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ease}.prep-search::-moz-placeholder{color:var(--p-ink-faint)}.prep-search::placeholder{color:var(--p-ink-faint)}.prep-search:focus{border-color:var(--p-accent);box-shadow:0 0 0 3px #5b8a3b26}.prep-hero{padding:56px 24px 24px}.prep-hero-inner{max-width:1280px;margin:0 auto}.prep-eyebrow{display:inline-block;font-family:var(--p-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--p-accent);background:var(--p-accent-soft);padding:5px 12px;border-radius:999px;margin-bottom:24px}.prep-h1{font-family:var(--p-serif);font-size:clamp(2.25rem,4vw + 1rem,4rem);font-weight:600;line-height:1.05;letter-spacing:-.02em;max-width:780px;margin-bottom:18px}.prep-h1 em{font-style:italic;font-weight:400;color:var(--p-ink-soft)}.prep-lede{font-family:var(--p-serif);font-size:19px;line-height:1.7;color:var(--p-ink-soft);max-width:640px;margin-bottom:24px}.prep-stats{font-family:var(--p-mono);font-size:13px;color:var(--p-ink-faint);display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap}.prep-stats strong{color:var(--p-ink);font-weight:600}.prep-stats-dot{opacity:.4}.prep-layout{max-width:1280px;margin:0 auto;padding:32px 24px 80px;display:grid;grid-template-columns:240px minmax(0,1fr);gap:56px}@media (max-width: 900px){.prep-layout{grid-template-columns:1fr;gap:24px}.prep-aside{display:none}}.prep-aside{position:sticky;top:76px;align-self:start;max-height:calc(100vh - 96px);overflow-y:auto;padding-right:8px}.prep-sidebar-label{font-family:var(--p-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--p-ink-faint);margin-bottom:14px;padding-left:12px}.prep-sidebar ul{list-style:none;padding:0;margin:0}.prep-sidebar-item{margin-bottom:2px}.prep-sidebar-row{display:flex;align-items:stretch;border-radius:8px;transition:background-color .15s ease}.prep-sidebar-row:hover{background:var(--p-bg-soft)}.prep-sidebar-link{display:flex;align-items:center;gap:10px;padding:9px 8px 9px 12px;flex:1;color:var(--p-ink-soft);font-size:14px;text-decoration:none;transition:color .15s ease;min-width:0}.prep-sidebar-link:hover{color:var(--p-ink)}.prep-sidebar-icon{width:22px;text-align:center;font-size:15px;flex-shrink:0}.prep-sidebar-title{flex:1;font-weight:500;min-width:0}.prep-sidebar-count{font-family:var(--p-mono);font-size:11px;color:var(--p-ink-faint);background:var(--p-bg-soft);padding:2px 8px;border-radius:999px}.prep-sidebar-row:hover .prep-sidebar-count{background:var(--p-bg-card)}.prep-sidebar-toggle{background:transparent;border:0;width:28px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--p-ink-faint);font-size:14px;border-radius:0 8px 8px 0;transition:transform .2s ease,color .15s ease}.prep-sidebar-toggle:hover{color:var(--p-ink)}.prep-sidebar-toggle-open{transform:rotate(180deg)}.prep-sidebar-sub{list-style:none;padding:0;border-left:1px solid var(--p-line);margin:4px 0 8px 22px}.prep-sidebar-sublink{display:flex;align-items:center;gap:8px;padding:6px 12px 6px 14px;font-size:13px;color:var(--p-ink-faint);text-decoration:none;border-radius:6px;transition:color .15s ease,background-color .15s ease}.prep-sidebar-sublink:hover{color:var(--p-ink);background:var(--p-bg-soft)}.prep-sidebar-subicon{font-size:13px;flex-shrink:0;opacity:.85}.prep-sidebar-subtitle{flex:1;min-width:0}.prep-sidebar-subcount{font-family:var(--p-mono);font-size:10px;opacity:.7}.diff-filter{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:32px}@media (max-width: 640px){.diff-filter{grid-template-columns:repeat(2,1fr)}}.diff-btn{text-align:left;background:var(--p-bg-card);border:1px solid var(--p-line);border-radius:12px;padding:14px 16px;cursor:pointer;transition:border-color .15s,transform .15s,background .15s;display:flex;flex-direction:column;gap:4px}.diff-btn:hover{border-color:var(--p-ink-soft);transform:translateY(-1px)}.diff-label{font-weight:600;font-size:14px;color:var(--p-ink)}.diff-hint{font-size:12px;color:var(--p-ink-faint)}.diff-active.diff-all{background:#2a2620;border-color:#2a2620}.diff-active.diff-easy{background:#d9ebc7;border-color:#5b8a3b}.diff-active.diff-medium{background:#fce6c2;border-color:#b97a14}.diff-active.diff-hard{background:#f5d4d4;border-color:#b54848}.diff-active .diff-label,.diff-active .diff-hint{color:var(--p-ink)}.diff-active.diff-all .diff-label,.diff-active.diff-all .diff-hint{color:#faf7f0}.prep-topics{display:flex;flex-direction:column;gap:24px}.topic{background:var(--p-bg-card);border:1px solid var(--p-line);border-radius:16px;overflow:hidden;scroll-margin-top:80px}.topic-head{display:flex;align-items:center;gap:16px;width:100%;background:transparent;border:0;padding:22px 24px;cursor:pointer;text-align:left}.topic-head:hover{background:var(--p-bg-soft)}.topic-icon{font-size:28px;line-height:1}.topic-title-block{flex:1;display:flex;flex-direction:column;gap:4px;min-width:0}.topic-title{font-family:var(--p-serif);font-size:22px;font-weight:600;color:var(--p-ink);letter-spacing:-.01em}.topic-blurb{font-size:13px;color:var(--p-ink-faint);line-height:1.5}.topic-counts{display:flex;gap:6px;flex-wrap:wrap;align-items:center}@media (max-width: 720px){.topic-counts{display:none}}.count-pill{font-family:var(--p-mono);font-size:10px;font-weight:600;padding:3px 8px;border-radius:999px;letter-spacing:.05em}.count-total{background:var(--p-ink);color:var(--p-bg);letter-spacing:.04em}.topic-chev{font-size:22px;color:var(--p-ink-faint);transition:transform .2s ease;margin-left:8px}.topic-chev-open{transform:rotate(180deg)}.topic-body{padding:0 24px 24px;border-top:1px solid var(--p-line-soft)}.topic-empty{padding:24px 4px;color:var(--p-ink-faint);font-style:italic}.subtopic-list{display:flex;flex-direction:column;gap:12px;padding-top:16px}.subtopic{background:var(--p-bg);border:1px solid var(--p-line);border-radius:12px;overflow:hidden;scroll-margin-top:80px;transition:border-color .15s ease}.subtopic-open,.subtopic:hover{border-color:var(--p-ink-soft)}.subtopic-head{width:100%;background:transparent;border:0;display:flex;align-items:center;gap:14px;padding:14px 18px;cursor:pointer;text-align:left}.subtopic-head:hover{background:var(--p-bg-soft)}.subtopic-icon{font-size:20px;line-height:1}.subtopic-title-block{flex:1;display:flex;flex-direction:column;gap:2px;min-width:0}.subtopic-title{font-family:var(--p-serif);font-size:17px;font-weight:600;color:var(--p-ink);letter-spacing:-.005em}.subtopic-blurb{font-size:12.5px;color:var(--p-ink-faint);line-height:1.5}.subtopic-counts{display:flex;gap:5px;align-items:center}@media (max-width: 720px){.subtopic-counts .count-pill:not(.count-total){display:none}}.subtopic-chev{font-size:18px;color:var(--p-ink-faint);transition:transform .2s ease;margin-left:4px}.subtopic-chev-open{transform:rotate(180deg)}.subtopic-body{padding:0 16px 16px;border-top:1px solid var(--p-line-soft)}.q-list{display:flex;flex-direction:column;gap:12px;padding-top:16px}.q-card{background:var(--p-bg);border:1px solid var(--p-line);border-radius:12px;overflow:hidden;transition:border-color .15s ease;scroll-margin-top:80px}.q-card:hover,.q-open{border-color:var(--p-ink-soft)}.q-head{width:100%;background:transparent;border:0;display:grid;grid-template-columns:auto 1fr auto auto;align-items:center;gap:14px;padding:16px 18px;cursor:pointer;text-align:left}.q-head:hover{background:var(--p-bg-soft)}.q-index{font-family:var(--p-mono);font-size:11px;color:var(--p-ink-faint);letter-spacing:.05em}.q-title{font-family:var(--p-serif);font-size:17px;line-height:1.5;color:var(--p-ink);font-weight:500}.q-pill{font-family:var(--p-mono);font-size:10px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;padding:4px 9px;border-radius:999px;white-space:nowrap}.q-easy{background:#d9ebc7;color:#2f5a16}.q-medium{background:#fce6c2;color:#7c4a03}.q-hard{background:#f5d4d4;color:#8a2424}.q-chev{color:var(--p-ink-faint);font-size:18px;transition:transform .2s ease}.q-chev-open{transform:rotate(180deg)}.q-body{padding:8px 22px 22px 56px;border-top:1px solid var(--p-line-soft);font-family:var(--p-serif)}@media (max-width: 640px){.q-body{padding-left:22px}}.prep-p{font-size:17px;line-height:1.75;color:var(--p-ink);margin-top:16px;max-width:68ch}.prep-h{font-family:var(--p-serif);font-size:18px;font-weight:600;color:var(--p-ink);margin-top:24px;margin-bottom:4px;letter-spacing:-.01em}.prep-list{list-style:none;padding:0;margin:16px 0 0;display:flex;flex-direction:column;gap:10px;max-width:68ch}.prep-list li{font-size:17px;line-height:1.7;color:var(--p-ink);position:relative;padding-left:22px}.prep-list li:before{content:"";position:absolute;left:4px;top:.7em;width:6px;height:6px;border-radius:999px;background:var(--p-accent)}.prep-code{position:relative;background:var(--p-code-bg);color:var(--p-code-ink);border-radius:10px;padding:18px 18px 14px;margin:18px 0 4px;overflow-x:auto;font-family:var(--p-mono);font-size:13.5px;line-height:1.65;border:1px solid var(--p-code-line)}.prep-code code{background:transparent;color:inherit;font-family:inherit}.prep-code-lang{position:absolute;top:8px;right:12px;font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:#8a8377}.prep-note{display:flex;gap:12px;align-items:flex-start;background:var(--p-accent-soft);border-left:3px solid var(--p-accent);border-radius:8px;padding:12px 16px;margin-top:18px;font-family:var(--p-serif);font-size:16px;line-height:1.6;color:var(--p-ink);max-width:68ch}.prep-note-label{font-family:var(--p-mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--p-accent);background:#fff9;padding:2px 8px;border-radius:999px;flex-shrink:0;margin-top:2px}.q-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px;padding-top:16px;border-top:1px dashed var(--p-line)}.q-tag{font-family:var(--p-mono);font-size:11px;color:var(--p-ink-faint)}.prep-empty{background:var(--p-bg-card);border:1px dashed var(--p-line);border-radius:12px;padding:48px 24px;text-align:center;color:var(--p-ink-faint);font-family:var(--p-serif);font-size:17px}.prep-foot{margin-top:48px;padding-top:24px;border-top:1px solid var(--p-line);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;font-size:14px;color:var(--p-ink-soft)}.prep-foot a{color:var(--p-accent);font-weight:500}.prep-foot a:hover{text-decoration:underline}.hover\:bg-\[var\(--accent-deep\)\]:hover{background-color:var(--accent-deep)}.hover\:bg-zinc-800:hover{--tw-bg-opacity: 1;background-color:rgb(39 39 42 / var(--tw-bg-opacity, 1))}.hover\:text-black:hover{--tw-text-opacity: 1;color:rgb(0 0 0 / var(--tw-text-opacity, 1))}.hover\:text-zinc-900:hover{--tw-text-opacity: 1;color:rgb(24 24 27 / var(--tw-text-opacity, 1))}.group:hover .group-hover\:translate-x-0\.5{--tw-translate-x: .125rem;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.group:hover .group-hover\:text-black{--tw-text-opacity: 1;color:rgb(0 0 0 / var(--tw-text-opacity, 1))}@media (min-width: 640px){.sm\:w-\[72\%\]{width:72%}.sm\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.sm\:flex-row{flex-direction:row}.sm\:items-center{align-items:center}.sm\:p-9{padding:2.25rem}.sm\:py-24{padding-top:6rem;padding-bottom:6rem}.sm\:py-28{padding-top:7rem;padding-bottom:7rem}.sm\:py-32{padding-top:8rem;padding-bottom:8rem}.sm\:pb-28{padding-bottom:7rem}.sm\:pt-24{padding-top:6rem}.sm\:text-4xl{font-size:2.25rem;line-height:2.5rem}.sm\:text-5xl{font-size:3rem;line-height:1}.sm\:text-6xl{font-size:3.75rem;line-height:1}.sm\:text-7xl{font-size:4.5rem;line-height:1}.sm\:text-base{font-size:1rem;line-height:1.5rem}.sm\:text-lg{font-size:1.125rem;line-height:1.75rem}}@media (min-width: 768px){.md\:flex{display:flex}.md\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.md\:text-5xl{font-size:3rem;line-height:1}.md\:text-6xl{font-size:3.75rem;line-height:1}.md\:text-7xl{font-size:4.5rem;line-height:1}}@media (min-width: 1024px){.lg\:col-span-5{grid-column:span 5 / span 5}.lg\:col-span-7{grid-column:span 7 / span 7}.lg\:grid-cols-12{grid-template-columns:repeat(12,minmax(0,1fr))}.lg\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.lg\:px-10{padding-left:2.5rem;padding-right:2.5rem}.lg\:text-\[5\.5rem\]{font-size:5.5rem}}