@charset "UTF-8";
:root{--ink:#171916;--paper:#f8f9f5;--line:#363b32;--muted:#a5ae9c;--acid:#deff65;color-scheme:dark;font-family:'Avenir Next','PingFang SC','Hiragino Sans GB',sans-serif;font-synthesis:none;letter-spacing:0}
*{box-sizing:border-box}body{margin:0;background:var(--ink);color:var(--paper)}button,a,input{-webkit-tap-highlight-color:transparent}button,a{color:inherit}button{font:inherit;cursor:pointer}button:disabled{opacity:.3;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible{outline:2px solid var(--acid);outline-offset:4px}a{text-decoration:none}button{border:0;background:none}svg{width:21px;height:21px;flex-shrink:0;display:block}button[aria-pressed=true]{color:var(--acid)}
.mast{height:88px;display:flex;align-items:center;justify-content:space-between;padding:0 38px;border-bottom:1px solid var(--line);gap:24px}.signature{font-weight:800;font-style:italic;font-size:35px;line-height:1}.signature b{color:var(--acid)}.mast-id{display:flex;align-items:center;gap:26px}.mast-model{border-left:1px solid #52574a;padding-left:26px;font-size:15px}.edition{font-family:'Avenir Next',sans-serif;font-size:10px;color:var(--muted)}.mast-links{display:flex;align-items:center;gap:24px;font-size:12px}.mast-links a{display:flex;gap:8px;align-items:center}.mast-links .icon{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line)}
.chapters{display:grid;grid-template-columns:repeat(4,1fr);padding:0 38px;border-bottom:1px solid var(--line)}.chapter{padding:21px 0;display:flex;align-items:center;gap:14px;text-align:left;position:relative}.chapter .n{font-family:'DIN Alternate','Avenir Next',sans-serif;font-size:23px;color:#7f8974}.chapter strong{font-size:13px;font-weight:500}.chapter small{display:block;font-size:8px;color:var(--muted);margin-top:4px}.chapter[aria-selected=true]:after{content:'';position:absolute;left:0;right:24px;bottom:0;height:3px;background:var(--acid)}.chapter[aria-selected=true] .n{color:var(--acid)}
.workspace{display:grid;grid-template-columns:1fr 370px;min-height:620px;height:calc(100svh - 235px);max-height:1000px}.visual{background:#fff;position:relative;color:var(--ink);min-width:0;overflow:hidden;display:grid;grid-template-rows:51px 1fr 47px}.visual-bar,.visual-foot{padding:0 28px;display:flex;align-items:center;justify-content:space-between;z-index:2;font-size:9px;letter-spacing:0;border-color:#e7eae1}.visual-bar{border-bottom:1px solid #e7eae1}.visual-foot{border-top:1px solid #e7eae1;color:#697061}.visual-bar strong{font-size:11px;font-weight:500}.visual .icon{width:34px;height:34px;display:grid;place-items:center;background:#f1f3eb;color:#1b2018}.art-tools{display:flex;gap:6px}.drawing{position:relative;min-height:0;display:flex;align-items:center;justify-content:center;overflow:hidden;touch-action:pan-y}.drawing.zoomed{touch-action:none;cursor:grab}.drawing.zoomed:active{cursor:grabbing}.drawing img{display:block;max-width:82%;max-height:91%;width:auto;height:auto;object-fit:contain;transform:translate(var(--pan-x,0px),var(--pan-y,0px)) scale(var(--scale,1));transform-origin:center;transition:transform .45s cubic-bezier(.2,.7,.2,1);user-select:none;-webkit-user-drag:none}.drawing.dragging img{transition:none}.drawing img.enter{animation:art-in .7s cubic-bezier(.2,.7,.2,1) both}.figure-no{position:absolute;bottom:20px;left:28px;font:10px 'Avenir Next',sans-serif;color:#78806e}.figure-no:before{content:'+';margin-right:10px;color:#9fa78f}.micro{font-size:8px;color:#828b77}.visual:before{content:'';position:absolute;left:12px;top:70px;bottom:70px;width:5px;background:repeating-linear-gradient(to bottom,#bec5b5 0 1px,transparent 1px 14px);z-index:2}.timer-track{position:absolute;left:0;right:0;bottom:0;height:3px;background:#eef0e9;z-index:4}.timer-track i{display:block;height:100%;width:0;background:#a4c132;transition:width .1s linear}
.instruction{display:flex;flex-direction:column;min-height:0;padding:30px 32px 22px;overflow:auto;border-bottom:1px solid var(--line)}.step-code{display:flex;justify-content:space-between;align-items:start}.huge-no{font-family:'DIN Alternate','Avenir Next',sans-serif;font-size:64px;line-height:1;color:var(--acid);font-weight:600}.step-over{color:var(--muted);font-size:10px;padding-top:9px}.instruction h1{font-size:25px;line-height:1.35;margin:25px 0 8px;font-weight:600}.en{font-size:8px;color:var(--muted);line-height:1.5}.body-copy{font-size:13px;line-height:1.9;margin-top:20px;color:#e0e5d9}.body-copy p{margin:0 0 13px}.spec{display:flex;align-items:start;gap:12px;margin-top:12px;border-top:1px solid var(--line);padding-top:15px;color:var(--muted);font-size:11px;line-height:1.6}.spec span{font:9px 'Avenir Next';min-width:51px;padding-top:2px}.torque{margin-top:22px;border-left:2px solid var(--acid);padding-left:16px}.torque small{font-size:10px;color:var(--muted);display:block}.torque strong{font-family:'DIN Alternate','Avenir Next',sans-serif;font-size:47px;font-weight:600;line-height:1.3;color:var(--acid)}.torque em{font-size:12px;font-style:normal;margin-left:8px;color:var(--muted)}.note{font-size:11px;line-height:1.85;color:#d7e6b7;border-top:1px solid #4b553c;margin-top:21px;padding-top:14px}.extra{font-size:11px;line-height:1.8;color:var(--muted);margin-top:10px}.mark{margin-top:auto;padding-top:24px}.mark button{display:flex;align-items:center;justify-content:space-between;border:1px solid #626b56;padding:13px 15px;width:100%;font-size:11px}.mark button.done{border-color:var(--acid);color:var(--acid)}.mark svg{width:17px;height:17px}
.transport{height:76px;display:flex;align-items:center;gap:25px;padding:0 38px;border-top:1px solid var(--line)}.transport .icon{width:38px;height:38px;display:grid;place-items:center}.play{background:var(--acid);color:#171916;border-radius:50%;width:42px!important;height:42px!important}.step-dots{display:flex;align-items:center;flex:1;gap:6px;min-width:0}.step-dots button{flex:1;max-width:90px;height:30px;position:relative;padding:0}.step-dots button:after{content:'';position:absolute;left:0;right:0;top:14px;height:3px;background:#444b3d}.step-dots button.current:after{height:5px;top:13px;background:var(--acid)}.step-dots button.complete:after{background:#8a9d69}.total{font-size:10px;white-space:nowrap;color:var(--muted)}.bottomline{display:flex;align-items:center;justify-content:space-between;font-size:9px;color:var(--muted);padding:16px 38px;border-top:1px solid var(--line)}.bottomline button{font-size:9px;color:var(--muted);padding:0}.bottomline a{color:#eef4df}
dialog{border:0;padding:0;max-width:none;max-height:none;width:94vw;height:92svh;background:#f8f9f5;color:#171916;overflow:auto}dialog::backdrop{background:#080a07e8;backdrop-filter:blur(8px)}.dialog-header{height:60px;padding:0 25px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;background:#f8f9f5;z-index:3;border-bottom:1px solid #d5dbc9;font-size:12px}.dialog-header button{width:36px;height:36px;display:grid;place-items:center}.dialog-art{height:calc(100% - 60px);padding:20px;display:flex;align-items:center;justify-content:center}.dialog-art img{max-width:100%;max-height:100%;object-fit:contain}.reference-pages{padding:25px;display:grid;gap:30px}.reference-pages img{width:100%;background:#fff}.reference-pages a{font-size:10px;color:#67725a}.spacer-table{margin-top:18px;width:100%;border-collapse:collapse;font-size:10px}.spacer-table th,.spacer-table td{text-align:left;padding:7px 0;border-bottom:1px solid var(--line)}.spacer-table th{font-weight:500;color:var(--muted)}
@keyframes art-in{from{opacity:0;filter:blur(5px);transform:translateY(10px)}to{opacity:1;filter:blur(0);transform:translateY(0)}}@keyframes text-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}.instruction.enter>*{animation:text-in .4s both}.instruction.enter>*:nth-child(3){animation-delay:.04s}.instruction.enter>*:nth-child(4){animation-delay:.08s}
@media(min-width:1700px){.workspace{grid-template-columns:1fr 430px}.instruction{padding:40px}.instruction h1{font-size:28px}.body-copy{font-size:15px}}
@media(max-width:900px){.mast{padding:0 20px;height:72px}.edition{display:none}.mast-model{padding-left:18px}.mast-id{gap:18px}.mast-links{gap:14px}.chapters{padding:0 20px}.chapter{gap:8px}.chapter strong{font-size:11px}.chapter small{font-size:7px}.workspace{grid-template-columns:1fr 320px;height:auto;min-height:650px}.instruction{padding:25px}.transport{padding:0 20px;gap:12px}.bottomline{padding:16px 20px}}
@media(max-width:640px){.mast{height:66px;padding:0 18px}.signature{font-size:29px}.mast-model{font-size:12px;padding-left:14px}.mast-id{gap:14px}.mast-links .linktext{display:none}.mast-links{gap:14px}.mast-links a svg{width:18px}.chapters{padding:0 16px}.chapter{padding:16px 0;gap:7px}.chapter .n{font-size:17px}.chapter strong{font-size:10px}.chapter small{display:none}.chapter[aria-selected=true]:after{right:10px}.workspace{display:flex;flex-direction:column;min-height:0;height:auto}.visual{height:49svh;min-height:330px;max-height:550px;grid-template-rows:43px 1fr 37px}.visual-bar,.visual-foot{padding:0 18px;font-size:8px}.visual-bar strong{font-size:10px}.drawing img{max-height:88%;max-width:79%}.figure-no{left:18px;font-size:8px;bottom:12px}.visual:before{left:6px;top:60px;bottom:50px;width:3px}.instruction{padding:26px 24px 30px;overflow:visible}.huge-no{font-size:48px}.instruction h1{font-size:26px;margin:16px 0 8px}.step-code{align-items:center}.body-copy{font-size:14px;margin-top:18px}.torque strong{font-size:44px}.mark{padding-top:22px}.transport{position:sticky;bottom:0;background:#171916f5;backdrop-filter:blur(15px);z-index:10;padding:0 14px;height:68px;gap:6px}.transport .icon{width:32px;height:32px}.play{width:37px!important;height:37px!important}.step-dots{gap:4px}.total{font-size:8px}.bottomline{padding:16px 18px;gap:15px;line-height:1.6}.bottomline .source-name{max-width:200px}.spacer-table{font-size:12px}dialog{width:100vw;height:100svh}.dialog-header{padding:0 18px}.reference-pages{padding:12px;gap:20px}.reference-pages img{min-width:1100px}.reference-pages{overflow:auto}.dialog-art{padding:10px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{body{background:white;color:black}.mast,.chapters,.transport,.bottomline,.mark,.art-tools{display:none}.workspace{height:auto;display:block}.visual{height:140mm}.instruction{color:black;overflow:visible}.body-copy,.note,.extra,.en,.step-over{color:black}.torque strong,.huge-no{color:#374719}}
.drawing img{width:85%;height:90%;max-width:85%;max-height:90%}.dialog-art img{width:100%;height:100%}
@media(max-width:640px){.signature{font-size:24px}.mast-id{gap:10px}.mast-model{font-size:10px;padding-left:10px}.mast-links{gap:8px}}
.mobile-scene-nav{display:none}.art-picture{display:flex;align-items:center;justify-content:center;width:100%;height:100%;min-width:0}
@media screen and (max-width:640px){.workspace{max-height:none}.visual{flex-shrink:0}.mast-model{display:block;font-size:16px;padding-left:10px}.mast-mode{display:none}.mast-links{gap:4px}.mast-id{gap:8px}}
@media screen and (max-width:640px){
  body{font-size:18px}.mast{height:64px;padding:0 16px;gap:8px}.signature{font-size:25px}.mast-model{display:block;font-size:16px;padding-left:10px}.mast-links{gap:4px}.mast-links a{min-width:44px;min-height:44px;justify-content:center}.mast-links a svg{width:22px;height:22px}.mast-links .icon{width:44px;height:44px}
  .chapters{grid-template-columns:repeat(2,minmax(0,1fr));padding:0 16px}.chapter{padding:12px 8px;min-height:54px;gap:10px}.chapter .n{font-size:17px}.chapter strong{font-size:16px;line-height:1.5}.chapter[aria-selected=true]:after{right:8px;height:3px}.chapter:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .mobile-scene-nav{display:flex;align-items:center;gap:6px;padding:7px 12px;position:sticky;top:0;z-index:12;background:var(--ink);border-bottom:1px solid var(--line)}.mobile-scene-nav button{width:44px;height:48px;display:grid;place-items:center;flex-shrink:0}.mobile-scene-nav select{width:100%;min-width:0;background:var(--ink);color:var(--paper);border:0;font:16px inherit;min-height:48px;padding:8px 4px;font-family:inherit;font-size:16px}
  .workspace{scroll-margin-top:64px}.instruction{display:contents}.instruction>*{order:6;margin-left:20px;margin-right:20px}.step-code{order:1;margin-top:24px}.huge-no{font-size:34px}.step-over{font-size:14px;padding:0}.instruction h1{order:2;font-size:27px;line-height:1.45;margin:12px 20px 0}.instruction .en{display:none}.body-copy{order:3;font-size:18px;line-height:1.85;margin:16px 20px 22px}.body-copy p{margin-bottom:14px}
  .visual{order:4;height:auto;min-height:0;max-height:none;grid-template-rows:58px auto 52px}.visual-bar,.visual-foot{padding:0 14px;font-size:13px;line-height:1.5;gap:12px}.visual-bar strong{font-size:15px}.visual-foot span:first-child{min-width:0}.visual-foot span:last-child{white-space:nowrap}.visual .icon{width:44px;height:44px}.visual:before,.figure-no{display:none}.drawing{min-height:180px}.art-picture{height:auto}.drawing img{width:100%;height:auto;max-width:none;max-height:none;object-fit:contain}.spec{font-size:17px;line-height:1.8;margin-top:24px;padding-top:16px;gap:14px;flex-direction:column}.spec span{font-size:14px}.torque{order:5;margin-top:26px;padding-left:16px}.torque small{font-size:16px;line-height:1.7}.torque strong{font-size:48px}.torque em{font-size:16px}.note{order:7;font-size:16px;line-height:1.85;margin-top:24px;padding-top:18px}.extra{order:8;font-size:16px;line-height:1.85}.spacer-table{order:9;margin-top:22px;width:calc(100% - 40px);font-size:16px}.spacer-table th,.spacer-table td{padding:12px 0}.mark{order:10;margin:0 20px 24px;padding-top:26px}.mark button{font-size:16px;min-height:52px;padding:14px}
  .transport{position:static;height:auto;min-height:84px;padding:16px 12px;gap:8px;backdrop-filter:none}.transport .icon{width:44px;height:48px}.play{width:46px!important;height:46px!important}.step-dots{display:none}.total{margin-left:auto;font-size:16px}.bottomline{font-size:13px;line-height:1.8;flex-wrap:wrap;padding:18px 20px}.bottomline .source-name{max-width:none;width:100%}.bottomline button{font-size:15px;min-height:44px}.bottomline a{font-size:15px;min-height:44px;display:flex;align-items:center}.dialog-header{height:72px;font-size:17px;padding:0 16px;gap:12px}.dialog-header button{width:48px;height:48px;flex-shrink:0}.dialog-art{height:auto;min-height:0;display:block;padding:8px}.dialog-art img{width:100%;height:auto;max-height:none}.reference-pages a{font-size:15px}
}