden;background:#fbfbf8;transition:right .6s var(--ease),bottom .6s var(--ease),top .8s var(--ease),left .8s var(--ease),border-radius .6s var(--ease),transform .9s var(--ease),box-shadow .9s var(--ease)}body.look-day.card-open #stage{right:calc(var(--card-w) + 44px);border-radius:0 22px 22px 0;box-shadow:0 0 0 .5px #0000000f,0 20px 60px -20px #0000002e}body.look-night.card-open #stage{right:calc(var(--card-w) + 80px)}body.look-day.lane.card-open #stage{right:0;border-radius:0;box-shadow:none}body.look-night.lane #stage{right:calc(var(--card-w) + 80px)}body.look-day.lane.card-open #captions{left:calc((100% - var(--card-w) - 44px) / 2)}#board{position:absolute;inset:0}body.look-night #stage{inset:64px 36px 138px;border-radius:18px;box-shadow:0 0 0 1px #ffffff14,0 0 60px #fffaeb0f,0 50px 120px -30px #000000e6}body.look-night #app:before{content:"";position:absolute;inset:-10% -10% 0;pointer-events:none;background:radial-gradient(60% 55% at 50% 42%,#fff6e10f,#fff6e100 70%),radial-gradient(60% 18% at 50% 88%,rgba(255,246,225,.08),transparent 70%)}body.look-night #app:after{content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;mix-blend-mode:overlay;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .05 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>")}#top{position:absolute;top:16px;left:18px;right:18px;display:flex;align-items:center;gap:14px;z-index:30;pointer-events:none;transition:opacity .5s var(--ease),transform .5s var(--ease)}#top>*{pointer-events:auto}#topTitle{display:flex;align-items:baseline;gap:10px;min-width:0;padding:0 4px}#topTopic{font-weight:600;font-size:13px;color:var(--text-2);letter-spacing:.01em}#topName{font-weight:600;font-size:15px;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}body.look-day #top:before{content:"";position:fixed;left:0;right:0;top:0;height:64px;z-index:-1;pointer-events:none;background:#fbfbf8cc;-webkit-backdrop-filter:blur(20px) saturate(1.4);backdrop-filter:blur(20px) saturate(1.4);box-shadow:0 .5px 0 var(--hair)}body.look-day #top{top:12px}body.look-day #backBtn{background:var(--fill);box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none}body.look-day #backBtn:hover{background:var(--fill-2)}#topChapter{height:32px;padding:0 14px;border-radius:16px;display:flex;align-items:center;font-size:13px;font-weight:500;color:var(--text-2);opacity:0;transition:opacity .4s;white-space:nowrap;pointer-events:none}body.look-night #top{top:14px;left:36px;right:36px}body.look-night #backBtn{background:transparent;box-shadow:none}body.look-night #backBtn:hover{background:var(--fill)}body.look-night #topChapter{background:transparent;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none}body.look-day.on-world #top:before{background:#080a1061;box-shadow:none}body.on-world #topName,body.on-world #topChapter{color:#fffffff0}body.look-day.on-world #topChapter{color:var(--text)}body.on-world #topTopic{color:#ffffffa8}body.on-world #backBtn{color:#fff;background:#ffffff24}body.world-wait #playBtn{animation:worldwait 1.6s ease-in-out infinite}@keyframes worldwait{50%{opacity:.45}}#captions{position:absolute;left:50%;bottom:100px;transform:translate(-50%);width:min(980px,calc(100% - 48px));display:flex;justify-content:center;pointer-events:none;z-index:20;transition:opacity .3s,bottom .45s var(--ease)}#captions.off,#captions.empty,body.card-open.card-words #captions,body:has(#scrub:hover) #captions,body:has(#scrub.drag) #captions{opacity:0}body.look-day.card-open #captions{left:calc((100% - var(--card-w) - 44px) / 2);width:min(820px,calc(100% - var(--card-w) - 90px))}body.look-night.card-open #captions{left:calc(36px + (100% - var(--card-w) - 116px) / 2);width:min(820px,calc(100% - var(--card-w) - 150px))}.cap-inner{font:500 21px/1.42 var(--font);letter-spacing:-.005em;text-align:center;padding:9px 18px 10px;border-radius:14px;color:var(--text-3);text-wrap:balance}body.look-day .cap-inner{background:#ffffffdb;-webkit-backdrop-filter:blur(18px) saturate(1.5);backdrop-filter:blur(18px) saturate(1.5);box-shadow:0 0 0 .5px #0000000f,0 6px 24px #00000012;color:#86868b}.cap-inner .w{transition:color .12s;border-radius:5px}.cap-inner .w.said{color:var(--text)}.cap-inner .w.now{color:var(--text);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:5px;text-decoration-color:#1d1d1f47}body.look-night #captions{bottom:78px}body.look-night .cap-inner{font-size:22px;color:#8e8e93;padding:0 12px;text-shadow:0 1px 12px rgba(0,0,0,.6)}body.look-night .cap-inner .w.said{color:#e9e9ee}body.look-night .cap-inner .w.now{color:#fff;background:none;box-shadow:none;text-shadow:0 0 18px rgba(255,255,255,.55)}.cap-inner.feedback .w.said,.cap-inner.feedback .w.now{color:var(--text)}#controls{position:absolute;left:24px;right:24px;bottom:20px;height:60px;border-radius:20px;display:flex;align-items:center;gap:14px;padding:0 12px 0 10px;z-index:30;transition:opacity .5s var(--ease),transform .5s var(--ease)}body.look-night #controls{left:36px;right:36px;bottom:18px;background:transparent;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;padding:0 2px}.play{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--primary);color:var(--on-primary);flex:none;transition:transform .2s var(--ease)}.play:hover{transform:scale(1.06)}.play .icon{width:20px;height:20px}.time{font-size:13px;font-weight:500;color:var(--text-2);min-width:38px;text-align:center}.ctl-group{display:flex;align-items:center;gap:2px}.ctl{height:36px;min-width:36px;padding:0 8px;border-radius:10px;display:grid;place-items:center;color:var(--text-2);font-size:14px;font-weight:600;transition:background .2s,color .2s}.ctl:hover{background:var(--fill);color:var(--text)}.ctl.on{color:var(--text)}#ccBtn:not(.on),#musicBtn:not(.on){opacity:.45}.ctl[hidden]{display:none}#scrub{position:relative;flex:1;height:36px;cursor:pointer;touch-action:none}#segs{position:absolute;left:0;right:0;top:50%;height:4px;margin-top:-2px;display:flex;gap:3px;transition:height .2s var(--ease),margin .2s var(--ease)}#scrub:hover #segs,#scrub.drag #segs{height:7px;margin-top:-3.5px}.seg{position:relative;height:100%;border-radius:4px;background:var(--fill-2);overflow:hidden}.seg i{position:absolute;left:0;top:0;bottom:0;width:0;background:var(--primary);border-radius:inherit}.seg.hover{background:var(--hair)}body.look-night .seg{background:#ffffff29}.mark{position:absolute;top:50%;width:7px;height:7px;margin:-3.5px 0 0 -3.5px;border-radius:50%;background:#fff;box-shadow:0 0 0 1.5px var(--text-3);pointer-events:none;transition:transform .2s var(--ease),background .3s,box-shadow .3s}body.look-night .mark{background:#050506}.mark.done{background:var(--text-2);box-shadow:0 0 0 1.5px var(--text-2);width:6px;height:6px;margin:-3px 0 0 -3px}#scrub:hover .mark{transform:scale(1.25)}#knob{position:absolute;top:50%;width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 2px var(--page),0 1px 4px #0000004d;transform:scale(0);transition:transform .2s var(--ease);pointer-events:none}#scrub:hover #knob,#scrub.drag #knob,#scrub:focus-visible #knob{transform:scale(1)}#tip{position:absolute;bottom:34px;transform:translate(-50%);background:var(--glass-strong);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 0 0 .5px var(--glass-line),var(--shadow);border-radius:12px;padding:7px 11px;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .15s;font-size:13px}#tip img{display:none;width:224px;height:126px;object-fit:cover;border-radius:7px;margin:-2px -6px 7px;background:#fbfbf8;box-shadow:0 0 0 .5px #00000014}#tip.has-thumb{padding:8px 8px 7px}#tip.has-thumb img{display:block;margin:0 0 7px}#tip.has-thumb .tip-row{padding:0 3px;max-width:224px}.tip-row{display:flex;gap:10px;align-items:baseline}#scrub:hover #tip,#scrub.drag #tip{opacity:1}#tip:has(.tip-t:empty){visibility:hidden}.tip-ch{font-weight:600;max-width:236px;white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;flex:1;min-width:0;line-height:1.3}.tip-t{color:var(--text-2);font-weight:500}.menu{position:absolute;z-index:40;border-radius:16px;padding:6px;min-width:120px;opacity:0;transform:translateY(8px) scale(.98);transform-origin:bottom right;pointer-events:none;transition:opacity .2s var(--ease),transform .25s var(--ease);background:var(--glass-strong)}.menu.on{opacity:1;transform:none;pointer-events:auto}.menu button{display:flex;width:100%;align-items:center;gap:12px;padding:9px 12px;border-radius:10px;text-align:left;font-size:14px;font-weight:500}.menu button:hover{background:var(--fill)}.menu button.on{color:var(--accent-ink)}.menu button .ck{width:16px;opacity:0}.menu button.on .ck{opacity:1}#chapMenu{width:340px;max-height:min(520px,calc(100vh - 140px));display:flex;flex-direction:column}.menu-head{font-size:12px;font-weight:600;color:var(--text-2);padding:8px 12px 6px;letter-spacing:.02em}.menu-list{overflow:auto}#chapMenu button{align-items:flex-start}#chapMenu .n{font-weight:600;color:var(--text-3);width:18px;flex:none}#chapMenu .th{width:72px;height:40.5px;border-radius:6px;object-fit:cover;flex:none;background:#fbfbf8;box-shadow:0 0 0 .5px #00000014;margin-top:1px}#chapMenu.thumbs{width:380px}#chapMenu.thumbs button{align-items:center}#chapMenu .tt{flex:1;line-height:1.3}#chapMenu .tm{color:var(--text-3);font-size:12px;font-weight:500;padding-top:2px}#chapMenu button.on .n,#chapMenu button.on .tt{color:var(--accent-ink)}body.idle #controls,body.idle #top{opacity:0;transform:translateY(6px);pointer-events:none}body.idle #top{transform:translateY(-6px)}body.idle{cursor:none}body.look-day.idle:not(.card-open) #captions{bottom:40px}body.look-night.idle:not(.card-open) #captions{bottom:54px}body.look-night.idle #controls{opacity:0}#explore{position:absolute;left:50%;top:12px;transform:translate(-50%,-8px);z-index:32;height:40px;padding:0 6px 0 16px;border-radius:20px;display:flex;align-items:center;gap:10px;font-size:14px;font-weight:500;color:var(--text);background:#ffffffe6;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 0 0 .5px #00000012,0 8px 26px #0000001a;opacity:0;pointer-events:none;transition:opacity .35s var(--ease),transform .45s var(--ease);color:#1d1d1f}#explore.on{opacity:1;transform:translate(-50%);pointer-events:auto}body.look-night #explore{top:12px;background:#ffffff1a;color:#f5f5f7;box-shadow:0 0 0 .5px #ffffff1f}body.look-night #explore .resume{color:#f5f5f7}body.look-night #explore .resume:hover{background:#ffffff14}body.look-night #explore .sep{background:#ffffff24}body.look-night #explore kbd{background:#ffffff1a;color:#a1a1a6}#explore .dot{width:7px;height:7px;border-radius:50%;background:#1d1d1f;opacity:.55}body.look-night #explore .dot{background:#f5f5f7}#explore kbd{display:none}#explore .sep{width:1px;height:18px;background:#0000001a}#explore .resume{height:30px;padding:0 6px 0 12px;border-radius:15px;font-weight:600;display:flex;align-items:center;color:#1d1d1f}#explore .resume:hover{background:#0000000d}#explore kbd{background:#0000000f;color:#6e6e73}#explore .go3d{display:none;white-space:nowrap;flex-shrink:0;height:30px;padding:0 12px;border-radius:15px;font-weight:600;align-items:center;gap:6px;color:#fff;background:#0071e3}#explore .go3d:hover{background:#0077ed}#explore.can3d .go3d{display:flex}#explore.can3d .dot,#explore.can3d .txt{display:none}#explore.can3d{padding-left:6px}body.look-night #explore .go3d{color:#fff}@keyframes breathe{50%{box-shadow:0 0 0 7px transparent;opacity:.6}}#follow{position:absolute;left:50%;top:12px;transform:translate(-50%,-8px);z-index:33;height:40px;padding:0 16px 0 12px;border-radius:20px;display:flex;align-items:center;gap:8px;font-size:14px;font-weight:600;color:var(--text);opacity:0;pointer-events:none;transition:opacity .3s var(--ease),transform .4s var(--ease)}#follow .icon{width:17px;height:17px}#follow.on{opacity:1;transform:translate(-50%);pointer-events:auto}#follow{overflow:hidden}#follow:after{content:"";position:absolute;bottom:0;left:12px;right:12px;height:2px;background:currentColor;opacity:.25;transform-origin:left;transform:scaleX(var(--follow-remaining, 1));pointer-events:none}#calculatorHost{--calc-width: 356px;--calc-bottom: 96px;--calc-right: 24px;--calc-z-index: 45}#calculatorHost.beside-check{--calc-right: var(--calc-check-right, 22px);--calc-width: var(--card-w);--calc-top: var(--calc-check-top, 340px);--calc-bottom: auto}#calculatorHost.beside-check .apcalc{max-height:var(--calc-check-height, calc(100dvh - 436px) )}@media(min-width:761px)and (min-height:521px){#calculatorHost.beside-check .apcalc{left:auto;right:var(--calc-check-right, 22px);top:var(--calc-check-top, 340px);bottom:auto}#calculatorHost.beside-check-row{--calc-width: 356px}#calculatorHost.beside-check .apcalc-move{display:none}#calculatorHost.beside-check .apcalc-header{cursor:default}}@media(max-width:760px),(max-height:520px){#calculatorHost.beside-check{--calc-right: 12px;--calc-left: auto;--calc-width: 356px;--calc-top: auto;--calc-bottom: 96px}#calculatorHost.beside-check .apcalc{max-height:calc(100dvh - 120px)}}body.titling #calculatorHost,body.ended #calculatorHost{--calc-z-index: 70}#calculatorBtn .icon{width:21px;height:21px}body.on-world #calculatorBtn{color:#fff;background:#ffffff24}#zoomControls{position:absolute;right:26px;bottom:92px;z-index:32;padding:3px;border-radius:13px}#zoomControls[hidden]{display:none}body.card-open #zoomControls{right:calc(var(--card-w) + 50px)}body.idle #zoomControls{opacity:0;pointer-events:none}#check .ck-go{position:relative;overflow:hidden;isolation:isolate}#check .ck-go:before{content:"";position:absolute;inset:0;z-index:-1;background:currentColor;opacity:.16;transform:scaleX(var(--continue-progress, 0));transform-origin:left;pointer-events:none}@media(max-width:760px),(max-height:520px){#zoomControls{bottom:112px;right:14px}body.card-open #zoomControls{right:14px;bottom:calc(var(--sheet-h, 240px) + 118px)}}body.look-night #follow{top:12px}#check{position:absolute;right:22px;top:88px;width:var(--card-w);max-height:calc(100% - 196px);overflow:auto;z-index:35;border-radius:22px;padding:18px 20px 14px;background:var(--glass-strong);-webkit-backdrop-filter:saturate(1.6) blur(26px);backdrop-filter:saturate(1.6) blur(26px);box-shadow:0 0 0 .5px var(--glass-line),var(--shadow-l);opacity:0;transform:translate(28px) scale(.98);pointer-events:none;transition:opacity .35s var(--ease),transform .5s var(--spring)}#check.on{opacity:1;transform:none;pointer-events:auto}body.look-night #check{right:40px;top:64px;max-height:calc(100% - 222px)}.ck-grab{display:none}.ck-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.ck-label{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--text-2);letter-spacing:.01em}.ck-label .icon{width:16px;height:16px}.ck-count{font-size:12px;font-weight:500;color:var(--text-3)}.ck-q{font-size:19px;line-height:1.38;font-weight:600;letter-spacing:-.012em;margin-bottom:14px;text-wrap:pretty}.ck-body{display:flex;flex-direction:column}.ck-body>*+*{margin-top:8px}.ck-opt{display:flex;align-items:center;gap:12px;width:100%;padding:12px 14px;border-radius:14px;background:var(--fill);text-align:left;font-size:16px;font-weight:500;line-height:1.3;max-height:160px;overflow:hidden;transition:background .2s,box-shadow .2s,transform .15s var(--ease),opacity .3s,max-height .45s var(--ease),padding .45s var(--ease),margin .45s var(--ease)}.ck-locked .ck-opt.dim{max-height:0;padding-top:0;padding-bottom:0;margin-top:0;opacity:0}.ck-opt:hover{background:var(--fill-2)}.ck-opt:active{transform:scale(.985)}.ck-opt .key{flex:none;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-size:13px;font-weight:600;color:var(--text-2);background:var(--page);box-shadow:0 0 0 .5px var(--hair)}body.look-day .ck-opt .key{background:#fff}.ck-opt .txt{flex:1}.ck-opt .txt{min-width:0;overflow-wrap:anywhere}.ck-option-factors{display:flex;flex-wrap:wrap;align-items:center;gap:8px 4px}.ck-option-factors>span{display:inline-flex;align-items:center;max-width:100%}.ck-option-factors mjx-container>svg{max-width:100%;height:auto}.ck-opt .res{width:20px;height:20px;flex:none;opacity:0}.ck-opt.right{background:var(--good-soft);box-shadow:inset 0 0 0 1.5px var(--good)}.ck-math{display:none;margin:-4px 0 14px;padding:12px 14px;border-radius:14px;background:var(--fill);font-size:17px;overflow-x:auto}.ck-math.on{display:block}.ck-math mjx-container{font-size:112%;max-width:100%}.ck-math mjx-container>svg{max-width:100%;height:auto}body.card-open .nb-world-chip,#check.compact .ck-math{display:none}#check .ck-opt.right .key{background:var(--good);color:#fff;box-shadow:none}.ck-opt.right .res{opacity:1;color:var(--good)}.ck-opt.wrong{background:transparent;box-shadow:inset 0 0 0 1.5px var(--bad)}#check .ck-opt.wrong .key{background:var(--bad);color:#fff;box-shadow:none}.ck-opt.wrong .res{opacity:1;color:var(--bad)}.ck-opt.dim{opacity:.45}.ck-locked .ck-opt{pointer-events:none}.ck-field{display:flex;gap:8px;align-items:center}.ck-input{flex:1;height:50px;border-radius:14px;border:0;background:var(--fill);padding:0 16px;font-size:19px;font-weight:500;outline:none;transition:box-shadow .2s,background .2s;min-width:0}.ck-input:focus{box-shadow:inset 0 0 0 2px var(--accent);background:transparent}.ck-input.right{box-shadow:inset 0 0 0 2px var(--good)}.ck-input.wrong{box-shadow:inset 0 0 0 2px var(--bad)}textarea.ck-input{height:96px;padding:12px 16px;resize:none;font-size:16px;line-height:1.4}.ck-hint{font-size:13px;color:var(--text-3);padding:2px 4px}.ck-preview{min-height:26px;padding:2px 4px;color:var(--text-2);font-size:15px}.ck-preview:empty{display:none}.ck-go[disabled]{background:var(--fill-2)!important;color:var(--text-3)!important;opacity:1}.ck-manip{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:14px;background:var(--fill);color:var(--text);font-weight:500;font-size:15px;line-height:1.4}.ck-manip .pulse{width:8px;height:8px;border-radius:50%;background:var(--text-3);flex:none}.ck-manip.done{background:var(--good-soft);color:var(--good)}.ck-manip.done .pulse{background:var(--good);animation:none;box-shadow:none}.ck-fb{display:none;margin-top:14px;padding:14px 16px;border-radius:16px;font-size:15.5px;line-height:1.45}.ck-fb.on{display:block;animation:rise .45s var(--ease) both}.ck-fb.good{background:var(--good-soft)}.ck-fb.bad,.ck-fb.neutral{background:var(--fill)}.ck-fb .verdict{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px;margin-bottom:4px}.ck-fb.good .verdict{color:var(--good)}.ck-fb.bad .verdict{color:var(--bad)}.ck-fb .verdict .icon{width:18px;height:18px;stroke-width:2.4}.ck-fb .say .w{transition:color .12s}.ck-fb .say .w.todo{color:var(--text-2)}.ck-fb .ans{margin-top:6px;color:var(--text-2);font-size:14px}.ck-foot{display:flex;align-items:center;gap:10px;margin-top:16px}.ck-foot .btn{height:42px}#check .ck-skip.primary{background:#1d1d1f;color:#fff;font-weight:600}#check .ck-skip.primary:hover{background:#1d1d1f;color:#fff}.ck-state{display:none;align-items:center;gap:8px;font-size:13px;font-weight:500;color:var(--text-2)}#check.solving .ck-state{display:flex}#check.compact .ck-body,#check.compact .ck-q{display:none}#check.compact .ck-fb{margin-top:2px}@keyframes rise{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}#titlecard{position:absolute;inset:0;z-index:50;display:flex;align-items:center;transition:opacity .7s var(--ease),visibility 0s .7s;background:var(--page)}#titlecard.gone{opacity:0;visibility:hidden;pointer-events:none;transition:opacity .24s var(--ease),visibility 0s .24s}body:is(.previewing,.title-leaving-preview) #titlecard{background:transparent}body:is(.previewing,.title-leaving-preview) .tc-poster{opacity:0;transition:opacity 1.2s var(--ease)}body:is(.previewing.preview-poster,.title-leaving-preview) #titlecard .tc-poster{opacity:1;left:var(--pv-left);top:var(--pv-top);right:auto;bottom:auto;width:var(--pv-w);height:var(--pv-h);border-radius:22px;transform:none;background-position:center;transition:none}body.titling #stage{z-index:51;opacity:.001;pointer-events:none}body.titling #stage *{pointer-events:none!important}body.titling .nb-world-stage{z-index:30}body.titling .nb-world-box.nb-prewarm{opacity:1!important;z-index:1!important}body.titling .nb-world-box.nb-prewarm>img,body.titling .nb-world-box.nb-prewarm>.nb-world-wait{visibility:hidden}.tc-loop{position:absolute;inset:0;z-index:10;width:100%;height:100%;object-fit:cover;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .3s ease}.tc-loop.on{opacity:1}#titlecard.blink .tc-veil{transition:none}#stage{transform-origin:0 0}body:is(.previewing,.title-leaving-preview) .tc-veil{display:none}body.previewing #stage{transform:translate(var(--pv-x, 0px),var(--pv-y, 0px)) scale(var(--pv-s, 1));border-radius:calc(22px / var(--pv-s, 1))}body.look-day.previewing #stage{box-shadow:0 0 0 calc(.5px / var(--pv-s, 1)) #00000012,0 calc(40px / var(--pv-s, 1)) calc(90px / var(--pv-s, 1)) calc(-30px / var(--pv-s, 1)) #141e3c52}body.look-night.previewing #stage{box-shadow:0 0 0 calc(1px / var(--pv-s, 1)) #ffffff12,0 0 calc(70px / var(--pv-s, 1)) #fffcf01f,0 0 calc(220px / var(--pv-s, 1)) #fffaeb1a}body:is(.previewing,.title-leaving-preview) .tc-body{max-width:min(980px,47vw)}body:is(.previewing,.title-leaving-preview) .tc-title{font-size:clamp(40px,4.7vw,78px);overflow-wrap:normal;-webkit-hyphens:none;hyphens:none}body.previewing :is(.nb-ink-layer,.nb-pen-layer,.nb-pen-html,.nb-halo),body.previewing .nb-ink-layer *,body.previewing .nb-el-html[data-kind=ink],body.previewing .nb-el-html[data-kind=ink] *,body.previewing .nb-scene.nb-telestrator>.nb-html{visibility:hidden!important}body.title-leaving #stage{transition:none;z-index:51;opacity:.001;pointer-events:none}body.title-leaving:not(.opening-reveal) .nb-world-wait{visibility:hidden}body.title-leaving.opening-reveal #stage{z-index:0;opacity:1}body.opening-covered :is(#controls,#topTitle,#topChapter,#captions,#explore){opacity:0!important;pointer-events:none!important}body.title-leaving #titlecard{background:var(--page);pointer-events:none}@media(prefers-reduced-motion:reduce){#titlecard.gone{transition:none}}@media(max-width:760px),(max-height:520px){body:is(.previewing,.title-leaving-preview) .tc-body{max-width:none}}body.titling #controls,body.titling #topTitle,body.titling #topChapter,body.titling #captions,body.titling #explore,body.ended #controls,body.ended #captions,body.ended #explore,body.ended #topChapter,body.ended #topTitle{opacity:0!important;pointer-events:none!important}body.ended #top:before{display:none}.tc-poster{position:absolute;inset:0;isolation:isolate;background-size:cover;background-position:center right}.tc-veil{position:absolute;inset:0}body.look-day .tc-veil{background:linear-gradient(90deg,#fff,#fffffff7 34%,#ffffffb8 58%,#ffffff26),linear-gradient(0deg,#fff,#fff0 45%)}body.look-night .tc-veil{background:linear-gradient(90deg,#050506,#050506f5 34%,#050506b3 60%,#05050640),linear-gradient(0deg,#050506,#05050600 50%)}body.look-night .tc-poster{filter:brightness(.82) contrast(1.04)}.tc-body{position:relative;padding:0 clamp(28px,7vw,112px);max-width:980px}.tc-topic{font-size:15px;font-weight:600;color:var(--text-2);letter-spacing:.01em;margin-bottom:12px;opacity:0;animation:rise .8s var(--ease) .1s both}.tc-title{font-size:clamp(44px,6.6vw,92px);line-height:1.02;font-weight:600;letter-spacing:-.02em;margin:0 0 18px;text-wrap:balance;animation:rise .9s var(--ease) .18s both}.tc-sub{font-size:clamp(17px,1.5vw,21px);line-height:1.4;color:var(--text-2);margin:0 0 30px;max-width:640px;text-wrap:pretty;animation:rise .9s var(--ease) .26s both}.tc-sub:empty{display:none}.tc-actions{display:flex;align-items:center;gap:18px;animation:rise .9s var(--ease) .34s both}.tc-begin{height:52px;padding:0 30px 0 24px;font-size:17px}.tc-begin[disabled]{opacity:.35;pointer-events:none}.tc-begin{position:relative;touch-action:manipulation;-webkit-tap-highlight-color:transparent}.tc-begin.tc-starting,.tc-begin.tc-queued{pointer-events:none}.tc-begin.tc-starting .icon,.tc-begin.tc-queued .icon{opacity:0}.tc-begin.tc-starting:before,.tc-begin.tc-queued:before{content:"";position:absolute;left:24px;top:50%;width:14px;height:14px;margin-top:-9px;border-radius:50%;border:2px solid currentColor;border-right-color:transparent;animation:tc-turn .8s linear infinite}@keyframes tc-turn{to{transform:rotate(360deg)}}body:not(.world-wait) .nb-world-box.nb-wait>img{display:block;position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1;pointer-events:none;opacity:1!important;filter:none;transform:none}body:not(.world-wait) .nb-world-box.nb-wait>.nb-world-wait{display:none}.tc-begin[disabled] .icon{animation:breathe 1.4s ease-in-out infinite}.tc-begin .icon{width:18px;height:18px}.tc-len{font-size:15px;font-weight:500;color:var(--text-2)}#practice{position:absolute;inset:0;z-index:45;background:var(--page);opacity:0;visibility:hidden;transition:opacity .5s var(--ease),visibility 0s .5s}#practice.on{opacity:1;visibility:visible;transition:opacity .5s var(--ease)}.pr-scroll{position:absolute;inset:0;overflow:auto;overscroll-behavior:contain}.pr-col{max-width:780px;margin:0 auto;padding:72px 28px 96px}.pr-close{position:absolute;top:18px;left:18px}.pr-head{margin-bottom:30px}.pr-kicker{font-size:14px;font-weight:600;color:var(--text-2);margin-bottom:6px}.pr-head h2{font-size:36px;line-height:1.08;font-weight:600;letter-spacing:-.02em;margin:0;text-wrap:balance}#practice mjx-container{font-size:92%}.pr-item{background:var(--glass-strong);border-radius:22px;padding:24px 26px 22px;margin-bottom:18px;box-shadow:0 0 0 .5px var(--hair),var(--shadow)}body.look-day .pr-item{background:#fff}body.look-night .pr-item{background:#131316}.pr-meta{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:13px;font-weight:600;color:var(--text-2)}.pr-badge{display:inline-flex;align-items:center;gap:5px;height:24px;padding:0 9px 0 7px;border-radius:12px;background:var(--fill);font-size:12px;font-weight:600;color:var(--text-2)}.pr-badge .icon{width:15px;height:15px}.pr-badge.calc{background:var(--accent-soft);color:var(--accent-ink)}.pr-stim{margin:0 0 16px;padding:14px 16px;border-radius:14px;background:var(--fill);display:grid;gap:12px;justify-items:start}.pr-stim-text{font-size:16px;line-height:1.5;color:var(--text)}.pr-stim img{max-width:100%;max-height:320px;border-radius:10px;background:#fff}.pr-stim table{border-collapse:collapse;font-variant-numeric:tabular-nums;font-size:15.5px}.pr-stim th,.pr-stim td{padding:7px 16px;text-align:center;border-bottom:.5px solid var(--hair)}.pr-stim th{font-weight:600;color:var(--text-2);border-bottom:1px solid var(--fill-2)}.pr-stim tr>:first-child{border-right:1px solid var(--fill-2)}.pr-stim tr:last-child td{border-bottom:0}.pr-stem{font-size:17.5px;line-height:1.5;margin-bottom:16px;text-wrap:pretty}.pr-opts{display:grid;gap:8px}.pr-opt{display:flex;gap:12px;align-items:center;width:100%;padding:12px 14px;border-radius:14px;background:transparent;box-shadow:inset 0 0 0 1px var(--hair);text-align:left;font-size:16px;line-height:1.4;transition:background .2s,box-shadow .2s,opacity .3s}.pr-opt:hover{background:var(--fill)}.pr-opt .key{flex:none;width:28px;height:28px;border-radius:9px;display:grid;place-items:center;font-size:13px;font-weight:600;color:var(--text-2);background:var(--page);box-shadow:0 0 0 .5px var(--hair)}body.look-day .pr-opt .key{background:#fff}.pr-opt .txt{flex:1}.pr-opt.right{background:var(--good-soft);box-shadow:inset 0 0 0 1.5px var(--good)}#practice .pr-opt.right .key{background:var(--good);color:#fff;box-shadow:none}.pr-opt.wrong{background:var(--bad-soft);box-shadow:inset 0 0 0 1.5px var(--bad)}#practice .pr-opt.wrong .key{background:var(--bad);color:#fff;box-shadow:none}.pr-opt.dim{opacity:.5}.pr-item.answered .pr-opt{pointer-events:none}.pr-explain{display:none;margin-top:14px;padding:14px 16px;border-radius:14px;background:var(--fill);font-size:15.5px;line-height:1.5}.pr-item.answered .pr-explain{display:block;animation:rise .4s var(--ease) both}.pr-explain .verdict{font-weight:700;margin-bottom:4px}.pr-explain .verdict.good{color:var(--good)}.pr-explain .verdict.bad{color:var(--bad)}.pr-part{border-top:.5px solid var(--hair);padding-top:16px;margin-top:16px}.pr-part:first-of-type{border-top:0;margin-top:0;padding-top:0}.pr-part .lbl{font-weight:700;margin-right:6px}.pr-part .prompt{font-size:16.5px;line-height:1.5;margin-bottom:10px}.pr-part textarea{width:100%;min-height:84px;border:0;border-radius:14px;background:var(--fill);padding:12px 14px;font-size:15.5px;line-height:1.45;resize:vertical;outline:none}.pr-part textarea:focus{box-shadow:inset 0 0 0 2px var(--accent)}.pr-part .reveal{margin-top:8px}.pr-model{display:none;margin-top:10px;border-radius:14px;background:var(--good-soft);padding:14px 16px;font-size:15.5px;line-height:1.5}.pr-model.on{display:block;animation:rise .4s var(--ease) both}.pr-model h4{margin:0 0 4px;font-size:13px;font-weight:700;color:var(--good)}.pr-model .pts{margin-top:10px;padding-top:10px;border-top:.5px solid var(--hair);color:var(--text-2);font-size:14.5px}.pr-model .pts h4{color:var(--text-2)}.pr-foot{display:flex;align-items:center;justify-content:space-between;margin-top:28px}.pr-score{font-size:15px;font-weight:500;color:var(--text-2)}#final{position:absolute;inset:0;z-index:40;pointer-events:none}.fn-card{position:absolute;left:28px;bottom:28px;width:min(440px,calc(100% - 56px));border-radius:24px;padding:22px 24px 20px;opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease) .5s,transform .8s var(--spring) .5s}#final.on{pointer-events:none}#final.on .fn-card{opacity:1;transform:none;pointer-events:auto}body.look-day .fn-card,body.look-day .fn-terms{background:#fff}.fn-topic{font-size:13px;font-weight:600;color:var(--text-2);margin-bottom:4px}.fn-title{font-size:26px;line-height:1.12;font-weight:600;letter-spacing:-.02em;margin-bottom:8px;text-wrap:balance}.fn-stats{font-size:14px;color:var(--text-2);margin-bottom:18px}.fn-stats:empty{display:none}.fn-actions{display:flex;flex-wrap:wrap;gap:8px}.fn-actions .btn{height:42px;padding:0 18px;font-size:15px}.fn-actions .icon{width:18px;height:18px}.fn-nextname{margin:0 0 14px;font-size:15px;font-weight:600;letter-spacing:-.01em}.fn-nextname span{display:block;font-size:12px;font-weight:500;color:var(--text-3);margin-bottom:2px;letter-spacing:0}.fn-terms{position:absolute;right:28px;bottom:28px;width:min(380px,calc(100% - 56px));max-height:calc(100% - 120px);overflow:auto;border-radius:24px;padding:18px 8px 10px;opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease) .7s,transform .8s var(--spring) .7s}#final.on .fn-terms{opacity:1;transform:none;pointer-events:auto}.fn-terms h3{margin:0 14px 8px;font-size:13px;font-weight:600;color:var(--text-2)}.fn-term{display:block;width:100%;text-align:left;padding:9px 14px 10px;border-radius:14px;transition:background .2s}.fn-term:hover{background:var(--fill)}.fn-term b{display:block;font-size:15px;font-weight:600;letter-spacing:-.01em;margin-bottom:2px}.fn-term b:first-letter{text-transform:uppercase}.fn-term span{display:block;font-size:13.5px;line-height:1.4;color:var(--text-2)}.fn-terms:empty{display:none}.fn-nextname:empty{display:none}#topChapter .n{color:var(--accent-ink);font-weight:600;margin-right:8px;display:none}#topChapter.announce{opacity:1!important;color:var(--text);background:var(--glass-strong);box-shadow:0 0 0 .5px var(--glass-line),var(--shadow)}#topChapter.announce .n{display:inline}body.look-night #topChapter.announce{background:#ffffff14}body.idle #top.announcing{opacity:1;transform:none}body.idle #top.announcing>:not(#topChapter){opacity:0}#topChapter{transition:opacity .4s,background .4s,color .4s}#toast{position:absolute;left:50%;top:70px;transform:translate(-50%,-6px);z-index:60;padding:9px 14px;border-radius:12px;background:var(--glass-strong);box-shadow:0 0 0 .5px var(--glass-line),var(--shadow);font-size:14px;font-weight:500;opacity:0;transition:opacity .25s,transform .3s var(--ease);pointer-events:none}#toast.on{opacity:1;transform:translate(-50%)}body.booting #controls,body.booting #topTitle,body.booting #captions,body.titling #controls,body.titling #captions{opacity:0}body.titling #top{z-index:60}body.titling #top:before{display:none}body.shot #top,body.shot #controls,body.shot #explore,body.shot #titlecard,body.shot #toast{display:none!important}body.shot.nocap #captions{display:none}body.nopen .nb-pen-layer,body.nopen .nb-pen-html,body.nopen .nb-pen{display:none!important}@media(max-width:760px),(max-height:520px){#controls{left:0;right:0;bottom:0;height:calc(58px + env(safe-area-inset-bottom));padding:0 10px env(safe-area-inset-bottom) 8px;border-radius:0;gap:10px}.play{width:38px;height:38px}#tEnd,#muteBtn,#fullBtn{display:none}.ctl{min-width:32px;padding:0 5px}#captions{bottom:calc(68px + env(safe-area-inset-bottom));width:calc(100% - 20px)}.cap-inner{font-size:16.5px;padding:7px 12px 8px}#top{top:10px;left:10px;right:10px}#topChapter{display:none}#check{inset:auto 0 0;translate:none;width:auto;max-height:62%;border-radius:22px 22px 0 0;padding:8px 18px calc(14px + env(safe-area-inset-bottom));transform:translateY(40px)}body.look-day.card-open #stage,body.look-night.card-open #stage{right:0;bottom:var(--sheet-h, 50%);border-radius:0;box-shadow:none}body.card-open #controls{opacity:0;pointer-events:none}body.look-day.card-open #captions,body.look-night.card-open #captions{left:50%;width:calc(100% - 20px);bottom:calc(var(--sheet-h, 50%) + 10px)}#check.on{transform:none}.ck-grab{display:block;width:38px;height:5px;border-radius:3px;background:var(--fill-2);margin:0 auto 10px}.ck-q{font-size:17px}.tc-body{padding:0 22px 40px}#titlecard{align-items:flex-end}#titlecard .tc-poster{inset:64px 14px auto;height:calc((100vw - 28px)*.5625);border-radius:18px;background-size:cover;background-position:center;transform:none!important;box-shadow:0 0 0 .5px #00000012,0 20px 50px -20px #141e3c4d}#titlecard .tc-veil{display:none}body.look-night #titlecard .tc-poster{box-shadow:0 0 0 1px #ffffff12,0 0 50px #fffaeb1a;filter:none}.pr-col{padding:64px 16px 80px}.pr-head h2{font-size:34px}.pr-item{padding:18px 16px}#chapMenu{width:calc(100% - 20px);right:10px!important;left:10px!important}body.look-night #stage{inset:0;border-radius:0}body.look-night #controls{background:#050506db;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);padding:0 10px env(safe-area-inset-bottom) 8px;left:0;right:0;bottom:0}body.look-night #check{right:0;bottom:0;translate:none}body.look-night #captions{bottom:calc(68px + env(safe-area-inset-bottom))}body.look-night .cap-inner{background:#050506cc;padding:7px 12px 8px;border-radius:12px;font-size:16.5px}.fn-card{left:12px;right:12px;bottom:12px;width:auto}.fn-terms{display:none}}body.paused:not(.titling):not(.ended):not(.shot) #controls{opacity:1;transform:none;pointer-events:auto}.ck-stay[hidden]{display:none}.ck-stay{white-space:nowrap}#final:not(.on) .fn-card,#final:not(.on) .fn-terms{visibility:hidden;transition:none}#practice:not(.on){transition:none}.live-explore-chip{position:fixed;z-index:45;left:50%;bottom:142px;transform:translate(-50%);border:1px solid var(--glass-border,rgba(100,110,135,.2));border-radius:999px;padding:10px 20px;color:var(--ink,#242734);background:var(--glass-bg,rgba(250,250,252,.94));font:600 13px/1.25 Inter,system-ui,sans-serif;box-shadow:0 3px 16px #0f14231a;cursor:pointer}.live-explore-chip[hidden]{display:none}.live-explore-chip:disabled{cursor:wait}body.card-open .live-explore-chip{bottom:calc(var(--sheet-h,240px) + 20px)}body.phone-video #stage{transition-duration:.35s}@media(orientation:landscape)and (max-height:520px){body.phone-profile.card-open #stage{right:calc(min(38vw,320px) + 12px);bottom:0}body.phone-profile #check{inset:6px 6px 6px auto;width:min(38vw,320px);max-height:calc(100% - 12px);translate:none;border-radius:18px;padding:12px 16px;transform:translate(30px)}body.phone-profile #check.on{transform:none}body.phone-profile #check .ck-grab{display:none}body.phone-profile.card-open #zoomControls{right:calc(min(38vw,320px) + 24px);bottom:76px}body.phone-profile.card-open #top{top:4px;left:8px;right:calc(min(38vw,320px) + 20px);gap:8px}body.phone-profile.card-open #top:before{height:48px;right:calc(min(38vw,320px) + 12px)}body.phone-profile.card-open #topChapter{display:none}body.phone-profile.card-open.on-world.paused:not(.titling):not(.ended):not(.shot) #controls{opacity:0;pointer-events:none}@media(max-height:339px){body.phone-profile.card-open #top{display:none}}}#lessonRecovery{position:fixed;z-index:80;left:50%;bottom:82px;transform:translate(-50%);width:max-content;max-width:calc(100vw - 32px);padding:12px 16px;border-radius:14px;color:#1d1d1f;background:var(--paper,#f5f5f7);box-shadow:0 2px 18px #0002;font:500 14px/1.4 system-ui;text-align:center}#lessonRecovery[hidden]{display:none}#lessonRecovery button{display:block;margin:8px auto 0;min-height:44px;padding:8px 18px;border:0;border-radius:10px;background:#205d9b;color:#fff;font:600 15px system-ui}#lessonRecovery button[hidden]{display:none}body.look-night #lessonRecovery{color:#f5f5f7;background:#16181b;box-shadow:0 2px 18px #0008}.phone-profile.lesson-held #explore,.phone-profile.lesson-held #follow,.phone-profile.lesson-held .live-explore-chip{visibility:hidden}body.phone-profile #check .ck-opt{max-height:none;overflow:visible;flex-shrink:0}body.phone-profile #check .ck-opt .txt{min-width:0;overflow-wrap:anywhere}body.phone-profile #check.ck-locked .ck-opt.dim{display:none}body.phone-profile #check .ck-q{font-size:1.0625rem;overflow-wrap:anywhere}body.phone-profile #check .ck-opt{font-size:1rem}body.phone-profile #check .ck-fb,body.phone-profile #check .ck-manip{font-size:1rem;overflow-wrap:anywhere}body.phone-profile #check .ck-input{font-size:1.0625rem;min-height:2.75em;height:auto}body.phone-profile #check .ck-foot{flex-wrap:wrap}body.phone-profile #check .ck-foot .btn{height:auto;min-height:44px;white-space:normal}body.phone-profile #check .ck-q mjx-container,body.phone-profile #check .ck-opt mjx-container{max-width:100%;overflow-x:auto}@media(prefers-reduced-motion:reduce){body.phone-profile #check,body.phone-profile #check *,body.phone-profile #stage,body.phone-profile #follow{transition:none!important;animation:none!important;scroll-behavior:auto!important}}body.phone-profile.phone-rotating #stage,body.phone-profile.phone-rotating #stage *{pointer-events:none!important}body.phone-profile.titling #calculatorHost{visibility:hidden;pointer-events:none}@media(prefers-reduced-motion:reduce){body.phone-profile .nb-card,body.phone-profile .nb-inst,body.phone-profile .nb-invite-ribbon{transition:none!important;animation:none!important}}@media(orientation:landscape)and (max-height:520px){body.phone-profile #titlecard{align-items:center}body.phone-profile #titlecard .tc-poster{inset:64px auto auto 14px;width:calc(48vw - 21px);height:calc((48vw - 21px)*.5625)}body.phone-profile #titlecard .tc-body{margin-left:48vw;padding:18px 22px;max-width:none;flex:1}body.phone-profile #titlecard .tc-topic{margin-bottom:8px}body.phone-profile #titlecard .tc-title{font-size:clamp(25px,4.2vw,40px);margin-bottom:12px}body.phone-profile #titlecard .tc-sub{font-size:14px;margin-bottom:14px}body.phone-profile #titlecard .tc-begin{height:44px}}#stageRecoveryNotice{position:fixed;z-index:85;left:50%;bottom:calc(112px + env(safe-area-inset-bottom,0px));transform:translate(-50%);max-width:min(460px,calc(100vw - 32px));padding:9px 14px;border-radius:12px;background:#fbfbf8f5;color:#292b30;box-shadow:0 2px 18px #0002;font:13px/1.4 var(--ui,system-ui);text-align:center;pointer-events:none}#stageRecoveryNotice[hidden]{display:none}#stageRecoveryNotice.can-cancel{display:flex;align-items:center;gap:12px;background:#123b69;color:#fff;pointer-events:auto}#stageRecoveryNotice.can-cancel button{min-height:44px;padding:8px 14px;border:1px solid #ffffff8c;border-radius:10px;background:#ffffff14;color:#fff;font:600 14px/1.2 var(--ui,system-ui);cursor:pointer}#stageRecoveryNotice:empty{display:none}#graphicsNotice{position:absolute;z-index:85;top:calc(var(--sv-y,0px) + 12px);left:50%;transform:translate(-50%);display:flex;align-items:center;gap:12px;width:max-content;max-width:min(560px,calc(100% - 24px));box-sizing:border-box;padding:12px 14px;border-radius:14px;background:#123b69;color:#fff;box-shadow:0 4px 24px #0003;font:15px/1.45 var(--ui,system-ui)}#graphicsNotice button{flex:none;min-height:44px;padding:8px 12px;border:1px solid #ffffff8c;border-radius:10px;color:#fff;background:#ffffff14;font:600 14px/1.2 var(--ui,system-ui);cursor:pointer}#graphicsNotice button:focus-visible{outline:3px solid #fff;outline-offset:3px}#explore3d[hidden]{display:none!important}#check .ck-graphics-required{margin:0;padding:12px 14px;border-radius:12px;background:#e9f2ff;color:#123b69;font-size:16px;line-height:1.5}@media(max-width:480px){#graphicsNotice{align-items:flex-start;gap:8px;font-size:14px}#graphicsNotice button{padding-inline:8px}}#stage.nb-stage-input-owned{pointer-events:auto!important}#stage.nb-stage-input-owned iframe{pointer-events:none!important}#settingsBtn .icon{transition:transform .18s var(--ease)}#settingsBtn[aria-expanded=true]{background:var(--fill);color:var(--text)}#settingsBtn[aria-expanded=true] .icon{transform:rotate(30deg)}.sm{position:absolute;z-index:56;width:296px;overflow:hidden;border-radius:16px;color:var(--text);background:#fffffff7;-webkit-backdrop-filter:saturate(1.6) blur(26px);backdrop-filter:saturate(1.6) blur(26px);box-shadow:0 0 0 .5px var(--glass-line),0 14px 44px #00000029;opacity:0;transform:translateY(6px) scale(.98);transform-origin:bottom right;pointer-events:none;transition:opacity .16s var(--ease),transform .18s var(--ease),height .18s var(--ease)}body.look-night .sm{background:#1e1e22f7;box-shadow:0 0 0 .5px var(--glass-line),0 18px 50px #0009}.sm.on{opacity:1;transform:none;pointer-events:auto}.sm:not(.sheet){margin-right:env(safe-area-inset-right)}.sm:focus{outline:none}.sm.no-anim,.sm.no-anim .sm-panel{transition:none!important}.sm-panel{position:absolute;left:0;top:0;width:100%;padding:6px;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;transition:transform .18s var(--ease),opacity .18s var(--ease)}.sm-panel[data-at=left]{transform:translate(-100%);opacity:0}.sm-panel[data-at=right]{transform:translate(100%);opacity:0}.sm-row{display:flex;align-items:center;gap:12px;width:100%;min-height:44px;padding:0 12px;border-radius:10px;font:500 15px/1.2 var(--font);color:var(--text);text-align:left;white-space:nowrap;transition:background .12s}@media(hover:hover){.sm-row:hover,.sm-size:hover{background:var(--fill)}}.sm-row:focus{outline:none}.sm-row:focus-visible{background:var(--fill-2);box-shadow:inset 0 0 0 2px var(--accent)}.sm-row .lb{flex:1;min-width:0}.sm-row .ic{width:20px;height:20px;flex:none}.sm-row .val{font-size:14px;font-weight:500}.sm-row .val .sub,.sm-row .sub{font-weight:400}.sm-row .chev{width:16px;height:16px;flex:none;margin-right:-4px;stroke-width:2;opacity:.55}.sm-back{font-weight:600;gap:8px;padding-left:8px;margin-bottom:4px}.sm-back .chev.back{margin:0;opacity:1}.sm-row .ck{width:18px;height:18px;flex:none;stroke-width:2.3;opacity:0}.sm-row[aria-checked=true] .ck{opacity:1}.sm-row[role=menuitemradio][aria-checked=true] .lb{font-weight:600}.sm-row .tag{font-size:11px;font-weight:600;letter-spacing:.02em;padding:2px 5px;border-radius:5px;background:var(--fill-2)}.sm-row .sw{position:relative;width:38px;height:22px;flex:none;border-radius:11px;background:var(--fill-2);transition:background .18s var(--ease)}.sm-row .sw i{position:absolute;left:2px;top:2px;width:18px;height:18px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #00000040;transition:transform .18s var(--ease)}.sm-row[aria-checked=true] .sw{background:var(--accent)}.sm-row[aria-checked=true] .sw i{transform:translate(16px)}.sm-label{display:flex;align-items:center;min-height:34px;padding:6px 12px 0;font:500 15px/1.2 var(--font)}.sm-label .lb{flex:1}.sm-label .val{font-size:14px;font-weight:400}.sm-seg{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;margin:6px;padding:4px;border-radius:12px;background:var(--fill)}.sm-size{height:40px;border-radius:9px;display:grid;place-items:center;color:var(--text);font-family:var(--font);font-weight:500;line-height:1;transition:background .15s,box-shadow .15s}.sm-size:focus{outline:none}.sm-size:focus-visible{box-shadow:inset 0 0 0 2px var(--accent)}.sm-size[aria-checked=true]{background:#fff;box-shadow:0 0 0 .5px #0000000f,0 1px 4px #00000024;font-weight:600}.sm-size[aria-checked=true]:focus-visible{box-shadow:inset 0 0 0 2px var(--accent),0 1px 4px #00000024}body.look-night .sm-size[aria-checked=true]{background:#fff3;box-shadow:none}.sm-size.s-s{font-size:13px}.sm-size.s-m{font-size:16px}.sm-size.s-l{font-size:19.5px}.sm-size.s-xl{font-size:23px}.sm-grab{width:36px;height:5px;border-radius:3px;background:var(--fill-2);margin:2px auto 8px}body.settings-open #zoomControls{opacity:0;visibility:hidden;pointer-events:none;transition:opacity .12s,visibility 0s .12s}#settingsScrim{position:absolute;inset:0;z-index:55;pointer-events:none;background:#0000004d;opacity:0;transition:opacity .2s var(--ease)}#settingsScrim.on{opacity:1}.sm.sheet{left:0;right:0;bottom:0;width:auto;border-radius:20px 20px 0 0;transform:translateY(100%);transform-origin:bottom center;background:#fff;-webkit-backdrop-filter:none;backdrop-filter:none;padding-bottom:env(safe-area-inset-bottom);box-shadow:0 0 0 .5px var(--glass-line),0 -10px 40px #0000002e;transition:opacity .2s var(--ease),transform .24s var(--ease),height .18s var(--ease)}.sm.sheet.on{transform:none}.sm.sheet.dragging{transition:none}.sm.sheet .sm-panel{padding:8px 10px 10px}.sm.sheet .sm-row{min-height:52px;font-size:17px;padding:0 14px}.sm.sheet .sm-row .val{font-size:16px}.sm.sheet .sm-label{font-size:17px;padding:8px 14px 0}.sm.sheet .sm-label .val{font-size:16px}.sm.sheet .sm-size{height:48px}.sm.sheet .sm-back{padding-left:10px}body.look-night .sm.sheet{background:#1c1c1f}@media(prefers-reduced-motion:reduce){.sm,.sm-panel,#settingsBtn .icon,#settingsScrim,.sm-row .sw,.sm-row .sw i{transition:none!important}}#captions{--cap-k: 1;--cap-base: 21px}body.cap-s #captions{--cap-k: .8}body.cap-l #captions{--cap-k: 1.2}body.cap-xl #captions{--cap-k: 1.45}body.look-night #captions{--cap-base: 22px}#captions .cap-inner{font-size:calc(var(--cap-base) * var(--cap-k))}body:is(.cap-s,.cap-l,.cap-xl) #captions .cap-inner{padding:calc(9px * var(--cap-k)) calc(18px * var(--cap-k)) calc(10px * var(--cap-k))}body.look-night:is(.cap-s,.cap-l,.cap-xl) #captions .cap-inner{padding:0 12px}@media(max-width:760px),(max-height:520px){body #captions,body.look-night #captions{--cap-base: 16.5px}body:is(.cap-s,.cap-l,.cap-xl) #captions .cap-inner,body.look-night:is(.cap-s,.cap-l,.cap-xl) #captions .cap-inner{padding:calc(7px * var(--cap-k)) calc(12px * var(--cap-k)) calc(8px * var(--cap-k))}}body.stage-mode[data-stage-class=wide] #captions{max-width:calc(var(--sv-w) - 24px)}body.stage-mode[data-stage-class=wide]:not(.card-open) #captions{left:calc(var(--sv-x) + var(--sv-w) / 2)}@media(max-height:520px){body.stage-mode[data-stage-class=wide].card-open #captions{--ck-right: calc(18px + min(29vw, 240px)) ;left:calc(var(--ck-right) + (min(100%,var(--sv-x) + var(--sv-w)) - var(--ck-right)) / 2)!important;width:calc(min(100%,var(--sv-x) + var(--sv-w)) - var(--ck-right) - 12px)!important;max-width:none!important;bottom:calc(68px + env(safe-area-inset-bottom))!important;top:auto!important}}body.stage-mode[data-stage-class=tall] #captions{--cap-base: 16px}body.stage-mode[data-stage-class=tall] #captions .cap-inner{line-height:1.25}body.stage-mode[data-stage-class=tall]:is(.cap-s,.cap-l,.cap-xl) #captions .cap-inner{padding:0}body.stage-mode[data-stage-class=tall]:is(.cap-l,.cap-xl) #captions{top:auto!important;bottom:calc(72px + env(safe-area-inset-bottom))!important;height:auto;align-items:flex-end}body.stage-mode[data-stage-class=tall]:is(.cap-l,.cap-xl) #captions .cap-inner{background:#fbfbf8;border-radius:10px;padding:4px 8px}#captions.preview{opacity:1!important}body.settings-sheet:not(.cap-preview) #captions{opacity:0}body.cap-preview.settings-open:not(.settings-sheet) #captions{left:calc((max(var(--sv-x, 0px),0px) + var(--sm-x, 100vw)) / 2)!important;width:min(980px,calc(var(--sm-x, 100vw) - max(var(--sv-x, 0px),0px) - 32px))!important;max-width:none!important}body.cap-preview.settings-sheet #captions{bottom:calc(var(--sm-h, 240px) + 14px)!important;top:auto!important;z-index:57}body.settings-open .live-explore-chip{visibility:hidden}#studyRail{--study-height: calc(100dvh - 188px) ;display:none;position:fixed;z-index:45;top:88px;right:22px;bottom:100px;width:var(--card-w);max-height:var(--study-height);overflow:hidden;padding:2px;gap:12px}#studyRail.on{display:flex;flex-direction:column}#studyRail>#check{position:relative;inset:auto;width:100%;max-height:none;flex:0 1 auto;min-height:0;display:flex;flex-direction:column;overflow:hidden;transform:none}.ck-prompt{display:contents}#studyRail .ck-prompt{display:flex;flex-direction:column;flex:0 1 auto;min-height:var(--question-height, 0px);overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}#studyRail .ck-q{flex:none}#studyRail .ck-math{flex:none;overflow-x:auto}#studyRail .ck-math mjx-container[display=true]{margin:0}#studyRail #check>:not(.ck-prompt){flex-shrink:0}#studyRail #check.has-options>.ck-body{flex:0 1 auto;min-height:54px;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}#studyRail #check.has-options .ck-opt{flex-shrink:0}#studyRail>#calculatorHost{display:flex;flex-direction:column;flex:none;min-height:0}#studyRail .apcalc{position:relative;inset:auto!important;width:100%;min-height:0;max-height:none;flex:none;transform:none!important}#studyRail .apcalc.scientific,#studyRail .apcalc:has(.apcalc-history:not([hidden])){max-height:var(--calculator-height, 378px)}#studyRail .apcalc-scroll{overflow:auto}#calculatorHost .apcalc-move{display:none}#calculatorHost .apcalc-header{cursor:default}#calculatorHost .apcalc-functions{grid-template-columns:repeat(4,minmax(0,1fr))}#calculatorHost .apcalc:not(.scientific) .apcalc-functions>:not([data-action=backspace]):not([data-action=clear]):not([data-action=power]):not([data-fn=sqrt]){display:none}#calculatorHost .apcalc.scientific .apcalc-functions{grid-template-columns:repeat(6,minmax(0,1fr))}#calculatorHost .calc-scientific{min-height:32px;padding:0 4px;font-size:12px;color:var(--_muted)}#calculatorHost .apcalc-header{gap:6px;padding:2px 12px}#calculatorHost .apcalc-header .apcalc-history-toggle,#calculatorHost .apcalc-header .apcalc-close{min-height:36px;height:36px}#calculatorHost .apcalc-tape-heading:empty{display:none}body.look-day.calculator-open:not(.titling):not(.ended) #stage{right:0;border-radius:0}@media(max-width:760px),(max-height:520px){#studyRail{--study-height: calc(100dvh - 144px) ;inset:auto 8px 68px;width:auto;border-radius:20px}#studyRail>#check{translate:none;border-radius:20px}#studyRail .apcalc{border-radius:20px}body.calculator-open.card-open #stage{bottom:0}}#calculatorHost .apcalc:not(.scientific) .apcalc-tape-hint,#calculatorHost .apcalc:not(.scientific) .apcalc-pretty,#calculatorHost .apcalc:not(.scientific):not(.apcalc-invalid) .apcalc-hint{display:none}#calculatorHost .apcalc:not(.scientific) .apcalc-work{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:6px 12px;margin-bottom:6px}#calculatorHost .apcalc:not(.scientific) .apcalc-work>label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}#calculatorHost .apcalc:not(.scientific) .apcalc-input{flex:1;min-width:80px;width:50%;font-size:21px}#calculatorHost .apcalc:not(.scientific) .apcalc-input::placeholder{font-size:15px}#calculatorHost .apcalc:not(.scientific) .apcalc-functions{margin-bottom:6px}#calculatorHost .apcalc:not(.scientific) .apcalc-functions>button{height:36px}#calculatorHost .apcalc:not(.scientific) .apcalc-keypad button{height:40px}#calculatorHost .apcalc-footer{padding:6px 16px}#calculatorHost .apcalc .apcalc-use{height:36px}#calculatorHost .apcalc:not(.scientific) .apcalc-header{padding-top:2px;padding-bottom:0}#calculatorHost .apcalc:not(.scientific) .apcalc-result{font-size:25px}#calculatorHost .apcalc:not(.scientific) .apcalc-result-row{padding:2px 0}@media(max-height:900px){#studyRail{gap:8px;--calculator-height: 288px}#studyRail>#check{padding:10px 16px}#studyRail .ck-input{height:44px}#studyRail .ck-foot{margin-top:8px}#studyRail .ck-foot .btn{height:36px}#calculatorHost .apcalc:not(.scientific) .apcalc-scroll{padding:0 12px 6px}#calculatorHost .apcalc:not(.scientific) .apcalc-scroll{display:grid;grid-template-columns:minmax(0,1fr) 52px;column-gap:6px}#calculatorHost .apcalc:not(.scientific) .apcalc-work{grid-column:1 / -1;grid-row:1}#calculatorHost .apcalc:not(.scientific) .apcalc-keypad{grid-column:1;grid-row:2}#calculatorHost .apcalc:not(.scientific) .apcalc-functions{grid-column:2;grid-row:2;grid-template-columns:1fr;gap:4px;margin:0}#calculatorHost .apcalc:not(.scientific) .apcalc-history{grid-column:1 / -1;grid-row:1}#calculatorHost .apcalc:not(.scientific):has(.apcalc-history:not([hidden])) .apcalc-work{grid-row:2}#calculatorHost .apcalc:not(.scientific):has(.apcalc-history:not([hidden])) :is(.apcalc-keypad,.apcalc-functions){grid-row:3}#calculatorHost .apcalc:not(.scientific) .apcalc-work{padding:2px 8px;margin-bottom:4px}#calculatorHost .apcalc:not(.scientific) .apcalc-input{height:32px}#calculatorHost .apcalc:not(.scientific) .apcalc-functions>button{height:36px}#calculatorHost .apcalc:not(.scientific) .apcalc-keypad{gap:4px}#calculatorHost .apcalc:not(.scientific) .apcalc-keypad button{height:36px}#calculatorHost .apcalc:not(.scientific) .apcalc-footer{padding:4px 12px}#calculatorHost .apcalc:not(.scientific) .apcalc-use{height:32px}}@media(min-width:761px)and (max-width:1400px){#studyRail{width:400px}}@media(max-height:800px){#studyRail{--study-height: calc(100dvh - 148px) ;top:64px;bottom:84px}#studyRail>#check{padding-top:8px;padding-bottom:8px}#studyRail .ck-head{margin-bottom:4px}#studyRail .ck-q{font-size:17px;margin-bottom:6px}#studyRail .ck-math{font-size:16px;padding:2px 10px;margin:0 0 4px}#studyRail .ck-foot{margin-top:4px}}@media(max-width:760px)and (max-height:800px){#studyRail{--study-height: calc(100dvh - 120px) ;top:auto;bottom:68px}}@media(max-height:700px){#studyRail{--calculator-height: 268px}#studyRail .ck-q{font-size:16px}#calculatorHost .apcalc:not(.scientific) .apcalc-keypad button,#calculatorHost .apcalc:not(.scientific) .apcalc-functions>button{height:32px}#calculatorHost .apcalc:not(.scientific) .apcalc-header button{min-height:32px;height:32px}}#check{display:flex;flex-direction:column;overflow:hidden}#check .ck-head,#check .ck-foot{flex:none}#check .ck-content{flex:1 1 auto;min-height:0;overflow:auto;overscroll-behavior:contain;scrollbar-gutter:stable;scrollbar-width:thin}#studyRail #check>.ck-content{flex:1 1 auto;min-height:0}#check[data-kind=numeric][data-phase=asking] .ck-content{display:flex;flex-direction:column}#check[data-kind=numeric][data-phase=asking] .ck-body{flex:none}#studyRail #check[data-kind=numeric][data-phase=asking] .ck-prompt{flex:1 1 auto;min-height:0;overflow:auto;scrollbar-gutter:stable;scrollbar-width:thin}#check .ck-content:focus-visible,#check .ck-prompt:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}#check .ck-content::-webkit-scrollbar{width:6px}#check .ck-content::-webkit-scrollbar-thumb{background:var(--text-3);border-radius:4px}#check .ck-content::-webkit-scrollbar-track{background:var(--fill);border-radius:4px}#check .ck-foot{position:relative;z-index:1;margin-top:10px}#check .ck-opt:not(.dim){max-height:none;overflow:visible;flex-shrink:0}#check .tex-pending{visibility:hidden}#topTopic{flex:none;white-space:nowrap}#topTitle{flex:1}body.explore-on #topTitle{max-width:calc(50vw - 180px)}@media(orientation:landscape)and (max-height:520px){body.phone-profile #check{width:min(54vw,480px);top:56px;bottom:12px;max-height:calc(100% - 68px)}body.phone-profile #check .ck-q{margin-bottom:8px}body.phone-profile #check[data-choice-grid=true] .ck-body{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}body.phone-profile #check[data-choice-grid=true] .ck-opt{margin:0;padding:8px;gap:6px}body.phone-profile #check[data-choice-grid=true] .ck-opt .res{width:14px}body.phone-profile.card-open #stage{right:calc(min(54vw,480px) + 12px)}body.phone-profile #app>#explore,body.phone-profile #app>#follow{top:6px!important;bottom:auto}body.phone-profile.explore-on:not(.card-open) #topTitle{max-width:calc(50vw - 182px)}}.seg b{position:absolute;left:0;top:0;bottom:0;width:0;background:#00000024;border-radius:inherit;transition:width .25s linear}body.look-night .seg b{background:#ffffff4d}#scrub.no-buffer .seg b{display:none}#spin{position:absolute;left:50%;top:50%;z-index:14;width:72px;height:72px;margin:-36px 0 0 -36px;border-radius:50%;pointer-events:none;background:#10101294;-webkit-backdrop-filter:blur(12px) saturate(1.2);backdrop-filter:blur(12px) saturate(1.2);box-shadow:0 6px 24px #00000029;opacity:0;transform:scale(.92);transition:opacity .18s var(--ease),transform .24s var(--ease)}#spin.on{opacity:1;transform:none}#spin svg{position:absolute;left:14px;top:14px;width:44px;height:44px;overflow:visible}#spin circle{fill:none;stroke-width:3.6;stroke-linecap:round}#spin .sp-track{stroke:#ffffff38}#spin .sp-arc{stroke:#fff;stroke-dasharray:125.7;stroke-dashoffset:94;transform-origin:24px 24px;animation:sp-turn 1s linear infinite,sp-arc 1.5s var(--ease) infinite alternate}#spin:not(.on) .sp-arc{animation-play-state:paused}@keyframes sp-turn{to{transform:rotate(360deg)}}@keyframes sp-arc{0%{stroke-dashoffset:110}to{stroke-dashoffset:52}}@media(prefers-reduced-motion:reduce){#spin .sp-arc{animation:sp-turn 2.4s linear infinite}#spin{transition:opacity .18s;transform:none}}@media(max-width:760px),(max-height:520px){#spin{width:64px;height:64px;margin:-32px 0 0 -32px}#spin svg{left:12px;top:12px;width:40px;height:40px}}@media(orientation:landscape)and (max-height:520px){body.phone-profile #studyRail.on{inset:56px 6px 68px auto;width:min(76vw,660px);max-height:calc(100dvh - 124px);flex-direction:row;align-items:stretch;gap:8px}body.phone-profile #studyRail>#check{width:54%!important;min-width:0;flex:1 1 54%;max-height:100%}body.phone-profile #studyRail>#calculatorHost{width:46%;min-width:0;flex:1 1 46%}body.phone-profile #studyRail .apcalc{width:100%;max-height:100%}body.phone-profile #studyRail .apcalc-header h2{font-size:13px}body.phone-profile #studyRail .apcalc-header{display:grid;grid-template-columns:minmax(0,1fr) auto 32px;gap:0 6px;padding:2px 8px}body.phone-profile #studyRail .apcalc-mark{display:none}body.phone-profile #studyRail .apcalc-header h2{grid-column:1 / 3;grid-row:1;min-width:0}body.phone-profile #studyRail .apcalc-close{grid-column:3;grid-row:1;margin:0;width:32px}body.phone-profile #studyRail .apcalc-history-toggle{grid-column:1;grid-row:2;justify-self:start}body.phone-profile #studyRail .calc-scientific{grid-column:2 / 4;grid-row:2;justify-self:end}body.phone-profile #studyRail .calc-scientific{font-size:11px}body.phone-profile #studyRail .apcalc-footer>span{display:none}body.phone-profile #studyRail .ck-head{font-size:12px}body.stage-mode[data-stage-class=wide].phone-profile #studyRail.on{inset:56px 6px 68px auto!important;width:min(76vw,660px)!important;max-height:calc(100dvh - 124px)!important}body.stage-mode[data-stage-class=wide].phone-profile #studyRail>#check{width:54%!important;flex:1 1 54%;min-height:0}}body.phone-profile.card-open:not(.titling):not(.ended):not(.shot) #controls{opacity:1;transform:none;pointer-events:auto}@media(orientation:landscape)and (max-height:520px){body.phone-profile #studyRail .apcalc-close{grid-row:1 / 3;align-self:start}body.phone-profile #studyRail .calc-scientific{grid-column:2}body.phone-profile #studyRail .apcalc-scroll{padding-bottom:2px}body.phone-profile #studyRail .apcalc-footer{padding:2px 12px}body.phone-profile #studyRail .apcalc .apcalc-use{height:32px}body.phone-profile #studyRail .apcalc:not(.scientific) .apcalc-input{height:30px}body.phone-profile #studyRail .apcalc:not(.scientific) .apcalc-work{padding:3px 8px;margin-bottom:4px}}@media(orientation:landscape)and (max-height:520px){body.phone-profile #studyRail .apcalc:not(.scientific) .apcalc-scroll{padding-bottom:0}body.phone-profile #studyRail .apcalc:not(.scientific) .apcalc-footer{padding:0 8px}body.phone-profile #studyRail .apcalc:not(.scientific) .apcalc-work{padding:0 8px;margin-bottom:2px}body.phone-profile #studyRail .apcalc:not(.scientific) .apcalc-input{height:32px}}@media(orientation:portrait)and (max-width:760px){body.phone-profile #app>#explore,body.phone-profile #app>#follow{top:52px!important;bottom:auto;height:36px}}@media(max-width:760px),(max-height:520px){body.phone-profile.card-open #check:not(#studyRail #check){bottom:68px!important}body.phone-profile #studyRail #check .ck-grab{display:none}body.phone-profile #check[data-kind=numeric][data-phase=asking] .ck-math{flex:none}body.phone-profile #check[data-kind=numeric][data-phase=asking] .ck-q{min-height:0;overflow:auto}body.phone-profile #studyRail #check[data-kind=numeric][data-phase=asking] .ck-prompt{display:grid;grid-template-rows:minmax(1.4em,1fr) auto;overflow:visible}body.phone-profile #studyRail #check[data-kind=numeric][data-phase=asking] .ck-q{min-height:1.4em;margin-bottom:4px;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin}}@media(orientation:landscape)and (max-height:520px){body.phone-profile.card-open #check:not(#studyRail #check){max-height:calc(100dvh - 124px)!important}}@media(orientation:portrait)and (max-width:760px){body.phone-profile #studyRail .apcalc.inline-use .apcalc-work{position:relative;padding-right:108px}body.phone-profile #studyRail .apcalc.inline-use:not(.scientific) .apcalc-work{flex-wrap:nowrap}body.phone-profile #studyRail .apcalc.inline-use:not(.scientific) .apcalc-input{flex:1 1 0;min-width:0;width:0}body.phone-profile #studyRail .apcalc.inline-use:not(.scientific) .apcalc-result-row{flex:none;min-width:0;gap:6px}body.phone-profile #studyRail .apcalc.inline-use:not(.scientific) .apcalc-result{font-size:18px;max-width:110px;overflow-x:auto;white-space:nowrap}body.phone-profile #studyRail .apcalc.inline-use .apcalc-footer{position:absolute;right:4px;top:50%;transform:translateY(-50%);padding:0;border:0}body.phone-profile #studyRail .apcalc.inline-use .apcalc-footer>span{display:none}body.phone-profile #studyRail .apcalc.inline-use .apcalc-use{width:100px;padding:0 6px;height:32px;min-height:32px}}@media(orientation:landscape)and (max-height:520px){body.phone-profile #check[data-kind=numeric][data-phase=asking]{padding-top:4px;padding-bottom:4px}body.phone-profile #check[data-kind=numeric][data-phase=asking] .ck-head{margin-bottom:2px}body.phone-profile #check[data-kind=numeric][data-phase=asking] .ck-foot{margin-top:0}body.phone-profile #check[data-kind=numeric][data-phase=asking] .ck-q{min-height:1.4em;margin-bottom:4px}body.phone-profile #check[data-kind=numeric][data-phase=asking] .ck-math{padding-top:2px;padding-bottom:2px;margin-top:0;margin-bottom:4px}}body.glass-lite.look-day{--lite-glass: rgba(255, 255, 255, .9);--lite-glass-strong: rgba(255, 255, 255, .97)}body.glass-lite.look-night{--lite-glass: rgba(26, 26, 30, .86);--lite-glass-strong: rgba(30, 30, 34, .97)}body.glass-lite :is(.glass,.cap-inner,#controls,#tip,#explore,#check,#calculatorHost .apcalc,.nb-world-chip,.nb-card.dark,.c-bar,.c-screen .now,.w-take,.w-back,.w-title,.w-takes,.w-tray-btn,.w-chips,.w-toast),body.glass-lite #top:before{-webkit-backdrop-filter:none;backdrop-filter:none}body.glass-lite .glass{background:var(--lite-glass)}body.glass-lite.look-day :is(.fn-card,.fn-terms){background:#fff}body.glass-lite .menu,body.glass-lite #tip,body.glass-lite #check{background:var(--lite-glass-strong)}body.glass-lite.look-day #top:before{background:#fbfbf8f0}body.glass-lite.look-day.on-world #top:before{background:#080a108f}body.glass-lite.look-day .cap-inner{background:#fffffff0}body.glass-lite #explore{background:#fffffff5}body.glass-lite.look-night #explore{background:#ffffff1f}body.glass-lite #calculatorHost{--calc-bg: rgba(255, 255, 255, .97)}body.glass-lite.look-night #calculatorHost{--calc-bg: rgba(26, 28, 35, .97)}body.glass-lite .nb-world-chip{background:#080a12de}body.glass-lite .nb-card.dark{background:#12141efa}body.glass-lite .c-bar{background:#000000f7}body.glass-lite .c-screen .now{background:#fffffff0}body.glass-lite .w-take{background:#0000009e}body.glass-lite :is(.w-back,.w-title,.w-takes,.w-tray-btn){background:#141418c7}body.glass-lite .w-chips{background:#141418f5}body.glass-lite .w-toast{background:#141418db}@media(max-width:760px),(max-height:520px){body.glass-lite.look-night #controls{background:#050506f2}}body.ink-glow .nb-vector-outline{display:none!important}body.ink-glow .nb-scene.nb-telestrator>svg.nb-ink-layer,body.ink-glow .nb-scene.nb-telestrator>.nb-html{filter:drop-shadow(0 0 1.6px rgba(0,0,0,.92)) drop-shadow(0 2px 7px rgba(0,0,0,.55))}body.ink-glow .nb-scene.nb-telestrator.nb-telestrator-light>svg.nb-ink-layer,body.ink-glow .nb-scene.nb-telestrator.nb-telestrator-light>.nb-html{filter:drop-shadow(0 0 1.6px rgba(255,255,255,.95)) drop-shadow(0 1px 6px rgba(255,255,255,.7))}body.ink-glow .nb-scene.nb-telestrator>.nb-html{text-shadow:none}body.phone-profile,body.phone-profile *,body.phone-profile:before,body.phone-profile:after,body.phone-profile *:before,body.phone-profile *:after,body.phone-profile *::backdrop{-webkit-backdrop-filter:none!important;backdrop-filter:none!important;-webkit-filter:none!important;filter:none!important}body.stage-mode,body.stage-mode #app{background:#fbfbf8!important}body.stage-mode #stage{inset:auto!important;left:var(--sv-x)!important;top:var(--sv-y)!important;width:var(--sv-w)!important;height:var(--sv-h)!important;border-radius:0!important;box-shadow:none!important;transition:none!important;transform:none!important}body.stage-mode #board{inset:0 auto auto 0!important}.stage-video-plane{position:absolute;left:0;top:0;width:var(--sv-css-w);height:var(--sv-css-h);transform:translate(var(--sv-plane-x),var(--sv-plane-y)) scale(var(--sv-plane-s));transform-origin:0 0;pointer-events:none}.stage-video{position:absolute;inset:0;z-index:12;pointer-events:none;background:var(--sv-edge, #fbfbf8);transition:opacity .18s linear}.stage-video-picture,.stage-video-still{position:absolute;inset:0;width:100%;height:100%;object-fit:fill}.stage-video-still{pointer-events:none}body.stage-mode[data-stage-class=tall] #captions{top:var(--sv-cap)!important;bottom:auto!important;left:50%!important;width:min(980px,calc(100% - 24px))!important}body.stage-mode[data-stage-class=tall] #explore{bottom:auto!important;top:calc(var(--sv-y) + 12px)}body.stage-mode #check{top:64px;right:12px;max-height:calc(100% - 154px)}body.stage-mode[data-stage-class=tall] #check{position:absolute!important;inset:auto 8px 76px!important;width:auto!important;max-height:42vh!important;border-radius:18px!important;translate:none!important}body.stage-mode[data-stage-class=tall] #studyRail{position:static}body.stage-mode #check.on{transform:none!important}body.stage-mode[data-stage-class=tall] #zoomControls{right:calc(100% - var(--sv-x) - var(--sv-w) + 10px);bottom:auto;top:calc(var(--sv-y) + 52px)}body.stage-mode.handoff #stage{opacity:1!important}body.stage-mode[data-stage-class=wide] #studyRail>#check{position:relative!important;inset:auto!important;width:100%!important;max-height:100%;translate:none}@media(max-height:520px){body.stage-mode[data-stage-class=wide] #studyRail,body.stage-mode[data-stage-class=wide] #app>#check{inset:56px auto 12px 8px!important;width:min(54vw,480px)!important;max-height:calc(100dvh - 68px)!important}body.stage-mode[data-stage-class=wide] #studyRail{overflow-y:auto}body.stage-mode[data-stage-class=wide] #studyRail>#check{flex:none;min-height:120px}}body.stage-mode #board{contain:strict}body.stage-mode.stage-passive #board{content-visibility:hidden}body.stage-mode[data-stage-class=wide],body.stage-mode[data-stage-class=wide] #app{background:var(--sv-edge, #fbfbf8)!important}body.stage-mode[data-stage-class=wide] #stage{background:var(--sv-edge,#fbfbf8)}.stage-hover-host{position:absolute;left:var(--sv-plane-x);top:var(--sv-plane-y);width:calc(var(--sv-css-w) * var(--sv-plane-s));height:calc(var(--sv-css-h) * var(--sv-plane-s));pointer-events:none;z-index:13}body.stage-mode[data-stage-class=tall] #top{--onw: 0 !important}body.stage-mode[data-stage-class=tall] #topName{color:var(--text)}body.stage-mode[data-stage-class=tall] #topTopic,body.stage-mode[data-stage-class=tall] #topChapter{color:var(--text-2)}body.stage-mode[data-stage-class=tall] #backBtn,body.stage-mode[data-stage-class=tall] #calculatorBtn{color:var(--text);background:var(--fill)}body.stage-mode[data-stage-class=tall]{--text: #1d1d1f;--text-2: #29292c;--text-3: #343438}body.stage-mode[data-stage-class=tall] #top{top:calc(4px + env(safe-area-inset-top));left:8px;right:8px;height:44px;gap:8px;opacity:1;transform:none;pointer-events:auto}body.stage-mode[data-stage-class=tall] #top:before{height:calc(52px + env(safe-area-inset-top));background:#fbfbf8;-webkit-backdrop-filter:none;backdrop-filter:none}body.stage-mode[data-stage-class=tall] #top>.spacer{display:none}body.stage-mode[data-stage-class=tall] #topTitle{flex:1;gap:8px}body.stage-mode[data-stage-class=tall] #topName{font-size:14px}body.stage-mode[data-stage-class=tall] #topChapter{display:none}body.stage-mode[data-stage-class=tall] #backBtn{width:44px;height:44px}body.stage-mode[data-stage-class=tall] #explore{width:max-content;max-width:calc(var(--sv-w) - 24px);height:44px;white-space:nowrap}body.stage-mode[data-stage-class=tall] #explore button{min-height:44px}body.stage-mode[data-stage-class=tall] #zoomControls{top:calc(var(--sv-y) + 64px)}body.stage-mode[data-stage-class=tall] #zoomControls .ctl{min-width:44px;min-height:44px}body.stage-mode[data-stage-class=tall] #captions{height:60px;align-items:flex-start;transition:opacity .15s}body.stage-mode[data-stage-class=tall] .cap-inner{font-size:16px;line-height:20px;padding:0;color:#1d1d1f;background:none;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;border-radius:0}body.stage-mode[data-stage-class=tall] .cap-inner .w{color:#1d1d1f}body.stage-mode[data-stage-class=tall] .cap-inner .w.now{text-decoration-color:#1d1d1f}body.stage-mode[data-stage-class=tall] #controls{left:8px;right:8px;bottom:env(safe-area-inset-bottom);height:68px;padding:20px 0 4px;border-radius:0;gap:8px;background:#fbfbf8;box-shadow:none;-webkit-backdrop-filter:none;backdrop-filter:none;opacity:1;transform:none;pointer-events:auto}body.stage-mode[data-stage-class=tall] #scrub{position:absolute;top:0;left:4px;right:4px;height:24px}body.stage-mode[data-stage-class=tall] #controls .play{width:44px;height:44px}body.stage-mode[data-stage-class=tall] #controls .ctl{min-width:44px;height:44px;padding:0 6px;color:#1d1d1f}body.stage-mode[data-stage-class=tall] #controls .ctl-group{margin-left:auto;gap:0}body.stage-mode[data-stage-class=tall] #tEnd,body.stage-mode[data-stage-class=tall] #fullBtn{display:none}body.stage-mode[data-stage-class=tall] #muteBtn{display:grid}body.stage-mode[data-stage-class=tall] #musicBtn{display:none}body.stage-mode[data-stage-class=tall] #ccBtn:not(.on){opacity:1;text-decoration:line-through}body.stage-mode[data-stage-class=tall] #check{bottom:var(--sv-sheet-bottom, calc(74px + env(safe-area-inset-bottom)) )!important;max-height:min(52vh,var(--sv-sheet-max, 100vh),calc(100% - 142px))!important;background:#fff;padding:12px 14px;color:#1d1d1f;-webkit-backdrop-filter:none;backdrop-filter:none}body.stage-mode[data-stage-class=tall] #check .ck-grab{display:none}body.stage-mode[data-stage-class=tall] #check .ck-foot{position:sticky;bottom:-12px;padding:8px 0;margin-top:6px;background:#fff}body.stage-mode[data-stage-class=tall] #check .ck-foot .btn{min-height:44px}body.stage-mode[data-stage-class=tall] #check .ck-q{font-size:16px;margin-bottom:8px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking]{max-height:calc(100% - 132px)!important}@media(max-height:600px){body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking]{max-height:calc(100% - 132px)!important;padding:8px 10px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-head{margin-bottom:4px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-q{font-size:14.5px;line-height:18px;margin-bottom:5px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-math{padding:5px 8px;margin:0 0 5px;font-size:14px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-body{flex:none;overflow:visible;min-height:0}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-opt{min-height:36px;padding:5px 8px;gap:8px;font-size:14px;line-height:17px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-opt+.ck-opt{margin-top:4px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-opt .key{width:24px;height:24px}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-foot{position:static;margin-top:4px;padding:0}body.stage-mode[data-stage-class=tall] #check.has-options[data-phase=asking] .ck-foot .btn{height:36px;min-height:36px}}body.stage-mode[data-stage-class=tall] #check.has-options[data-choice-grid=true][data-phase=asking] .ck-body{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;flex:none!important;overflow:visible!important}body.stage-mode[data-stage-class=tall] #check.has-options[data-choice-grid=true][data-phase=asking] .ck-opt{margin:0!important;min-width:0;padding:5px 8px;gap:8px}body.stage-mode[data-stage-class=tall] #check.has-options[data-choice-grid=true][data-phase=asking] .ck-opt .res{display:none}body.stage-mode[data-stage-class=tall] #check.has-options[data-choice-grid=true][data-phase=asking] .ck-opt:last-child:nth-child(odd){grid-column:1 / -1}body.stage-mode[data-stage-class=tall] #check.has-options[data-choice-grid=true][data-phase=asking] .ck-opt .txt{min-width:0}body.stage-mode[data-stage-class=tall] #check.has-options[data-choice-grid=true][data-phase=asking] mjx-container>svg{max-width:100%;height:auto}body.stage-mode[data-stage-class=tall] input::placeholder,body.stage-mode[data-stage-class=tall] textarea::placeholder{color:#343438;opacity:1}body.stage-mode[data-stage-class=tall] #calculatorHost{--calc-text: #1d1d1f;--calc-muted: #343438;--calc-bg: #fff}body.stage-mode[data-stage-class=tall] .apcalc button:disabled{opacity:1;color:#343438;background:#e6e6e6}body.stage-mode[data-stage-class=tall] #ccBtn.on{background:#e6e6e6}body.stage-mode[data-stage-class=tall] #speedMenu,body.stage-mode[data-stage-class=tall] #chapMenu{bottom:calc(74px + env(safe-area-inset-bottom))!important}.ck-question-toggle{display:none}body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking] .ck-question-toggle{display:block;min-height:44px;padding:0 8px;font-size:14px;font-weight:600;color:#1d1d1f;text-decoration:underline;text-underline-offset:3px}body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking][data-stage-expanded=false]{display:grid;grid-template-columns:1fr auto;align-items:center;padding:4px 8px;overflow:visible}body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking][data-stage-expanded=false] .ck-head{margin:0;gap:4px}body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking][data-stage-expanded=false] .ck-label,body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking][data-stage-expanded=false] .ck-q,body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking][data-stage-expanded=false] .ck-math,body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking][data-stage-expanded=false] .ck-body{display:none}body.stage-mode[data-stage-class=tall] #check[data-kind=manipulate][data-graphics=normal][data-phase=asking][data-stage-expanded=false] .ck-foot{position:static;margin:0;padding:0}.portrait-board-hint{display:flex;align-items:center;justify-content:center;gap:8px;flex:1;min-width:0;min-height:44px;padding:3px 8px;color:#1d1d1f;background:#f0f0ed;border-radius:12px;font-size:12.5px;line-height:15px}.portrait-board-hint>span:first-child{min-width:0}.portrait-board-hint>span:last-child{flex:none;font-size:20px}.portrait-board-hint[hidden],body.card-open .portrait-board-hint,body.on-world .portrait-board-hint{display:none!important}body.portrait-board-hint-on:not(.card-open):not(.on-world) #topTitle{display:none}body.portrait-board-hint-on:not(.card-open):not(.on-world) #top{opacity:1!important;transform:none!important;pointer-events:auto!important}.apcalc{--_bg: var(--calc-bg, var(--glass, rgba(255, 255, 255, .91)));--_ink: var(--calc-text, var(--text, #20242c));--_muted: var(--calc-muted, #656b78);--_line: var(--calc-line, rgba(37, 48, 70, .12));--_key: var(--calc-key, rgba(255, 255, 255, .8));--_soft: var(--calc-soft, rgba(73, 91, 126, .065));--_accent: var(--calc-accent, #255bc9);--_accent-soft: var(--calc-accent-soft, #eaf0ff);--_on-accent: var(--calc-on-accent, #fff);--_shadow: var(--calc-shadow, 0 24px 70px -20px rgba(27, 38, 68, .27), 0 3px 12px rgba(27, 38, 68, .04));position:fixed;z-index:var(--calc-z-index, 1000);top:var(--calc-top, auto);right:var(--calc-right, 24px);bottom:var(--calc-bottom, 24px);left:var(--calc-left, auto);width:min(var(--calc-width, 390px),calc(100vw - 24px));max-height:calc(var(--calc-viewport-height, 100dvh) - 24px);display:flex;flex-direction:column;overflow:hidden;border:1px solid var(--_line);border-radius:24px;background:var(--_bg);color:var(--_ink);box-shadow:var(--_shadow);-webkit-backdrop-filter:blur(28px) saturate(1.5);backdrop-filter:blur(28px) saturate(1.5);font:400 14px/1.4 var(--calc-font, var(--font, "Inter Tight", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif));text-align:left;letter-spacing:normal;color-scheme:light;isolation:isolate;pointer-events:auto;cursor:auto;touch-action:manipulation}.apcalc[data-theme=dark],.look-night .apcalc[data-theme=auto],[data-theme=dark] .apcalc[data-theme=auto]{--_bg: var(--calc-bg, rgba(26, 28, 35, .94));--_ink: var(--calc-text, #f2f4fa);--_muted: var(--calc-muted, #adb4c4);--_line: var(--calc-line, rgba(210, 221, 255, .13));--_key: var(--calc-key, rgba(255, 255, 255, .065));--_soft: var(--calc-soft, rgba(255, 255, 255, .045));--_accent: var(--calc-accent, #9cbdff);--_accent-soft: var(--calc-accent-soft, #2c3a57);--_on-accent: var(--calc-on-accent, #10274e);--_shadow: var(--calc-shadow, 0 30px 80px -16px rgba(0, 0, 0, .65));color-scheme:dark}.apcalc[data-theme=light]{--_bg: var(--calc-bg, rgba(255, 255, 255, .93));--_ink: var(--calc-text, #20242c)}@media(prefers-color-scheme:dark){.apcalc[data-theme=auto]:not(.look-day *,[data-theme=light] *){--_bg: var(--calc-bg, rgba(26, 28, 35, .94));--_ink: var(--calc-text, #f2f4fa);--_muted: var(--calc-muted, #adb4c4);--_line: var(--calc-line, rgba(210, 221, 255, .13));--_key: var(--calc-key, rgba(255, 255, 255, .065));--_soft: var(--calc-soft, rgba(255, 255, 255, .045));--_accent: var(--calc-accent, #9cbdff);--_accent-soft: var(--calc-accent-soft, #2c3a57);--_on-accent: var(--calc-on-accent, #10274e);--_shadow: var(--calc-shadow, 0 30px 80px -16px rgba(0, 0, 0, .65));color-scheme:dark}}.apcalc,.apcalc *{box-sizing:border-box}.apcalc [hidden],.apcalc[hidden]{display:none!important}.apcalc button,.apcalc input{font:inherit;color:inherit;margin:0}.apcalc button{appearance:none;-webkit-appearance:none;border:0;cursor:pointer;display:inline-flex;justify-content:center;align-items:center;padding:0;min-width:0;border-radius:11px;background:transparent;-webkit-tap-highlight-color:transparent;touch-action:manipulation;transition:background .15s,box-shadow .15s,transform .12s}.apcalc button:focus-visible{outline:2px solid var(--_accent);outline-offset:2px}.apcalc button:disabled{opacity:.38;cursor:default}.apcalc button:not(:disabled):active{transform:scale(.96)}@media(hover:hover){.apcalc button:not(:disabled):hover{background:var(--_accent-soft)}}.apcalc-header{display:flex;align-items:center;gap:10px;padding:10px 12px 4px 20px;flex:none;cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none}.apcalc-mark{color:var(--_accent);font-size:26px;line-height:1;font-weight:400}.apcalc-header h2{font:600 16px/1.2 inherit;font-family:inherit;font-size:16px;font-weight:600;letter-spacing:-.02em;margin:0;flex:1}.apcalc .apcalc-move,.apcalc .apcalc-close{width:44px;height:44px;color:var(--_muted);flex:none}.apcalc .apcalc-move{font-size:23px;cursor:grab}.apcalc .apcalc-close{font-size:25px;margin-left:-8px}.apcalc-dragging,.apcalc-dragging .apcalc-header,.apcalc-dragging .apcalc-move{cursor:grabbing}.apcalc-scroll{padding:0 16px 14px;overflow:auto;overscroll-behavior:contain;min-height:0;scrollbar-width:thin}.apcalc-tape-heading{display:flex;align-items:center;justify-content:space-between}.apcalc .apcalc-history-toggle{gap:7px;min-height:44px;padding:0 5px;font-size:12px;font-weight:500;color:var(--_muted)}.apcalc-count{min-width:18px;padding:1px 4px;border-radius:6px;background:var(--_soft);font-variant-numeric:tabular-nums}.apcalc-tape-hint{font-size:11px;color:var(--_muted);margin-right:6px}.apcalc-history{max-height:112px;overflow:auto;overscroll-behavior:contain;margin:0 0 10px;padding:4px;border-radius:12px;background:var(--_soft);scrollbar-width:thin}.apcalc .apcalc-history-item{width:100%;display:grid;grid-template-columns:1fr auto;gap:2px 10px;min-height:46px;padding:7px 10px;text-align:left;font-size:12px}.apcalc-history-item>span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.apcalc-history-item strong{font-weight:600;color:var(--_accent);grid-column:2;grid-row:1 / 3;font-variant-numeric:tabular-nums;max-width:160px;overflow-wrap:anywhere}.apcalc-history-item small{color:var(--_muted);font-size:9px;letter-spacing:.06em}.apcalc-empty{margin:8px;color:var(--_muted);font-size:12px}.apcalc-work{border:1px solid var(--_line);border-radius:16px;padding:12px 14px 10px;margin-bottom:12px;background:var(--_soft)}.apcalc-work:focus-within{border-color:var(--_accent);box-shadow:0 0 0 2px var(--_accent-soft)}.apcalc-work label{display:block;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--_muted);margin-bottom:4px}.apcalc .apcalc-input{display:block;width:100%;padding:4px 0;border:0;outline:0;border-radius:0;box-shadow:none;background:transparent;height:38px;font-size:25px;line-height:1.2;letter-spacing:-.025em;caret-color:var(--_accent)}.apcalc-input::placeholder{color:var(--_muted);opacity:.75;font-size:22px}.apcalc-pretty{min-height:28px;max-height:72px;overflow:auto;padding:2px 0;font:19px/1.35 "STIX Two Math","Cambria Math",Georgia,serif;color:var(--_muted);white-space:nowrap}.apcalc-pretty:empty{min-height:12px}.apcalc sup{font-size:.65em;line-height:0;vertical-align:super}.apcalc-radical{display:inline-flex;align-items:baseline}.apcalc-radicand{border-top:1px solid currentColor;padding:0 2px;margin-left:-1px}.apcalc-result-row{display:flex;align-items:baseline;gap:12px;padding:8px 0 4px}.apcalc-equals{color:var(--_muted);font-size:20px}.apcalc-result{display:block;font-size:32px;font-weight:500;line-height:1.2;letter-spacing:-.035em;color:var(--_accent);font-variant-numeric:tabular-nums;overflow-wrap:anywhere;min-width:0}.apcalc-result.apcalc-result-long{font-size:22px;white-space:nowrap}.apcalc-hint{margin:6px 0 0;font-size:11px;line-height:1.4;color:var(--_muted);min-height:16px}.apcalc-invalid .apcalc-hint{color:var(--calc-error, #b34b3a)}.apcalc[data-theme=dark].apcalc-invalid .apcalc-hint,.look-night .apcalc-invalid .apcalc-hint{color:var(--calc-error, #ffa996)}.apcalc-functions{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:4px;margin-bottom:10px}.apcalc-functions>button{height:44px;font-size:16px;background:var(--_soft);font-weight:500}.apcalc-functions [data-insert=ANS]{font-size:12px;letter-spacing:.015em}.apcalc-functions [data-action=scientific]{font-size:14px;color:var(--_accent)}.apcalc-angle{grid-column:span 2;display:flex;align-items:center;padding:4px;border:1px solid var(--_line);border-radius:11px;gap:2px}.apcalc-angle button{flex:1;height:34px;font-size:11px;font-weight:600;letter-spacing:.03em;color:var(--_muted)}.apcalc-angle button[aria-pressed=true]{background:var(--_accent-soft);color:var(--_accent);box-shadow:0 1px 3px #0000000a}.apcalc-keypad{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:5px}.apcalc-keypad button{height:47px;background:var(--_key);box-shadow:inset 0 0 0 1px var(--_line);font-size:22px;font-weight:500}.apcalc-keypad .apcalc-op{background:var(--_accent-soft);color:var(--_accent);box-shadow:none;font-size:25px;font-weight:400}.apcalc-keypad .apcalc-calculate{background:var(--_soft);color:var(--_accent)}.apcalc-footer{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 16px;border-top:1px solid var(--_line);flex:none}.apcalc-footer>span{font-size:11px;color:var(--_muted)}.apcalc .apcalc-use{height:44px;gap:15px;border-radius:13px;background:var(--_accent);color:var(--_on-accent);padding:0 16px;font-size:13px;font-weight:600}.apcalc .apcalc-use:not(:disabled):hover{background:var(--_accent);box-shadow:0 0 0 3px var(--_accent-soft)}@media(max-width:520px){.apcalc{top:auto;right:0;left:0;bottom:var(--calc-keyboard-offset, 0px);width:100%;max-height:calc(var(--calc-viewport-height, 100dvh) - 8px);border-radius:24px 24px 0 0;border-bottom:0}.apcalc-header{cursor:default;padding-top:6px}.apcalc .apcalc-move{display:none}.apcalc-scroll{padding-left:12px;padding-right:12px}.apcalc-footer{padding-bottom:calc(10px + env(safe-area-inset-bottom))}.apcalc-work{margin-bottom:8px;padding-top:10px}.apcalc-functions{margin-bottom:8px}}@media(prefers-reduced-motion:reduce){.apcalc button{transition:none}}@media(forced-colors:active){.apcalc,.apcalc button,.apcalc-work{border:1px solid CanvasText}}