:root{
  --bg:#f6f7fb;--card:#fff;--ink:#111827;--mute:#6b7280;--line:#e5e7eb;--brand:#1e3a8a;--brand2:#2563eb;
  --fall:#2563eb;--rise:#ea580c;--level:#16a34a;--fallrise:#7c3aed;--risefall:#db2777;
  --fall-bg:#dbeafe;--rise-bg:#ffedd5;--level-bg:#dcfce7;--fallrise-bg:#ede9fe;--risefall-bg:#fce7f3;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,sans-serif}
a{color:var(--brand2);text-decoration:none}
button{font:inherit;cursor:pointer}
.top{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:16px;padding:8px 16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:8px;color:var(--ink)}
.brand b{font-size:19px;color:var(--brand)}
.brand small{color:var(--mute);font-size:12px}
.logo svg path{fill:none;stroke-width:3;stroke-linecap:round}
.logo .f{stroke:var(--fall)}.logo .r{stroke:var(--rise)}.logo .l{stroke:var(--level)}
.ctrl{margin-left:auto;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.seg{display:inline-flex;border:1px solid var(--brand2);border-radius:999px;overflow:hidden}
.seg button{border:0;background:#fff;color:var(--brand2);padding:4px 12px;font-size:13px}
.seg button.on{background:var(--brand2);color:#fff}
.chk{font-size:13px;color:#374151;display:flex;align-items:center;gap:4px;cursor:pointer}
main{max-width:1180px;margin:0 auto;padding:16px}
.loading{padding:60px;text-align:center;color:var(--mute)}
.foot{max-width:1180px;margin:30px auto;padding:0 16px 30px;color:var(--mute);font-size:12px}
#player{position:fixed;left:-9999px;top:-9999px;width:1px;height:1px}
.card .player-box #player{position:static;width:100%;max-width:640px;height:auto;max-height:360px;background:#000;border-radius:8px;display:block}

/* ---- 首页 ---- */
.hero{background:linear-gradient(135deg,#1e3a8a,#2563eb);color:#fff;border-radius:14px;padding:22px 24px;margin-bottom:16px}
.hero h1{margin:0 0 6px;font-size:24px}
.hero p{margin:0;opacity:.92;max-width:900px}
.hero .nums{margin-top:10px;font-size:13px;opacity:.85}
details.intro{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:0 18px;margin-bottom:16px}
details.intro summary{cursor:pointer;padding:12px 0;font-weight:600;color:var(--brand)}
details.intro .body{padding:0 0 16px;display:grid;grid-template-columns:1fr 1fr;gap:16px}
details.intro h3{margin:8px 0 4px;font-size:15px}
details.intro p,details.intro li{margin:0 0 6px;font-size:14px;color:#374151}
details.intro ul{padding-left:18px;margin:0}
.tonetab{width:100%;border-collapse:collapse;font-size:14px}
.tonetab th,.tonetab td{border-bottom:1px solid var(--line);padding:6px 6px;text-align:left;vertical-align:top}
.tonetab svg{vertical-align:middle}
.filters{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin:10px 0 14px}
.filters .grp{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.filters .grp > span{font-size:13px;color:var(--mute)}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:3px 11px;font-size:13px;color:#374151}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.chip.t-fall.on{background:var(--fall);border-color:var(--fall)}
.chip.t-rise.on{background:var(--rise);border-color:var(--rise)}
.chip.t-level.on{background:var(--level);border-color:var(--level)}
.chip.t-fallrise.on{background:var(--fallrise);border-color:var(--fallrise)}
.chip.t-risefall.on{background:var(--risefall);border-color:var(--risefall)}
.filters select,.filters input{font:inherit;font-size:13px;padding:4px 8px;border:1px solid var(--line);border-radius:8px;background:#fff}
.filters input{min-width:200px}
.gtitle{margin:18px 0 8px;font-size:17px;color:var(--brand);display:flex;align-items:baseline;gap:10px}
.gtitle small{color:var(--mute);font-weight:400;font-size:13px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:12px}
.kpcard{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 14px 12px;display:flex;flex-direction:column;gap:6px;color:var(--ink);transition:box-shadow .15s,transform .15s}
.kpcard:hover{box-shadow:0 6px 18px rgba(30,58,138,.12);transform:translateY(-1px)}
.kpcard .h{display:flex;align-items:center;gap:8px}
.kpcard .h b{font-size:15px;flex:1}
.kpcard .short{font-size:13px;color:#4b5563;margin:0}
.kpcard .meta{font-size:12px;color:var(--mute);display:flex;gap:10px}
.badge{display:inline-flex;align-items:center;gap:4px;border-radius:6px;padding:1px 7px;font-size:12px;font-weight:600;white-space:nowrap}
.badge.fall{background:var(--fall-bg);color:var(--fall)}
.badge.rise{background:var(--rise-bg);color:var(--rise)}
.badge.level{background:var(--level-bg);color:var(--level)}
.badge.fallrise{background:var(--fallrise-bg);color:var(--fallrise)}
.badge.risefall{background:var(--risefall-bg);color:var(--risefall)}
.contour{display:inline-block;vertical-align:middle}
.contour path{fill:none;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.contour.fall path{stroke:var(--fall)}.contour.rise path{stroke:var(--rise)}.contour.level path{stroke:var(--level)}
.contour.fallrise path{stroke:var(--fallrise)}.contour.risefall path{stroke:var(--risefall)}
.overview{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin-top:22px}
.overview h2{font-size:17px;margin:4px 0 8px;color:var(--brand)}
.ovtab{width:100%;border-collapse:collapse;font-size:13.5px}
.ovtab th,.ovtab td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
.ovtab th{color:var(--mute);font-weight:600;font-size:12px}
.ovtab tr:hover td{background:#f9fafb}
.ovtab td.g{color:var(--mute);white-space:nowrap}
.empty{padding:30px;text-align:center;color:var(--mute)}

/* ---- 知识点详情 ---- */
.back{display:inline-block;margin-bottom:8px;font-size:14px}
.kphead{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin-bottom:14px}
.kphead h1{margin:0 0 6px;font-size:22px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.kphead .short{margin:0 0 12px;color:#374151;font-size:15px}
.explain{display:grid;grid-template-columns:1fr 1fr;gap:10px 22px}
.explain div{font-size:14px;color:#374151}
.explain b{display:block;color:var(--brand);font-size:13px;margin-bottom:2px}
.explain .wide{grid-column:1/-1}
.exfilters{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin:8px 0 12px;font-size:13px}
.exfilters select,.exfilters input{font:inherit;font-size:13px;padding:4px 8px;border:1px solid var(--line);border-radius:8px;background:#fff}
.exfilters .cnt{color:var(--mute)}
.list{display:flex;flex-direction:column;gap:12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px 12px}
.card .toprow{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--mute);margin-bottom:6px;flex-wrap:wrap}
.card .toprow .lv{background:#eef2ff;color:#3730a3;border-radius:6px;padding:0 6px;font-weight:600}
.card .toprow .idx{margin-left:auto}
.sent{display:flex;flex-wrap:wrap;align-items:flex-end;gap:2px 0;margin:2px 0 4px}
.unit{display:inline-flex;flex-wrap:wrap;align-items:flex-end;gap:0 2px;padding:4px 6px 4px 2px;border-radius:8px;position:relative}
.unit.sentstart{margin-left:10px}
.unit .ut{display:inline-flex;flex-direction:column;align-items:center;justify-content:flex-end;margin-left:4px;padding:0 4px;font-size:12px;font-weight:700;align-self:flex-end;line-height:1.2}
.unit .ut .contour{display:block}
.sep{align-self:center;color:#cbd5e1;font-size:22px;padding:0 4px;line-height:1;margin-bottom:14px}
.tok{display:inline-flex;flex-direction:column;align-items:center;padding:0 3px;border-radius:6px;line-height:1.25;min-width:0}
.tok .w{font-size:21px;font-weight:500;letter-spacing:.1px;white-space:nowrap}
.tok .ipa{font-size:12.5px;color:#475569;font-family:"Charis SIL","Doulos SIL","Gentium Plus","Lucida Sans Unicode","Segoe UI","Arial Unicode MS",sans-serif;white-space:nowrap;min-height:16px}
.tok .ipa:empty::before{content:"";}
.tok.nuc .w{font-weight:800}
.tok.nuc.fall .w{color:var(--fall)}.tok.nuc.rise .w{color:var(--rise)}.tok.nuc.level .w{color:var(--level)}
.tok.nuc.fallrise .w{color:var(--fallrise)}.tok.nuc.risefall .w{color:var(--risefall)}
.tok.nuc.fall{background:var(--fall-bg)}.tok.nuc.rise{background:var(--rise-bg)}.tok.nuc.level{background:var(--level-bg)}
.tok.nuc.fallrise{background:var(--fallrise-bg)}.tok.nuc.risefall{background:var(--risefall-bg)}
.tok.tail .w{color:#94a3b8;font-weight:400}
.tok.key .w{text-decoration:underline;text-decoration-color:#f59e0b;text-decoration-thickness:3px;text-underline-offset:4px}
.tok.now{outline:2px solid #f59e0b;outline-offset:-1px}
body.hide-ipa .tok .ipa{display:none}
body.hide-zh .zh{display:none}
.zh{color:#374151;font-size:14px;margin:2px 0 6px}
.notes{font-size:12.5px;color:var(--mute);margin:0 0 6px}
.notes .alt{color:var(--rise)}
.wordbox{display:flex;align-items:baseline;gap:12px;margin:0 0 6px;font-size:14px;flex-wrap:wrap}
.wordbox b{font-size:22px;color:var(--brand)}
.wordbox .ipa{font-family:"Charis SIL","Doulos SIL","Gentium Plus","Segoe UI",sans-serif;color:#334155}
.wordbox .ipa i{font-style:normal;color:var(--mute);font-size:12px;margin-right:4px}
.clips{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.clip{border:1px solid var(--line);background:#f9fafb;border-radius:999px;padding:3px 10px 3px 8px;font-size:13px;color:#1f2937;display:inline-flex;align-items:center;gap:6px;max-width:100%}
.clip:hover{background:#eef2ff;border-color:#c7d2fe}
.clip.playing{background:#1e3a8a;color:#fff;border-color:#1e3a8a}
.clip .tri{width:0;height:0;border-left:8px solid currentColor;border-top:5px solid transparent;border-bottom:5px solid transparent}
.clip .m{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:260px}
.acc{font-size:11px;border-radius:4px;padding:0 4px;font-weight:700}
.acc.us{background:#dbeafe;color:#1d4ed8}.acc.uk{background:#fee2e2;color:#b91c1c}
.clip.playing .acc{background:rgba(255,255,255,.25);color:#fff}
.speak{border:1px solid var(--line);background:#fff;border-radius:999px;padding:3px 10px;font-size:13px;color:#374151}
.player-box{margin:10px 0 4px}
.more{display:block;margin:16px auto;padding:8px 22px;border-radius:999px;border:1px solid var(--brand2);background:#fff;color:var(--brand2)}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12.5px;color:var(--mute);margin:0 0 10px}
.legend .tok{display:inline-flex;vertical-align:middle}
.legend .tok .w{font-size:14px}

@media (max-width:760px){
  .top{padding:8px 10px;gap:8px}
  .brand small{display:none}
  .ctrl{margin-left:0;width:100%;gap:8px}
  main{padding:10px}
  .hero{padding:16px}
  .hero h1{font-size:20px}
  details.intro .body,.explain{grid-template-columns:1fr}
  .tok .w{font-size:18px}
  .tok .ipa{font-size:11.5px}
  .card{padding:10px 10px 8px}
  .ovtab td.g{white-space:normal}
  .filters input{min-width:140px;flex:1}
}