:root{
  --paper:#f6f4ef; --card:#fffdf9; --ink:#24282b; --sub:#5f6468; --faint:#8d9195;
  --line:#e2ded5; --line2:#cfcabf; --accent:#2f4f6f; --accent-ink:#f6f4ef; --accent-soft:#e6ecf1;
  --ok:#4f6f52; --warn:#9a6b2f; --bad:#9b4a4a;
  --m-vocab:#f1e4bd; --m-chars:#efd9cb; --m-length:#d9e4ec; --m-tone:#e7dbe4; --m-format:#dde6d6;
  --radius:6px;
  --sans:"Noto Sans TC","PingFang TC","Hiragino Sans","Microsoft JhengHei","Heiti TC",system-ui,sans-serif;
  --serif:"Noto Serif TC","Source Han Serif TC","Hiragino Mincho ProN","Songti TC","PMingLiU",serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.85 var(--sans);letter-spacing:.02em}
a{color:var(--accent);text-underline-offset:3px}
.wrap{max-width:1120px;margin:0 auto;padding:0 28px}
button,select,textarea{font:inherit;color:inherit}

header.site{border-bottom:1px solid var(--line);background:var(--paper)}
.head{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-family:var(--serif);font-size:20px;letter-spacing:.12em}
.brand .mark{display:inline-grid;place-items:center;width:30px;height:30px;border:1px solid var(--accent);color:var(--accent);border-radius:4px;font-size:16px;letter-spacing:0}
nav{display:flex;gap:24px;font-size:15px}
nav a{color:var(--sub);text-decoration:none}
nav a:hover{color:var(--accent)}

.intro{padding:56px 0 28px}
h1{font-family:var(--serif);font-weight:500;font-size:34px;line-height:1.5;letter-spacing:.08em;margin:0 0 14px}
.lead{color:var(--sub);max-width:46em;margin:0}
.lead.small{font-size:16px;margin-bottom:20px}

.steps{list-style:none;display:flex;gap:0;padding:0;margin:8px 0 28px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.steps li{flex:1;padding:14px 0;color:var(--faint);font-size:15px;display:flex;align-items:center;gap:10px;cursor:default}
.steps li span{display:inline-grid;place-items:center;width:24px;height:24px;border:1px solid var(--line2);border-radius:50%;font-size:13px}
.steps li.on{color:var(--ink)}
.steps li.on span{border-color:var(--accent);background:var(--accent);color:var(--accent-ink)}
.steps li.done{color:var(--sub);cursor:pointer}
.steps li.done span{border-color:var(--accent);color:var(--accent)}

.panel{padding-bottom:48px}
.inputbar{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:14px}
.field{display:flex;flex-direction:column;gap:4px;font-size:14px;color:var(--sub)}
.field.inline{flex-direction:row;align-items:center;gap:8px}
select{appearance:none;background:var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%238d9195'/%3E%3C/svg%3E") no-repeat right 12px center;border:1px solid var(--line2);border-radius:var(--radius);padding:8px 34px 8px 12px;font-size:16px;color:var(--ink);min-width:220px}
textarea{width:100%;background:var(--card);border:1px solid var(--line2);border-radius:var(--radius);padding:16px 18px;font-size:17px;line-height:1.9;resize:vertical}
textarea:focus,select:focus,button:focus-visible,[contenteditable]:focus{outline:2px solid var(--accent);outline-offset:2px}
.row{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:14px;flex-wrap:wrap}
.note{color:var(--faint);font-size:14px;margin:0;line-height:1.7}
button{cursor:pointer;border-radius:var(--radius);padding:10px 22px;font-size:16px;letter-spacing:.06em}
button.primary{background:var(--accent);color:var(--accent-ink);border:1px solid var(--accent)}
button.primary:hover{background:#264260}
button.primary:disabled{opacity:.5;cursor:wait}
button.ghost{background:transparent;border:1px solid var(--line2);color:var(--ink)}
button.ghost:hover{border-color:var(--accent);color:var(--accent)}

.result{margin-top:36px;border-top:1px solid var(--line);padding-top:28px}
.grid{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:40px}
h2.sec,h3.sec{font-size:15px;font-weight:600;letter-spacing:.1em;color:var(--sub);margin:0 0 12px}
h2.sec small,h3.sec small{font-weight:400;color:var(--faint);letter-spacing:.04em;margin-left:8px}
h3.sec{margin-top:28px}
.marked{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;white-space:pre-wrap;line-height:2.1;font-size:17px;max-height:620px;overflow:auto}
.marked mark{background:transparent;color:inherit;border-radius:2px;cursor:pointer;padding:1px 0}
.marked mark.vocab{background:var(--m-vocab)} .marked mark.chars{background:var(--m-chars)}
.marked mark.tone{background:var(--m-tone)} .marked mark.format{background:var(--m-format)}
.marked .sent-long{background-image:linear-gradient(var(--m-length),var(--m-length));background-size:100% .45em;background-position:0 92%;background-repeat:no-repeat}
.marked mark.sel{outline:2px solid var(--accent);outline-offset:1px}
.legend{display:flex;flex-wrap:wrap;gap:16px;margin-top:10px;font-size:13px;color:var(--sub)}
.legend i{display:inline-block;width:14px;height:10px;border-radius:2px;margin-right:6px;vertical-align:middle}

.scorecard{border:1px solid var(--line);background:var(--card);border-radius:var(--radius);padding:20px 22px}
.score-top{display:flex;align-items:baseline;gap:14px}
.score-num{font-family:var(--serif);font-size:56px;line-height:1;letter-spacing:0}
.score-of{color:var(--faint);font-size:14px}
.score-grade{margin-left:auto;text-align:right}
.score-grade b{display:block;font-family:var(--serif);font-size:28px;font-weight:500;color:var(--accent)}
.score-grade span{font-size:13px;color:var(--sub)}
.dims{margin:16px 0 0;padding:0;list-style:none}
.dims li{display:grid;grid-template-columns:3.2em 1fr 3em;align-items:center;gap:10px;font-size:14px;padding:5px 0;cursor:default}
.bar{height:6px;background:var(--line);border-radius:3px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--accent);border-radius:3px}
.dims li em{font-style:normal;text-align:right;color:var(--sub);font-variant-numeric:tabular-nums}
.dims li small{grid-column:2/4;color:var(--faint);font-size:12.5px;line-height:1.5;margin-top:-2px}

.detail{margin-top:16px;border-left:2px solid var(--accent);padding:4px 0 4px 16px;font-size:15px;display:none}
.detail.show{display:block}
.detail .ref{font-size:12.5px;color:var(--faint)}
.detail .plain{margin-top:6px}
.detail .plain b{background:var(--accent-soft);padding:1px 6px;border-radius:3px;font-weight:500}

.issues{display:flex;flex-direction:column;gap:2px;max-height:360px;overflow:auto}
.issue{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px dashed var(--line);font-size:15px;cursor:pointer}
.issue:hover{color:var(--accent)}
.issue .cnt{color:var(--faint);font-size:13px;white-space:nowrap}
.issue .chip{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:8px;vertical-align:middle}

.next{display:flex;align-items:center;gap:16px;margin-top:28px;flex-wrap:wrap}

.status{padding:18px 0;color:var(--sub)}
.status .spin{display:inline-block;width:14px;height:14px;border:2px solid var(--line2);border-top-color:var(--accent);border-radius:50%;animation:spin 1s linear infinite;vertical-align:-2px;margin-right:10px}
@keyframes spin{to{transform:rotate(360deg)}}
.status .src{font-size:13px;color:var(--faint);margin-left:8px}

.rwlines{list-style:none;padding:0;margin:0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.rwlines li{display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:center;padding:10px 16px;border-bottom:1px solid var(--line)}
.rwlines li:last-child{border-bottom:0}
.rwlines img{width:44px;height:44px;object-fit:contain;opacity:.95}
.rwlines .t{outline:none;border-radius:3px;padding:2px 4px;font-size:17px}
.rwlines .t:hover{background:var(--paper)}
.rwlines li.imp .t{font-weight:600}
.terms,.dropped{margin-top:18px;font-size:15px}
.terms h4,.dropped h4{font-size:14px;color:var(--sub);margin:0 0 6px;font-weight:600;letter-spacing:.08em}
.terms dl{margin:0}.terms dt{font-weight:600;margin-top:6px}.terms dd{margin:0 0 4px;color:var(--sub)}
.dropped ul{margin:0;padding-left:1.2em;color:var(--sub)}

.compare{display:flex;align-items:center;gap:18px;border:1px solid var(--line);background:var(--card);border-radius:var(--radius);padding:18px 22px}
.compare .from,.compare .to{text-align:center}
.compare .n{font-family:var(--serif);font-size:42px;line-height:1.1}
.compare .from .n{color:var(--faint)}
.compare .g{font-size:13px;color:var(--sub)}
.compare .arrow{color:var(--line2);font-size:22px}
.compare .delta{margin-left:auto;font-size:14px;color:var(--ok)}
.facts{display:flex;flex-direction:column;gap:0;font-size:15px}
.fact{display:flex;gap:10px;align-items:baseline;padding:7px 0;border-bottom:1px dashed var(--line)}
.fact .k{font-size:12.5px;color:var(--faint);width:3em;flex:none}
.fact .s{margin-left:auto;font-size:13px;white-space:nowrap}
.fact.ok .s{color:var(--ok)} .fact.miss .s{color:var(--bad)} .fact.add .s{color:var(--warn)}
.fact.miss{background:#f6e9e6}
.factsum{font-size:14px;margin:6px 0 10px;color:var(--sub)}

.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:18px}
.easy{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:40px 44px;max-width:820px}
.easy h2{font-size:26px;font-weight:700;margin:0 0 26px;letter-spacing:.06em;line-height:1.5}
.easy .ln{display:grid;grid-template-columns:96px 1fr 40px;gap:22px;align-items:center;padding:12px 0;border-bottom:1px solid #efece6}
.easy .ln:last-child{border-bottom:0}
.easy .pic{width:96px;height:96px;display:grid;place-items:center;border:1px solid #eeebe5;border-radius:8px;background:#fff;cursor:pointer;padding:0}
.easy .pic img{width:84px;height:84px;object-fit:contain}
.easy .pic.empty{border-style:dashed;color:var(--faint);font-size:12px}
.easy .txt{font-size:22px;line-height:1.75;letter-spacing:.04em}
.easy .ln.imp .txt{font-weight:700}
.easy .say{width:36px;height:36px;padding:0;border:1px solid var(--line2);border-radius:50%;background:#fff;display:grid;place-items:center}
.easy .say svg{width:14px;height:14px;fill:var(--accent)}
.easy .ln.speaking{background:var(--accent-soft)}
.easy .gloss{margin-top:22px;padding-top:16px;border-top:1px solid var(--line)}
.easy .gloss p{font-size:19px;margin:6px 0}
.credit{font-size:12.5px;color:var(--faint);margin-top:10px}

.quiz{display:flex;flex-direction:column;gap:16px;max-width:820px}
.q{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px}
.q .qt{font-size:19px;font-weight:600;margin:0 0 8px}
.q ol{margin:0 0 12px;padding-left:1.4em;color:var(--sub)}
.q ol li.ans{color:var(--ink);font-weight:600}
.q .tally{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.q .tally span{font-size:14px;color:var(--sub);margin-left:6px}
.quizsum{margin-top:18px;font-size:17px;max-width:820px}
.quizsum b{font-family:var(--serif);font-size:28px;font-weight:500}
.quizsum .pass{color:var(--ok)} .quizsum .fail{color:var(--bad)}

dialog{border:1px solid var(--line2);border-radius:10px;padding:0;max-width:760px;width:92vw;background:var(--card);color:var(--ink)}
dialog::backdrop{background:rgba(36,40,43,.35)}
.pick{padding:22px}
.pick h3{margin:0 0 12px;font-size:17px}
.pickgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(88px,1fr));gap:8px;max-height:60vh;overflow:auto}
.pickgrid button{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 4px;border:1px solid var(--line);background:#fff;font-size:13px;letter-spacing:0}
.pickgrid img{width:56px;height:56px;object-fit:contain}

footer.site{border-top:1px solid var(--line);padding:28px 0 40px;color:var(--faint);font-size:13.5px}
footer.site p{margin:4px 0}

/* 說明頁 */
.doc{max-width:780px;padding:48px 0 64px}
.doc h1{font-size:30px}
.doc h2{font-family:var(--serif);font-weight:500;font-size:22px;letter-spacing:.06em;margin:44px 0 12px;padding-top:20px;border-top:1px solid var(--line)}
.doc table{width:100%;border-collapse:collapse;font-size:15px;margin:12px 0}
.doc th,.doc td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.doc th{font-weight:600;color:var(--sub);font-size:14px}
.doc td.n{text-align:right;font-variant-numeric:tabular-nums}
.doc code{font-size:14px;background:var(--card);border:1px solid var(--line);padding:1px 6px;border-radius:3px}
.bench td.up{color:var(--ok);font-weight:600}
.bench .bar2{display:inline-block;height:6px;background:var(--line2);border-radius:3px;vertical-align:middle}
.bench .bar2.after{background:var(--accent)}

@media (max-width:860px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .intro{padding:36px 0 18px}
  h1{font-size:25px}
  nav{gap:14px;font-size:14px}
  .grid{grid-template-columns:1fr;gap:28px}
  .steps li{font-size:13px;gap:6px;justify-content:center}
  .steps li span{width:20px;height:20px;font-size:12px}
  select{min-width:0;width:100%}
  .inputbar{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  .easy{padding:24px 18px}
  .easy .ln{grid-template-columns:64px 1fr 36px;gap:12px}
  .easy .pic{width:64px;height:64px}.easy .pic img{width:56px;height:56px}
  .easy .txt{font-size:19px}
  .score-num{font-size:46px}
}
@media (max-width:480px){
  .brand span:last-child{font-size:17px}
  .inputbar{grid-template-columns:1fr}
  .steps li{font-size:0}
  .steps li span{font-size:12px}
}

@media print{
  @page{size:A4;margin:18mm 16mm 20mm;@bottom-center{content:counter(page);font-size:11pt}}
  body{background:#fff;font-size:16pt}
  header.site,footer.site,.intro,.steps,.toolbar,.next,.credit,#s1,#s2,#s4,.easy .say{display:none!important}
  #s3{display:block!important}
  .easy{border:0;padding:0;max-width:none}
  .easy h2{font-size:22pt}
  .easy .ln{grid-template-columns:30mm 1fr;break-inside:avoid;border-bottom:0;padding:4mm 0}
  .easy .pic{width:28mm;height:28mm;border:0}.easy .pic img{width:26mm;height:26mm}
  .easy .txt{font-size:18pt}
  body.print-quiz #s3{display:none!important}
  body.print-quiz #s4{display:block!important}
  body.print-quiz .q .tally button{display:none}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
.field.inline span{white-space:nowrap}
.fact.drop .s{color:var(--mute,#8a8a8a)}