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var(--line);margin-top:75px;padding:45px 0 18px;background:var(--surface)}.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:40px}.footer-grid p{font-size:14px;margin:16px 0;color:var(--muted)}.footer-grid small{font-size:10px;color:var(--muted)}.footer-grid>div>b{display:block;font-size:12px;margin-bottom:16px}.footer-grid>div>a:not(.brand){display:block;font-size:11px;color:var(--muted);margin:10px 0}.footer-grid .text-button{font-size:11px;color:var(--muted);padding:0}.footer-bottom{margin-top:35px;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;font-size:10px;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:17px;background:var(--surface);color:var(--ink);padding:28px;width:min(450px,calc(100vw - 32px));box-shadow:0 20px 70px #153c2b25}dialog::backdrop{background:#14382b66;backdrop-filter:blur(3px)}.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}.dialog-head h2{margin:0;font-size:24px}dialog p{font-size:14px;color:var(--muted);white-space:pre-line}.toast{position:fixed;bottom:23px;left:50%;transform:translateX(-50%);max-width:calc(100% - 30px);background:var(--green);color:white;border-radius:9px;padding:13px 20px;font-size:12px;z-index:100;box-shadow:0 8px 30px #173a2825}.consent{position:fixed;bottom:16px;left:16px;right:16px;background:var(--surface);border:1px solid var(--line);box-shadow:0 10px 50px #183a2829;border-radius:13px;padding:19px 23px;display:flex;gap:22px;align-items:center;z-index:80}.consent b{font-size:13px}.consent p{font-size:11px;color:var(--muted);margin:5px 0 0}.consent>div{flex:1}.consent .button{white-space:nowrap}.photo-label{display:inline-block;cursor:pointer;padding:10px 15px;border:1px solid var(--line);border-radius:7px;margin-top:17px}.saved-pill{background:var(--soft);padding:3px 8px;border-radius:4px;font-size:10px}.notebook-row{display:flex;gap:9px;align-items:center;margin:15px 0;font-size:12px}.loading-note{padding:20px;color:var(--muted);font-size:13px}.symbol-bar{display:flex;gap:6px;flex-wrap:wrap;margin:13px 0}.symbol-bar button{width:32px;height:29px;border:1px solid var(--line);background:var(--bg);border-radius:5px;color:var(--ink)}.source-details{border-top:1px solid var(--line);padding-top:16px;margin-top:20px;font-size:11px;color:var(--muted)}.source-details summary{cursor:pointer}.review-actions{display:flex;justify-content:space-between;gap:15px;margin:28px 0}.inline-status{font-size:12px;color:var(--muted)}
html[data-theme=dark]{--ink:#e0e9de;--muted:#a4b4a7;--green:#a9c696;--green-hover:#bdd5aa;--soft:#283d30;--bg:#17251e;--surface:#1e3025;--line:#354a39;--red:#f0aba0;color-scheme:dark}.button{box-shadow:none}html[data-theme=dark] .button:not(.secondary){color:#17251e}html[data-theme=dark] .brand img{filter:brightness(0) invert(.9)}html[data-theme=dark] .hero-study:before{background:#2b3d2a;border-color:#43583b}html[data-theme=dark] .source-crop img{opacity:.65}html[data-theme=dark] .option.correct{background:#2a4531}html[data-theme=dark] .option.incorrect{background:#4d302a}html[data-theme=dark] .pending-card{background:#3b3825;color:#e3dbb8}html[data-theme=dark] .preview-bar{background:#4c452b;color:#e6ddc0}
@media(max-width:1050px){.header-inner{gap:25px}.site-header nav{gap:17px}.header-actions{gap:10px}.hero{gap:42px}.exam-grid{grid-template-columns:1fr 1fr}.hero-study{padding:22px}.hero .actions{gap:9px}.hero .button{padding:13px 17px}.hero-proof{gap:10px;font-size:9px}.paper-layout{gap:32px}.practice-layout{gap:28px;grid-template-columns:minmax(0,1fr) 245px}.auth-layout{gap:45px}.study-banner{gap:35px}.plan-card{padding:25px}.plan-price{font-size:32px}.site-header .app-link{display:none}}
@media(max-width:760px){.container{width:calc(100% - 36px)}.header-inner{min-height:70px;gap:12px;justify-content:space-between}.brand img{width:111px}.site-header nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--line);padding:20px;flex-wrap:wrap}.site-header nav.open{display:flex}.header-actions{gap:9px}.header-actions>.button{min-height:36px;padding:8px 12px;font-size:11px}.icon-button{width:35px;height:35px;font-size:19px}.mobile-menu{display:grid}.hero{grid-template-columns:1fr;padding:43px 0 38px;gap:34px}.hero h1{font-size:45px}.hero-description{font-size:15px;line-height:1.7}.hero .actions .button{font-size:12px;padding:13px 18px}.hero-study{max-width:560px;transform:none;padding:22px;margin-right:8px}.hero-study:before{inset:10px -8px -8px 10px}.hero-proof{font-size:10px;gap:12px}.study-top{font-size:8px}.small-label{font-size:8px}.stat-strip{grid-template-columns:1fr 1fr;padding:10px 0}.stat-strip>div{padding:16px 20px}.stat-strip>div:nth-child(2){border:0}.stat-strip>div:nth-child(n+3){border-top:1px solid var(--line)}.stat-strip b{font-size:23px}.section{padding-top:43px}.section-heading{align-items:start;gap:15px;flex-wrap:wrap}.section-heading h2{font-size:27px}.section-heading>.text-link{font-size:11px}.exam-grid{gap:11px}.exam-card{padding:18px 13px;gap:11px;align-items:start}.exam-card .exam-monogram{display:none}.exam-card strong{font-size:14px}.exam-card small{font-size:10px}.exam-card .arrow{font-size:17px}.paper-grid{grid-template-columns:1fr 1fr;gap:12px}.paper-card{padding:18px}.paper-card h3{font-size:17px}.card-bottom{flex-wrap:wrap;gap:10px}.study-banner{grid-template-columns:1fr;padding:28px 23px;margin:45px 0;gap:35px}.study-banner h2{font-size:28px}.page-heading{padding:35px 0 28px}.page-heading 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13px;flex:1}.reader-heading{align-items:start;flex-wrap:wrap}.reader-heading h1{font-size:25px}.reader-panel{padding:12px}.reader-panel iframe{height:65vh}.editorial h1{font-size:41px}.preview-bar{font-size:8px;letter-spacing:.7px}.preview-bar span{margin-left:6px}.question-preview{padding:21px}.source-details{font-size:10px}.review-item{padding:20px}.review-actions{flex-wrap:wrap}.hero-study>p{font-size:13px}}
@media(max-width:420px){.paper-grid{grid-template-columns:1fr}.hero h1{font-size:40px}.hero-proof{gap:8px;font-size:9px}.form-grid{grid-template-columns:1fr}.map-grid{grid-template-columns:repeat(8,1fr)}.result-summary{grid-template-columns:1fr 1fr}.result-summary>.metric:last-child{grid-column:1/-1}.header-actions .icon-button{width:31px}.header-actions{gap:6px}.hero .actions{gap:8px}.hero .actions .button{padding:12px 14px;font-size:11px}.session-top .session-tools{width:100%;justify-content:space-between}.metadata{grid-template-columns:1fr 1fr}.exam-card small{font-size:9px}}
.map-grid{max-height:390px;overflow:auto;padding:3px}.katex-display{overflow-x:auto;overflow-y:hidden;padding:6px 0}.katex{font-size:1.06em}.preview-reset{border:0;background:transparent;text-decoration:underline;color:inherit;font-size:10px;margin-left:18px}.source-crop .loading-note{display:block;font-size:11px}.actions.centered{justify-content:center}
.paper-post{max-width:1080px;margin:auto}.paper-post .page-heading{max-width:860px}.paper-post .reading-panel{max-width:820px}.inline-practice{scroll-margin-top:105px;padding:40px 0;border-top:1px solid var(--line);margin-top:35px}.inline-practice>p{max-width:800px;font-size:14px;line-height:1.8}.inline-practice .session-top h2{font-size:25px;margin:0}.share-actions{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin:25px 0}.share-actions button{border:0;background:transparent;color:var(--green);padding:5px 0;font-size:13px;cursor:pointer;text-decoration:underline;text-underline-offset:4px}.share-actions a{font-size:13px}.map-grid button.locked{background:var(--bg);color:var(--muted);border:1px dashed var(--line)}.map-grid button.locked span{margin-left:2px}.map-grid button.current{outline:2px solid var(--green)}.static-question-map{margin:25px 0}.static-question-map ol{display:flex;list-style:none;flex-wrap:wrap;gap:8px;padding:0}.static-question-map a{display:block;border:1px solid var(--line);padding:8px 12px;border-radius:7px;font-size:12px}.static-question-map a.locked{color:var(--muted);background:var(--bg)}.suggestion{display:block;font-size:11px;color:var(--green);margin-top:5px}.social-toolbar{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:25px}.social-toolbar p{font-size:13px;max-width:650px}.social-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);gap:22px;align-items:start}.social-grid .panel{margin-bottom:20px;padding:24px}.social-grid h2{font-size:22px}.social-grid h3{font-size:17px}.social-grid input,.social-grid textarea{min-width:0;max-width:100%}.social-grid form{display:grid;gap:14px}.friend-card{padding:17px 0;border-bottom:1px solid var(--line)}.friend-card>div:first-child{display:flex;align-items:center;gap:12px;margin-bottom:12px}.presence{font-size:11px;color:var(--muted)}.presence.online:before{content:'●';color:var(--green);margin-right:5px}.friend-match{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:15px}.room-card{display:flex;align-items:center;gap:8px;flex-wrap:wrap;width:100%;padding:15px;margin:12px 0;text-align:left;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:10px;cursor:pointer}.room-card span{margin-left:auto;font-size:12px}.invite-card,.shared-room{padding:20px 0;border-top:1px solid var(--line);margin-top:18px}.shared-room .option{font-size:13px}.friends-dialog{width:min(1180px,calc(100vw - 32px));max-width:none;max-height:92vh;overflow:auto;padding:28px}.friends-dialog .dialog-head{position:sticky;top:-28px;background:var(--surface);z-index:4;padding-top:10px}.safety-number{font-family:monospace;font-size:12px;overflow-wrap:anywhere;line-height:1.9}.chat-thread details{font-size:12px;margin-bottom:20px}.chat-messages{max-height:440px;overflow:auto;overscroll-behavior:contain;padding:8px;background:var(--bg);border-radius:12px;margin:18px 0}.chat-bubble{width:88%;padding:12px 15px;margin:10px 0;background:var(--surface);border:1px solid var(--line);border-radius:14px 14px 14px 3px;overflow-wrap:anywhere}.chat-bubble.own{margin-left:auto;background:var(--soft);border-radius:14px 14px 3px 14px}.chat-bubble p{margin:0 0 8px;white-space:pre-wrap;font-size:14px}.chat-bubble small{font-size:9px;color:var(--muted)}.chat-bubble .text-button{font-size:10px;margin:8px 10px 0 0}.chat-removed{font-size:11px;color:var(--muted);font-style:italic;padding:5px 10px}.chat-attachment{max-width:100%;max-height:360px;display:block;margin:10px 0}.backup-settings{margin-top:25px;border-top:1px solid var(--line);padding-top:18px}.backup-settings label{margin:16px 0}.app-preference{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;padding:15px 20px;margin:30px 0;background:var(--soft);border:1px solid var(--line);border-radius:12px;font-size:12px}.app-preference p{margin:0}.paper-preview{max-width:820px}.paper-preview .question-preview{margin-bottom:20px}.inline-practice .session-tools{flex-wrap:wrap}.friends-dialog .actions{gap:8px}
@media(max-width:900px){.social-grid{grid-template-columns:1fr}.friends-dialog{padding:20px}.friends-dialog .dialog-head{top:-20px}.inline-practice{scroll-margin-top:75px}.paper-post .page-heading h1{font-size:35px}.social-grid .panel{padding:20px}.friend-card .actions .button{font-size:11px;padding:9px 12px}.chat-bubble{width:92%}.social-grid .row-between{gap:12px;flex-wrap:wrap}.inline-practice .session-tools{width:100%;gap:8px;justify-content:start}.inline-practice .session-tools .button{padding:9px 10px;font-size:11px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}@media print{.site-header,.footer,.preview-bar,.session-tools,.consent,.question-map,.toast{display:none!important}.container{width:100%}.paper-access{position:static}.source-crop img{opacity:1!important}a{color:inherit}}

.footer{padding:0;margin-top:65px;border-top:1px solid var(--line)}.footer-simple{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:25px 0}.footer-simple small{font-size:12px;color:var(--muted)}.footer-simple nav{display:flex;gap:22px;align-items:center}.footer-simple a{font-size:12px;color:var(--muted)}.footer-simple a:hover{color:var(--green)}@media(max-width:600px){.footer{margin-top:40px}.footer-simple{padding:22px 0;gap:16px;flex-wrap:wrap}.footer-simple nav{gap:20px}.footer-simple small,.footer-simple a{font-size:11px}}

/* Stable paper-page layout: heading, resource facts, practice, source details, related material. */
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var(--line);border-radius:12px;padding:8px;background:var(--surface);box-shadow:var(--shadow);z-index:12}.share-menu a,.share-menu button{display:block;width:100%;padding:10px 12px;text-align:left;font-size:12px;border:0;border-radius:6px;background:none;color:var(--ink)}.share-menu a:hover,.share-menu button:hover{background:var(--soft)}.paper-facts{display:grid;grid-template-columns:.65fr 1fr 1fr 1.3fr;gap:20px;margin:0;padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.paper-facts dt{font-size:10px;font-weight:650;text-transform:uppercase;letter-spacing:1px;color:var(--muted);margin-bottom:6px}.paper-facts dd{margin:0;font-size:12px;font-weight:550}.paper-introduction{max-width:810px;padding:24px 0 0;color:var(--muted);font-size:14px}.inline-practice{padding:27px 0 30px;border-top:0;margin-top:0}.practice-section-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin:0 0 12px}.practice-section-heading 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.check-label{margin-top:18px}.setup-submit{display:flex;align-items:center;gap:18px;margin-top:21px}.setup-submit>span{font-size:11px;color:var(--muted)}.paper-excerpt{max-width:850px;margin-top:25px;padding:26px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.excerpt-heading{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:20px}.excerpt-heading h3{font-size:16px;letter-spacing:-.025em;margin:0}.excerpt-heading>span{font-size:10px;color:var(--muted)}.paper-excerpt .question-prompt{font-size:16px;line-height:1.8}.paper-excerpt>.small{margin:20px 0 0}.static-question-map{max-width:850px;border:1px solid var(--line);border-radius:12px;padding:17px 20px;margin:18px 0 0}.static-question-map summary{cursor:pointer;font-size:12px;font-weight:550}.static-question-map summary>span{font-size:10px;font-weight:400;color:var(--muted);margin-left:12px}.static-question-map ol{margin:20px 0 15px}.static-question-map li>span{display:grid;place-items:center;min-width:36px;min-height:34px;border:1px solid var(--line);border-radius:6px;font-size:11px;color:var(--ink);background:var(--soft)}.static-question-map li>span.unavailable{background:transparent;border-style:dashed;color:var(--muted)}.map-grid button:disabled{cursor:not-allowed;opacity:.65}.paper-source-panel{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:22px 0;margin-top:15px}.paper-source-panel>summary{font-size:13px;font-weight:600;cursor:pointer}.paper-source-panel>div{max-width:800px;padding-top:20px;font-size:14px}.source-reference{font-size:13px;text-decoration:underline;text-underline-offset:4px}.paper-source-panel .small{margin-top:18px}.paper-source-panel .text-link{font-size:12px}.paper-related{padding:30px 0 0}.paper-related h2{font-size:23px;margin-bottom:20px}.related-resource-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.related-resource-grid a{padding:19px;border:1px solid var(--line);border-radius:12px;background:var(--surface);display:flex;flex-direction:column;gap:9px}.related-resource-grid a:hover{border-color:var(--green)}.related-resource-grid span{font-size:10px;color:var(--muted)}.related-resource-grid b{font-size:13px;line-height:1.5}.related-resource-grid small{font-size:10px;color:var(--muted)}.inline-practice .session-app:not(:empty){margin-top:22px}.inline-practice .session-top h2{font-size:23px}.voice-draft{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding:15px;background:var(--soft);border-radius:10px}.voice-draft audio{max-width:100%}.session-settings input:disabled{opacity:.5}.source-crop img{font-size:11px}.paper-excerpt .source-crop{margin-top:20px}
@media(max-width:760px){.paper-heading{padding-top:28px}.paper-heading h1{font-size:32px}.paper-heading h1>span{font-size:19px}.paper-lead{font-size:13px}.paper-action-row{gap:12px;align-items:start}.paper-action-row .actions{gap:8px}.paper-action-row .button{padding:11px 14px;min-height:42px;font-size:11px;gap:10px}.paper-share>summary{font-size:11px;padding:10px}.paper-facts{grid-template-columns:1fr 1fr;gap:20px 18px;padding:19px 0}.paper-introduction{font-size:13px;padding-top:20px}.practice-section-heading{align-items:start;flex-wrap:wrap;gap:12px}.practice-section-heading h2{font-size:24px}.trial-note{font-size:10px}.practice-setup{padding:20px}.practice-setup .form-grid{grid-template-columns:1fr;gap:16px}.session-settings[open]>.form-grid{grid-template-columns:1fr}.setup-submit{gap:13px;flex-wrap:wrap}.setup-submit>span{font-size:10px}.paper-excerpt{padding:20px}.excerpt-heading{gap:10px}.excerpt-heading h3{font-size:15px}.paper-excerpt .question-prompt{font-size:14px}.static-question-map{padding:15px}.static-question-map summary>span{display:block;margin:5px 0 0 17px}.related-resource-grid{grid-template-columns:1fr}.related-resource-grid a{padding:17px}.paper-source-panel>div{font-size:13px}.paper-source-panel{padding:20px 0}.share-menu{width:175px}.inline-practice .session-top h2{font-size:21px}.paper-heading .eyebrow{font-size:9px}.paper-related h2{font-size:22px}}

.practice-setup[data-simple="true"]>.form-grid{grid-template-columns:minmax(0,430px)}.session-settings .form-grid>label[hidden]{display:none}.paper-excerpt .sample-options{padding-left:23px}.paper-excerpt .sample-options li{padding:5px 0}.paper-facts dd{overflow-wrap:anywhere}.paper-share summary:focus-visible,.session-settings summary:focus-visible{outline:3px solid #94b674;outline-offset:3px}
