:root{--paper:#f5e9cc;--ink:#173e49;--teal:#427a79;--gold:#dfaa58;--red:#ab624b;color:var(--ink);font-family:'Microsoft YaHei','PingFang SC',sans-serif}*{box-sizing:border-box}body{margin:0;background:#467b80;min-height:100dvh}[hidden]{display:none!important}button,input,a{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{font:inherit;color:inherit;min-height:44px;cursor:pointer;padding:10px 16px;border:1px solid #173e4966;border-radius:2px;background:var(--paper)}button:disabled{opacity:.45;cursor:default}button:active{transform:translateY(1px)}button:focus-visible,a:focus-visible,input:focus-visible,canvas:focus-visible{outline:3px solid var(--gold);outline-offset:3px}a{color:inherit}button:hover:not(:disabled){filter:brightness(1.06)}.world{position:fixed;inset:0;z-index:-2;overflow:hidden}.world>img{width:100%;height:100%;object-fit:cover;object-position:50% 50%}.world:after{content:'';position:absolute;inset:0;background:linear-gradient(#173e4930,transparent 35%,#173e49bb)}.ripple{position:absolute;inset:65% 0 10%;background:repeating-linear-gradient(0deg,transparent 0 8px,#ffdd8c22 9px 10px);mix-blend-mode:soft-light;animation:ripple 4s linear infinite}.light{position:absolute;inset:0;background:linear-gradient(130deg,#ffce6544,transparent 65%);animation:glow 9s ease-in-out infinite alternate}.leaves i{position:absolute;top:-10%;left:var(--x);width:8px;height:15px;border-radius:0 90% 0 90%;background:#d1a752;animation:leaf var(--d) var(--delay) linear infinite;opacity:0}@keyframes ripple{to{background-position:0 20px}}@keyframes glow{to{opacity:.35}}@keyframes leaf{10%,80%{opacity:.55}to{transform:translate(100px,110dvh) rotate(310deg)}}
header{height:84px;margin:0 4%;display:flex;align-items:center;gap:27px;border-bottom:1px solid #f5e9cc66;color:var(--paper)}.brand{font:29px 'SimSun',serif;text-decoration:none;display:flex;align-items:center;gap:10px}.brand small{font:9px/1.6 sans-serif;width:4em;letter-spacing:.15em}.chapter{font-size:12px;display:flex;gap:15px;align-items:center;letter-spacing:.12em}.chapter i{width:25px;height:1px;background:currentColor}nav{margin-left:auto;display:flex;gap:13px}nav button{border:0;background:none;color:inherit;padding:7px;font-size:12px;min-width:44px}.eyebrow{font-size:10px;line-height:1.8;letter-spacing:.14em;margin:0 0 12px}h1,h2,h3{font-family:'SimSun','Songti SC',serif;font-weight:400}h1{font-size:47px;line-height:1.4;margin:0 0 20px}.text-button{background:none;border:0;text-decoration:underline;text-underline-offset:5px;font-size:12px;padding-inline:0}
#building{width:min(1210px,90%);margin:37px auto 60px;display:grid;grid-template-columns:.85fr 1.5fr;gap:36px}.story-column{padding:24px;background:#f5e9cce8;box-shadow:5px 6px 0 #173e4944;align-self:start;border-top:3px solid var(--gold)}.lede{font-size:13px;line-height:2;margin:0 0 25px}.talk{display:grid;grid-template-columns:63px 1fr;gap:10px;border-block:1px solid #173e4933;padding:16px 0}.aqi-portrait{width:60px;height:60px;background:url('../xinsu/assets/aqi-sprites.png') 0 0/300% 200%;align-self:center}.talk strong{font-size:12px;color:var(--teal)}.talk p{font-size:13px;line-height:1.9;margin:6px 0}.talk button{font-size:11px;min-height:38px}.chapter-stamp{margin-top:24px;border-left:2px solid var(--red);padding-left:13px}.chapter-stamp span,.chapter-stamp b,.chapter-stamp small{display:block}.chapter-stamp span{font-size:9px;color:var(--red)}.chapter-stamp b{font:20px/1.8 'SimSun',serif}.chapter-stamp small{font-size:10px;line-height:1.8;opacity:.7}.model-sheet{position:relative;background:#f5e9ccf5;border:1px solid var(--ink);box-shadow:5px 6px 0 #173e4944;overflow:hidden}.model-sheet>p{position:absolute;top:13px;left:18px;right:18px;font-size:11px;line-height:1.8;margin:0;pointer-events:none;z-index:1}#building-canvas{display:block;width:100%;height:355px;touch-action:none}.camera-controls{display:flex;justify-content:center;align-items:center;gap:9px;padding:0 10px 12px}.camera-controls button{font-size:12px;background:none;padding:5px 12px}.camera-controls span{font-size:10px;opacity:.7}#building-fallback{height:355px;padding:45px 20px 0;text-align:center}#building-fallback svg{display:block;width:100%;height:85%;transform-origin:50% 100%}#building-fallback span{font-size:10px}.drive{margin:14px 0;background:#173e49ed;color:var(--paper);display:flex;align-items:center;gap:16px;padding:11px 18px;border:1px solid #f5e9cc66}.drive label{display:flex;align-items:center;gap:10px;white-space:nowrap}.drive b{font-size:11px;font-weight:400}.drive output{font:19px Georgia;min-width:45px}#wheel{font-size:36px;line-height:1}.drive input{accent-color:var(--gold);width:100%;min-width:60px;height:44px;cursor:ew-resize}.part-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.part-tabs button{font-size:11px;display:flex;justify-content:space-between;align-items:center;background:#f5e9ccf2;padding:10px}.part-tabs button[data-seen=true]{border-bottom:3px solid var(--gold)}.part-story{margin-top:12px;padding:16px 19px;background:#f5e9cced;border-left:3px solid var(--gold);min-height:106px}.part-story b{font:20px/1.6 'SimSun',serif}.part-story p{font-size:12px;line-height:1.9;margin:5px 0 0}#enter-stage{margin-top:14px;background:var(--teal);color:var(--paper);border-color:#f5e9cc99;width:100%;font-size:12px}.boundary{font-size:9px;color:var(--paper);line-height:1.7}
#rehearsal{width:min(1080px,92%);margin:25px auto 55px}.rehearsal-heading{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-bottom:20px}.rehearsal-heading>div{background:#f5e9cce8;padding:12px 20px;border-left:3px solid var(--gold)}.rehearsal-heading h1{font-size:30px;margin:0}.rehearsal-heading .eyebrow{margin:0 0 5px}.rehearsal-heading button{font-size:12px;white-space:nowrap}.rehearsal-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}.stage-story{color:var(--paper)}.mini-stage{position:relative;height:265px;overflow:hidden;background:radial-gradient(ellipse at 50% 100%,#d6a75e 0,#568381 35%,#183f4a 75%);border:8px solid #dec294;box-shadow:0 0 0 1px var(--ink),4px 5px 0 #173e4955}.mini-stage:after{content:'';position:absolute;bottom:0;left:0;right:0;height:15px;background:linear-gradient(#e9c380,#956741)}.mini-stage>span{position:absolute;bottom:22px;left:0;right:0;text-align:center;font:11px 'SimSun',serif;letter-spacing:.2em;opacity:.8}.stage-bird{position:absolute;width:125px;height:125px;bottom:22px;left:calc(50% - 62px);background:url('../xinsu/assets/aqi-sprites.png') 0 0/300% 200%;transform-origin:50% 85%;transition:transform .2s}.mini-stage.hit .stage-bird{transform:translateY(-12px) scale(.94,1.05);background-position:0 100%}.curtain{position:absolute;top:0;bottom:12px;width:51%;background:repeating-linear-gradient(90deg,#2d696b,#174c56 18px,#397b78 37px);border-bottom:7px solid var(--gold);transition:transform 2.2s cubic-bezier(.2,.7,.25,1);z-index:2}.curtain.left{left:0;transform:translateX(calc(var(--reveal,0) * -85%))}.curtain.right{right:0;transform:translateX(calc(var(--reveal,0) * 85%))}.beams{position:absolute;inset:0;opacity:calc(.15 + var(--reveal,0) * .85)}.beams i{position:absolute;left:15%;top:0;width:45%;height:100%;background:linear-gradient(#ffe7a0a0,#ffe7a000);clip-path:polygon(48% 0,52% 0,100% 100%,0 100%);transform:rotate(-16deg);transform-origin:50% 0}.beams i:nth-child(2){left:45%;transform:rotate(15deg)}.beams i:nth-child(3){left:0;transform:rotate(-30deg)}.beams i:nth-child(4){left:55%;transform:rotate(30deg)}.stage-caption{padding:20px;background:#173e49e6;margin-top:16px;border:1px solid #f5e9cc55}.stage-caption>span{font-size:9px;opacity:.7}.stage-caption p{font:21px/1.8 'KaiTi',serif;margin:8px 0 0}.stage-meaning{font:19px/1.9 'SimSun',serif;margin:25px 0}.live-lyric{border-top:1px solid #f5e9cc77;padding-top:17px}.live-lyric small{font-size:9px;opacity:.7}.live-lyric p{font:21px/1.8 'SimSun',serif;margin:6px 0 15px}.legend{display:flex;flex-wrap:wrap;gap:7px;font-size:9px;opacity:.8}.legend span{border:1px solid #f5e9cc55;padding:5px 7px}
.rhythm-sheet{border:1.5px solid var(--ink);background:var(--paper);box-shadow:5px 6px 0 #173e4955;overflow:hidden;align-self:start}.score-top{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;font-size:11px;border-bottom:1px solid #173e4933}.score-top b{font:23px Georgia;margin-left:5px}.score-top small{font:10px Georgia;margin-left:3px;opacity:.6}#score-canvas{display:block;width:100%;height:400px;touch-action:none}.piano-keys{display:grid;grid-template-columns:repeat(4,1fr);padding:0 7px;gap:5px;background:var(--ink)}.piano-keys button{border:0;border-bottom:5px solid #d0ba90;border-radius:0 0 4px 4px;min-height:64px;font:21px Georgia;touch-action:none;user-select:none}.piano-keys button small{display:block;font:9px sans-serif;margin-top:5px;opacity:.6}.piano-keys button.active{background:var(--gold);border-bottom-width:2px;transform:translateY(2px)}.transport{display:flex;gap:8px;padding:14px 16px 0}.transport button{font-size:12px}.transport button:first-child{background:var(--teal);color:var(--paper)}.song-progress{display:flex;align-items:center;gap:10px;padding:14px 16px 0}.song-progress progress{width:100%;height:5px;accent-color:var(--teal)}.song-progress span{font:10px Georgia;white-space:nowrap}#game-message{font-size:11px;line-height:1.9;margin:12px 16px 2px;min-height:23px}#listen{margin:0 16px 12px;font-size:10px}.result{margin:5px 16px 18px;padding:15px;border:1px solid #173e4955;background:#fff3d9}.result b{font:22px/1.5 'SimSun',serif}.result p{font-size:11px;line-height:1.9}.result button{font-size:11px;background:var(--teal);color:var(--paper)}
.opening{position:fixed;inset:0;z-index:10;background:#173e4955;backdrop-filter:blur(4px);display:grid;place-items:center;padding:35px 7%;overflow:auto;transition:opacity .7s,transform .7s}.opening.leaving{opacity:0;transform:scale(1.035);pointer-events:none}.opening-panel{background:#f5e9ccf5;box-shadow:9px 10px 0 #173e4960;display:grid;grid-template-columns:.9fr 1.2fr;gap:8%;width:min(1030px,100%);padding:60px;border:1px solid var(--ink)}.ticket{border:1px solid var(--teal);position:relative;min-height:340px;padding:28px;rotate:-5deg;background:linear-gradient(135deg,#fff3d6,#d3ddca);animation:ticketIn 1s ease-out both}.ticket:before,.ticket:after{content:'';position:absolute;top:54%;width:20px;height:30px;border-radius:50%;background:var(--paper)}.ticket:before{left:-10px}.ticket:after{right:-10px}.ticket>small{font-size:9px;letter-spacing:.1em}.ticket h2{font-size:30px;margin:28px 0 18px}.ticket p{font:19px/1.8 'KaiTi',serif}.ticket>span{font-size:11px;border-top:1px dashed var(--teal);padding-top:14px;display:block}.ticket-bird{position:absolute;right:-27px;bottom:-28px;width:140px;height:140px;background:url('../xinsu/assets/aqi-sprites.png') 0 0/300% 200%;animation:birdIn 1.4s ease-out both}.opening-copy{align-self:center}.opening-copy h1{font-size:40px}.opening-copy>p:not(.eyebrow){font-size:13px;line-height:2}.opening-copy button{margin:20px 0;background:var(--teal);color:var(--paper);font-size:13px}.opening-copy>small{display:block;font-size:9px;line-height:1.8;opacity:.65}@keyframes ticketIn{from{opacity:0;transform:translateY(30px) rotate(9deg)}}@keyframes birdIn{from{opacity:0;transform:translateX(-60px)}70%{transform:translateY(-13px)}}
.finish{width:min(700px,90%);margin:35px auto 70px;padding:38px;background:#f5e9ccf5;box-shadow:7px 8px 0 #173e4955}.finish h1{font-size:39px}.rehearsal-pass{position:relative;padding:30px 25px;border:1px solid var(--teal);background:#fff2d5}.rehearsal-pass>small{font-size:9px}.rehearsal-pass h2{font-size:32px;margin:20px 0}.rehearsal-pass blockquote{font:23px/1.9 'KaiTi',serif;margin:20px 0}.rehearsal-pass p{font-size:12px}.rehearsal-pass>span{font-size:10px}.pass-stamp{position:absolute;right:25px;bottom:35px;border:2px solid var(--red);padding:8px;color:var(--red);font:13px/1.6 'SimSun',serif;rotate:-8deg;text-align:center}.finish-copy{font-size:13px;line-height:2;margin:25px 0}.finish-actions{display:flex;gap:10px;flex-wrap:wrap}.finish-actions button{font-size:12px}.finish-actions button:first-child{background:var(--teal);color:var(--paper)}.finish>a{display:inline-block;margin-top:22px;font-size:11px}dialog{width:min(620px,90vw);max-height:90dvh;overflow:auto;border:1px solid var(--ink);padding:32px;background:var(--paper);color:var(--ink);box-shadow:6px 7px 0 #173e4955}dialog::backdrop{background:#173e49cc;backdrop-filter:blur(5px)}dialog .close{position:absolute;right:7px;top:7px;border:0;background:none;font-size:22px}dialog h2{font-size:26px;margin:0 0 20px}dialog p{font-size:12px;line-height:2}dialog a{font-size:12px;display:block;margin-top:15px;line-height:1.8}#evidence>p{padding:12px 0;border-bottom:1px solid #173e4933}#export-image{display:block;width:100%;height:auto}#download-image{background:var(--teal);color:var(--paper);padding:12px 16px;text-align:center;text-decoration:none}#toast{position:fixed;left:50%;top:90px;translate:-50% -10px;z-index:30;background:var(--ink);color:var(--paper);font-size:12px;line-height:1.8;padding:12px 18px;max-width:88vw;width:max-content;opacity:0;pointer-events:none;transition:opacity .2s,translate .2s}#toast.show{opacity:1;translate:-50% 0}
@media(max-width:760px){header{margin-inline:5%;height:72px;gap:11px}.brand{font-size:24px;gap:6px}.brand small{font-size:8px}.chapter{font-size:9px;letter-spacing:0;gap:4px}.chapter i{display:none}nav{gap:0}nav button{min-width:34px;padding:5px;font-size:11px}nav button span{display:none}#building{width:90%;margin:20px auto 40px;grid-template-columns:1fr;gap:20px}.story-column{padding:21px}.story-column h1{font-size:34px;line-height:1.3;margin:0 0 13px}.story-column h1 br{display:none}.lede{font-size:11px;margin-bottom:13px}.talk{padding:12px 0;grid-template-columns:52px 1fr}.aqi-portrait{width:50px;height:50px}.talk p{font-size:12px}.chapter-stamp{display:none}#building-canvas,#building-fallback{height:295px}.model-sheet>p{font-size:10px}.drive{padding:9px 12px;gap:10px}.drive label{gap:7px}.drive b{font-size:10px}.drive output{font-size:16px;min-width:39px}#wheel{font-size:29px}.part-tabs{gap:5px}.part-tabs button{font-size:9px;padding:8px 7px}.part-story b{font-size:18px}.part-story p{font-size:11px}.camera-controls{gap:6px}.camera-controls button{font-size:11px;min-height:40px}.camera-controls span{font-size:9px}.boundary{font-size:8px}#rehearsal{margin:18px auto 40px}.rehearsal-heading{gap:8px;margin-bottom:14px}.rehearsal-heading>div{padding:9px 12px}.rehearsal-heading h1{font-size:22px}.rehearsal-heading .eyebrow{font-size:8px}.rehearsal-heading button{font-size:9px;padding:8px;min-height:44px}.rehearsal-grid{grid-template-columns:1fr;gap:15px}.stage-story{display:grid;grid-template-columns:120px 1fr;gap:10px;align-items:center}.mini-stage{height:108px;border-width:4px}.stage-bird{width:65px;height:65px;left:calc(50% - 32px);bottom:14px}.mini-stage>span{display:none}.stage-caption{margin:0;padding:11px}.stage-caption>span{font-size:8px}.stage-caption p{font-size:14px;line-height:1.8;margin:4px 0 0}.stage-meaning,.legend{display:none}.live-lyric{grid-column:1/-1;padding:8px 11px;border-top:0;background:#173e49e6}.live-lyric small{font-size:8px}.live-lyric p{font-size:16px;line-height:1.6;margin:3px 0 2px}#score-canvas{height:300px}.score-top{padding:10px 14px}.score-top b{font-size:20px}.piano-keys{gap:4px;padding-inline:5px}.piano-keys button{min-height:58px;font-size:18px}.piano-keys button small{font-size:8px}.transport{padding:12px 12px 0}.transport button{font-size:11px;padding:9px 12px}.song-progress{padding:11px 12px 0}#game-message{font-size:10px;margin-inline:12px;line-height:1.8}#listen{font-size:9px;margin-inline:12px}.result{margin-inline:12px}.result b{font-size:20px}.opening{padding:25px 6%;place-items:center}.opening-panel{display:flex;flex-direction:column;gap:30px;padding:32px 25px}.ticket{min-height:220px;width:83%;padding:21px;align-self:center}.ticket h2{font-size:24px;margin:20px 0 11px}.ticket p{font-size:15px;margin:10px 0 18px}.ticket>small{font-size:8px}.ticket>span{font-size:10px;padding-top:10px}.ticket-bird{width:105px;height:105px;right:-31px;bottom:-17px}.opening-copy h1{font-size:31px;line-height:1.4;margin-bottom:15px}.opening-copy>p:not(.eyebrow){font-size:12px}.opening-copy button{margin:10px 0 16px;font-size:12px}.opening-copy .eyebrow{font-size:8px}.opening-copy>small{font-size:8px}.finish{margin-top:22px;padding:26px 22px}.finish h1{font-size:32px}.rehearsal-pass{padding:24px 19px}.rehearsal-pass h2{font-size:28px}.rehearsal-pass blockquote{font-size:22px}.pass-stamp{right:15px;bottom:48px;font-size:11px;padding:6px}.finish-copy{font-size:12px}.finish-actions{gap:7px}.finish-actions button{font-size:11px;padding:10px 12px}dialog{padding:30px 22px}dialog h2{font-size:23px}}
#score-canvas{height:clamp(190px,32dvh,320px)}
#stop-run,#session-sound{display:none}
.beams i{--a:-16deg}.beams i:nth-child(2){--a:15deg}.beams i:nth-child(3){--a:-30deg}.beams i:nth-child(4){--a:30deg}
body[data-session=true] .beams i{animation:sway 6s ease-in-out infinite alternate}
@keyframes sway{from{transform:rotate(calc(var(--a) - 4deg))}to{transform:rotate(calc(var(--a) + 4deg))}}
@media(max-width:760px){
 #score-canvas{height:300px}
 body[data-session=true] header,body[data-session=true] .rehearsal-heading{display:none}
 body[data-session=true] #rehearsal{margin:9px auto 30px;width:94%}
 body[data-session=true] .rehearsal-grid{gap:10px}
 body[data-session=true] .stage-story{display:flex;gap:9px;align-items:stretch}
 body[data-session=true] .mini-stage{height:77px;flex:0 0 100px}
 body[data-session=true] .stage-bird{width:55px;height:55px;left:calc(50% - 27px);bottom:9px}
 body[data-session=true] .stage-caption{display:none}
 body[data-session=true] .live-lyric{flex:1;min-width:0;padding:9px}
 body[data-session=true] .live-lyric p{font-size:14px;line-height:1.65}
 body[data-session=true] #score-canvas{height:clamp(200px,40dvh,370px)}
 body[data-session=true] #stop-run,body[data-session=true] #session-sound{display:block}
 body[data-session=true] #session-sound{font-size:13px;min-width:44px;padding-inline:8px}
 body[data-session=true] #session-sound span{font-size:9px}
}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.leaves{display:none}}