:root{color-scheme:light;--bg:#f2f2f7;--card:#fff;--text:#1c1c1e;--secondary:#737379;--line:#e5e5ea;--green:#24855b;--green-soft:#e8f3ec;--red:#c33d39;--font:-apple-system,BlinkMacSystemFont,'SF Pro Display','SF Pro Text','Helvetica Neue','PingFang SC','Microsoft YaHei',sans-serif}*{box-sizing:border-box}body{margin:0;background:#e6e8eb;color:var(--text);font-family:var(--font);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}button,a,input{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer;border:0}button:disabled{cursor:default;opacity:.42}a{color:var(--green);text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #408bc9;outline-offset:3px}h1,h2,h3,p{margin:0}h1{font-size:34px;line-height:1.2;letter-spacing:-1px;font-weight:750}h2{font-size:22px;line-height:1.35;letter-spacing:-.4px}h3{font-size:18px;font-weight:650}button svg,span svg{display:block;width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.device{background:var(--bg);width:min(100%,430px);margin:24px auto;height:calc(100dvh - 48px);max-height:1000px;border-radius:34px;box-shadow:0 18px 65px #1c253818;overflow:hidden;display:flex;flex-direction:column;position:relative;border:1px solid #fff9}.app-header{display:flex;justify-content:space-between;align-items:center;min-height:56px;padding:12px 24px 4px;flex-shrink:0}.wordmark{font-size:16px;letter-spacing:-.3px;font-weight:700;color:var(--text)}.prototype-label{background:#e5e5ea;color:#696970;font-size:11px;line-height:1.4;padding:4px 8px;border-radius:6px}.app-header .prototype-label{min-height:32px;min-width:44px}#screen{padding:18px 24px 32px;overflow:auto;flex:1;min-height:0;overscroll-behavior:contain;scrollbar-width:thin}#screen:focus{outline:none}.page-title{margin-bottom:28px}.page-title p{font-size:15px;line-height:1.6;color:var(--secondary);margin-top:10px}.overline{font-size:13px;color:var(--secondary);margin-bottom:8px}.section-head{display:flex;align-items:center;justify-content:space-between;margin:29px 0 12px;gap:12px}.section-head h2{font-size:20px}.section-head button{font-size:14px;background:none;color:var(--green);min-height:40px}.card{background:var(--card);border-radius:18px;overflow:hidden}.continue-card{padding:23px 22px}.lesson-kicker{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--secondary);margin-bottom:16px}.small-icon{display:inline-flex;align-items:center;justify-content:center;color:var(--green);background:var(--green-soft);width:29px;height:29px;border-radius:8px;flex-shrink:0}.small-icon svg{width:17px;height:17px}.continue-card h2{font-size:26px;letter-spacing:-.5px}.continue-card>p{font-size:15px;color:var(--secondary);margin:10px 0 22px}.primary,.secondary,.destructive{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:50px;padding:13px 18px;border-radius:12px;font-size:16px;font-weight:600;line-height:1.4}.primary{background:var(--green);color:white}.primary:hover{background:#1f754f}.secondary{background:#e8e8ed;color:var(--text)}.destructive{background:#fff;color:var(--red)}.text-button{background:none;color:var(--green);font-size:16px;min-height:44px;padding:8px 0}.progress-meta{display:flex;justify-content:space-between;font-size:13px;color:var(--secondary);margin:22px 0 8px}.progress{height:5px;overflow:hidden;border-radius:8px;background:#e8e8ed}.progress i{display:block;background:var(--green);height:100%;border-radius:8px;transition:width .2s}.list{background:white;border-radius:15px;overflow:hidden}.row{display:flex;align-items:center;gap:13px;width:100%;background:white;text-align:left;padding:17px 16px;min-height:65px;position:relative}.row+.row:before{content:'';position:absolute;left:58px;right:0;top:0;height:1px;background:var(--line)}.row .row-body{flex:1;min-width:0}.row b{font-size:16px;line-height:1.45;font-weight:550;display:block}.row small{display:block;font-size:13px;color:var(--secondary);line-height:1.5;margin-top:3px}.row .chevron{color:#b5b5bb;width:15px;height:18px;stroke-width:2;flex-shrink:0}.row-icon{width:31px;height:31px;display:grid;place-items:center;color:var(--green);flex-shrink:0}.row-icon svg{width:25px;height:25px}.inline-value{font-size:14px;color:var(--secondary);white-space:nowrap}.footnote{font-size:12px;color:#838389;line-height:1.7;margin:13px 5px 0}.muted{color:var(--secondary)}.pill{display:inline-flex;align-items:center;gap:5px;font-size:12px;line-height:1.4;font-weight:500;padding:5px 9px;border-radius:7px;background:#ececf0;color:var(--secondary)}.pill.green{background:var(--green-soft);color:var(--green)}.pill.orange{background:#fff0df;color:#9e641f}.member-nudge{display:flex;align-items:center;gap:13px;padding:18px;background:#e6eee9;border-radius:15px;width:100%;text-align:left;margin-top:23px}.member-nudge .row-body{flex:1}.member-nudge b{font-size:15px;font-weight:600}.member-nudge small{font-size:12px;color:#6a8074;display:block;margin-top:3px}.member-nudge svg{width:22px;height:22px;color:var(--green)}#tabs{display:flex;justify-content:space-around;gap:2px;padding:8px 9px max(13px,env(safe-area-inset-bottom));background:#ffffffed;backdrop-filter:blur(20px);border-top:1px solid #dcdce280;flex-shrink:0}#tabs button{flex:1;display:flex;align-items:center;flex-direction:column;gap:4px;background:none;color:#88888f;min-height:48px;padding:3px 2px}#tabs button svg{width:23px;height:23px}#tabs button span{font-size:10px;line-height:1.2;font-weight:550}#tabs button[aria-current=page]{color:var(--green)}.back{display:flex;align-items:center;gap:3px;background:none;color:var(--green);min-height:42px;padding:0;margin:-9px 0 16px;font-size:16px}.back svg{width:19px;height:19px}.course-intro{padding:24px;margin-bottom:22px}.course-intro .course-code{font-size:12px;color:var(--green);letter-spacing:1px;margin-bottom:15px}.course-intro h2{font-size:26px;line-height:1.3}.course-intro p{font-size:14px;color:var(--secondary);margin-top:12px}.course-number{font-size:14px;color:#9b9ba1;font-variant-numeric:tabular-nums;width:30px;flex-shrink:0}.note{padding:14px 16px;background:#eaeaef;border-radius:12px;font-size:13px;line-height:1.7;color:#707078;margin-top:22px}.quiz-progress{display:flex;justify-content:space-between;color:var(--secondary);font-size:14px;margin:5px 0 12px}.quiz-question{text-align:center;padding:33px 10px 27px}.quiz-question small{font-size:14px;color:var(--secondary)}.quiz-question h2{font-size:44px;line-height:1.3;margin:12px 0;font-weight:650;letter-spacing:-1px}.quiz-question p{font-size:14px;color:var(--secondary)}.options{display:flex;flex-direction:column;gap:11px}.option{min-height:57px;padding:13px 20px;background:white;border:1.5px solid transparent;border-radius:13px;font-size:20px;text-align:left;display:flex;align-items:center;justify-content:space-between;color:var(--text)}.option:disabled{opacity:1}.option.correct{border-color:#6fad89;background:#e8f5eb}.option.wrong{border-color:#d9a99e;background:#fbebe6}.option svg{width:20px;height:20px;color:var(--green)}.feedback{font-size:14px;line-height:1.7;color:#577361;margin:20px 0;min-height:44px}.feedback strong{font-weight:550;display:block;color:var(--text)}.score-card{text-align:center;padding:32px 22px}.score-number{font-size:72px;letter-spacing:-4px;font-weight:650;line-height:1.2;margin:25px 0 8px}.score-number small{font-size:26px;letter-spacing:0;color:#a1a1a8}.score-card p{font-size:14px;color:var(--secondary)}.word-grid{display:flex;gap:8px;flex-wrap:wrap;margin:25px 0}.word-grid button{background:white;border-radius:8px;padding:9px 12px;font-size:15px;color:var(--green);min-height:44px}.stack>*+*{margin-top:12px}.script-label{font-size:12px;color:var(--secondary);margin-top:-15px;margin-bottom:24px;display:flex;gap:5px;align-items:center}.chat{display:flex;flex-direction:column;gap:19px;margin:24px 0}.bubble{background:white;border-radius:17px 17px 17px 4px;padding:17px 18px;font-size:17px;line-height:1.55;align-self:flex-start;max-width:94%}.bubble small{display:block;font-size:13px;color:var(--secondary);margin-top:6px}.bubble.reply{background:#e2eee6;border-radius:17px 17px 4px 17px;align-self:flex-end;font-size:16px}.reply-label{font-size:13px;color:var(--secondary);margin-bottom:12px}.reply-choice{background:white;border-radius:12px;padding:16px 18px;color:var(--green);text-align:left;min-height:52px;width:100%;font-size:16px}.player{background:white;border-radius:18px;padding:30px 22px;margin-bottom:20px;min-height:270px;display:flex;flex-direction:column;justify-content:center;text-align:center}.player .scene{font-size:12px;color:#96969c;letter-spacing:.08em;margin-bottom:28px}.player h2{font-size:30px;line-height:1.3;letter-spacing:-.8px}.player p{font-size:15px;color:var(--secondary);margin-top:18px}.player .slide-dots{display:flex;justify-content:center;gap:7px;margin-top:28px}.slide-dots i{width:5px;height:5px;border-radius:50%;background:#d0d0d7}.slide-dots i.active{background:var(--green)}.player-controls{display:flex;align-items:center;justify-content:space-between;gap:12px}.player-controls button{background:white;border-radius:50%;width:46px;height:46px;display:grid;place-items:center}.player-controls button.main-control{background:var(--green);color:white;width:56px;height:56px}.player-controls button svg{width:23px;height:23px}.profile{display:flex;align-items:center;gap:15px;padding:20px;background:white;border-radius:17px;margin-bottom:25px}.avatar{width:52px;height:52px;background:#e8f2ec;color:var(--green);border-radius:50%;display:grid;place-items:center;font-size:23px;flex-shrink:0}.avatar svg{width:29px;height:29px}.profile h2{font-size:21px}.profile p{font-size:13px;color:var(--secondary);margin-top:5px}.profile>button{margin-left:auto;background:none;color:var(--green);font-size:14px;min-width:44px;min-height:44px}.stats{display:flex;background:white;border-radius:15px;padding:22px 12px}.stats>div{flex:1;text-align:center}.stats>div+div{border-left:1px solid var(--line)}.stats b{display:block;font-size:25px;font-weight:600;letter-spacing:-.5px}.stats span{font-size:12px;color:var(--secondary);display:block;margin-top:5px}.member-hero{padding:25px 22px;background:white;border-radius:18px}.member-hero .member-icon{width:39px;height:39px;color:var(--green);margin-bottom:19px}.member-hero h2{font-size:26px}.member-hero>p{font-size:14px;color:var(--secondary);margin:10px 0 20px}.member-hero .status-line{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:14px}.member-hero .status-line>span:first-child{font-size:14px;color:var(--secondary)}.benefit{display:flex;align-items:center;gap:12px;padding:17px 18px}.benefit+.benefit{border-top:1px solid var(--line);margin-left:18px;padding-left:0}.benefit svg{width:22px;height:22px;color:var(--green);flex-shrink:0}.benefit b{font-size:15px;display:block;font-weight:550}.benefit small{font-size:12px;color:var(--secondary);display:block;margin-top:3px}.membership-meta{font-size:13px;color:var(--secondary);margin-top:20px;display:flex;align-items:center;justify-content:space-between}.plans{display:flex;flex-direction:column;gap:12px;margin:23px 0}.plan-option{padding:18px;text-align:left;background:#f2f2f7;border:2px solid transparent;border-radius:14px;display:flex;gap:12px;align-items:center;width:100%}.plan-option[aria-checked=true]{background:#edf6ef;border-color:var(--green)}.radio{height:21px;width:21px;border:1.5px solid #c3c3ca;border-radius:50%;flex-shrink:0;display:grid;place-items:center}.plan-option[aria-checked=true] .radio{border:6px solid var(--green)}.plan-option .plan-copy{flex:1}.plan-option b{display:block;font-size:17px;font-weight:600}.plan-option small{display:block;font-size:12px;color:var(--secondary);margin-top:3px}.plan-option strong{font-size:23px;font-weight:650;letter-spacing:-.6px}.plan-option strong small{font-size:12px;font-weight:400;letter-spacing:0}.summary-list{background:#f2f2f7;border-radius:12px;overflow:hidden;margin:24px 0}.summary-list>div{display:flex;justify-content:space-between;gap:18px;padding:14px 16px;font-size:14px}.summary-list>div+div{border-top:1px solid var(--line)}.summary-list span{color:var(--secondary)}.summary-list b{font-weight:500;text-align:right}.account-demo{display:flex;align-items:center;gap:13px;padding:17px;background:#f2f2f7;border-radius:13px;margin:24px 0}.account-demo b{font-size:16px;display:block}.account-demo small{font-size:12px;color:var(--secondary);display:block;margin-top:4px}.check-row{display:flex;align-items:flex-start;gap:11px;font-size:14px;color:var(--secondary);line-height:1.65;margin:20px 0}.check-row input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--green);flex-shrink:0}.state-selector{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:23px 0}.state-selector button{border-radius:10px;background:#f2f2f7;font-size:14px;min-height:46px;padding:10px}.state-selector button.selected{background:var(--green);color:white}.warning{color:#996438;background:#fcf1e7;border-radius:10px;padding:13px 15px;font-size:13px;line-height:1.7;margin:20px 0}.success-mark{width:52px;height:52px;border-radius:50%;background:#e6f3eb;color:var(--green);display:grid;place-items:center;margin-bottom:24px}.success-mark svg{width:28px;height:28px}.legal-links{display:flex;gap:15px;flex-wrap:wrap;margin-top:22px;font-size:12px}.legal-links a{text-decoration:underline;text-underline-offset:3px}dialog{border:0;padding:0 23px 27px;background:white;color:var(--text);width:min(430px,100%);max-width:none;max-height:90dvh;border-radius:24px 24px 0 0;margin:auto auto 0;overflow:auto;overscroll-behavior:contain;box-shadow:0 -10px 60px #0002;font-family:var(--font)}dialog::backdrop{background:#14172266;backdrop-filter:blur(3px)}.sheet-grabber{width:34px;height:5px;background:#d1d1d6;border-radius:5px;margin:10px auto 0}.sheet-top{display:flex;align-items:center;justify-content:space-between;margin:2px 0 15px;gap:10px}.sheet-top>span{font-size:12px;color:#8f8f96}.sheet-spacer{width:35px}.sheet-top .text-button{font-size:15px}.sheet-title{font-size:27px;line-height:1.3;letter-spacing:-.6px;font-weight:700;margin-bottom:12px}.sheet-description{font-size:14px;color:var(--secondary);line-height:1.7}.sheet-section{font-size:16px;margin:23px 0 12px}.sheet-body-text{font-size:14px;color:var(--secondary);line-height:1.8}.sheet-body-text p+p{margin-top:13px}#toast{position:fixed;left:50%;bottom:max(100px,calc(env(safe-area-inset-bottom) + 85px));transform:translate(-50%,15px);background:#26262beb;color:#fff;border-radius:12px;font-size:14px;padding:13px 18px;opacity:0;pointer-events:none;transition:.2s;max-width:calc(100% - 40px);width:max-content;z-index:100;box-shadow:0 5px 25px #0002}#toast.show{opacity:1;transform:translate(-50%,0)}.loading-view{color:var(--secondary);padding:40px;text-align:center}.expired-text{color:#9b6d30}.button-row{display:flex;gap:12px}.button-row>*{flex:1}.privacy-list{font-size:14px;color:var(--secondary);line-height:1.9;padding-left:20px}.privacy-list li{margin-bottom:8px}.mini-note{font-size:11px;color:#939399;line-height:1.6;margin-top:17px}.plain-card{padding:22px}.table-value{font-variant-numeric:tabular-nums}@media(max-width:500px){body{background:var(--bg)}.device{width:100%;height:100dvh;max-height:none;margin:0;border:0;border-radius:0;box-shadow:none}.app-header{padding-top:max(14px,env(safe-area-inset-top));min-height:calc(53px + env(safe-area-inset-top))}dialog{padding-bottom:max(27px,calc(env(safe-area-inset-bottom) + 15px));max-height:92dvh}#screen{padding-top:16px}}@media(min-width:501px){dialog{margin:auto;max-height:calc(100dvh - 80px);border-radius:24px}}@media(max-width:360px){#screen{padding-left:20px;padding-right:20px}.app-header{padding-left:20px;padding-right:20px}h1{font-size:31px}.continue-card{padding:20px}.continue-card h2{font-size:24px}#tabs button span{font-size:10px}.option{min-height:53px}.quiz-question{padding-top:24px;padding-bottom:22px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

.card-meta{display:flex;justify-content:space-between;font-size:13px;color:var(--secondary);margin:-9px 3px 13px}.word-card{background:white;border-radius:19px;padding:30px 25px;text-align:center}.card-word{font-size:48px;font-weight:650;letter-spacing:-1.8px;line-height:1.3}.phonetic{font-size:15px;color:#939399;margin-top:9px}.card-meaning{font-size:22px;margin-top:20px}.card-sentence{border-top:1px solid var(--line);padding-top:23px;margin-top:25px;font-size:21px;letter-spacing:-.3px}.card-sentence small{display:block;color:var(--secondary);font-size:14px;margin-top:9px}.card-audio{padding:17px 17px 15px;margin-top:17px}.audio-label{display:flex;gap:10px;align-items:center;margin-bottom:12px}.audio-label b{font-size:15px;font-weight:600;display:block}.audio-label small{font-size:11px;display:block;color:var(--secondary);margin-top:3px}.card-audio audio{width:100%;height:40px;display:block}.card-audio .footnote{font-size:11px;margin:10px 0 0}.card-audio a{text-decoration:underline;text-underline-offset:2px}
/* Audio and video UI prototype: media are the primary learning surfaces. */
.media-section-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:25px 0 12px}.media-section-head h2{font-size:20px;letter-spacing:-.35px}.media-section-head>.text-button{min-height:30px;padding:0;font-size:14px}.media-section-head>.muted{font-size:13px}.home-audio-card{display:flex;align-items:center;gap:15px;padding:18px 17px;background:white;border-radius:17px;width:100%;text-align:left}.audio-cover{width:67px;min-width:67px;height:81px;background:#e7f0e9;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:10px;color:#397855;border:1px solid #dae7dc}.audio-cover b{font-size:31px;letter-spacing:-1.4px;font-weight:600}.audio-cover small{font-size:6px;letter-spacing:.7px;margin-top:3px}.home-media-copy{display:flex;flex-direction:column;flex:1;min-width:0}.home-media-copy>small{font-size:11px;color:var(--secondary);margin-bottom:4px}.home-media-copy>b{font-size:23px;line-height:1.3;font-weight:650;letter-spacing:-.5px}.home-media-copy>span{font-size:12px;color:var(--secondary);margin-top:4px}.home-media-copy>.media-resume{font-variant-numeric:tabular-nums;font-size:11px;color:#96969d;margin-top:8px}.home-play{width:34px;height:34px;min-width:34px;border-radius:50%;background:var(--green);color:white;display:grid;place-items:center}.home-play svg{width:16px;height:16px;fill:currentColor;stroke-width:1}.home-video-card{background:white;border-radius:17px;overflow:hidden;display:block;width:100%;padding:0;text-align:left}.video-poster{position:relative;display:block;aspect-ratio:16/9;overflow:hidden;background:#173629;color:white}.video-poster>img{width:100%;height:100%;object-fit:cover;display:block}.poster-shade{position:absolute;inset:0;background:linear-gradient(180deg,#10271d18 40%,#10271d9e)}.poster-badge{position:absolute;top:12px;left:12px;background:#10282083;border:1px solid #ffffff24;border-radius:5px;padding:4px 7px;font-size:9px;color:#edf4ed;backdrop-filter:blur(8px)}.poster-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:46px;height:46px;border-radius:50%;background:#ffffffee;color:#224b35;display:grid;place-items:center;box-shadow:0 2px 15px #0001}.poster-play svg{width:21px;height:21px;fill:currentColor;stroke-width:1.1}.poster-duration{position:absolute;bottom:12px;right:12px;font-size:11px;background:#142920a6;padding:2px 6px;border-radius:4px;font-variant-numeric:tabular-nums}.home-video-copy{display:flex;align-items:center;justify-content:space-between;padding:16px 17px;gap:15px}.home-video-copy b{font-size:17px;display:block;font-weight:600}.home-video-copy small{font-size:12px;color:var(--secondary);display:block;margin-top:5px}.lesson-tag{font-size:11px;color:#82898a;white-space:nowrap}.home-prototype-note{font-size:10px;margin:12px 3px 0}.home-prototype-note+.member-nudge{margin-top:20px;padding:15px 16px}.home-prototype-note+.member-nudge b{font-size:14px}.home-prototype-note+.member-nudge small{font-size:11px}.track-icon{width:34px;height:38px;display:grid;place-items:center;flex-shrink:0}.audio-icon{color:var(--green);background:#edf4ee;border-radius:8px}.track-icon svg{width:20px;height:20px}.video-course-list{background:#fff;border-radius:16px;padding:0 15px;overflow:hidden}.video-course-row{display:flex;align-items:center;gap:12px;padding:16px 0;width:100%;background:#fff;text-align:left}.video-course-row+.video-course-row{border-top:1px solid var(--line)}.lesson-thumbnail{width:88px;min-width:88px;aspect-ratio:16/9;border-radius:7px;position:relative;overflow:hidden;background:#234a32}.lesson-thumbnail img{display:block;width:100%;height:100%;object-fit:cover}.lesson-thumbnail>svg{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);color:white;fill:white;width:16px;height:16px;filter:drop-shadow(0 2px 6px #0006)}.video-course-row>span:nth-child(2){flex:1}.video-course-row b{font-size:15px;line-height:1.5;font-weight:550;display:block}.video-course-row 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