:root{color-scheme:dark;--bg:#101413;--panel:#181d1b;--text:#eef1e8;--muted:#a4aea8;--line:#343d36;--accent:#c3ee76}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Noto Sans TC",sans-serif}header{height:76px;padding:0 4%;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}a{color:inherit}.brand{text-decoration:none;font-weight:650;letter-spacing:.08em}.brand span{font-size:14px;color:var(--muted);font-weight:400}.edition,.eyebrow,footer{font-family:ui-monospace,monospace;letter-spacing:.12em;font-size:12px}.edition{color:var(--muted)}.edition b{color:var(--accent);margin-left:20px}main{display:grid;grid-template-columns:minmax(0,1fr) 350px;min-height:calc(100svh - 120px)}.workspace{position:relative;min-height:730px;background:radial-gradient(ellipse at 50% 52%,#303932 0%,#18201c 40%,#101413 78%);overflow:hidden}.heading{position:absolute;left:5.5%;top:30px;pointer-events:none;z-index:1}.eyebrow{color:var(--accent)}h1{font-size:clamp(40px,4.5vw,68px);font-weight:600;line-height:1.1;letter-spacing:-.06em;margin:12px 0}h1 span{font-weight:300;color:#d3ccb9}.heading>p:last-child{color:var(--muted);font-size:15px;margin:12px 0}#viewport{position:absolute;inset:0;touch-action:none;outline-offset:-4px}canvas{display:block;width:100%;height:100%}.viewtools{position:absolute;right:24px;top:30px;display:flex;flex-direction:column;gap:6px}.viewtools button{font-size:13px;padding:7px 12px;background:#161e19cc;backdrop-filter:blur(12px)}button,select{font:inherit;color:inherit;background:transparent;border:1px solid var(--line);border-radius:7px;padding:10px 12px;cursor:pointer}button:hover{background:#303a30;border-color:#8ca276}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}button[aria-pressed=true]{background:#c3ee7615;color:var(--accent);border-color:var(--accent)}button:disabled,fieldset:disabled{opacity:.55}#loading{position:absolute;left:50%;top:53%;transform:translate(-50%,-50%);background:var(--panel);padding:20px;border:1px solid var(--line);border-radius:10px;text-align:center;max-width:90%;min-width:240px}#loading strong{display:block;color:var(--accent)}.hint{position:absolute;bottom:25px;left:5.5%;font-size:13px;color:var(--muted);pointer-events:none}.hint span{display:block;font-size:12px}.stage-badge{position:absolute;right:24px;bottom:28px;font:12px ui-monospace,monospace;color:var(--accent);letter-spacing:.1em}aside{border-left:1px solid var(--line);background:var(--panel);padding:30px 28px}.panel-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}.panel-title>span:last-child{font-size:14px;color:var(--muted)}fieldset{border:0;padding:0;margin:0;min-width:0}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.steps button{padding:12px 0;font-size:15px}.steps small{display:block;font:12px ui-monospace,monospace;margin-bottom:3px;opacity:.65}.range-label{display:flex;justify-content:space-between;margin-top:28px;margin-bottom:13px;font-size:14px}output{color:var(--accent);font-family:monospace}input[type=range]{width:100%;height:28px;accent-color:var(--accent);cursor:ew-resize}.range-ends{display:flex;justify-content:space-between;color:var(--muted);font-size:12px}.play-row{display:grid;grid-template-columns:1.2fr 1fr;gap:8px;margin-top:22px}.play-row button{font-size:14px}.primary{background:var(--accent);color:#15200c;border-color:var(--accent);font-weight:650}.primary:hover{background:#d4fa97}.divider{height:1px;background:var(--line);margin:26px 0}.toggle{display:flex;gap:10px;align-items:center;font-size:14px}.toggle input{accent-color:var(--accent);width:17px;height:17px}.mode-row{display:flex;gap:8px;align-items:center;margin:20px 0;font-size:14px}.mode-row>span{margin-right:auto;color:var(--muted)}.mode-row button{padding:5px 10px;font-size:13px}.part-label{display:block;font-size:14px;margin:24px 0 8px}.part-label span{display:block;color:var(--muted);font-size:12px}select{width:100%;background:var(--bg);font-size:14px}.part-info{border-left:2px solid var(--accent);padding-left:17px;margin:27px 0}.part-info h2{font-size:19px;font-weight:500;margin:8px 0}.part-info p{font-size:14px;color:var(--muted);margin:0;line-height:1.8}details{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:18px}summary{cursor:pointer;color:var(--text)}details a{display:block;margin:8px 0;text-underline-offset:4px}footer{min-height:44px;display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 4%;border-top:1px solid var(--line);color:var(--muted);font-size:11px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(max-width:850px){main{grid-template-columns:1fr}.workspace{min-height:65svh}.heading{top:18px}h1{font-size:42px}.heading>p:last-child{font-size:13px}.viewtools{top:22px;right:15px}.viewtools button{font-size:12px}aside{border-left:0;border-top:1px solid var(--line);padding:24px}.panel-title{margin-bottom:15px}.hint{bottom:16px;font-size:12px}.stage-badge{bottom:65px;right:15px}.part-label span{display:inline;margin-left:10px}header{height:64px}.edition{font-size:10px}.brand span{display:none}footer{font-size:10px;flex-wrap:wrap}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}}

/* Keep text and controls outside the model canvas at every screen size. */
.workspace{display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto minmax(400px,1fr) auto auto;align-content:start;min-height:730px;overflow:hidden}
.heading{position:static;grid-row:1;padding:26px 5.5% 12px;pointer-events:auto}
h1{font-size:clamp(36px,4vw,58px)}
.viewtools{position:static;grid-row:2;flex-direction:row;flex-wrap:wrap;padding:0 5.5% 12px;gap:8px}
#viewport{position:relative;inset:auto;grid-row:3;min-width:0;min-height:0;width:100%;height:100%;overflow:hidden}
canvas{position:absolute;inset:0}
.stage-badge{position:static;grid-row:4;padding:12px 5.5% 0;text-align:right}
.hint{position:static;grid-row:5;padding:10px 5.5% 22px;line-height:1.8}
#loading{top:55%;z-index:2}
@media(max-width:850px){
 .workspace{min-height:0;grid-template-rows:auto auto clamp(330px,52svh,520px) auto auto}
 .heading{padding:20px 24px 10px}.heading .eyebrow{margin:0 0 10px}h1{font-size:38px;margin:0}.heading>p:last-child{margin:8px 0 0}
 .viewtools{padding:4px 24px 12px;gap:6px}.viewtools button{flex:1;padding:9px 6px;font-size:13px;white-space:nowrap}
 .stage-badge{padding:8px 24px 0}.hint{padding:8px 24px 18px}.hint span{font-size:12px}
}
@media(max-width:360px){.viewtools{display:grid;grid-template-columns:1fr 1fr}}
/* Short landscape screens need a full-width stage, not a compressed desktop column. */
@media(orientation:landscape) and (max-height:600px) and (max-width:1200px){
 header{height:52px}
 main{grid-template-columns:minmax(0,1fr);min-height:0}
 .workspace{min-height:0;grid-template-rows:auto auto minmax(420px,80svh) auto auto}
 .heading{display:flex;align-items:baseline;flex-wrap:wrap;gap:10px 20px;padding:16px 24px 8px}
 .heading .eyebrow{margin:0}.heading h1{font-size:32px;margin:0}.heading>p:last-child{margin:0;font-size:14px}
 .viewtools{flex-direction:row;flex-wrap:wrap;padding:0 24px 8px;gap:8px}
 .viewtools button{flex:0 1 auto;min-width:86px;padding:8px 12px;font-size:14px}
 .stage-badge{padding:8px 24px 0}.hint{padding:8px 24px 16px}
 aside{border-left:0;border-top:1px solid var(--line);padding:24px;min-width:0}
}