:root{--font-cjk:"PingFang HK","PingFang TC","Microsoft JhengHei","Noto Sans CJK TC","Noto Sans TC","Hiragino Sans CNS",sans-serif;--font-cjk-ui:"PingFang HK","PingFang TC","Microsoft JhengHei","Noto Sans CJK TC","Noto Sans TC",sans-serif;--font-serif:var(--font-serif-face),var(--font-cjk),Georgia,"Times New Roman",serif;--font-ui:var(--font-ui-face),var(--font-cjk-ui),system-ui,-apple-system,"Segoe UI",sans-serif;--measure-page:46rem;--measure-wide:64rem;--measure-read:37rem;--measure-room:34rem;--lh-read:1.66}:root:lang(zh-Hans),:root:lang(zh-Hant-HK),:root:lang(zh-Hant-TW){--measure-read:34rem;--lh-read:1.85}:lang(zh-Hans),:lang(zh-Hant-HK),:lang(zh-Hant-TW){letter-spacing:.012em;line-break:strict}:lang(zh-Hans) :is(.stage-direction,.mastery-floor-words,em,i,cite),:lang(zh-Hant-HK) :is(.stage-direction,.mastery-floor-words,em,i,cite),:lang(zh-Hant-TW) :is(.stage-direction,.mastery-floor-words,em,i,cite){font-style:normal;letter-spacing:.18em}:lang(zh-Hans) :is(.kicker,.ulabel,.fence-label,.margin-label,.speaker-label-tutor,.contents-title),:lang(zh-Hant-HK) :is(.kicker,.ulabel,.fence-label,.margin-label,.speaker-label-tutor,.contents-title),:lang(zh-Hant-TW) :is(.kicker,.ulabel,.fence-label,.margin-label,.speaker-label-tutor,.contents-title){text-transform:none;letter-spacing:.22em}*{box-sizing:border-box}html{text-size-adjust:100%}body,html{overflow-x:clip}body{margin:0;background:var(--appearance-page,var(--paper));color:var(--ink);font-family:var(--font-serif);font-size:var(--reader-size,17px);line-height:var(--lh-read);-webkit-font-smoothing:antialiased}html[data-type-size="1"]{--reader-size:16px}html[data-type-size="2"]{--reader-size:18px}html[data-type-size="3"]{--reader-size:21px}html[data-type-size="4"]{--reader-size:25px}.site-header{position:relative;z-index:20;border-bottom:1px solid var(--rule);background:var(--paper-lifted);box-shadow:var(--shadow-1)}@media (max-width:47.99rem){.site-header-lesson{position:absolute;top:0;inset-inline:0;z-index:20;transition:transform .28s cubic-bezier(.32,.72,0,1);will-change:transform}.site-header-lesson.site-chrome-hidden:not(:has(.lang-switcher[open])){transform:translateY(calc(-100% - 16px))}}@media (prefers-reduced-motion:reduce){.site-header-lesson{transition:none}}.site-header-row{max-width:var(--measure-wide);margin:0 auto;min-height:64px;padding:8px 16px;position:relative;display:flex;align-items:center;gap:12px;font-family:var(--font-ui)}.site-header-row .wordmark{flex:0 0 auto}.site-menu-toggle{min-height:44px;margin-left:auto;padding:0 12px;display:inline-flex;align-items:center;gap:9px;border:1px solid var(--rule);border-radius:999px;background:var(--paper-lifted);color:var(--ink);font:650 13px/1 var(--font-ui);cursor:pointer}.site-menu-toggle:hover,.site-menu-toggle[aria-expanded=true]{border-color:var(--accent-line);background:var(--accent-wash);color:var(--accent)}.site-menu-icon{width:14px;display:grid;grid-gap:4px;gap:4px}.site-menu-icon i{display:block;height:1px;background:currentColor}.site-header-panel{display:none;position:absolute;inset:calc(100% + 1px) 0 auto;padding:16px;border:1px solid var(--rule);border-top:0;border-radius:0 0 12px 12px;background:var(--paper-lifted);box-shadow:var(--shadow-2)}.site-header-panel[data-open=true]{display:grid;grid-gap:16px;gap:16px}.site-header-utilities{padding-top:12px;display:flex;align-items:center;gap:10px;border-top:1px solid var(--rule)}.site-header-utilities .lang-switcher{margin-left:auto}.sr-only{clip:rect(0,0,0,0)}.wordmark{min-height:44px;display:inline-flex;align-items:center;gap:7px;font-family:var(--font-serif);font-size:16px;font-weight:600;color:var(--ink);text-decoration:none;white-space:nowrap}.wordmark .shell-mark{width:20px;height:17.5px;color:var(--accent);flex:0 0 auto}.shell-mark path{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.shell-mark .rib{stroke-width:1.1;opacity:.62}.site-nav{min-width:0}.session-links{display:none}:root:not([data-session=signed-in]) .session-links-public,:root[data-session=signed-in] .session-links-signed,:root[data-session=signed-out] .session-links-public{display:contents}.session-links-desktop{display:none}.session-links-mobile{display:grid;grid-gap:16px;gap:16px}.site-menu-group{min-width:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:2px 8px;gap:2px 8px}.site-menu-group-label{grid-column:1/-1;margin:0 0 3px;color:var(--ink-muted);font:700 10.5px/1.4 var(--font-ui);letter-spacing:.12em;text-transform:uppercase}.site-nav a{display:inline-flex;align-items:center;min-height:44px;font-size:13.5px;color:var(--ink-muted);text-decoration:none;padding:0 8px;border-radius:7px}.site-nav a:hover{color:var(--ink)}.site-nav a[aria-current=page]{color:var(--ink);background:var(--accent-wash);box-shadow:inset 3px 0 0 var(--accent)}.site-nav .nav-sign-in{justify-content:center;border:1px solid var(--accent-line);color:var(--accent);font-weight:700}.profile-nav{position:relative}.profile-nav summary{min-height:44px;padding:0 8px;display:inline-flex;align-items:center;color:var(--ink-muted);font-size:13.5px;cursor:pointer;list-style:none}.profile-nav summary::-webkit-details-marker{display:none}.profile-nav summary::marker{content:""}.profile-nav summary:after{content:"";width:.34rem;height:.34rem;margin-left:.45rem;border-right:1px solid;border-bottom:1px solid;color:var(--ink-muted);transform:rotate(45deg) translateY(-.08rem)}.profile-nav[open] summary:after{transform:rotate(225deg) translate(-.05rem,-.05rem)}.profile-nav summary:hover,.profile-nav[data-current=true] summary,.profile-nav[open] summary{color:var(--ink)}.profile-nav[data-current=true] summary{box-shadow:inset 0 -2px 0 var(--accent)}.profile-nav-menu{position:absolute;top:calc(100% + 5px);right:0;min-width:10rem;padding:6px;display:grid;border:1px solid var(--rule);border-radius:10px;background:var(--raised);box-shadow:var(--shadow-2);z-index:6}@media (min-width:48rem){.site-header-row{gap:16px}.site-menu-toggle{display:none}.site-header-panel,.site-header-panel[data-open=true]{min-width:0;margin-left:auto;padding:0;position:static;display:flex;align-items:center;gap:12px;border:0;border-radius:0;background:transparent;box-shadow:none}.site-nav{margin-left:auto}.session-links-mobile{display:none}.session-links-desktop{display:flex;align-items:center;gap:2px 6px}.site-header-utilities{padding-top:0;display:flex;gap:8px;border-top:0}.site-header-utilities .lang-switcher{margin-left:0}.site-nav a[aria-current=page]{background:transparent;box-shadow:inset 0 -2px 0 var(--accent)}}.lang-switcher{position:relative;font-family:var(--font-ui)}.lang-switcher-trigger{display:flex;align-items:center;gap:5px;min-height:44px;padding:7px 10px;border-radius:999px;border:1.5px solid var(--accent);background:var(--accent-wash);color:var(--accent);font-size:12.5px;font-weight:700;line-height:1.2;cursor:pointer;list-style:none;max-width:9.5rem}.lang-switcher-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}.lang-switcher-trigger::-webkit-details-marker{display:none}.lang-switcher-trigger::marker{content:""}.lang-switcher-trigger:hover,.lang-switcher[open] .lang-switcher-trigger{background:var(--accent);color:var(--raised)}.lang-globe{flex:0 0 auto}.lang-switcher-menu{position:absolute;top:calc(100% + 6px);right:0;display:flex;flex-direction:column;min-width:8.5rem;max-width:min(18rem,calc(100vw - 24px));padding:6px;border-radius:10px;border:1px solid var(--rule);background:var(--raised);box-shadow:var(--shadow-2);z-index:5}.lang-switcher-menu a{min-height:44px;display:flex;align-items:center;padding:7px 10px;border-radius:6px;font-size:13.5px;color:var(--ink);text-decoration:none;white-space:normal}.lang-switcher-menu a:focus-visible,.lang-switcher-menu a:hover{background:var(--accent-wash)}.lang-switcher-menu a[aria-current=true]{color:var(--accent);font-weight:700}main.page{max-width:var(--measure-page);margin:0 auto;padding:28px 16px 96px}.page-read{max-width:var(--measure-read);margin-inline:auto}.page-read .fence,.page-read .fig,.page-read .katex-display,.page-read .receipts{width:min(var(--measure-page),100%);margin-inline:auto}.site-footer{border-top:1px solid var(--rule);font-family:var(--font-ui);font-size:12.5px;color:var(--ink-muted)}.site-footer-row{max-width:var(--measure-wide);margin:0 auto;padding:18px 16px 40px;display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 18px}.site-footer-row p{margin:0}.site-footer-legal{display:flex;flex-wrap:wrap;gap:14px;margin-left:auto}.site-footer-legal a{min-height:44px;display:inline-flex;align-items:center;color:var(--ink-muted);text-decoration:none}.site-footer-legal a:hover{color:var(--ink)}.whats-new-dot{display:inline-block;width:6px;height:6px;margin-left:2px;border-radius:50%;background:var(--accent);vertical-align:middle}h1{font-family:var(--font-serif);font-size:1.9em;line-height:1.15;font-weight:600;letter-spacing:-.012em;font-variation-settings:"opsz" 42;margin:.4em 0}h1,h2{text-wrap:balance}h2{font-family:var(--font-serif);font-size:1.3em;line-height:1.25;font-weight:600;letter-spacing:-.004em;font-variation-settings:"opsz" 24;margin:0 0 .7em}main.page>h2{margin-top:1.8em}p{margin:0 0 .85em;color:var(--ink-read);font-weight:var(--read-wght);letter-spacing:var(--read-track)}a{color:var(--accent)}code{font-family:ui-monospace,Cascadia Code,Consolas,monospace;font-size:.85em;background:var(--accent-wash);padding:1px 5px;border-radius:4px;overflow-wrap:anywhere}.kicker{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-muted);margin:0 0 6px}.draft-banner,.kicker{font-family:var(--font-ui)}.draft-banner{display:block;font-size:13.5px;line-height:1.5;color:var(--ink);background:color-mix(in srgb,var(--danger) 12%,var(--raised));border:1px solid color-mix(in srgb,var(--danger) 38%,var(--raised));border-radius:8px;padding:12px 16px;margin:0 0 20px}.draft-banner strong{color:var(--danger)}.lang-notice{line-height:1.5;border-left:2px solid var(--rule);padding:6px 0 6px 14px;margin:0 0 20px}.lang-notice,.meta-row{font-family:var(--font-ui);font-size:13px;color:var(--ink-muted)}.meta-row{display:flex;flex-wrap:wrap;gap:6px 18px;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:10px 0;margin:14px 0 22px;align-items:center}.lead,.lead p{font-size:1.1em;line-height:1.6}.unit{margin:2em 0;scroll-margin-top:16px}.synth-chip{font-family:var(--font-ui);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);border:1px solid var(--accent-line,var(--line,rgba(154,105,20,.34)));border-radius:999px;padding:2px 8px;vertical-align:3px;margin-left:8px;font-weight:600}.ublock{margin:0 0 .85em}.ublock p{margin:0}.ulabel{display:block;font-family:var(--font-ui);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:2px}.ublock-trap .ulabel{color:var(--danger)}.fence{border-top:1px solid var(--rule,var(--line,#e3dbcc));border-bottom:1px solid var(--rule,var(--line,#e3dbcc));background:var(--raised);padding:14px 16px 8px;margin:1.1em 0}.fence-label{display:block;font-family:var(--font-ui);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-muted);margin-bottom:8px}.fence-worked .fence-label{color:var(--accent)}.fence ol,.fence ul{margin:0 0 .8em;padding-left:22px}.fence li{margin-bottom:.5em}.layer{margin:.9em 0}.layer>summary{cursor:pointer;font-family:var(--font-ui);font-size:12.5px;font-weight:600;letter-spacing:.04em;color:var(--accent);list-style:none;display:inline-flex;align-items:center;gap:7px;padding:4px 0}.layer>summary::-webkit-details-marker{display:none}.layer>summary:before{content:"";width:7px;height:7px;border-right:1.5px solid;border-bottom:1.5px solid;transform:rotate(-45deg);transition:transform .15s}.layer[open]>summary:before{transform:rotate(45deg)}.layer-body{border-left:2px solid var(--accent-line,var(--line,rgba(154,105,20,.34)));padding:4px 0 2px 16px;margin:6px 0 4px 3px}.layer-body>:last-child{margin-bottom:0}@media (prefers-reduced-motion:reduce){.layer>summary:before{transition:none}}.clink-root{position:relative}.clink{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:none;border:none;padding:0;margin:0;cursor:pointer;font:inherit;color:inherit;-webkit-text-decoration:underline dotted var(--accent-line,var(--line,rgba(154,105,20,.34)));text-decoration:underline dotted var(--accent-line,var(--line,rgba(154,105,20,.34)));text-decoration-thickness:1px;text-underline-offset:3px}.clink:hover{color:var(--accent)}.clink-text{color:inherit}.abbr-root{position:relative}.abbrmark{font:inherit;color:inherit;text-decoration:none;cursor:help}.abbrmark:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}.abbr-bubble{width:max-content;max-width:min(18rem,calc(100vw - 32px));padding:8px 12px;font-family:var(--font-ui);color:var(--ink)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;-webkit-clip-path:inset(50%);clip-path:inset(50%);white-space:nowrap;border:0}.cite{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:none;border:none;cursor:pointer;padding:0 1px;font-family:var(--font-ui);font-size:11px;font-weight:600;color:var(--accent)}.cite:hover{text-decoration:underline}.bubble{position:absolute;z-index:50;top:calc(100% + 8px);left:0;width:min(24rem,calc(100vw - 32px));background:var(--raised);color:var(--ink);border:1px solid var(--rule,var(--line,#e3dbcc));border-radius:10px;box-shadow:var(--shadow-3,0 3px 10px rgba(74,58,34,.09),0 26px 60px -28px rgba(74,58,34,.38));padding:14px 16px;font-size:15px;line-height:1.55;display:block}.abbr-bubble{width:min(16rem,calc(100vw - 32px));font-size:13.5px;padding:10px 12px}.bubble-name{font-size:13px;margin-bottom:6px;padding-right:20px}.bubble-label,.bubble-name{display:block;font-family:var(--font-ui);font-weight:700}.bubble-label{font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:3px}.bubble-body{display:block;margin-bottom:8px}.bubble-jump{font-family:var(--font-ui);font-size:12.5px;font-weight:600;color:var(--accent);text-decoration:none}.bubble-close{position:absolute;top:6px;right:8px;background:none;border:none;color:var(--ink-muted);font-size:16px;cursor:pointer;padding:2px 6px}.fig{margin:1.2em 0}.fig-canvas{background:var(--fig-paper,var(--raised,#fbf7f0));border:1px solid var(--rule,var(--line,#e3dbcc));border-radius:8px;padding:10px}.fig-canvas img{width:100%;height:auto;display:block}figcaption{font-family:var(--font-ui);font-size:13px;color:var(--ink-muted);line-height:1.5;margin-top:8px}.fig-script,.fig-widget{display:block;font-size:11.5px;margin-top:3px;opacity:.85}.fig-widget{color:var(--accent)}.katex{font-size:1.04em}.katex-display{overflow-x:auto;overflow-y:hidden;text-align:left;margin:.8em 0;padding:2px 0 2px 1.1em}.katex-display>.katex{text-align:left;font-size:1.12em}.mathdisplay{display:block;overflow-x:auto;overflow-y:hidden;margin:.7em 0;padding:2px 0 2px 1.1em}.mathdisplay .katex{font-size:1.12em}.mathpunct{font-size:1.05em;margin-left:2px}section:target .ublock-definition{animation:defflash 2s ease-out}@keyframes defflash{0%{background:var(--accent-wash);box-shadow:0 0 0 6px var(--accent-wash)}to{background:transparent;box-shadow:none}}@media (prefers-reduced-motion:reduce){section:target .ublock-definition{animation:none;background:var(--accent-wash)}}.contents{font-family:var(--font-ui);font-size:13.5px;border:1px solid var(--rule);border-radius:8px;padding:12px 16px;margin:0 0 24px;background:var(--raised)}.contents-title{font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-muted);margin:0 0 8px}.contents ol{margin:0;padding-left:20px}.contents li{margin-bottom:4px}.contents a{text-decoration:none;color:var(--ink)}.contents a:hover{color:var(--accent)}.chapter-nav{display:flex;justify-content:space-between;gap:12px;font-family:var(--font-ui);font-size:13.5px;border-top:1px solid var(--rule);margin-top:40px;padding-top:16px}.chapter-nav a{text-decoration:none}.sources-list{font-family:var(--font-ui);font-size:13.5px;color:var(--ink-muted);padding-left:0;list-style:none;margin:0}.sources-list li{margin-bottom:6px}.src-n{display:inline-block;min-width:18px;color:var(--accent);font-weight:700}.experiment-panel{display:flex;flex-direction:column;align-items:flex-start;gap:10px;background:var(--raised);box-shadow:var(--shadow-2),var(--lit);border-radius:14px;padding:18px 22px;margin:24px 0}.experiment-disclosure{margin:0;font-size:.85rem;color:var(--ink-muted)}.experiment-finished{margin:0;font-weight:600;color:var(--ink)}.ask-tutor{position:relative;z-index:0;overflow:hidden;background:var(--raised);box-shadow:var(--shadow-2),var(--lit);border-radius:14px;padding:20px 22px;margin:36px 0 0}.ask-tutor:before{content:"";position:absolute;z-index:-1;inset:auto -10% -70% -10%;height:220px;background:var(--lamp);transform:rotate(180deg);pointer-events:none}.ask-tutor h2{font-size:1.05em;margin-bottom:.3em}.ask-tutor p{font-size:.92em;color:var(--ink-muted);margin-bottom:.6em}.ask-tutor a{font-family:var(--font-ui);font-size:13.5px;font-weight:600}.type-size{display:inline-flex;gap:2px;align-items:baseline;margin-left:auto}.type-size-step{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:none;border:1px solid transparent;border-radius:4px;cursor:pointer;color:var(--ink-muted);font-family:var(--font-serif);padding:1px 6px;line-height:1.2}.type-size-step[aria-pressed=true]{color:var(--accent);border-color:var(--accent)}.theme-control{-webkit-appearance:none;-moz-appearance:none;appearance:none;min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--paper-lifted);border:1px solid var(--surface-border);border-radius:var(--radius-control);cursor:pointer;padding:9px 12px;font:600 12px/1.4 var(--font-ui);color:var(--ink-muted)}.theme-icon{flex-shrink:0}.theme-control:focus-visible,.theme-control:hover{border-color:var(--accent);color:var(--ink)}.chapter-list{list-style:none;padding:0;margin:0}.chapter-list li{border-bottom:1px solid var(--rule);padding:14px 0}.chapter-list a{text-decoration:none;color:var(--ink);font-weight:600}.chapter-list a:hover{color:var(--accent)}.chapter-list .sub{font-family:var(--font-ui);font-size:13px;color:var(--ink-muted);margin-top:3px}.chapter-title-line{margin:0;font-weight:600;color:var(--ink)}.chapter-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:8px;min-height:44px}@media (min-width:48rem){.chapter-actions{justify-content:flex-end;margin-top:0}}.book-learn-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto;min-height:44px}.book-learn-confirm{flex:1 1 auto;min-width:0;flex-wrap:wrap}.book-learn-confirm-text,.book-learn-trial-ended{flex:1 1 100%;overflow-wrap:anywhere}.book-learn-trial-ended{min-width:0;font-family:var(--font-ui);font-size:13px;line-height:1.45;color:var(--ink-muted)}.book-learn-signin{min-height:44px;display:inline-flex;align-items:center;font-size:13px;color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}.book-learn-signin:hover{text-decoration:underline}.receipts{overflow-x:auto;border:1px solid var(--rule);border-radius:8px;margin:1em 0}.receipts table{border-collapse:collapse;width:100%;min-width:640px;font-family:var(--font-ui);font-size:13.5px}.receipts th{text-align:left;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-muted)}.receipts td,.receipts th{border-bottom:1px solid var(--rule);padding:10px 12px}.receipts td{vertical-align:top}.receipts tr:last-child td{border-bottom:none}.correction{border-left:3px solid var(--danger);padding:2px 0 2px 14px;margin:0 0 1em}:root{--highlight-a:var(--accent-wash);--highlight-b:var(--cool-wash);--highlight-c:color-mix(in srgb,var(--accent) 42%,var(--paper));--highlight-d:color-mix(in srgb,var(--danger) 30%,var(--paper))}mark.shello-highlight{background:var(--highlight-a);color:inherit;border-radius:.2em;box-decoration-break:clone;-webkit-box-decoration-break:clone;padding:.02em .1em}mark.shello-highlight[data-color=b]{background:var(--highlight-b)}mark.shello-highlight[data-color=c]{background:var(--highlight-c)}mark.shello-highlight[data-color=d]{background:var(--highlight-d)}.selection-toolbar{position:fixed;z-index:60;display:flex;align-items:center;gap:2px;padding:4px;border-radius:12px;border:1px solid var(--rule);background:var(--raised);box-shadow:var(--shadow-2)}.selection-toolbar-swatches{display:flex;gap:2px;padding-right:4px;margin-right:2px;border-right:1px solid var(--rule)}.selection-toolbar-btn{width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;border:none;background:transparent;border-radius:8px;color:var(--ink);cursor:pointer}.selection-toolbar-btn:focus-visible,.selection-toolbar-btn:hover{background:var(--accent-wash)}.selection-toolbar-btn[disabled]{opacity:.45;cursor:not-allowed}.selection-toolbar-swatch{width:18px;height:18px;border-radius:50%;border:2px solid var(--rule)}.selection-toolbar-swatch[data-color=a]{background:var(--highlight-a)}.selection-toolbar-swatch[data-color=b]{background:var(--highlight-b)}.selection-toolbar-swatch[data-color=c]{background:var(--highlight-c)}.selection-toolbar-swatch[data-color=d]{background:var(--highlight-d)}.selection-toolbar-swatch[aria-pressed=true]{border-color:var(--accent)}.selection-toolbar-popover{position:fixed;z-index:60;max-width:min(22rem,calc(100vw - 24px));padding:12px 14px;border-radius:12px;border:1px solid var(--rule);background:var(--raised);box-shadow:var(--shadow-2);color:var(--ink);font-size:.95rem;line-height:1.55}.selection-toolbar-popover-head{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:6px}.selection-toolbar-popover-body{white-space:pre-wrap}.selection-toolbar-popover-loading{color:var(--ink-muted)}.selection-storage-error{position:fixed;z-index:61;left:50%;bottom:18px;width:min(32rem,calc(100vw - 24px));margin:0;padding:12px 14px;transform:translateX(-50%);border:1px solid var(--danger);border-radius:10px;background:var(--raised);color:var(--danger);box-shadow:var(--shadow-2);font:600 13px/1.45 var(--font-ui)}.report-act{margin:10px auto 0;display:block;border:none;background:transparent;color:var(--ink-muted);font:500 13px/1.4 var(--font-ui);text-decoration:underline;text-underline-offset:3px;cursor:pointer}.report-act:focus-visible,.report-act:hover{color:var(--ink)}.report-dialog{margin:10px 0 0;padding:12px 14px 14px;border:1px solid var(--rule);border-radius:12px;background:var(--raised);text-align:left}.report-dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin-bottom:8px}.report-dialog-close{flex:none;width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;border:none;background:transparent;border-radius:8px;color:var(--ink-muted);cursor:pointer}.report-dialog-close:focus-visible,.report-dialog-close:hover{color:var(--ink);background:var(--accent-wash)}.report-dialog label{display:block;margin-bottom:4px;font:500 13.5px/1.4 var(--font-ui);color:var(--ink-muted)}.report-words{width:100%;box-sizing:border-box;padding:8px 10px;border:1px solid var(--rule);border-radius:10px;background:var(--surface);color:var(--ink);font:400 16px/1.5 var(--font-ui);resize:vertical}.report-actions{display:flex;justify-content:flex-end;margin-top:10px}.report-error{margin:8px 0 0;color:var(--danger);font:600 13px/1.45 var(--font-ui)}.report-sent{display:flex;align-items:flex-start;justify-content:space-between;gap:8px;margin:10px 0 0;color:var(--ink-muted);font:400 13.5px/1.5 var(--font-ui)}.report-popover{max-width:min(26rem,calc(100vw - 24px))}.report-list{margin:0;padding:0;list-style:none;display:grid;grid-gap:12px;gap:12px}.report-row{display:grid;grid-gap:2px;gap:2px;padding-left:10px;border-left:2px solid var(--rule)}.report-row-text{color:var(--ink);font:400 14px/1.5 var(--font-ui)}.report-row-outcome,.report-row-reason{color:var(--ink-muted);font:400 13.5px/1.5 var(--font-ui)}:is(button,a,summary,input,textarea,select):focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}@media (prefers-reduced-motion:reduce){*,:after,:before{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}.book-card-link:hover .book-cover{transform:none}}main.page{animation:page-settle .24s cubic-bezier(.2,.6,.2,1)}@keyframes page-settle{0%{opacity:0;transform:translateY(4px)}}@font-face{font-family:"sourceSerif";src:url(/_next/static/media/14ca4067a94f5022-s.p.woff2) format("woff2");font-display:swap;font-style:normal}@font-face{font-family:"sourceSerif";src:url(/_next/static/media/7979c060dda8873f-s.p.woff2) format("woff2");font-display:swap;font-style:italic}@font-face{font-family:"sourceSerif Fallback";src:local("Arial");ascent-override:102.41%;descent-override:33.12%;line-gap-override:0.00%;size-adjust:101.16%}.__className_f7e545{font-family:"sourceSerif","sourceSerif Fallback"}.__variable_f7e545{--font-serif-face:"sourceSerif","sourceSerif Fallback"}@font-face{font-family:inter;src:url(/_next/static/media/6c596dfcddeca1e9-s.p.woff2) format("woff2");font-display:swap}@font-face{font-family:inter Fallback;src:local("Arial");ascent-override:89.79%;descent-override:22.36%;line-gap-override:0.00%;size-adjust:107.89%}.__className_528daf{font-family:inter,inter Fallback}.__variable_528daf{--font-ui-face:"inter","inter Fallback"}