:root{color-scheme:dark;--bg:#08090e;--panel:#101117;--line:#252630;--muted:#858695;--white:#f5f5fa;--blue:#51c9ff;--red:#ff405f;--mono:'SFMono-Regular',Consolas,'Liberation Mono',monospace;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--white);background:radial-gradient(ellipse at 50% 0%,#17121c 0,#0c0d13 42%,var(--bg) 80%)}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit}.shell{width:min(1120px,calc(100% - 40px));margin:0 auto}.topbar{height:76px;border-bottom:1px solid #ffffff12;display:flex;align-items:center;justify-content:space-between}.wordmark{text-decoration:none;display:flex;align-items:center;gap:10px;font-size:12px;letter-spacing:.11em;font-weight:800}.wordmark b{color:#ff405f}.mark{width:28px;height:28px;display:grid;place-items:center;border:1px solid #ff405f90;color:#ff7184;transform:skew(-8deg);font-size:14px}.top-actions{display:flex;align-items:center;gap:24px}.prototype-tag,.back-link{font-size:10px;letter-spacing:.13em;color:#aeb0bc;text-decoration:none}.prototype-tag{display:flex;gap:8px;align-items:center}.prototype-tag i,.live-dot{width:6px;height:6px;background:#54e0a1;border-radius:50%;box-shadow:0 0 9px #54e0a1}.back-link{transition:color .2s}.back-link:hover{color:white}.intro{display:flex;align-items:end;justify-content:space-between;gap:30px;padding:41px 0 27px}.eyebrow,.card-index{margin:0 0 10px;color:#ff6076;font:600 10px var(--mono);letter-spacing:.14em;text-transform:uppercase}.intro h1{font-size:clamp(38px,6vw,57px);line-height:.98;letter-spacing:-.065em;margin:0;font-weight:850}.intro h1 span{color:#ff536b}.lede{margin:13px 0 0;color:#a0a1ae;max-width:560px;font-size:13px;line-height:1.65}.song-chip{display:flex;align-items:center;gap:12px;padding:12px 15px;border:1px solid #ffffff13;border-radius:8px;background:#ffffff05;white-space:nowrap}.song-chip b,.song-chip small{display:block}.song-chip b{font:600 9px var(--mono);letter-spacing:.08em}.song-chip small{font:10px var(--mono);color:#888a98;margin-top:5px}.pulse-bars{display:flex;align-items:center;gap:3px;height:26px}.pulse-bars i{display:block;width:3px;border-radius:4px;background:#ff536b;height:35%;animation:equalize .8s ease-in-out infinite alternate}.pulse-bars i:nth-child(2){height:70%;animation-delay:.2s}.pulse-bars i:nth-child(3){height:50%;animation-delay:.4s}.pulse-bars i:nth-child(4){height:90%;animation-delay:.1s}@keyframes equalize{to{transform:scaleY(.42)}}.game-card{border:1px solid #ffffff18;border-radius:11px;overflow:hidden;background:#0b0c12;box-shadow:0 18px 70px #0008}.hud{height:68px;display:flex;align-items:center;padding:0 21px;gap:35px;border-bottom:1px solid #ffffff12;background:#101117}.hud-stat>span{display:block;font:9px var(--mono);letter-spacing:.12em;color:#858794;margin-bottom:5px}.hud-stat>strong{font:700 17px var(--mono);letter-spacing:.03em}.combo-stat strong{color:#fff;display:flex;align-items:baseline;gap:2px}.combo-stat strong small{font-size:10px;color:#ff6076}.accuracy-stat strong{font-size:15px}.progress-stat{flex:1;max-width:230px}.progress-stat>div{height:4px;width:100%;border-radius:8px;background:#292a34;display:inline-block;vertical-align:middle;margin-right:9px;width:calc(100% - 42px)}.progress-track i{display:block;background:linear-gradient(90deg,#ff405f,#ff9b5e);height:100%;width:0;border-radius:inherit;transition:width .1s linear}.progress-stat>small{font:10px var(--mono);color:#999}.hud-buttons{display:flex;gap:8px;margin-left:auto}.icon-button{border:1px solid #343540;background:#171820;border-radius:6px;color:#e4e4ea;width:34px;height:34px;font-size:15px;cursor:pointer}.icon-button:hover{border-color:#747583}.stage-wrap{position:relative;overflow:hidden;background:#0b0d14}.stage-wrap canvas{display:block;width:100%;height:auto;aspect-ratio:16/8.3;touch-action:manipulation}.overlay{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(90deg,#07080dc9,#07080d71 58%,#07080d93);transition:opacity .25s,visibility .25s}.overlay.hidden{opacity:0;visibility:hidden;pointer-events:none}.overlay-panel{width:min(430px,80%);padding:10px 0 0 7%;}.overlay-kicker{display:flex;align-items:center;gap:6px;font:600 9px var(--mono);letter-spacing:.14em;color:#c5c5cf}.mini-dot,.swatch{display:inline-block;width:7px;height:7px;border-radius:2px}.mini-dot.blue,.swatch.blue{background:var(--blue);box-shadow:0 0 12px #51c9ff80}.mini-dot.red,.swatch.red{background:var(--red);box-shadow:0 0 12px #ff405f80}.slash{color:#565763;margin:0 3px}.overlay h2{font-size:clamp(32px,5.4vw,54px);line-height:.96;letter-spacing:-.055em;margin:18px 0 12px}.overlay h2 em{font-style:normal;color:#ff536b}.overlay-panel>p:not(.keys-hint){font-size:12px;line-height:1.6;color:#a3a4b1;max-width:340px;margin:0 0 21px}.start-button{border:0;border-radius:6px;padding:13px 18px;background:#ff405f;color:#fff;font-weight:750;font-size:12px;letter-spacing:.02em;cursor:pointer;box-shadow:0 6px 22px #ff405f35;transition:transform .18s,background .18s}.start-button:hover{background:#ff5972;transform:translateY(-1px)}.start-button span{font-size:16px;margin-left:17px}.keys-hint{font:10px var(--mono);color:#8c8d9a;margin:13px 0 0}.keys-hint kbd,.info-card kbd,.lane-label kbd{display:inline-grid;place-items:center;min-width:17px;height:19px;padding:0 4px;border:1px solid #42434f;border-bottom-width:2px;border-radius:4px;color:#eee;font:10px var(--mono);margin-right:3px}.keys-hint>span{margin:0 5px;color:#51525e}.lane-label{position:absolute;bottom:15px;display:flex;align-items:center;gap:7px;color:#b6b7c2;font:9px var(--mono);letter-spacing:.1em;pointer-events:none}.lane-label kbd{height:17px;min-width:17px;font-size:9px;margin-left:2px}.left-label{left:6%}.right-label{right:6%}.hit-flash{position:absolute;inset:0;pointer-events:none;opacity:0;background:radial-gradient(ellipse at 50% 60%,#ffffff18,transparent 60%)}.hit-flash.active{animation:flash .22s ease-out}@keyframes flash{0%{opacity:1}100%{opacity:0}}.game-footer{height:37px;padding:0 17px;display:flex;align-items:center;justify-content:space-between;border-top:1px solid #ffffff0d;color:#71727e;font:9px var(--mono);letter-spacing:.035em}.game-footer>span:first-child{display:flex;align-items:center;gap:8px;color:#9b9ca8}.live-dot{width:5px;height:5px}.below-grid{display:grid;grid-template-columns:1fr 1fr 1.15fr;gap:12px;margin-top:15px}.info-card{padding:18px 18px 19px;background:#101117a6;border:1px solid #ffffff11;border-radius:8px}.card-index{font-size:8px;color:#818390;margin-bottom:12px}.info-card h3{font-size:14px;margin:0 0 8px;letter-spacing:-.02em}.info-card p{font-size:11px;line-height:1.7;color:#92939f;margin:0}.info-card kbd{height:17px;min-width:18px;font-size:9px}.note-card{border-color:#ff536b2a}.note-card .card-index{color:#ff7184}footer{display:flex;justify-content:center;align-items:center;gap:9px;padding:23px 0 28px;color:#777985;font-size:10px}footer a{color:#bbbcc5;text-decoration:none}footer a:hover{color:#ff7184}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}body.is-paused .pulse-bars i{animation-play-state:paused}@media(max-width:700px){.shell{width:min(100% - 24px,600px)}.topbar{height:60px}.prototype-tag{display:none}.top-actions{gap:0}.intro{padding:28px 0 20px;align-items:start;flex-direction:column;gap:16px}.intro h1{font-size:44px}.lede{font-size:12px}.song-chip{padding:9px 12px}.hud{height:60px;padding:0 11px;gap:15px}.hud-stat>span{font-size:8px}.hud-stat>strong{font-size:13px}.accuracy-stat{display:none}.progress-stat{max-width:none}.stage-wrap canvas{aspect-ratio:1/1}.overlay{background:linear-gradient(90deg,#07080de8,#07080d99)}.overlay-panel{padding-left:7%;width:92%}.overlay h2{font-size:40px}.overlay-panel>p:not(.keys-hint){max-width:270px;font-size:11px}.game-footer{height:auto;min-height:39px;padding:8px 11px;font-size:8px;gap:8px}.game-footer>span:last-child{text-align:right;max-width:54%;line-height:1.4}.below-grid{grid-template-columns:1fr;gap:8px;margin-top:10px}.info-card{padding:14px 16px}.info-card p{font-size:11px}footer{flex-wrap:wrap;font-size:9px;text-align:center;padding:20px 4px 25px}}@media(max-width:390px){.hud{gap:10px}.progress-stat{max-width:90px}.intro h1{font-size:38px}.overlay h2{font-size:34px}.keys-hint{font-size:9px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}}