:root{--red:#ff0033;--ink:#0f0f0f;--muted:#606060;--bg:#f8f8f8;--card:#fff;--line:#e5e5e5;--blue:#065fd4}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:"DM Sans","Noto Sans SC",sans-serif}button,input,select{font:inherit}.rail{position:fixed;left:0;top:0;bottom:0;width:216px;background:#fff;border-right:1px solid var(--line);padding:22px 16px;z-index:20}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);padding:0 8px}.brand>span{width:38px;height:27px;border-radius:8px;background:var(--red);color:#fff;display:grid;place-items:center;font-size:14px}.brand b{font-size:18px}.brand small{display:block;font-size:9px;letter-spacing:1.8px;color:var(--muted)}.rail nav{display:grid;gap:5px;margin-top:36px}.nav-btn{border:0;background:transparent;border-radius:10px;text-align:left;padding:12px 14px;font-weight:600;cursor:pointer}.nav-btn:hover,.nav-btn.active{background:#f2f2f2}.rail-note{position:absolute;bottom:24px;left:30px;color:#888;font-size:11px;line-height:1.6}main{margin-left:216px;padding:30px 3.5vw 70px}.topbar{display:flex;justify-content:space-between;align-items:end;border-bottom:1px solid var(--line);padding-bottom:25px}.eyebrow{font-size:11px;color:var(--muted);font-weight:700;letter-spacing:.7px}.topbar h1,.section-heading h2{font-size:clamp(32px,4vw,58px);line-height:1.08;margin:9px 0 0;letter-spacing:-2px}.topbar h1 em,.section-heading h2 em{font-style:normal;color:var(--red)}.streak{display:flex;gap:8px;align-items:center}.streak strong{font-size:42px}.streak span{font-size:10px;color:var(--muted)}.view{display:none}.view.active{display:block}.controls{display:flex;justify-content:space-between;gap:18px;padding:22px 0}.filters{display:flex;gap:8px;flex-wrap:wrap}.filters button{border:1px solid #ddd;background:#fff;border-radius:9px;padding:8px 13px;cursor:pointer;font-size:12px}.filters button.active{background:#0f0f0f;color:#fff;border-color:#0f0f0f}.search{display:flex;align-items:center;border:1px solid #c6c6c6;border-radius:22px;background:#fff;padding:0 14px;width:min(330px,100%)}.search input{border:0;outline:0;padding:10px;width:100%;background:transparent}.hot-section{margin:8px 0 32px}.hot-heading,.all-heading{display:flex;align-items:center;justify-content:space-between;margin:0 0 14px}.hot-heading>div{display:flex;align-items:center;gap:10px}.hot-heading strong,.all-heading h2{font-size:22px;margin:0}.hot-heading small,.hot-heading>span,.all-heading span{font-size:11px;color:var(--muted)}.youtube-dot{display:grid;place-items:center;background:var(--red);color:#fff;border-radius:8px;width:35px;height:25px;font-size:12px}.hot-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.hot-card{background:#fff;border-radius:14px;overflow:hidden;cursor:pointer;box-shadow:0 1px 2px rgba(0,0,0,.08);transition:.2s}.hot-card:hover,.episode-card:hover{transform:translateY(-3px);box-shadow:0 8px 25px rgba(0,0,0,.11)}.hot-cover{aspect-ratio:16/9;position:relative;background:#ddd}.hot-cover img,.episode-cover img{width:100%;height:100%;object-fit:cover;display:block}.rank{position:absolute;left:10px;top:10px;background:var(--red);color:#fff;padding:5px 8px;border-radius:7px;font-size:11px;font-weight:700}.views{position:absolute;right:8px;bottom:8px;background:rgba(0,0,0,.82);color:#fff;border-radius:4px;padding:4px 6px;font-size:11px}.hot-copy{padding:14px}.channel-line{display:flex;align-items:center;gap:9px}.pod-avatar,.hero-avatar{flex:0 0 auto;width:40px;height:40px;border-radius:50%;display:grid;place-items:center;font-size:11px;font-weight:800;border:1px solid rgba(0,0,0,.12);object-fit:contain}.hot-copy h3{font-size:17px;line-height:1.35;margin:11px 0 7px}.hot-copy p{font-size:12px;color:var(--muted);line-height:1.55;margin:0}.episode-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px 16px}.episode-card{cursor:pointer;transition:.2s;border-radius:12px;padding:0 0 13px}.episode-cover{position:relative;aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#ddd}.duration-chip{position:absolute;right:7px;bottom:7px;background:rgba(0,0,0,.82);color:#fff;font-size:10px;border-radius:4px;padding:3px 5px}.card-body{display:grid;grid-template-columns:40px 1fr;gap:10px;padding-top:11px}.card-body h3{font-size:15px;line-height:1.42;margin:0 0 5px}.card-body p{font-size:12px;line-height:1.45;color:var(--muted);margin:0}.authority{margin-top:7px!important;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.resume-chip{display:inline-block;margin-top:8px;color:var(--blue);font-size:11px;font-weight:700}.section-heading{display:flex;justify-content:space-between;align-items:end;padding:45px 0 28px;border-bottom:1px solid var(--line)}.primary{border:0;background:var(--red);color:#fff;border-radius:8px;padding:13px 18px;font-weight:700;cursor:pointer}.vocab-row{display:grid;grid-template-columns:35px 1fr 1fr 100px;gap:18px;align-items:center;border-bottom:1px solid var(--line);padding:18px 4px}.vocab-row h3{margin:0}.vocab-row p{font-size:12px;color:var(--muted)}.vocab-row button{border:1px solid var(--line);background:#fff;padding:8px;border-radius:6px}.empty{padding:55px 0;color:var(--muted)}.passage-list{display:grid;grid-template-columns:repeat(2,1fr);gap:15px;padding-top:25px}.passage{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px}.passage strong{background:#fff0a8}.player-page{position:fixed;inset:0;background:#fff;z-index:50;overflow:auto;padding:24px 4vw 70px;transform:translateX(100%);transition:.4s ease}.player-page.open{transform:none}.close-btn{border:0;background:#f2f2f2;border-radius:20px;padding:9px 14px;cursor:pointer}.player-hero{display:grid;grid-template-columns:minmax(300px,46%) 1fr;gap:28px;padding:25px 0}.hero-cover{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:14px;background:#ddd}.channel-row{display:flex;gap:10px;align-items:center}.hero-authority{margin:4px 0!important;font-size:12px!important;color:var(--muted)!important}.player-hero h2{font-size:clamp(28px,3.3vw,48px);line-height:1.12;margin:22px 0 12px}.player-hero>div>p{color:var(--muted);line-height:1.6}.study-toolbar{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-top:1px solid var(--line)}.mode-switch{background:#eee;border-radius:22px;padding:4px}.mode-switch button{border:0;background:transparent;padding:9px 14px;border-radius:18px;cursor:pointer;font-weight:600}.mode-switch button.active{background:#0f0f0f;color:#fff}.score{text-align:right;font-size:11px;color:var(--muted)}.score strong{display:block;font-size:24px;color:var(--ink)}.audio-dock{position:sticky;top:0;z-index:8;background:#151515;color:#fff;border-radius:12px;padding:12px 15px;display:flex;align-items:center;gap:11px;box-shadow:0 7px 30px rgba(0,0,0,.2)}.audio-dock button{width:38px;height:38px;border-radius:50%;border:1px solid #555;background:transparent;color:#fff;cursor:pointer}.audio-dock .play{background:var(--red);border:0}.timeline{flex:1}.timeline input{width:100%;accent-color:var(--red)}.timeline div{display:flex;justify-content:space-between;font-size:10px}.audio-dock select{background:#222;color:#fff;border:1px solid #555;border-radius:7px;padding:7px}.bookmark-bar{display:flex;gap:8px;overflow:auto;padding:10px 0;min-height:44px}.bookmark-pill{white-space:nowrap;border:1px solid var(--line);background:#fff;border-radius:18px;padding:7px 10px;font-size:11px;cursor:pointer}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:28px}.transcript-head{display:flex;justify-content:space-between;padding:12px 0;border-bottom:1px solid var(--line);font-size:11px;color:var(--muted)}.transcript-head button{border:0;background:transparent;color:var(--blue);cursor:pointer}.segment{position:relative;border-bottom:1px solid var(--line);padding:23px 18px;border-radius:10px;scroll-margin-top:100px;transition:.25s}.segment.active{background:#fff4f4;box-shadow:inset 4px 0 var(--red)}.segment .en{font-size:22px;line-height:1.65;margin:0}.segment .zh{color:var(--muted);line-height:1.7}.word{cursor:pointer;border-radius:3px}.word:hover{background:#fff0a8}.segment.masked .content-wrap{filter:blur(8px);opacity:.58;user-select:none}.segment.masked{overflow:hidden;background:rgba(245,245,245,.76)}.segment.masked:before{content:"暂停后点击揭开这句话";position:absolute;z-index:2;inset:0;display:grid;place-items:center;font-size:12px;color:#555;background:rgba(255,255,255,.18);backdrop-filter:blur(9px)}.segment.masked.revealed .content-wrap{filter:none;opacity:1;user-select:auto}.segment.masked.revealed:before{display:none}.segment .understood-btn{border:0;color:var(--blue);background:transparent;padding:8px 0;cursor:pointer}.episode-side{padding-top:12px}.youtube-link{display:block;background:var(--red);color:#fff;text-decoration:none;padding:12px;border-radius:8px;font-size:12px;font-weight:700}.side-tip{background:#f2f2f2;border-radius:10px;padding:16px;margin-top:12px;font-size:12px;line-height:1.6}.word-popover{position:fixed;z-index:100;width:290px;background:#fff;border:1px solid #ddd;border-radius:12px;padding:16px;box-shadow:0 12px 35px rgba(0,0,0,.22)}.word-popover h3{font-size:23px;margin:0 0 4px}.word-popover .phonetic{font-size:11px;color:var(--muted)}.word-popover p{font-size:12px;line-height:1.55}.word-popover button{width:100%;border:0;background:var(--red);color:#fff;border-radius:7px;padding:10px;cursor:pointer;font-weight:700}.toast{position:fixed;right:22px;bottom:22px;background:#111;color:#fff;border-radius:8px;padding:12px 17px;z-index:110;transform:translateY(100px);transition:.25s}.toast.show{transform:none}@media(max-width:1000px){.episode-grid{grid-template-columns:repeat(2,1fr)}.hot-grid{grid-template-columns:1fr}.hot-card{display:grid;grid-template-columns:42% 1fr}.hot-cover{height:100%}.player-hero{grid-template-columns:1fr}.study-layout{grid-template-columns:1fr}.episode-side{display:none}}@media(max-width:720px){.rail{position:static;width:auto;height:64px;display:flex;align-items:center;padding:10px}.rail nav{display:flex;margin:0 0 0 auto}.rail-note{display:none}.nav-btn{padding:9px}.brand small{display:none}main{margin:0;padding:20px 14px}.topbar h1{font-size:34px}.streak{display:none}.controls{display:block}.search{margin-top:12px}.episode-grid{grid-template-columns:1fr}.player-page{padding:16px}.player-hero{display:block}.hero-cover{margin-bottom:15px}.audio-dock{flex-wrap:wrap}.timeline{min-width:50%}.passage-list{grid-template-columns:1fr}.vocab-row{grid-template-columns:30px 1fr}.vocab-row p,.vocab-row button{grid-column:2}}
.vocab-mark{display:inline-flex;vertical-align:middle;flex-direction:column;align-items:flex-start;margin:2px 4px;padding:3px 7px;background:#fff0a8;border-radius:6px}.vocab-mark strong{background:transparent;color:#111}.vocab-mark small{font-size:10px;color:#785d00;max-width:240px;line-height:1.25}.passage-en{line-height:2.1}.lookup-loading{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px;padding:12px 0}.lookup-loading i{width:14px;height:14px;border:2px solid #ddd;border-top-color:var(--red);border-radius:50%;animation:spin .7s linear infinite}.zh-definition{background:#fff8d8;border-radius:8px;padding:10px!important}@keyframes spin{to{transform:rotate(360deg)}}.phonetic-line{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:3px 0 8px}.pronounce-btn{width:auto!important;background:#f2f2f2!important;color:#111!important;padding:7px 10px!important;border-radius:18px!important;font-size:11px!important}.pronounce-btn:hover{background:#e5e5e5!important}.sentence-list{margin-top:22px}.sentence-pair{padding:16px 0;border-bottom:1px solid var(--line)}.sentence-pair>p:first-child{font-size:19px;line-height:1.65;margin:0}.sentence-zh{margin:7px 0 0;color:var(--muted);font-size:14px;line-height:1.65}.target-word{background:#fff0a8!important;padding:1px 4px;border-radius:4px}.passage-glossary{margin-top:22px;padding:18px;background:#f7f7f7;border-radius:10px}.passage-glossary h4{margin:0 0 12px}.passage-glossary>div{display:grid;grid-template-columns:150px 1fr;gap:14px;padding:9px 0;border-top:1px solid #e4e4e4}.passage-glossary>div strong{background:transparent}.passage-glossary>div span{font-size:13px;color:var(--muted);line-height:1.5}.story-block{margin-top:22px}.story-block h4{font-size:11px;letter-spacing:.8px;color:var(--muted);margin:20px 0 8px}.story-en{font-size:20px;line-height:1.9;margin:0}.story-zh{font-size:15px;line-height:1.85;color:var(--muted);margin:0}.story-passage{grid-column:1/-1;max-width:1000px}.account-area{display:flex;align-items:center;gap:10px;font-size:11px;color:var(--muted)}.account-btn{border:1px solid var(--line);background:#fff;border-radius:20px;padding:9px 13px;cursor:pointer}.vocab-story-hint{padding:12px 0;color:var(--muted);font-size:12px}.segment-actions{display:flex;gap:8px;margin-top:10px;opacity:0;transition:.2s}.segment:hover .segment-actions,.segment.active .segment-actions{opacity:1}.segment-actions button{border:0;background:#f2f2f2;color:#555;border-radius:16px;padding:6px 10px;font-size:11px;cursor:pointer}.segment-actions button:hover{background:#ffe6e9;color:var(--red)}.saved-view{padding:30px 3.5vw 70px}.saved-sentence{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;margin:14px 0}.saved-sentence>p{font-size:18px;line-height:1.55}.saved-sentence .saved-zh{font-size:13px;color:var(--muted)}.saved-sentence button{border:0;background:#f2f2f2;border-radius:15px;padding:7px 11px;cursor:pointer}.selection-tools{position:fixed;z-index:140;background:#111;border-radius:8px;padding:5px;box-shadow:0 8px 28px rgba(0,0,0,.25)}.selection-tools button{border:0;background:transparent;color:#fff;padding:8px 10px;cursor:pointer}.comment-drawer{position:fixed;z-index:130;right:0;top:0;bottom:0;width:min(420px,92vw);background:#fff;box-shadow:-12px 0 40px rgba(0,0,0,.16);padding:22px;transform:translateX(110%);transition:.3s;overflow:auto}.comment-drawer.open{transform:none}.comment-head{display:flex;justify-content:space-between;align-items:start}.comment-head h3{margin:3px 0 0}.comment-head button,.modal-close{border:0;background:#eee;border-radius:50%;width:34px;height:34px;cursor:pointer}.comment-drawer blockquote{margin:22px 0;padding:15px;border-left:4px solid var(--red);background:#f7f7f7;line-height:1.55}.comment-item{border-bottom:1px solid var(--line);padding:13px 0}.comment-item small{float:right;color:var(--muted)}.comment-item p{line-height:1.55}.empty-comment{padding:24px 0;color:var(--muted)}#commentForm{position:sticky;bottom:0;background:#fff;padding-top:12px}#commentForm textarea{width:100%;min-height:90px;border:1px solid var(--line);border-radius:9px;padding:10px;resize:vertical}#commentForm button{margin-top:8px;width:100%}.modal{position:fixed;inset:0;z-index:160;background:rgba(0,0,0,.48);display:grid;place-items:center;padding:20px}.modal[hidden]{display:none}.modal-card{position:relative;width:min(430px,100%);background:#fff;border-radius:16px;padding:30px}.modal-close{position:absolute;right:16px;top:16px}.modal-card h2{margin:8px 0}.modal-card>p{color:var(--muted);font-size:13px;line-height:1.55}.modal-card label{display:grid;gap:6px;margin:14px 0;font-size:12px}.modal-card input{border:1px solid #ccc;border-radius:8px;padding:11px}.auth-actions{display:flex;gap:8px}.auth-actions button{flex:1;border:1px solid var(--line);border-radius:8px;padding:11px;cursor:pointer}.auth-actions .primary{border:0}#authMessage{display:block;margin-top:12px;color:var(--red)}@media(max-width:720px){.account-area span{display:none}.saved-view{margin-left:0;padding:20px 14px}.segment-actions{opacity:1}}.vocab-word{display:flex;align-items:center;gap:8px}.vocab-word h3{margin:0}.vocab-word button{border:0;background:#f2f2f2;border-radius:15px;padding:6px 9px;font-size:10px;cursor:pointer;white-space:nowrap}.vocab-word button:hover{background:#ffe6e9;color:var(--red)}#authMessage.auth-warning{background:#fff4df;border:1px solid #ffd58a;color:#7a4a00;border-radius:8px;padding:10px;line-height:1.55}
/* Search-friendly product explanation */
.seo-intro{max-width:900px;margin:0 0 22px;color:#555;line-height:1.8;font-size:15px}
.seo-about{margin:52px 0 20px;padding:32px;border:1px solid #e5e5e5;border-radius:20px;background:#fafafa;max-width:980px}
.seo-about h2{font-size:28px;margin:0 0 14px}.seo-about h3{font-size:18px;margin:24px 0 8px}.seo-about p{color:#555;line-height:1.8;margin:0}


/* Distinct login, signup and password-recovery states */
.auth-card{width:min(480px,100%)}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:4px;margin:18px 0 22px;padding:4px;background:#f1f1f1;border-radius:12px}
.auth-tabs[hidden]{display:none}.auth-tabs button{border:0;background:transparent;border-radius:9px;padding:11px;font-weight:700;cursor:pointer;color:var(--muted)}
.auth-tabs button.active{background:#fff;color:var(--ink);box-shadow:0 1px 6px rgba(0,0,0,.09)}
.auth-submit{width:100%;margin-top:8px;font-size:15px}.auth-link{display:block;border:0;background:transparent;color:var(--blue);padding:5px 0;margin:2px 0 8px;cursor:pointer;font-size:12px;text-align:left}
.auth-back{margin:14px auto 0;text-align:center}.auth-email-tip{background:#f5f7fb;border-radius:8px;padding:10px!important;margin:12px 0 0!important;color:#555!important}
#authMessage{min-height:18px;line-height:1.5}#authMessage.auth-success{color:#167746;background:#ecf8f1;border-radius:8px;padding:10px;margin-top:12px}#authMessage.auth-error{color:#b42318;background:#fff1f0;border-radius:8px;padding:10px;margin-top:12px}

.auth-card [hidden]{display:none!important}
.login-methods{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:#f1f1f1;border-radius:10px;padding:5px;margin:18px 0 8px}.login-methods button{border:0;background:transparent;border-radius:8px;padding:10px;font-weight:700;color:var(--muted);cursor:pointer}.login-methods button.active{background:#fff;color:#111;box-shadow:0 2px 8px rgba(0,0,0,.08)}.segment{cursor:pointer}.segment:hover{background:#fafafa}.segment.active:hover{background:#fff4f4}.segment:focus-visible{outline:2px solid var(--blue);outline-offset:-2px}.segment.masked:before{pointer-events:none}.mask-actions{position:relative;z-index:3;display:flex;gap:10px;margin-top:10px}.mask-actions button{border:0;background:#fff;color:var(--blue);border-radius:16px;padding:7px 11px;cursor:pointer}.mask-actions .reveal-btn{background:#111;color:#fff}.segment-play-hint{display:none}