:root{--bg:#f2f1eb;--panel:#f8f7f2;--viewport:#e7e9e1;--ink:#253e37;--muted:#737c70;--line:#d3d6cb;--accent:#426d51;--accent-bg:#e1e7d8;--white:#fff;--bone:#b0a075;--muscle:#a34848;--organ:#c3835a;--brain:#9e7d9e;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px 'DM Sans','Noto Sans SC',system-ui,sans-serif}body.dark{--bg:#151e1c;--panel:#1d2824;--viewport:#23312b;--ink:#e2e6db;--muted:#a1b0a2;--line:#3a4940;--accent:#a7c796;--accent-bg:#334533;--white:#21332a;color-scheme:dark}button,input,select{font:inherit}button,a,input,select{outline-offset:4px}button{cursor:pointer;border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:10px 14px;border-radius:4px;transition:background .2s,border-color .2s}button:hover{border-color:var(--accent);background:var(--accent-bg)}button:disabled{opacity:.4;cursor:default}a{color:var(--accent)}[hidden]{display:none!important}.quiet{background:transparent}.primary{background:var(--ink);color:var(--bg);border-color:var(--ink);min-width:120px}.primary:hover{background:var(--accent);color:var(--bg)}.wide{width:100%;text-align:center}header,main,footer{max-width:1560px;margin:auto}header{height:82px;display:flex;align-items:center;padding:0 40px;border-bottom:1px solid var(--line);gap:28px}.brand{text-decoration:none;letter-spacing:.14em;font-size:13px;font-weight:700;color:var(--ink)}.brand span{font-size:11px;color:var(--muted);font-weight:400;letter-spacing:0}header nav{margin-left:auto;display:flex;gap:26px}header nav a{text-decoration:none;font-size:12px;color:var(--muted);padding:11px 0}header nav a[aria-current]{color:var(--accent);border-bottom:1px solid var(--accent)}#theme{font-size:11px;padding:8px 12px}main{padding:0 40px}.intro{padding:39px 0 32px;display:flex;justify-content:space-between;align-items:flex-end}.eyebrow{font-size:10px;letter-spacing:.13em;color:var(--muted);margin:0 0 14px}h1{font-size:clamp(28px,3.1vw,43px);letter-spacing:-.03em;margin:0 0 14px;font-weight:500}.subtitle{font-size:13px;color:var(--muted);margin:0;line-height:1.8}.intro-note{font-size:11px;color:var(--muted);line-height:1.9;text-align:right;padding-bottom:3px}.mode-bar{display:flex;border-top:1px solid var(--line);gap:3px;padding:12px 0;align-items:center}.mode-bar button{border:0;background:transparent;padding:11px 18px;display:flex;gap:12px;font-size:10px;color:var(--muted)}.mode-bar button span{font-size:13px}.mode-bar button[aria-pressed=true]{background:var(--accent-bg);color:var(--ink)}.mode-hint{margin-left:auto;color:var(--muted);font-size:10px}.atlas{border:1px solid var(--line);border-radius:6px;overflow:hidden;display:grid;grid-template-columns:206px minmax(0,1fr) 245px;grid-template-rows:minmax(690px,72vh) auto;background:var(--panel)}.left-panel{border-right:1px solid var(--line);padding:22px 18px;overflow:auto}.panel-heading{display:flex;justify-content:space-between;align-items:center;font-size:12px;margin-bottom:23px}.panel-heading small{font-size:9px;letter-spacing:.06em;color:var(--muted)}.layer{padding:12px 0;border-bottom:1px solid var(--line)}.layer-title{display:flex;align-items:center;gap:9px;font-size:12px;cursor:pointer}.layer-title input{accent-color:var(--accent);width:14px;height:14px;margin:0}.dot{display:inline-block;width:7px;height:7px;border-radius:50%;flex-shrink:0}.layer-title small{margin-left:auto;color:var(--muted);font-size:9px}.opacity{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:9px;margin:10px 0 0 23px}.opacity input{width:100%;height:3px;accent-color:var(--accent)}.panel-divider{border-top:1px solid var(--line);margin:25px 0 22px}.small-heading{display:block;font-size:11px;margin:0 0 10px}#search{width:100%;border:1px solid var(--line);background:var(--bg);border-radius:4px;padding:10px 8px;color:var(--ink);font-size:11px}.hint,.reference-note{font-size:10px;color:var(--muted);line-height:1.8}.reference-note{margin-top:30px;padding-top:15px;border-top:1px solid var(--line)}#results{max-height:210px;overflow:auto;margin-top:8px}.result{width:100%;font-size:10px;text-align:left;margin:3px 0;padding:8px;line-height:1.5;word-break:break-word}.result small{display:block;color:var(--muted);font-size:9px}#brain-regions button{width:100%;text-align:left;border:0;font-size:11px;padding:7px 0;background:transparent;display:flex;align-items:center;gap:10px}#brain-inside{font-size:10px;margin-top:10px}.viewport{position:relative;background:var(--viewport);min-width:0;overflow:hidden;isolation:isolate}.viewport:before{content:'';position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:60px 60px;opacity:.19;z-index:-1}.viewport-heading{position:absolute;top:21px;left:22px;right:22px;display:flex;justify-content:space-between;color:var(--muted);font-size:10px;gap:12px;pointer-events:none;z-index:2}#model-stat{text-align:right;font-size:9px}#canvas-host{width:100%;height:100%;touch-action:none}canvas{display:block;width:100%;height:100%;outline:0}#loading{position:absolute;inset:0;background:var(--viewport);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:15px;z-index:5;padding:30px;text-align:center}.loading-mark{font:32px Georgia,serif;color:var(--accent);letter-spacing:.12em;margin-bottom:15px}#loading strong{font-size:14px;font-weight:500}#loading-detail{font-size:11px;color:var(--muted);line-height:1.8}progress{width:180px;height:3px;accent-color:var(--accent)}.orientation{position:absolute;top:53%;left:18px;right:18px;display:flex;justify-content:space-between;font-size:9px;color:var(--muted);pointer-events:none}.view-controls{position:absolute;bottom:18px;left:0;right:0;display:flex;justify-content:center;gap:4px;flex-wrap:wrap;padding:0 8px}.view-controls button{font-size:10px;padding:7px 9px;background:var(--panel)}#picked-label{position:absolute;top:57px;left:20px;max-width:calc(100% - 40px);padding:8px 12px;background:var(--panel);border:1px solid var(--line);font-size:10px;pointer-events:none;line-height:1.7}.detail-panel{padding:22px;border-left:1px solid var(--line);overflow:auto}.selection-index{font-size:9px;letter-spacing:.1em;color:var(--accent);margin:35px 0 15px}.detail-panel h2{font-weight:500;font-size:22px;line-height:1.5;margin:0 0 9px;overflow-wrap:anywhere}.english{font-size:10px;color:var(--muted);line-height:1.7;overflow-wrap:anywhere;margin:0 0 21px}#part-swatch{height:3px;width:35px;background:var(--accent);margin-bottom:24px}#part-description{font-size:12px;line-height:2;min-height:92px}dl{margin:22px 0;font-size:10px}dl div{display:flex;border-top:1px solid var(--line);padding:11px 0;gap:12px}dt{color:var(--muted);flex-shrink:0}dd{margin-left:auto;text-align:right;line-height:1.6}.detail-actions{display:flex;flex-direction:column;gap:7px}.detail-actions button{font-size:11px}.detail-footnote{font-size:9px;line-height:1.9;color:var(--muted);margin-top:25px}.transport{grid-column:1/-1;border-top:1px solid var(--line);padding:20px 26px;background:var(--panel)}.transport-top{display:flex;justify-content:space-between;align-items:center;gap:12px}.transport .eyebrow{font-size:8px;margin:0 0 7px}.transport h3{font-size:15px;font-weight:500;margin:0}.transport-actions{display:flex;gap:9px;align-items:center}.transport-actions button{font-size:11px}.speed-label{font-size:10px;color:var(--muted);margin-left:8px;white-space:nowrap}select{border:0;background:transparent;color:var(--ink);padding:8px 0}.explode-line{display:flex;align-items:center;gap:22px;margin:19px 0 10px;font-size:10px;color:var(--muted)}#explode{width:100%;height:3px;accent-color:var(--accent)}.explode-line label{white-space:nowrap}output{min-width:35px;text-align:right}#chapter-description{font-size:10px;color:var(--muted);margin:13px 0 0;line-height:1.8}.reading{padding:46px 0;display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:65px;border-bottom:1px solid var(--line)}.reading h2{font-size:23px;font-weight:500;line-height:1.7;margin:0 0 12px}.reading h3{font-size:15px;font-weight:500;margin:15px 0}.reading p{font-size:11px;line-height:2;color:var(--muted);margin:0}.reading article span{font-size:10px;color:var(--accent)}.sources{padding:22px 0;color:var(--muted);font-size:10px;line-height:2}.sources summary{cursor:pointer}.sources div{max-width:1000px;padding:10px 0}.sources code{color:var(--ink)}footer{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:24px 40px;font-size:9px;letter-spacing:.04em;color:var(--muted)}#tissue-stage{position:absolute;inset:0;background:var(--viewport);padding:60px 35px 20px;overflow:auto}.tissue-hero h2{font-size:29px;font-weight:500;line-height:1.5;margin:10px 0}.tissue-hero>p:last-child{font-size:11px;color:var(--muted);max-width:380px;line-height:1.9}#tissue-diagram svg{width:100%;height:260px;display:block}#tissue-tabs{display:flex;gap:5px;flex-wrap:wrap}#tissue-tabs button{font-size:10px;flex:1;min-width:65px;padding:10px 7px}#tissue-tabs button[aria-pressed=true]{background:var(--accent-bg);border-color:var(--accent)}.tissue-label{font:12px system-ui;fill:var(--ink)}.tissue-note{font:10px system-ui;fill:var(--muted)}
@media(min-width:1700px){.atlas{grid-template-rows:820px auto}}@media(max-width:1150px){header{padding:0 24px}main{padding:0 24px}.atlas{grid-template-columns:172px minmax(0,1fr) 204px;grid-template-rows:680px auto}.left-panel{padding:20px 13px}.detail-panel{padding:20px 16px}.intro-note{display:none}.mode-hint{font-size:9px}.detail-panel h2{font-size:19px}.reading{gap:32px}.brand span{display:none}}@media(max-width:820px){header{height:65px;gap:12px;padding:0 18px}header nav{gap:16px}header nav a{font-size:10px}.brand{font-size:11px}#theme{font-size:10px;padding:7px}main{padding:0 16px}.intro{padding:28px 0 22px}.subtitle{font-size:11px;max-width:90%}.mode-bar button{padding:10px 12px;gap:8px}.mode-bar button span{font-size:11px}.mode-hint{display:none}.atlas{grid-template-columns:160px minmax(0,1fr);grid-template-rows:650px auto auto}.detail-panel{grid-row:2;grid-column:1/-1;border-left:0;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;column-gap:22px}.detail-panel .panel-heading{grid-column:1/-1;margin:0 0 14px}.selection-index{margin:5px 0 10px}.detail-panel h2,.english,#part-swatch,#part-description{grid-column:1;min-height:0}#part-swatch{margin-bottom:12px}#part-facts{grid-column:2;grid-row:2/6;margin:0}.detail-actions{grid-column:2;grid-row:6/8}.detail-footnote{grid-column:1/-1;margin:10px 0 0}.transport{grid-row:3}.reading{grid-template-columns:1fr 1fr}.reading>div{grid-column:1/-1}.reading p{font-size:11px}footer{padding:22px 16px;gap:20px}#tissue-stage{padding:55px 20px 20px}.tissue-hero h2{font-size:24px}#tissue-diagram svg{height:240px}}
@media(max-width:520px){header nav{gap:11px}header{gap:9px}.brand{font-size:10px;letter-spacing:.08em}#theme{padding:6px;font-size:9px}.intro h1{font-size:30px}.atlas{grid-template-columns:minmax(0,1fr);grid-template-rows:auto 590px auto auto}.left-panel{grid-row:1;border:0;border-bottom:1px solid var(--line);padding:14px}.left-panel .panel-heading{margin:0 0 12px}.left-panel #layers{display:grid;grid-template-columns:1fr 1fr;gap:9px 14px}.layer{padding:0 0 9px}.layer-title{font-size:11px}.opacity{margin:7px 0 0 23px}.panel-divider{margin:10px 0 12px}.left-panel .small-heading{font-size:10px}.reference-note{display:none}.left-panel #search{padding:9px}.left-panel #search-status{margin:6px 0 0}#results{max-height:140px;display:grid;grid-template-columns:1fr 1fr;gap:3px}#brain-regions{display:grid;grid-template-columns:1fr 1fr}#brain-regions button{padding:6px 0;font-size:10px}.viewport{grid-row:2}.detail-panel{grid-row:3;grid-template-columns:1fr 1fr;padding:18px 14px;column-gap:15px}.transport{grid-row:4;padding:18px 14px}.transport-top{align-items:flex-start}.transport h3{font-size:13px}.transport-actions{gap:5px;flex-wrap:wrap;justify-content:flex-end;max-width:195px}.transport-actions button{padding:9px;font-size:10px;min-width:0}.speed-label{font-size:9px}select{padding:0}.explode-line{gap:10px}.reading{gap:22px;padding:32px 0}.reading h2{font-size:22px}.reading h3{font-size:13px}.reading p{font-size:10px}.detail-panel h2{font-size:18px}footer{font-size:8px}#tissue-stage{padding:55px 23px 20px}.tissue-hero h2{font-size:27px}.tissue-hero{padding-bottom:8px}#tissue-diagram svg{height:220px}.orientation{left:12px;right:12px;font-size:8px}.viewport-heading{left:14px;right:14px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
#presets{display:grid;grid-template-columns:repeat(4,1fr);gap:3px;margin:0 0 12px}#presets button{font-size:9px;padding:6px 0}.opacity{white-space:nowrap}.atlas[data-mode=tissue] .left-panel>.panel-divider,.atlas[data-mode=tissue] .left-panel>label,.atlas[data-mode=tissue] #search,.atlas[data-mode=tissue] #results,.atlas[data-mode=tissue] #search-status,.atlas[data-mode=tissue] .reference-note{display:none}.atlas[data-mode=tissue] .left-panel:after{content:'人体有四类基本组织。一个器官往往同时包含多种组织。\A\A点击图下的按钮，逐一观察细胞与基质的代表性排列。';white-space:pre-line;display:block;font-size:11px;color:var(--muted);line-height:2}.atlas[data-mode=tissue] .orientation{display:none}@media(max-width:520px){.atlas[data-mode=tissue]{grid-template-rows:auto 590px auto}.atlas[data-mode=tissue] .left-panel:after{font-size:10px}.atlas[data-mode=tissue] .left-panel .panel-heading{margin:0 0 8px}.atlas[data-mode=tissue] .left-panel:after{content:'四类组织的代表性排列。点击图下按钮，观察细胞与基质。'}}