:root{--bg:#fbf7f0;--card:#fff;--ink:#2b2b2b;--accent:#b03a2e;--muted:#8a8175;--line:#ece3d6;--grid:#e0d3be}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:760px;margin:0 auto;padding:0 16px 40px}
.bc{font-size:13px;color:var(--muted);padding:14px 0 6px;word-break:break-all}
.bc a{color:var(--muted)}
.hero{display:flex;gap:18px;align-items:center;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:16px;margin:10px 0 14px}
.gbox{flex:0 0 auto;width:132px;height:132px;border:2px solid var(--grid);border-radius:14px;position:relative;background:#fffdf9}
.gbox:before,.gbox:after{content:"";position:absolute;background:var(--grid)}
.gbox:before{left:50%;top:6%;bottom:6%;width:1px;border-left:1px dashed var(--grid);background:none}
.gbox:after{top:50%;left:6%;right:6%;height:1px;border-top:1px dashed var(--grid);background:none}
.gbox b{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-family:"KaiTi","STKaiti","Kaiti SC",serif;font-size:92px;color:var(--accent);font-weight:400}
h1{font-size:20px;margin:0 0 6px;line-height:1.4}
.py{font-size:24px;color:var(--accent);font-weight:700;margin:0 0 2px;letter-spacing:.5px}
.meta{font-size:13px;color:var(--muted);margin:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px 16px;margin-bottom:14px}
.card h2{font-size:16px;margin:0 0 10px;padding-left:9px;border-left:3px solid var(--accent);line-height:1.2}
.bsrow{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap}
#bsw{width:200px;height:200px;flex:0 0 auto;background:#fffdf9;border:1px solid var(--line);border-radius:12px}
.bsside{flex:1;min-width:200px}
.btns{display:flex;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.btns button{flex:1;min-width:88px;padding:9px 10px;font-size:14px;border-radius:10px;border:1px solid var(--accent);background:#fff;color:var(--accent);cursor:pointer;font-family:inherit}
.btns button.solid{background:var(--accent);color:#fff}
.btns button:disabled{opacity:.5;cursor:default}
ol.st{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0;padding:0;counter-reset:s}
ol.st li{counter-increment:s;font-size:13px;color:var(--ink);background:#f7f1e7;border-radius:8px;padding:3px 8px 3px 6px}
ol.st li:before{content:counter(s);display:inline-block;min-width:15px;height:15px;line-height:15px;text-align:center;font-size:10px;color:#fff;background:var(--accent);border-radius:50%;margin-right:5px;vertical-align:1px}
.lead{font-size:14px;color:#4a4a4a;margin:0 0 12px}
.vbox{position:relative;background:#111;border-radius:12px;aspect-ratio:16/9;display:flex;align-items:center;justify-content:center;overflow:hidden}
.vbox video{width:100%;height:100%;display:block;border-radius:12px;background:#000}
.vplay{border:0;background:transparent;color:#fff;display:flex;flex-direction:column;align-items:center;gap:8px;cursor:pointer;font-family:inherit}
.vplay i{width:58px;height:58px;border-radius:50%;background:rgba(255,255,255,.92);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:22px;font-style:normal;box-shadow:0 4px 14px rgba(0,0,0,.3)}
.vplay em{font-style:normal;font-size:14px;letter-spacing:.5px}
.gate{padding:22px 16px;text-align:center;color:#f3e9dc}
.gate p{margin:0 0 12px;font-size:14px;color:#d8cfc4}
.gate a{display:inline-block;padding:10px 22px;background:var(--accent);color:#fff;border-radius:9px;font-size:15px;font-weight:600}
.gate a:hover{text-decoration:none;opacity:.92}
.vhint{font-size:12px;color:var(--muted);margin:9px 0 0}
.words{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.words li{background:#f7f1e7;border-radius:8px;padding:4px 10px;font-size:14px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{display:inline-block;min-width:42px;text-align:center;padding:6px 9px;background:#f7f1e7;border:1px solid transparent;border-radius:9px;font-size:19px;color:var(--ink);font-family:"KaiTi","STKaiti",serif}
.chips a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.chips a.me{background:var(--accent);color:#fff}
.lesson{font-size:13px;color:var(--muted);margin:-4px 0 10px}
footer{text-align:center;font-size:12px;color:var(--muted);padding:18px 0 0}
footer a{color:var(--muted)}
.idx-group{margin-bottom:18px}
.idx-group h3{font-size:15px;margin:0 0 8px;color:var(--accent)}
.idx-group .chips a{font-size:17px;min-width:38px;padding:4px 7px}
.letter{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px;padding:0;list-style:none}
.letter a{display:inline-block;padding:7px 12px;background:#fff;border:1px solid var(--line);border-radius:10px;font-size:15px;color:var(--ink)}
.letter a b{color:var(--accent);font-weight:700}
@media(max-width:420px){
  .hero{gap:12px;padding:13px}
  .gbox{width:104px;height:104px}
  .gbox b{font-size:72px}
  .py{font-size:21px}
  h1{font-size:17px}
  #bsw{width:100%;height:220px}
}
@media(min-width:900px){
  .wrap{max-width:820px}
}