:root{color-scheme:light;--bg:#f5f7fa;--panel:#fff;--ink:#172033;--muted:#667085;--line:#e3e8ef;--line-soft:#edf1f5;--blue:#2563eb;--blue-soft:#eaf2ff;--hidden:#eef2f6}
*{box-sizing:border-box}
html{width:100%;max-width:100%;background:var(--bg);overflow-x:hidden}
body{width:100%;max-width:100%;margin:0;background:var(--bg);color:var(--ink);overflow-x:hidden;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans","Yu Gothic","Noto Sans JP","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
.page{width:100%;max-width:920px;margin:0 auto;padding:14px 14px 28px}
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:12px;min-height:64px;margin-bottom:12px;padding:10px 12px 10px 16px;border:1px solid var(--line);border-radius:8px;background:rgba(255,255,255,.96);box-shadow:0 4px 14px rgba(16,24,40,.04);backdrop-filter:saturate(180%) blur(14px)}
.title{min-width:0;margin-right:auto}
.title strong{display:block;font-size:18px;line-height:1.2;font-weight:760;letter-spacing:0}
.title span{display:block;margin-top:3px;color:var(--muted);font-size:12px;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.controls{display:flex;align-items:center;gap:7px}
.voice-select{width:170px;min-width:145px;height:34px;padding:5px 28px 5px 9px;border:1px solid var(--line);border-radius:8px;background:#fff;color:#344054;font:inherit;font-size:12.5px;font-weight:600;line-height:1;cursor:pointer}
.voice-select:focus-visible{outline:2px solid #93c5fd;outline-offset:2px}
.mode-toggle{position:relative;display:flex;align-items:center;gap:7px;min-height:34px;padding:5px 8px;border:1px solid var(--line);border-radius:8px;background:#fff;color:#344054;font-size:12.5px;font-weight:650;line-height:1;cursor:pointer;white-space:nowrap}
.mode-toggle input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.toggle-track{position:relative;width:30px;height:18px;border:1px solid #cbd3df;border-radius:999px;background:#e5e9ef;transition:background .15s ease,border-color .15s ease}
.toggle-track::after{content:"";position:absolute;top:2px;left:2px;width:12px;height:12px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #0003;transition:transform .15s ease}
.mode-toggle input:checked+.toggle-track{border-color:var(--blue);background:var(--blue)}
.mode-toggle input:checked+.toggle-track::after{transform:translateX(12px)}
.mode-toggle input:focus-visible+.toggle-track{outline:2px solid #93c5fd;outline-offset:2px}
.back{flex:none;min-height:34px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:#344054;font-size:12.5px;font-weight:680;line-height:1;text-decoration:none;white-space:nowrap}
.back:active{background:#f2f4f7}
.grammar-list{display:grid;gap:9px}
.grammar-card{display:grid;grid-template-columns:34px minmax(0,1fr);overflow:hidden;border:1px solid var(--line);border-radius:8px;background:var(--panel);box-shadow:0 4px 12px rgba(16,24,40,.035)}
.number{display:grid;place-items:start center;padding-top:16px;border-right:1px solid var(--line-soft);background:#f8fafc;color:var(--blue);font-size:12px;font-weight:760;font-variant-numeric:tabular-nums}
.pair{min-width:0}
.sentence-block,.translation-block{position:relative;display:grid;align-content:center;min-height:65px;padding:13px 15px;transition:background .15s ease}
.translation-block{border-top:1px solid var(--line-soft);background:#fbfcfd}
.sentence-lines,.translation-lines{display:grid;gap:6px}
.sentence-row{display:grid;grid-template-columns:minmax(0,1fr) 34px;align-items:start;gap:8px;min-width:0}
.sentence-lines p,.translation-lines p{margin:0;letter-spacing:0;overflow-wrap:anywhere}
.sentence-lines p{font-size:19px;line-height:1.55;font-weight:610}
.translation-lines p{color:#475467;font-size:15px;line-height:1.55;font-weight:480}
.sentence-row+.sentence-row .sentence-text,.translation-lines p+ p{padding-left:1.25em}
.sentence-speak{display:grid;place-items:center;width:32px;height:32px;margin:0;padding:0;border:1px solid #d9e0e9;border-radius:50%;background:#fff;color:#344054;font-size:15px;line-height:1;cursor:pointer;box-shadow:0 1px 3px rgba(16,24,40,.06);transition:background .15s ease,border-color .15s ease,transform .15s ease}
.sentence-speak:active{transform:scale(.94)}
.sentence-speak:focus-visible{outline:2px solid #93c5fd;outline-offset:2px}
.sentence-speak.is-speaking{border-color:#93b4f8;background:var(--blue-soft)}
.hide-sentences .sentence-block,.hide-translations .translation-block{background:var(--hidden)}
.hide-sentences .sentence-text,.hide-translations .translation-lines{visibility:hidden;user-select:none}
@media(max-width:640px){
  .page{padding:0 8px 20px}
  .top{flex-wrap:wrap;gap:8px;margin:0 -8px 8px;padding:9px 10px 8px;border-width:0 0 1px;border-radius:0}
  .title strong{font-size:16px}
  .title span{font-size:11px}
  .controls{order:3;display:grid;grid-template-columns:minmax(115px,1.2fr) repeat(2,minmax(0,1fr));width:100%;gap:6px;padding-top:7px;border-top:1px solid var(--line-soft)}
  .voice-select{width:100%;min-width:0;height:32px;padding-left:7px;font-size:12px}
  .mode-toggle{flex:1;justify-content:center;min-width:0;min-height:32px;padding:5px 6px;font-size:12px}
  .back{min-height:32px;padding:7px 9px;font-size:12px}
  .grammar-list{gap:7px}
  .grammar-card{grid-template-columns:29px minmax(0,1fr)}
  .number{padding-top:14px;font-size:11px}
  .sentence-block,.translation-block{min-height:56px;padding:11px 12px}
  .sentence-lines,.translation-lines{gap:5px}
  .sentence-row{grid-template-columns:minmax(0,1fr) 32px;gap:7px}
  .sentence-speak{width:30px;height:30px;font-size:14px}
  .sentence-lines p{font-size:16.5px;line-height:1.5}
  .translation-lines p{font-size:13.5px;line-height:1.5}
}
@media(max-width:370px){
  .controls{grid-template-columns:repeat(2,minmax(0,1fr))}
  .voice-select{grid-column:1/-1}
}