:root {
  --font-caption:0.75rem; --font-small:0.8125rem; --font-label:0.875rem; --font-body:0.9375rem; --font-eyebrow:0.6875rem;
  --canvas:#f5f4ee; --surface:#fff; --surface-soft:#f8faf5; --ink:#25382e;
  --secondary:#647469; --muted:#8c988d; --green:#287855; --green-deep:#1e6043;
  --green-soft:#eaf3e9; --yellow:#fff2c6; --line:#e5e9e1;
  --radius:18px; --shadow:0 12px 44px rgba(38,66,45,.055);
}
*{box-sizing:border-box} [hidden]{display:none!important}
body{margin:0;background:radial-gradient(ellipse at 5% 20%,#eaf0e2 0,transparent 48%),radial-gradient(ellipse at 95% 85%,#e8efe5 0,transparent 45%),var(--canvas);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI','Microsoft YaHei',sans-serif;font-size: var(--font-body);-webkit-font-smoothing:antialiased}
button,input,select{font:inherit}button{border:0;background:none;color:inherit;cursor:pointer}a,button,input{-webkit-tap-highlight-color:transparent}a{color:var(--green)}button:disabled{opacity:.45;cursor:default}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:3px solid #87b58a;outline-offset:4px}button:hover{color:var(--green)}svg{display:block;width:23px;height:23px}h1,h2,h3,p{overflow-wrap:anywhere}
.brandbar{max-width:1280px;margin:26px auto 22px;display:flex;justify-content:space-between;align-items:center;padding:0 24px;min-height:42px}.brand{display:flex;gap:10px;align-items:center;text-decoration:none;font-size:23px;font-weight:750;letter-spacing:-.8px;color:var(--ink)}.brandcn{margin-left:9px;padding-left:17px;border-left:1px solid #d6ded1;color:#7d8c7b;font-size: var(--font-small);font-weight:400;letter-spacing:2px}.study-nav{display:flex;align-items:center;gap:8px;font-size: var(--font-small)}.study-nav a{text-decoration:none;padding:11px 16px;border-radius:25px;color:var(--secondary)}.study-nav a:hover{background:#e8efe2;color:var(--green)}.study-nav a:last-child{background:var(--green-soft);color:var(--green)}.study-nav #wordbook-count{display:inline-grid;place-items:center;min-width:21px;height:21px;padding:0 5px;border-radius:50%;background:#dfeadc;font-size: var(--font-caption);margin-left:4px}
.workspace{max-width:1232px;margin:auto;background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);overflow:hidden}.lesson-head{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:30px 34px 26px;border-bottom:1px solid var(--line)}.lesson-head>div{min-width:0}.eyebrow{font-size: var(--font-eyebrow);letter-spacing:2px;font-weight:650;color:#70916a}.eyebrow span{font-size: var(--font-eyebrow);letter-spacing:1px;font-weight:400;color:#97a18e;margin-left:12px}h1{font-size:28px;font-weight:650;letter-spacing:-.5px;line-height:1.4;margin:10px 0}.lesson-head p{margin:0;color:var(--secondary);font-size: var(--font-small);line-height:1.8}.dot{padding:0 9px;color:#bbc3b4}.course-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 34px;background:#fcfdf9;border-bottom:1px solid var(--line);font-size: var(--font-caption);color:#84917b}.course-bar label{display:flex;align-items:center;gap:13px;min-width:0}.course-bar>div{display:flex;align-items:center;gap:17px}.select-control{display:inline-block;position:relative;max-width:100%;min-width:0}.select-trigger{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:100%;min-height:42px;padding:10px 14px;border:1px solid #dde5d5;border-radius:11px;background:#fff;color:#415b3b;font-size: var(--font-small);text-align:left;transition:border-color .15s,box-shadow .15s}.select-trigger:hover,.select-trigger[aria-expanded=true]{border-color:#9aba87;box-shadow:0 0 0 3px #97b38310}.select-trigger svg{width:17px;height:17px;flex-shrink:0;color:#879c7b}.select-caption{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.course-bar .select-control{max-width:400px}.select-menu{position:fixed;z-index:210;padding:8px;background:white;border:1px solid #e1e9da;border-radius:16px;box-shadow:0 16px 50px #203c2530;overflow-y:auto;overscroll-behavior:contain;animation:menu-enter .16s ease-out}.select-option{display:flex;align-items:center;justify-content:space-between;gap:15px;width:100%;min-height: 36px;padding:12px;border-radius:9px;text-align:left;font-size: var(--font-small);line-height:1.5;color:#58684e}.select-option:hover,.select-option:focus{background:#f4f7ef;outline:0}.select-option[aria-selected=true]{background:#eaf3e4;color:#387641;font-weight:550}.option-check{color:#599a58;flex-shrink:0}.select-backdrop{position:fixed;inset:0;z-index:200;background:transparent}.compact-select .select-trigger{padding:0 4px;min-height:32px;border:0;background:transparent;gap:5px;box-shadow:none;font-size: var(--font-small)}.compact-select .select-trigger svg{width:13px;height:13px}
.study-layout{display:grid;grid-template-columns:1.15fr 1fr}.watch-panel{padding:28px;background:linear-gradient(145deg,#fbfcf9,#f9fbf5);border-right:1px solid var(--line)}.video-wrap{position:relative;aspect-ratio:16/9;background:#15231a;overflow:hidden;border-radius:16px;box-shadow:0 6px 18px #253e2810}.video-wrap video{width:100%;height:100%;object-fit:contain;display:block;background:#101813}.video-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:60px;height:60px;display:grid;place-items:center;border:1px solid #ffffff70;border-radius:50%;color:white;background:#ffffff28;backdrop-filter:blur(5px)}.video-play:hover{background:#fff4;color:white}.video-wrap.is-playing .video-play{opacity:0;pointer-events:none}.video-tag{position:absolute;top:16px;left:17px;color:#ffffffe0;font-size: var(--font-caption);letter-spacing:1.7px}.fullscreen{position:absolute;right:12px;bottom:12px;color:white;background:#10231670;padding:9px;border-radius:9px}.fullscreen:hover{color:white;background:#102316aa}.fullscreen svg{width:17px;height:17px}.watch-caption{display:flex;gap:8px;align-items:center;margin:14px 1px 0;font-size: var(--font-caption);line-height:1.7;color:#7e8d75;min-height:20px}.live-dot{width:6px;height:6px;background:#72a569;border-radius:50%;flex-shrink:0}.lesson-note{display:flex;gap:16px;align-items:flex-start;margin:28px 0 22px;padding:21px 22px;background:#eff4e8;border-radius:13px}.note-symbol{font-size:28px;color:#82a365;line-height:1.3}.lesson-note h2{font-size:19px;font-weight:500;margin:1px 0 8px;letter-spacing:-.3px}.lesson-note p{font-size: var(--font-small);line-height:1.9;color:#7f9273;margin:0}.subtitle-note{font-size: var(--font-caption);line-height:1.9;color:#86967b;margin:0 3px 8px}.attribution{font-size: var(--font-caption);line-height:1.8;color:#8c9b80;text-decoration:none;margin-left:3px}.transcript-panel{display:flex;flex-direction:column;min-width:0;background:white}.transcript-head{display:flex;align-items:center;justify-content:space-between;padding:26px 25px 19px;gap:12px}.transcript-head h2{margin:0 0 6px;font-size: var(--font-body);font-weight:600}.transcript-head h2 span{margin-left:7px;padding:3px 7px;border-radius:5px;background:#f1f4eb;font-size: var(--font-caption);color:#8b9b7d;font-weight:400}.transcript-head p{font-size: var(--font-caption);margin:0;color:#8b9880}.follow-button{white-space:nowrap;min-height:36px;font-size: var(--font-caption);border:1px solid #dfebd7;color:#5b8950;background:#eff6e9;border-radius:20px;padding:8px 12px}.follow-button[aria-pressed=false]{background:#f6f7f3;color:#899580;border-color:#e8ebdf}.transcript{height:425px;overflow-y:auto;padding:0 22px 10px;position:relative;scrollbar-width:thin;scrollbar-color:#dce5d3 transparent;overscroll-behavior:contain;overflow-anchor:none}.sentence{position:relative;text-align:left;width:100%;margin:0 0 12px;padding:18px 19px;border:1px solid #e6eae0;background:#fff;border-radius:13px;transition:background .16s,border-color .16s;color:var(--ink);cursor:pointer}.sentence:hover{background:#fafcf6;border-color:#cbd9bf}.sentence.active{background:var(--yellow);border-color:#eeddaa;box-shadow:0 3px 9px #b9a75a08}.sentence-time{display:block;padding:0;margin-bottom:12px;color:#96a185;font-size: var(--font-caption);letter-spacing:.3px;font-variant-numeric:tabular-nums;min-height:20px}.active .sentence-time{color:#ad8d3a}.sentence-en{display:block;font-size:18px;line-height:1.65;font-weight:500;letter-spacing:-.25px}.sentence-zh{display:block;font-size: var(--font-small);line-height:1.8;color:#7f8d72;margin-top:8px}.expression{display:inline;font:inherit;line-height:inherit;padding:0 1px;color:inherit;border-radius:2px;background:linear-gradient(transparent 83%,#abd69a 83%)}.expression:hover{background:#dcebd1;color:#2d713f}.sentence-save{position:absolute;right:10px;top:9px;font-size:22px;color:#a0ad92;display:grid;place-items:center;width:34px;height:34px;border-radius:50%}.sentence-save:hover{background:#e9efd9}.sentence-save[aria-pressed=true]{color:#5d9954}.sentence.loop-target::after{content:'循环中';position:absolute;right:48px;top:19px;font-size: var(--font-caption);color:#699257}.transcript.english-only .sentence-zh{display:none}
.controls{display:grid;grid-template-columns:1fr auto;gap:14px 25px;padding:18px 30px 22px;background:white;border-top:1px solid var(--line);align-items:center}.tool-row{display:flex;align-items:center;gap:10px;grid-column:1;grid-row:1;min-width:0}.tool{display:flex;align-items:center;justify-content:center;gap:9px;min-height:42px;padding:8px 12px;border-radius:11px;background:#f5f7f0;color:#667d58;font-size: var(--font-caption);white-space:nowrap}.tool:hover{background:#edf3e4}.tool[aria-pressed=true]{background:#eaf3e4;color:#3b8143}.tool-icon{display:grid;place-items:center;position:relative;font-size:19px;color:inherit;height:22px}.tool-icon svg{width:20px;height:20px}.small-a{position:absolute;font-size: var(--font-caption);bottom:-1px;right:-7px}.speed-tool{gap:6px}.timeline{display:flex;align-items:center;gap:16px;grid-column:1/-1;grid-row:2}.timeline output{font-size: var(--font-caption);min-width:31px;color:#8b987e;font-weight:550;font-variant-numeric:tabular-nums}#elapsed{color:#418f69}input[type=range]{appearance:none;height:5px;width:100%;border-radius:10px;cursor:pointer;margin:8px 0;background:linear-gradient(to right,#69a681 var(--progress,0%),#e6ebdf var(--progress,0%))}input[type=range]::-webkit-slider-thumb{appearance:none;width:15px;height:15px;border:3px solid #58a073;background:#fff;border-radius:50%;box-shadow:0 0 0 4px #67a7780c}input[type=range]::-moz-range-thumb{width:11px;height:11px;border:3px solid #58a073;background:#fff;border-radius:50%}.transport{grid-column:2;grid-row:1;display:flex;align-items:center;gap:20px}.transport-buttons{display:flex;align-items:center;gap:18px}.transport-buttons>button{display:grid;place-items:center;min-width:38px;height:38px;border-radius:50%;color:#5c7452}.transport-buttons>button:hover{background:#eff4e8}.transport-buttons .play-button{width:46px;height:46px;background:var(--green);color:white;box-shadow:0 4px 14px #28785525}.transport-buttons .play-button:hover{background:var(--green-deep);color:white}.play-button svg{width:21px;height:21px}.position{font-size: var(--font-caption);color:#96a387;font-variant-numeric:tabular-nums;min-width:49px}.page-foot{font-size: var(--font-caption);color:#98a68e;letter-spacing:2px;text-align:center;margin:24px 0}.page-foot span{letter-spacing:1px;margin-left:12px}.error{color:#b15c41}
.import-dialog,.expression-dialog{width:min(500px,calc(100% - 32px));padding:28px;border:1px solid #e1e9d9;border-radius:22px;color:var(--ink);box-shadow:0 25px 100px #19382430;max-height:calc(100dvh - 36px);overflow-y:auto}.import-dialog::backdrop,.expression-dialog::backdrop{background:#19352360;backdrop-filter:blur(5px)}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.dialog-head h2{font-size:21px;font-weight:600;margin:0}.dialog-head>button{font-size:26px;width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:#f3f6ed;color:#7d916d}.dialog-intro{font-size: var(--font-small);color:#839476;line-height:1.8;margin:11px 0 25px}.file-field{display:block;font-size: var(--font-small);color:#5e7452;margin:18px 0}.file-field span{font-size: var(--font-caption);color:#96a389;margin-left:5px}.file-field input{display:block;max-width:100%;width:100%;margin-top:9px;padding:12px;border:1px solid #dde6d3;border-radius:10px;color:#5a7050;background:#fafcf6;font-size: var(--font-small)}.file-field input::file-selector-button{background:#eaf2e2;color:#5e854c;border:0;border-radius:6px;padding:7px 10px;margin-right:9px}.import-submit{display:block;width:100%;padding:13px;border-radius:11px;background:var(--green);color:white;font-size: var(--font-small);min-height:46px}.import-submit:hover{color:white;background:var(--green-deep)}#import-error{font-size: var(--font-small);line-height:1.8}.expression-dialog h2{font-size:30px;letter-spacing:-.8px;margin:27px 0 13px}.expression-meaning{font-size:18px;line-height:1.7;color:#56834a;margin:0 0 12px}.expression-note{font-size: var(--font-small);color:#7c8d70;line-height:1.9}.expression-context{margin:22px 0;padding:19px;background:#f4f7ee;border:1px solid #e4eadb;border-radius:12px}.expression-context p:first-child{font-size:16px;line-height:1.8;margin:0 0 10px}.expression-context p:nth-child(2){font-size: var(--font-small);line-height:1.8;color:#859675;margin:0 0 14px}.expression-context small{font-size: var(--font-caption);color:#98a78a}.expression-actions{display:flex;gap:12px;justify-content:space-between}.expression-actions button{padding: 7px 14px;min-height: 36px;border:1px solid #dce6d1;border-radius:10px;color:#61894e;font-size: var(--font-small)}.expression-actions button:last-child{background:var(--green);color:#fff;border-color:var(--green)}.expression-actions button[aria-pressed=true]{background:#eaf3e2;color:#548646;border-color:#dce8d0}#expression-message{min-height:17px;font-size: var(--font-caption);color:#7d9869;margin-bottom:0}
.review-workspace{max-width:1100px;margin:auto;padding:37px 42px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);min-height:620px}.review-heading{display:grid;grid-template-columns:1fr auto;column-gap:32px;align-items:center;border-bottom:1px solid var(--line);padding-bottom:27px}.review-heading>.eyebrow{grid-column:1}.review-heading h1{font-size:29px;grid-column:1;margin:12px 0 8px}.review-heading>p{grid-column:1;font-size: var(--font-small);color:#8a9a7b;margin:0}.review-stats{display:flex;gap:10px;grid-column:2;grid-row:1/4}.review-stats>span{padding:17px 21px;min-width:104px;border:1px solid #e1ead7;border-radius:13px;background:#f4f8ee;font-size: var(--font-caption);color:#8b9c7a}.review-stats strong{font-size:28px;font-weight:550;color:#628a50;display:block;margin-bottom:6px}.review-tabs{display:inline-flex;gap:5px;padding:5px;background:#f0f4e9;border-radius:12px;margin:25px 0 0}.review-tabs a{display:block;padding:11px 18px;text-decoration:none;font-size: var(--font-small);color:#8a9a78;border-radius:9px}.review-tabs a[aria-current]{color:#4a7e3e;background:white;box-shadow:0 2px 7px #4260270c}.collection-toolbar{display:flex;align-items:center;justify-content:space-between;gap:18px;margin:16px 0 22px;font-size: var(--font-caption);color:#8a9b78}.collection-toolbar label{display:flex;align-items:center;gap:10px}.start-review-link{display:inline-flex;align-items:center;text-decoration:none;padding: 7px 14px;border-radius:10px;background:#eaf3e4;color:#527e40;font-size: var(--font-small)}.collection-list{display:grid;grid-template-columns:1fr 1fr;gap:18px}.collection-card{display:flex;flex-direction:column;padding:23px;border:1px solid #e3ead9;border-radius:16px;background:#fcfdf8;transition:border-color .2s,box-shadow .2s}.collection-card:hover{border-color:#c9d9b9;box-shadow:0 4px 18px #466b2b06}.collection-meta{font-size: var(--font-caption);letter-spacing:.8px;color:#8b9c78}.collection-card h2{font-size:22px;line-height:1.5;font-weight:550;letter-spacing:-.35px;margin:13px 0 10px;color:#36572c}.collection-meaning{font-size: var(--font-small);line-height:1.9;color:#688653;margin:0 0 15px}.collection-context{font-size: var(--font-small);line-height:1.9;color:#8c9a7c;margin:0 0 20px}.collection-footer{display:flex;align-items:center;flex-wrap:wrap;gap:11px;margin-top:auto;padding-top:13px;border-top:1px solid #e9eee1}.collection-footer a{font-size: var(--font-caption);line-height:1.8;color:#829d6b;text-decoration:none;width:100%}.collection-footer small{font-size: var(--font-caption);color:#98a78a}.collection-footer button{font-size: var(--font-caption);color:#8c9f79;margin-left:auto;padding:5px 0}.collection-footer button:hover{color:#ba7653}.empty-state{text-align:center;padding:52px 10px}.empty-state>span{font-size:42px;color:#9bb789}.empty-state h2{font-size:21px;font-weight:500;margin:20px 0 13px}.empty-state p{font-size: var(--font-small);line-height:2;color:#8a9c78}.empty-state a{display:inline-block;font-size: var(--font-small);margin-top:16px;text-decoration:none}#book-message{font-size: var(--font-caption);line-height:1.8;min-height:19px;margin:12px 0 0;color:#7d9768}#book-message button{font-size: var(--font-caption);text-decoration:underline;color:var(--green)}#book-message:empty{min-height:0;margin:0}.review-intro,.review-complete{text-align:center;padding:46px 12px}.review-decoration{display:inline-grid;place-items:center;width:68px;height:68px;background:#edf4e5;border:1px solid #dde9d2;border-radius:22px;color:#7ca467;font-size:30px;margin-bottom:13px}.review-intro h2,.review-complete h2{font-size:25px;font-weight:500;margin:12px 0 16px;letter-spacing:-.4px}.review-intro p,.review-complete p{font-size: var(--font-small);line-height:2;color:#879975}.primary-action{background:var(--green);color:white;border-radius:12px;min-height:46px;padding:14px 26px;font-size: var(--font-small);box-shadow:0 4px 12px #28785515}.primary-action:hover{background:var(--green-deep);color:white}.review-intro .primary-action{margin-top:17px}#review-availability{font-size: var(--font-caption);margin-top:18px}.session-meta{display:flex;justify-content:space-between;align-items:center;max-width:660px;margin:26px auto 14px;color:#8a9b76;font-size: var(--font-small)}.session-meta button{font-size: var(--font-caption);color:#91a27c;padding:8px}.flashcard{max-width:660px;margin:0 auto 22px;padding:33px;background:linear-gradient(145deg,#fff9e7,#fcf7e3);border:1px solid #eee1b6;border-radius:20px;box-shadow:0 8px 30px #a5873308}.flashcard h2{font-size:25px;line-height:1.65;letter-spacing:-.3px;font-weight:500;margin:25px 0 14px}#card-instruction{font-size: var(--font-small);color:#a89d7e;margin:0 0 27px}#card-answer{border-top:1px solid #e9dfbf;padding-top:23px}#card-term{font-size:27px;color:#527b3f;margin:0 0 10px;letter-spacing:-.6px}#card-note{font-size: var(--font-small);color:#8e9475;line-height:1.9}.flashcard-context{background:#ffffff90;border:1px solid #eee8d3;border-radius:11px;padding:18px}.flashcard-context p:first-child{font-size:16px;line-height:1.85;margin:0 0 10px}.flashcard-context p:last-child{font-size: var(--font-small);line-height:1.9;color:#92987c;margin:0}.flashcard-source{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:24px;font-size: var(--font-caption);color:#a4a182}.flashcard-source span{max-width:70%;line-height:1.8}.flashcard-source button{font-size: var(--font-caption);min-height:36px;white-space:nowrap;color:#678a50}#review-session>#reveal-answer{display:block;max-width:660px;width:100%;margin:auto}#rating-actions{display:flex;gap:14px;max-width:660px;margin:auto}#rating-actions button{flex:1;min-height:46px;border-radius:11px;padding:13px;font-size: var(--font-small)}#rate-forgotten{background:#f7eee0;border:1px solid #e9dbc0;color:#a18052}#rate-remembered{background:var(--green);color:white}.session-tip,#review-error{font-size: var(--font-caption);line-height:1.9;text-align:center;margin:18px 0;color:#94a47f}.review-complete>div{margin:25px 0}.secondary-action{padding:13px 18px;border:1px solid #dfe8d3;border-radius:11px;font-size: var(--font-small);color:#6f9159;margin-left:10px}.review-complete>a{font-size: var(--font-small);text-decoration:none}
@keyframes menu-enter{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1440px){.brandbar{margin-top:34px}.workspace{margin-top:0}.transcript{height:460px}}
@media(max-width:1000px) and (min-width:801px){.workspace{margin:0 20px}.lesson-head{padding:25px}.course-bar{padding:14px 25px}.watch-panel{padding:20px}.tool{padding:8px;gap:6px;font-size: var(--font-caption)}.controls{padding:16px 22px;gap:12px}.transport{gap:10px}.transport-buttons{gap:10px}.position{display:none}.review-workspace{margin:0 20px;padding:30px}.review-heading h1{font-size:24px}.review-stats>span{min-width:80px;padding:13px}}
@media(max-width:800px){
  body{padding-bottom:154px}.brandbar{margin:0 auto;padding:14px 18px;min-height:64px}.brand{font-size:20px;gap:8px}.brandcn{display:none}.study-nav{font-size: var(--font-caption);gap:3px}.study-nav a{padding:8px 10px}.study-nav #wordbook-count{min-width:18px;height:18px;font-size: var(--font-caption);margin-left:2px}.workspace{max-width:640px;margin:0 auto;border-radius:19px}.lesson-head{padding:21px 22px 18px;gap:14px}.lesson-head h1{font-size:21px;margin:8px 0;line-height:1.45}.lesson-head p{font-size: var(--font-caption)}.eyebrow{font-size: var(--font-eyebrow);letter-spacing:1.5px}.eyebrow span{display:none}.course-bar{padding:12px 22px;flex-wrap:wrap;gap:9px}.course-bar label{width:100%;gap:12px}.course-bar .select-control{max-width:none;flex:1}.course-bar .select-trigger{width:100%;min-height:40px}.course-bar>div{width:100%;justify-content:space-between;font-size: var(--font-caption)}.study-layout{display:block}.watch-panel{padding:18px 20px 0;border:0;background:white}.video-wrap{border-radius:13px}.video-tag{font-size: var(--font-caption);top:12px;left:13px}.video-play{width:52px;height:52px}.watch-caption{font-size: var(--font-caption);margin:10px 1px 0}.lesson-note,.attribution,.subtitle-note{display:none}.transcript-head{padding:20px 22px 15px}.transcript-head h2{font-size: var(--font-body)}.transcript-head p{font-size: var(--font-caption)}.follow-button{font-size: var(--font-caption);min-height:34px;padding:7px 10px}.transcript{height:340px;padding:0 20px 8px;scroll-padding-bottom:12px}.sentence{padding:17px;margin-bottom:11px}.sentence-en{font-size:18px;line-height:1.65}.sentence-zh{font-size: var(--font-small);line-height:1.85}.sentence-save{width:38px;height:38px;top:5px;right:6px}.sentence-time{margin-bottom:9px}.controls{position:fixed;bottom:0;left:50%;transform:translateX(-50%);z-index:20;width:min(640px,100%);display:flex;flex-direction:column;gap:6px;padding:10px 20px max(11px,env(safe-area-inset-bottom));border:1px solid #e0e7d6;border-bottom:0;border-radius:19px 19px 0 0;background:#fffffff7;backdrop-filter:blur(16px);box-shadow:0 -5px 25px #263e2a0c}.tool-row{width:100%;justify-content:space-between;gap:5px}.tool{min-width:0;min-height:36px;padding:7px 9px;gap:5px;font-size: var(--font-caption);border-radius:9px}.tool-icon{height:18px;font-size:16px}.tool-icon svg{width:16px;height:16px}.small-a{font-size: var(--font-caption);right:-5px}.compact-select .select-trigger{font-size: var(--font-caption);min-height:22px;padding:0;gap:2px}.compact-select .select-trigger svg{width:11px;height:11px}.timeline{order:1;width:100%;gap:12px;height:20px}.timeline output{font-size: var(--font-caption);min-width:28px}.transport{order:2;position:relative;width:100%;justify-content:center;gap:0;min-height:49px}.transport-buttons{gap:32px}.transport-buttons .play-button{width:46px;height:46px}.transport-buttons>button{width:38px;height:38px}.position{position:absolute;right:0;font-size: var(--font-caption);min-width:0}.page-foot{font-size: var(--font-caption);margin:18px 0}.page-foot span{display:none}.review-page{padding-bottom:0}.review-workspace{max-width:640px;margin:0 auto;padding:27px 25px;border-radius:19px;min-height:580px}.review-heading{display:block;padding-bottom:22px}.review-heading h1{font-size:24px;line-height:1.5;margin:12px 0}.review-heading>p{font-size: var(--font-small)}.review-stats{margin-top:22px;gap:10px}.review-stats>span{display:flex;align-items:center;gap:10px;flex:1;padding:12px 14px;min-width:0;font-size: var(--font-caption)}.review-stats strong{display:inline;margin:0;font-size:23px}.review-tabs{width:100%;margin-top:20px}.review-tabs a{flex:1;text-align:center;padding:11px 12px;font-size: var(--font-small)}.collection-toolbar{margin:20px 0;gap:10px}.collection-toolbar label{gap:8px;font-size: var(--font-caption)}.collection-toolbar .select-trigger{font-size: var(--font-caption);min-height:40px;padding:9px 11px;gap:8px}.start-review-link{font-size: var(--font-caption);padding: 7px 12px;white-space:nowrap}.collection-list{grid-template-columns:1fr;gap:13px}.collection-card{padding:21px}.collection-card h2{font-size:21px}.collection-footer a{font-size: var(--font-caption)}.review-intro,.review-complete{padding:35px 0}.review-intro h2,.review-complete h2{font-size:22px}.review-intro p,.review-complete p{font-size: var(--font-small)}.flashcard{padding:25px;border-radius:16px}.flashcard h2{font-size:22px;line-height:1.7;margin:22px 0 13px}#card-term{font-size:25px}.flashcard-context{padding:15px}.flashcard-context p:first-child{font-size: var(--font-body)}.flashcard-source{gap:10px;font-size: var(--font-caption)}.flashcard-source span{max-width:66%}.session-meta{margin-top:21px}.expression-dialog,.import-dialog{padding:24px;border-radius:19px}.expression-dialog h2{font-size:28px}.dialog-head h2{font-size:19px}.expression-actions button{padding: 7px 13px}.file-field input{padding:10px;font-size: var(--font-small)}
}
@media(max-width:600px){.select-backdrop{background:#18332255;backdrop-filter:blur(3px)}.select-menu{left:10px!important;right:10px;bottom:max(10px,env(safe-area-inset-bottom));top:auto!important;width:auto!important;max-height:70dvh!important;padding:11px 10px 12px;border-radius:20px;animation:menu-enter .18s ease-out;box-shadow:0 -10px 50px #1a332133}.select-option{min-height:51px;padding:14px;font-size: var(--font-body);border-radius:12px}.option-check{font-size:16px}}
@media(max-width:680px){.workspace,.review-workspace{margin:0 12px}.lesson-head{padding:19px 19px 16px}.lesson-head h1{font-size:18px}.course-bar{padding:11px 19px}.course-bar label{font-size: var(--font-caption)}.course-bar>div{font-size: var(--font-caption)}.watch-panel{padding:16px 16px 0}.transcript{padding:0 16px 6px;height:320px}.transcript-head{padding:19px 18px 13px}.review-workspace{padding:24px 21px}.review-heading h1{font-size:23px}.lesson-head .dot{padding:0 5px}.lesson-head p{font-size: var(--font-caption)}}
@media(max-width:380px){.brandbar{padding:13px 15px}.study-nav a{font-size: var(--font-caption);padding:8px}.brand{font-size:18px}.lesson-head{gap:10px}.lesson-head h1{font-size:17px}.controls{padding-left:14px;padding-right:14px}.tool{padding:7px;font-size: var(--font-caption);gap:4px}.compact-select .select-trigger{font-size: var(--font-caption)}.tool-icon{font-size: var(--font-body)}.transcript{height:300px}.review-workspace{padding:23px 18px}.flashcard{padding:21px}.flashcard h2{font-size:20px}.expression-actions{gap:8px}.expression-actions button{font-size: var(--font-caption);padding:11px}.expression-dialog,.import-dialog{padding:22px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media(max-width:800px){.tool{min-height:42px}.sentence-save{width:42px;height:42px}.controls{gap:5px}} .select-backdrop{touch-action:none}
@media(max-width:800px){.lesson-head{display:block;position:relative}.lesson-head h1{margin-top:18px;font-size:20px}.course-bar{flex-wrap:nowrap;gap:12px}.course-bar label{width:auto;flex:1;gap:0;font-size:0}.course-bar>div{width:auto;flex-shrink:0}.course-bar #saved-progress{display:none}.tool-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}.tool{width:100%;font-size: var(--font-caption);padding:7px 4px}.tool-icon{display:none}.compact-select .select-trigger{font-size: var(--font-caption);gap:3px}.compact-select .select-trigger svg{width:12px;height:12px}}
@media(max-width:380px){.lesson-head h1{font-size:19px}.tool{font-size: var(--font-caption)}.compact-select .select-trigger{font-size: var(--font-caption)}.tool-row{gap:4px}}
@media(max-width:800px){.brandbar{min-height:56px;padding-top:11px;padding-bottom:11px}.lesson-head{padding:16px 19px 14px}.lesson-head .eyebrow{display:none}.lesson-head h1{font-size:19px;line-height:1.4;margin:0 0 10px}.lesson-head p{padding-right:75px}.course-bar{padding-top:8px;padding-bottom:8px}.course-bar .select-trigger{min-height:38px}.watch-panel{padding-top:14px}.watch-caption{margin-top:8px}.transcript-head{padding-top:17px;padding-bottom:12px}.transcript-head h2{margin-bottom:0}.transcript-head p{display:none}}
@media(max-width:380px){.lesson-head h1{font-size:18px}.lesson-head p{font-size: var(--font-caption)}.lesson-head .dot{padding:0 4px}}