@charset "UTF-8";
:root{--bg:#f7f8f2;--paper:#fffefa;--ink:#253c32;--muted:#6e786e;--line:#e3e7dc;--green:#294f3e;--sage:#e5eccf;--peach:#f5e1d2;--lilac:#ebe5f2;--blue:#e3ecf1;--radius:18px;font-family:"Segoe UI","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}button:disabled{cursor:not-allowed;opacity:.45}a{color:var(--green);text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #bb7c40;outline-offset:4px}button{border:0;background:none}h1,h2,h3,p{margin:0}h1{font-size:clamp(28px,3vw,38px);font-weight:600;letter-spacing:-1.5px;line-height:1.35}h2{font-size:21px;font-weight:600;letter-spacing:-.5px}h3{font-size:17px;font-weight:600}p{line-height:1.8}small,.small{font-size:12px}strong{font-weight:600}.muted{color:var(--muted)}.english{font-family:Georgia,"Times New Roman",serif}.mono{font-family:Consolas,monospace}.skip{position:fixed;top:-80px;z-index:100;background:white;padding:12px}.skip:focus{top:0}.sidebar{position:fixed;inset:0 auto 0 0;width:220px;background:#f0f2e9;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:36px 22px;z-index:10}.brand{display:flex;gap:11px;align-items:center;padding:0 8px;text-align:left}.brand img{width:37px;height:37px}.brand-name{font-size:23px;letter-spacing:4px}.brand small{display:block;font-size:10px;letter-spacing:2px;color:var(--muted);margin-top:2px}.nav{display:grid;gap:8px;margin-top:55px}.nav button{display:flex;align-items:center;gap:14px;text-align:left;padding:14px 15px;border-radius:9px;font-size:14px;color:#6b776c}.nav button.active{background:#e0e7d3;color:#284e3c;font-weight:600}.nav button:hover{background:#e6eadd}.nav .symbol{font-size:20px;width:24px;text-align:center;font-family:Georgia,serif}.nav .count{margin-left:auto;font-size:11px;background:#cedabf;padding:2px 7px;border-radius:5px}.side-bottom{margin-top:auto;padding:20px 9px 0}.side-bottom .plant{font-size:39px;color:#6d8b64;line-height:1;margin-bottom:18px}.side-bottom p{font-size:12px;line-height:1.9;color:#798371}.side-bottom button{margin-top:25px;padding:10px 0;display:flex;gap:10px;font-size:13px}.workspace{margin-left:220px}.topbar{height:83px;padding:0 44px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:12px}.language{display:flex;gap:10px;align-items:center}.lang-icon{width:27px;height:27px;border:1px solid #bfc9b8;display:grid;place-items:center;border-radius:50%;font-size:10px}.top-right{display:flex;align-items:center;gap:22px}.target{color:#586750}.avatar{width:32px;height:32px;background:#ead8c6;border-radius:50%;display:grid;place-items:center;font-size:13px}.main{max-width:1240px;margin:auto;padding:36px 44px 55px}.page-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:27px;gap:20px}.page-heading p{margin-top:9px;font-size:13px;color:var(--muted)}.date-note{font-size:12px;color:var(--muted);white-space:nowrap}.home-layout{display:grid;grid-template-columns:minmax(0,1fr) 248px;gap:24px}.feature{background:#e1e9ce;border-radius:var(--radius);min-height:301px;position:relative;overflow:hidden;padding:31px;display:flex;align-items:center}.feature-copy{position:relative;z-index:1;max-width:62%}.eyebrow{font-size:11px;letter-spacing:1.7px;font-weight:600;color:#5c7151;margin-bottom:19px}.feature h2{font-size:clamp(28px,3vw,40px);line-height:1.35;letter-spacing:-1.8px;font-weight:500}.feature p{font-size:12px;color:#607058;margin:12px 0 22px;max-width:230px}.feature-art{position:absolute;width:54%;max-width:350px;right:-15px;bottom:-5px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:15px;background:var(--green);color:#fffefa;padding:12px 20px;border-radius:8px;font-size:13px;min-height:43px;text-decoration:none;transition:background .18s,transform .18s}.btn:hover{background:#3f674e}.btn:active{transform:scale(.98)}.btn.secondary{background:#edf0e6;color:var(--ink);border:1px solid #dfe4d6}.btn.plain{background:transparent;color:var(--green);border:1px solid var(--line)}.btn.danger{background:#f6e2dc;color:#854634}.btn.small{padding:8px 13px;min-height:35px;font-size:12px}.arrow{font-size:19px}.panel{border:1px solid var(--line);background:var(--paper);border-radius:var(--radius);padding:23px}.week-panel{padding:24px 20px}.label{font-size:12px;color:var(--muted)}.big-number{font-size:47px;font-weight:400;letter-spacing:-2px;line-height:1.25}.big-number small{font-size:13px;margin-left:8px;letter-spacing:0;color:var(--muted)}.days{display:flex;justify-content:space-between;gap:3px;margin:23px 0 17px}.day{display:flex;flex-direction:column;align-items:center;font-size:10px;gap:9px;color:#78816f}.day i{font-style:normal;width:24px;height:24px;border-radius:50%;background:#eff1e8;display:grid;place-items:center;font-size:11px}.day.done i{background:#48694c;color:white}.day.today i{outline:1px solid #74916a;outline-offset:2px}.week-panel .hint{border-top:1px solid var(--line);padding-top:15px;color:#74816d;font-size:11px;line-height:1.8}.section-head{display:flex;justify-content:space-between;align-items:center;margin:31px 0 17px}.text-link{font-size:12px;color:#6c795f;padding:5px}.course-row{display:grid;grid-template-columns:55px 1fr auto;gap:15px;align-items:center;padding:17px 0;border-bottom:1px solid var(--line);text-align:left;width:100%}.course-row:last-child{border-bottom:0}.course-icon{width:50px;height:54px;border-radius:10px;background:var(--sage);display:grid;place-items:center;font-family:Georgia,serif;font-size:21px;position:relative}.course-icon.peach{background:var(--peach)}.course-icon.lilac{background:var(--lilac)}.course-icon.blue{background:var(--blue)}.course-row h3{font-size:14px;margin-bottom:5px}.course-row p{font-size:11px;color:var(--muted)}.course-row:hover h3{color:#718c50}.course-meta{font-size:11px;color:var(--muted);display:flex;gap:13px;align-items:center}.subtle-tag{font-size:10px;color:#53674b;background:#eff2e7;padding:4px 7px;border-radius:4px}.right-stack{display:grid;align-content:start;gap:19px}.quote-panel{background:#eee8dc;border:0}.quote-panel .english{font-size:24px;line-height:1.45;margin:18px 0 10px}.quote-panel p{font-size:11px;color:#7c796b}.mini-play{margin-top:16px;padding:0;font-size:12px;text-align:left;color:#687354}.path-strip{margin-top:27px;border-top:1px solid var(--line);padding-top:20px}.path-steps{display:flex;gap:0;margin-top:17px}.path-step{flex:1;position:relative;font-size:11px;color:#65765d}.path-step:before{content:'';position:absolute;left:24px;right:8px;top:9px;height:1px;background:#cfd8c5}.path-step:last-child:before{display:none}.path-node{width:20px;height:20px;border:1px solid #becbb2;background:var(--bg);display:grid;place-items:center;border-radius:50%;margin-bottom:9px;font-size:9px;position:relative}.path-step.current .path-node{background:var(--green);color:white;border-color:var(--green)}.footer-note{margin-top:30px;color:#808978;font-size:11px;display:flex;justify-content:space-between;gap:15px}.filters,.tabs{display:flex;gap:8px;margin-bottom:24px;flex-wrap:wrap}.chip{border:1px solid var(--line);border-radius:7px;padding:9px 17px;font-size:12px;background:var(--paper)}.chip.active{background:var(--green);color:#fff;border-color:var(--green)}.stage-section{margin-bottom:30px}.stage-title{display:flex;align-items:center;gap:13px;margin-bottom:15px}.stage-title b{background:var(--sage);padding:8px 13px;border-radius:8px;font-size:13px}.stage-title p{font-size:12px;color:var(--muted);margin-top:3px}.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.course-card{padding:22px;border:1px solid var(--line);border-radius:12px;background:var(--paper);text-align:left;transition:transform .18s,border-color .18s}.course-card:hover{transform:translateY(-2px);border-color:#a8ba99}.course-card .meta{display:flex;justify-content:space-between;margin-bottom:17px;font-size:10px;color:#748169}.course-card h3{margin-bottom:8px}.course-card .english{font-size:17px;color:#7c8576}.course-card 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h2{margin-bottom:13px}.exam-body>.muted{font-size:13px;margin-bottom:22px}.reading-text{font-family:Georgia,serif;font-size:18px;line-height:1.9;max-width:760px}.reading-text p{margin:18px 0}.source-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:20px}.source{padding:19px;border:1px solid var(--line);border-radius:10px;text-decoration:none;background:var(--paper)}.source h3{font-size:13px;margin-bottom:8px}.source p{font-size:11px;color:var(--muted)}.questions{display:grid;gap:18px;margin-top:24px}.question{border:1px solid var(--line);border-radius:12px;padding:19px}.question h3{font-size:15px;line-height:1.6;margin-bottom:13px}.options{display:grid;gap:8px}.option{border:1px solid var(--line);padding:12px 15px;text-align:left;border-radius:7px;font-size:13px;display:flex;gap:12px;align-items:center;background:white}.option:hover{border-color:#8da17d}.option.correct{border-color:#799b69;background:#eef4e5}.option.wrong{border-color:#c78d79;background:#fbeee8}.option.selected{background:#eef1e6;border-color:#8b9d7c}.explanation{padding:12px 0 0;font-size:12px;color:#6b795f;line-height:1.7}.answer-input{display:block;border:1px solid #cbd3c2;border-radius:7px;padding:11px 13px;background:white;max-width:100%;width:360px;margin-top:10px}.audio-box{background:#f0f3e7;border-radius:12px;padding:16px;margin:19px 0}.audio-box audio{width:100%;height:40px}.audio-label{font-size:11px;color:#6b7c5d;margin-bottom:9px}.audio-controls{display:flex;gap:15px;align-items:center;font-size:12px;margin-top:10px}select{border:1px solid #cbd3c2;border-radius:6px;background:var(--paper);color:var(--ink);padding:7px 11px;max-width:100%}.writing-area{width:100%;min-height:280px;border:1px solid #cdd5c4;border-radius:10px;resize:vertical;padding:20px;font:17px/1.85 Georgia,serif;color:#344437;background:#fff;margin:15px 0 5px}.writing-meta{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin:7px 0 20px}.timer-row{display:flex;gap:12px;align-items:center;margin:20px 0;flex-wrap:wrap}.clock{font:28px Consolas,monospace;letter-spacing:1px;min-width:90px}.checklist{display:grid;gap:12px;margin:20px 0}.checklist label{display:flex;gap:10px;font-size:13px;line-height:1.7;align-items:flex-start}.checklist input{margin-top:5px;accent-color:var(--green);width:16px;height:16px}.notice{padding:14px 17px;border-radius:8px;background:#f4f1e7;font-size:12px;color:#77715b;line-height:1.8;margin:15px 0}.chart-table{width:100%;max-width:600px;border-collapse:collapse;margin:20px 0;font-size:14px}.chart-table th,.chart-table td{padding:13px;border-bottom:1px solid var(--line);text-align:left}.chart-table th{background:#edf1e6}.record-box{border:1px solid var(--line);border-radius:12px;padding:20px;margin:20px 0;background:#fafbf6}.record-box h3{font-size:14px;margin-bottom:9px}.record-status{font-size:12px;color:var(--muted);margin-bottom:15px}.record-actions{display:flex;gap:10px;flex-wrap:wrap}.record-live{color:#a0513d}.record-box audio{width:100%;margin-top:15px}.recording-item{border-top:1px solid var(--line);padding:15px 0;margin-top:14px}.recording-item a{font-size:12px}.recording-item small{display:block;margin-bottom:5px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:25px}.stat-card{padding:25px;border:1px solid var(--line);border-radius:14px;background:var(--paper)}.heatmap{display:grid;grid-template-columns:repeat(14,1fr);gap:7px;margin:22px 0}.heatmap span{aspect-ratio:1;background:#e8edde;border-radius:4px}.heatmap span.done{background:#7f9a68}.heatmap span.today{outline:2px solid #3d6047;outline-offset:2px}.passport{display:flex;flex-wrap:wrap;gap:16px;padding:20px 0}.stamp{width:117px;min-height:108px;border:2px dotted #98a889;padding:15px 8px;text-align:center;transform:rotate(-3deg);color:#617752;background:#f0f3e6}.stamp:nth-child(2n){transform:rotate(3deg)}.stamp strong{display:block;font-size:13px;margin:12px 0 7px}.stamp small{font-size:10px}details{margin:17px 0}summary{cursor:pointer;font-size:13px;padding:12px 0;color:#627556}details p{font-size:13px;margin-top:8px}.model{font:17px/1.9 Georgia,serif;white-space:pre-wrap;padding:20px;background:#f1f3ea;border-radius:10px}.split{display:grid;grid-template-columns:1fr 1fr;gap:20px}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.spaced{margin-top:24px}.field{display:grid;gap:9px;margin:20px 0;font-size:13px}.field select{width:100%}
dialog{border:1px solid var(--line);border-radius:20px;padding:0;background:var(--paper);color:var(--ink);max-width:860px;width:calc(100% - 40px);max-height:92dvh;box-shadow:0 16px 90px #20341f20}dialog::backdrop{background:#24342369;backdrop-filter:blur(4px)}.dialog-head{position:sticky;top:0;z-index:3;background:var(--paper);padding:21px 28px 17px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:15px}.dialog-head h2{font-size:17px}.dialog-head p{font-size:11px;color:var(--muted);margin-top:5px}.close{width:35px;height:35px;background:#f0f2e9;border-radius:50%;font-size:22px;flex-shrink:0}.lesson-track{display:flex;padding:18px 28px;gap:8px;border-bottom:1px solid var(--line);overflow:auto}.lesson-track span{flex:1;font-size:10px;color:#8b9384;white-space:nowrap;padding-bottom:7px;border-bottom:2px solid #e6eadd}.lesson-track span.current{color:var(--green);border-color:var(--green);font-weight:600}.lesson-track span.past{color:#718763;border-color:#aec39b}.lesson-body{padding:27px 33px;min-height:360px}.lesson-body h3.step-title{font-size:23px;margin-bottom:10px}.lesson-body>.muted{font-size:13px}.lesson-footer{position:sticky;bottom:0;display:flex;justify-content:space-between;align-items:center;padding:16px 28px;background:var(--paper);border-top:1px solid var(--line);gap:15px}.transcript{display:grid;gap:13px;margin-top:20px}.line{padding:13px 16px;border-left:2px solid #d0dbc3;background:#f7f8f0}.line .english{font-size:18px;line-height:1.6}.line .zh{font-size:12px;color:var(--muted);margin-top:6px}.line button{padding:4px 10px 4px 0;font-size:11px;color:#667e54}.phrase-card{padding:19px;border:1px solid var(--line);border-radius:11px;margin:12px 0}.phrase-card .english{font-size:21px;line-height:1.5}.phrase-card p{font-size:12px;margin-top:9px;color:var(--muted)}.phrase-actions{display:flex;gap:12px;margin-top:13px}.success{text-align:center;padding:25px 0}.success .seal{width:88px;height:88px;border:2px dashed #9cab7a;border-radius:50%;display:grid;place-items:center;font-size:37px;color:#648052;margin:0 auto 24px;background:#edf3df}.success h2{font-size:27px;margin-bottom:12px}.success p{font-size:13px;color:var(--muted)}#settings-dialog{max-width:490px}.settings-body{padding:25px 30px}#toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);background:#2c4535;color:white;border-radius:10px;padding:14px 22px;z-index:100;font-size:13px;max-width:90%;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s}#toast.show{opacity:1;transform:translate(-50%,0)}.screen-enter{animation:enter .3s ease-out}@keyframes enter{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1450px){.feature{min-height:330px}.feature-art{width:54%;max-width:380px}.feature-copy{max-width:58%}}
@media(max-width:1150px){.sidebar{width:185px;padding:30px 15px}.workspace{margin-left:185px}.main{padding:30px 26px}.topbar{padding:0 26px}.home-layout{grid-template-columns:minmax(0,1fr) 225px;gap:18px}.feature{padding:24px}.feature h2{font-size:30px}.feature-art{right:-24px;width:57%}.course-meta .time{display:none}}
@media(max-width:940px){.sidebar{width:164px}.workspace{margin-left:164px}.home-layout{grid-template-columns:1fr}.right-stack{grid-template-columns:1fr 1fr;gap:17px}.feature{min-height:285px}.feature-art{width:50%;max-width:320px;right:10px}.feature-copy{max-width:60%}.nav button{padding:12px 9px;gap:9px}.main{padding:28px 25px}.side-bottom{padding:18px 3px}.date-note{display:none}.heatmap{gap:5px}}
@media(max-width:640px){.sidebar{width:auto;inset:auto 0 0;height:70px;padding:0;background:#f6f7ef;border-top:1px solid var(--line);border-right:0;z-index:15}.brand,.side-bottom{display:none}.nav{display:flex;justify-content:space-around;margin:0;gap:0;height:100%;align-items:center}.nav button{flex-direction:column;gap:2px;padding:7px 8px;font-size:10px;background:none!important;min-width:56px}.nav button.active{color:#2d593e}.nav .symbol{font-size:21px}.nav .count{display:none}.workspace{margin-left:0}.topbar{height:65px;padding:0 20px}.top-right{gap:13px}.main{padding:25px 19px 98px}.page-heading{margin-bottom:23px}.page-heading h1{font-size:29px}.page-heading p{font-size:12px}.feature{min-height:290px;padding:24px}.feature h2{font-size:29px}.feature-copy{max-width:70%}.feature-art{width:65%;right:-50px;bottom:-14px;opacity:.83}.feature p{max-width:160px;font-size:11px}.feature .eyebrow{font-size:10px}.btn{padding:11px 16px;gap:10px}.course-grid{grid-template-columns:1fr}.right-stack{grid-template-columns:1fr}.quote-panel{display:none}.week-panel{padding:20px}.week-panel .days{margin:17px 0}.big-number{font-size:38px}.week-panel .big-number{float:right;margin-top:-21px}.day i{width:30px;height:30px}.course-row{grid-template-columns:45px 1fr auto;gap:11px}.course-icon{width:43px;height:48px}.course-meta{gap:5px}.course-row h3{font-size:13px}.course-row p{font-size:10px}.course-meta .subtle-tag{display:none}.footer-note{font-size:10px;line-height:1.8}.stats-grid{gap:9px}.stat-card{padding:16px 12px}.stat-card .big-number{font-size:30px}.stat-card .label{font-size:10px}.exam-banner{align-items:flex-start;flex-direction:column}.exam-body{padding:20px 17px}.source-grid,.split{grid-template-columns:1fr}.tabs,.filters{gap:6px}.chip{padding:9px 12px;font-size:11px}.reading-text{font-size:17px}.option{font-size:12px}.question{padding:15px}dialog{max-height:96dvh;width:calc(100% - 18px);border-radius:14px}.dialog-head{padding:16px}.lesson-track{padding:14px 16px;gap:6px}.lesson-track span{font-size:9px}.lesson-body{padding:23px 18px}.lesson-footer{padding:14px 16px}.lesson-footer .muted{font-size:10px;max-width:100px}.writing-area{padding:14px;font-size:16px}.stamp{width:97px}.settings-body{padding:20px}.topbar .target{font-size:11px}}
.mobile-break{display:none}
@media(max-width:640px){.mobile-break{display:block}.page-heading h1{font-size:27px;line-height:1.45;letter-spacing:-1px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Explicit touch affordances and vocabulary practice. */
button,.btn,.btn.small,.chip,.close,.avatar,summary{min-height:44px}.close,.avatar{min-width:44px}.mini-play,.line button{display:inline-flex;align-items:center;gap:8px;background:#f9fbf2;border:1px solid #899c75;border-radius:9px;padding:11px 15px;font-size:13px;font-weight:600;min-height:44px}.mini-play:hover,.line button:hover{background:#dfe8d0}.playing{background:#294f3e!important;color:white!important}.text-link{min-height:44px;text-decoration:underline;text-underline-offset:4px}.phrase-actions,.review-actions{flex-wrap:wrap}.vocabulary-entry{display:flex;align-items:center;justify-content:space-between;gap:18px;margin:18px 0 26px;background:#f0f3e6}.vocabulary-entry h3{margin:8px 0}.vocabulary-entry .btn{flex-shrink:0}.word-body{text-align:center;min-height:410px}.word-body progress{width:100%;height:7px;accent-color:var(--green);margin:20px 0 32px}.word-meaning{font-size:25px}.word-english{font:42px/1.5 Georgia,serif;margin:12px 0 24px;overflow-wrap:anywhere}.word-body .answer-input{margin:0 auto 16px;text-align:center;font-size:20px}.word-feedback{min-height:52px;font-size:14px;color:#326b38}.word-feedback.retry{color:#9a4a30}input,select{font-size:16px}.checklist label,.audio-controls label{min-height:44px;align-items:center}.audio-controls{flex-wrap:wrap}.course-card,.course-row,.feature-copy{min-width:0}.course-card h3,.course-row h3{overflow-wrap:anywhere}.quote-panel{display:block}
@media(max-width:1150px) and (min-width:941px){.home-layout{grid-template-columns:1fr}.right-stack{grid-template-columns:1fr 1fr}.feature-art{max-width:320px}.feature{min-height:285px}}
@media(max-width:640px){.vocabulary-entry{align-items:stretch;flex-direction:column;padding:20px}.sidebar{height:calc(70px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom)}.main{padding-bottom:calc(100px + env(safe-area-inset-bottom))}.lesson-footer{padding-bottom:calc(14px + env(safe-area-inset-bottom))}.word-english{font-size:36px}.word-meaning{font-size:23px}.quote-panel{display:block}.feature-copy{max-width:77%}.feature .btn{font-size:12px}.lesson-footer .btn{max-width:75%}.audio-controls{gap:8px}.footer-note{flex-wrap:wrap}}