:root{color-scheme:light;--blue:#008dcb;--deep:#0068b7;--ink:#15191c;--muted:#626d73;--ground:#e9ecee;--panel:#f6f7f8;--line:#d3d8dc;--display:'Michroma',system-ui,sans-serif;--body:'Inter Tight','Helvetica Neue',Arial,sans-serif;--header:64px;--footer:60px;--page-width:400px;--page-ratio:595.276/841.89}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{font:14px var(--body);background:var(--ground);color:var(--ink);overflow:hidden}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{touch-action:manipulation}:focus-visible{outline:2px solid var(--blue);outline-offset:3px}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.top{height:var(--header);display:flex;align-items:center;gap:16px;padding:10px 18px;background:var(--panel);border-bottom:1px solid var(--line);position:relative;z-index:20}.brand{display:flex;align-items:center;gap:12px;flex:none}.brand img{object-fit:contain;max-width:82px;height:auto;background:var(--deep);padding:5px;border-radius:2px}.brand span{font:10px var(--display);letter-spacing:.02em}.brand small{display:block;font:12px var(--body);color:var(--muted);margin-top:6px}.search{position:relative;margin-left:auto;width:min(380px,35vw)}.search input{height:38px;width:100%;border:1px solid var(--line);border-radius:3px;background:white;padding:0 12px;color:var(--ink)}.results{position:absolute;top:44px;right:0;z-index:25;width:min(460px,92vw);max-height:65vh;overflow:auto;background:var(--panel);border:1px solid var(--line);box-shadow:0 8px 24px #15191c22}.results button{display:grid;grid-template-columns:54px 1fr;gap:10px;width:100%;text-align:left;padding:10px 12px;border:0;background:none;color:var(--ink);cursor:pointer}.results button:hover{background:var(--ground)}.results .rp{color:var(--deep);font-weight:600}.results .rt{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.results p{padding:8px 12px;color:var(--muted)}.languages{display:flex;border:1px solid var(--line);border-radius:3px;overflow:hidden;flex:none}.languages a{padding:10px;font-weight:600;font-size:12px}.languages a+a{border-left:1px solid var(--line)}.languages a[aria-current]{background:var(--deep);color:white}.back-link{color:var(--deep);font-size:12px;white-space:nowrap}.menu{display:none!important}
.shell{display:grid;grid-template-columns:280px minmax(0,1fr);height:calc(100dvh - var(--header) - var(--footer))}aside{height:100%;display:grid;grid-template-columns:28px 1fr;overflow:auto;background:var(--panel);border-right:1px solid var(--line)}.regtab{background:#dcdfe1;position:sticky;top:0;height:100%;padding-top:18px;display:flex;flex-direction:column;align-items:center;gap:24px}.regtab span{writing-mode:vertical-rl;transform:rotate(180deg);font:10px var(--display);letter-spacing:.05em}.regtab i{height:90px;background:var(--blue);width:100%}#tocLinks{padding:12px 14px 30px}.intro{font-size:12px;color:var(--muted);line-height:1.55;margin:0 0 18px}.chapter{border-top:1px solid var(--line)}.chapter:last-child{border-bottom:1px solid var(--line)}.chapter summary{cursor:pointer;padding:10px 0;font-size:12px;line-height:1.5;color:var(--deep);font-weight:600}.chapter summary small{float:right;color:var(--muted);font-weight:400}.chapter ul{list-style:none;margin:0;padding:0 0 10px}.chapter a{display:flex;justify-content:space-between;gap:10px;padding:5px 7px;font-size:12px;border-radius:2px}.chapter a .pn{color:var(--muted);flex:none}.chapter a.on{color:white;background:var(--blue)}.chapter a.on .pn{color:white}.chapter a:hover{background:#008dcb16}.chapter a.on:hover{background:var(--deep)}
main{position:relative;min-width:0;min-height:0;overflow:auto}.stage{min-height:100%;display:flex;align-items:center;justify-content:center;padding:20px}.spread{position:relative;display:flex;align-items:flex-start;perspective:2200px;box-shadow:0 12px 32px #15191c25}.sheet{flex:none;width:var(--page-width);margin:0;position:relative}.paper{position:relative;width:100%;aspect-ratio:var(--page-ratio);background:white;overflow:hidden}.paper>svg{display:block;width:100%;height:100%;position:absolute;inset:0}.paper text{white-space:pre}.paper .e{font-family:var(--display);font-weight:700}.paper .el{font-family:var(--display);font-weight:400}.paper .h200{font-family:var(--body);font-weight:200}.paper .h300{font-family:var(--body);font-weight:300}.paper .h400{font-family:var(--body);font-weight:400}.paper .h500{font-family:var(--body);font-weight:500}.paper .h700{font-family:var(--body);font-weight:700}.paper text.hit{stroke:#ffe14d;stroke-width:4px;paint-order:stroke;stroke-linejoin:round}.paper .search-mark{fill:#ffe14d;fill-opacity:.55;stroke:#c89600;stroke-width:.5;pointer-events:none}.paper rect.go{fill:transparent;cursor:pointer}.paper rect.go:hover{fill:#008dcb20}.page-caption{position:absolute;right:8px;bottom:6px;background:#36424ca6;color:white;padding:2px 6px;border-radius:3px;font-size:11px;pointer-events:none}.spread.has-pair>.sheet:first-child .paper::after,.spread.has-pair>.sheet:nth-child(2) .paper::after{content:'';position:absolute;top:0;bottom:0;width:25px;pointer-events:none}.spread.has-pair>.sheet:first-child .paper::after{right:0;background:linear-gradient(to right,transparent,#17203325)}.spread.has-pair>.sheet:nth-child(2) .paper::after{left:0;background:linear-gradient(to left,transparent,#17203325)}.status{position:absolute;inset:0;display:flex;justify-content:center;align-items:center;text-align:center;padding:30px;background:var(--ground);line-height:1.6;z-index:10}.status.error{align-items:center;flex-direction:column;gap:14px}.flip-leaf{position:absolute;top:0;width:var(--page-width);height:100%;transform-style:preserve-3d;z-index:5;pointer-events:none}.flip-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden}.flip-back{transform:rotateY(180deg)}.flip-face .paper{height:100%}.sheet--blank .paper{background:transparent}
.toolbar{height:var(--footer);display:flex;align-items:center;justify-content:center;gap:14px;padding:8px 14px;background:var(--panel);border-top:1px solid var(--line);position:relative;z-index:15}.control{display:inline-flex;align-items:center;justify-content:center;min-height:38px;min-width:38px;border:1px solid var(--line);border-radius:3px;background:var(--panel);color:var(--ink);padding:7px 11px;cursor:pointer;font-size:12px}.control:hover{background:#008dcb16}.control:disabled{opacity:.4;cursor:default}.paging{display:flex;align-items:center;gap:8px;white-space:nowrap}.paging>button{font-size:24px;line-height:1}.paging label,.paging span{font-size:12px;color:var(--muted)}#pageNumber{width:66px;min-height:38px;padding:6px;border:1px solid var(--line);border-radius:3px;text-align:center;background:white;color:var(--ink);font-variant-numeric:tabular-nums}.zoom{display:flex}.zoom .control{border-radius:0}.zoom .control+button{border-left:0}.zoom .control:first-child{border-radius:3px 0 0 3px}.zoom .control:last-child{border-radius:0 3px 3px 0}.view-mode[aria-pressed=true]{background:var(--deep);color:white}.download{color:var(--deep)}.no-script{position:absolute;z-index:40;top:90px;left:10%;right:10%;padding:24px;background:white;border:1px solid var(--line)}
.list-mode .stage{display:block;padding:24px 18px}.list-mode .spread{display:grid;justify-content:center;gap:32px;box-shadow:none}.list-mode .sheet{width:var(--list-width);box-shadow:0 3px 16px #15191c20}.list-mode .paper::after{display:none!important}.list-mode .page-caption{position:static;display:block;background:none;color:var(--muted);padding:7px;text-align:left}.list-mode .placeholder{background:linear-gradient(#f1f3f4 0 0) 8% 5%/40% 3% no-repeat,linear-gradient(#f4f5f6 0 0) 8% 20%/84% 60% no-repeat,white}
@media(max-width:1100px){.brand span{display:none}.top{gap:12px}.back-link{font-size:11px}}
@media(max-width:1000px){.shell{grid-template-columns:1fr}.menu{display:inline-flex!important}aside{position:fixed;top:var(--header);bottom:var(--footer);left:0;width:280px;height:auto;z-index:18;transform:translateX(-100%);transition:transform .18s;box-shadow:5px 0 20px #15191c22}body.nav-open aside{transform:translateX(0)}.search{width:auto;flex:1}.brand img{max-width:64px}.stage{padding:14px}}
@media(max-width:650px){:root{--header:58px;--footer:108px}.top{padding:8px;gap:8px}.brand{display:none}.back-link{display:none}.toolbar{flex-wrap:wrap;gap:8px;padding:8px}.paging{flex-basis:100%;justify-content:center}.fullscreen{display:none}.control{padding:7px 10px}.languages a{padding:9px}.stage{padding:12px}.paging label,.paging span{font-size:13px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}