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.prototype.theme-night{--ink:#d6e2e2;--ink-strong:#edf1ee;--mist:#0b202a;--paper:#102f3b;--paper-alt:#16313d;--line:rgba(213,225,224,.18);--muted:#a6b8bc;--gold:#d5b656;--article:#edf1ee}.study-experience:not(.theme-night),.study-experience:not(.theme-night) .prototype{--paper:#faf8f2;--paper-alt:#f1f3ef;--muted:#596d74;--article:#17313b}.study-experience:not(.theme-night) .study-hub{--study-muted:#596d74;background:var(--mist)}.study-experience .subject-menu button span{color:inherit;font:inherit}.study-experience .subject-menu button:not([aria-current]):not(:hover):not(:focus-visible){color:var(--ink)}.study-experience .workspace-heading h1{color:var(--ink)}.study-experience .study-question-meta b{color:#785f20;background:#eee7d4;border:1px solid rgba(150,122,51,.15);padding:5px 9px}.study-experience.theme-night .study-question-meta b{background:#294957;color:#e2c46b;border-color:#425d65}.study-experience .study-hub :where(.study-question,.study-options button,.study-desk-toolbar,.study-source,.study-admin,.study-stats article,.study-errors article){background:var(--paper)}.study-experience .study-hub :where(.study-filters,.study-question-footer){background:var(--paper-alt)}.study-experience .study-hub :where(.study-filters select,.study-filters input){background:var(--paper);color:var(--ink)}.study-experience .study-desk .study-options button:hover:not(:disabled):not(.chosen){background:var(--paper-alt);color:var(--ink);border-color:#81969c}.study-experience .study-desk .study-options button.chosen{background:#e4ece8;color:#173846;border-color:#527a83}.study-experience.theme-night .study-desk .study-options button.chosen{background:#294957;color:#edf1ee;border-color:#a0b4b8}.study-experience .study-desk .study-options button.correct{background:#e3eee6;color:#245441;border-color:#779c87}.study-experience .study-desk .study-options button.incorrect{background:#f4e7e1;color:#814b3c;border-color:#bd9284}.study-experience.theme-night .study-desk .study-options button.correct{background:#183e34;color:#c5e2d1;border-color:#5f9079}.study-experience.theme-night .study-desk .study-options button.incorrect{background:#442f2d;color:#ecd3ce;border-color:#a47970}.study-experience .study-desk .study-options button:disabled{opacity:1;cursor:default}.study-experience ::-webkit-scrollbar-button{display:none;height:0;width:0}.study-experience .study-hub .study-primary:hover:not(:disabled),.study-experience .flash-hub .flash-primary:hover:not(:disabled){background:#1a3d4b;color:#fff;border-color:#1a3d4b}.study-experience.theme-night .study-hub .study-primary:hover:not(:disabled),.study-experience.theme-night .flash-hub .flash-primary:hover:not(:disabled){background:#e4c975;color:#102f3b;border-color:#e4c975}.study-experience .flash-subjects button:not(.active):hover{color:var(--ink);background:var(--paper-alt);border-color:#81969c}.study-experience .flash-back{background:var(--paper-alt);color:var(--ink)}.study-assisted-note{margin-left:auto;font-size:10px;color:var(--muted)}.study-experience .question-navigation{display:flex;flex:0 0 auto;justify-content:center;align-items:center;gap:0;padding:12px 20px 0;margin:0}.study-experience .question-navigation button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-width:112px;min-height:42px;padding:9px 14px;background:var(--paper);color:var(--ink);border:1px solid var(--line);border-radius:0;font-size:12px}.study-experience .question-navigation button:hover:not(:disabled){background:var(--paper-alt);border-color:var(--gold)}.question-navigation>span{min-width:94px;min-height:42px;display:flex;align-items:center;justify-content:center;gap:8px;border-block:1px solid var(--line);background:var(--paper);color:var(--muted);font:12px DM Mono,monospace}.question-navigation i{font-style:normal;opacity:.5}.study-experience .study-actions{flex-wrap:wrap}.study-experience .explain-action{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:38px;padding:8px 13px;border:1px solid var(--gold);border-radius:0;color:var(--ink);background:var(--paper);font-size:12px;cursor:pointer}.reading-explain-action{margin-top:14px}.flash-navigation{padding-bottom:16px!important}.flash-answer-pane{min-width:0}.flash-answer-pane>.flash-hint{display:block;margin:14px 0}.study-experience .prototype.focus-mode{position:fixed;top:0;right:0;bottom:0;left:0;z-index:var(--studio-layer-immersive);padding:0}.study-experience .focus-mode .app-shell{margin:0;grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr);height:100dvh;width:100%}.study-experience .focus-mode .workspace{grid-column:1;grid-row:1;grid-template-rows:minmax(0,1fr)}.study-experience .focus-mode .reader{display:flex;flex-direction:column;min-height:0;height:100%;overflow:hidden;overflow-anchor:none;padding:20px clamp(22px,3vw,48px) 14px}.focus-mode .reader>.article-head,.focus-mode .reader>.reading-toolbar{flex:0 0 auto}.study-experience .focus-mode .reading-toolbar{max-height:none}.focus-mode .article-head{padding-bottom:14px}.focus-mode .article-head h1{font-size:clamp(26px,3vw,44px)}.focus-mode .reader>.study-split{display:grid;flex:1 1 0;min-height:0;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:24px}.focus-mode .reader :is(.reading-column,.question-column){min-width:0;min-height:0;height:100%;overflow:auto;overflow-anchor:none;padding-top:20px}.focus-mode .reader .reading-column{padding-right:24px}.reader.chrome-hidden .reading-toolbar{max-height:none;min-height:44px;opacity:1;transform:none;pointer-events:auto;border-color:var(--line)}.reader .reading-toolbar{position:sticky;top:0;z-index:3;background:var(--paper)}.focus-mode .reader>.annotation-sync-error{flex:0 0 auto}.study-experience .theme-night .reading-toolbar .study-focus{color:#102f3b}.study-immersed,.flash-immersed{position:fixed;top:0;right:0;bottom:0;left:0;z-index:var(--studio-layer-immersive);height:100dvh;padding:0!important}.study-experience .study-immersed .study-layout,.study-experience .flash-immersed .flash-shell{display:grid;width:100%;height:100dvh;margin:0;border:0;grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr)}:is(.study-immersed,.flash-immersed) .workspace-rail{display:none}.study-experience .study-immersed .study-content,.flash-immersed .flash-workspace{grid-column:1;grid-row:1;min-height:0}.study-immersed .study-filters{display:none}.study-experience .study-immersed .study-question-body{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr)}.study-experience .study-immersed .study-prompt-pane{white-space:pre-wrap;overflow:auto;min-height:0;padding:22px 28px;border-right:1px solid var(--line);color:var(--ink)}.study-immersed .study-prompt-pane p{margin:0 0 22px}.study-experience .study-immersed .study-prompt-pane h2{margin:0}.study-immersed .study-question-scroll{padding-top:22px}.study-experience .flash-immersed .flash-content{display:flex;flex-direction:column;overflow:hidden;padding:12px 24px 20px}.flash-immersed .flash-content>.flash-step{display:none}.flash-immersed .flash-card{display:flex;flex:1;flex-direction:column;min-height:0;width:100%;max-width:none;margin:0;padding:20px 28px}.flash-immersed .flash-card>.flash-step-label{display:none}.flash-immersed .flash-card-layout{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:28px;flex:1;min-height:0;padding-top:14px}.flash-immersed .flash-card-layout>:is(.flash-front,.flash-answer-pane){min-height:0;overflow:auto}.flash-immersed .flash-front{padding:10px 28px 20px 0;border-right:1px solid var(--line)}.flash-immersed .flash-back{margin-top:0}.flash-immersed .flash-answer-pane{padding:10px 0 20px}.answer-book{position:fixed;top:0;right:0;bottom:0;left:0;margin:auto;display:none;flex-direction:column;width:min(720px,calc(100% - 32px));height:min(760px,calc(100dvh - 48px));max-height:calc(100dvh - 32px);padding:0;border:1px solid var(--gold);border-top:3px solid var(--gold);color:var(--ink);background:var(--paper);box-shadow:0 30px 100px #0f242c47}.answer-book[open]{display:flex;animation:studio-arrive .24s var(--studio-ease)}.answer-book::backdrop{background:#0a1d2561;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.answer-book header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px 30px 20px;border-bottom:1px solid var(--line)}.answer-book-eyebrow{font:10px DM Mono,monospace;letter-spacing:.1em;color:var(--muted)}.answer-book h2{margin:10px 0 0;font:600 24px Libre Caslon Text,Noto Sans SC,serif;color:var(--ink)}.answer-book-body{flex:1;min-height:0;overflow:auto;overscroll-behavior:contain;padding:26px 34px 36px;background-image:linear-gradient(transparent 31px,#7d887a09 32px);background-size:100% 32px}.answer-book-text{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:2.05}.answer-book-text p{margin:0;min-height:1em}.answer-book-text h3{margin:20px 0 8px;font-size:16px;font-weight:600;color:var(--ink)}.answer-book-text h3:first-child{margin-top:0}.ink-reveal{animation:studio-ink .36s ease-out}.ink-cursor{display:inline-block;width:6px;height:13px;background:var(--gold);animation:studio-ink .8s ease-in-out infinite alternate}.answer-book-result h3{margin:20px 0 10px;font-size:16px}.answer-book-result p{white-space:pre-wrap;font-size:14px;line-height:2}.answer-book button:not(.icon-action){display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:38px;padding:8px 12px;color:var(--ink);background:var(--paper);border:1px solid var(--line);font-size:12px;cursor:pointer}.answer-book footer{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 24px;border-top:1px solid var(--line);background:var(--paper-alt)}.answer-book footer>span{color:var(--muted);font-size:11px}.answer-book footer>div{display:flex;gap:8px}.answer-book-wait{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:13px}.answer-book-wait i{width:7px;height:7px;background:var(--gold);animation:studio-ink .7s infinite alternate}.answer-book-error{color:#965846;border-left:2px solid #965846;padding:12px;font-size:12px;line-height:1.8}.theme-night .answer-book-error{color:#e3b3a5}@media(max-width:850px){.focus-mode .reader>.study-split{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1.15fr) minmax(0,1fr);gap:12px}.focus-mode .reader .reading-column{padding-right:0;border-right:0;border-bottom:1px solid var(--line)}.study-experience .study-immersed .study-question-body{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,.9fr) minmax(0,1.1fr)}.study-experience .study-immersed .study-prompt-pane{border-right:0;border-bottom:1px solid var(--line);padding:16px 20px}.flash-immersed .flash-card-layout{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr) minmax(0,1fr);gap:12px}.flash-immersed .flash-front{border-right:0;border-bottom:1px solid var(--line);padding:8px 0 16px}}@media(max-width:760px){.study-experience .question-navigation{padding:10px 12px 0}.study-experience .question-navigation button{min-width:94px;font-size:11px}.question-navigation>span{min-width:76px;font-size:11px}.study-experience .focus-mode .reader{padding:14px 18px 8px}.focus-mode .article-head h1{font-size:25px}.focus-mode .reading-toolbar{flex-wrap:wrap;gap:8px}.study-experience .flash-immersed .flash-content{padding:8px 12px 12px}.flash-immersed .flash-card{padding:16px}.answer-book{width:calc(100% - 20px);height:calc(100dvh - 24px)}.answer-book header{padding:18px 20px}.answer-book-body{padding:22px}.answer-book footer{padding:12px 16px;flex-wrap:wrap}.study-experience .study-actions{gap:6px;padding-inline:12px}.study-experience .study-actions button{padding-inline:10px;min-height:38px}}@media(prefers-reduced-motion:reduce){.study-experience *,.studio-loading-line:after{animation:none!important;transition:none!important}}