@charset "UTF-8";
:root{--paper:#fbfcf9;--canvas:#f6f7f3;--nav:#eef1eb;--ink:#263c34;--body:#37443e;--muted:#758077;--accent:#346a54;--accent-soft:#e1ebe3;--line:#dbe2d9;--gold:#9a6d31;--gold-soft:#f7f1e6;--reading:17px;--sidebar:282px;color-scheme:light;font-family:"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--canvas)}
*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:7px;padding:8px 12px;font-size:12px}button:hover{border-color:#9eb5a4;background:#f0f4ed}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid #78a690;outline-offset:3px}button:disabled{cursor:default;opacity:.45}.skip{position:fixed;top:-50px;left:20px;z-index:100;padding:10px;background:var(--ink);color:white}.skip:focus{top:10px}.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar);border-right:1px solid var(--line);background:var(--nav);overflow-y:auto;z-index:30;padding:27px 17px 18px;scrollbar-width:thin}.brand{display:flex;align-items:center;gap:11px;font-weight:650;font-size:16px;padding:0 9px 25px;letter-spacing:.5px}.brand small{display:block;color:var(--muted);font-size:10px;font-weight:400;letter-spacing:1.3px;margin-top:5px}.book-mark{display:grid;place-items:center;height:38px;width:34px;color:#fff;background:var(--accent);border-radius:3px 9px 9px 3px;font-family:serif;font-size:21px;border-left:3px solid #87a38f}.search-trigger{width:100%;display:flex;align-items:center;gap:7px;text-align:left;color:var(--muted);padding:10px;background:#f8faf6;font-size:11px}.search-trigger>span{font-size:21px;line-height:12px}.search-trigger kbd{margin-left:auto;font-size:10px;border:1px solid var(--line);padding:0 5px}.quick-nav{margin:18px 0 22px;display:grid;gap:3px}.quick-nav a{font-size:12px;padding:9px 11px;border-radius:5px;display:flex;justify-content:space-between}.quick-nav a:hover,.quick-nav a.active{background:var(--accent-soft);color:var(--accent)}.quick-nav a span{font-size:10px;color:var(--muted)}.nav-caption{font-size:10px;color:var(--muted);letter-spacing:1.5px;padding:0 10px 10px}#chapters 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.text-block.revealed{opacity:1}.reciting .english-block{border-left-color:#49754c}.recite-banner{display:none;background:var(--accent-soft);padding:12px 16px;font-size:12px;color:var(--accent);margin-bottom:19px;border-radius:5px}.reciting .recite-banner{display:block}dialog{border:1px solid var(--line);border-radius:12px;padding:0;color:var(--ink);box-shadow:0 24px 100px #18372633}dialog::backdrop{background:#18342655;backdrop-filter:blur(3px)}#search-dialog{width:min(720px,92vw);margin-top:12vh;max-height:76vh}.search-head{display:flex;align-items:center;gap:12px;padding:15px 19px;border-bottom:1px solid var(--line)}.search-head>span{font-size:25px;color:#7f927d}.search-head input{flex:1;min-width:0;border:0;outline:0;font-size:14px;background:transparent;color:var(--ink)}.search-head button{border:0;font-size:20px}.search-meta{font-size:10px;color:var(--muted);padding:12px 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@media(min-width:1550px){:root{--sidebar:300px}main{max-width:1230px;padding-top:55px}.lesson-layout{grid-template-columns:minmax(0,1fr) 180px;gap:50px}.sidebar{padding-left:23px;padding-right:23px}}
@media(max-width:1180px){:root{--sidebar:255px}.toolbar{padding:0 25px}main{padding:32px 30px}.lesson-layout{display:block}.lesson-side{display:none}.page-title{font-size:30px}}
@media(max-width:820px){:root{--sidebar:275px;--reading:16px}.sidebar{transform:translateX(-100%);transition:transform .2s}.nav-open .sidebar{transform:translateX(0)}.nav-open .scrim{display:block;position:fixed;inset:0;background:#263c3455;z-index:29}.workspace{margin-left:0}.mobile-menu{display:block}.toolbar{padding:0 16px;height:57px}.toolbar-left{gap:8px}#breadcrumb{max-width:35vw;font-size:10px}.reader-tools{gap:1px}.reader-tools button{font-size:11px;padding:6px}.tool-divider{margin:0 2px}main{padding:28px 22px}.home-top{gap:10px}.edition-mark{font-size:49px}.home-top .page-title{font-size:28px}.page-intro{font-size:13px}.stats{gap:14px}.chapter-grid{gap:9px}.chapter-card{padding:15px;grid-template-columns:19px 1fr 10px;gap:7px}.chapter-card h3{font-size:13px}.chapter-card p{font-size:10px}.chapter-card .num{font-size:15px}.route-strip a{padding:13px}.route-strip h3{font-size:12px}.route-strip p{font-size:10px}.lesson-header .page-title{font-size:27px}.english-block{padding:14px 15px}.lesson-next a{font-size:11px}.site-footer{font-size:9px}#toast{left:50%}.reader-tools #print{display:none}}
@media(max-width:440px){main{padding:24px 17px}.edition-mark{display:none}.route-strip{grid-template-columns:1fr}.route-strip a{border-right:0;border-bottom:1px solid var(--line);display:grid;grid-template-columns:30px 80px 1fr;gap:7px;align-items:center;padding:13px}.route-strip h3{margin:0}.chapter-card{padding:13px 10px}.chapter-card .num{display:none}.chapter-card{grid-template-columns:1fr 10px}.reader-tools #smaller{display:none}.page-title{font-size:26px}.lesson-header .page-title{font-size:25px}.stats{font-size:9px;gap:12px}.english-block{font-size:18px}.page-intro{font-size:12px}}
@media print{.sidebar,.toolbar,.lesson-side,.lesson-actions,.lesson-next,.source-details,.personal-notes,.site-footer,.correction-toggle,.home-actions,.guide,.recite-banner,.skip{display:none!important}.workspace{margin:0}main{padding:0;max-width:none}.lesson-layout{display:block}body{background:white}.text-block,.reciting .text-block{opacity:1!important;font-size:11pt}.english-block{font-size:12pt;border:0;border-left:2px solid #aaa;padding:8px 12px;break-inside:avoid;background:white}.editor-note{background:white;font-size:10pt;break-inside:avoid}figure{break-inside:avoid;max-width:90%;margin:15px auto}figure img{max-height:300px}.block-heading{break-after:avoid}.lesson-header .page-title{font-size:24pt}.table-wrap{overflow:visible}table{font-size:10pt}a{color:inherit}@page{size:A4;margin:16mm}}