:root{color-scheme:light;--ink:#183e32;--muted:#66746d;--line:#dce3d8;--paper:#fffef9;--green:#235a43;--accent:#e9eddb;font-family:Inter,"Segoe UI","Microsoft YaHei","Malgun Gothic",sans-serif;background:#f7f6f0;color:var(--ink)}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}a{color:inherit;text-decoration:none}button,a,select,input{-webkit-tap-highlight-color:transparent}button,select{cursor:pointer}button{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:12px;padding:10px 16px}button:hover{background:var(--accent)}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #b98e31;outline-offset:4px}[hidden]{display:none!important}.skip{position:absolute;top:-100px;padding:12px;background:white;z-index:20}.skip:focus{top:0}.site-header{max-width:1320px;margin:auto;padding:20px 42px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px}.site-header img{width:180px;height:auto;display:block}.header-tools{display:flex;align-items:center;gap:24px;font-size:14px}select{border:1px solid var(--line);border-radius:12px;color:var(--ink);background:var(--paper);padding:12px 14px}
main{max-width:1320px;margin:auto;padding:42px 42px 160px}.intro{display:flex;align-items:center;justify-content:space-between;gap:24px}.eyebrow{font-size:12px;letter-spacing:.12em;color:var(--muted);font-weight:700}h1{font-size:clamp(28px,4vw,43px);letter-spacing:-.04em;margin:12px 0}.intro p:last-child{color:var(--muted);line-height:1.7}.level-label{display:grid;gap:8px;font-size:13px;min-width:180px}.sections{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:30px}.sections a{background:var(--paper);border:1px solid var(--line);border-radius:17px;padding:19px 22px;display:flex;justify-content:space-between;gap:12px;align-items:center;font-weight:650}.sections a span{font-size:12px;font-weight:400}.sections a[aria-current=page]{background:var(--green);color:white;border-color:var(--green)}.scope{font-size:12px;color:var(--muted);line-height:1.6;min-height:20px;margin:14px 0 24px}
.workspace{display:grid;grid-template-columns:270px minmax(0,1fr);gap:30px;align-items:start}.library{background:var(--paper);border:1px solid var(--line);border-radius:20px;padding:18px;position:sticky;top:18px}.library label{font-size:12px;color:var(--muted);display:block;margin-bottom:10px}.library input{padding:12px;width:100%;border:1px solid var(--line);border-radius:10px;background:#f8f9f3;color:var(--ink)}.alphabet{display:flex;flex-wrap:wrap;gap:5px;margin:18px 0 12px}.alphabet button{font-size:12px;padding:6px;min-width:27px;border:0;border-radius:7px}.alphabet button[aria-pressed=true]{color:white;background:var(--green)}.index-meta{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted);border-bottom:1px solid var(--line);padding-bottom:8px}.index-meta button{border:0;font-size:11px;padding:6px}.entries{padding-top:8px;display:grid;gap:4px}.entry-link{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 10px;border-radius:10px;border:1px solid transparent;min-height:44px}.entry-link[aria-current=true]{background:var(--accent);border-color:#ccd8bc}.entry-link .item-word{font-size:18px;overflow-wrap:anywhere}.item-ref{font-size:10px;color:var(--muted);flex-shrink:0}.index-pager{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted);margin-top:12px}.index-pager button{padding:5px 10px}
.learning{min-width:0}.lesson-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding:0 0 15px;margin-bottom:22px}.lesson-toolbar p{margin:0 0 6px;font-size:13px}.lesson-toolbar .reference{font-size:12px;color:var(--muted);line-height:1.7}.lesson-nav{display:flex;gap:8px;flex-shrink:0}.lesson-nav button{font-size:18px;padding:8px 15px}article{background:var(--paper);padding:36px 42px 40px;border:1px solid var(--line);border-radius:24px;box-shadow:0 8px 36px #23463505}.headword{margin-bottom:32px}.headword .hanzi{font-size:40px;font-weight:650}.hanzi{font-size:23px;line-height:1.7;overflow-wrap:anywhere}.pinyin{font-family:"Segoe UI",Arial,sans-serif;font-size:19px;line-height:1.6;color:#936726;overflow-wrap:anywhere}.traditional{font-size:22px;line-height:1.7;color:#516e5b;overflow-wrap:anywhere}.translation{font-size:15px;line-height:1.8;color:#59665e;margin-top:7px;overflow-wrap:anywhere}.headword .translation{font-size:17px}.language-tag{font-size:10px;letter-spacing:.08em;font-weight:600;color:#8a928b;margin-right:10px}.content-section{border-top:1px solid var(--line);padding-top:24px;margin-top:24px}.content-section h2{font-size:13px;letter-spacing:.03em;font-weight:650;color:var(--muted);margin:0 0 18px}.phrase-card{border-radius:14px;background:#f5f6ef;padding:18px 20px;margin-top:12px}.phrase-card:first-child{margin-top:0}.dialogue-row{display:grid;grid-template-columns:24px minmax(0,1fr);gap:14px;padding:18px 0}.dialogue-row+.dialogue-row{border-top:1px dashed var(--line)}.speaker{font-size:12px;color:#789379;font-weight:700;padding-top:9px}.pending{font-size:13px;color:#879087;line-height:1.8}.writing-grid{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}.writing-cell{width:74px;height:74px;border:1px solid #c8d1c0;background:linear-gradient(90deg,transparent calc(50% - .5px),#d8dfd2 50%,transparent calc(50% + .5px)),linear-gradient(transparent calc(50% - .5px),#d8dfd2 50%,transparent calc(50% + .5px));display:grid;place-items:center;font-size:49px;font-family:KaiTi,"STKaiti",serif}.writing-cell.trace{color:#bcc8b8}.empty{padding:70px 24px;text-align:center;color:var(--muted)}#error{padding:24px;background:#fff2e7;border-radius:14px;color:#934e21}.help-dock{position:fixed;right:max(22px,calc((100vw - 1320px)/2 + 42px));bottom:20px;z-index:5;border:1px solid #ccd7c4;border-radius:24px;background:#fffffff5;box-shadow:0 10px 40px #20392b1c;padding:5px 18px 10px}.help-dock #help{display:flex;align-items:center;gap:7px;text-align:left;border:0;background:transparent;padding:0;min-width:200px}.help-dock img{width:94px;height:94px;object-fit:contain}.help-dock strong{display:block;font-size:18px;margin-bottom:5px}.help-dock small{display:block;color:var(--muted);font-size:12px;max-width:175px;line-height:1.5}.help-status{display:flex;justify-content:space-between;align-items:center;gap:12px;color:var(--muted);font-size:11px}.help-status button{padding:3px 8px;border:0;background:none;font-size:11px}.recall-space{padding:16px 0;color:#8e978d;font-size:12px}.hide-chinese .hanzi,.hide-chinese .traditional,.hide-chinese .item-word,.hide-chinese .writing-cell span{visibility:hidden}.hide-chinese .recall-space{display:block}.recall-space{display:none}
footer{max-width:1320px;margin:auto;padding:25px 42px 30px;display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}
@media(max-width:850px){.workspace{grid-template-columns:210px minmax(0,1fr);gap:16px}main{padding:28px 24px 180px}.site-header{padding:17px 24px}article{padding:28px 24px}.sections a{padding:16px}.help-dock{right:20px}.library{padding:14px}}
@media(max-width:620px){.site-header{padding:14px 18px;gap:12px}.site-header img{width:130px}.header-tools{gap:12px;font-size:12px}.header-tools select{padding:8px 6px}.intro{align-items:start;flex-direction:column;gap:8px}.level-label{display:flex;align-items:center;justify-content:space-between;width:100%}.level-label select{min-width:180px}main{padding:22px 16px 190px}.sections{grid-template-columns:repeat(2,1fr);gap:9px;margin-top:22px}.sections a{padding:15px;font-size:15px}.workspace{display:block}.library{position:static;margin-bottom:20px;padding:14px}.entries{grid-template-columns:repeat(3,minmax(0,1fr))}.entry-link{padding:8px 6px;display:block}.entry-link .item-word{font-size:16px;display:block}.item-ref{font-size:9px;display:block;margin-top:4px}.alphabet{margin-top:12px;gap:3px}.alphabet button{padding:5px;min-width:26px}.lesson-toolbar{align-items:start}.lesson-nav{gap:5px}.lesson-nav button{padding:6px 11px}article{padding:26px 20px;border-radius:19px}.headword .hanzi{font-size:34px}.hanzi{font-size:22px}.pinyin{font-size:19px}.phrase-card{padding:15px}.help-dock{right:12px;bottom:12px;padding:2px 13px 7px;border-radius:20px}.help-dock img{width:83px;height:83px}.help-dock #help{min-width:185px}.help-dock strong{font-size:17px}footer{padding:22px 18px;flex-wrap:wrap}.writing-cell{width:62px;height:62px;font-size:43px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
:root{--guardian:#a43f2c;--guardian-soft:#fff0e8;--guardian-reply:#ffdfcc;--guardian-border:#d99073;--guardian-mark:#ffdf9d;--guardian-ink:#55271d}
body[data-level="2"]{--guardian:#30694e;--guardian-soft:#eef7e9;--guardian-reply:#d9edcc;--guardian-border:#86ae78;--guardian-mark:#d4eaaa;--guardian-ink:#244630}
body[data-level="3"]{--guardian:#a34724;--guardian-soft:#fff3e1;--guardian-reply:#ffdfb0;--guardian-border:#dba35c;--guardian-mark:#ffdb8e;--guardian-ink:#5e351e}
body[data-level="4"]{--guardian:#79504b;--guardian-soft:#f5f3ef;--guardian-reply:#ebe1dc;--guardian-border:#b89e92;--guardian-mark:#efcec4;--guardian-ink:#473a38}
body[data-level="5"]{--guardian:#ac372f;--guardian-soft:#fff0e9;--guardian-reply:#ffd8c5;--guardian-border:#df8d71;--guardian-mark:#ffcd92;--guardian-ink:#632a22}
body[data-level="6"]{--guardian:#495e73;--guardian-soft:#f0f3f7;--guardian-reply:#dce5ef;--guardian-border:#8a9db3;--guardian-mark:#f5dfae;--guardian-ink:#293c50}
body[data-level="7"]{--guardian:#3f6553;--guardian-soft:#edf4ee;--guardian-reply:#d9e8d9;--guardian-border:#88a58b;--guardian-mark:#d3e5ad;--guardian-ink:#2c4536}
body[data-level="8"]{--guardian:#206b6a;--guardian-soft:#edf8f5;--guardian-reply:#cdece4;--guardian-border:#78b4aa;--guardian-mark:#b5e5d9;--guardian-ink:#1c4849}
body[data-level="9"]{--guardian:#895720;--guardian-soft:#fff6e7;--guardian-reply:#f5e1ba;--guardian-border:#cba76b;--guardian-mark:#f3d28b;--guardian-ink:#563916}
.grammar-mark{color:var(--guardian-ink);background:var(--guardian-mark);border-bottom:2px solid var(--guardian);border-radius:5px;padding:1px 3px;font-weight:750;box-decoration-break:clone;-webkit-box-decoration-break:clone}
.headword .grammar-mark{padding:2px 7px;border-radius:8px}
.study-mark{font-size:inherit}
.pinyin .study-mark{padding:1px 2px;font-weight:650}
.translation .study-mark{font-size:inherit;font-weight:650;line-height:inherit}
.translation .meaning-mark{background:var(--guardian-soft);color:var(--guardian-ink);border-bottom:1px solid var(--guardian-border);font-weight:500;padding:1px 2px}
.highlight-note{font-size:12px;line-height:1.7;color:var(--muted);margin:-14px 0 24px}
.grammar-examples>h2{display:flex;align-items:center;justify-content:space-between;color:var(--guardian);font-size:15px}
.example-count{font-size:12px;letter-spacing:.08em;color:var(--guardian);background:var(--guardian-soft);border:1px solid var(--guardian-border);padding:5px 10px;border-radius:100px}
.grammar-examples .phrase-card{position:relative;background:var(--guardian-soft);border:1px solid var(--guardian-border);border-left:4px solid var(--guardian);padding:22px 24px 22px 64px;margin-top:16px}
.example-number{position:absolute;left:17px;top:24px;font-size:15px;font-weight:750;color:var(--guardian)}
.dialogue-section>h2{font-size:15px;color:var(--guardian)}
.dialogue-row{grid-template-columns:38px minmax(0,1fr);align-items:start;gap:12px;padding:12px 28px 12px 0}
.dialogue-row+.dialogue-row{border-top:0}
.dialogue-row .speaker{display:grid;place-items:center;width:38px;height:38px;margin-top:8px;padding:0;border-radius:50%;background:var(--guardian);color:white;font-size:14px;box-shadow:0 3px 8px #183e3215}
.speech-bubble{position:relative;min-width:0;border:1px solid var(--guardian-border);border-left:4px solid var(--guardian);background:var(--guardian-soft);border-radius:4px 20px 20px 20px;padding:20px 24px;box-shadow:0 4px 14px #183e3208}
.dialogue-row.reply{grid-template-columns:minmax(0,1fr) 38px;padding:12px 0 12px 28px}
.reply .speaker{grid-column:2;grid-row:1}
.reply .speech-bubble{grid-column:1;grid-row:1;border-left:1px solid var(--guardian-border);border-right:4px solid var(--guardian);background:var(--guardian-reply);border-radius:20px 4px 20px 20px}
.speech-bubble .hanzi,.speech-bubble .traditional{color:var(--guardian-ink)}
.speech-bubble .translation{color:#3d5049}
.help-dock{border-color:var(--guardian-border);background:var(--guardian-soft)}
.help-dock strong{color:var(--guardian)}
@media(max-width:620px){.grammar-examples .phrase-card{padding:45px 16px 20px}.example-number{top:15px;left:17px}.dialogue-row{grid-template-columns:30px minmax(0,1fr);gap:8px;padding-right:8px}.dialogue-row.reply{grid-template-columns:minmax(0,1fr) 30px;padding-left:8px}.dialogue-row .speaker{width:30px;height:30px;font-size:12px}.speech-bubble{padding:17px 15px}.headword .grammar-mark{font-size:30px}}
#browse{display:none}
.dialogue-row{grid-template-columns:84px minmax(0,1fr)}
.dialogue-row.reply{grid-template-columns:minmax(0,1fr) 84px}
.dialogue-row .guardian-speaker{width:84px;height:auto;background:transparent;color:var(--guardian);box-shadow:none;border-radius:0;gap:5px;margin:0;font-size:12px;text-align:center}
.guardian-speaker img{width:84px;height:84px;object-fit:contain;filter:drop-shadow(0 5px 7px #254f3115)}
.help-status{max-width:290px;line-height:1.5}
@media(max-width:620px){.site-header{flex-wrap:wrap}.header-tools{margin-left:auto;flex-wrap:wrap}.dialogue-row{grid-template-columns:56px minmax(0,1fr);padding-right:0}.dialogue-row.reply{grid-template-columns:minmax(0,1fr) 56px;padding-left:0}.dialogue-row .guardian-speaker,.guardian-speaker img{width:56px}.guardian-speaker img{height:56px}.speech-bubble{padding:15px 12px}}
@media(max-width:620px){#browse{display:block;width:100%;text-align:left;border:0;background:transparent;padding:2px 0;font-weight:650}.library:not([data-open])>:not(#browse){display:none}.library[data-open] #browse{margin-bottom:14px}.library{padding:16px 18px}}
@media(max-width:620px){.headword .pinyin .study-mark,.headword .translation .study-mark,.headword .traditional .study-mark{font-size:inherit}.headword .translation .study-mark{padding:1px 3px}}
.phrase .study-mark,.headword .translation .study-mark{padding-inline:0}