:root{--bg:#f6f5f0;--paper:#fffefb;--ink:#263b35;--muted:#66756d;--line:#dddeda;--accent:#286b56;--soft:#e9f0e8;--mark:#ffe6a3}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.8 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}
button,input,select{font:inherit;color:inherit}
button,select,summary{cursor:pointer}
button{background:var(--paper);border:1px solid var(--line);border-radius:8px;padding:7px 12px}
button:hover{border-color:var(--accent);background:var(--soft)}
:focus-visible{outline:3px solid #b98936;outline-offset:3px}
header{border-bottom:1px solid var(--line);background:var(--paper);padding:22px 24px 15px}
.wrap{max-width:1160px;margin:auto}
.mast{display:flex;justify-content:space-between;align-items:center;gap:12px}
.eyebrow{font-size:11px;letter-spacing:3px;color:var(--accent)}
h1{font-family:"Songti SC","STSong",serif;font-size:27px;font-weight:600;margin:3px 0}
h2{font-size:19px;margin:26px 0 12px}
h3{font-size:16px;margin:12px 0}
.sub,.muted{color:var(--muted);font-size:13px}
.sub{margin:4px 0 15px}
.searchline{display:flex;gap:8px}
input[type=search]{min-width:0;width:100%;background:#f8f9f5;border:1px solid var(--line);border-radius:9px;padding:12px 14px;font-size:17px}
.primary{background:var(--accent);color:white;min-width:75px}
.primary:hover{background:#1e5544;color:white}
.filters,nav{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:12px}
.filters label{display:flex;gap:8px;align-items:center;font-size:13px;color:var(--muted)}
select{max-width:240px;border:1px solid var(--line);background:var(--paper);border-radius:7px;padding:5px 8px}
.quiet{background:transparent;font-size:13px}
.check{font-size:13px;display:flex;gap:5px;align-items:center}
main{padding:24px 24px 60px}
#meta{color:var(--muted);font-size:14px;margin-bottom:15px}
.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}
.lesson-card{text-align:left;padding:13px 15px;display:flex;justify-content:space-between;align-items:center;gap:10px}
.lesson-card small{color:var(--muted);white-space:nowrap;font-size:11px}
.book-heading{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:8px}
.book-heading span{color:var(--muted);font-size:13px;font-weight:400}
.welcome{background:var(--soft);padding:18px 22px;border-radius:12px;margin-bottom:22px}
.welcome h2{margin:0 0 4px}
.welcome p{margin:0;color:var(--muted);font-size:14px}
.recent{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:14px}
.recent button{font-size:13px;padding:3px 12px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:10px;margin-bottom:10px;overflow:hidden}
.card>summary{padding:14px 17px;list-style:none}
.card>summary::-webkit-details-marker{display:none}
.summarytop{display:flex;align-items:baseline;justify-content:space-between;gap:14px}
.term{font-size:19px;font-weight:600}
.source{font-size:12px;color:var(--muted)}
.preview{font-size:14px;color:#50645b;margin-top:4px}
.card[open]>summary{border-bottom:1px solid var(--line)}
.card[open]>summary .preview{display:none}
.cardbody{padding:15px 17px}
.field{margin:6px 0}
.field small{color:var(--muted);display:block;font-size:12px}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.actions button{font-size:13px}
.badge{font-size:11px;font-weight:400;color:var(--accent);margin-left:8px;background:var(--soft);padding:2px 6px;border-radius:4px}
mark{background:var(--mark);color:inherit;border-radius:3px}
.empty{padding:40px 12px;text-align:center;color:var(--muted)}
.reader{max-width:760px}
.reader-title{text-align:center;font:30px/1.5 "Songti SC",serif;margin:18px 0 5px}
.author{text-align:center;color:var(--muted);font-size:14px;margin-bottom:25px}
.reading{padding:27px 32px;background:var(--paper);border:1px solid var(--line);border-radius:12px}
.reading p{font:20px/2.15 "Songti SC","STSong",serif;margin:0 0 18px;scroll-margin-top:24px}
.word{font:inherit;line-height:inherit;display:inline;padding:0 1px;background:transparent;border:0;border-bottom:1px dotted #84a393;border-radius:2px}
.word:hover,.word.active{background:var(--mark)}
.target{background:#fff6d9;border-radius:6px}
.reader-tools{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:16px}
.reader-tools span{color:var(--muted);font-size:13px}
#panel{position:fixed;right:max(24px,calc((100vw - 1112px)/2));top:24px;bottom:24px;width:310px;overflow:auto;background:var(--paper);border:1px solid var(--line);box-shadow:0 12px 45px #263b3520;border-radius:13px;z-index:30;padding:16px}
#panel[hidden]{display:none}
.panelhead{display:flex;justify-content:space-between;align-items:center;position:sticky;top:-16px;background:var(--paper);padding:6px 0 12px;z-index:1}
.panelhead button{font-size:12px}
#panelContent .cardbody{padding:10px}
#panelContent .source{display:block}
#panelContent .summarytop{display:block}
.with-panel .reader{margin-right:345px;max-width:none}
.compare{margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}
.compare button{text-align:left;display:block;width:100%;margin:8px 0;font-size:14px}
footer{border-top:1px solid var(--line);padding-top:18px;margin-top:38px;color:var(--muted);font-size:12px}
footer a{color:var(--accent)}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.quiz .meaning{display:none}
.reveal{display:none;font-size:13px}
.quiz .reveal{display:inline-block}
.quiz .revealed .meaning{display:block}
.quiz .revealed .reveal{display:none}
.count{font-size:12px;font-weight:400;color:var(--muted)}
@media(min-width:1450px){#panel{width:330px}
.with-panel .reader{margin-right:365px}
}
@media(max-width:800px){header{padding:17px 16px}
h1{font-size:23px}
main{padding:18px 16px 50px}
.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.filters{gap:8px}
.filters label{flex:1 1 40%}
select{min-width:0;max-width:100%;width:100%}
.summarytop{display:block}
.source{display:block}
.reading{padding:20px}
.reading p{font-size:19px}
.with-panel .reader{margin-right:0}
#panel{top:auto;bottom:0;left:0;right:0;width:100%;max-height:48dvh;max-height:48vh;border-radius:16px 16px 0 0;padding-bottom:max(16px,env(safe-area-inset-bottom))}
.with-panel main{padding-bottom:52vh}
.reader-title{font-size:26px}
}
@media(max-width:420px){.lesson-grid{grid-template-columns:1fr}
.mast{align-items:flex-start}
.mast #home{white-space:nowrap;padding:5px 8px}
h1{font-size:21px}
}