:root{--green:#24634d;--ink:#243a32;--muted:#84908b;--line:#e7ebe6;--mint:#eef6ef;--paper:#fbfcf9}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft Yahei",sans-serif;font-size:14px}button,input,select{font:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,.sentence:focus-visible{outline:3px solid #84bd9f;outline-offset:3px}button{transition:background .15s,transform .15s}button:hover:enabled{filter:brightness(.97)}.sidebar{width:248px;position:fixed;left:0;top:0;bottom:102px;border-right:1px solid var(--line);background:#fff;padding:34px 22px;display:flex;flex-direction:column}.brand{color:var(--ink);font-size:23px;font-weight:700;text-decoration:none;display:flex;gap:11px;align-items:center}.brand-icon{display:grid;place-items:center;width:42px;height:42px;background:var(--green);color:#fff;border-radius:13px;font-size:28px}.brand small{display:block;font-size:8px;letter-spacing:1.2px;color:var(--muted);margin-top:6px}.upload-btn{border:0;background:var(--green);color:#fff;padding:13px 16px;border-radius:9px;font-weight:600;display:flex;align-items:center;justify-content:center;gap:10px}.sidebar>.upload-btn{margin:35px 0 31px}.upload-btn span{font-size:21px;font-weight:400}.section-label{text-transform:uppercase;font-size:11px;color:#9aaba2;letter-spacing:1px;display:flex;justify-content:space-between;padding:0 8px;margin-bottom:12px}.lesson-item{width:100%;display:flex;align-items:center;text-align:left;gap:11px;border:0;background:transparent;padding:13px 10px;border-radius:9px;margin:3px 0;color:var(--ink)}.lesson-item.selected{background:var(--mint);color:var(--green)}.lesson-symbol{height:33px;width:33px;flex-shrink:0;border-radius:8px;background:#f5f6f2;display:grid;place-items:center;color:#8ca495}.lesson-item.selected .lesson-symbol{background:#dcece0}.lesson-item strong{font-size:12px;font-weight:600;display:block;line-height:1.5;overflow:hidden;text-overflow:ellipsis;max-width:135px;white-space:nowrap}.lesson-item small{display:block;font-size:10px;color:#8b9991;margin-top:4px}.side-tip{margin-top:auto;padding:18px 14px;background:#f8faf5;border-radius:12px}.tip-icon{display:block;color:#91ae81;font-size:22px;margin-bottom:10px}.side-tip strong{font-size:12px}.side-tip p{font-size:11px;color:#909b94;line-height:1.9;margin-bottom:0}.sidebar-footer{font-size:9px;color:#a4aea8;text-align:center;margin-top:24px}main{margin-left:248px;padding-bottom:140px}.topbar{height:74px;border-bottom:1px solid var(--line);padding:0 46px;display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#8b9891;background:#fff9}.private-badge{padding:7px 11px;border-radius:20px;background:#f0f4ec;color:#83947e;display:flex;gap:6px;align-items:center}.private-badge i,.live-dot{width:5px;height:5px;border-radius:100%;background:#84ad8c;display:inline-block}.workspace{max-width:1170px;margin:auto;padding:36px 46px}.breadcrumb{color:#9ca79f;font-size:11px;margin-bottom:33px;display:flex;gap:12px}.title-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;gap:15px}.eyebrow{color:#8ca493;font-size:10px;letter-spacing:2px;font-weight:600}h1{font-size:34px;letter-spacing:-.7px;margin:11px 0 12px;font-weight:650}#lessonMeta{color:var(--muted);font-size:12px}.outline-btn{border:1px solid #dce5dc;border-radius:7px;background:#fff;color:#637b69;padding:10px 13px;font-size:11px;white-space:nowrap}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 224px;gap:25px;align-items:start}.dialogue-panel{border:1px solid var(--line);border-radius:13px;background:#fff;overflow:hidden}.panel-heading{padding:21px 25px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.panel-heading strong{font-size:13px}.count-tag{margin-left:10px;font-size:10px;color:#a0aaa3;padding:4px 7px;background:#f5f7f2;border-radius:4px}.switch-label{font-size:10px;color:#8d9b93;display:flex;gap:5px;align-items:center}input[type=checkbox]{accent-color:var(--green);cursor:pointer}.dialogue-toolbar{display:flex;justify-content:space-between;align-items:center;padding:14px 25px;color:#a0aaa3;font-size:10px}.dialogue-toolbar .live-dot{margin-right:6px;width:4px;height:4px}.text-btn{border:0;background:none;color:#7b9b86;font-size:11px;padding:4px}.transcript{min-height:380px;max-height:550px;overflow:auto;padding:5px 15px 20px}.sentence{display:flex;gap:17px;padding:20px 13px;border-radius:9px;margin:2px 0;cursor:pointer;border:1px solid transparent;position:relative}.sentence:hover{background:#f8faf5}.sentence.active{background:#edf6ef;border-color:#dbeadd}.sentence-number{font-size:11px;min-width:22px;color:#adb8b0;padding-top:5px;font-variant-numeric:tabular-nums}.sentence.active .sentence-number{color:#78a285}.sentence-content{min-width:0;flex:1}.sentence-text{font-size:17px;line-height:1.65;color:#5b6d61;letter-spacing:.05px;overflow-wrap:anywhere}.sentence.active .sentence-text{color:#729781}.sentence.active .word.spoken{color:#236348;font-weight:600}.sentence-time{font-size:9px;color:#b1bdb4;margin-top:8px;font-variant-numeric:tabular-nums}.sentence.active .sentence-time{color:#8fab97}.sentence-replay{border:0;background:none;color:#b4c3b7;font-size:17px;align-self:center;padding:5px;opacity:0}.sentence:hover .sentence-replay,.sentence.active .sentence-replay,.sentence-replay:focus{opacity:1}.empty{text-align:center;padding:55px 10px;color:#95a599}.empty>span{font-size:40px;color:#b5cbb6}.empty h2{font-size:18px;font-weight:500;color:#647c6a}.empty p{font-size:12px;line-height:1.9}.empty .outline-btn{margin-top:12px}.practice-panel{border:1px solid var(--line);border-radius:12px;padding:21px;background:#fff}.practice-header{display:flex;justify-content:space-between;font-size:12px;font-weight:600;margin-bottom:26px}.practice-header span{color:#c5d2c5}.field-label{display:block;font-size:10px;color:#8c9b91;margin:17px 0 10px}select,.text-input{width:100%;border:1px solid #e2e9df;border-radius:6px;padding:10px;color:#6c7e70;background:#fafcf8;font-size:12px}.setting-row{display:flex;justify-content:space-between;align-items:center;margin-top:25px;gap:6px}.setting-row strong{font-size:11px;font-weight:500}.setting-row small{font-size:9px;color:#a1aea4;display:block;margin-top:6px}.setting-row input{width:16px;height:16px}hr{border:0;border-top:1px solid var(--line);margin:24px 0}.hint{font-size:10px;line-height:1.9;color:#9aa99e}.full{width:100%}.practice-panel .outline-btn{font-size:9px;margin-top:9px;white-space:normal}.practice-tip{background:#f7f9f3;border-radius:7px;display:flex;gap:11px;margin-top:26px;padding:14px;color:#a1b297}.practice-tip span{font-size:18px}.practice-tip p{margin:0;line-height:2;font-size:9px}.practice-tip b{font-weight:500;color:#8d9b88}.status{font-size:11px;color:#859d88;line-height:1.8;margin-top:20px;min-height:20px}.player{position:fixed;bottom:0;left:0;right:0;height:102px;background:#fff;border-top:1px solid #e2e8df;box-shadow:0 -6px 30px #314c2b04;display:grid;grid-template-columns:280px minmax(300px,600px) 1fr;align-items:center;gap:24px;padding:16px 28px;z-index:10}.player-lesson{display:flex;gap:12px;align-items:center;min-width:0}.audio-mark{font-size:24px;color:#6b936e;width:42px;height:42px;background:#eff5e9;border-radius:10px;display:grid;place-items:center;flex-shrink:0}.player-lesson strong{font-size:12px;display:block;max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.player-lesson small{display:block;font-size:10px;color:#9ba89e;margin-top:7px}.player-center{padding-right:10px}.player-controls{display:flex;justify-content:center;align-items:center;gap:24px;margin-bottom:8px}.icon-btn{border:0;background:none;color:#7c9383;font-size:20px;padding:5px;line-height:1}.play-btn{width:37px;height:37px;background:var(--green);border:0;border-radius:50%;color:#fff;font-size:13px;padding-left:8px;display:grid;place-items:center}.play-btn.playing{padding-left:6px}.replay-btn{border:0;background:none;color:#91a28e;font-size:10px;padding:6px}.timeline{display:flex;align-items:center;gap:11px;font-size:9px;color:#a7b2a5;font-variant-numeric:tabular-nums}.timeline input{flex:1;min-width:0;accent-color:#58986d;height:3px;cursor:pointer}.player-note{font-size:10px;color:#a0afa1;display:flex;justify-content:flex-end;align-items:center;gap:7px}dialog{border:1px solid var(--line);border-radius:14px;padding:0;width:460px;max-width:calc(100% - 32px);max-height:90vh;box-shadow:0 20px 90px #1d342633;color:var(--ink)}dialog::backdrop{background:#16352566;backdrop-filter:blur(3px)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 25px;border-bottom:1px solid var(--line)}.modal-header h2{font-size:17px;margin:0}.modal-content{padding:23px 25px}.dropzone{border:1px dashed #bad2c0;border-radius:10px;background:#f8fcf6;padding:30px 15px;display:flex;flex-direction:column;align-items:center;gap:13px;text-align:center;cursor:pointer}.dropzone.dragging{background:#e1f1df}.dropzone input{position:absolute;width:1px;height:1px;opacity:0}.dropzone span{font-size:28px;color:#81a389}.dropzone strong{font-size:12px;color:#698171;max-width:100%;overflow-wrap:anywhere}.dropzone small{font-size:9px;color:#9bac9e}.modal-content>.upload-btn{margin-top:23px}progress{width:100%;height:8px;accent-color:var(--green)}.error{font-size:11px;color:#a34c39;line-height:1.8;margin-top:12px;overflow-wrap:anywhere}.import-details{font-size:11px;color:#8b9e8f;margin-top:20px}.import-details input{max-width:100%;font-size:10px;margin-top:10px}#editorDialog{width:640px}.edit-row{display:grid;grid-template-columns:20px 1fr;gap:10px;border-bottom:1px solid var(--line);padding:13px 0}.edit-row textarea{width:100%;resize:vertical;border:1px solid var(--line);border-radius:5px;min-height:58px;padding:9px;font:inherit;color:#617469}.edit-times{display:flex;gap:7px;align-items:center;margin-top:8px;font-size:10px;color:#9aad9e}.edit-times input{width:77px;padding:6px;border:1px solid var(--line);border-radius:4px;font-size:10px}#lessonList{overflow:auto;min-height:100px;max-height:55vh}#resetTrim{margin-top:9px}
@media(min-width:1500px){.workspace{padding-top:50px}.transcript{max-height:610px}.sentence{padding:23px 16px}.lesson-layout{grid-template-columns:minmax(0,1fr) 245px}}
@media(max-width:1050px){.sidebar{width:210px;padding:28px 15px}main{margin-left:210px}.workspace{padding:30px 26px}.topbar{padding:0 26px}.lesson-layout{grid-template-columns:minmax(0,1fr) 195px;gap:16px}.practice-panel{padding:17px}.player{grid-template-columns:210px 1fr;padding:14px 22px}.player-note{display:none}.sentence-text{font-size:15px}.panel-heading{padding:18px}.dialogue-toolbar{padding:14px 18px}}
@media(max-width:760px){.sidebar{position:static;width:100%;height:auto;padding:20px;display:grid;grid-template-columns:1fr auto;border:0;border-bottom:1px solid var(--line)}.brand{font-size:20px}.brand-icon{width:35px;height:35px}.brand small{font-size:7px}.sidebar>.upload-btn{margin:0;align-self:center;padding:10px 13px;font-size:11px}.section-label,.side-tip,.sidebar-footer{display:none}#lessonList{grid-column:1/-1;display:flex;gap:6px;overflow-x:auto;margin-top:16px;max-height:none;min-height:0;padding-bottom:3px}.lesson-item{width:auto;flex-shrink:0;padding:10px}.lesson-item strong{max-width:150px;font-size:11px}.lesson-symbol{display:none}.lesson-item small{font-size:9px}main{margin-left:0;padding-bottom:140px}.topbar{display:none}.workspace{padding:24px 18px}.breadcrumb{margin-bottom:25px}h1{font-size:26px}.title-row{margin-bottom:23px}.title-row>.outline-btn{font-size:10px;padding:9px}.lesson-layout{display:block}.practice-panel{margin-top:20px}.practice-header{margin-bottom:10px}.practice-panel .field-label{margin:12px 0 8px}.setting-row{margin-top:16px}.practice-tip{display:none}.transcript{max-height:470px;padding:5px 8px 15px;min-height:300px}.sentence{gap:10px;padding:17px 9px}.sentence-text{font-size:16px}.sentence-replay{opacity:1}.panel-heading{padding:17px 15px}.dialogue-toolbar{padding:13px 15px}.player{height:116px;grid-template-columns:1fr;padding:10px 18px;gap:4px}.player-lesson{display:none}.player-controls{gap:23px;margin-bottom:12px}.player-center{padding:0}.player-controls .play-btn{width:39px;height:39px}.replay-btn{font-size:11px}.timeline{font-size:10px}.count-tag{font-size:9px}.switch-label{font-size:9px}}
.transcript{position:relative;max-height:clamp(230px,calc(100dvh - 500px),550px)}
@media(max-width:760px){.transcript{max-height:min(470px,calc(100dvh - 320px))}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

@media(max-width:760px){.player-controls .icon-btn,.player-controls .play-btn,.replay-btn,.sentence-replay{min-width:44px;min-height:44px}.player-controls{gap:16px;margin-bottom:10px}.transcript{min-height:260px;max-height:min(470px,calc(100dvh - 460px))}.sentence-replay{opacity:1;flex-shrink:0}}

/* Reserve space for the fixed player, including iPhone's bottom safe area. */
:root{--player-height:102px;--player-safe-area:env(safe-area-inset-bottom,0px)}
html{scroll-padding-bottom:calc(var(--player-height) + var(--player-safe-area) + 16px)}
main{padding-bottom:calc(var(--player-height) + var(--player-safe-area) + 24px)}
.sidebar{bottom:calc(var(--player-height) + var(--player-safe-area))}
.transcript{padding-bottom:calc(var(--player-height) + var(--player-safe-area) + 24px);scroll-padding-block:12px}
.player{height:calc(var(--player-height) + var(--player-safe-area));padding-bottom:calc(16px + var(--player-safe-area))}
@media(max-width:760px){:root{--player-height:116px}.player{padding-bottom:calc(10px + var(--player-safe-area))}}

/* Chinese follows the same sentence interval as the English audio. */
.sentence-content{min-width:0}.sentence-translation{font-size:14px;line-height:1.8;color:#718077;margin-top:8px;overflow-wrap:anywhere;transition:color .15s}.sentence.active .sentence-translation{color:#24634d;font-weight:600}.translation-placeholder{font-size:12px;color:#8a968f;font-weight:400!important}.toolbar-actions{display:flex;gap:12px;align-items:center}.edit-label{display:block;font-size:11px;color:#718077;margin:8px 0 6px}.edit-translation{background:#f7faf5}.dialogue-toolbar{flex-wrap:wrap;gap:8px}
@media(max-width:760px){.sentence-translation{font-size:14px}.toolbar-actions{gap:10px}.dialogue-toolbar>span{font-size:10px}.dialogue-toolbar .text-btn{font-size:11px}}