:root{--ink:#17273f;--muted:#586a83;--line:#dce4ee;--blue:#234f9d;--paper:#fff;--red:#9d3547;--orange:#885315;--sidebar:248px;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:#f6f8fc;font-size:16px;font-synthesis:weight}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:var(--blue);text-decoration:none}button{cursor:pointer;color:inherit}button:active{transform:scale(.98)}:focus-visible{outline:3px solid #407dd6;outline-offset:4px}button:disabled{opacity:.45;cursor:default}button:disabled:active{transform:none}[hidden]{display:none!important}.skip{position:fixed;left:18px;top:-60px;z-index:20;background:white;padding:12px}.skip:focus{top:10px}.shell{min-height:100dvh}.sidebar{width:var(--sidebar);position:fixed;inset:0 auto 0 0;z-index:5;background:#fff;border-right:1px solid var(--line);padding:25px 17px 16px;display:flex;flex-direction:column;overflow-y:auto}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);font-size:18px;font-weight:700;letter-spacing:.01em;padding:4px 7px 25px}.brand 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var(--line);background:white;border-radius:8px;text-align:left;color:#284c7d;line-height:1.6;font-size:16px;font-weight:600;min-height:60px}.glossary-card small{font-size:12px;color:var(--muted);display:block;font-weight:400;margin-top:8px}.sources-wrap .article table{font-size:15px}.sources-wrap .article p{scroll-margin-top:20px}dialog{padding:28px 32px 0;border:1px solid #d8e1ed;border-radius:16px;color:var(--ink);background:#fff;max-width:min(760px,calc(100vw - 36px));width:760px;max-height:calc(100dvh - 70px);box-shadow:0 30px 100px #0a234240;overflow-y:auto}dialog::backdrop{background:#13263d6e;backdrop-filter:blur(3px)}.dialog-top{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:14px}.eyebrow{font-size:13px;color:#526f99;font-weight:600;letter-spacing:.06em}.close-button{border:1px solid #dbe3ee;background:#f6f8fc;border-radius:7px;padding:8px 12px;font-size:14px;min-height:38px;white-space:nowrap}.close-button span{font-size:21px;margin-left:10px}.dialog-top+h2{font-size:27px;line-height:1.5;margin:0 0 23px;overflow-wrap:anywhere}.term-family{font-size:14px!important;color:#68778c;padding:12px 15px;background:#f3f6fb;border-radius:6px}.concept-source{font-size:13px;color:#647791;line-height:1.8;padding:20px 0;overflow-wrap:anywhere}.dialog-bottom{position:sticky;bottom:0;border-top:1px solid var(--line);background:#fff;padding:18px 0;font-size:14px}.dialog-bottom a{display:inline-block;background:#edf3fc;border:1px solid #dce6f5;padding:9px 14px;border-radius:7px}.dialog-open{overflow:hidden}#image-dialog{width:1100px;max-width:calc(100vw - 32px);padding:20px}#image-dialog .close-button{display:block;margin:0 0 16px auto}#full-image{width:100%;height:auto;display:block}#image-caption{color:#566d8b;line-height:1.8;font-size:15px;margin-bottom:5px}.error-state{padding:80px 35px;text-align:center}.no-script{padding:30px}.nav-scrim{display:none}
@media(hover:hover) and (pointer:fine){.map-node:hover{border-color:var(--group-color);box-shadow:0 5px 18px #16345d14}.main-nav a:hover,.chapter-nav a:hover,.chapter-nav summary:hover{background:#f0f4f9}.concept-chip:hover,.glossary-card:hover{background:#eef4fd;border-color:#9eb9de}.article .term-link:hover{background:#eaf2fc;border-radius:3px}.quiet-button:hover,.map-controls button:hover{background:#edf3fb}}
@media(max-width:1250px){:root{--sidebar:225px}.reading-layout{grid-template-columns:minmax(0,1fr);padding:30px 32px 65px;max-width:960px}.local-toc{position:static;grid-row:1;display:flex;flex-wrap:wrap;gap:6px 18px;max-height:none;margin:0;border:0;padding:0 0 15px;border-bottom:1px solid var(--line)}.local-toc strong{width:100%;margin:0}.local-toc a{margin:0;font-size:13px}.brand{font-size:16px;gap:9px}.brand-mark{width:34px;flex-shrink:0}.topbar{padding:0 28px}}
@media(max-width:820px){:root{--sidebar:0px}.sidebar{width:275px;transform:translateX(-100%);z-index:12}.sidebar.open{transform:none}.nav-scrim{position:fixed;inset:0;z-index:11;background:#14233766;border:0;display:block}.main{margin:0}.topbar{height:65px;padding:0 18px;gap:12px}.menu-toggle{display:block;border:1px solid var(--line);background:#fff;border-radius:6px;padding:8px 11px;font-size:14px}.map-page{height:calc(100dvh - 65px)}.page-heading{padding:23px 20px 16px}.page-heading h1{font-size:23px}.map-meta{display:none}.map-stage{margin:0 12px 12px}.map-instruction{left:10px;bottom:70px;font-size:12px}.map-controls{right:12px;bottom:12px}.reading-layout{padding:25px 20px 55px}.chapter-head h1{font-size:26px}.article{font-size:18px}.glossary-page{padding:25px 20px 50px}.glossary-grid{grid-template-columns:repeat(auto-fill,minmax(155px,1fr))}.glossary-card{font-size:15px;padding:14px}.quiet-button{font-size:12px;padding:8px}.breadcrumb{font-size:13px}.breadcrumb .current-breadcrumb{display:none}dialog{padding:22px 21px 0;max-width:calc(100vw - 20px);max-height:calc(100dvh - 26px);border-radius:12px}.dialog-top+h2{font-size:24px}.map-up{top:12px;left:12px}.article td,.article th{padding:12px}.table-scroll{border-radius:6px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
.map-group{position:absolute;background:white;border:1px solid #d6e1ee;border-left:4px solid var(--group-color);border-radius:11px;box-shadow:0 4px 14px #223e6310;padding:26px 23px 22px;display:flex;flex-direction:column;cursor:default}.map-group-title{font-size:25px;font-weight:650;color:var(--group-color);display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 4px 20px;border-bottom:1px solid #e7edf5;line-height:1.45}.map-group-title span{font-size:16px;font-weight:400;color:#64738b;white-space:nowrap}.chapter-links{overflow-y:auto;overscroll-behavior:contain;touch-action:pan-y;flex:1;min-height:0;margin-top:14px;scrollbar-width:thin;scrollbar-color:#b6c7dd #f2f5fa}.chapter-links a{display:flex;align-items:baseline;gap:10px;font-size:20px;color:#2e4565;line-height:1.8;padding:12px 4px;border-radius:5px}.chapter-links a span{font-size:16px;color:#7f91aa;flex-shrink:0;min-width:23px}.chapter-links a:hover{background:#edf3fb}.chapter-links a:focus-visible{outline-offset:-3px}
@media print{.sidebar,.topbar,.concept-strip,.local-toc,.chapter-pagination{display:none}.main{margin:0}.reading-layout{display:block;padding:0;max-width:none}.article{font-size:12pt}.table-scroll{overflow:visible}.article img{max-height:180mm;object-fit:contain}.article .term-link{color:inherit;text-decoration:none}.map-stage{height:200mm}.map-controls,.map-instruction{display:none}}
/* Chapter mind maps: fixed columns for each hierarchy depth. */
.article .knowledge-structure.mindmap{margin:36px 0 48px;border:1px solid #dce5ee;border-radius:14px;background:white;overflow:hidden;font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:18px;line-height:1.65}
.mindmap-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 26px;border-bottom:1px solid #e4ebf2}
.article .mindmap-heading h3{font-size:22px;line-height:1.5;margin:5px 0 0;color:#213e5d}
.article .structure-kicker{font-size:12px;letter-spacing:.08em;color:#697d92;margin:0}
.mindmap-expand{flex-shrink:0;background:#f0f5fb;color:#2b5484;border:1px solid #d7e2f0;border-radius:7px;padding:9px 14px;font-size:14px;min-height:40px}
.mindmap-stage{height:640px;position:relative;overflow:hidden;touch-action:none;cursor:grab;background:#fafcfe;background-image:radial-gradient(#d5dfeb .8px,transparent .8px);background-size:24px 24px}
.mindmap-stage.dragging{cursor:grabbing}.mindmap-stage:focus-visible{outline-offset:-4px}
.mindmap-world{position:absolute;inset:0 auto auto 0;transform-origin:0 0;user-select:none}
.mindmap-level{position:absolute;top:24px;text-align:center;color:#7a8ba0;font-size:14px;letter-spacing:.08em;padding-bottom:12px;border-bottom:1px solid #d9e3ed}
.mindmap-edges{position:absolute;inset:0;pointer-events:none;overflow:visible}.mindmap-edges path{fill:none;stroke-width:2;opacity:.55}
.mindmap-node{position:absolute;display:flex;align-items:center;justify-content:center;padding:14px 19px;text-align:center;font:600 18px/1.5 "PingFang SC","Microsoft YaHei",sans-serif;color:#28445b;background:#fff;border:1.5px solid color-mix(in srgb,var(--branch),white 63%);border-radius:10px;box-shadow:0 2px 6px #1c426008;overflow-wrap:anywhere}
button.mindmap-node{cursor:pointer}button.mindmap-node:hover{border-color:var(--branch);background:color-mix(in srgb,var(--branch),white 94%)}button.mindmap-node:active{transform:none}
.mindmap-node[data-depth="1"]{background:color-mix(in srgb,var(--branch),white 91%);border-color:color-mix(in srgb,var(--branch),white 40%);color:var(--branch);font-weight:700}
.mindmap-node.mindmap-root{background:#244f83;color:#fff;border-color:#244f83;font-weight:700;font-size:21px;box-shadow:0 6px 18px #244f8318}
.mindmap-controls{position:absolute;right:16px;bottom:16px;display:flex;align-items:center;border:1px solid #dbe4ee;border-radius:9px;overflow:hidden;box-shadow:0 3px 12px #17375d0c;background:#fff;z-index:2;cursor:default}
.mindmap-controls button{border:0;background:#fff;min-width:40px;height:42px;font-size:20px}.mindmap-controls button[data-map-action="fit"],.mindmap-controls button[data-map-action="read"]{font-size:13px;padding:0 11px;border-left:1px solid #e3e9f1}.mindmap-controls button:hover{background:#eff4fa}.mindmap-controls output{width:48px;font:12px/1 system-ui;color:#63768c;text-align:center}
.article .mindmap-hint{font-size:13px;color:#63778e;margin:0;padding:14px 24px;line-height:1.8;border-top:1px solid #e4ebf2}
.mindmap-dialog.article{width:calc(100vw - 40px);max-width:none;height:calc(100dvh - 40px);max-height:none;margin:auto;padding:0;border-radius:14px;overflow:hidden}
.mindmap-dialog.article .knowledge-structure.mindmap{height:100%;margin:0;border:0;display:flex;flex-direction:column}
.mindmap-dialog .mindmap-stage{flex:1;min-height:0;height:auto}.mindmap-dialog .mindmap-heading,.mindmap-dialog .mindmap-hint{flex-shrink:0}
.article h4{font-size:20px;line-height:1.6;margin:30px 0 14px;color:#254c67;scroll-margin-top:90px}
@media(max-width:650px){.mindmap-heading{padding:20px 16px;align-items:flex-start;flex-wrap:wrap;gap:14px}.article .mindmap-heading h3{font-size:20px}.mindmap-stage{height:560px}.article .mindmap-hint{padding:13px 16px}.mindmap-controls{right:10px;bottom:10px}.mindmap-dialog.article{width:calc(100vw - 16px);height:calc(100dvh - 16px)}.mindmap-dialog .mindmap-heading{padding:16px}}
@media print{.mindmap-expand,.mindmap-controls,.mindmap-hint{display:none}.mindmap-stage{height:180mm}.mindmap{break-inside:avoid}}
/* Search navigation uses only anchored passages from the chapter body. */
.search-launch{border:1px solid #d4dfed;border-radius:7px;background:#f2f6fc;color:#295389;padding:9px 14px;white-space:nowrap;font-size:14px}
#knowledge-search{padding-bottom:24px;width:740px}#knowledge-search-title{font-size:23px;margin:0;line-height:1.5}.search-label{display:block;font-size:13px;color:#62758e;margin-bottom:9px}
#knowledge-query{display:block;width:100%;border:1px solid #b9cce4;border-radius:8px;padding:13px 15px;font-size:17px;color:#1e3758;background:#fff;min-height:49px}
#knowledge-status{font-size:13px;color:#667a92;line-height:1.7;margin:14px 0}#knowledge-results{display:grid;gap:9px;max-height:52dvh;overflow-y:auto;padding:3px}
#knowledge-results button{display:block;text-align:left;width:100%;padding:15px 17px;border:1px solid #dfe7f1;border-radius:8px;background:#fff;color:#203d62;line-height:1.6}
#knowledge-results strong{font-size:17px;display:block;font-weight:650}#knowledge-results small{display:block;font-size:12px;color:#627994;margin:5px 0}#knowledge-results span{display:block;font-size:14px;color:#52677f;overflow-wrap:anywhere}
#knowledge-results button:hover,#knowledge-results button[aria-selected="true"]{background:#eff5ff;border-color:#8bacd8}.knowledge-target{scroll-margin-top:28px}.knowledge-located{background:#fff4d5!important;outline:2px solid #d7a953!important;outline-offset:6px;border-radius:3px}
.article a.mindmap-node{text-decoration:none;color:#28445b;cursor:pointer}.article a.mindmap-node[data-depth="1"]{color:var(--branch)}.article a.mindmap-root{color:#fff}.article a.mindmap-node:hover{border-color:var(--branch);box-shadow:0 3px 12px #25466a18}.article a.mindmap-node:active{transform:none}
@media(max-width:650px){.topbar{padding:0 12px;gap:8px}.topbar .breadcrumb{font-size:12px}.search-launch{font-size:13px;padding:9px 10px}.topbar .quiet-button{padding:8px;font-size:12px}#knowledge-search{padding:20px 16px}#knowledge-results button{padding:13px}#knowledge-query{font-size:16px}}
@media(max-width:460px){.topbar:has(#back-map:not([hidden])) .breadcrumb{display:none}.topbar .search-launch{margin-left:auto}}
.topbar{position:sticky;top:0;z-index:6}.knowledge-target{scroll-margin-top:100px}
@media(max-width:820px){.knowledge-target{scroll-margin-top:90px}}
/* Independent parasitology volume: restrained color and generous reading space. */
:root{--blue:#286d72;--blue-dark:#175158;--ink:#20353f}
body{background:#f5f7f7;color:#253841;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
.brand-mark{background:#286d72}.brand{line-height:1.5}
.page-heading{padding-bottom:14px}.page-heading h1{font-size:clamp(26px,3vw,40px);line-height:1.35;letter-spacing:-.04em}.page-heading p{font-size:16px;max-width:650px;line-height:1.8}
.study-meta{display:flex;gap:20px;color:#5d7378;font-size:13px;margin:0 0 22px}
.branch-tabs{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 16px}
.branch-tabs button{padding:10px 16px;border:1px solid #d7e1e2;border-radius:8px;color:#456168;background:#fff;font:inherit;font-size:14px;cursor:pointer}
.branch-tabs button.selected{background:#245f65;color:#fff;border-color:#245f65}
.study-path{margin-top:24px;padding:24px 28px;border-top:1px solid #dbe4e5;color:#5a6e75;line-height:1.8}.study-path strong{color:#244b53}.study-path a{margin-right:24px;color:#245f65}
#home-diagram .mindmap-stage{height:660px;min-height:500px}#home-diagram .mindmap-heading h3{font-size:20px}
.mindmap-node{font-weight:600;font-size:18px}.mindmap-node span{line-height:1.5}.mindmap-level{font-size:13px}
.chapter-head h1{font-size:clamp(28px,3vw,38px);line-height:1.4}.chapter-source{line-height:1.8}
.article{font-size:17px;line-height:1.95;letter-spacing:.01em}.article p{margin:18px 0}.article h3{font-size:23px;margin-top:54px;padding-top:20px;color:#244d58}.article h4{font-size:19px}
.article strong{color:#9a3e48;font-weight:700}.article p>strong:first-child{color:#2b6272}.article td strong{color:#a04145}
.article table{font-size:16px;line-height:1.8;min-width:560px}.article td,.article th{padding:15px 18px;vertical-align:top}.article blockquote{font-size:15px;line-height:1.85;border-left:3px solid #bd935f;padding:14px 20px;background:#faf5ed;color:#775b3c}.article blockquote p{margin:0}.article blockquote strong{color:#76532d}
.source-actions{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 24px}.source-pill{font-size:13px;color:#376a73;background:#edf5f4;border:1px solid #d4e6e3;padding:6px 12px;border-radius:6px;text-decoration:none}
.figure-caption{display:block;font-size:13px;text-align:center;color:#637981;margin:-8px 0 26px;line-height:1.6}.article .image-trigger{margin:20px auto;max-width:800px}.article img{max-height:520px;object-fit:contain}
.article details.answer{margin:20px 0;padding:18px 22px;border:1px solid #d7e4e1;border-radius:10px;background:#f6faf8}.answer summary{font-weight:650;cursor:pointer;color:#28665e;line-height:1.7}.answer[open] summary{margin-bottom:20px}
.source-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.source-card{display:flex;flex-direction:column;padding:22px;border:1px solid #dce5e5;border-radius:10px;text-decoration:none;background:white;gap:10px;line-height:1.6}.source-card span,.source-card small{font-size:13px;color:#677e83}.source-card strong{color:#285a64}
.local-toc a{line-height:1.65;padding-top:8px;padding-bottom:8px}button:active{transform:scale(.98)}:focus-visible{outline:3px solid #40948e;outline-offset:3px}
@media(max-width:760px){.article{font-size:17px}.page-heading h1{font-size:27px}.study-meta{gap:12px;flex-wrap:wrap}.branch-tabs{gap:6px}.branch-tabs button{font-size:13px;padding:9px 11px}#home-diagram .mindmap-stage{height:560px}.study-path{padding:20px 0}.source-grid{grid-template-columns:1fr}.chapter-head h1{font-size:28px}.article h3{font-size:22px}.article table{font-size:15px}.source-actions{margin-bottom:16px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.sidebar,.topbar,.mindmap,.local-toc,.chapter-pagination,.branch-tabs{display:none!important}.main{margin:0!important}.reading-layout{display:block!important}.article{font-size:11pt}.article table{min-width:0}.answer:not([open]){display:none}}
.map-page{height:auto;min-height:calc(100dvh - 73px);padding:0 30px 30px}.map-page .page-heading{padding:28px 0 18px}.map-page .mindmap{border:1px solid #dce5e5;border-radius:12px;background:white;overflow:hidden}.map-page .mindmap-heading{padding:20px 24px}.map-page .mindmap-heading h3{margin:8px 0 0}.diagram-choices{display:flex;flex-wrap:wrap;gap:7px;margin:6px 0 14px}.diagram-choices button{border:1px solid #d8e3e3;background:white;color:#567077;border-radius:7px;padding:8px 12px;font-size:13px;line-height:1.5}.diagram-choices button.selected{background:#edf5f2;color:#245e58;border-color:#99b9b2}
.mindmap-stage{height:550px}#home-diagram .mindmap-stage{height:610px}.mindmap-controls{z-index:2}.article .mindmap-heading h3{padding-top:0;margin:6px 0 0}.structure-kicker{margin:0!important}.mindmap-heading{min-height:105px}.figure-caption{font-family:inherit}
@media(max-width:760px){.map-page{padding:0 16px 24px}.map-page .page-heading{padding:24px 0 14px}.diagram-choices{gap:6px}.diagram-choices button{padding:7px 9px}.mindmap-stage{height:480px}#home-diagram .mindmap-stage{height:500px}.study-path a{display:inline-block}}