:root{--ink:#2b2c29;--muted:#7d7e78;--line:#dcddd7;--wood:#684737;--paper:#f6f6f2;--serif:'Songti SC','STSong','Noto Serif SC',serif;font-family:'PingFang SC','Microsoft YaHei',system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,a,input{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{font:inherit;cursor:pointer;color:inherit}a{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid #925f42;outline-offset:4px}button:disabled,input:disabled{opacity:.4;cursor:wait}button{border:0;background:none}button:hover{color:var(--wood)}.topbar{position:relative;height:84px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 40px;background:#fafaf7}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:23px;font-family:var(--serif);letter-spacing:3px}.brandmark{display:grid;place-items:center;width:37px;height:37px;border:1px solid #9a8a7e;font-size:24px;letter-spacing:0}.brand-en{font-family:Arial,sans-serif;font-size:10px;letter-spacing:3px;display:block;margin-top:3px}.header-caption{position:absolute;left:50%;transform:translateX(-50%);white-space:nowrap;font-size:13px;color:var(--muted);letter-spacing:3px}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 336px;min-height:calc(100svh - 84px);max-width:2000px;margin:auto}.viewer{position:relative;min-height:540px;height:calc(100svh - 84px);max-height:1150px;overflow:hidden;background:radial-gradient(ellipse at 46% 43%,#f7f7f3 0,#eeefea 65%,#e9ebe5 100%)}#viewport{position:absolute;inset:80px 0 155px;touch-action:none}#viewport canvas{display:block;width:100%;height:100%;outline:none}.intro{position:absolute;top:35px;left:40px;z-index:2;pointer-events:none}.eyebrow{font-size:12px;letter-spacing:2px;color:#75776f}.index-tag{font-size:10px;border:1px solid #c4c7be;padding:4px 6px;letter-spacing:1px;margin-right:12px}h1{font:400 clamp(28px,2.4vw,40px)/1.5 var(--serif);letter-spacing:2px;margin:19px 0 4px}h1 span{display:inline-block;font:400 13px/1.5 'PingFang SC',sans-serif;letter-spacing:2px;border-left:1px solid #b8bbb1;padding-left:14px;margin-left:18px;vertical-align:middle}.intro p{font-size:13px;color:var(--muted);letter-spacing:1px;margin:0}.scene-label{position:absolute;left:40px;top:225px;font-size:12px;letter-spacing:2px;color:#8b8e84;display:flex;align-items:center;gap:9px;pointer-events:none}.small-rule{width:23px;height:1px;background:#9ea294}.view-tools{position:absolute;top:35px;right:30px;display:flex;border:1px solid #d3d6cd;border-radius:5px;padding:3px;background:#f5f6f1aa;z-index:3}.view-button{font-size:12px;padding:7px 10px;border-radius:3px;color:#86897e}.view-button.active{background:#fff;color:#514239;box-shadow:0 1px 4px #0000000a}.interaction-hint{position:absolute;bottom:173px;left:0;right:0;display:flex;justify-content:center;align-items:center;gap:8px;color:#868a7f;font-size:11px;letter-spacing:1px;pointer-events:none}.explosion-panel{position:absolute;bottom:48px;left:50%;transform:translateX(-50%);width:min(520px,calc(100% - 80px));padding:17px 22px 17px;border:1px solid #dcded5;border-radius:10px;background:#fafbf8e8;box-shadow:0 8px 30px #464b3610;backdrop-filter:blur(10px)}.playback{display:flex;align-items:center;gap:12px}.play-button{border-radius:50%;height:34px;width:34px;background:#554337;color:#fff;display:grid;place-items:center;flex-shrink:0}.play-button:hover{background:#76533d;color:#fff}.playback label{font-size:13px;letter-spacing:1px}.playback>div>span{display:block;font-size:10px;color:#929588;margin-top:3px;letter-spacing:.4px}.reset-button{margin-left:auto;color:#767a6d;font-size:12px;display:flex;gap:6px;align-items:center;padding:8px}.reset-button span{font-size:21px}.range-row{display:flex;align-items:center;gap:13px;margin-top:13px;font-size:11px;color:#8b8e84}.range-row input{width:100%;min-width:0;accent-color:#67503d;height:4px;cursor:pointer;appearance:none;border-radius:5px;background:linear-gradient(to right,#78573d var(--progress,0%),#dfe2d8 var(--progress,0%))}.range-row input::-webkit-slider-thumb{appearance:none;width:13px;height:13px;background:#fbfcf8;border:2px solid #74583e;border-radius:50%;box-shadow:0 0 0 4px #fafbf844}.range-row input::-moz-range-thumb{width:10px;height:10px;background:#fbfcf8;border:2px solid #74583e;border-radius:50%}.range-row>span{white-space:nowrap}output{font-family:Georgia,serif;font-size:24px;min-width:52px;text-align:right;color:#665442;line-height:1}output span{font-family:Arial;font-size:11px;color:#979b8c;margin-left:2px}.viewer-foot{position:absolute;bottom:17px;left:40px;right:30px;display:flex;justify-content:space-between;color:#92958b;font-size:10px;letter-spacing:1px}.sidebar{border-left:1px solid var(--line);padding:32px 27px 20px;background:#fafaf7;height:calc(100svh - 84px);min-height:540px;max-height:1150px;overflow:auto;scrollbar-width:thin;scrollbar-color:#d3d6cc transparent}.sidebar-head{display:flex;align-items:center;justify-content:space-between}.part-total{font-size:11px;color:#91958a}.detail{padding:31px 0 25px;border-bottom:1px solid var(--line)}.detail-number{font-family:Georgia,serif;color:#a09b90;font-size:16px}.detail h2{font:400 29px/1.4 var(--serif);letter-spacing:1px;margin:15px 0 7px}.part-en{font-size:9px;letter-spacing:1.6px;color:#9a9d92}.detail p{font-size:13px;line-height:1.95;color:#7c8075;margin:24px 0 26px;min-height:76px}.detail-meta{display:flex;justify-content:space-between;font-size:10px;color:#92968a;gap:10px}.detail-meta strong{font-weight:400;color:#656b5d}.parts-heading{display:flex;align-items:center;justify-content:space-between;margin:25px 0 17px}.parts-heading h3{font-size:13px;font-weight:500;letter-spacing:1px;margin:0}.parts-heading>span{font-size:9px;letter-spacing:1.4px;color:#979c90}.parts-list details{border-top:1px solid #e5e7df}.parts-list summary{padding:15px 0;cursor:pointer;display:flex;align-items:center;justify-content:space-between;font-size:12px;color:#5a6253;list-style:none}.parts-list summary::-webkit-details-marker{display:none}.group-count{font:11px Arial;color:#a0a596}.group-count::after{content:'+';font-size:16px;margin-left:14px}.parts-list details[open] .group-count::after{content:'−'}.part-button{display:flex;align-items:center;gap:13px;width:100%;padding:10px 11px;font-size:12px;text-align:left;border-radius:4px;margin-bottom:3px;color:#79806f;transition:background .2s}.part-button .part-id{font-family:Georgia;font-size:11px;color:#a1a693}.part-button .part-status{margin-left:auto;display:none;font-size:11px;font-weight:400;white-space:nowrap;padding:2px 5px;border:1px solid #b99b75;border-radius:3px;color:#ffe8bc}.part-button.selected{background:#65412d;color:#fff;font-weight:600;box-shadow:inset 4px 0 #e8b35c}.part-button.selected .part-status{display:inline-block}.part-button.selected .part-id{color:#ffe0ab}.part-button.selected:hover{background:#76503a;color:#fff}.part-button:hover{background:#f0f1e9}.sidebar-note{border-top:1px solid var(--line);margin-top:20px;display:flex;gap:11px;padding-top:17px}.sidebar-note p{font-size:10px;color:#969b8d;line-height:1.8;margin:0}.note-symbol{font:italic 13px Georgia;border:1px solid #bec4b5;border-radius:50%;width:15px;height:15px;text-align:center;color:#9da592;flex-shrink:0;margin-top:2px}.load-state{position:absolute;inset:260px 20px 200px;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:4;pointer-events:none;color:#797d71;font-size:14px}.load-state[hidden]{display:none}.load-state button{pointer-events:auto;border:1px solid #b8bbaa;padding:10px 20px;border-radius:4px}.load-state p{font-size:12px}.spinner{width:23px;height:23px;border:2px solid #d6dace;border-top-color:#6a533e;border-radius:50%;animation:spin 1s linear infinite;margin-bottom:18px}@keyframes spin{to{transform:rotate(360deg)}}.noscript{position:fixed;inset:45% 20%;padding:24px;background:white;z-index:10;text-align:center}
@media(min-width:1600px){.workspace{grid-template-columns:minmax(0,1fr) 380px}.sidebar{padding:35px}.intro{left:52px}#viewport{inset:60px 0 155px}}
@media(max-width:1000px){.workspace{grid-template-columns:minmax(0,1fr) 290px}.topbar{padding:0 25px}.intro{left:25px}.intro h1{font-size:28px}.intro h1 span{display:block;border:0;padding:0;margin:7px 0 0}.intro p{display:none}.view-tools{right:20px}.sidebar{padding:28px 20px}.scene-label{left:25px;top:230px}.explosion-panel{width:calc(100% - 44px)}.viewer-foot{left:25px}.detail h2{font-size:25px}}
@media(max-width:760px){.topbar{height:68px;padding:0 20px}.brand{font-size:20px;gap:9px}.brandmark{width:32px;height:32px;font-size:22px}.brand-en{font-size:8px}.header-caption{display:none}.workspace{display:block}.viewer{height:740px;min-height:0;max-height:none}.intro{top:28px;left:22px}.intro h1{font-size:29px;margin-top:17px}.intro h1 span{display:inline-block;border-left:1px solid #b8bbb1;padding-left:12px;margin:0 0 0 12px;font-size:12px}.eyebrow{font-size:10px}.index-tag{font-size:9px}.view-tools{top:154px;right:20px}.view-button{font-size:11px;padding:6px 9px}.scene-label{top:168px;left:22px;font-size:10px}#viewport{inset:142px 0 160px}.interaction-hint{font-size:10px;bottom:178px}.explosion-panel{bottom:49px;width:calc(100% - 40px);padding:16px 18px}.viewer-foot{left:22px;right:22px;font-size:9px}.sidebar{height:auto;max-height:none;min-height:0;border-left:0;border-top:1px solid var(--line);padding:28px 24px 30px}.sidebar-head .eyebrow{font-size:12px}.detail{padding-top:22px}.detail h2{font-size:29px}.detail p{font-size:14px;margin:19px 0;min-height:0}.part-en{font-size:10px}.detail-meta{font-size:12px}.parts-list summary,.part-button{font-size:14px}.part-button{padding:12px}.sidebar-note p{font-size:12px}.parts-heading h3{font-size:14px}.load-state{inset:220px 20px 210px}.part-total{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;transition:none!important}}

/* Readable labels at compact sizes. */
.view-button,.playback label,.reset-button,.parts-list summary,.part-button,.parts-heading h3{font-size:14px}.detail p{font-size:14px}.eyebrow,.part-total,.part-en,.detail-meta,.parts-heading>span,.group-count,.part-id,.sidebar-note p,.range-row,.interaction-hint,.viewer-foot,.playback>div>span{font-size:12px}.brand-en{font-size:10px}.intro p{font-size:14px}.detail p{margin-top:20px;margin-bottom:22px}.scene-label{font-size:12px}@media(max-height:800px) and (min-width:761px){.intro{top:25px}.intro h1{font-size:29px;margin-top:14px}.intro p{display:none}.scene-label{top:190px}#viewport{inset:120px 0 170px}.view-tools{top:25px}.sidebar{padding-top:26px}.detail{padding-top:23px}.detail p{margin:18px 0}.detail h2{font-size:26px}.interaction-hint{bottom:172px}}

.model-picker{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:12px}.model-picker select{font:inherit;font-size:14px;color:var(--wood);padding:9px 30px 9px 12px;background:#fff;border:1px solid #d3d6cd;border-radius:4px;cursor:pointer}.model-picker select:focus-visible{outline:2px solid #925f42;outline-offset:3px}h1 b{font:inherit}.intro #model-dimensions{display:block;font-size:13px} @media(max-width:1100px){.header-caption{display:none}} @media(max-width:760px){.model-picker{gap:8px}.model-picker select{padding:8px 20px 8px 8px}.intro h1{font-size:27px}.intro #model-dimensions{font-size:12px}}

@media(min-width:761px){.viewer,.sidebar{min-height:680px}#viewport{top:150px;bottom:155px}.interaction-hint{bottom:165px}}

/* Mobile model, controls and selected-part introduction share one screen. */
.mobile-only,.mobile-detail{display:none}
#parts-dialog{border:1px solid var(--line);padding:0;color:var(--ink);background:#fafaf7;width:min(100%,520px);max-width:100%;max-height:72dvh;margin:auto auto 0;border-radius:16px 16px 0 0;overflow:hidden}
#parts-dialog::backdrop{background:rgb(30 28 24 / 35%)}
#parts-dialog[open]{display:flex;flex-direction:column}
.catalog-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px;border-bottom:1px solid var(--line);flex-shrink:0}
.catalog-head h2{font-size:18px;font-weight:500;margin:0;text-wrap:balance}
.catalog-head p{font-size:12px;color:var(--muted);margin:6px 0 0}
.catalog-head button,.mobile-detail-head button{width:44px;height:44px;flex-shrink:0;font-size:26px;border-radius:6px;color:var(--wood)}
#mobile-parts-content{overflow:auto;overscroll-behavior:contain;padding:0 20px calc(16px + env(safe-area-inset-bottom));min-height:0}
#mobile-parts-content .part-button{min-height:44px}
@media(max-width:760px){
 .topbar{height:60px;padding:0 16px}
 .viewer{height:calc(100dvh - 60px);min-height:460px;max-height:none}
 .sidebar{display:none}
 .intro{top:14px;left:16px}
 .intro h1{font-size:23px;margin:10px 0 0;line-height:1.4}
 .intro h1 span{font-size:12px}
 .intro #model-dimensions{display:none}
 .intro .eyebrow{font-size:10px}
 .view-tools{top:90px;right:14px}
 .view-button{min-height:36px;padding:6px 10px;font-size:12px}
 .scene-label{top:104px;left:16px;font-size:11px}
 #viewport{inset:136px 0 calc(var(--dock-height,132px) + 48px + env(safe-area-inset-bottom))}
 .interaction-hint{bottom:calc(var(--dock-height,132px) + 24px + env(safe-area-inset-bottom));font-size:11px}
 .explosion-panel{bottom:calc(12px + env(safe-area-inset-bottom));width:calc(100% - 24px);padding:12px;backdrop-filter:none;background:#fafbf8}
 .playback{gap:8px}
 .play-button{width:40px;height:40px}
 .playback>div{flex:1;min-width:0}
 .playback label{display:none}
 .playback>div>span{font-size:11px;margin:0;line-height:1.5}
 .catalog-button{display:block;min-height:44px;padding:8px;font-size:13px;color:var(--wood);border:1px solid var(--line);border-radius:5px;white-space:nowrap}
 .reset-button{min-height:44px;padding:5px;font-size:12px;gap:3px;margin-left:0}
 .range-row{margin-top:6px;gap:10px;min-height:32px}
 .range-row input{height:24px;background-size:100% 4px;background-repeat:no-repeat;background-position:center}
 .range-row input::-webkit-slider-thumb{width:20px;height:20px}
 .range-row input::-moz-range-thumb{width:16px;height:16px}
 .viewer-foot{display:none}
 .mobile-detail:not([hidden]){display:block;border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:10px}
 .mobile-detail-head{display:flex;justify-content:space-between;gap:8px;align-items:center}
 .mobile-detail-head span{font-size:10px;color:var(--muted)}
 .mobile-detail h2{font-size:17px;font-weight:500;line-height:1.4;margin:3px 0 0;text-wrap:balance}
 .mobile-detail p{font-size:13px;line-height:1.65;color:#62675d;margin:6px 0 0;max-height:66px;overflow:auto;overscroll-behavior:contain;text-wrap:pretty}
 .load-state{inset:145px 16px calc(var(--dock-height,132px) + 30px)}
}
@media(max-width:760px) and (max-height:650px){
 .intro .eyebrow{display:none}.intro{top:8px}.intro h1{margin:0;font-size:21px}
 .view-tools{top:51px}.scene-label{top:66px}#viewport{top:96px}
 .interaction-hint{font-size:10px}.mobile-detail p{max-height:44px}
}
@media(max-width:760px) and (max-height:650px){
 .intro{display:none}.view-tools{top:10px}.scene-label{top:24px}
 #viewport{top:56px;bottom:calc(var(--dock-height,132px) + 26px + env(safe-area-inset-bottom))}
 .interaction-hint{display:none}
 .mobile-detail:not([hidden]){padding-bottom:6px;margin-bottom:6px}
 .mobile-detail p{margin-top:4px}
}