:root{color-scheme:light;--ink:#191919;--muted:#606060;--line:#dcdcdc;--paper:#fff;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:#fff;font-synthesis:none}
*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0}button,input,select{font:inherit;color:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}a{color:inherit}button:disabled{cursor:default;opacity:.52}:focus-visible{outline:2px solid #333;outline-offset:3px}
.mast,footer{margin:0 auto;width:min(1040px,calc(100% - 68px));display:flex;align-items:center;justify-content:space-between;gap:15px}.mast{height:76px;border-bottom:1px solid var(--line)}.brand,nav,.paper-tools,.dialog-heading,.past-paper,.ledger-row{display:flex;align-items:center;gap:12px}.brand{font-size:19px;font-weight:650;letter-spacing:-.055em;text-decoration:none}.brand img{display:block}nav{gap:22px}.nav-link,.text-action,.close{background:none;border:0}.nav-link,.text-action{padding:6px 0;font-size:14px}.nav-link:hover,.text-action:hover,.brand:hover{text-decoration:underline;text-underline-offset:4px}.primary,.outline{border:1px solid var(--ink);padding:10px 17px;border-radius:4px;font-size:14px;font-weight:600}.primary{background:var(--ink);color:white}.primary:hover:not(:disabled){background:#363636}.outline{background:white}.outline:hover{background:#f6f6f6}main{width:min(620px,calc(100% - 44px));margin:0 auto;min-height:calc(100vh - 168px)}.page{padding:clamp(40px,8vh,82px) 0 56px}h1,h2,h3,p{margin:0}h1,#billing-title{font:normal clamp(43px,6.3vw,68px)/1.02 Georgia,'Times New Roman',serif;letter-spacing:-.065em}.lead{color:#4a4a4a;font-size:17px;line-height:1.55;margin:16px 0 34px;max-width:500px}h2{font:normal 29px/1.16 Georgia,serif;letter-spacing:-.04em}label,legend{display:block;font-size:14px;font-weight:600}fieldset{border:0;padding:0;margin:18px 0}legend{margin:0 0 5px}input:not([type=checkbox]),select{width:100%;font-size:16px;margin-top:8px;padding:12px 13px;border:1px solid #a7a7a7;border-radius:4px;background:#fff;min-height:47px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:17px}.advanced-line{border-block:1px solid var(--line);margin-top:24px}.disclosure{background:none;border:0;width:100%;padding:17px 0;display:flex;align-items:center;justify-content:space-between;font-size:15px}.disclosure:hover span:first-child{text-decoration:underline;text-underline-offset:4px}#advanced-symbol{font-size:22px;line-height:1}.hint,.feedback{font-size:14px;color:var(--muted);line-height:1.5}.feedback:not(:empty){margin-top:12px}#advanced{padding:20px 0;border-bottom:1px solid var(--line)}#custom>label,.check{margin-top:18px}.check{display:flex;align-items:center;gap:8px;font-weight:400}input[type=checkbox]{accent-color:#161616}.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:9px}.chips label{font-size:13px;font-weight:400;border:1px solid #bbb;padding:6px 8px;border-radius:3px}.chips label:has(:checked){border-color:#111}.paper-summary{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:25px 0 16px}.paper-summary strong{font-size:17px;font-weight:600}.paper-summary p{margin-top:4px}#cost{font-size:14px;white-space:nowrap}.generate{width:100%;min-height:48px}.section{margin-top:42px}.section>.hint{margin:8px 0 15px}.past-paper,.ledger-row,.dialog-heading,.paper-tools{justify-content:space-between}.past-paper,.ledger-row{padding:14px 0;border-bottom:1px solid var(--line);font-size:14px}.past-paper span,.ledger-row span{line-height:1.5}.past-paper small,.ledger-row small{display:block;color:var(--muted);margin-top:3px}.back-link{margin-bottom:19px}.metrics{display:grid;grid-template-columns:repeat(3,1fr);padding:22px 0;margin:18px 0;border-block:1px solid var(--line);gap:12px}.metrics span,.metrics strong{display:block}.metrics span{font-size:13px;color:var(--muted)}.metrics strong{margin-top:5px;font:30px Georgia,serif}.billing-actions{display:flex;gap:18px;flex-wrap:wrap;align-items:center;margin:16px 0 32px}.billing-intro{margin:15px 0}.ledger-row b{white-space:nowrap}.wide{width:100%;margin-top:18px}.text-action{text-decoration:underline;text-underline-offset:3px;margin-top:10px}
dialog{width:min(450px,calc(100vw - 32px));border:1px solid #777;border-radius:7px;padding:26px;background:white;color:var(--ink);max-height:90vh}dialog::backdrop{background:#0006}dialog .hint,.dialog-copy{margin:12px 0 16px}.dialog-copy{line-height:1.6;font-size:15px}.close{font-size:24px;line-height:1;padding:5px}.dialog-heading{align-items:flex-start}dialog label{margin-top:14px}.pack{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:15px 0;border-top:1px solid var(--line)}.pack small{display:block;margin-top:5px;color:var(--muted)}footer{border-top:1px solid var(--line);padding:20px 0 25px;color:#555;font-size:13px}footer a{text-underline-offset:3px}
@media(max-width:570px){.mast,footer{width:calc(100% - 36px)}.mast{height:65px}.brand{font-size:17px;gap:5px}.brand img{width:26px}nav{gap:12px}.outline{padding:9px 12px}.fields{grid-template-columns:1fr;gap:14px}.lead{font-size:16px}.metrics{gap:7px}.metrics strong{font-size:25px}.paper-tools{flex-wrap:wrap}#reader{padding:0 10px}#document{padding:16px}}
#reader{max-width:860px;margin:24px auto;padding:0 24px}#document{margin:24px auto;background:white;border:1px solid var(--line);padding:36px;color:#151515;font-family:Georgia,serif;font-size:16px;line-height:1.45}.doc-header,.doc-intro,#document h1,#document h2,#document h3{font-family:Arial,sans-serif}.doc-header{font-size:11px;letter-spacing:.08em;text-transform:uppercase;font-weight:700;border-bottom:1px solid;padding-bottom:8px}#document h1{font-size:36px;line-height:1.2;margin:18px 0 7px;letter-spacing:-.045em}.doc-intro{font-size:14px}.doc-item{padding:14px 0;border-top:1px solid #aaa;margin-top:18px;break-inside:avoid}.doc-item h3{font-size:16px;margin:0 0 8px}.doc-item p{margin:6px 0}.doc-item ol{list-style:none;padding:0;margin:10px 0 0}.doc-item li{display:flex;gap:12px;align-items:baseline;margin:3px 0}.doc-item li b{min-width:14px}.doc-item li p{margin:0}.doc-item img{display:block;max-width:95%;max-height:200px;margin:8px auto}.doc-item .katex{font-size:1.04em}.solutions{break-before:page;margin-top:30px}.answergrid{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));border:solid #aaa;border-width:1px 0 0 1px;font:12px Arial,sans-serif;margin-top:8px}.answergrid span{padding:5px;border:solid #aaa;border-width:0 1px 1px 0;min-height:38px}.answergrid b{display:block;text-align:center}.record{break-inside:avoid;margin:20px 0}.paper-tools{background:var(--paper);padding:8px 0}.solutions h2{margin:20px 0}
@page{size:A4;margin:17mm 18mm}@media print{body{background:#fff}#app,dialog,.paper-tools,noscript{display:none!important}#reader,#document{border:0;padding:0;margin:0;max-width:none}#document{font-size:11.5pt}#document h1{font-size:26pt}.solutions{margin-top:0;padding-top:0}.doc-item{padding:8px 0;margin-top:12px}.doc-header{break-after:avoid}.doc-item img{max-height:165px}#document h1,#document h2,#document h3{break-after:avoid}}

.mast nav>a{text-decoration:none;color:var(--ink)}.mast nav>a:hover{text-decoration:underline}#auth-open{max-width:min(185px,32vw);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#auth-open.profile:before{content:"";display:inline-block;width:7px;height:7px;background:#222;border-radius:100%;margin:0 8px 2px 0}.back-link{display:inline-block;text-decoration:none}.page-title{font:normal clamp(40px,6vw,61px)/1.05 Georgia,serif;letter-spacing:-.055em}.plan-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.plan-card{display:flex;flex-direction:column;min-width:0;padding:18px 14px;border:1px solid #ccc;border-radius:4px;gap:11px}.plan-card.selected{border:2px solid #262626;padding:17px 13px}.plan-card h3{font:600 16px Arial,sans-serif;letter-spacing:-.02em}.plan-price{font:normal 34px Georgia,serif;letter-spacing:-.055em}.plan-card .hint{font-size:13px}.plan-card .allowance{font-size:15px;font-weight:600}.plan-card button{margin-top:auto;width:100%;min-height:40px;padding:8px 4px}.plan-footnote{margin-top:20px}#upgrade-modal{width:min(680px,calc(100vw - 28px))}#account-logout{margin:24px 0}#more-papers{margin-top:14px}.profile-info{overflow-wrap:anywhere}.profile-info strong{font-weight:600}.recent-list{margin-top:10px}
@media(max-width:620px){.plan-grid{grid-template-columns:1fr}.plan-card,.plan-card.selected{display:grid;grid-template-columns:1fr auto;gap:5px 14px}.plan-card>*{grid-column:1}.plan-card .plan-price{grid-column:2;grid-row:1/3;font-size:29px}.plan-card button{width:auto;grid-column:2;align-self:end;margin:0;min-width:88px;padding:8px}.plan-card .hint{align-self:center}.plan-card .allowance{margin:3px 0}#upgrade-modal{padding:18px}.mast nav{gap:12px}}