.learn-root,.learn-tokens{--learn-bg:var(--surface-canvas);--learn-bg-raised:var(--surface-raised);--learn-bg-elevated:var(--surface-sunken);--learn-border:var(--border-subtle);--learn-border-strong:var(--border-default);--learn-border-accent:var(--accent-400);--learn-text:var(--ink-900);--learn-prose-body:var(--ink-700);--learn-text-secondary:var(--ink-500);--learn-text-tertiary:var(--ink-400);--learn-code-bg:var(--surface-sunken-2);--learn-accent:var(--accent-500);--learn-accent-soft:var(--accent-50);--learn-accent-glow:var(--accent-500);--learn-selection:var(--selection-bg);--learn-teal:var(--teal-500);--learn-teal-soft:var(--teal-bg);--learn-amber:var(--amber-500);--learn-amber-soft:var(--amber-bg);--learn-teal-fg:var(--teal-fg);--learn-amber-fg:var(--amber-fg);--learn-teal-wash:#ddf2ea;--learn-amber-wash:#fbf0d2;--learn-glass:var(--surface-raised);--learn-prose-size:18px;--learn-prose-lh:1.75;--learn-heading-weight:600;--learn-dock-h:66px}.learn-root{background:var(--learn-bg);color:var(--learn-text);min-height:100dvh}[data-theme=dark] .learn-root,[data-theme=dark] .learn-tokens{--learn-bg:#15130f;--learn-bg-raised:#201d17;--learn-bg-elevated:#2a251d;--learn-border:var(--border-subtle);--learn-border-strong:var(--border-default);--learn-border-accent:var(--accent-500);--learn-teal-wash:#16332d;--learn-amber-wash:#332811;--learn-text:#f0ebe0;--learn-prose-body:#cdc5b6;--learn-text-secondary:#a8a091;--learn-text-tertiary:#6b6457;--learn-code-bg:#0d0c09;--learn-glass:var(--surface-raised)}.learn-card{background:var(--learn-bg-raised);border:var(--bw) solid var(--learn-border);border-radius:var(--radius-2xl)}.learn-card-elevated{background:var(--learn-bg-elevated);border:var(--bw) solid var(--learn-border);border-radius:var(--radius-2xl)}.learn-btn-accent{background:var(--learn-accent);color:#fff;border-radius:var(--radius-lg);font-weight:600;transition:filter .15s,transform 90ms}.learn-btn-accent:hover{filter:brightness(1.06)}.learn-btn-accent:active{transform:scale(.985)}.learn-btn-accent:disabled{opacity:.4}.learn-btn-ghost{border-radius:var(--radius-lg);color:var(--learn-text-secondary);border:var(--bw) solid var(--learn-border);background:0 0;transition:color .15s,border-color .15s,background .15s}.learn-btn-ghost:hover{color:var(--learn-text);border-color:var(--learn-border-strong);background:var(--learn-bg-raised)}.learn-dock{background:var(--learn-glass);border:var(--bw) solid var(--learn-border);border-radius:var(--radius-3xl);box-shadow:var(--shadow-pop)}.learn-dock-item{color:var(--learn-text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;flex-direction:column;align-items:center;gap:3px;padding:7px 14px 6px;transition:color .18s;display:flex;position:relative}.learn-dock-glyph{border-radius:999px;justify-content:center;align-items:center;width:46px;height:28px;display:flex;position:relative}.learn-dock-indicator{background:var(--learn-accent-soft);border-radius:999px;position:absolute;inset:0}.learn-dock-icon{z-index:1;display:flex;position:relative}.learn-dock-item:hover{color:var(--learn-text)}.learn-dock-item[data-active=true]{color:var(--learn-accent)}.learn-dock-label{letter-spacing:.2px;font-size:10.5px;font-weight:600}@media (max-width:559px){.learn-dock{border-bottom:0;border-left:0;border-right:0;border-top:1px solid var(--learn-border-strong);background:var(--learn-bg);-webkit-backdrop-filter:none;width:100%;padding-bottom:env(safe-area-inset-bottom,0px)}.learn-root{--learn-dock-h:calc(62px + env(safe-area-inset-bottom,0px))}.learn-dock-item{flex:1 1 0;min-width:0;padding:8px 2px 7px}.learn-dock-glyph{width:100%;max-width:56px;height:26px}.learn-dock-label{letter-spacing:0;text-overflow:ellipsis;white-space:nowrap;max-width:100%;font-size:10.5px;overflow:hidden}}.learn-partnav{align-items:stretch;gap:6px;display:flex}.learn-partnav-step{border-radius:var(--radius-lg);border:var(--bw) solid var(--learn-border);background:var(--learn-bg-raised);width:40px;color:var(--learn-text-secondary);flex:none;justify-content:center;align-items:center;transition:color .15s,opacity .15s;display:flex}.learn-partnav-step:hover:not(:disabled){color:var(--learn-text)}.learn-partnav-step:disabled{opacity:.35}.learn-partnav-current{border-radius:var(--radius-lg);border:var(--bw) solid var(--learn-border);background:var(--learn-bg-raised);text-align:left;flex:auto;align-items:center;gap:8px;min-width:0;padding:7px 12px;display:flex}.learn-partnav-current:hover{border-color:var(--learn-border-strong)}.learn-partnav-count{letter-spacing:.4px;text-transform:uppercase;color:var(--learn-accent);font-size:10.5px;font-weight:600;display:block}.learn-partnav-title{text-overflow:ellipsis;white-space:nowrap;color:var(--learn-text);font-size:13px;font-weight:500;display:block;overflow:hidden}.learn-sheet{background:var(--learn-bg);border-top:1px solid var(--learn-border-strong)}.learn-sheet-row{text-align:left;align-items:flex-start;gap:10px;width:100%;padding:10px;transition:background .15s;display:flex}.learn-sheet-row:hover{background:var(--learn-bg-raised)}.learn-sheet-row[data-active=true]{background:var(--learn-accent-soft)}.learn-sheet-index{border-radius:var(--radius-md);background:var(--learn-bg-elevated);width:26px;height:26px;color:var(--learn-text-secondary);flex:none;justify-content:center;align-items:center;font-size:12px;font-weight:600;display:flex}.learn-sheet-row[data-active=true] .learn-sheet-index{background:var(--learn-accent);color:#fff}.learn-chat-composer{--composer-lift:calc(58px + 10px + env(safe-area-inset-bottom,0px));bottom:var(--composer-lift);transition:bottom .24s cubic-bezier(.22,1,.36,1);position:sticky}.learn-root[data-dock=hidden] .learn-chat-composer{--composer-lift:calc(10px + env(safe-area-inset-bottom,0px))}@media (min-width:560px){.learn-chat-composer{--composer-lift:94px}.learn-root[data-dock=hidden] .learn-chat-composer{--composer-lift:14px}}@media (prefers-reduced-motion:reduce){.learn-chat-composer{transition:none}}.learn-chat-prose{--learn-prose-size:14.5px;--learn-prose-lh:1.65}.learn-chat-prose>:last-child{margin-bottom:0}.learn-chat-pulse{background:var(--learn-accent);border-radius:999px;width:7px;height:7px;animation:1.1s ease-in-out infinite learn-chat-pulse;display:inline-block}@keyframes learn-chat-pulse{0%,to{opacity:.35;transform:scale(.85)}50%{opacity:1;transform:scale(1.15)}}@media (prefers-reduced-motion:reduce){.learn-chat-pulse{opacity:.8;animation:none}}.learn-ribbon-track{background:var(--learn-border);height:2px;overflow:hidden}.learn-ribbon-fill{background:var(--learn-accent);height:100%;transition:width .15s ease-out}.learn-topbar{background:var(--learn-glass);border-bottom:var(--bw) solid var(--learn-border)}@media (max-width:559px){.learn-topbar{background:var(--learn-bg);-webkit-backdrop-filter:none}}.learn-prose{font-size:calc(var(--learn-prose-size) * var(--learn-zoom,1));line-height:var(--learn-prose-lh);color:var(--learn-prose-body);overflow-wrap:break-word;text-align:start}.learn-prose pre,.learn-prose .katex{direction:ltr;unicode-bidi:isolate}.learn-prose pre{text-align:left}.learn-prose>:first-child,.learn-prose section>:first-child,.learn-prose .learn-chunk:first-child>:first-child{margin-top:0}.learn-chunk{content-visibility:auto}.learn-chunk>:last-child{margin-bottom:0}.learn-chunk:not(:last-child){margin-bottom:1.15em}.textLayer{opacity:1;text-align:initial;-moz-text-size-adjust:none;text-size-adjust:none;forced-color-adjust:none;transform-origin:0 0;z-index:0;line-height:1;position:absolute;inset:0;overflow:clip}.textLayer :is(span,br){color:#0000;white-space:pre;cursor:text;transform-origin:0 0;position:absolute}.textLayer{--min-font-size:1;--text-scale-factor:calc(var(--total-scale-factor) * var(--min-font-size));--min-font-size-inv:calc(1 / var(--min-font-size))}.textLayer>:not(.markedContent),.textLayer .markedContent span:not(.markedContent){z-index:1;--font-height:0;font-size:calc(var(--text-scale-factor) * var(--font-height));--scale-x:1;--rotate:0deg;--highlight-box:.92;transform:rotate(var(--rotate)) scaleX(var(--scale-x)) scale(var(--min-font-size-inv)) scaleY(var(--highlight-box))}.textLayer .markedContent{display:contents}.textLayer span[role=img]{-webkit-user-select:none;user-select:none;cursor:default}.textLayer .endOfContent{z-index:0;cursor:default;-webkit-user-select:none;user-select:none;display:block;position:absolute;inset:100% 0 0}.textLayer.selecting .endOfContent{top:0}.textLayer ::selection{background:var(--learn-selection);color:#0000}.textLayer ::-moz-selection{background:var(--learn-selection);color:#0000}.learn-prose p{margin-bottom:1.15em}.learn-prose h1,.learn-prose h2,.learn-prose h3,.learn-prose h4{color:var(--learn-text);font-weight:var(--learn-heading-weight);text-wrap:balance;line-height:1.25}.learn-prose h1{letter-spacing:-.02em;margin:0 0 .7em;font-size:1.72em;font-weight:700}.learn-prose h2{letter-spacing:-.012em;border-top:1px solid var(--learn-border);margin:2.2em 0 .85em;padding-top:1.1em;font-size:1.3em;font-weight:650;position:relative}.learn-prose h2:before{content:"";background:var(--learn-accent);width:28px;height:2px;box-shadow:0 0 0 2px var(--learn-accent-glow);position:absolute;top:-1px;left:0}.learn-prose section>h2:first-child{margin-top:.6em}.learn-prose h3{margin:1.8em 0 .55em;font-size:1.06em;font-weight:650}.learn-prose h4{letter-spacing:.07em;text-transform:uppercase;color:var(--learn-text-secondary);margin:1.6em 0 .5em;font-size:.8em;font-weight:700}.learn-prose strong,.learn-prose b{color:var(--learn-text);font-weight:650}.learn-prose em,.learn-prose i{color:var(--learn-text);font-style:italic}.learn-prose mark{background:var(--learn-amber-soft);color:var(--learn-text);padding:0 3px}.learn-prose del{color:var(--learn-text-tertiary)}.learn-prose ul,.learn-prose ol{margin:0 0 1.15em;padding-inline-start:1.5em}.learn-prose ul{list-style:outside}.learn-prose ol{list-style:decimal}.learn-prose ul ul{list-style:circle}.learn-prose li{margin:.35em 0;padding-inline-start:.25em}.learn-prose li::marker{color:var(--learn-accent);font-weight:600}.learn-prose ol>li::marker{color:var(--learn-text-tertiary)}.learn-prose li>ul,.learn-prose li>ol{margin:.35em 0 .4em}.learn-prose li>p{margin-bottom:.5em}.learn-prose li:has(>input[type=checkbox]){margin-left:-1.25em;list-style:none}.learn-prose input[type=checkbox]{accent-color:var(--learn-accent);margin-right:.5em}.learn-prose code{font-family:var(--font-geist-mono), ui-monospace, monospace;border-radius:var(--radius-xs);background:var(--learn-bg-elevated);border:var(--bw) solid var(--learn-border);color:var(--learn-teal);white-space:nowrap;padding:1px 5px;font-size:.86em}.learn-prose pre,.learn-prose .learn-code{border-radius:var(--radius-xl);background:var(--learn-code-bg);border:var(--bw) solid var(--learn-border);margin:1.4em 0;padding:14px 16px;font-size:.8em;line-height:1.65;overflow-x:auto}.learn-prose pre code,.learn-prose .learn-code code{font-size:inherit;color:var(--learn-text);white-space:pre;background:0 0;border:0;padding:0}.learn-prose blockquote{border-radius:0 var(--radius-lg) var(--radius-lg) 0;border-left:3px solid var(--learn-accent);background:var(--learn-bg-raised);color:var(--learn-text-secondary);margin:1.4em 0;padding:.85em 1.1em;font-size:.95em}.learn-prose blockquote p:last-child{margin-bottom:0}.learn-prose .learn-table-scroll{margin:1.4em 0;overflow-x:auto}.learn-prose table{border-collapse:collapse;width:100%;font-size:.85em}.learn-prose th,.learn-prose td{border:var(--bw) solid var(--learn-border);text-align:left;padding:8px 12px}.learn-prose th{background:var(--learn-bg-elevated);color:var(--learn-text);font-weight:600}.learn-prose tbody tr:nth-child(2n) td{background:#00000005}[data-theme=dark] .learn-prose tbody tr:nth-child(2n) td{background:#ffffff05}.learn-prose .katex{color:var(--learn-text)}.learn-prose .katex-html{white-space:normal}.learn-prose .katex .base{white-space:nowrap}.learn-prose .katex{scrollbar-width:none;max-width:100%;display:inline-flex;overflow:auto hidden}.learn-prose .katex::-webkit-scrollbar{display:none}.learn-prose .katex-display>.katex{max-width:none;display:block;overflow:visible}.learn-prose .katex-display{background:var(--learn-bg-raised);border:var(--bw) solid var(--learn-border);margin:1.4em 0;padding:14px 12px;overflow:auto hidden}.learn-prose img{max-width:100%;height:auto;margin:1.4em 0}.learn-prose hr{background:var(--learn-border);border:0;height:1px;margin:2.4em 0}.learn-prose a{color:var(--learn-accent);text-decoration:underline;-webkit-text-decoration-color:var(--learn-border-accent);text-decoration-color:var(--learn-border-accent);text-underline-offset:3px;transition:text-decoration-color .15s}.learn-prose a:hover{-webkit-text-decoration-color:var(--learn-accent);text-decoration-color:var(--learn-accent)}.learn-prose ::selection{background:var(--learn-selection);color:var(--learn-text)}.learn-chip{letter-spacing:.3px;background:var(--learn-accent-soft);color:var(--learn-accent);border:var(--bw) solid var(--learn-border-accent);border-radius:999px;align-items:center;gap:5px;padding:3px 10px;font-size:11px;font-weight:600;display:inline-flex}.learn-chip-neutral{background:var(--learn-bg-elevated);color:var(--learn-text-secondary);border:var(--bw) solid var(--learn-border)}.learn-scroll::-webkit-scrollbar{width:8px}.learn-scroll::-webkit-scrollbar-track{background:0 0}.learn-scroll::-webkit-scrollbar-thumb{background:var(--learn-text-tertiary);background-clip:padding-box;border:2px solid #0000}.learn-scroll::-webkit-scrollbar-thumb:hover{background:var(--learn-accent);background-clip:padding-box}.learn-canvas{touch-action:pan-x pan-y;min-height:100%;position:relative}.learn-canvas[data-doc]{width:max-content;min-width:100%}.learn-zoombar-dock{z-index:30;width:fit-content;height:0;position:sticky;bottom:14px}.learn-zoombar{pointer-events:none;opacity:0;justify-content:center;align-items:flex-end;height:0;transition:opacity .22s;display:flex;position:absolute;bottom:0;left:4px}.learn-zoombar-dock[data-active]{opacity:1;transition:opacity .1s}@media (prefers-reduced-motion:reduce){.learn-zoombar-dock{transition:none}}.learn-zoombar{border:var(--bw) solid var(--learn-border);background:var(--learn-bg-raised);box-shadow:var(--shadow-card);font-variant-numeric:tabular-nums;letter-spacing:.3px;color:var(--learn-text);white-space:nowrap;border-radius:999px;padding:5px 12px;font-size:12px;font-weight:600;transform:translateY(-100%)}.learn-pdf-strip{touch-action:pan-x pan-y;overscroll-behavior-x:contain;width:100%;padding-bottom:3px;overflow:auto hidden}.learn-pdf-strip::-webkit-scrollbar{height:8px}.learn-pdf-strip::-webkit-scrollbar-track{background:0 0}.learn-pdf-strip::-webkit-scrollbar-thumb{background:var(--learn-text-tertiary);background-clip:padding-box;border:2px solid #0000}.learn-viz-render .katex{color:var(--learn-text);scrollbar-width:none;max-width:100%;display:inline-flex;overflow:auto hidden}.learn-viz-render .katex::-webkit-scrollbar{display:none}.learn-viz-render .katex-html{white-space:normal}.learn-viz-render .katex .base{white-space:nowrap}.learn-viz-render .katex-display>.katex{max-width:none;display:block;overflow:visible}.learn-viz-render .katex .mord,.learn-viz-render .katex .mbin,.learn-viz-render .katex .mrel,.learn-viz-render .katex .mopen,.learn-viz-render .katex .mclose,.learn-viz-render .katex .mpunct{color:var(--learn-text)}.learn-viz-render .prose,.learn-viz-render [class*=markdown]{color:var(--learn-text-secondary);font-size:14px;line-height:1.7}.learn-viz-render h1,.learn-viz-render h2,.learn-viz-render h3{color:var(--learn-text)}.learn-viz-render a{color:var(--learn-accent)}.learn-viz-render code{background:var(--learn-bg);color:var(--learn-text)}.learn-viz-render strong{color:var(--learn-text)}.learn-concept-chip{border:1px solid var(--learn-border-strong);color:var(--learn-text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;background:0 0;border-radius:999px;align-items:center;gap:5px;padding:2px 9px;font-size:11.5px;font-weight:500;line-height:1.7;transition:border-color .15s,color .15s,background .15s;display:inline-flex}.learn-concept-chip:hover{border-color:var(--learn-border-accent);color:var(--learn-text)}.learn-concept-chip[data-state=idle]{color:var(--learn-text-tertiary,var(--learn-text-secondary));border-style:dashed}.learn-concept-chip[data-state=generating]{opacity:.7}.learn-concept-chip[data-state=ready]{border-color:var(--learn-accent);color:var(--learn-accent);background:0 0}.learn-concept-chip[data-active=true]{border-color:var(--learn-accent);background:var(--learn-accent);color:#fff;font-weight:600}.learn-concept-tag{background:var(--viz-bg);text-align:left;cursor:pointer;-webkit-user-select:none;user-select:none;border:1px solid #0000;border-radius:999px;align-items:center;gap:6px;max-width:min(100%,340px);padding:3px 10px;transition:border-color .16s,background .16s,box-shadow .16s,transform .16s;display:inline-flex;position:relative;overflow:hidden}.learn-concept-tag-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:8px;display:grid}.learn-concept-tag-grid .learn-concept-tag{width:100%;max-width:none}.learn-concept-tag-glyph{color:var(--viz-fg);flex:none;justify-content:center;align-items:center;display:flex}.learn-concept-tag-label{text-overflow:ellipsis;white-space:nowrap;min-width:0;color:var(--viz-fg);font-size:12px;font-weight:600;line-height:1.6;overflow:hidden}.learn-concept-tag-go{opacity:.6;color:var(--viz-fg);flex:none;margin-left:2px;transition:transform .16s,color .16s}.learn-concept-tag:hover{border-color:var(--viz-ring)}.learn-concept-tag:hover .learn-concept-tag-go{opacity:1;transform:translate(2px)}.learn-concept-tag:active{transform:scale(.99)}.learn-concept-tag[data-state=ready]{border-color:var(--viz-ring)}.learn-concept-tag[data-state=idle]{border-style:dashed;border-color:var(--viz-ring);background:0 0}.learn-concept-tag[data-state=idle][data-error]{border-color:var(--learn-danger,#c0392b)}.learn-concept-tag-badge{letter-spacing:.01em;color:var(--viz-fg);opacity:.75;flex:none;align-items:center;gap:3px;margin-left:2px;font-size:10.5px;font-weight:600;display:inline-flex}.learn-concept-tag[data-state=generating]{opacity:.72}.learn-concept-tag[data-state=generating] .learn-concept-tag-glyph{animation:1.6s ease-in-out infinite learn-tag-pulse}@keyframes learn-tag-pulse{0%,to{opacity:.65}50%{opacity:1}}@media (prefers-reduced-motion:reduce){.learn-concept-tag,.learn-concept-tag-go,.learn-concept-tag-glyph{transition:none;animation:none}}.learn-concept-tag[data-active=true]{border-color:var(--viz-fg);background:var(--viz-bg);box-shadow:0 0 0 1px var(--viz-ring)}.learn-concept-tag[data-active=true]:before{opacity:1}.learn-concept-tag[data-active=true] .learn-concept-tag-go{color:var(--viz-fg)}.learn-chip-anchor{margin:-2px 0 14px;display:block}.learn-sash{cursor:col-resize;background:var(--learn-border);z-index:10;touch-action:none;flex-shrink:0;width:6px;transition:background .15s;position:relative}.learn-sash:after{content:"";position:absolute;inset:0 -8px 0 0}.learn-sash:hover,.learn-sash.dragging{background:var(--learn-accent)}.learn-activity-bar{background:var(--learn-bg);border-left:1px solid var(--learn-border);flex-direction:column;flex-shrink:0;gap:2px;width:48px;padding:8px 0;display:flex}.learn-activity-item{width:48px;height:48px;color:var(--learn-text-tertiary);cursor:pointer;-webkit-user-select:none;user-select:none;justify-content:center;align-items:center;transition:color .15s;display:flex;position:relative}.learn-activity-item:hover{color:var(--learn-text)}.learn-activity-item[data-active=true]{color:var(--learn-accent)}.learn-activity-item[data-active=true]:before{content:"";background:var(--learn-accent);width:2px;height:24px;position:absolute;top:50%;right:0;transform:translateY(-50%)}.learn-activity-tooltip{border-radius:var(--radius-md);background:var(--learn-bg-elevated);border:var(--bw) solid var(--learn-border);white-space:nowrap;color:var(--learn-text);opacity:0;pointer-events:none;z-index:50;margin-right:6px;padding:4px 8px;font-size:11px;font-weight:600;transition:opacity .12s;position:absolute;top:50%;right:100%;transform:translateY(-50%)}.learn-activity-item:hover .learn-activity-tooltip{opacity:1}.learn-credits-flyout{z-index:70;border-radius:var(--radius-2xl);background:var(--learn-bg-elevated);border:var(--bw) solid var(--learn-border);width:17rem;box-shadow:var(--shadow-pop);position:absolute;bottom:8px;right:calc(100% + 6px);overflow:hidden}.learn-mic-anchor{z-index:60;right:20px;bottom:calc(var(--learn-dock-h) + 16px);position:fixed}.learn-mic-anchor.is-left{bottom:24px;left:24px;right:auto}@media (min-width:640px){.learn-mic-anchor{right:24px}}@media (prefers-reduced-motion:reduce){.learn-mic-anchor{transition:none}}.learn-mic-fab{background:var(--learn-accent);cursor:pointer;border-radius:999px;justify-content:center;align-items:center;width:56px;height:56px;animation:3.6s ease-in-out infinite learn-mic-float;display:flex;position:relative;box-shadow:0 8px 24px -6px #17843f59}.learn-mic-fab:hover{filter:brightness(1.06);animation-play-state:paused}.learn-mic-fab:active{transform:scale(.94)}.learn-mic-halo{background:var(--learn-accent);opacity:.35;pointer-events:none;border-radius:999px;animation:2.4s ease-out infinite learn-mic-ripple;position:absolute;inset:0}.learn-mic-halo-delayed{animation-delay:1.2s}.learn-mic-icon{z-index:1;place-items:center;animation:3.6s ease-in-out infinite learn-mic-nudge;display:grid;position:relative}.learn-mic-tip{white-space:nowrap;border-radius:var(--radius-md);color:var(--learn-text);background:var(--learn-bg-elevated);border:var(--bw) solid var(--learn-border);opacity:0;pointer-events:none;padding:6px 10px;font-size:12px;font-weight:600;transition:opacity .16s,transform .16s;position:absolute;left:calc(100% + 10px);transform:translate(-6px)}.learn-mic-fab:hover .learn-mic-tip{opacity:1;transform:translate(0)}@keyframes learn-mic-float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}@keyframes learn-mic-ripple{0%{opacity:.35;transform:scale(1)}70%{opacity:0}to{opacity:0;transform:scale(1.9)}}@keyframes learn-mic-nudge{0%,88%,to{transform:scale(1)}92%{transform:scale(1.14)}96%{transform:scale(.96)}}.learn-mic-fab.is-still,.learn-mic-fab.is-still .learn-mic-icon{animation:none}.learn-mic-fab.is-still{box-shadow:var(--shadow-card)}@media (prefers-reduced-motion:reduce){.learn-mic-fab,.learn-mic-halo,.learn-mic-icon{animation:none}}.learn-page{min-height:100dvh}.learn-page-content{overflow:visible}html[data-touch-select=custom] .learn-page-content,html[data-touch-select=custom] .learn-split-reader{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}.learn-sel-handle{z-index:64;background:var(--learn-accent);touch-action:none;-webkit-tap-highlight-color:transparent;border-radius:999px;width:15px;height:15px;transition:transform .12s;position:fixed;transform:translateY(1px);box-shadow:0 1px 4px #00000040}.learn-sel-handle[data-edge=start]{margin-left:-17px}.learn-sel-handle[data-edge=end]{margin-left:2px}.learn-sel-handle:before{content:"";position:absolute;inset:-14px}.learn-sel-handle[data-dragging=true]{transform:translateY(1px)scale(1.3)}.learn-sel-anchor{z-index:66;position:fixed}.learn-sel-menu{border:var(--bw) solid var(--learn-border);border-radius:var(--radius-xl);background:var(--learn-bg-elevated);box-shadow:var(--shadow-pop);align-items:stretch;display:flex;overflow:hidden}.learn-sel-action{color:var(--learn-text);white-space:nowrap;cursor:pointer;-webkit-tap-highlight-color:transparent;align-items:center;gap:7px;padding:10px 16px;font-size:13.5px;font-weight:600;transition:background .14s;display:inline-flex}.learn-sel-action:first-child{color:var(--learn-accent)}.learn-sel-action:active,.learn-sel-action:hover{background:var(--learn-bg-raised)}.learn-sel-divider{background:var(--learn-border);width:1px}.learn-sel-action.is-icon{padding:10px 13px}.learn-annot-popover{z-index:68;border:var(--bw) solid var(--learn-border);border-radius:var(--radius-xl);background:var(--learn-bg-elevated);box-shadow:var(--shadow-pop);overscroll-behavior:contain;flex-direction:column;gap:8px;padding:10px;display:flex;position:fixed;overflow:hidden auto}.learn-annot-popover[data-centred]{box-shadow:var(--shadow-pop);gap:10px;padding:14px}.learn-annot-popover[data-centred] .learn-annot-textarea{min-height:108px;font-size:15px}.learn-annot-scrim{z-index:67;background:#0000008c;position:fixed;inset:0}.learn-annot-colors{align-items:center;gap:6px;display:flex}.learn-annot-swatch{cursor:pointer;border:2px solid #0000;border-radius:999px;width:18px;height:18px;transition:transform .12s}.learn-annot-swatch:hover{transform:scale(1.12)}.learn-annot-swatch[data-active=true]{border-color:var(--learn-text)}.learn-annot-swatch[data-color=yellow]{background:#facc15d9}.learn-annot-swatch[data-color=green]{background:#34d399d9}.learn-annot-swatch[data-color=blue]{background:#60a5fad9}.learn-annot-swatch[data-color=pink]{background:#f472b6d9}.learn-annot-swatch[data-color=purple]{background:#a78bfad9}.learn-annot-icon{width:26px;height:26px;color:var(--learn-text-secondary);cursor:pointer;justify-content:center;align-items:center;transition:background .14s,color .14s;display:inline-flex}.learn-annot-icon:hover{background:var(--learn-bg-raised);color:var(--learn-text)}.learn-annot-danger:hover{color:#e5484d}.learn-annot-editor{flex-direction:column;gap:6px;display:flex}.learn-annot-textarea{resize:vertical;border-radius:var(--radius-lg);border:var(--bw) solid var(--learn-border);background:var(--learn-bg);width:100%;color:var(--learn-text);outline:none;padding:8px 10px;font-size:13px;line-height:1.5}.learn-annot-textarea:focus{border-color:var(--learn-border-accent,var(--learn-accent))}.learn-annot-btn{border-radius:var(--radius-md);border:var(--bw) solid var(--learn-border);color:var(--learn-text-secondary);cursor:pointer;align-items:center;gap:5px;padding:5px 10px;font-size:12px;font-weight:600;transition:background .14s,color .14s;display:inline-flex}.learn-annot-btn:hover{background:var(--learn-bg-raised);color:var(--learn-text)}.learn-annot-btn.is-primary{background:var(--learn-accent);color:#fff;border-color:#0000}.learn-annot-btn.is-primary:hover{background:var(--learn-accent);color:#fff;filter:brightness(1.06)}.learn-annot-note{border-left:2px solid var(--learn-accent);color:var(--learn-text-secondary);white-space:pre-wrap;padding-left:8px;font-size:13px;line-height:1.5}.learn-notes-btn{width:36px;height:36px;color:var(--learn-text-secondary);flex-shrink:0;justify-content:center;align-items:center;transition:background .14s,color .14s;display:inline-flex;position:relative}.learn-notes-btn.is-compact{width:40px;height:40px}.learn-notes-btn:hover,.learn-notes-btn[data-active=true]{background:var(--learn-bg-raised);color:var(--learn-text)}.learn-notes-count{background:var(--learn-accent);color:#fff;border-radius:999px;min-width:15px;padding:0 3px;font-size:9.5px;font-weight:600;line-height:15px;position:absolute;top:2px;right:1px}.learn-notes-scrim{z-index:69;background:#00000052;position:fixed;inset:0}.learn-notes-drawer{z-index:70;border-left:1px solid var(--learn-border);background:var(--learn-bg-raised);width:min(400px,100vw);height:100dvh;box-shadow:var(--shadow-pop);padding-top:env(safe-area-inset-top);flex-direction:column;display:flex;position:fixed;top:0;right:0}.learn-notes-head{border-bottom:1px solid var(--learn-border);align-items:center;gap:8px;padding:12px 14px;display:flex}.learn-notes-filter{gap:6px;padding:10px 14px 4px;display:flex}.learn-notes-filter button{border:var(--bw) solid var(--learn-border);color:var(--learn-text-tertiary);cursor:pointer;border-radius:999px;padding:4px 12px;font-size:12px;font-weight:600;transition:background .14s,color .14s}.learn-notes-filter button[data-active=true]{background:var(--learn-accent);color:#fff;border-color:#0000}.learn-notes-all{color:var(--learn-accent);white-space:nowrap;border-radius:999px;align-items:center;gap:4px;margin-left:auto;padding:4px 10px;font-size:12px;font-weight:600;transition:background .14s;display:inline-flex}.learn-notes-all:hover{background:var(--learn-accent-soft)}.learn-notes-group{letter-spacing:.06em;text-transform:uppercase;color:var(--learn-text-tertiary);padding:6px 2px 8px;font-size:10.5px;font-weight:500}.learn-note-card{border-radius:var(--radius-lg);border:var(--bw) solid var(--learn-border);background:var(--learn-bg);border-left-width:3px;padding:10px 12px}.learn-note-card[data-color=yellow]{border-left-color:#facc15d9}.learn-note-card[data-color=green]{border-left-color:#34d399d9}.learn-note-card[data-color=blue]{border-left-color:#60a5fad9}.learn-note-card[data-color=pink]{border-left-color:#f472b6d9}.learn-note-card[data-color=purple]{border-left-color:#a78bfad9}.learn-note-quote{text-align:left;width:100%;color:var(--learn-text);cursor:pointer;-webkit-line-clamp:4;-webkit-box-orient:vertical;font-size:13px;line-height:1.55;display:-webkit-box;overflow:hidden}.learn-note-quote:hover{color:var(--learn-accent)}.learn-note-quote.is-static,.learn-note-quote.is-static:hover{cursor:default;color:var(--learn-text-secondary)}.learn-note-text{border-left:2px solid var(--learn-border-strong);color:var(--learn-text-secondary);white-space:pre-wrap;margin-top:6px;padding-left:8px;font-size:12.5px;line-height:1.5}.learn-part-action{width:32px;height:32px;color:var(--learn-accent);cursor:pointer;justify-content:center;align-items:center;transition:opacity .14s,background .14s;display:inline-flex;position:absolute;top:8px;right:8px}.learn-part-action:before{content:"";position:absolute;inset:-6px}.learn-part-action:hover{background:var(--learn-accent-soft)}@media (hover:hover) and (pointer:fine){.learn-part-action{opacity:0}.learn-card:hover .learn-part-action,.learn-card:focus-within .learn-part-action,.learn-part-action:focus-visible,.learn-part-action[data-open]{opacity:1}}.tutor-boot-orb{place-items:center;width:96px;height:96px;display:grid;position:relative}.tutor-boot-ring{border:var(--bw) solid var(--accent-500);opacity:0;border-radius:999px;animation:2.8s cubic-bezier(.2,.6,.3,1) infinite tutor-boot-pulse;position:absolute;inset:0}.tutor-boot-ring-2{animation-delay:1.4s}.tutor-boot-dot{animation:1.4s ease-in-out infinite tutor-boot-blink}@keyframes tutor-boot-pulse{0%{opacity:0;transform:scale(.55)}25%{opacity:.55}to{opacity:0;transform:scale(1.05)}}@keyframes tutor-boot-blink{0%,to{opacity:1}50%{opacity:.25}}.tutor-aura{border-radius:inherit;pointer-events:none;box-shadow:inset 0 0 0 2px var(--tutor-aura-tint,var(--accent-500));opacity:calc(var(--tutor-voice,0) * .5);transition:box-shadow .2s;position:absolute;inset:0}@media (prefers-reduced-motion:reduce){.tutor-boot-ring,.tutor-boot-dot{animation:none}.tutor-boot-ring{opacity:.3}}.sel-loupe{z-index:70;border-radius:var(--radius-xl);border:var(--bw) solid var(--learn-border);background:var(--learn-bg);width:156px;height:56px;box-shadow:var(--shadow-pop);opacity:0;pointer-events:none;will-change:transform;position:fixed;top:0;left:0;overflow:hidden}.sel-loupe-scene{transform-origin:0 0;will-change:transform;position:absolute;top:0;left:0}.sel-loupe-scene *{pointer-events:none!important;transition:none!important;animation:none!important}.sel-loupe-mark{background:var(--accent-300,#cfe3d0);mix-blend-mode:multiply;position:absolute;top:0;left:0}