.hbm-reader[data-reader-edition=all-about-l]{--paper:#fff;--canvas:#f3f4f0;--ink:#222b2a;--muted:#596663;--line:#d9dfda;--accent:#19685f;--accent-deep:#125148;--wash:#eef6f2;--ui:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;--serif:Georgia,"Times New Roman",serif;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}.hbm-reader[data-reader-edition=all-about-l] *{box-sizing:border-box}.hbm-reader[data-reader-edition=all-about-l]{scroll-behavior:auto;background:var(--canvas);color:var(--ink);font-family:var(--ui);margin:0;font-size:15px;line-height:1.5}.hbm-reader[data-reader-edition=all-about-l] button,.hbm-reader[data-reader-edition=all-about-l] a{-webkit-tap-highlight-color:transparent}.hbm-reader[data-reader-edition=all-about-l] button{font:inherit;color:inherit;cursor:pointer}.hbm-reader[data-reader-edition=all-about-l] a{color:var(--accent)}.hbm-reader[data-reader-edition=all-about-l] button:focus-visible,.hbm-reader[data-reader-edition=all-about-l] a:focus-visible,.hbm-reader[data-reader-edition=all-about-l] [tabindex]:focus-visible{outline-offset:4px;border-radius:3px;outline:3px solid #277f73}.hbm-reader[data-reader-edition=all-about-l] .skip-link{z-index:10;background:#fff;padding:10px;position:fixed;top:-90px;left:10px}.hbm-reader[data-reader-edition=all-about-l] .skip-link:focus{top:10px}.hbm-reader[data-reader-edition=all-about-l] .reader-header{justify-content:space-between;align-items:center;gap:20px;max-width:1140px;margin:0 auto;padding:26px 28px 21px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .reader-brand{color:var(--ink);letter-spacing:.13em;align-items:center;gap:13px;font-size:11px;font-weight:720;text-decoration:none;display:flex}.hbm-reader[data-reader-edition=all-about-l] .brand-glyph{font:italic 37px var(--serif);color:var(--accent);border:1px solid #a8c7bd;border-radius:50%;place-items:center;width:46px;height:46px;padding-bottom:4px;line-height:1;display:grid}.hbm-reader[data-reader-edition=all-about-l] .brand-sub{letter-spacing:0;color:var(--muted);margin-top:3px;font-size:12px;font-weight:420;display:block}.hbm-reader[data-reader-edition=all-about-l] .reader-tools{align-items:center;gap:9px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .tool-button{background:0 0;border:1px solid #0000;border-radius:7px;align-items:center;gap:8px;min-height:42px;padding:9px 12px;font-size:13px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .tool-button:hover{border-color:var(--line);background:#fff}.hbm-reader[data-reader-edition=all-about-l] .tool-button svg{fill:none;stroke:currentColor;stroke-width:1.4px;width:18px;height:18px}.hbm-reader[data-reader-edition=all-about-l] .pdf-button{border-color:var(--line);background:#fff}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction{border-top:1px solid var(--line);border-bottom:1px solid var(--line);max-width:1004px;color:var(--muted);align-items:center;gap:12px;margin:0 auto 20px;padding:13px 17px;font-size:13px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction p{flex:1;margin:0}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction strong{color:var(--ink);font-weight:550}.hbm-reader[data-reader-edition=all-about-l] .instruction-dot{background:var(--accent);border-radius:50%;flex:none;width:7px;height:7px}.hbm-reader[data-reader-edition=all-about-l] .cue-toggle{color:var(--accent);white-space:nowrap;text-underline-offset:3px;background:0 0;border:0;padding:6px;font-size:11px;text-decoration:underline}.hbm-reader[data-reader-edition=all-about-l] .paper-shell{outline:none;max-width:1004px;margin:0 auto;padding:0}.hbm-reader[data-reader-edition=all-about-l] .paper{background:var(--paper);border:1px solid var(--line);font-family:var(--serif);border-radius:3px;padding:43px 60px 38px;font-size:17px;line-height:1.67;box-shadow:0 2px 4px #19272206,0 10px 50px #28342d06}.hbm-reader[data-reader-edition=all-about-l] .paper-eyebrow{font:10px var(--ui);letter-spacing:.11em;color:#65766f;justify-content:space-between;align-items:center;margin-bottom:18px;font-weight:600;display:flex}.hbm-reader[data-reader-edition=all-about-l] .paper h1{letter-spacing:-.025em;color:#192721;max-width:750px;margin:0 0 23px;font-size:31px;font-weight:600;line-height:1.22}.hbm-reader[data-reader-edition=all-about-l] .paper h2{letter-spacing:-.01em;margin:28px 0 11px;font-size:19px;font-weight:650;line-height:1.4}.hbm-reader[data-reader-edition=all-about-l] .paper .lead{border-bottom:1px solid #e5e9e6;margin-bottom:24px;padding-bottom:15px;font-size:18px;line-height:1.65}.hbm-reader[data-reader-edition=all-about-l] .concept-link{appearance:none;color:var(--accent-deep);font:inherit;line-height:inherit;text-align:inherit;vertical-align:baseline;background:0 0;border:0;border-bottom:1px dotted #6a9b90;border-radius:0;padding:0;transition:background .12s;display:inline}.hbm-reader[data-reader-edition=all-about-l] .concept-link:hover{background:#e5f2ed;border-bottom-style:solid}.hbm-reader[data-reader-edition=all-about-l] .concept-link.active-concept{border-bottom:2px solid var(--accent);background:#e7f1ec}.hbm-reader[data-reader-edition=all-about-l].no-link-cues .paper .concept-link{color:inherit;border-bottom-color:#0000}.hbm-reader[data-reader-edition=all-about-l].no-link-cues .paper .concept-link:hover{background:var(--wash);border-bottom-color:var(--accent)}.hbm-reader[data-reader-edition=all-about-l] .equation-block{align-items:center;gap:10px;min-width:0;margin:17px 0 19px;padding:12px 0;display:flex;position:relative}.hbm-reader[data-reader-edition=all-about-l] .equation-scroll{scrollbar-width:thin;scrollbar-color:#bad0c7 transparent;flex:1;min-width:0;padding:3px 5px 6px;overflow:auto hidden}.hbm-reader[data-reader-edition=all-about-l] .equation-scroll:focus-visible{outline-offset:0}.hbm-reader[data-reader-edition=all-about-l] .equation-help{min-width:40px;font:15px var(--serif);color:#52645b;background:0 0;border:1px solid #0000;border-radius:7px;flex:none;align-self:center;min-height:44px;padding:7px 4px}.hbm-reader[data-reader-edition=all-about-l] .equation-help:hover{background:var(--wash);color:var(--accent-deep);border-color:#b7d0c6}.hbm-reader[data-reader-edition=all-about-l] .equation-help-label{font:9px var(--ui);letter-spacing:.02em;color:var(--muted);margin-top:3px;display:block}.hbm-reader[data-reader-edition=all-about-l] .inline-math{white-space:nowrap}.hbm-reader[data-reader-edition=all-about-l] mjx-container{text-indent:0;font-size:99%;line-height:normal}.hbm-reader[data-reader-edition=all-about-l] mjx-container[display=true]{text-align:center;display:block;margin:0!important}.hbm-reader[data-reader-edition=all-about-l] mjx-container:not([display=true]){max-width:none;display:inline-block}.hbm-reader[data-reader-edition=all-about-l] mjx-container svg{max-width:none;overflow:visible}.hbm-reader[data-reader-edition=all-about-l] mjx-container a{color:inherit;text-decoration:none}.hbm-reader[data-reader-edition=all-about-l] mjx-container a:hover,.hbm-reader[data-reader-edition=all-about-l] mjx-container a:focus{color:var(--accent);outline:none}.hbm-reader[data-reader-edition=all-about-l] mjx-container a:hover rect[data-hitbox],.hbm-reader[data-reader-edition=all-about-l] mjx-container a:focus rect[data-hitbox]{fill:#bce6d3;fill-opacity:.55;stroke:#19685f;stroke-width:13px}.hbm-reader[data-reader-edition=all-about-l] .paper-note{font-size:13.2px;line-height:1.65}.hbm-reader[data-reader-edition=all-about-l] .paper #curvature-note{border-top:1px solid var(--line);margin-top:25px;padding-top:18px}.hbm-reader[data-reader-edition=all-about-l] .paper-references{font-family:var(--ui);color:var(--muted);border-top:1px solid #e3e9e4;margin-top:17px;padding-top:10px;font-size:10.6px}.hbm-reader[data-reader-edition=all-about-l] .paper-references p{margin:4px 0}.hbm-reader[data-reader-edition=all-about-l] .reader-footer{max-width:1004px;color:var(--muted);justify-content:space-between;align-items:baseline;gap:20px;margin:22px auto 40px;padding:0 4px;font-size:11px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .reader-footer span{white-space:nowrap;font-weight:600}.hbm-reader[data-reader-edition=all-about-l] .reader-footer p{text-align:right;margin:0}.hbm-reader[data-reader-edition=all-about-l] .noscript-note{background:var(--wash);margin:25px;padding:15px}.hbm-reader[data-reader-edition=all-about-l] #concept-dialog{width:484px;max-width:calc(100vw - 32px);height:auto;max-height:min(720px,100dvh - 32px);color:var(--ink);font:15px/1.58 var(--ui);background:#fff;border:1px solid #cedbd4;border-radius:15px;margin:0;padding:0;position:fixed;inset:auto;overflow:hidden;box-shadow:0 22px 90px #122c2440}.hbm-reader[data-reader-edition=all-about-l] #concept-dialog[open]{flex-direction:column;display:flex}.hbm-reader[data-reader-edition=all-about-l] #concept-dialog::backdrop{-webkit-backdrop-filter:blur(.6px);backdrop-filter:blur(.6px);background:#122c241c}.hbm-reader[data-reader-edition=all-about-l] .dialog-topbar{background:#fbfcfa;border-bottom:1px solid #e4ebe6;flex:none;align-items:center;gap:7px;min-height:53px;padding:9px 11px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .icon-button{color:#466259;background:0 0;border:0;border-radius:7px;place-items:center;min-width:35px;min-height:35px;display:grid}.hbm-reader[data-reader-edition=all-about-l] .icon-button:hover{background:#e7eee8}.hbm-reader[data-reader-edition=all-about-l] .icon-button:disabled{opacity:.27;cursor:default}.hbm-reader[data-reader-edition=all-about-l] .icon-button svg{fill:none;stroke:currentColor;stroke-width:1.7px;stroke-linecap:round;stroke-linejoin:round;width:19px;height:19px}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail{white-space:nowrap;color:#64756e;flex:1;align-items:center;gap:6px;min-width:0;font-size:11px;display:flex;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l] .trail-root{text-overflow:ellipsis;max-width:190px;font:inherit;color:#315d50;text-align:left;background:0 0;border:0;padding:2px 0;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l] .trail-current{text-overflow:ellipsis;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l] .dialog-scroll{overscroll-behavior:contain;scrollbar-width:thin;min-height:0;padding:21px 25px 23px;overflow:auto}.hbm-reader[data-reader-edition=all-about-l] .dialog-kicker{text-transform:uppercase;letter-spacing:.11em;color:var(--accent);margin-bottom:5px;font-size:10px;font-weight:650}.hbm-reader[data-reader-edition=all-about-l] #dialog-title{font-family:var(--serif);letter-spacing:-.025em;outline:none;margin:0 0 14px;scroll-margin-top:15px;font-size:27px;font-weight:500;line-height:1.15}.hbm-reader[data-reader-edition=all-about-l] .entry-formula{scrollbar-width:thin;background:#f4f7f2;border:1px solid #e0e8df;border-radius:7px;max-width:100%;margin:10px 0 17px;padding:14px 12px;font-size:16px;overflow-x:auto}.hbm-reader[data-reader-edition=all-about-l] .entry-summary{font-size:15px;line-height:1.66}.hbm-reader[data-reader-edition=all-about-l] .entry-role{font-size:14px;line-height:1.62}.hbm-reader[data-reader-edition=all-about-l] .entry-section-label{letter-spacing:.09em;text-transform:uppercase;color:#5b7166;margin:17px 0 5px;font-size:10px;font-weight:650;display:block}.hbm-reader[data-reader-edition=all-about-l] .entry-scope{color:#43594e;border-left:2px solid #a1c3b4;margin:17px 0;padding-left:12px;font-size:13px;line-height:1.6}.hbm-reader[data-reader-edition=all-about-l] .entry-scope .entry-section-label{margin:0 0 4px}.hbm-reader[data-reader-edition=all-about-l] .entry-related{flex-wrap:wrap;gap:7px;margin-top:17px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .related-link{color:#1a5c4a;background:#f5f9f5;border:1px solid #cadcd2;border-radius:6px;min-height:34px;padding:6px 10px;font-size:12px;line-height:1.4}.hbm-reader[data-reader-edition=all-about-l] .related-link:hover{background:#e9f3eb;border-color:#83afa0}.hbm-reader[data-reader-edition=all-about-l] .origin-details{color:#50675b;border-top:1px solid #e3e8e2;margin-top:19px;padding-top:11px;font-size:12px}.hbm-reader[data-reader-edition=all-about-l] .origin-details summary{cursor:pointer;color:#386551;margin-left:13px;padding:3px 0;font-size:12px;list-style-position:outside}.hbm-reader[data-reader-edition=all-about-l] .origin-details p{margin:9px 0}.hbm-reader[data-reader-edition=all-about-l] .source-citation{margin:8px 0;display:block}.hbm-reader[data-reader-edition=all-about-l] .source-button{text-align:left;color:var(--accent);text-underline-offset:3px;background:0 0;border:0;padding:0;font-size:12px;text-decoration:underline}.hbm-reader[data-reader-edition=all-about-l] .source-locator{color:#6d7b73;margin-top:2px;font-size:11px;display:block}.hbm-reader[data-reader-edition=all-about-l] .entry-units{color:#738078;margin-top:-8px;margin-bottom:13px;font-size:11px}.hbm-reader[data-reader-edition=all-about-l] .dialog-bottom{color:#61756a;background:#fbfcfa;border-top:1px solid #e3ebe4;flex:none;justify-content:space-between;gap:10px;padding:9px 15px;font-size:10px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .dialog-bottom span:first-child{font-weight:600}.hbm-reader[data-reader-edition=all-about-l] .index-search{width:100%;font:15px var(--ui);background:#fff;border:1px solid #bbcec3;border-radius:7px;min-height:44px;padding:10px 12px}.hbm-reader[data-reader-edition=all-about-l] .index-count{color:#667d70;margin:10px 0;font-size:11px}.hbm-reader[data-reader-edition=all-about-l] .index-list{margin:0;padding:0;list-style:none}.hbm-reader[data-reader-edition=all-about-l] .index-list li{border-bottom:1px solid #eef2ed}.hbm-reader[data-reader-edition=all-about-l] .index-result{text-align:left;color:#254d3b;background:0 0;border:0;justify-content:space-between;align-items:baseline;gap:10px;width:100%;padding:11px 4px;font-size:14px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .index-result:hover{background:#f3f8f2}.hbm-reader[data-reader-edition=all-about-l] .index-result small{white-space:nowrap;color:#6b7e70;text-transform:uppercase;letter-spacing:.04em;font-size:9px}.hbm-reader[data-reader-edition=all-about-l] .index-hint{color:var(--muted);margin:0 0 14px;font-size:13px}.hbm-reader[data-reader-edition=all-about-l] .sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l].dialog-open{overflow:hidden}@media (width>=1200px){.hbm-reader[data-reader-edition=all-about-l] .paper{font-size:17.5px}.hbm-reader[data-reader-edition=all-about-l] .paper h1{font-size:34px}.hbm-reader[data-reader-edition=all-about-l] .paper h2{font-size:20px}.hbm-reader[data-reader-edition=all-about-l] .paper .lead{font-size:18.5px}}@media (width<=1050px){.hbm-reader[data-reader-edition=all-about-l] .reading-instruction{margin-left:20px;margin-right:20px}.hbm-reader[data-reader-edition=all-about-l] .paper-shell{margin:0 20px}.hbm-reader[data-reader-edition=all-about-l] .paper{padding:35px 40px}.hbm-reader[data-reader-edition=all-about-l] .reader-footer{margin-left:23px;margin-right:23px}}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .reader-header{gap:8px;padding:16px 16px 12px}.hbm-reader[data-reader-edition=all-about-l] .reader-brand{letter-spacing:.08em;gap:9px;font-size:9px}.hbm-reader[data-reader-edition=all-about-l] .brand-glyph{width:33px;height:33px;font-size:29px}.hbm-reader[data-reader-edition=all-about-l] .brand-sub{font-size:10px}.hbm-reader[data-reader-edition=all-about-l] .reader-tools{gap:0}.hbm-reader[data-reader-edition=all-about-l] .tool-button{padding:8px;font-size:11px}.hbm-reader[data-reader-edition=all-about-l] .tool-button svg{width:16px;height:16px}.hbm-reader[data-reader-edition=all-about-l] .tool-button span{display:none}.hbm-reader[data-reader-edition=all-about-l] .pdf-button{background:0 0;border:0}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction{gap:8px;margin:0 15px 12px;padding:10px 0;font-size:11px}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction p{max-width:87%}.hbm-reader[data-reader-edition=all-about-l] .cue-toggle{white-space:normal;width:47px;padding:3px;font-size:9px;line-height:1.3}.hbm-reader[data-reader-edition=all-about-l] .paper-shell{margin:0 9px}.hbm-reader[data-reader-edition=all-about-l] .paper{border-radius:5px;padding:24px 18px;font-size:16px;line-height:1.72}.hbm-reader[data-reader-edition=all-about-l] .paper-eyebrow{letter-spacing:.045em;gap:8px;font-size:8px}.hbm-reader[data-reader-edition=all-about-l] .paper h1{margin-bottom:18px;font-size:26px;line-height:1.18}.hbm-reader[data-reader-edition=all-about-l] .paper .lead{padding-bottom:17px;font-size:16px;line-height:1.68}.hbm-reader[data-reader-edition=all-about-l] .paper h2{margin-top:27px;font-size:18px}.hbm-reader[data-reader-edition=all-about-l] .equation-block{gap:2px;margin:12px 0;padding:8px 0}.hbm-reader[data-reader-edition=all-about-l] .equation-scroll{padding:4px 4px 9px}.hbm-reader[data-reader-edition=all-about-l] .equation-scroll mjx-container{font-size:94%}.hbm-reader[data-reader-edition=all-about-l] .equation-help{min-width:33px;padding:6px 2px;font-size:13px}.hbm-reader[data-reader-edition=all-about-l] .equation-help-label{font-size:8px}.hbm-reader[data-reader-edition=all-about-l] .paper-note{font-size:12px}.hbm-reader[data-reader-edition=all-about-l] .paper-references{font-size:10px}.hbm-reader[data-reader-edition=all-about-l] .reader-footer{margin:19px 20px;display:block}.hbm-reader[data-reader-edition=all-about-l] .reader-footer p{text-align:left;margin-top:5px;font-size:10px}.hbm-reader[data-reader-edition=all-about-l] #concept-dialog{border-radius:15px 15px 10px 10px;width:calc(100vw - 16px);max-width:calc(100vw - 16px);max-height:calc(100dvh - 44px)}.hbm-reader[data-reader-edition=all-about-l] .dialog-scroll{padding:18px 20px 23px}.hbm-reader[data-reader-edition=all-about-l] #dialog-title{font-size:25px}.hbm-reader[data-reader-edition=all-about-l] .entry-summary{font-size:14px}.hbm-reader[data-reader-edition=all-about-l] .entry-role{font-size:13px}.hbm-reader[data-reader-edition=all-about-l] .entry-related{gap:6px}.hbm-reader[data-reader-edition=all-about-l] .related-link{min-height:38px;padding:8px 10px}.hbm-reader[data-reader-edition=all-about-l] .dialog-bottom{padding:10px 15px}.hbm-reader[data-reader-edition=all-about-l] .entry-formula{font-size:14px}.hbm-reader[data-reader-edition=all-about-l] .entry-scope{font-size:12px}}@media (prefers-reduced-motion:reduce){.hbm-reader[data-reader-edition=all-about-l] *{scroll-behavior:auto!important;transition:none!important;animation:none!important}}@media print{.hbm-reader[data-reader-edition=all-about-l]{background:#fff}.hbm-reader[data-reader-edition=all-about-l] .reader-header,.hbm-reader[data-reader-edition=all-about-l] .reading-instruction,.hbm-reader[data-reader-edition=all-about-l] .reader-footer,.hbm-reader[data-reader-edition=all-about-l] .equation-help,.hbm-reader[data-reader-edition=all-about-l] .skip-link,.hbm-reader[data-reader-edition=all-about-l] dialog,.hbm-reader[data-reader-edition=all-about-l] .noscript-note{display:none!important}.hbm-reader[data-reader-edition=all-about-l] .paper-shell{max-width:none;margin:0}.hbm-reader[data-reader-edition=all-about-l] .paper{box-shadow:none;border:0;padding:0;font-size:10pt;line-height:1.4}.hbm-reader[data-reader-edition=all-about-l] .paper h1{font-size:20pt}.hbm-reader[data-reader-edition=all-about-l] .paper h2{margin-top:14px;font-size:12pt}.hbm-reader[data-reader-edition=all-about-l] .paper .lead{font-size:10pt}.hbm-reader[data-reader-edition=all-about-l] .paper .concept-link{color:inherit;border:0}.hbm-reader[data-reader-edition=all-about-l] .paper-eyebrow{display:none}.hbm-reader[data-reader-edition=all-about-l] .equation-scroll{overflow:visible}.hbm-reader[data-reader-edition=all-about-l] .equation-block{break-inside:avoid;margin:8px 0}.hbm-reader[data-reader-edition=all-about-l] .paper-note{font-size:8pt}.hbm-reader[data-reader-edition=all-about-l] .paper-references{font-size:7pt}}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail{scrollbar-width:none;scroll-behavior:auto;overflow:auto hidden}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail::-webkit-scrollbar{display:none}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail>span,.hbm-reader[data-reader-edition=all-about-l] .dialog-trail>button{flex:none}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-root,.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-current{text-overflow:ellipsis;white-space:nowrap;max-width:125px;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-root{min-height:30px;color:var(--accent);text-underline-offset:3px;align-items:center;text-decoration:underline;display:inline-flex}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-root:hover{background:var(--wash)}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-current{color:#43594e}.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-paper{font-size:10px}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-root,.hbm-reader[data-reader-edition=all-about-l] .dialog-trail .trail-current{max-width:94px}.hbm-reader[data-reader-edition=all-about-l] .dialog-bottom{font-size:9px}}.hbm-reader[data-reader-edition=all-about-l] .math-symbol{cursor:pointer;color:inherit}.hbm-reader[data-reader-edition=all-about-l] mjx-container a.math-symbol:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.hbm-reader[data-reader-edition=all-about-l] mjx-container a.current-symbol{color:#125b49}.hbm-reader[data-reader-edition=all-about-l] mjx-container a.current-symbol rect[data-hitbox]{fill:#dceee2;fill-opacity:.8;stroke:#77a790;stroke-width:9px}.hbm-reader[data-reader-edition=all-about-l] .entry-occurrences{border-top:1px solid #dae4dc;margin-top:23px;padding-top:19px}.hbm-reader[data-reader-edition=all-about-l] .entry-occurrences h2{font:500 23px/1.2 var(--serif);letter-spacing:-.025em;margin:0 0 5px}.hbm-reader[data-reader-edition=all-about-l] .usage-intro{color:var(--muted);margin:0 0 14px;font-size:12px}.hbm-reader[data-reader-edition=all-about-l] .usage-card{background:#fcfdfb;border:1px solid #dce5dd;border-radius:9px;margin:0 0 12px;padding:13px 14px 12px}.hbm-reader[data-reader-edition=all-about-l] .usage-meta{letter-spacing:.025em;color:#68796e;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:5px;font-size:9px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .usage-meta>span:first-child{text-transform:uppercase;letter-spacing:.075em}.hbm-reader[data-reader-edition=all-about-l] .usage-location{color:var(--accent);font:inherit;text-align:right;text-underline-offset:3px;background:0 0;border:0;padding:0;text-decoration:underline}.hbm-reader[data-reader-edition=all-about-l] .usage-location-text{text-align:right}.hbm-reader[data-reader-edition=all-about-l] .usage-card h3{font:600 13px/1.45 var(--ui);color:#284739;margin:0 0 10px}.hbm-reader[data-reader-edition=all-about-l] .usage-equation{scrollbar-width:thin;border-top:1px solid #ecf0e9;border-bottom:1px solid #ecf0e9;max-width:100%;padding:9px 3px 11px;font-size:14px;overflow:auto hidden}.hbm-reader[data-reader-edition=all-about-l] .usage-explanation{margin:10px 0 0;font-size:12.5px;line-height:1.65}.hbm-reader[data-reader-edition=all-about-l] .symbol-list{color:#586e5f;margin-top:10px;font-size:10.5px}.hbm-reader[data-reader-edition=all-about-l] .symbol-list summary{cursor:pointer;padding:3px 0}.hbm-reader[data-reader-edition=all-about-l] .symbol-index-buttons{flex-wrap:wrap;gap:6px;padding-top:7px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .symbol-index-button{color:#2e6249;text-align:left;background:#f0f6ef;border:1px solid #d4e2d4;border-radius:5px;min-height:31px;padding:6px 8px;font-size:11px;line-height:1.4}.hbm-reader[data-reader-edition=all-about-l] .symbol-index-button:hover{background:#dfeee0}.hbm-reader[data-reader-edition=all-about-l] .notation-details{color:#526b5c;margin:12px 0 0;font-size:12px}.hbm-reader[data-reader-edition=all-about-l] .notation-details summary{cursor:pointer;color:var(--accent);padding:3px 0}.hbm-reader[data-reader-edition=all-about-l] .notation-details p{margin:7px 0;line-height:1.65}.hbm-reader[data-reader-edition=all-about-l] .units-link{color:inherit;font:inherit;background:0 0;border:0;border-bottom:1px dotted #849f8b;padding:0}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .usage-card{padding:12px}.hbm-reader[data-reader-edition=all-about-l] .usage-equation{font-size:13px}.hbm-reader[data-reader-edition=all-about-l] .usage-explanation{font-size:12.5px}.hbm-reader[data-reader-edition=all-about-l] .usage-meta{font-size:9px}.hbm-reader[data-reader-edition=all-about-l] .symbol-index-button{min-height:38px}.hbm-reader[data-reader-edition=all-about-l] .entry-occurrences h2{font-size:23px}}.hbm-reader[data-reader-edition=all-about-l] .jump-uses{font:12px var(--ui);color:var(--accent);background:0 0;border:0;border-bottom:1px dotted #92b5a2;min-height:30px;margin-top:11px;padding:4px 0;display:inline-block}.hbm-reader[data-reader-edition=all-about-l] .jump-uses:hover{background:var(--wash)}.hbm-reader[data-reader-edition=all-about-l] .where-heading-row{justify-content:space-between;align-items:baseline;gap:10px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .definition-return{color:var(--accent);font:10px var(--ui);background:0 0;border:0;flex:none;min-height:30px;padding:4px 0}.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control{max-width:1004px;font:12px var(--ui);color:var(--muted);align-items:center;gap:10px;margin:-5px auto 18px;padding:0 4px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control label{color:var(--ink);font-weight:600}.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control select{font:12px var(--ui);color:var(--accent-deep);background:#fff;border:1px solid #b9d0c5;border-radius:6px;min-height:36px;padding:7px 23px 7px 9px}.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control span{font-size:11px}.hbm-reader[data-reader-edition=all-about-l] .expression-tools{font:11px/1.4 var(--ui);color:var(--muted);background:#f8faf7;border:1px solid #e1e8df;border-radius:7px;min-width:0;margin:-8px 0 17px;padding:6px 8px}.hbm-reader[data-reader-edition=all-about-l] .expression-selection-path{flex-wrap:wrap;align-items:center;gap:5px;min-height:22px;margin-bottom:4px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .expression-scope-chip{color:var(--accent-deep);font:10px/1.4 var(--ui);text-align:left;text-overflow:ellipsis;white-space:nowrap;background:0 0;border:0;border-radius:3px;max-width:210px;padding:3px 4px;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l] .expression-scope-chip:hover{background:#e5f0e9;text-decoration:underline}.hbm-reader[data-reader-edition=all-about-l] .expression-tool-actions{align-items:center;gap:5px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .expression-zoom,.hbm-reader[data-reader-edition=all-about-l] .expression-explain-selection{font:10px/1.4 var(--ui);background:#fff;border:1px solid #d3dfd6;border-radius:4px;min-height:30px;padding:5px 7px}.hbm-reader[data-reader-edition=all-about-l] .expression-explain-selection{color:var(--accent-deep);border-color:#adc7ba;margin-left:auto}.hbm-reader[data-reader-edition=all-about-l] .expression-choose{border-top:1px solid #e4ebe3;margin-top:6px;padding-top:5px}.hbm-reader[data-reader-edition=all-about-l] .expression-choose>summary{cursor:pointer;color:var(--accent);min-height:24px;font-size:10px;display:list-item}.hbm-reader[data-reader-edition=all-about-l] .expression-parts{grid-template-columns:1fr;gap:8px;margin:10px 0;display:grid}.hbm-reader[data-reader-edition=all-about-l] .expression-part{text-align:left;background:#fff;border:1px solid #d0dfd4;border-radius:7px;width:100%;min-height:48px;padding:12px 13px;display:block;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l] .expression-part:hover,.hbm-reader[data-reader-edition=all-about-l] .expression-part:focus-visible{background:#edf5ee;border-color:#689985}.hbm-reader[data-reader-edition=all-about-l] .expression-part-formula{pointer-events:none;padding:2px 0 6px;font-size:16px;display:block;overflow-x:auto}.hbm-reader[data-reader-edition=all-about-l] .expression-part-title{font:12px/1.45 var(--ui);color:var(--accent-deep);padding-top:5px;display:block}.hbm-reader[data-reader-edition=all-about-l] .expression-decomposition{margin:20px 0}.hbm-reader[data-reader-edition=all-about-l] .expression-decomposition h3{font:600 16px/1.4 var(--ui);margin:0 0 5px}.hbm-reader[data-reader-edition=all-about-l] .expression-decomposition>p{font:12px/1.5 var(--ui);color:var(--muted);margin:4px 0 12px}.hbm-reader[data-reader-edition=all-about-l] .expression-context{font:11px var(--ui);color:var(--muted);margin:-5px 0 14px}.hbm-reader[data-reader-edition=all-about-l] .expression-parent{color:var(--accent);font:12px/1.5 var(--ui);text-align:left;background:0 0;border:0;padding:7px 0;display:block}.hbm-reader[data-reader-edition=all-about-l] .expression-parent:hover{text-decoration:underline}.hbm-reader[data-reader-edition=all-about-l] .expression-symbols{margin-top:14px}.hbm-reader[data-reader-edition=all-about-l] .expression-focus-formula{margin-bottom:12px}.hbm-reader[data-reader-edition=all-about-l] .expression-overlay{z-index:2000;pointer-events:none;position:fixed;inset:0}.hbm-reader[data-reader-edition=all-about-l] .expression-overlay[hidden]{display:none}.hbm-reader[data-reader-edition=all-about-l] .expression-outline{pointer-events:none;background:#2d92791a;border:1.7px solid #287758;border-radius:5px;position:fixed;box-shadow:0 0 0 2px #fafffac9}.hbm-reader[data-reader-edition=all-about-l] .expression-hover-label{font:11px/1.4 var(--ui);color:#f4fff8;white-space:normal;pointer-events:none;background:#214e3c;border-radius:4px;padding:4px 7px;position:fixed;box-shadow:0 2px 8px #18332724}.hbm-reader[data-reader-edition=all-about-l] mjx-container[data-expression-ready]{cursor:pointer;outline-offset:3px}.hbm-reader[data-reader-edition=all-about-l][data-math-mode=terms] mjx-container a:hover rect[data-hitbox]{fill:none;stroke:none}.hbm-reader[data-reader-edition=all-about-l][data-math-mode=terms] mjx-container a:hover{color:inherit}.hbm-reader[data-reader-edition=all-about-l] .has-expression-tools{margin-bottom:12px}.hbm-reader[data-reader-edition=all-about-l] .entry-formula+.expression-tools,.hbm-reader[data-reader-edition=all-about-l] .usage-equation+.expression-tools{margin-top:-6px;margin-bottom:17px}.hbm-reader[data-reader-edition=all-about-l] .expression-part mjx-container{cursor:inherit}@media (width>=1000px){.hbm-reader[data-reader-edition=all-about-l] .expression-choose .expression-parts{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}.hbm-reader[data-reader-edition=all-about-l] .dialog-scroll .expression-choose .expression-parts{grid-template-columns:1fr}}@media (width<=1050px){.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control{margin-left:22px;margin-right:22px}}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control{flex-wrap:wrap;gap:7px;margin:0 17px 14px}.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control span{width:100%;font-size:10px}.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control select{min-height:40px;font-size:12px}.hbm-reader[data-reader-edition=all-about-l] .expression-tools{margin-bottom:18px;padding:7px 8px}.hbm-reader[data-reader-edition=all-about-l] .expression-zoom,.hbm-reader[data-reader-edition=all-about-l] .expression-explain-selection{min-height:40px;font-size:10px}.hbm-reader[data-reader-edition=all-about-l] .expression-scope-chip{max-width:160px;min-height:30px}.hbm-reader[data-reader-edition=all-about-l] .expression-choose>summary{min-height:32px;padding-top:6px}.hbm-reader[data-reader-edition=all-about-l] .expression-part{min-height:55px}.hbm-reader[data-reader-edition=all-about-l] .expression-parts{gap:9px}.hbm-reader[data-reader-edition=all-about-l] .expression-hover-label{max-width:250px!important}}@media print{.hbm-reader[data-reader-edition=all-about-l] .expression-tools,.hbm-reader[data-reader-edition=all-about-l] .expression-mode-control,.hbm-reader[data-reader-edition=all-about-l] .expression-overlay{display:none!important}}.hbm-reader[data-reader-edition=all-about-l] .expression-local-mode{color:var(--accent);font:9px/1.3 var(--ui);background:#eef4ee;border:0;border-radius:4px;min-height:30px;padding:4px 5px}.hbm-reader[data-reader-edition=all-about-l] .expression-local-mode:hover{background:#dcece0}.hbm-reader[data-reader-edition=all-about-l] .expression-part svg,.hbm-reader[data-reader-edition=all-about-l] .expression-focus-formula svg{overflow:hidden!important}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .expression-tool-actions{flex-wrap:wrap;gap:3px}.hbm-reader[data-reader-edition=all-about-l] .expression-local-mode{min-height:38px}.hbm-reader[data-reader-edition=all-about-l] .expression-explain-selection{padding:5px}}.hbm-reader[data-reader-edition=all-about-l] .paper .expression-tools{background:0 0;border-color:#e6ece6;margin-top:-8px;padding:4px 8px}.hbm-reader[data-reader-edition=all-about-l] .paper .expression-tools .expression-tool-actions{display:none}.hbm-reader[data-reader-edition=all-about-l] .paper .expression-tools:hover .expression-tool-actions,.hbm-reader[data-reader-edition=all-about-l] .paper .expression-tools:focus-within .expression-tool-actions{display:flex}.hbm-reader[data-reader-edition=all-about-l] .paper .expression-tools .expression-choose{border:0;margin-top:1px;padding-top:0}.hbm-reader[data-reader-edition=all-about-l] .paper .expression-tools .expression-selection-path{min-height:18px;margin-bottom:0}.hbm-reader[data-reader-edition=all-about-l] .paper .expression-tools:has(details[open]) .expression-tool-actions{display:flex}.hbm-reader[data-reader-edition=all-about-l] .expression-selection-path{white-space:nowrap;scrollbar-width:thin;flex-wrap:nowrap;overflow:auto hidden}.hbm-reader[data-reader-edition=all-about-l] .expression-selection-path>*{flex-shrink:0}.hbm-reader[data-reader-edition=all-about-l] .expression-selection-path .expression-scope-chip{max-width:165px}.hbm-reader[data-reader-edition=all-about-l] .expression-tools{box-sizing:border-box;max-width:100%}.hbm-reader[data-reader-edition=all-about-l] .expression-canvas,.hbm-reader[data-reader-edition=all-about-l] .expression-part{-webkit-user-select:none;user-select:none}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .expression-selection-path .expression-scope-chip{max-width:125px}.hbm-reader[data-reader-edition=all-about-l] .expression-tool-actions{flex-wrap:nowrap}.hbm-reader[data-reader-edition=all-about-l] .expression-local-mode{font-size:9px}}.hbm-reader[data-reader-edition=all-about-l] .paper .paper-subtitle{font:14px/1.45 var(--ui);color:var(--muted);max-width:720px;margin:-12px 0 21px}.hbm-reader[data-reader-edition=all-about-l] .paper h3{font:600 17px/1.4 var(--serif);letter-spacing:-.005em;margin:25px 0 10px}.hbm-reader[data-reader-edition=all-about-l] .current-papers{flex-wrap:wrap;align-items:center;gap:9px;max-width:1004px;margin:20px auto 0;padding:0 3px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .current-papers-label{color:var(--muted);margin-right:8px;font-size:12px;font-weight:650}@media (width<=1050px){.hbm-reader[data-reader-edition=all-about-l] .current-papers{margin-left:23px;margin-right:23px}}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .paper .paper-subtitle{margin:-7px 0 18px;font-size:12px}.hbm-reader[data-reader-edition=all-about-l] .paper h3{font-size:16px}.hbm-reader[data-reader-edition=all-about-l] .current-papers{margin:16px 20px}.hbm-reader[data-reader-edition=all-about-l] .current-papers .tool-button{padding:9px 11px;font-size:12px}.hbm-reader[data-reader-edition=all-about-l] .current-papers-label{width:100%}.hbm-reader[data-reader-edition=all-about-l] .reader-brand{letter-spacing:.055em;font-size:8.5px}.hbm-reader[data-reader-edition=all-about-l] .brand-sub{letter-spacing:0}}@media print{.hbm-reader[data-reader-edition=all-about-l] .paper .paper-subtitle{margin:0 0 8px;font-size:9pt}.hbm-reader[data-reader-edition=all-about-l] .paper h3{margin:12px 0 5px;font-size:10pt}.hbm-reader[data-reader-edition=all-about-l] .current-papers{display:none!important}}.hbm-reader[data-reader-edition=all-about-l] .paper+.paper{margin-top:28px}.hbm-reader[data-reader-edition=all-about-l] .paper .part-title{letter-spacing:-.02em;margin:0 0 19px;font-size:28px;line-height:1.2}.hbm-reader[data-reader-edition=all-about-l] .paper h2:not(.part-title){margin-top:25px}.hbm-reader[data-reader-edition=all-about-l] .paper .equation-block{margin:10px 0 13px;padding:8px 0}.hbm-reader[data-reader-edition=all-about-l] #short-notation{color:var(--muted);padding:9px 0 3px;font-size:13px;line-height:1.6}.hbm-reader[data-reader-edition=all-about-l] #short-notation .concept-link{color:var(--accent)}.hbm-reader[data-reader-edition=all-about-l] #canonical-scope{border-left:2px solid #b6ccbf;margin-top:12px;padding-left:13px}.hbm-reader[data-reader-edition=all-about-l] #rindler-closing{margin-bottom:17px}.hbm-reader[data-reader-edition=all-about-l] #curved-scope{border-top:1px solid var(--line);margin-top:21px;padding-top:13px}.hbm-reader[data-reader-edition=all-about-l] #realizations-lead{font-size:14px;line-height:1.6}.hbm-reader[data-reader-edition=all-about-l] .current-papers{flex-wrap:wrap}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .paper+.paper{margin-top:16px}.hbm-reader[data-reader-edition=all-about-l] .paper .part-title{font-size:25px}.hbm-reader[data-reader-edition=all-about-l] .paper h2:not(.part-title){margin-top:22px}.hbm-reader[data-reader-edition=all-about-l] #short-notation{font-size:12px}.hbm-reader[data-reader-edition=all-about-l] #realizations-lead{font-size:13px}.hbm-reader[data-reader-edition=all-about-l] .paper .equation-block{margin:8px 0;padding:6px 0}}@media print{.hbm-reader[data-reader-edition=all-about-l] .paper-realizations{break-before:page}.hbm-reader[data-reader-edition=all-about-l] .paper+.paper{margin-top:0}.hbm-reader[data-reader-edition=all-about-l] .paper .part-title{font-size:17pt}.hbm-reader[data-reader-edition=all-about-l] .current-papers{display:none!important}}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools{text-align:right;background:0 0;border:0;border-radius:0;min-height:19px;margin-top:-7px;margin-bottom:11px;padding:0 4px}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools .expression-selection-path{display:none}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools .expression-choose{margin:0;padding:0}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools .expression-choose>summary{color:#687a70;min-height:20px;padding:1px 0;font-size:10px;list-style:none;display:inline-block}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools .expression-choose>summary:before{content:"▸ ";color:var(--accent)}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools .expression-choose[open]>summary:before{content:"▾ "}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools:focus-within{background:#f7faf7;border:1px solid #dce7df;border-radius:6px;padding:5px 8px}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools:has(details[open]){background:#f7faf7;border:1px solid #dce7df;border-radius:6px;padding:5px 8px}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools:focus-within .expression-selection-path{text-align:left;display:flex}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools:has(details[open]) .expression-selection-path{text-align:left;display:flex}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools .expression-parts{text-align:left}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools .expression-choose>summary{min-height:29px;padding:6px 0}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools{margin-top:-6px;margin-bottom:8px}}body:has(.hbm-reader[data-reader-edition=all-about-l] #concept-dialog[open]){overflow:hidden}.hbm-reader[data-reader-edition=all-about-l]{min-height:calc(100svh - 76px);padding-bottom:1px}.hbm-reader[data-reader-edition=all-about-l] .reader-header{max-width:1060px;padding-top:18px;padding-bottom:14px}.hbm-reader[data-reader-edition=all-about-l] .reader-brand{font:12px/1.4 var(--ui);letter-spacing:.01em;color:var(--muted)}.hbm-reader[data-reader-edition=all-about-l] .reader-brand .brand-glyph,.hbm-reader[data-reader-edition=all-about-l] .reader-brand .brand-sub{display:none}.hbm-reader[data-reader-edition=all-about-l] .tool-button,.hbm-reader[data-reader-edition=all-about-l] .cue-toggle,.hbm-reader[data-reader-edition=all-about-l] .icon-button{box-shadow:none;text-transform:none;letter-spacing:normal}.hbm-reader[data-reader-edition=all-about-l] .reader-footer{line-height:1.6}.hbm-reader[data-reader-edition=all-about-l] .reader-load-notice{max-width:1004px;font:12px/1.5 var(--ui);color:var(--muted);margin:0 auto 12px;padding:8px 14px}.hbm-reader[data-reader-edition=all-about-l] .reader-load-notice[hidden]{display:none}.hbm-reader[data-reader-edition=all-about-l] .reader-retry{font:inherit;color:var(--accent);background:0 0;border:0;min-height:32px;text-decoration:underline}.hbm-reader[data-reader-edition=all-about-l] .nojs-downloads{font:13px var(--ui);text-align:center;padding:12px 20px}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .reader-header{padding:13px 18px 9px}.hbm-reader[data-reader-edition=all-about-l] .reader-brand{font-size:11px}.hbm-reader[data-reader-edition=all-about-l] .reader-load-notice{margin:0 15px 8px}.hbm-reader[data-reader-edition=all-about-l] .reader-tools .tool-button{min-width:42px}}.hbm-reader[data-reader-edition=all-about-l] .reader-options{max-width:1004px;font:11px/1.5 var(--ui);color:var(--muted);margin:0 auto 14px;padding:0 4px}.hbm-reader[data-reader-edition=all-about-l] .reader-options>summary{cursor:pointer;text-align:right;color:var(--accent);padding:3px 0;list-style-position:inside}.hbm-reader[data-reader-edition=all-about-l] .reader-options .expression-mode-control{border:1px solid var(--line);background:#fff;border-radius:5px;margin:8px 0 5px;padding:9px 10px}@media (width<=1050px){.hbm-reader[data-reader-edition=all-about-l] .reader-options{margin-left:22px;margin-right:22px}}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .reader-options{margin:0 18px 11px}.hbm-reader[data-reader-edition=all-about-l] .reader-options>summary{min-height:32px;padding:7px 0}}@media print{.hbm-reader[data-reader-edition=all-about-l] .reader-options{display:none!important}}.hbm-reader[data-reader-edition=all-about-l] .expression-choice-label{font:600 10px/1.5 var(--ui);letter-spacing:.06em;text-transform:uppercase;color:var(--muted);text-align:left;margin:15px 0 7px}.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools:not(:has(details[open])){background:0 0;border:0;border-radius:0;padding:0 4px}:is(.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools:not(:has(details[open])) .expression-selection-path,.hbm-reader[data-reader-edition=all-about-l] .paper>.expression-tools:not(:has(details[open])) .expression-tool-actions){display:none}.hbm-reader[data-reader-edition=all-about-l] .reader-context{background:var(--paper);border:1px solid var(--line);max-width:1004px;color:var(--ink);border-radius:3px;margin:0 auto 18px;overflow:hidden;box-shadow:0 2px 4px #19272206,0 10px 50px #28342d06}.hbm-reader[data-reader-edition=all-about-l] .reader-context>summary{cursor:pointer;color:var(--ink);-webkit-tap-highlight-color:transparent;padding:38px 60px 27px;list-style:none;display:block;position:relative}.hbm-reader[data-reader-edition=all-about-l] .reader-context>summary::-webkit-details-marker{display:none}.hbm-reader[data-reader-edition=all-about-l] .reader-context>summary:hover{background:#fbfcfa}.hbm-reader[data-reader-edition=all-about-l] .reader-context>summary:focus-visible{outline-offset:-4px;border-radius:3px;outline:3px solid #277f73}.hbm-reader[data-reader-edition=all-about-l] .reader-context-title{font:600 31px/1.22 var(--serif);letter-spacing:-.025em;color:#192721;margin:0 0 17px;display:block}.hbm-reader[data-reader-edition=all-about-l] .reader-context-preview{max-height:3.34em;font:17px/1.67 var(--serif);color:var(--ink);padding-right:3px;display:block;position:relative;overflow:hidden}.hbm-reader[data-reader-edition=all-about-l] .reader-context-preview:after{content:"";background:linear-gradient(to bottom,#fff0,var(--paper) 92%);height:1.67em;position:absolute;bottom:0;left:0;right:0}.hbm-reader[data-reader-edition=all-about-l] .reader-context-action{color:var(--accent-deep);font:600 11px/1.5 var(--ui);letter-spacing:.02em;margin-top:10px;display:block}.hbm-reader[data-reader-edition=all-about-l] .reader-context-action:before{content:"Read introduction  +"}.hbm-reader[data-reader-edition=all-about-l] .reader-context[open]>summary{border-bottom:1px solid var(--line);padding-bottom:18px}.hbm-reader[data-reader-edition=all-about-l] .reader-context[open] .reader-context-title{margin-bottom:0}.hbm-reader[data-reader-edition=all-about-l] .reader-context[open] .reader-context-preview{display:none}.hbm-reader[data-reader-edition=all-about-l] .reader-context[open] .reader-context-action{margin:0;position:absolute;top:43px;right:60px}.hbm-reader[data-reader-edition=all-about-l] .reader-context[open] .reader-context-action:before{content:"Close  −"}.hbm-reader[data-reader-edition=all-about-l] .reader-context-body{font:17px/1.67 var(--serif);color:var(--ink);padding:24px 60px 30px}.hbm-reader[data-reader-edition=all-about-l] .reader-context-body p{margin:0 0 15px}.hbm-reader[data-reader-edition=all-about-l] .reader-context-body p:last-child{margin-bottom:0}@media (width<=1050px){.hbm-reader[data-reader-edition=all-about-l] .reader-context{margin-left:20px;margin-right:20px}.hbm-reader[data-reader-edition=all-about-l] .reader-context>summary{padding-left:40px;padding-right:40px}.hbm-reader[data-reader-edition=all-about-l] .reader-context[open] .reader-context-action{right:40px}.hbm-reader[data-reader-edition=all-about-l] .reader-context-body{padding-left:40px;padding-right:40px}}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .reader-context{border-radius:5px;margin:0 9px 12px}.hbm-reader[data-reader-edition=all-about-l] .reader-context>summary{padding:24px 18px 19px}.hbm-reader[data-reader-edition=all-about-l] .reader-context-title{margin-bottom:13px;font-size:26px}.hbm-reader[data-reader-edition=all-about-l] .reader-context-preview{max-height:3.44em;font-size:16px;line-height:1.72}.hbm-reader[data-reader-edition=all-about-l] .reader-context-action{font-size:10px}.hbm-reader[data-reader-edition=all-about-l] .reader-context[open] .reader-context-action{top:30px;right:18px}.hbm-reader[data-reader-edition=all-about-l] .reader-context-body{padding:18px 18px 24px;font-size:16px;line-height:1.72}}@media print{.hbm-reader[data-reader-edition=all-about-l] .reader-context>summary{display:none}.hbm-reader[data-reader-edition=all-about-l] .reader-context{display:none!important}}.hbm-reader[data-reader-edition=all-about-l] .reader-runtime-error{color:#53330a;max-width:1004px;font:14px/1.6 var(--ui);background:#fff7e9;border:1px solid #bf8d53;margin:15px auto;padding:14px 18px}.hbm-reader[data-reader-edition=all-about-l] .reader-modal-backdrop{z-index:2147483000;background:#122c2433;position:fixed;inset:0}.hbm-reader[data-reader-edition=all-about-l] .reader-modal-backdrop[hidden]{display:none}.hbm-reader[data-reader-edition=all-about-l] #concept-dialog.reader-dialog-fallback{z-index:2147483001}.hbm-reader[data-reader-edition=all-about-l] .concept-link{text-underline-offset:3px;border-bottom:0;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}.hbm-reader[data-reader-edition=all-about-l] .concept-link:hover{text-decoration-style:solid}.hbm-reader[data-reader-edition=all-about-l].no-link-cues .paper .concept-link{text-decoration:none}.hbm-reader[data-reader-edition=all-about-l] .concept-link.active-concept{background:#e5f2ed;text-decoration-style:solid}.hbm-reader[data-reader-edition=all-about-l] .math-symbol{cursor:pointer}.hbm-reader[data-reader-edition=all-about-l] .math-symbol:focus-visible{outline-offset:2px;outline:2px solid #19685f}.hbm-reader[data-reader-edition=all-about-l] mjx-container[data-expression-ready],.hbm-reader[data-reader-edition=all-about-l] .expression-canvas{cursor:default}.hbm-reader[data-reader-edition=all-about-l] [data-semantic-entry]{cursor:pointer}.hbm-reader[data-reader-edition=all-about-l] .entry-origin-reading,.hbm-reader[data-reader-edition=all-about-l] .entry-contribution{font:14px/1.64 var(--ui);margin-top:14px}.hbm-reader[data-reader-edition=all-about-l] .semantic-self,.hbm-reader[data-reader-edition=all-about-l] .semantic-inert{cursor:default;color:inherit;outline:none}.hbm-reader[data-reader-edition=all-about-l] .semantic-self rect[data-hitbox],.hbm-reader[data-reader-edition=all-about-l] .semantic-inert rect[data-hitbox]{fill:none;stroke:none}.hbm-reader[data-reader-edition=all-about-l] .current-concept-text{color:inherit}.hbm-reader[data-reader-edition=all-about-l] .semantic-options{flex-wrap:wrap;gap:7px;padding:5px 0;display:flex}.hbm-reader[data-reader-edition=all-about-l] .semantic-options button{font:12px/1.45 var(--ui);min-height:38px;color:var(--accent-deep);background:#f5f9f5;border:1px solid #cadcd2;border-radius:6px;padding:8px 10px}.hbm-reader[data-reader-edition=all-about-l] .semantic-symbol-list{flex-wrap:wrap;gap:6px;margin:10px 0;display:flex}.hbm-reader[data-reader-edition=all-about-l] .semantic-symbol-list button{font:12px var(--ui);min-height:36px;color:var(--accent-deep);background:#fff;border:1px solid #cadcd2;border-radius:5px;padding:7px 9px}.hbm-reader[data-reader-edition=all-about-l] .expression-tools .expression-part{margin:6px 0}.hbm-reader[data-reader-edition=all-about-l] .semantic-no-targets{font:12px/1.5 var(--ui);color:var(--muted)}.hbm-reader[data-reader-edition=all-about-l] .equation-block[data-whole-entry]{cursor:pointer;border-radius:6px}.hbm-reader[data-reader-edition=all-about-l] .equation-block.whole-equation-hover .equation-scroll{background:var(--wash);color:var(--accent-deep);border-radius:5px}.hbm-reader[data-reader-edition=all-about-l] .equation-block.whole-equation-hover .equation-help{color:var(--accent-deep);background:var(--wash);border-color:#b7d0c6}.hbm-reader[data-reader-edition=all-about-l] .equation-block[data-whole-entry] .equation-scroll:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:5px}@media print{.hbm-reader[data-reader-edition=all-about-l] .equation-block.whole-equation-hover .equation-scroll{color:inherit;background:0 0}}.hbm-reader[data-reader-edition=all-about-l] .entry-conditions,.hbm-reader[data-reader-edition=all-about-l] .use-details{border-top:1px solid var(--line);font:12px/1.6 var(--ui);margin:17px 0;padding-top:12px}.hbm-reader[data-reader-edition=all-about-l] .entry-conditions>summary,.hbm-reader[data-reader-edition=all-about-l] .use-details>summary{cursor:pointer;color:var(--accent);min-height:30px}.hbm-reader[data-reader-edition=all-about-l] .entry-origin-reading{font-size:14px;line-height:1.65}.hbm-reader[data-reader-edition=all-about-l] .equation-caption{font:600 12px/1.5 var(--ui);color:var(--accent-deep);margin:20px 0 2px}.hbm-reader[data-reader-edition=all-about-l] .optional-foundation{font:13px/1.65 var(--serif);color:var(--muted);border-left:2px solid #b6ccbf;margin:15px 0 23px;padding:0 0 0 13px}.hbm-reader[data-reader-edition=all-about-l] .optional-foundation>summary{cursor:pointer;color:var(--accent);font:12px/1.6 var(--ui);padding:6px 0}.hbm-reader[data-reader-edition=all-about-l] #curved-scope{border-top:0;padding-top:0}.hbm-reader[data-reader-edition=all-about-l] .paper-realizations h2:not(.part-title){border-top:1px solid var(--line);margin-top:30px;padding-top:23px}.hbm-reader[data-reader-edition=all-about-l] #section-7{margin-top:35px}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .equation-caption{margin-top:17px}.hbm-reader[data-reader-edition=all-about-l] .optional-foundation{font-size:12.5px}}.hbm-reader[data-reader-edition=all-about-l]{letter-spacing:normal;width:100%;min-width:0;font-style:normal;font-weight:400}.hbm-reader[data-reader-edition=all-about-l] .paper-shell{width:min(1004px,100%);margin:0 auto}.hbm-reader[data-reader-edition=all-about-l] .paper{min-width:0;max-width:100%;font-weight:400}.hbm-reader[data-reader-edition=all-about-l] .paper h1{margin-bottom:26px}.hbm-reader[data-reader-edition=all-about-l] .paper p{font-weight:400}.hbm-reader[data-reader-edition=all-about-l] .inline-math{vertical-align:baseline;letter-spacing:normal;border-radius:3px;max-width:100%;padding:0 1px;font-style:normal;font-weight:400;line-height:normal;display:inline-block}.hbm-reader[data-reader-edition=all-about-l] .inline-math mjx-container{max-width:100%;font-size:100%;font-weight:400}.hbm-reader[data-reader-edition=all-about-l] .inline-math mjx-container svg{max-width:100%;height:auto}.hbm-reader[data-reader-edition=all-about-l] .inline-math.whole-equation-hover{background:var(--wash);color:var(--accent-deep)}.hbm-reader[data-reader-edition=all-about-l] .equation-scroll{min-width:0;max-width:100%}.hbm-reader[data-reader-edition=all-about-l] .comparison-wrap{min-width:0;max-width:100%;margin:24px 0 28px}.hbm-reader[data-reader-edition=all-about-l] .comparison{table-layout:fixed;border-collapse:collapse;width:100%;font:14px/1.5 var(--serif)}.hbm-reader[data-reader-edition=all-about-l] .comparison th{font:500 12px/1.4 var(--ui);text-align:left}.hbm-reader[data-reader-edition=all-about-l] .comparison td,.hbm-reader[data-reader-edition=all-about-l] .comparison th{border-bottom:1px solid var(--line);vertical-align:middle;padding:12px 5px}.hbm-reader[data-reader-edition=all-about-l] .comparison .horizon-name{font:500 12px/1.6 var(--ui);width:100px}.hbm-reader[data-reader-edition=all-about-l] .comparison .equation-block{min-height:38px;margin:0;padding:4px 0}.hbm-reader[data-reader-edition=all-about-l] .comparison .equation-scroll{padding:5px 2px}.hbm-reader[data-reader-edition=all-about-l] .comparison-tools{font:11px var(--ui);justify-content:flex-end;margin-top:8px;display:flex}.hbm-reader[data-reader-edition=all-about-l] .definition-row{grid-template-columns:185px minmax(0,1fr);align-items:center;gap:10px;margin:8px 0;display:grid}.hbm-reader[data-reader-edition=all-about-l] .definition-label{font:16px/1.5 var(--serif)}.hbm-reader[data-reader-edition=all-about-l] .definition-content{min-width:0}.hbm-reader[data-reader-edition=all-about-l] .definition-row .equation-block{margin:4px 0;padding:4px 0}.hbm-reader[data-reader-edition=all-about-l] .definition-row .expression-tools{text-align:right;background:0 0;border:0;margin:0;padding:0;font-size:10px}.hbm-reader[data-reader-edition=all-about-l] .definition-row .expression-choose{border:0;margin:0;padding:0}.hbm-reader[data-reader-edition=all-about-l] .definition-row .expression-choose>summary{min-height:22px}.hbm-reader[data-reader-edition=all-about-l] .definition-row .expression-choice-label,.hbm-reader[data-reader-edition=all-about-l] .definition-row .expression-parts{text-align:left}.hbm-reader[data-reader-edition=all-about-l] .expression-choice-label{font:600 11px/1.5 var(--ui);color:var(--muted);margin:8px 0}.hbm-reader[data-reader-edition=all-about-l] #question-one,.hbm-reader[data-reader-edition=all-about-l] #question-two{margin-top:22px;margin-bottom:23px}.hbm-reader[data-reader-edition=all-about-l] #volume-qualification{margin-top:16px;margin-bottom:20px}.hbm-reader[data-reader-edition=all-about-l] #frw-heading,.hbm-reader[data-reader-edition=all-about-l] #schwarzschild-heading,.hbm-reader[data-reader-edition=all-about-l] #rindler-heading{border-top:1px solid var(--line);margin-top:33px;padding-top:17px}@media (width<=1050px){.hbm-reader[data-reader-edition=all-about-l] .paper-shell{width:calc(100% - 24px);margin:0 12px}.hbm-reader[data-reader-edition=all-about-l] .paper{padding:30px 26px}}@media (width<=720px){.hbm-reader[data-reader-edition=all-about-l] .comparison,.hbm-reader[data-reader-edition=all-about-l] .comparison tbody,.hbm-reader[data-reader-edition=all-about-l] .comparison tr{width:100%;display:block}.hbm-reader[data-reader-edition=all-about-l] .comparison thead{display:none}.hbm-reader[data-reader-edition=all-about-l] .comparison tr{border:1px solid var(--line);border-radius:8px;margin-bottom:15px;padding:8px 12px}.hbm-reader[data-reader-edition=all-about-l] .comparison td{grid-template-columns:96px minmax(0,1fr);align-items:center;gap:10px;padding:9px 0;font-size:15px;display:grid}.hbm-reader[data-reader-edition=all-about-l] .comparison td:before{content:attr(data-label);font:11px/1.5 var(--ui);color:var(--muted)}.hbm-reader[data-reader-edition=all-about-l] .comparison td:last-child{border-bottom:0}.hbm-reader[data-reader-edition=all-about-l] .comparison .horizon-name{width:100%;font:600 13px var(--ui);padding:7px 0 12px;display:block}.hbm-reader[data-reader-edition=all-about-l] .definition-row{grid-template-columns:1fr;gap:2px;margin:18px 0}.hbm-reader[data-reader-edition=all-about-l] .definition-label{font-size:15px}}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .paper{padding:25px 17px}.hbm-reader[data-reader-edition=all-about-l] .reader-header{padding:18px 20px}.hbm-reader[data-reader-edition=all-about-l] .inline-math mjx-container{font-size:99%}.hbm-reader[data-reader-edition=all-about-l] .comparison td{grid-template-columns:78px minmax(0,1fr);gap:8px;font-size:14px}}@media print{.hbm-reader[data-reader-edition=all-about-l] .comparison-tools{display:none}.hbm-reader[data-reader-edition=all-about-l] .inline-math.whole-equation-hover{background:0 0}}.hbm-reader[data-reader-edition=all-about-l] .comparison td mjx-container{font-size:110%}.hbm-reader[data-reader-edition=all-about-l] .paper h1{max-width:760px;font-size:clamp(27px,3.4vw,37px);line-height:1.2}.hbm-reader[data-reader-edition=all-about-l] .paper p{margin:15px 0}.hbm-reader[data-reader-edition=all-about-l] .reader-brand{max-width:640px;line-height:1.5}.hbm-reader[data-reader-edition=all-about-l] .paper strong{font-weight:600}.hbm-reader[data-reader-edition=all-about-l] .reader-footer{align-items:flex-start}.hbm-reader .hbm-shared-context .reader-context-body{font-weight:400}.hbm-reader .hbm-shared-context .reader-context-body .concept-link{font:inherit;color:var(--accent-deep,#125148);text-align:inherit;text-underline-offset:3px;cursor:pointer;background:0 0;border:0;padding:0;-webkit-text-decoration:underline dotted;text-decoration:underline dotted;display:inline}.hbm-reader .hbm-shared-context .reader-context-body .concept-link:hover{background:var(--wash,#eef6f2);text-decoration-style:solid}.hbm-reader .hbm-shared-context .reader-context-body .inline-math{white-space:nowrap;vertical-align:baseline;max-width:100%;display:inline-block}.hbm-reader .hbm-shared-context .reader-context-body mjx-container{text-indent:0;font-weight:400;line-height:normal;display:inline-block;font-size:1em!important}.hbm-reader .hbm-shared-context .reader-context-body mjx-container svg{max-width:none;overflow:visible}.hbm-reader .hbm-shared-context .reader-context-body .ctx-math-owner{cursor:pointer}.hbm-reader .hbm-shared-context .reader-context-body .ctx-math-owner:focus-visible{outline:2px solid var(--accent,#19685f);outline-offset:3px;border-radius:3px}.hbm-reader .hbm-shared-context .reader-context-body .ctx-math-owner:hover{background:var(--wash,#eef6f2)}.hbm-reader.no-link-cues .hbm-shared-context .reader-context-body .concept-link{color:inherit;text-decoration:none}@media print{.hbm-reader .hbm-shared-context .concept-link{color:inherit;text-decoration:none}}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction{font-weight:400}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction p,.hbm-reader[data-reader-edition=all-about-l] .reading-instruction strong{color:inherit;font-weight:400}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction-tools{flex:none;align-items:center;gap:10px;margin-left:auto;display:flex}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction-tools .cue-toggle{white-space:nowrap;width:auto}.hbm-reader[data-reader-edition=all-about-l] .equation-scroll:has(g[data-mml-node=mtable]){padding-top:9px;padding-bottom:13px}.hbm-reader[data-reader-edition=all-about-l] g[data-mml-node=mtable]>g[data-mml-node=mtr]:first-child{translate:0 -.18em}.hbm-reader[data-reader-edition=all-about-l] g[data-mml-node=mtable]>g[data-mml-node=mtr]:last-child:not(:first-child){translate:0 .18em}@media (width<=640px){.hbm-reader[data-reader-edition=all-about-l] .reading-instruction{flex-wrap:wrap}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction p{max-width:calc(100% - 19px)}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction-tools{gap:7px;margin-left:auto}.hbm-reader[data-reader-edition=all-about-l] .reading-instruction-tools .cue-toggle{padding:3px 4px;font-size:10px}}