.visuallyHidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:4px 0;margin:0;padding:0;font-size:14px;color:var(--muted)}.crumbs li{display:inline-flex;align-items:center;min-width:0}.crumbs li+li:before{content:"/";margin:0 10px;color:var(--line-2);color:#b9b3c6}.crumbs a{text-decoration:none;color:var(--ink-2)}.crumbs a:hover{color:var(--brand-ink);text-decoration:underline;text-underline-offset:3px}.crumbs [aria-current]{color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:46ch}.tag{display:inline-flex;align-items:center;gap:6px;min-height:26px;padding:2px 10px;border-radius:999px;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;font-weight:500;letter-spacing:.04em;background:var(--paper-2);color:var(--ink-2);border:1px solid var(--line);white-space:nowrap}.tagBoard{background:var(--brand-soft);color:var(--brand-ink);border-color:#dccbff}.tagSoft{background:#fff6e5;color:var(--amber-ink);border-color:#f5d79c}.learnHero{padding-top:28px;padding-bottom:12px}.learnHero .eyebrow{margin:34px 0 14px}.learnHero h1{font-size:clamp(36px,6vw,64px);max-width:18ch}.learnLead{font-size:clamp(17px,2vw,19.5px);color:var(--ink-2);max-width:64ch;margin:22px 0 0}.learnUpdated{color:var(--muted);font-size:14px;margin:14px 0 0}.learnStats{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:26px 0 0}.learnStats li{background:var(--card);border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:14.5px;color:var(--ink-2)}.learnStats b{color:var(--ink)}.learnSection{margin-top:56px}.learnSectionHead{display:flex;align-items:baseline;flex-wrap:wrap;gap:6px 16px;padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:22px}.learnSectionHead h2{font-size:clamp(26px,3.4vw,36px)}.learnSectionHead p{margin:0;color:var(--muted);font-size:14.5px}.learnSubject+.learnSubject{margin-top:36px}.learnSubjectHead{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:8px 16px;margin-bottom:14px}.learnSubjectHead h3{font-size:22px;letter-spacing:-.02em}.learnSubjectHead h3 a{text-decoration:none}.learnSubjectHead h3 a:hover{color:var(--brand-ink)}.learnSubjectAll{font-size:14.5px;color:var(--brand-ink)!important;text-decoration:none;font-weight:600}.learnSubjectAll:hover{text-decoration:underline;text-underline-offset:3px}.guideGrid{list-style:none;margin:0;padding:0;display:grid;grid-gap:14px;gap:14px;grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr))}.guideGridWide{grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr))}.guideGridCompact{grid-template-columns:repeat(auto-fill,minmax(min(100%,220px),1fr))}.guideCard a{height:100%;display:flex;flex-direction:column;gap:8px;padding:18px 18px 16px;border-radius:var(--radius-sm);background:var(--card);border:1px solid var(--line);text-decoration:none;box-shadow:0 1px 0 rgba(21,18,31,.03);transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s}.guideCard a:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d9ccf7}.guideCardMeta{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-family:var(--font-mono),monospace;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--brand-ink)}.guideCardMeta .tag{text-transform:none;letter-spacing:.02em;min-height:22px;font-size:11px}.guideCardTitle{font-weight:650;font-size:18px;line-height:1.25;letter-spacing:-.015em;color:var(--ink)}.guideCardSummary{color:var(--ink-2);font-size:15px;line-height:1.5}.guideCardFoot{margin-top:auto;padding-top:6px;display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:13.5px}.guideCardArrow{color:var(--brand-ink);transition:transform .3s var(--ease)}.guideCard a:hover .guideCardArrow{transform:translateX(4px)}.learnOther{margin-top:64px}.learnOther h2{font-size:22px;letter-spacing:-.02em;margin-bottom:14px}.learnOther ul{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0}.learnMore{margin-top:72px;padding-top:40px;padding-bottom:8px;border-top:1px solid var(--line)}.learnMore h2{font-size:clamp(24px,3vw,32px);max-width:24ch}.learnMore p{color:var(--ink-2);max-width:60ch;margin:12px 0 22px}.guideHead{padding-top:28px;max-width:920px}.guideHead .eyebrow{margin:30px 0 14px}.guideHead h1{font-size:clamp(32px,5.2vw,56px);line-height:1.04}.guideH1Sub{display:block;margin-top:10px;font-size:.5em;line-height:1.2;letter-spacing:-.02em;color:var(--ink-2);font-weight:600}.guideFacts{list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px;padding:0;margin:22px 0 0;color:var(--muted);font-size:14.5px}.guideFacts li:not(.tag)+li:not(.tag):before{content:"·";margin-right:16px;color:#b9b3c6}.guideLayout{display:grid;grid-template-columns:minmax(0,1fr);grid-gap:32px;gap:32px;margin-top:30px}.guideBody{min-width:0;max-width:72ch}.guideToc{display:none}@media (min-width:1040px){.guideLayout{grid-template-columns:220px minmax(0,1fr);gap:56px}.guideToc{display:block;position:-webkit-sticky;position:sticky;top:92px;align-self:start;padding-top:6px}.guideTocTitle{font-family:var(--font-mono),monospace;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}.guideToc ol{list-style:none;margin:0;padding:0 0 0 14px;border-left:2px solid var(--line);display:grid;grid-gap:2px;gap:2px}.guideToc ol a{display:block;padding:6px 0;font-size:15px;color:var(--ink-2);text-decoration:none;transition:color .2s,transform .25s var(--ease)}.guideToc ol a:hover{color:var(--brand-ink);transform:translateX(3px)}.guideTocCta{margin-top:20px}}.quickAnswer{position:relative;padding:22px 24px 22px 26px;border-radius:var(--radius-sm);background:var(--card);border:1px solid #e3d6ff;box-shadow:var(--shadow)}.quickAnswer:before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:4px;border-radius:0 4px 4px 0;background:var(--grad)}.quickAnswerLabel{margin:0 0 6px;font-family:var(--font-mono),monospace;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-ink)}.quickAnswerText{margin:0;font-size:18.5px;line-height:1.6;color:var(--ink)}.guideSection{margin-top:56px}.guideBody section[id],.guideSection{scroll-margin-top:90px}.guideSection>h2{font-size:clamp(26px,3.2vw,34px);margin-bottom:18px}.sectionLead{color:var(--ink-2);margin:-6px 0 18px;font-size:16px}.lessonList{list-style:none;margin:0;padding:0;display:grid;grid-gap:12px;gap:12px}.lessonItem{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 18px 14px}.lessonItemHead{display:grid;grid-template-columns:auto 1fr auto;align-items:center;grid-gap:12px;gap:12px}.lessonNum{width:32px;height:32px;border-radius:10px;display:grid;place-items:center;background:var(--brand-soft);color:var(--brand-ink);font-weight:700;font-size:15px}.lessonItemHead h3{font-size:18px;letter-spacing:-.015em;line-height:1.25}.lessonMin{font-family:var(--font-mono),monospace;font-size:12.5px;color:var(--muted);white-space:nowrap}.conceptList{margin:12px 0 0;padding:0 0 0 44px;display:grid;grid-gap:4px;gap:4px;color:var(--ink-2);font-size:15.5px;line-height:1.5}.conceptList li::marker{color:#b9a4ee}.conceptList .tag{margin-left:8px;min-height:20px;font-size:11px;padding:0 8px;vertical-align:1px}.conceptMuted{color:var(--muted)}.conceptGrid{margin:0;display:grid;grid-gap:12px;gap:12px;grid-template-columns:repeat(auto-fill,minmax(min(100%,290px),1fr))}.conceptCard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 18px}.conceptCard dt{font-weight:650;font-size:16.5px;letter-spacing:-.01em;margin-bottom:6px;color:var(--ink)}.conceptCard dd{margin:0;color:var(--ink-2);font-size:15.5px;line-height:1.55}.examList{margin:0;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--card);overflow:hidden}.examRow{display:grid;grid-template-columns:170px minmax(0,1fr);grid-gap:16px;gap:16px;padding:14px 18px}.examRow+.examRow{border-top:1px solid var(--line)}.examRow dt{font-family:var(--font-mono),monospace;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--brand-ink);padding-top:3px}.examRow dd{margin:0;color:var(--ink-2);font-size:15.5px;line-height:1.55;overflow-wrap:anywhere}@media (max-width:640px){.examRow{grid-template-columns:1fr;gap:4px}}.questionList{list-style:none;margin:0;padding:0;display:grid;grid-gap:14px;gap:14px}.questionCard{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 20px}.questionMeta{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 10px}.questionStem{margin:0;font-size:17px;line-height:1.55;color:var(--ink);white-space:pre-line;overflow-wrap:anywhere}.markingLabel{margin:16px 0 8px;font-family:var(--font-mono),monospace;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}.markingList{list-style:none;margin:0;padding:0;display:grid;grid-gap:6px;gap:6px}.markingList li{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-gap:12px;gap:12px;align-items:start;padding:8px 12px;border-radius:10px;background:var(--paper);color:var(--ink-2);font-size:15px;line-height:1.5}.markingMarks{font-family:var(--font-mono),monospace;font-size:12.5px;font-weight:600;color:var(--green);background:var(--green-soft);border-radius:999px;padding:2px 9px;white-space:nowrap}.faqList{display:grid;grid-gap:10px;gap:10px}.faqItem{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);transition:border-color .25s,box-shadow .25s var(--ease)}.faqItem[open]{border-color:#dccbff;box-shadow:0 10px 30px -22px rgba(60,25,140,.5)}.faqItem summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 18px;border-radius:var(--radius-sm)}.faqItem summary::-webkit-details-marker{display:none}.faqItem summary h3{font-size:16.5px;line-height:1.4;letter-spacing:-.01em;font-weight:620}.faqItem summary:after{content:"";flex:none;width:10px;height:10px;border-right:2px solid var(--brand-ink);border-bottom:2px solid var(--brand-ink);transform:rotate(45deg) translateY(-3px);transition:transform .3s var(--ease)}.faqItem[open] summary:after{transform:rotate(-135deg) translateY(-2px)}.faqItem p{margin:0;padding:0 18px 18px;color:var(--ink-2);font-size:16px;line-height:1.6}@media (prefers-reduced-motion:no-preference){.faqItem[open] p{animation:faqIn .35s var(--ease)}@keyframes faqIn{0%{opacity:0;transform:translateY(-4px)}}}.lessonPreview{margin-top:56px;scroll-margin-top:90px;display:grid;grid-gap:22px;gap:22px;grid-template-columns:minmax(0,1fr);align-items:center;border-radius:var(--radius);padding:18px;background:linear-gradient(180deg,#fff,#fbf8ff);border:1px solid #e3d6ff;box-shadow:var(--shadow-lg)}@media (min-width:760px){.lessonPreview{grid-template-columns:1fr 1.05fr;padding:22px}}.lessonPreviewStage{position:relative;aspect-ratio:16/10;border-radius:16px;overflow:hidden;background:var(--grad)}.lessonPreviewPaper{position:absolute;inset:9% 7%;border-radius:12px;background:var(--paper);box-shadow:0 20px 40px -20px rgba(30,10,80,.6);display:flex;flex-direction:column;gap:9%;padding:7% 8%;filter:saturate(.9)}.lpChip{align-self:flex-start;font-family:var(--font-mono),monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--brand-ink);background:var(--brand-soft);padding:3px 8px;border-radius:999px}.lpLine{display:block;height:9%;border-radius:6px;background:var(--paper-3)}.lpLine1{width:80%;background:#ddd2f7}.lpLine2{width:64%}.lpLine3{width:72%}.lpTutor{margin-top:auto;align-self:flex-end;font-size:12px;color:var(--ink-2);background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 10px}.lpTutor b{color:var(--brand-ink)}.lessonPreviewLock{position:absolute;left:50%;top:50%;width:58px;height:58px;margin:-29px 0 0 -29px;border-radius:50%;display:grid;place-items:center;color:var(--ink);background:rgba(255,255,255,.92);box-shadow:0 14px 30px -12px rgba(30,10,80,.55)}@media (prefers-reduced-motion:no-preference){.lessonPreviewLock:after{content:"";position:absolute;inset:-6px;border-radius:50%;border:2px solid rgba(255,255,255,.8);animation:lockPulse 2.6s var(--ease) infinite}@keyframes lockPulse{0%{transform:scale(.9);opacity:.9}to{transform:scale(1.35);opacity:0}}}.lessonPreviewBody{padding:4px 6px 6px}.lessonPreviewBody .eyebrow{margin:0 0 8px}.lessonPreviewBody h2{font-size:clamp(22px,2.6vw,28px);line-height:1.15}.lessonPreviewBody p{color:var(--ink-2);font-size:15.5px;margin:10px 0 0}.lessonPreviewNote{color:var(--muted)!important;font-size:14px!important}.lessonPreviewCtas{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.relatedAll{margin:16px 0 0}.relatedAll a{color:var(--brand-ink);font-weight:600;text-decoration:none}.relatedAll a:hover{text-decoration:underline;text-underline-offset:3px}.guideFoot{margin-top:48px;padding-top:18px;border-top:1px solid var(--line)}.guideFoot p{margin:0;color:var(--muted);font-size:14px}@media (max-width:520px){.quickAnswer{padding:18px 18px 18px 22px}.quickAnswerText{font-size:17px}.conceptList{padding-left:22px}.lessonItemHead{gap:10px}.questionCard{padding:16px}.guideH1Sub{font-size:.56em}}@media (prefers-reduced-motion:no-preference){.revealReady .guide [data-reveal]:not(.in),.revealReady .learn [data-reveal]:not(.in){opacity:1;transform:translateY(14px)}}