:root{--paper:#f7f4ed;--card:#fffdf8;--ink:#292923;--muted:#79796f;--line:#deded3;--red:#a94d3d;--soft:#eee9de;--green:#537263;--shadow:0 5px 22px #39332505;color-scheme:light}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.75 "Microsoft YaHei","PingFang SC",sans-serif}body.dark{--paper:#21231f;--card:#292c26;--ink:#eeeadd;--muted:#b1b3a4;--line:#494d41;--soft:#35392f;--red:#e39b87;--green:#a7c6ad;color-scheme:dark}button,input,select{font:inherit}button,a,input,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--red);outline-offset:4px}button:disabled{opacity:.45;cursor:not-allowed}.shell{max-width:1024px;margin:auto;padding:0 44px 112px}.masthead{height:94px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.brand{font-weight:600;letter-spacing:2px}.brand small{font-size:11px;font-weight:400;color:var(--muted);margin-left:12px;letter-spacing:1px}.seal{background:var(--red);color:#fffdf8;padding:5px 7px;border-radius:2px;margin-right:8px;font-family:serif}.icon{border:0;background:transparent;font-size:25px;padding:4px 8px}main{min-height:70vh}.eyebrow{color:var(--red);font-size:11px;letter-spacing:3px;text-transform:uppercase}.hero{padding:46px 0 30px;display:flex;align-items:center;justify-content:space-between;gap:24px}.hero h1{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-weight:500;font-size:44px;line-height:1.3;margin:12px 0 16px;letter-spacing:3px}.hero p{margin:0;color:var(--muted);font-size:13px}.edition{display:inline-block;font-size:12px;color:var(--red);border:1px solid var(--red);padding:2px 11px;margin-bottom:17px}.hero-mark{width:115px;height:145px;border:1px solid var(--line);display:grid;place-content:center;flex-shrink:0;transform:rotate(4deg);box-shadow:5px 5px 0 var(--soft);font:36px/1.6 SimSun,serif;letter-spacing:10px;padding-left:10px;color:var(--red)}.stats{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:12px;background:var(--card);padding:20px 0;margin:0 0 20px}.stat{text-align:center;border-right:1px solid var(--line)}.stat:last-child{border:0}.stat strong{display:block;font:30px/1.2 Georgia,serif;font-variant-numeric:tabular-nums}.stat span{display:block;font-size:11px;color:var(--muted);margin-top:7px}.note{font-size:12px;color:var(--muted);line-height:1.9;border-left:2px solid var(--line);padding-left:13px;margin:20px 0}.toolbar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:26px 0 20px}.search{flex:1;position:relative;min-width:200px}.search input{width:100%;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:11px 15px;color:var(--ink);font-size:13px}.small{font-size:12px;color:var(--muted)}.sectiontitle{display:flex;align-items:baseline;justify-content:space-between;margin:30px 0 14px;gap:15px}.sectiontitle h2{font:22px SimSun,serif;margin:0}.pill{display:inline-block;border:1px solid var(--line);border-radius:4px;color:var(--muted);padding:1px 7px;font-size:10px;letter-spacing:.5px}.pill.red{border-color:var(--red);color:var(--red)}.pill.green{color:var(--green);border-color:var(--green)}.bookgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.book{border:1px solid var(--line);border-radius:13px;background:var(--card);padding:22px 23px;box-shadow:var(--shadow);text-align:left;width:100%;transition:transform .16s,border-color .16s}.book:hover{transform:translateY(-3px);border-color:var(--red)}.book .num{font:italic 33px Georgia,serif;color:#b2afa2}.book h3{font:22px SimSun,serif;letter-spacing:1px;margin:15px 0 10px}.book .bookmeta{display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}.squares{display:flex;gap:3px;margin-top:21px}.squares i{height:6px;flex:1;background:var(--soft);border-radius:1px}.squares i.done{background:var(--green)}.bookfooter{display:flex;justify-content:space-between;font-size:10px;margin-top:7px;color:var(--muted)}.librarybar{border:1px solid var(--line);border-radius:10px;background:var(--soft);padding:18px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:27px}.librarybar strong{display:block;font-size:14px;font-weight:500}.librarybar p{font-size:11px;color:var(--muted);margin:5px 0 0}.arrow{font-size:22px;color:var(--red)}.bottom{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:min(1024px,100%);height:76px;background:var(--paper);border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);z-index:10;padding-bottom:env(safe-area-inset-bottom)}.bottom a{display:flex;align-items:center;justify-content:center;flex-direction:column;font-size:11px;color:var(--muted);gap:1px}.bottom a span{font:23px/1.1 Georgia,serif}.bottom a.active{color:var(--red)}.pagehead{padding:28px 0 15px}.back{color:var(--muted);font-size:12px}.pagehead h1{font:30px/1.4 SimSun,serif;margin:18px 0 8px}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0 22px}.chip,.btn{border:1px solid var(--line);border-radius:6px;background:transparent;padding:7px 12px;font-size:12px}.chip.active,.btn.primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}.chip:hover,.btn:hover{border-color:var(--red)}.btn.red{color:var(--red);border-color:var(--red)}.question{background:var(--card);border:1px solid var(--line);border-left:3px solid #c8c4b6;border-radius:11px;padding:23px 25px;margin:16px 0;box-shadow:var(--shadow)}.question.changed{border-left-color:var(--red)}.question.quarantine{border-left-style:dashed}.qhead{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:15px}.qnumber{font:italic 22px Georgia,serif;color:var(--muted)}.qhead .pill{margin-left:5px}.stem{font-size:15px;line-height:1.9;white-space:pre-line;margin:0 0 18px;overflow-wrap:anywhere}.options{display:grid;gap:8px;margin:12px 0 18px}.option{display:flex;text-align:left;width:100%;background:transparent;border:1px solid var(--line);border-radius:6px;padding:9px 12px;gap:12px;font-size:13px;line-height:1.7}.option b{color:var(--muted);font-family:Georgia,serif;min-width:14px}.option.selected{border-color:var(--red);background:var(--soft)}.option.correct{border-color:var(--green)}.answer summary{cursor:pointer;list-style:none;color:var(--red);font-size:12px;padding:10px 0}.answer summary::-webkit-details-marker{display:none}.answer summary:before{content:'＋ ';font-size:15px}.answer[open] summary:before{content:'－ '}.answerbody{border-top:1px dashed var(--line);padding:16px 0 2px}.answerline{font-size:14px;font-weight:600;color:var(--green)}.answerbody p{font-size:13px;line-height:1.95;white-space:pre-line;overflow-wrap:anywhere}.basis{color:var(--muted);font-size:12px!important}.sources{margin:15px 0 8px;color:var(--muted);font-size:11px}.sources a{color:var(--red);text-decoration:underline;text-underline-offset:3px}.markrow{border-top:1px solid var(--line);padding-top:14px;display:flex;align-items:center;gap:8px;margin-top:16px}.markrow .small{margin-right:auto;font-size:10px}.markrow button{font-size:11px;background:transparent;border:1px solid var(--line);border-radius:5px;padding:4px 10px}.markrow button.active{background:var(--soft);color:var(--red);border-color:var(--red)}.empty{padding:45px 20px;text-align:center;color:var(--muted);font-size:13px}.modes{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:22px}.mode{background:var(--card);border:1px solid var(--line);border-radius:11px;padding:24px;text-align:left}.mode span{font:25px Georgia,serif;color:var(--red)}.mode h2{font:23px SimSun,serif;margin:13px 0 9px}.mode p{color:var(--muted);font-size:12px;margin:0}.diff{padding:12px 15px;border-radius:6px;font-size:13px;margin:10px 0;background:var(--soft)}.diff.old{color:var(--red)}.diff.new{color:var(--green)}.diff label{font-size:10px;display:block;margin-bottom:4px}.panel{background:var(--card);border:1px solid var(--line);border-radius:11px;padding:24px;margin:18px 0}.panel h2{font:22px SimSun,serif;margin:0 0 14px}.panel p{font-size:12px;color:var(--muted)}.row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}.row:last-child{border-bottom:0}.row span{font-size:12px}.row strong{font-weight:400;font-size:13px}.source-select{max-width:100%;padding:9px;background:var(--card);border:1px solid var(--line);border-radius:6px;color:var(--ink);font-size:12px}.result{font-size:13px;padding:14px;background:var(--soft);border-radius:6px;color:var(--green);margin:14px 0}.result.wrong{color:var(--red)}.writing{width:100%;border:1px solid var(--line);background:var(--paper);border-radius:6px;padding:12px;color:var(--ink);font:inherit;min-height:90px}.progressline{height:3px;background:var(--line);margin:18px 0}.progressline i{height:100%;background:var(--red);display:block}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.footnote{font-size:10px;color:var(--muted);text-align:center;margin:29px 0 8px;letter-spacing:1px}.link{color:var(--red);text-decoration:underline}.loading{padding:60px;text-align:center}#toast{position:fixed;bottom:92px;left:50%;transform:translateX(-50%);max-width:90vw;background:var(--ink);color:var(--paper);padding:9px 18px;border-radius:6px;font-size:12px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:50}#toast.show{opacity:1}
@media(min-width:800px){.shell{padding-left:64px;padding-right:64px}.hero{padding-top:53px}.question{padding:27px 30px}.bottom{height:70px}.bottom a{flex-direction:row;gap:9px;font-size:13px}.bookgrid{gap:19px}}
@media(max-width:600px){.shell{padding:0 20px 110px}.masthead{height:70px}.brand{font-size:14px;letter-spacing:1px}.brand small{display:none}.hero{padding:29px 0 24px;gap:12px}.hero h1{font-size:33px;letter-spacing:2px}.hero-mark{width:72px;height:104px;font-size:24px;letter-spacing:6px;padding-left:6px}.hero p{font-size:11px}.edition{font-size:10px;margin-bottom:12px}.stats{padding:17px 0}.stat strong{font-size:27px}.stat span{font-size:10px}.bookgrid{grid-template-columns:repeat(2,1fr);gap:12px}.book{padding:17px 16px}.book h3{font-size:20px}.book .num{font-size:28px}.question{padding:19px 16px}.stem{font-size:14px}.qhead{align-items:flex-start}.qhead .pill{font-size:9px}.modes{gap:12px}.mode{padding:19px 16px}.mode h2{font-size:21px}.markrow{gap:5px}.markrow button{padding:4px 8px}.librarybar{padding:15px}.sectiontitle h2{font-size:21px}.pagehead h1{font-size:28px}.panel{padding:20px}.toolbar{gap:8px}.note{font-size:11px}}
.hero-count{font-family:Georgia,serif;letter-spacing:0;margin:0 5px}.revision-teaser{display:block;padding:20px 23px;background:var(--card);border:1px solid var(--line);border-radius:11px}.revision-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.revision-teaser>strong{font:22px SimSun,serif}.revision-teaser p{font-size:12px;margin:10px 0}.revision-teaser p:last-child{margin-bottom:0;font-size:10px;color:var(--muted)}.revision-pair{display:flex;gap:10px}.revision-pair span{flex:1;border-radius:5px;padding:7px 12px;background:var(--soft);font-size:11px;color:var(--red)}.revision-pair span:last-child{color:var(--green)}.revision-pair s,.revision-pair b{margin-left:10px;font-size:14px}.review-banner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:19px 22px;background:var(--soft);border-radius:10px;margin:18px 0}.review-banner strong{font-family:SimSun,serif;font-size:19px;font-weight:400}.review-banner p{font-size:11px;color:var(--muted);margin:6px 0 0}.review-banner .btn{flex-shrink:0}.proposed-answer{padding:18px 22px;background:var(--soft);border:1px dashed var(--line);border-radius:8px;margin:20px 0}.proposed-answer span{font-size:11px;color:var(--muted);display:block}.proposed-answer strong{font:32px Georgia,serif;color:var(--red);display:block;margin:6px 0}.proposed-answer p{font-size:11px;color:var(--muted);margin:4px 0}.modes .mode:last-child:nth-child(odd){grid-column:1/-1}
@media(max-width:600px){.review-banner{padding:16px;align-items:flex-start;flex-direction:column;gap:12px}.review-banner strong{font-size:18px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
.answer-hint{font-size:12px;color:var(--muted);margin:0 0 10px}
button.option{min-height:52px;align-items:center;touch-action:manipulation;transition:background .15s,border-color .15s}
button.option:hover:not(:disabled){background:var(--soft);border-color:var(--red)}
button.option:disabled{opacity:1;cursor:default}
.option span{flex:1;min-width:0;overflow-wrap:anywhere}
.option em{font:normal 12px/1.5 "Microsoft YaHei",sans-serif;flex-shrink:0}
.option.correct{border:2px solid var(--green);background:color-mix(in srgb,var(--green) 9%,var(--card));color:var(--green)}
.option.incorrect{border:2px solid var(--red);background:color-mix(in srgb,var(--red) 8%,var(--card));color:var(--red)}
.card-submit{min-height:48px;min-width:150px}.card-feedback .result{font-size:15px;line-height:1.8}
.card-feedback .btn,.markrow button,.chip,.btn{min-height:44px;touch-action:manipulation}
.answer summary{min-height:48px;display:flex;align-items:center;gap:6px}
.sources,.basis{overflow-wrap:anywhere}.shell{padding-bottom:calc(112px + env(safe-area-inset-bottom))}
.bottom{height:calc(76px + env(safe-area-inset-bottom))}
@media(min-width:601px) and (max-width:1100px){
 .shell{max-width:940px;padding-left:32px;padding-right:32px}
 .question{padding:28px 30px}.stem{font-size:18px}.option{font-size:16px;padding:14px 16px}
 .answerbody p{font-size:15px}.markrow button{padding:8px 18px;font-size:14px}
 .pagehead h1{font-size:32px}.chips{gap:10px}.chip{font-size:14px;padding:9px 15px}
 .bookgrid{gap:16px}.book{padding:22px 18px}.bottom{max-width:940px}
}
@media(max-width:600px){
 .shell{padding-left:14px;padding-right:14px}.question{padding:20px 16px;margin:14px 0;border-radius:14px}
 .stem{font-size:16px;line-height:1.9}.option{font-size:15px;padding:12px;gap:10px;flex-wrap:wrap}
 .option em{margin-left:auto}.option span{flex-basis:calc(100% - 32px)}
 .answerbody p{font-size:14px}.answer summary{font-size:14px}.answer-hint{font-size:12px}
 .markrow{flex-wrap:wrap;gap:8px}.markrow .small{flex-basis:100%;font-size:12px}
 .markrow button{flex:1;padding:8px 10px;font-size:13px}.card-submit{width:100%}
 .chips{gap:8px}.chip{padding:9px 12px}.search input{font-size:16px;min-height:48px}
 .writing{font-size:16px}.source-select{font-size:16px;min-height:44px}
 .bottom a{min-height:60px}.icon{min-width:44px;min-height:44px}
}
@media(max-width:360px){.hero-mark{display:none}.bookgrid,.modes{grid-template-columns:1fr}.revision-heading{flex-wrap:wrap;gap:8px}}

.reference-note{margin:12px 0;color:var(--muted);font-size:13px;line-height:1.7}.reference-note summary{cursor:pointer;min-height:44px;display:flex;align-items:center}.reference-note a{overflow-wrap:anywhere}
.bottom{grid-template-columns:repeat(3,1fr)}
.library-entry{margin:0 0 22px}
.library-toolbar .source-select{max-width:100%;min-width:0}
.library-options{overflow-wrap:anywhere;white-space:pre-line}
.library-options p{margin:10px 0}.library-options b{color:var(--muted);margin-right:8px}
.library-reason{padding:14px 16px;border-left:3px solid var(--red);background:var(--soft);border-radius:4px;font-size:13px;overflow-wrap:anywhere}
.library-reason p{margin:6px 0 0}
body.home-mode{background-color:var(--paper);background-image:radial-gradient(ellipse at 0 0,#d9e5d755,transparent 55%),radial-gradient(ellipse at 100% 30%,#ecd5b744,transparent 58%);background-attachment:fixed}
.learning-banner{--art-green:#628373;--art-leaf:#d4e0cf;--art-page:#fffdf5;--art-sun:#e8dcb4;--art-accent:#b67e60;display:flex;align-items:center;justify-content:space-between;gap:12px;position:relative;overflow:hidden;min-height:112px;border:1px solid #cdd7c966;border-radius:16px;padding:14px 24px;background:linear-gradient(112deg,#e9eee2,#f1ecdd 75%,#eee5cf)}
.learning-banner-copy{position:relative;z-index:1;min-width:0}
.learning-banner-copy strong{display:block;font:500 19px/1.7 "Noto Serif SC",SimSun,serif;color:#3d5849}
.learning-banner-copy p{margin:6px 0 0;font-size:12px;color:#72816c}
.learning-illustration{width:156px;height:104px;flex-shrink:0;margin:-8px -4px -8px 0}
.home-mode .category-card{background:color-mix(in srgb,var(--card) 94%,transparent);box-shadow:0 3px 16px #4b594007;border-color:color-mix(in srgb,var(--line) 83%,transparent)}
.home-mode .category-symbol{background:#e6ece1;color:#5c7865}
.home-mode .category-card:nth-child(2) .category-symbol,.home-mode .category-card:nth-child(4) .category-symbol{background:#f0e4dc;color:#a1735f}
.home-mode .category-card:nth-child(3) .category-symbol,.home-mode .category-card:nth-child(6) .category-symbol{background:#e4e9ec;color:#627f8d}
body.dark.home-mode{background-image:radial-gradient(ellipse at 0 0,#54755725,transparent 60%),radial-gradient(ellipse at 100% 30%,#a77b4520,transparent 58%)}
.dark .learning-banner{--art-green:#a4baa4;--art-leaf:#445c48;--art-page:#d7d4bb;--art-sun:#6b6745;--art-accent:#c59975;background:linear-gradient(112deg,#2d3b30,#3b3e2f);border-color:var(--line)}
.dark .learning-banner-copy strong{color:#dae4cd}.dark .learning-banner-copy p{color:#adbca4}
.dark.home-mode .category-symbol{background:var(--soft);color:var(--green)}
.dark.home-mode .category-card:nth-child(2n) .category-symbol{background:var(--soft);color:var(--red)}
@media(max-width:600px){.learning-banner{min-height:108px;padding:12px 16px;gap:6px}.learning-banner-copy strong{font-size:16px}.learning-banner-copy p{font-size:11px;line-height:1.7;max-width:190px}.learning-illustration{width:115px;height:90px;margin-right:-8px}.study-intro{margin-bottom:15px}}
@media(max-width:360px){.learning-banner{padding:12px}.learning-banner-copy strong{font-size:15px}.learning-illustration{width:90px;height:82px}.learning-banner-copy p{font-size:10px}}
.home-filters{margin-top:10px;font-size:12px;color:var(--muted)}
.home-filters>summary{cursor:pointer;min-height:44px;display:flex;align-items:center;gap:12px}
.home-filters>summary::after{content:'⌄';margin-left:auto}
.home-filters>summary span{color:var(--red);font-size:11px}
.home-filter-controls{display:grid;grid-template-columns:2fr 1fr;gap:12px;padding:8px 0 10px}
.home-filter-controls label{display:flex;flex-direction:column;gap:5px;min-width:0}
.home-filter-controls select{width:100%;min-width:0}
.question-results{display:grid;gap:10px}
.question-result{display:flex;flex-direction:column;align-items:flex-start;gap:8px;width:100%;text-align:left;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}
.question-result:hover{border-color:var(--red)}
.result-stem{font-size:14px;line-height:1.8;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere}
.result-open{font-size:12px;color:var(--red);align-self:flex-end}
@media(max-width:600px){.home-filter-controls{grid-template-columns:minmax(0,1fr)}.home-filter-controls .source-select{font-size:14px}}
.exam-meta{display:flex;align-items:center;flex-wrap:wrap;gap:6px 9px;font-size:12px;line-height:1.6;margin:0 0 16px;color:var(--muted)}
.exam-meta>div{display:flex;flex-wrap:wrap;gap:6px;min-width:0}
.exam-meta-label{font-weight:500;white-space:nowrap}
.exam-tag{background:var(--soft);color:var(--red);border-radius:5px;padding:3px 8px;overflow-wrap:anywhere}
.exam-source-note{font-size:10px}
.exam-unknown{font-size:11px}
body.deck-mode{height:100vh;height:100dvh;overflow:hidden}
.deck-mode .shell{height:100vh;height:100dvh;display:flex;flex-direction:column;padding-top:0;padding-bottom:calc(76px + env(safe-area-inset-bottom))}
.deck-mode .masthead{display:none}
.deck-mode main{flex:1;min-height:0;overflow:hidden;display:flex;flex-direction:column}
.book-deck{height:100%;min-height:0;display:flex;flex-direction:column}
.deck-header{display:flex;align-items:center;gap:12px;flex-shrink:0;min-height:64px}
.deck-header h1{font-size:19px;line-height:1.4;margin:0;font-weight:600}
.deck-back{display:grid;place-items:center;min-width:44px;min-height:44px;font-size:24px;border-radius:10px}
.deck-back:hover{background:var(--soft)}
.deck-position{margin-left:auto;font-size:13px;font-variant-numeric:tabular-nums;color:var(--muted);white-space:nowrap}
.deck-tools{display:flex;gap:12px;align-items:center;flex-shrink:0;margin-bottom:10px}
.deck-tools>.small:last-child{margin-left:auto}
.deck-tools .source-select{padding:6px 10px;min-height:40px;font-size:13px}
.deck-progress{height:3px;background:var(--line);margin-bottom:12px;flex-shrink:0;border-radius:3px;overflow:hidden}
.deck-progress i{display:block;height:100%;background:var(--red)}
.deck-viewport{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;border-radius:14px}
.deck-viewport>.question{margin:0;min-height:100%;box-shadow:none;padding:22px 24px}
.deck-viewport .qhead{margin-bottom:12px}
.deck-viewport .markrow{margin-top:12px}
.deck-navigation{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-shrink:0;padding:12px 0}
.deck-navigation .btn{min-width:120px;min-height:46px}
.deck-mode #toast{bottom:calc(148px + env(safe-area-inset-bottom))}
@media(max-width:600px){
 .deck-header{min-height:58px;gap:8px}.deck-header h1{font-size:17px}.deck-tools{gap:8px;margin-bottom:8px}.deck-tools>.small:last-child{display:none}
 .deck-viewport>.question{padding:17px 15px}.deck-viewport .stem{font-size:15px;line-height:1.8;margin-bottom:14px}.deck-viewport .option{min-height:46px;padding:9px 11px}
 .deck-navigation{gap:8px;padding:10px 0}.deck-navigation .btn{min-width:0;flex:1;font-size:14px}.deck-navigation>.small{display:none}
 .deck-viewport .answer-hint{font-size:11px}.deck-viewport .options{gap:7px;margin:10px 0 12px}.deck-progress{margin-bottom:10px}
}
.study-home{padding-top:26px}
.study-intro{margin-bottom:20px}
.group-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0}
.group-card{display:block;padding:22px;background:var(--card);border:1px solid var(--line);border-radius:14px;transition:border-color .2s,transform .2s}
.group-card:hover{border-color:var(--green);transform:translateY(-2px)}
.group-number{font:30px/1.2 Georgia,serif;color:var(--green)}
.group-card h2{font-size:19px;margin:12px 0 5px}.group-card p{font-size:12px;color:var(--muted);margin:0 0 16px}.group-status{font-size:12px;color:var(--green)}
@media(max-width:600px){.group-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.group-card{padding:18px 15px}}
.study-title{display:flex;align-items:center;justify-content:space-between;gap:16px}
.study-title h1{display:flex;align-items:baseline;gap:12px;font:600 30px/1.4 "Noto Serif SC","Songti SC",SimSun,serif;letter-spacing:2px;margin:0;padding:4px 0 6px}
.study-title .study-count{position:relative;isolation:isolate;font-family:Georgia,"Times New Roman",serif;font-size:46px;font-weight:400;line-height:1.15;letter-spacing:1px;color:var(--green);font-variant-numeric:lining-nums tabular-nums}
.study-title .study-count:after{content:"";position:absolute;z-index:-1;left:-3px;right:-3px;bottom:4px;height:9px;border-radius:2px;background:var(--green);opacity:.1}
@media(max-width:600px){.study-title h1{gap:9px;letter-spacing:1px}.study-title .study-count{font-size:38px}}
.study-total{font-size:13px;font-variant-numeric:tabular-nums;color:var(--muted);padding:4px 11px;border:1px solid var(--line);border-radius:20px;white-space:nowrap}
.study-quote{font-size:13px;color:var(--muted);margin:8px 0 0;letter-spacing:1px}
.home-search{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:0 15px;min-height:50px}
.home-search:focus-within{border-color:var(--red)}
.home-search svg{width:20px;height:20px;flex-shrink:0;color:var(--muted)}
.home-search input{width:100%;min-width:0;min-height:50px;background:transparent;border:0;color:var(--ink);font-size:15px;outline:none}
.home-search input:focus-visible{outline:0}
.home-search input::placeholder{color:var(--muted)}
.category-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:25px 0 13px}
.category-heading h2{font-size:16px;font-weight:600;margin:0}
.category-heading>span{font-size:12px;color:var(--muted)}
.category-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.category-card{display:block;min-width:0;padding:20px;border:1px solid var(--line);border-radius:14px;background:var(--card);transition:border-color .16s,transform .16s}
.category-card:hover{border-color:var(--red);transform:translateY(-2px)}
.category-top{display:flex;align-items:center;gap:10px;min-width:0}
.category-symbol{display:grid;place-items:center;width:32px;height:32px;flex-shrink:0;border-radius:9px;background:var(--soft);color:var(--red);font:18px SimSun,serif}
.category-top h3{margin:0;font-size:17px;line-height:1.5;font-weight:600}
.category-arrow{color:var(--muted);font-size:17px;margin-left:auto}
.category-description{margin:13px 0 15px;font-size:12px;color:var(--muted)}
.category-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:4px 8px;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.category-known{color:var(--green)}
.category-wide{grid-column:1/-1;display:grid;grid-template-columns:1fr auto;align-items:center;column-gap:20px}
.category-wide .category-top{grid-column:1;grid-row:1}
.category-wide .category-description{grid-column:1;grid-row:2;margin:8px 0 0 42px}
.category-wide .category-bottom{grid-column:2;grid-row:1/3}
.category-wide .category-arrow{display:none}
@media(max-width:799px){.category-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){
 .study-home{padding-top:20px}.study-intro{margin-bottom:16px}.study-title h1{font-size:24px}.study-total{font-size:12px}.study-quote{font-size:12px;margin-top:6px}
 .category-heading{margin-top:22px}.category-grid{gap:12px}.category-card{padding:16px 14px}.category-top{gap:8px}.category-top h3{font-size:16px}.category-symbol{width:28px;height:28px;font-size:16px}.category-arrow{font-size:15px}
 .category-description{font-size:11px;margin:11px 0 13px}.home-search input{font-size:16px}.category-wide .category-description{margin-left:36px}
}
@media(max-width:360px){.category-card{padding:14px 10px}.category-top{gap:6px}.category-top h3{font-size:15px}.category-symbol{width:25px;height:25px}.category-arrow{display:none}.category-description{font-size:10px}.category-wide .category-description{margin-left:31px}}
@media(max-width:600px){.library-toolbar .search,.library-toolbar .source-select{flex:1 1 100%;width:100%;min-width:0}.library-filters{flex-wrap:wrap}.library-question .qhead{flex-wrap:wrap}}

.access-locked .bottom{display:none}.access-locked .shell{padding-bottom:32px}.activation{max-width:460px;margin:54px auto;padding:34px 30px;background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);text-align:center}.activation-seal{display:inline-grid;place-items:center;width:48px;height:48px;background:var(--green);color:var(--card);border-radius:12px;font:28px SimSun,serif}.activation-kicker{font-size:11px;color:var(--green);margin:22px 0 12px}.activation h1{font:600 27px/1.5 SimSun,serif;margin:0 0 10px}.activation-description,.activation-tip{font-size:12px;color:var(--muted)}.activation form{text-align:left;margin:28px 0 18px}.activation label{display:block;font-size:13px;margin-bottom:8px}.activation input{width:100%;padding:14px;border:1px solid var(--line);border-radius:9px;background:var(--paper);color:var(--ink);font-size:15px}.activation form button{width:100%;padding:13px}.activation #activation-error{min-height:24px;color:var(--red);font-size:12px;margin:8px 0}.activation-tip{line-height:1.9}@media(max-width:600px){.activation{margin:30px auto;padding:28px 20px}.activation h1{font-size:25px}}
.volume-heading{display:flex;align-items:center;justify-content:space-between;margin:28px 0 18px}.volume-heading h2{margin:0;font:23px SimSun,serif}.volume-heading>span{font-size:12px;color:var(--muted)}
.volume-grid{grid-template-columns:repeat(2,minmax(0,1fr));margin-top:0;gap:16px}.volume-card{padding:25px 24px}.volume-card h2{display:flex;align-items:baseline;gap:8px;margin:0 0 20px}.volume-card .group-number{font:36px/1.2 Georgia,serif;color:var(--ink)}.volume-unit{font-size:13px;font-weight:400;color:var(--muted)}.volume-card p{font-size:13px;letter-spacing:1px;margin:0 0 15px}.volume-progress{display:flex;gap:3px;margin-bottom:13px}.volume-progress i{flex:1;height:9px;border-radius:2px;background:var(--soft)}.volume-progress i.filled{background:var(--green)}.volume-footer{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:12px}.specialty-section{margin:28px 0 38px}.specialty-section .category-heading{margin-top:14px}
@media(max-width:600px){.volume-grid{gap:12px}.volume-card{padding:22px 16px}.volume-card .group-number{font-size:31px}.volume-progress{gap:2px}.volume-footer{font-size:10px}.volume-card p{font-size:11px;letter-spacing:.5px}}
.volume-source{font-size:12px;color:var(--muted);margin:0 0 20px;letter-spacing:1px}.lmj-question .answer{margin-top:24px}.lmj-question .answer>summary{color:var(--green)}

/* Keep a comfortable, compact full-width answer target. */
.deck-viewport:has(>.lmj-question){display:flex;flex-direction:column}
.deck-viewport>.lmj-question{flex:1;display:flex;flex-direction:column}
.lmj-question>.qhead,.lmj-question>.stem,.lmj-question>.exam-meta{flex-shrink:0}
.lmj-question .answer:not([open]){flex:none}
.lmj-question .answer:not([open])>summary{width:min(100%,600px);min-height:340px;margin-inline:auto;justify-content:center;padding:16px;border:1px dashed var(--line);border-radius:12px;background:var(--soft);touch-action:manipulation}
.lmj-question .answer:not([open])>summary:before{content:none}
.lmj-question .answer:not([open])>summary:hover{border-color:var(--green)}
.lmj-question .answer-collapse-label,.lmj-question .answer[open] .answer-reveal-label{display:none}
.lmj-question .answer[open] .answer-collapse-label{display:inline}