/* A quiet reading space. Layout is live HTML, with independent artwork. */
:root{--bg:#fafaf7;--paper:#fff;--ink:#25352e;--muted:#7e857e;--line:#e5e9e1;--green:#346f54;--pale:#edf3eb}
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p{font-size:13px}.metrics{padding:29px 0 30px;gap:0;border:0}.metrics>div{padding:0 28px;border-right:1px solid var(--line);gap:8px}.metrics>div:first-child{padding-left:0}.metrics>div:last-child{border:0}.metrics strong{font-size:32px;font-weight:600}.metrics>div>span{font-size:12px}.metrics strong small{font-size:12px}.resume{position:relative;isolation:isolate;border-radius:10px;overflow:hidden;background:#edf3eb url('ui/books-banner.png') center/cover no-repeat;padding:28px 30px;margin:0 0 26px;min-height:150px}.resume:before{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(90deg,#edf3ebf2 0%,#edf3ebdd 37%,#edf3eb30 70%,#edf3eb77)}.resume>div{max-width:65%}.resume h2{font-size:23px;font-weight:600;line-height:1.5}.resume p{color:#667362;font-size:12px}.resume .eyebrow{font-size:11px;letter-spacing:1px;color:#63755f}.primary,.secondary{border-radius:7px;font-size:13px;min-height:42px;padding:11px 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small{min-width:30px}.shelf-actions{gap:18px;margin-left:20px}.home-bottom{gap:40px;margin-top:28px}.home-bottom>section{min-width:0}.saved-line{padding:14px 0}.saved-line span{font-size:13px}.saved-line small{font-size:11px}.heatmap{margin-top:18px;gap:5px}.heat{border-radius:3px}.tiny{font-size:11px}.empty-inline{font-size:13px}.library-heading{padding:24px 30px 21px;min-height:96px}.library-heading h1{font-size:28px;margin:0}.library-heading h1 small{font-size:12px;margin-left:15px}.library-actions{gap:22px}.filters{display:flex;gap:12px 18px;padding:15px 30px;border-top:1px solid var(--line);border-bottom:0;background:#fcfcfa}.filters label{font-size:10px;gap:3px;min-width:95px;max-width:165px}.filters select{font-size:12px;max-width:165px;border:0;padding-top:4px;padding-bottom:4px;min-height:28px}.filters label:has(select:disabled){opacity:.45}.filters label:has(#filter-pool),.filters label:has(#filter-order){display:none}.filters-open .filters label:has(#filter-pool),.filters-open .filters label:has(#filter-order){display:flex}.filters label[hidden]{display:none!important}.reset-filters{font-size:11px}.question-list{width:290px;padding:8px 12px 25px;background:#fdfdfa;scrollbar-width:thin;scrollbar-color:#ccd4c8 transparent;overscroll-behavior-y:contain}.group-title{padding:15px 12px 13px;font-size:11px;background:#fdfdfa;line-height:1.8;font-weight:500}.question-row{border-left:3px solid transparent;border-radius:5px;padding:14px 13px;margin-bottom:3px;gap:7px;border-bottom:1px solid #edf0e9}.question-row.active{background:var(--pale);border-left-color:var(--green)}.row-top{font-size:12px;font-weight:600}.row-preview{font-size:12px;color:#70796d;line-height:1.8}.row-history{font-size:10px;margin-top:0}.question-detail{background:#fff;scrollbar-width:thin;scrollbar-color:#ccd4c8 transparent}.detail-toolbar{padding:10px 25px;min-height:53px}.detail-content{max-width:1000px;padding:25px 34px 30px}.question-path{font-size:11px;margin-bottom:18px}.question-heading h2{font-size:24px}.tag-toggle{border-radius:20px;padding:6px 13px;font-size:11px}.question-history{margin:12px 0 27px;font-size:11px}.question-history strong{font-size:15px}.question-body{font-size:var(--reading-size);line-height:1.95}.options{gap:7px;margin-top:20px}.option{background:transparent;border-color:transparent;padding:10px 13px;font-size:var(--reading-size);align-items:baseline}.option-key{border-radius:50%;background:#edf3ed;color:#2f654a;min-width:32px;height:32px;display:flex;align-items:center;justify-content:center;font:600 16px/1 -apple-system,BlinkMacSystemFont,sans-serif}.option.chosen{background:#edf3eb;border-color:#aac3a4}.option.correct{background:#edf5e9;border-color:#bbd2b3}.option.wrong{background:#fff2e9;border-color:#e7cdb6}.solution{border-top:1px solid var(--line);background:linear-gradient(#f3f7f0,#f9fbf6);border-radius:7px;padding:20px 22px;font-size:calc(var(--reading-size) - 1px);color:#465542}.solution-heading h3{font-size:16px;color:#254f36}.study-tools{padding-top:15px;margin-top:26px;gap:20px}.compact-note summary{font-size:12px;color:#60765c}.compact-note summary:after{content:'⌄';margin-left:auto;color:#94a18c}.compact-note summary span{font-size:10px}.compact-note textarea{font-size:13px;min-height:70px}.question-footer{align-items:center;margin-top:28px;color:#929d89;font-size:10px}.question-footer .secondary{font-size:11px;min-height:34px;padding:7px 12px;gap:6px}.question-footer .icon{width:14px;height:14px}.touch-hint{display:none}.collection-back{display:inline-flex}.detail-position{margin-right:auto}.detail-toolbar:has(.collection-back) .detail-position{margin-left:auto;margin-right:20px}.collection-tree{width:240px;flex-shrink:0;overflow:auto;padding:24px 16px;border-right:1px solid var(--line)}.collection-tree h2{font-size:15px;margin:0 10px 20px}.collection-tree button{display:flex;align-items:center;text-align:left;width:100%;gap:8px;font-size:12px;padding:12px 10px;border-radius:5px;line-height:1.7}.collection-tree small{margin-left:auto;color:var(--muted);font-size:10px}.collection-tree .active{background:var(--pale);color:var(--green)}.collection-tree section{margin-top:9px}.collection-tree .tree-chapter{padding-left:25px;font-size:11px}.collection-tree .tree-section{padding-left:38px;font-size:10px;color:#7b8772}.collection-results{flex:1;width:auto;padding:9px 24px;background:var(--bg)}.collection-results .group-title{background:var(--bg);padding-left:0;border-bottom:1px solid var(--line);font-size:12px;padding-top:20px}.collection-row{display:flex;gap:15px;align-items:center;width:100%;padding:22px 0;text-align:left;border-bottom:1px solid var(--line)}.collection-row:hover{background:#f3f6ef}.collection-row-icon{color:#b69846;align-self:flex-start;margin-top:2px}.notes-library .collection-row-icon{color:var(--green)}.collection-row-main{display:flex;flex-direction:column;gap:9px;min-width:0;flex:1}.collection-row-main strong{font-size:13px;font-weight:600}.collection-row-main>span{font-size:12px;color:#65705e;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;line-height:1.8}.collection-row-main small{color:#919b88;font-size:10px;line-height:1.8}.collection-row-main em{font-style:normal;border-radius:12px;background:var(--pale);color:#53764a;font-size:10px;padding:3px 9px;margin-left:5px}.collection-history{font-size:11px;color:#7e8975;white-space:nowrap}.collection-row>.icon{width:14px;color:#9ca692}.note-excerpt{white-space:pre-wrap;line-height:1.8;font-size:13px;padding:12px 15px;background:#eef3e9;border-left:2px solid #abc09e;border-radius:0 4px 4px 0;color:#49613e;max-height:100px;overflow:hidden}.practice-library .question-list{width:245px;padding:25px 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@media(min-width:1400px){.page{padding-top:38px}.detail-content{padding:30px 45px}.question-list{width:325px}.collection-tree{width:260px}.library-heading{padding:26px 36px}.filters{padding-left:36px}}
@media(max-width:1150px) and (min-width:761px){.sidebar{width:185px;padding-left:10px;padding-right:10px}.brand{gap:8px}.brand strong{font-size:15px}.nav-item{font-size:13px}.page{padding:28px}.shelf-progress>span{display:none}.subject-name{width:155px}.shelf-actions .course-link{display:none}.topbar{padding:0 26px}.searchbox{width:280px}.question-list{width:235px}.question-row{padding:13px 10px}.detail-content{padding:24px}.question-heading{flex-direction:row}.question-heading h2{font-size:21px}.collection-tree{width:190px}.collection-results{padding-left:18px;padding-right:18px}.collection-history{font-size:10px}.practice-library .question-list{width:205px;grid-template-columns:repeat(4,minmax(0,1fr));padding:22px 15px}.practice-library .detail-content{padding:25px}.course-cover h2{font-size:20px}.home-bottom{gap:28px}.metrics>div{padding-left:20px}.shelf-progress .progress-track{min-width:30px}.shelf-actions{margin-left:5px;gap:14px}.filters label{max-width:135px;min-width:90px}.filters select{max-width:135px}}
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@media(max-width:360px){.page{padding-left:18px;padding-right:18px}.page-heading h1{font-size:25px}.detail-content,.practice-library .detail-content{padding-left:19px;padding-right:19px}.library-heading{padding-left:19px;padding-right:19px}.library-heading h1{font-size:22px}.question-heading h2{font-size:20px}.tag-toggle{padding:5px 8px}.subject-name h3{font-size:13px}.shelf-actions .text-button{font-size:9px}.collection-results{padding-left:18px;padding-right:18px}.practice-library .question-list{grid-template-columns:repeat(6,minmax(0,1fr))}}
.lesson-toc button.current{background:var(--pale);color:var(--green);border-radius:5px}.question-body table,.solution table{max-width:100%;border-collapse:collapse}.question-body td,.question-body th,.solution td,.solution th{padding:6px 9px;border:1px solid var(--line)}