:root{color-scheme:dark;--navy:#101e2d;--ink:#dce7ed;--muted:#91a6b7;--yellow:#f6cf57;--line:#2b3b4b}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:radial-gradient(ellipse at 70% 0,#243a4d 0,transparent 55%),var(--navy);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",sans-serif;min-height:100vh}.shell{width:min(1440px,94vw);margin:auto}.masthead{height:104px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--ink);font-size:23px;letter-spacing:3px;font-weight:700}.brand-icon{display:grid;place-items:center;width:44px;height:44px;border:1px solid #647682;color:var(--yellow);font-size:33px;border-radius:8px}.brand small{display:block;color:var(--muted);font:10px/2.3 Consolas,monospace;letter-spacing:2.3px}.header-note{display:flex;align-items:center;gap:12px;font-size:12px;color:#b2c2cd}.signal{width:6px;height:6px;border-radius:50%;background:var(--yellow);box-shadow:0 0 12px #f6cf5740}.divider{color:#546b7f;margin:0 8px}.stage{position:relative;aspect-ratio:16/9;background:#b8cbd9;border:1px solid #6a8292;border-radius:15px;overflow:hidden;box-shadow:0 28px 70px #0004}canvas{display:block;width:100%;height:100%;outline:none}canvas:focus-visible{outline:3px solid var(--yellow);outline-offset:-4px}.overlay{position:absolute;inset:0;display:flex;align-items:center;background:linear-gradient(90deg,#102235ed 0%,#112639c4 31%,#152c440a 69%)}.intro-card{padding:5.5%;width:65%}.eyebrow{display:block;font:10px/1.5 Consolas,monospace;letter-spacing:2px;color:var(--yellow)}h1{font-size:clamp(30px,4.2vw,62px);letter-spacing:1px;line-height:1.4;margin:20px 0 18px;color:#f7fafb;font-weight:700}h1 span{color:var(--yellow)}.intro-card p{font-size:clamp(11px,1vw,15px);line-height:1.9;color:#c2d1dc;margin:0 0 25px}.primary-button{border:0;border-radius:7px;background:var(--yellow);color:#172636;padding:15px 28px;min-width:180px;font:700 15px "Microsoft YaHei",sans-serif;cursor:pointer;box-shadow:0 6px 20px #0002;transition:background .15s,transform .15s}.primary-button:hover{background:#ffe48b;transform:translateY(-1px)}.primary-button:disabled{opacity:.6;cursor:wait;transform:none}.intro-card .loading{font-size:11px;min-height:20px;margin:9px 0 12px;color:#c8d5dd}.intro-keys{display:flex;gap:26px;font-size:12px;align-items:center;color:#b7c7d3}.intro-keys>span{display:flex;gap:5px;align-items:center}kbd{font:11px Consolas,monospace;border:1px solid #7e939f60;border-bottom-width:2px;padding:4px 7px;border-radius:4px;color:#e7eff3;background:#12233440;white-space:nowrap}.hud{position:absolute;left:4%;right:3%;top:4%;display:flex;justify-content:space-between;pointer-events:none}.score-panel{padding:14px 22px;background:#10263ad9;border:1px solid #d6e9f32b;border-radius:10px;min-width:110px;backdrop-filter:blur(8px)}.score-panel strong{font:700 44px/1.2 Consolas,monospace;color:#fff}.score-panel div>span{font-size:12px;margin-left:9px;color:#b6cbd7}.score-panel .eyebrow{font-size:10px;letter-spacing:1px}.hud-right{display:flex;gap:10px;align-items:flex-start}.best-pill,.icon-button{background:#10263ad9;border:1px solid #d6e9f32b;border-radius:7px;padding:12px 15px;color:#cddde7;font-size:12px}.best-pill b{color:var(--yellow);margin-left:8px;font:700 17px Consolas,monospace}.icon-button{pointer-events:auto;cursor:pointer;font-size:16px;min-width:44px}.stage-stamp{position:absolute;right:3%;bottom:4%;font:10px Consolas,monospace;letter-spacing:2px;color:#30485e99;pointer-events:none}.stage-stamp span{margin:0 8px}.control-bar{display:flex;justify-content:space-between;align-items:center;min-height:76px;border-bottom:1px solid var(--line);gap:12px}.control-bar p{display:flex;align-items:center;gap:12px;margin:0;font-size:12px}.control-bar strong{font-weight:500;color:#cddae2}.control-dot{width:5px;height:5px;border-radius:50%;background:var(--yellow)}.control-hint{color:var(--muted);margin-left:10px}.desktop-controls{display:flex;align-items:center;gap:24px;color:var(--muted);font-size:12px}.desktop-controls kbd{margin-right:7px}.text-button{border:0;background:none;color:#c9d8e1;cursor:pointer;font:12px "Microsoft YaHei",sans-serif;padding:10px 0}.text-button span{margin-left:10px;color:var(--yellow);font-size:18px}button:focus-visible{outline:2px solid var(--yellow);outline-offset:3px}.toast{position:absolute;left:50%;top:15%;transform:translateX(-50%);padding:11px 19px;background:#10263aeb;color:var(--yellow);font-size:13px;border-radius:7px;pointer-events:none}footer{display:flex;justify-content:space-between;gap:15px;color:#70899d;font-size:11px;line-height:1.8;padding:20px 0 25px}.touch-controls{display:none;justify-content:space-between;padding-top:16px;gap:14px}.touch-controls>div{display:flex;gap:10px}.touch-controls button{touch-action:none;user-select:none;min-width:66px;min-height:52px;border:1px solid #526578;border-radius:8px;background:#20364a;color:#e4edf2;font-size:24px}.touch-controls .touch-jump{background:var(--yellow);color:#152538;font-size:15px;font-weight:700;padding:0 24px}@media(pointer:coarse){.touch-controls{display:flex}}@media(max-width:760px){.masthead{height:80px}.brand{font-size:19px;letter-spacing:2px}.header-note{display:none}.stage{border-radius:10px}.intro-card{width:82%;padding:5%}h1{margin:10px 0;line-height:1.2}.intro-card p{line-height:1.6;margin-bottom:12px}.primary-button{padding:10px 18px;min-width:140px;font-size:13px}.intro-keys{gap:14px;font-size:10px}.intro-card .loading{margin:5px 0;font-size:10px;min-height:15px}.eyebrow{font-size:8px;letter-spacing:1px}.stage-stamp{display:none}.score-panel{padding:7px 12px;min-width:75px}.score-panel strong{font-size:29px}.best-pill,.icon-button{padding:8px 10px}.control-hint{display:none}.control-bar{min-height:64px}.desktop-controls{gap:12px}.desktop-controls>span{display:none}footer{font-size:10px}footer span:last-child{display:none}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}

@media(max-width:480px){.intro-card{width:100%;padding:5%}.intro-card>.eyebrow,.intro-keys{display:none}h1{font-size:23px;line-height:1.25;margin:6px 0 9px}h1 br{display:none}.intro-card p{font-size:10px;line-height:1.5;margin-bottom:9px}.intro-card .loading{font-size:9px;line-height:1.4;margin:6px 0 0}.primary-button{padding:8px 16px;font-size:12px;min-width:130px}.brand-icon{width:36px;height:36px}.brand small{font-size:8px}.touch-controls button{min-width:60px}.control-bar p{font-size:11px}}

/* Fit the full game and controls inside the visual viewport. */
html,body{height:100%;min-height:0;overflow:hidden}.shell{height:100vh;height:100dvh;display:flex;flex-direction:column;justify-content:center;min-height:0}.masthead{height:clamp(44px,8vh,80px);flex:none}.stage{width:min(100%,var(--stage-width,100%));align-self:center;flex:none;container-type:inline-size}.control-bar{height:52px;min-height:52px;flex:none}footer{height:34px;flex:none;padding:8px 0;align-items:center}.touch-controls{flex:none;padding-top:10px;padding-bottom:4px}.stage h1{font-size:clamp(22px,4.5cqw,62px)}.stage .intro-card p{font-size:clamp(10px,1.1cqw,15px)}
@container(max-width:700px){.intro-card{width:90%;padding:4%}.intro-card>.eyebrow,.intro-keys{display:none}.intro-card h1{font-size:clamp(20px,4.5cqw,32px);line-height:1.2;margin:5px 0 9px}.intro-card h1 br{display:none}.intro-card p{font-size:10px;line-height:1.45;margin:0 0 9px}.primary-button{padding:8px 16px;min-width:130px;font-size:12px}.intro-card .loading{font-size:9px;line-height:1.4;min-height:0;margin:5px 0 0}.score-panel{padding:7px 11px;min-width:70px}.score-panel strong{font-size:28px}.best-pill,.icon-button{padding:8px 9px}.hud-right{gap:5px}.best-pill b{font-size:13px;margin-left:3px}.stage-stamp{display:none}}
@media(max-height:500px){.masthead{height:44px}.brand{font-size:17px}.brand-icon{width:32px;height:32px;font-size:25px}.brand small{font-size:8px}.header-note{display:none}.control-bar{height:40px;min-height:40px}.control-hint,footer{display:none}.touch-controls{padding-top:6px;padding-bottom:2px}.touch-controls button{min-height:40px}.toast{font-size:11px;padding:6px 10px}}
@container(min-width:701px) and (max-width:1000px){.intro-card{padding:4%}.intro-card h1{font-size:clamp(28px,4cqw,40px);line-height:1.25;margin:12px 0}.intro-card p{font-size:11px;margin-bottom:16px}.intro-card .loading{margin:6px 0}.intro-keys{font-size:11px}}

.header-actions{display:flex;align-items:center;gap:22px}.music-button{flex:none;border:1px solid #536c80;border-radius:7px;padding:9px 12px;background:#1e3447;color:#f6cf57;font:12px "Microsoft YaHei",sans-serif;cursor:pointer;white-space:nowrap}.music-button:hover{background:#2b465e}@media(max-width:760px){.header-actions{gap:0}.music-button{padding:8px 10px;font-size:11px}}
.touch-controls .touch-jump{width:100%}

/* Compact HUD follows the game width, including phones in landscape. */
@container(max-width:1000px){
  .hud{left:2%;right:2%;top:3%;align-items:flex-start;gap:8px}
  .score-panel{min-width:0;padding:5px 9px;border-radius:6px}
  .score-panel strong{font-size:22px;line-height:1}
  .score-panel .eyebrow{font-size:8px;letter-spacing:.5px}
  .score-panel div>span{font-size:9px;margin-left:4px}
  .hud-right{align-items:center;gap:6px}
  .best-pill{padding:7px 8px;font-size:10px;line-height:1;border-radius:5px;white-space:nowrap}
  .best-pill b{font-size:12px;margin-left:4px}
  .icon-button{position:relative;min-width:32px;width:32px;height:32px;padding:0;margin-left:6px;font-size:13px;border-radius:5px;touch-action:manipulation}
  .icon-button::before{content:"";position:absolute;inset:-6px}
}
@container(max-width:700px){
  .score-panel{display:flex;align-items:center;gap:6px;padding:6px 7px}
  .score-panel strong{font-size:19px}
  .score-panel .eyebrow{font-size:8px;letter-spacing:0}
  .score-panel div{display:flex;align-items:baseline}
  .score-panel div>span{font-size:8px;margin-left:3px}
  .best-pill{padding:6px;font-size:9px}
  .best-pill b{font-size:11px;margin-left:3px}
}