[hidden]{display:none!important}
:root{--bg:#f6f5f2;--surface:#fff;--ink:#1f2a37;--muted:#6b7280;--line:#e5e2dc;--accent:#2563eb;--mark:#fde68a;--del:#ef4444;--r:12px;
  --f-ui:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--f-en:"Iowan Old Style","Palatino Linotype",Georgia,serif;--card-h:340px}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#111418;--surface:#1b2027;--ink:#e6e8eb;--muted:#9aa3ad;--line:#2c333c;--accent:#60a5fa;--mark:#854d0e;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#111418;--surface:#1b2027;--ink:#e6e8eb;--muted:#9aa3ad;--line:#2c333c;--accent:#60a5fa;--mark:#854d0e;color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 var(--f-ui);padding-bottom:env(safe-area-inset-bottom)}
button,select,input,textarea{font:inherit;color:inherit}
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:5;display:flex;align-items:center;gap:8px;padding-block:8px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));background:var(--bg);border-bottom:1px solid var(--line)}
.top h1{flex:1;font-size:1.05rem;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.icon-btn{border:1px solid var(--line);background:var(--surface);border-radius:10px;min-width:38px;height:38px;font-size:1.1rem;cursor:pointer}
.net{font-size:.75rem;color:#fff;background:#b45309;border-radius:999px;padding:0 8px}
.net:empty{display:none}
.view{padding-block:12px 40px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));max-width:1400px;margin:0 auto}
.hint,.small{color:var(--muted);font-size:.85rem}
.dk-group h2{font-size:1rem;margin:18px 0 8px}
.dk-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.deck{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px;text-decoration:none;color:inherit}
.deck:hover{border-color:var(--accent)}
.dk-kind{font-size:.75rem;color:var(--muted)}.dk-t{font-weight:600;margin:2px 0}.dk-s{font-family:var(--f-en);color:var(--muted)}.dk-n{font-size:.82rem;margin-top:6px}
.toolbar{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}
.toolbar .row{display:flex;gap:8px;flex-wrap:wrap}
.toolbar select,.toolbar input{flex:1;min-width:150px;height:38px;border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:0 10px}
.seg{display:flex;flex-wrap:wrap;gap:4px}
.seg button,.chip{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:5px 14px;cursor:pointer;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{padding:3px 10px;font-size:.85rem}
.chip[aria-pressed="true"]{background:var(--c);border-color:var(--c);color:#fff}
.stats{font-size:.82rem;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);height:var(--card-h);cursor:pointer;overflow:hidden}
.card .face{position:absolute;inset:0;padding:12px 14px;overflow-y:auto;scrollbar-width:thin;overscroll-behavior:contain}
.card .face::-webkit-scrollbar{width:6px}.card .face::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px}
.card .bface{display:none}.card.flipped .bface{display:block}.card.flipped .fface{display:none}
.card.flipped{border-color:var(--accent)}
.card.big{height:auto;min-height:60vh;cursor:default}
.card.big .face{position:static;max-height:none}
.card.done{height:auto;padding:24px;cursor:default}
.meta{display:flex;flex-wrap:wrap;align-items:center;gap:6px;font-size:.75rem;margin-bottom:8px}
.ttag{background:var(--c);color:#fff;border-radius:6px;padding:1px 7px}
.mtag{border:1px solid var(--line);border-radius:6px;padding:0 6px;color:var(--muted)}
.where{margin-left:auto;color:var(--muted);font-family:ui-monospace,monospace}
.front-main{font-family:var(--f-en);font-size:1.35rem;line-height:1.35;margin:18px 0 6px}
.sub{color:var(--muted);font-size:.95rem}
.back-head{font-family:var(--f-en);font-size:1.05rem;font-weight:600;margin-bottom:6px}
.f{margin:8px 0;padding-top:6px;border-top:1px dashed var(--line)}
.fl{font-size:.72rem;color:var(--muted);display:flex;align-items:center;gap:6px;margin-bottom:2px}
.fv{font-size:.92rem}
.f-src .fv,.f-en .fv,.f-say .fv{font-family:var(--f-en);font-size:.98rem}
.act{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.aud,.links{display:flex;gap:6px;flex-wrap:wrap}
.pill{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:3px 10px;font-size:.8rem;text-decoration:none;color:var(--ink);cursor:pointer}
.pill.sm{padding:0 7px;font-size:.72rem}
.pill.on{background:var(--accent);color:#fff;border-color:var(--accent)}
.pill:disabled{opacity:.4}
body.offline .online-only{display:none}
.shadow{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0;padding:8px;border-radius:10px;background:var(--bg)}
.listen-front{text-align:center;padding-top:20px}
.big-play{width:84px;height:84px;border-radius:50%;border:0;background:var(--accent);color:#fff;font-size:2rem;cursor:pointer}
.dict{width:100%;margin-top:10px;border:1px solid var(--line);border-radius:10px;background:var(--bg);padding:8px;font-family:var(--f-en)}
mark{background:var(--mark);color:inherit;border-radius:3px}
del{color:var(--del)}
.review-ctl{position:sticky;bottom:0;display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;padding:12px 0 calc(12px + env(safe-area-inset-bottom));background:var(--bg)}
.review-ctl button{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:8px 16px;cursor:pointer;display:flex;flex-direction:column;align-items:center;min-width:76px}
.review-ctl .primary{background:var(--ink);color:var(--surface);flex-direction:row;gap:8px}
.review-ctl small{font-size:.72rem;color:var(--muted)}
.rate.r1{border-color:#ef4444}.rate.r2{border-color:#f59e0b}.rate.r3{border-color:#22c55e}.rate.r4{border-color:#3b82f6}
kbd{font-size:.65rem;color:var(--muted);border:1px solid var(--line);border-radius:4px;padding:0 4px}
@media (hover:none){kbd{display:none}}
.more{text-align:center;color:var(--muted);font-size:.85rem;padding:16px}
dialog{border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);max-width:min(440px,92vw);padding:0}
dialog::backdrop{background:rgba(0,0,0,.45)}
dialog{max-height:min(86vh,720px);overflow-y:auto;overscroll-behavior:contain}
.dlg-head{display:flex;align-items:center;justify-content:space-between;gap:8px;position:sticky;top:-16px;background:var(--surface);margin:-16px -18px 0;padding:12px 18px 8px;z-index:1}
body.dlg-open{overflow:hidden}
.settings{padding:16px 18px;display:flex;flex-direction:column;gap:10px}
.settings h2{margin:0;font-size:1.1rem}.settings h3{margin:4px 0;font-size:.9rem}
.settings label{display:flex;justify-content:space-between;align-items:center;gap:10px}
.settings select,.settings input[type=number]{border:1px solid var(--line);border-radius:8px;background:var(--bg);padding:4px 8px;width:9em}
.set-group{display:flex;flex-direction:column;gap:6px;border-top:1px solid var(--line);padding-top:8px}
.set-group button,.btn{border:1px solid var(--line);background:var(--bg);border-radius:10px;padding:7px 12px;cursor:pointer;text-align:center;text-decoration:none;color:var(--ink);font-size:.9rem}
.set-group label.btn{justify-content:center}
.settings label.small{justify-content:flex-start;gap:6px}
.danger{color:#dc2626}
menu{display:flex;justify-content:flex-end;padding:0;margin:4px 0 0}
menu button{border:0;background:var(--ink);color:var(--surface);border-radius:10px;padding:7px 18px;cursor:pointer}
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:var(--surface);padding:8px 16px;border-radius:10px;z-index:20;font-size:.9rem}
.katex{font-size:1.02em}
@media (max-width:520px){.grid{grid-template-columns:1fr}.front-main{font-size:1.2rem}:root{--card-h:300px}}
.katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0;margin:.4em 0}
.front-main .katex-display{font-size:.82em}