@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-ext-wght-normal-DjL33-gN.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-cyrillic-wght-normal-BEAKL7Jp.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-vietnamese-wght-normal-6IgcOCM7.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-latin-ext-wght-normal-DC-KSUi6.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Geist Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-latin-wght-normal-BgDaEnEv.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Geist Mono Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-mono-cyrillic-ext-wght-normal-X_5orZeX.woff2)format("woff2-variations");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:Geist Mono Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-mono-cyrillic-wght-normal-DiZS0aHC.woff2)format("woff2-variations");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:Geist Mono Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-mono-symbols2-wght-normal-CO5SzqOn.woff2)format("woff2-variations");unicode-range:U+2000-2001,U+2004-2008,U+200A,U+23B8-23BD,U+2500-259F}@font-face{font-family:Geist Mono Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-mono-vietnamese-wght-normal-DadHysG0.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Geist Mono Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-mono-latin-ext-wght-normal-Bwz-egvJ.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Geist Mono Variable;font-style:normal;font-display:swap;font-weight:100 900;src:url(/assets/geist-mono-latin-wght-normal-XN7g48iV.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--ground:#08090b;--ground-1:#0e1014;--ground-2:#171a20;--ink:#dce0e6;--ink-62:#dce0e69e;--ink-38:#dce0e661;--ink-18:#dce0e62e;--hairline:#dce0e61a;--hairline-strong:#dce0e633;--accent:#2be8ce;--accent-62:#2be8ce9e;--accent-18:#2be8ce2e;--accent-08:#2be8ce14;--warn:#ff6b47;--cube-U:#f2d024;--cube-R:#14a05a;--cube-F:#d8352a;--cube-D:#eceff2;--cube-L:#1c5fd0;--cube-B:#eb7b1c;--light-key:#fff6e8;--light-fill:#9fb6d8;--light-rim:#dfe9ff;--light-under:#b9c8e6;--plastic:#0a0b0d;--plastic-dim:#07080a;--font-display:"Geist Variable", ui-sans-serif, system-ui, sans-serif;--font-mono:"Geist Mono Variable", ui-monospace, "SFMono-Regular", monospace;--t-display:clamp(3.25rem, 9vw, 10.5rem);--t-h1:clamp(2.25rem, 5vw, 4.5rem);--t-h2:clamp(1.5rem, 2.75vw, 2.5rem);--t-lead:clamp(1.0625rem, 1.4vw, 1.3125rem);--t-body:1rem;--t-small:.8125rem;--t-chrome:.6875rem;--track-display:-.035em;--track-h1:-.03em;--track-h2:-.02em;--track-chrome:.16em;--lead-display:.92;--lead-h1:1;--lead-body:1.65;--margin:clamp(1.5rem, 6vw, 7rem);--maxw:1600px;--space-section:clamp(6rem, 16vh, 14rem);--space-block:clamp(2.5rem, 7vh, 5rem);--space-tight:clamp(1rem, 2vh, 1.75rem);--ruler-a:var(--margin);--ruler-b:38%;--ruler-c:62%;--r-none:0px;--r-lg:20px;--r-pill:999px;--ease-enter:cubic-bezier(.16, 1, .3, 1);--ease-ui:cubic-bezier(.4, 0, .2, 1);--dur-enter:.9s;--dur-ui:.22s;--dur-turn:.46s;--stagger:75ms;--contact-shadow:0 24px 48px #0009;--z-canvas:0;--z-content:1;--z-hud:40;--z-grain:100}@media (prefers-reduced-motion:reduce){:root{--dur-enter:1ms;--dur-ui:1ms;--dur-turn:1ms;--stagger:0s}}*,:before,:after{box-sizing:border-box}*{margin:0}html{-webkit-text-size-adjust:100%;scrollbar-color:var(--ink-18) transparent}body{background:var(--ground);min-height:100dvh;color:var(--ink);font-family:var(--font-display);font-size:var(--t-body);line-height:var(--lead-body);font-synthesis-weight:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;overflow-x:hidden}img,video,canvas{max-width:100%;display:block}button,input,select{font:inherit;color:inherit}:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}:focus:not(:focus-visible){outline:none}::selection{background:var(--accent-18);color:var(--ink)}.display{font-size:var(--t-display);letter-spacing:var(--track-display);font-weight:300;line-height:var(--lead-display);text-wrap:balance}.h1{font-size:var(--t-h1);letter-spacing:var(--track-h1);font-weight:300;line-height:var(--lead-h1);text-wrap:balance}.h2{font-size:var(--t-h2);letter-spacing:var(--track-h2);text-wrap:balance;font-weight:400;line-height:1.1}.lead{font-size:var(--t-lead);letter-spacing:-.005em;color:var(--ink-62);text-wrap:pretty;max-width:45ch;line-height:1.55}.body{max-width:62ch;color:var(--ink-62);text-wrap:pretty}.chrome{font-family:var(--font-mono);font-size:var(--t-chrome);letter-spacing:var(--track-chrome);text-transform:uppercase;color:var(--ink-38);font-variant-numeric:tabular-nums;font-weight:500;line-height:1.2}.chrome--lit{color:var(--ink-62)}.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:0}.at-a{margin-left:var(--ruler-a)}.at-b{margin-left:max(var(--ruler-a), var(--ruler-b))}.at-c{margin-left:max(var(--ruler-a), var(--ruler-c))}@media (width<=900px){.at-b,.at-c{margin-left:var(--ruler-a)}}.hairline{border:1px solid var(--hairline)}.rule{background:var(--hairline);border:0;height:1px}.grain:after{content:"";z-index:var(--z-grain);pointer-events:none;opacity:.035;mix-blend-mode:overlay;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");position:fixed;inset:0}.js .reveal{opacity:0;clip-path:inset(0 0 100%);transform:translateY(24px)}.js .reveal.is-in{opacity:1;clip-path:inset(0 0 -20%);transition:opacity var(--dur-enter) var(--ease-enter), transform var(--dur-enter) var(--ease-enter), clip-path var(--dur-enter) var(--ease-enter);transition-delay:var(--reveal-delay,0s);transform:none}@media (prefers-reduced-motion:reduce){.js .reveal,.js .reveal.is-in{opacity:1;clip-path:none;transition:none;transform:none}*,:before,:after{scroll-behavior:auto!important;animation-duration:1ms!important;animation-iteration-count:1!important}}.sr-only{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{top:var(--space-tight);left:var(--space-tight);z-index:200;background:var(--ground-1);border:1px solid var(--accent);color:var(--ink);padding:.75rem 1.25rem;text-decoration:none;position:absolute;transform:translateY(-200%)}.skip-link:focus{transform:none}.landing{z-index:var(--z-content);position:relative}.anchor{z-index:var(--z-canvas);pointer-events:none;position:fixed;inset:0}.anchor canvas{width:100%!important;height:100%!important}.nav{z-index:var(--z-hud);padding:clamp(1.1rem, 2.4vh, 1.9rem) var(--margin);mix-blend-mode:difference;justify-content:space-between;align-items:center;display:flex;position:fixed;top:0;left:0;right:0}.nav__mark,.tool__home{color:var(--ink);align-items:center;gap:.6rem;text-decoration:none;display:inline-flex}.nav__glyph,.tool__mark{background:var(--accent);border-radius:2px;width:11px;height:11px}.nav__cta{color:var(--ink);border-bottom:1px solid var(--hairline-strong);transition:border-color var(--dur-ui) var(--ease-ui);padding:.55rem 0;text-decoration:none}.nav__cta:hover{border-color:var(--ink)}.chapter{min-height:100svh;padding-block:var(--space-section);align-items:center;display:flex;position:relative}.chapter__copy{gap:var(--space-tight);flex-direction:column;max-width:min(46ch,46vw);display:flex}.chapter__copy--centred{align-items:flex-start;max-width:none}.chapter--hero .display em{color:var(--ink-62);font-style:normal}.chapter--hero:before{content:"";pointer-events:none;background:radial-gradient(38% 46% at 72% 52%,#262c388c 0%,#0000 70%);position:absolute;inset:0}@media (width<=900px){.chapter--hero:before{background:radial-gradient(52% 30% at 50% 26%,#262c3880 0%,#0000 72%)}}.hero__actions{margin-top:var(--space-tight);flex-wrap:wrap;align-items:center;gap:1.4rem;display:flex}.hero__note{color:var(--ink-38)}.hero__scroll{bottom:clamp(1.5rem,4vh,2.75rem);left:var(--margin);writing-mode:vertical-rl;color:var(--ink-38);position:absolute}.hero__scroll:after{content:"";background:linear-gradient(var(--hairline-strong), transparent);width:1px;height:3.2rem;margin-top:.7rem;margin-left:-.5px;display:block}.chapter--problem,.chapter--close{min-height:92svh}.chapter--close{justify-content:flex-start}.eyebrow{align-items:baseline;gap:.85rem;display:flex}.eyebrow:before{content:"";background:var(--hairline-strong);width:clamp(1.5rem,4vw,3.5rem);height:1px;transform:translateY(-.28em)}.eyebrow__index{color:var(--accent-62)}.cta{min-height:44px;color:var(--ink);border:1px solid var(--hairline-strong);border-radius:var(--r-pill);transition:background-color var(--dur-ui) var(--ease-ui), border-color var(--dur-ui) var(--ease-ui), color var(--dur-ui) var(--ease-ui);background:0 0;align-items:center;gap:.9rem;padding:.95rem 1.6rem;text-decoration:none;display:inline-flex}.cta svg{transition:transform var(--dur-ui) var(--ease-ui)}.cta:hover{border-color:var(--accent);color:var(--accent)}.cta:hover svg{transform:translate(4px)}.cta--large{font-size:var(--t-lead);padding:1.15rem 2rem}.foot{z-index:var(--z-content);padding:var(--space-block) var(--margin) clamp(1.5rem, 4vh, 2.5rem);border-top:1px solid var(--hairline);flex-wrap:wrap;justify-content:space-between;gap:1rem;display:flex;position:relative}.foot a{color:var(--ink-62);border-bottom:1px solid var(--hairline-strong);text-decoration:none}.foot a:hover{color:var(--ink)}@media (width<=900px){.chapter__copy{max-width:none;padding-right:var(--margin)}.chapter{min-height:auto;padding-block:clamp(5rem,14vh,8rem)}.chapter--hero{align-items:flex-start;min-height:100svh;padding-top:44svh;padding-bottom:clamp(3rem,10vh,6rem)}.anchor{height:42svh;bottom:auto}.hero__scroll{display:none}.nav{mix-blend-mode:normal;background:linear-gradient(var(--ground), transparent)}}.tool{background:radial-gradient(64% 48% at 26% 8%, var(--ground-1) 0%, transparent 66%), var(--ground);flex-direction:column;min-height:100svh;display:flex}.tool__bar{padding:clamp(.9rem, 2vh, 1.4rem) var(--margin);border-bottom:1px solid var(--hairline);justify-content:space-between;align-items:center;gap:1rem;display:flex}.tool__home{text-decoration:none}.tool__steps{color:var(--ink-38);gap:.7rem;display:flex}.tool__steps .is-now{color:var(--accent)}.tool__sep{color:var(--ink-18)}.tool__error{padding:var(--space-tight) var(--margin) var(--space-block);flex-wrap:wrap;align-items:center;gap:1rem;display:flex}.btn{border:1px solid var(--hairline-strong);border-radius:var(--r-pill);min-height:44px;color:var(--ink-62);font-size:var(--t-small);cursor:pointer;transition:color var(--dur-ui) var(--ease-ui), border-color var(--dur-ui) var(--ease-ui), background-color var(--dur-ui) var(--ease-ui);background:0 0;padding:.7rem 1.25rem}.btn:hover:not(:disabled){color:var(--ink);border-color:var(--ink-38)}.btn:disabled{opacity:.38;cursor:not-allowed}.btn--accent{color:var(--ground);background:var(--accent);border-color:var(--accent);font-weight:500}.btn--accent:hover:not(:disabled){color:var(--ground);background:var(--ink);border-color:var(--ink)}.step-btn{border:1px solid var(--hairline-strong);width:56px;height:56px;color:var(--ink);cursor:pointer;transition:border-color var(--dur-ui) var(--ease-ui), color var(--dur-ui) var(--ease-ui);background:0 0;border-radius:50%;place-items:center;display:grid}.step-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}.step-btn:disabled{opacity:.28;cursor:not-allowed}.scan{flex:1;grid-template-columns:1fr;min-height:0;display:grid}.scan--live{grid-template-columns:minmax(0,1fr) minmax(320px,27rem)}.scan__stage{background:var(--ground-1);place-items:center;display:grid;position:relative;overflow:hidden}.scan:not(.scan--live) .scan__stage{place-items:center start}.scan__video{object-fit:cover;filter:saturate(1.04)contrast(1.02);width:100%;height:100%;position:absolute;inset:0}.reticle{aspect-ratio:1;width:min(62vmin,26rem);transition:box-shadow var(--dur-ui) var(--ease-ui);position:relative;box-shadow:0 0 0 100vmax #040507b8}.reticle__grid{grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(3,1fr);display:grid;position:absolute;inset:0}.reticle__cell{border:1px solid #dce0e629}.reticle__tick{border:2px solid var(--ink-38);width:22px;height:22px;transition:border-color var(--dur-ui) var(--ease-ui);position:absolute}.reticle__tick--tl{border-bottom:0;border-right:0;top:-2px;left:-2px}.reticle__tick--tr{border-bottom:0;border-left:0;top:-2px;right:-2px}.reticle__tick--bl{border-top:0;border-right:0;bottom:-2px;left:-2px}.reticle__tick--br{border-top:0;border-left:0;bottom:-2px;right:-2px}.reticle--ready .reticle__tick{border-color:var(--accent)}.reticle--warn .reticle__tick{border-color:var(--warn)}.reticle.is-captured{box-shadow:0 0 0 100vmax #040507eb}.reticle__ring{pointer-events:none;width:calc(100% + 20px);height:calc(100% + 20px);position:absolute;inset:-10px;overflow:visible}.reticle__ring-fill{fill:none;stroke:var(--accent);stroke-width:.5px;stroke-dasharray:400;transition:stroke-dashoffset 90ms linear}.scan__gate{z-index:1;max-width:42ch;padding:var(--space-block) var(--margin);gap:var(--space-tight);flex-direction:column;display:flex;position:relative}.scan__gate-actions{margin-top:var(--space-tight);flex-wrap:wrap;gap:.75rem;display:flex}.scan__coach{gap:var(--space-tight);border-left:1px solid var(--hairline);background:var(--ground);flex-direction:column;padding:clamp(1.25rem,3vh,2.25rem);display:flex;overflow-y:auto}.scan__coach-head{flex-direction:column;gap:.7rem;display:flex}.ghost{border:1px solid var(--hairline);border-radius:var(--r-lg);background:var(--ground-1);align-self:flex-start}.scan__coach-copy{flex-direction:column;gap:.6rem;display:flex}.scan__roll{color:var(--ink-38)}.scan__verdict{font-family:var(--font-mono);font-size:var(--t-small);letter-spacing:.04em;border:1px solid var(--hairline);border-radius:var(--r-lg);color:var(--ink-62);padding:.85rem 1rem}.scan__verdict--ready{color:var(--accent);border-color:var(--accent-18);background:var(--accent-08)}.scan__verdict--warn{color:var(--warn);border-color:#ff6b473d}.scan__hint,.solve__keyhint{color:var(--ink-38)}.scan__coach-actions{flex-wrap:wrap;gap:.6rem;margin-top:auto;display:flex}.review{padding:clamp(1.75rem, 5vh, 3.25rem) var(--margin) var(--space-block);flex-direction:column;flex:1;gap:clamp(1.5rem,4vh,2.75rem);display:flex}.review__head{flex-direction:column;gap:.75rem;max-width:60ch;display:flex}.review__body{grid-template-columns:minmax(0,1fr) minmax(260px,22rem);align-items:start;gap:clamp(2rem,5vw,4.5rem);display:grid}.net{grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(.4rem,1vw,.8rem);max-width:40rem;display:grid}.net__face{flex-direction:column;gap:.45rem;display:flex}.net__label{color:var(--ink-38)}.net__grid{aspect-ratio:1;grid-template-columns:repeat(3,1fr);gap:3px;display:grid}.sticker{appearance:none;background:var(--sticker);cursor:pointer;aspect-ratio:1;transition:transform var(--dur-ui) var(--ease-ui);border:0;border-radius:3px;padding:0;box-shadow:inset 0 0 0 1px #00000059}.sticker:hover{transform:scale(1.06)}.sticker--centre{cursor:default;box-shadow:inset 0 0 0 1px #00000059,inset 0 0 0 4px #00000040}.sticker.is-selected{outline:2px solid var(--accent);outline-offset:2px;transform:scale(1.08)}.sticker.is-uncertain{box-shadow:inset 0 0 0 1px #00000059, 0 0 0 2px var(--warn)}.review__panel{gap:var(--space-tight);top:var(--space-tight);flex-direction:column;display:flex;position:sticky}.palette,.tally{border:1px solid var(--hairline);border-radius:var(--r-lg);flex-direction:column;gap:.7rem;padding:1.1rem;display:flex}.palette__row{flex-wrap:wrap;gap:.5rem;display:flex}.palette__swatch{background:var(--sticker);cursor:pointer;width:44px;height:44px;transition:transform var(--dur-ui) var(--ease-ui);border:1px solid #0006;border-radius:6px}.palette__swatch:hover{transform:translateY(-2px)}.palette__swatch.is-armed{outline:2px solid var(--ink);outline-offset:3px}.palette__hint{color:var(--ink-38)}.tally__list{gap:.4rem;padding:0;list-style:none;display:grid}.tally__list li{font-size:var(--t-small);color:var(--ink-62);grid-template-columns:12px 1fr auto;align-items:center;gap:.6rem;display:grid}.tally__list li.is-off{color:var(--warn)}.tally__chip{background:var(--sticker);border-radius:2px;width:12px;height:12px}.notice{font-size:var(--t-small);border-radius:var(--r-lg);border:1px solid var(--hairline);color:var(--ink-62);padding:.9rem 1rem;line-height:1.5}.notice--ok{color:var(--accent);border-color:var(--accent-18);background:var(--accent-08)}.notice--warn{color:var(--warn);border-color:#ff6b473d}.review__actions{flex-wrap:wrap;gap:.6rem;display:flex}.solve{flex:1;grid-template-columns:minmax(0,1fr) minmax(340px,30rem);min-height:0;display:grid}.solve__stage{background:radial-gradient(60% 50% at 42% 32%, var(--ground-2) 0%, transparent 70%), var(--ground-1);min-height:46svh;position:relative}.solve__canvas{position:absolute;inset:0}.solve__corner{color:var(--ink-38);pointer-events:none;position:absolute}.solve__corner--tl{top:1.25rem;left:1.5rem}.solve__corner--tr{top:1.25rem;right:1.5rem}.solve__corner--bl{bottom:1.25rem;left:1.5rem}.solve__panel{gap:var(--space-tight);border-left:1px solid var(--hairline);flex-direction:column;padding:clamp(1.25rem,3vh,2.25rem);display:flex;overflow-y:auto}.solve__instruction{flex-direction:column;gap:.55rem;display:flex}.solve__notation{font-family:var(--font-mono);letter-spacing:-.02em;font-variant-numeric:tabular-nums;align-items:center;gap:.9rem;font-size:clamp(3rem,7vw,5rem);font-weight:500;line-height:1;display:flex}.solve__face-chip{background:var(--sticker);border-radius:4px;width:.6em;height:.6em;box-shadow:inset 0 0 0 1px #0006}.solve__says{font-size:var(--t-lead);max-width:34ch;line-height:1.45}.solve__orient{font-family:var(--font-display);font-size:var(--t-small);letter-spacing:0;text-transform:none;color:var(--ink-38);max-width:42ch;line-height:1.5}.solve__controls{align-items:center;gap:1.25rem;display:flex}.solve__counter{align-items:baseline;gap:.35rem;display:flex}.solve__counter-now{color:var(--ink);font-size:1.6rem}.rail{border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline);flex-wrap:wrap;gap:.35rem;margin:0;padding:.6rem 0;list-style:none;display:flex}.rail__token{min-width:42px;min-height:34px;font-family:var(--font-mono);font-size:var(--t-small);color:var(--ink-38);cursor:pointer;transition:color var(--dur-ui) var(--ease-ui), border-color var(--dur-ui) var(--ease-ui);background:0 0;border:1px solid #0000;border-radius:5px;padding:.3rem .5rem}.rail__token.is-done{color:var(--ink-18)}.rail__token.is-active{color:var(--accent);border-color:var(--accent-18);background:var(--accent-08)}.rail__token:hover{color:var(--ink)}.solve__meta{flex-wrap:wrap;gap:.5rem;display:flex}kbd{min-width:1.6em;font-family:var(--font-mono);text-align:center;color:var(--ink-62);border:1px solid var(--hairline-strong);border-radius:4px;padding:.15em .4em;font-size:.95em;display:inline-block}.shortcuts{z-index:120;padding:var(--margin);background:#040507c7;place-items:center;display:grid;position:fixed;inset:0}.shortcuts__panel{background:var(--ground-1);border:1px solid var(--hairline);border-radius:var(--r-lg);flex-direction:column;gap:1.1rem;width:100%;max-width:30rem;padding:clamp(1.5rem,4vh,2.5rem);display:flex}.shortcuts__list{gap:.7rem;margin:0;display:grid}.shortcuts__list>div{grid-template-columns:8.5rem 1fr;align-items:center;gap:1rem;display:grid}.shortcuts__list dt{gap:.3rem;display:flex}.shortcuts__list dd{font-size:var(--t-small);color:var(--ink-62);margin:0}@media (width<=1000px){.scan,.solve{grid-template-columns:1fr}.scan__stage{min-height:52svh}.scan__coach,.solve__panel{border-left:0;border-top:1px solid var(--hairline)}.review__body{grid-template-columns:1fr}.review__panel{position:static}.solve__corner--bl{display:none}}@media (width<=620px){.net{gap:.35rem}.net__label{font-size:.5625rem}.solve__notation{font-size:2.75rem}}