/* A quiet, nonmodal companion to the page. Local tokens keep reader typography out. */
.library-chat-dialog,.library-chat-launcher{--chat-panel:#fff;--chat-soft:#f3f4f1;--chat-ink:#282e2a;--chat-muted:#6b736d;--chat-line:#e9ece7;--chat-accent:#35584d;--chat-strong:#313d35;--chat-on-strong:#fff;--chat-shadow:#25362a14;--chat-font:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--chat-ink);font:14px/1.7 var(--chat-font);box-sizing:border-box}
:root:is([data-site-theme=night],[data-theme=night]) :is(.library-chat-dialog,.library-chat-launcher){--chat-panel:#242826;--chat-soft:#303632;--chat-ink:#e8ece8;--chat-muted:#a6afa8;--chat-line:#3d443e;--chat-accent:#adc6b5;--chat-strong:#d6e1d8;--chat-on-strong:#233026;--chat-shadow:#00000040}
@media(prefers-color-scheme:dark){:root:not([data-site-theme=paper]):not([data-theme=paper]):not([data-theme=sepia]) :is(.library-chat-dialog,.library-chat-launcher){--chat-panel:#242826;--chat-soft:#303632;--chat-ink:#e8ece8;--chat-muted:#a6afa8;--chat-line:#3d443e;--chat-accent:#adc6b5;--chat-strong:#d6e1d8;--chat-on-strong:#233026;--chat-shadow:#00000040}}
.library-chat-dialog{position:fixed;z-index:100;inset:auto 24px 86px auto;margin:0;width:min(420px,calc(100vw - 32px));height:min(590px,calc(100dvh - 110px));max-width:none;max-height:none;padding:0;border:1px solid var(--chat-line);border-radius:22px;background:var(--chat-panel);box-shadow:0 2px 5px var(--chat-shadow),0 16px 48px var(--chat-shadow),0 40px 100px var(--chat-shadow);overflow:hidden;transform-origin:bottom right}
.library-chat-dialog[open]{animation:library-chat-arrive .18s ease-out}.library-chat-dialog *{box-sizing:border-box}.library-chat-dialog [hidden]{display:none!important}.library-chat-dialog :is(p,h2,h3){margin:0}.library-chat-dialog button{font-family:var(--chat-font);cursor:pointer;touch-action:manipulation}.library-chat-dialog :is(button,select,textarea){letter-spacing:normal}.library-chat-dialog button:disabled{cursor:default;opacity:.45}.library-chat-frame{height:100%;display:flex;flex-direction:column;min-height:0}
.library-chat-header{display:flex;align-items:center;gap:8px;padding:16px 14px 10px 25px;flex:none}.library-chat-heading{min-width:0;flex:1}.library-chat-heading h2{font:500 13px/1.6 var(--chat-font);letter-spacing:.015em}.library-chat-book-row{min-width:0}.library-chat-book-choice{display:block;max-width:100%;min-height:25px;padding:2px 18px 2px 0;border:0;border-radius:4px;background:transparent!important;color:var(--chat-muted);font:11px/1.6 var(--chat-font);text-overflow:ellipsis;cursor:pointer}.library-chat-book-choice option{background:var(--chat-panel);color:var(--chat-ink)}
.library-chat-close,.library-chat-menu>summary{display:grid;place-items:center;width:36px;height:36px;padding:0;border:0;border-radius:8px;background:transparent;color:var(--chat-muted);font:22px/1 var(--chat-font);flex:none;cursor:pointer}.library-chat-close:hover,.library-chat-menu>summary:hover{background:var(--chat-soft);color:var(--chat-ink)}.library-chat-menu{position:relative;flex:none}.library-chat-menu>summary{list-style:none;font-size:19px}.library-chat-menu>summary::-webkit-details-marker{display:none}.library-chat-menu-items{position:absolute;top:42px;right:0;z-index:2;min-width:150px;padding:7px;background:var(--chat-panel);border:1px solid var(--chat-line);border-radius:12px;box-shadow:0 8px 30px var(--chat-shadow)}.library-chat-menu-items .library-chat-text-button{padding:6px 12px;width:100%;text-align:left;min-height:38px;text-decoration:none}.library-chat-menu-items .library-chat-text-button:hover{background:var(--chat-soft);border-radius:6px}
.library-chat-messages{flex:1;min-height:60px;overflow:auto;overscroll-behavior:contain;padding:24px 25px 22px;scrollbar-width:thin;scrollbar-color:var(--chat-line) transparent}.library-chat-empty{max-width:300px;margin:25px auto 16px;text-align:left}.library-chat-empty-rule{display:none}.library-chat-empty h3{font:400 20px/1.65 var(--chat-font);margin-bottom:12px}.library-chat-empty>p{font:13px/1.9 var(--chat-font);color:var(--chat-muted)}.library-chat-empty>.library-chat-send,.library-chat-empty>.library-chat-button{margin-top:20px}.library-chat-suggestions{display:grid;gap:3px;margin-top:20px}.library-chat-suggestion{display:block;min-height:38px;text-align:left;padding:7px 0;background:transparent;border:0;color:var(--chat-accent);font:12px/1.8 var(--chat-font)}.library-chat-suggestion:hover{text-decoration:underline;text-underline-offset:4px}
.library-chat-turn{margin:0 0 30px}.library-chat-turn:last-child{margin-bottom:0}.library-chat-question{width:fit-content;max-width:87%;margin-left:auto;border-radius:15px 15px 5px 15px;background:var(--chat-soft);padding:12px 16px}.library-chat-question .library-chat-attribution{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.library-chat-attribution{font:11px/1.6 var(--chat-font);color:var(--chat-muted)}.library-chat-text{white-space:pre-wrap;overflow-wrap:anywhere;font:15px/1.9 var(--chat-font);user-select:text}.library-chat-answer{margin-top:23px}.library-chat-answer-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:8px}.library-chat-answer .library-chat-attribution{color:var(--chat-accent)}.library-chat-references{margin-top:14px;padding-left:12px;border-left:2px solid var(--chat-line)}.library-chat-references>summary{color:var(--chat-accent);font:11px/1.8 var(--chat-font);cursor:pointer;min-height:32px;display:flex;align-items:center;list-style:none}.library-chat-references>summary:after{content:' ＋';margin-left:7px}.library-chat-references[open]>summary:after{content:' −'}.library-chat-references blockquote{margin:8px 0 16px;color:var(--chat-muted);font:12px/1.9 var(--chat-font);white-space:pre-wrap;overflow-wrap:anywhere}.library-chat-source-link{display:block;color:var(--chat-accent);font:11px/1.8 var(--chat-font);margin-top:7px;text-decoration:underline;text-underline-offset:4px;min-height:32px;overflow-wrap:anywhere}.library-chat-turn-status{color:var(--chat-muted);font:12px/1.8 var(--chat-font);padding:17px 0 0}.library-chat-turn-status.is-pending:before{content:'';display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--chat-accent);margin-right:9px;vertical-align:2px;animation:library-chat-breathe 1.5s ease-in-out infinite}
.library-chat-context{margin:0 24px 8px;flex:none;min-height:0}.library-chat-context>summary{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:32px;cursor:pointer;list-style:none;font:11px/1.7 var(--chat-font);color:var(--chat-muted);padding-left:10px;border-left:2px solid var(--chat-line)}.library-chat-context>summary::-webkit-details-marker{display:none}.library-chat-context>summary>span:first-child{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.library-chat-context-hint{font-size:10px;flex:none}.library-chat-context-hint:after{content:' ＋'}.library-chat-context[open] .library-chat-context-hint:after{content:' −'}.library-chat-context-body{max-height:min(190px,25dvh);overflow:auto;padding:0 0 12px 12px;border-left:2px solid var(--chat-line);scrollbar-width:thin;overscroll-behavior:contain}.library-chat-source{margin-top:12px}.library-chat-source-label{color:var(--chat-muted);font:10px/1.8 var(--chat-font);padding-bottom:5px}.library-chat-source>p:not(.library-chat-source-label){font:13px/1.9 var(--chat-font);white-space:pre-wrap;overflow-wrap:anywhere}
.library-chat-status-row{padding:0 24px 8px;flex:none;display:flex;align-items:flex-start;gap:10px}.library-chat-status{font:11px/1.8 var(--chat-font);color:var(--chat-muted);flex:1;overflow-wrap:anywhere}.library-chat-status.has-error{color:var(--chat-ink)}.library-chat-text-button{color:var(--chat-muted);font:11px/1.8 var(--chat-font);padding:0;min-height:30px;white-space:nowrap;border:0;background:transparent}.library-chat-text-button:hover{color:var(--chat-accent)}
.library-chat-composer{flex:none;border:1px solid transparent;border-radius:17px;margin:0 15px;padding:12px 13px 9px;background:var(--chat-soft);transition:border-color .15s,background .15s}.library-chat-composer:focus-within{background:var(--chat-panel);border-color:var(--chat-line);box-shadow:0 0 0 3px color-mix(in srgb,var(--chat-line) 26%,transparent)}.library-chat-composer textarea{display:block;width:100%;height:50px;min-height:40px;max-height:100px;resize:none;border:0!important;padding:0 2px;margin:0;outline:none;box-shadow:none;background:transparent!important;color:var(--chat-ink);font:14px/1.8 var(--chat-font);border-radius:0}.library-chat-composer textarea::placeholder{color:var(--chat-muted);opacity:.85}.library-chat-composer textarea:disabled{opacity:.68;cursor:default}.library-chat-composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:5px;min-height:32px}.library-chat-count{color:var(--chat-muted);font:11px/1.7 var(--chat-font)}.library-chat-count.is-over-limit{color:var(--chat-ink);font-weight:600}.library-chat-composer-actions{display:flex;align-items:center;gap:12px;margin-left:auto}.library-chat-send,.library-chat-button{display:inline-flex;justify-content:center;align-items:center;min-height:38px;padding:7px 15px;border:0;border-radius:9px;background:var(--chat-strong);color:var(--chat-on-strong);font:12px/1.6 var(--chat-font);white-space:nowrap}.library-chat-composer .library-chat-send{width:32px;height:32px;min-height:32px;padding:0;border-radius:50%;font:21px/1 var(--chat-font)}.library-chat-send:not(:disabled):hover,.library-chat-button:not(:disabled):hover{filter:brightness(.92)}.library-chat-stop{font:12px/1.8 var(--chat-font);color:var(--chat-accent);background:transparent;border:0;padding:5px 0;min-height:32px}.library-chat-footer{height:15px;flex:none}.library-chat-hint{font:10px/1.75 var(--chat-font);color:var(--chat-muted)}
.library-chat-dialog :is(button,a,select,summary):focus-visible,.library-chat-launcher:focus-visible{outline:2px solid var(--chat-accent);outline-offset:3px}.library-chat-dialog textarea:focus-visible{outline:none}.library-chat-dialog .sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.library-chat-launcher{position:fixed;z-index:100;right:24px;bottom:max(22px,env(safe-area-inset-bottom));display:grid;place-items:center;width:48px;height:48px;padding:0;background:var(--chat-panel);border:1px solid var(--chat-line);border-radius:50%;box-shadow:0 3px 12px var(--chat-shadow);cursor:pointer;touch-action:manipulation}.library-chat-squirrel{position:relative;display:block;width:36px;height:35px;isolation:isolate}.library-chat-head{position:absolute;left:3px;top:12px;width:25px;height:23px;background:#956e4e;border-radius:44% 44% 46% 46%}.library-chat-head:before,.library-chat-head:after{content:'';position:absolute;top:-8px;width:9px;height:14px;background:#956e4e;border-radius:80% 12% 10% 10%;z-index:-1}.library-chat-head:before{left:1px;transform:rotate(-15deg)}.library-chat-head:after{right:1px;transform:rotate(15deg) scaleX(-1)}.library-chat-eyes{position:absolute;inset:6px 3px 3px;display:flex;justify-content:space-between;gap:3px;background:#f0e4d0;border-radius:40% 40% 50% 50%;padding:1px 3px 5px}.library-chat-eyes i{position:relative;width:5px;height:7px;border-radius:50%;background:#2d3028;transition:transform .18s}.library-chat-eyes i:before{content:'';position:absolute;left:1px;top:1px;width:2px;height:2px;border-radius:50%;background:#f0e4d0}.library-chat-eyes:after{content:'';position:absolute;bottom:1px;left:8px;width:3px;height:3px;background:#2d3028;border-radius:50%}.library-chat-tail{position:absolute;right:0;top:2px;width:17px;height:26px;border:5px solid #ad8766;border-left-width:4px;border-radius:65% 65% 65% 30%;transform:rotate(22deg);z-index:-1}.library-chat-launcher:hover .library-chat-eyes i{transform:translateY(-1px)}.library-chat-launcher.is-waiting .library-chat-tail{animation:library-chat-breathe 1.8s ease-in-out infinite}
@keyframes library-chat-arrive{from{opacity:0;transform:translateY(6px) scale(.99)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes library-chat-breathe{50%{opacity:.35}}
@media(max-width:600px){.library-chat-dialog{inset:auto 8px auto auto;--chat-bottom-space:calc(max(14px,env(safe-area-inset-bottom)) + 62px);top:calc(var(--chat-viewport-top,0px) + max(8px,calc(var(--chat-viewport-height,100dvh) - var(--chat-bottom-space) - 590px)));width:calc(100vw - 16px);height:min(590px,calc(var(--chat-viewport-height,100dvh) - var(--chat-bottom-space) - 8px));border-radius:20px}.library-chat-header{padding:12px 12px 8px 20px}.library-chat-messages{padding:20px}.library-chat-context{margin-right:20px;margin-left:20px}.library-chat-composer{margin-right:12px;margin-left:12px}.library-chat-composer textarea{font-size:16px}.library-chat-question{padding:11px 14px}.library-chat-status-row{padding-right:20px;padding-left:20px}.library-chat-footer{height:12px}.library-chat-launcher{right:14px;bottom:max(14px,env(safe-area-inset-bottom))}.library-chat-context-body{max-height:20dvh}}
@media(pointer:coarse){.library-chat-close,.library-chat-menu>summary{width:44px;height:44px}.library-chat-composer .library-chat-send{width:44px;height:44px}.library-chat-text-button,.library-chat-source-link,.library-chat-references>summary,.library-chat-context>summary,.library-chat-suggestion,.library-chat-stop{min-height:44px}}
@media(max-height:620px){.library-chat-dialog{bottom:70px;height:calc(100dvh - 82px)}.library-chat-header{padding-top:9px;padding-bottom:6px}.library-chat-messages{padding-top:12px;padding-bottom:12px}.library-chat-empty{margin-top:8px}.library-chat-composer textarea{height:40px}.library-chat-footer{height:12px}.library-chat-context-body{max-height:18dvh}}
@media(prefers-reduced-motion:reduce){.library-chat-dialog[open],.library-chat-turn-status.is-pending:before,.library-chat-launcher.is-waiting .library-chat-tail{animation:none}.library-chat-composer,.library-chat-eyes i{transition:none}}

.library-chat-book-title{color:var(--chat-muted);font:11px/1.7 var(--chat-font);overflow:hidden;white-space:nowrap;text-overflow:ellipsis;padding-top:2px}
@media(max-width:600px) and (max-height:620px){.library-chat-dialog{bottom:auto;height:min(590px,calc(var(--chat-viewport-height,100dvh) - var(--chat-bottom-space) - 8px))}}
#library-chat-open[hidden]{display:none!important}

.library-chat-menu-hint{max-width:230px;min-width:190px;padding:8px 12px;font:11px/1.85 var(--chat-font);color:var(--chat-muted);white-space:normal}

/* Keyboard height is a visual-viewport property, including on landscape phones.
   Scroll the whole frame when the fixed sections no longer fit; never clip actions. */
.library-chat-dialog.is-compact-viewport{overflow:clip;top:calc(var(--chat-viewport-top,0px) + 8px);bottom:auto;height:calc(var(--chat-viewport-height,100dvh) - 16px)}
.library-chat-dialog.is-compact-viewport .library-chat-frame{overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;display:block}
.library-chat-dialog.is-compact-viewport .library-chat-header{position:sticky;top:0;z-index:3;background:var(--chat-panel);padding-top:8px;padding-bottom:8px}
.library-chat-dialog.is-compact-viewport .library-chat-messages{min-height:80px;overflow:visible;padding-top:12px;padding-bottom:16px}
.library-chat-dialog.is-compact-viewport .library-chat-context-body{max-height:100px;overflow-y:auto}
.library-chat-dialog.is-compact-viewport .library-chat-composer{margin-top:8px}
.library-chat-dialog.is-compact-viewport .library-chat-footer{height:12px}
/* Own the surface even when the host styles dialog:not(.auth-dialog). */
dialog.library-chat-dialog[aria-modal=false]{background:var(--chat-panel);color:var(--chat-ink);border-color:var(--chat-line)}
dialog.library-chat-dialog[aria-modal=false] textarea{color:var(--chat-ink)}
dialog.library-chat-dialog[aria-modal=false] select{color:var(--chat-muted)}
/* Keep the reader's existing tools beside the companion, while its panel stays
   aligned to the viewport edge rather than following the shifted trigger. */
body:has(#reader-conversation + .library-chat-launcher){--chat-dock-right:max(24px,env(safe-area-inset-right));--chat-dock-bottom:max(22px,env(safe-area-inset-bottom))}
body:has(#reader-conversation + .library-chat-launcher) .library-chat-launcher{right:var(--chat-dock-right);bottom:var(--chat-dock-bottom)}
body:has(#reader-conversation + .library-chat-launcher) .reading-session{right:calc(var(--chat-dock-right) + 60px);bottom:calc(var(--chat-dock-bottom) + 2px)}
body:has(#reader-conversation + .library-chat-launcher) .reading-tools-panel{right:-60px;max-width:calc(100vw - var(--chat-dock-right) - 14px)}
@media(max-width:600px){body:has(#reader-conversation + .library-chat-launcher){--chat-dock-right:max(14px,env(safe-area-inset-right));--chat-dock-bottom:max(14px,env(safe-area-inset-bottom))}}
/* In a keyboard-sized viewport the close button is the available exit; the
   launcher would otherwise cover the composer at the bottom-right corner. */
.library-chat-dialog.is-compact-viewport[open] + .library-chat-launcher{visibility:hidden}
/* Flexible answers keep the companion's existing reading rhythm. */
.library-chat-markdown p{margin:0 0 .85em;white-space:pre-wrap}
.library-chat-markdown p:last-child{margin-bottom:0}
.library-chat-markdown h1,.library-chat-markdown h2,.library-chat-markdown h3,.library-chat-markdown h4,.library-chat-markdown h5,.library-chat-markdown h6{margin:1.15em 0 .55em;font:600 1em/1.65 var(--chat-font);color:var(--chat-ink)}
.library-chat-markdown> :first-child{margin-top:0}
.library-chat-markdown ul,.library-chat-markdown ol{margin:.7em 0;padding-left:1.5em}
.library-chat-markdown li{margin:.35em 0}
.library-chat-markdown a{color:inherit;text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}
.library-chat-markdown blockquote{margin:.8em 0;padding-left:12px;border-left:2px solid var(--chat-line);color:var(--chat-muted)}
.library-chat-markdown code{font:.88em/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;background:color-mix(in srgb,var(--chat-ink) 5%,transparent);border-radius:3px;padding:.1em .25em;overflow-wrap:anywhere}
.library-chat-markdown pre{max-width:100%;overflow:auto;margin:.8em 0;padding:10px;border:1px solid var(--chat-line);border-radius:5px;white-space:pre}
.library-chat-markdown pre code{background:none;padding:0;overflow-wrap:normal}
.library-chat-table{max-width:100%;overflow-x:auto;margin:.85em 0}
.library-chat-table table{width:100%;border-collapse:collapse;font:.9em/1.7 var(--chat-font);text-align:left}
.library-chat-table th,.library-chat-table td{min-width:90px;padding:7px 9px;border:1px solid var(--chat-line);vertical-align:top}
.library-chat-table th{font-weight:600}
.library-chat-activity,.library-chat-activity-details{margin:10px 0 0;font:11px/1.8 var(--chat-font);color:var(--chat-muted)}
.library-chat-activity-details summary{cursor:pointer}
.library-chat-activity-details p{margin:3px 0}
.library-chat-recommendations{margin-top:18px}
.library-chat-recommendation{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-top:7px;padding:9px 0;border-bottom:1px solid var(--chat-line);color:inherit;text-decoration:none;font:12px/1.7 var(--chat-font)}
.library-chat-recommendation small{flex-shrink:0;color:var(--chat-muted);font-size:10px}