@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Libre+Caslon+Display&display=swap');
:root{--paper:#f7f8f2;--ink:#253b31;--muted:#7c847c;--line:#e0e5d9;--green:#344f3e;--lime:#d7e7a4;--white:#fff;--serif:'Libre Caslon Display',Georgia,serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px 'DM Sans',-apple-system,BlinkMacSystemFont,'PingFang TC',sans-serif}button,input,textarea,select{font:inherit}button,a,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.4;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #a4ba6d;outline-offset:3px}a{color:inherit}button{color:inherit}.shell{display:grid;grid-template-columns:238px 1fr;min-height:100vh}.rail{position:fixed;inset:0 auto 0 0;width:238px;background:#f0f3e9;border-right:1px solid var(--line);padding:34px 24px;display:flex;flex-direction:column;z-index:10}.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:18px;letter-spacing:-.6px}.brandmark{width:34px;height:36px;background:var(--green);border-radius:11px 11px 4px 11px;color:var(--lime);display:grid;place-items:center;font-family:var(--serif);font-size:26px}.brand small{display:block;font-size:10px;letter-spacing:2px;font-weight:500;margin-top:3px;color:var(--muted)}.nav{display:grid;gap:8px;margin-top:48px}.nav button{border:0;background:transparent;text-align:left;padding:13px 16px;border-radius:9px;font-size:14px;display:flex;gap:13px;align-items:center;color:#747e70}.nav button.active{background:#dfe8d3;color:var(--green);font-weight:700}.nav .ico{font-size:18px;width:21px;text-align:center}.rail-note{margin-top:auto;border:1px solid #d8dfcd;border-radius:12px;padding:17px;font-size:12px;line-height:1.9}.rail-note strong{display:block;margin:4px 0}.rail-bottom{font-size:11px;color:var(--muted);margin-top:23px}.main{grid-column:2;padding:0 48px 40px;max-width:1560px;width:100%;margin:auto}.topbar{height:87px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:12px;color:var(--muted)}.topbar .right{display:flex;align-items:center;gap:17px}.pill{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:30px;padding:7px 12px;font-size:11px;color:#63725e;background:#ffffff80}.dot{width:6px;height:6px;border-radius:50%;background:#759450}.avatar{width:32px;height:32px;background:var(--green);color:#eff5e2;border-radius:50%;display:grid;place-items:center;font:18px var(--serif)}.eyebrow{font-size:10px;letter-spacing:2.2px;font-weight:700;color:#7b896f;text-transform:uppercase}.heading{display:flex;justify-content:space-between;align-items:flex-end;padding:35px 0 28px;gap:20px}.heading h1{font-size:30px;letter-spacing:-1px;margin:8px 0 10px;font-weight:600}.heading p{color:var(--muted);font-size:13px;margin:0;line-height:1.8}.date{font-size:11px;color:var(--muted);white-space:nowrap;margin-bottom:6px}.hero{border-radius:16px;background:var(--green);color:#f8f9f0;padding:33px 36px;display:grid;grid-template-columns:1.4fr 1fr;gap:25px;overflow:hidden;position:relative}.hero .eyebrow{color:#bed19d}.hero h2{font:48px/1.05 var(--serif);margin:16px 0 12px;max-width:410px}.hero p{font-size:12px;line-height:1.9;color:#c3d0bf;max-width:400px}.hero .btn{margin-top:14px}.btn{border:0;border-radius:7px;padding:12px 19px;background:var(--green);color:white;font-size:12px;font-weight:600;display:inline-flex;gap:18px;align-items:center;justify-content:center;text-decoration:none}.btn.lime{background:var(--lime);color:#2b412f}.btn.secondary{background:#edf1e6;color:var(--green);border:1px solid var(--line)}.btn.ghost{background:transparent;color:var(--green);border:1px solid var(--line)}.btn.small{padding:8px 12px;font-size:11px}.hero-art{display:flex;align-items:center;justify-content:center;position:relative;min-height:220px}.rings{width:235px;height:235px;border:1px solid #688260;border-radius:50%;position:relative;display:grid;place-items:center;transform:rotate(-12deg)}.rings:before,.rings:after{content:'';position:absolute;border:1px solid #688260;border-radius:50%;inset:24px}.rings:after{inset:50px}.sound{display:flex;align-items:center;gap:5px;z-index:1}.sound i{display:block;width:6px;height:35px;background:#d8e8b0;border-radius:5px}.sound i:nth-child(2n){height:65px}.sound i:nth-child(3n){height:93px}.sound i:nth-child(5){height:120px}.art-label{position:absolute;font-size:10px;background:#47604a;border:1px solid #6c8064;border-radius:6px;padding:8px 13px;transform:rotate(0deg)}.art-label.one{left:8%;top:17%}.art-label.two{right:0;bottom:14%;background:#dbe7be;color:#344b3d}.stats{display:grid;grid-template-columns:repeat(3,1fr);margin:23px 0 30px;border:1px solid var(--line);border-radius:12px;background:#fff8}.stat{padding:19px 23px;display:flex;justify-content:space-between;align-items:center}.stat+.stat{border-left:1px solid var(--line)}.stat label{font-size:11px;color:var(--muted);display:block;margin-bottom:8px}.stat b{font-size:25px;font-weight:500;letter-spacing:-1px}.stat small{font-size:11px;font-weight:400;color:var(--muted);letter-spacing:0;margin-left:5px}.stat-icon{font-size:22px;color:#a6b193}.section-head{display:flex;align-items:center;justify-content:space-between;margin:0 0 19px;gap:15px}.section-head h2{margin:0;font-size:17px;font-weight:600}.section-head small{font-size:11px;color:var(--muted);margin-left:12px;font-weight:400}.filters{display:flex;gap:5px;flex-wrap:wrap}.filters button{border:0;background:transparent;border-radius:5px;padding:7px 13px;font-size:11px;color:var(--muted)}.filters button.active{background:var(--green);color:white}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.course{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:transform .2s}.course:hover{transform:translateY(-4px)}.course-art{height:125px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center}.sage{background:#e4ead8}.sand{background:#eee7d8}.rose{background:#eedfda}.blue{background:#dce5e8}.course-art .level{position:absolute;left:14px;top:13px;background:#fff9;border-radius:5px;padding:4px 8px;font-size:10px;font-weight:700}.drawing{width:80px;height:65px;border:1.5px solid #7f9277;border-radius:50% 50% 6px 6px;position:relative;transform:rotate(-12deg)}.drawing:after{content:'Aa';font:53px var(--serif);position:absolute;left:17px;top:-7px;color:#5d7156}.sand .drawing{border-color:#9c8e71;border-radius:5px;transform:rotate(9deg)}.sand .drawing:after{content:'↗';color:#8b7b5f}.rose .drawing{border-color:#aa897d;border-radius:0;transform:rotate(-5deg);height:69px}.rose .drawing:after{content:'⌂';color:#96756c;font-size:59px;top:-20px}.blue .drawing{border-color:#82969c;transform:rotate(12deg);border-radius:50%}.blue .drawing:after{content:'“ ”';color:#6e858b;font-size:50px;left:13px;top:4px}.course-body{padding:17px}.course .tag{font-size:9px;color:var(--muted);letter-spacing:1px}.course h3{font:25px/1.04 var(--serif);margin:10px 0 9px;min-height:52px}.course .zh{font-size:11px;color:#7b8476;line-height:1.6;margin:0 0 16px}.course-footer{border-top:1px solid #edf0e7;padding-top:12px;display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--muted)}.course-footer button{border:0;border-radius:50%;width:28px;height:28px;background:#edf2e6;color:var(--green);font-size:17px}.lower{display:grid;grid-template-columns:1.3fr 1fr;gap:23px;margin-top:30px}.panel{border:1px solid var(--line);background:#fff;border-radius:12px;padding:24px}.panel h3{font-size:14px;margin:0 0 18px;font-weight:600}.steps-mini{display:flex;justify-content:space-between;gap:10px}.steps-mini span{font-size:11px;color:var(--muted);text-align:center;line-height:2}.steps-mini b{display:block;margin:auto auto 7px;width:29px;height:29px;background:#f1f4e9;border-radius:50%;font-size:11px;line-height:29px;color:var(--green)}.quote{font:25px/1.3 var(--serif);margin:0 0 10px}.fine{font-size:11px;color:var(--muted);line-height:1.9}.footer{margin-top:33px;font-size:10px;color:#969e90;display:flex;justify-content:space-between}.back{border:0;background:none;padding:0;color:var(--muted);font-size:12px;margin:28px 0 18px}.lesson-head{display:flex;justify-content:space-between;align-items:center;gap:18px;margin-bottom:24px}.lesson-head h1{font:40px/1.1 var(--serif);margin:9px 0}.lesson-head p{font-size:12px;color:var(--muted);line-height:1.8}.level-tag{font-size:11px;background:#e4ead8;padding:5px 9px;border-radius:5px;display:inline-block}.step-tabs{display:flex;border-bottom:1px solid var(--line);gap:26px;margin-bottom:26px;overflow:auto}.step-tabs button{white-space:nowrap;border:0;background:none;padding:15px 0;color:var(--muted);font-size:12px;border-bottom:2px solid transparent}.step-tabs button.active{color:var(--green);border-bottom-color:var(--green);font-weight:700}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 275px;gap:23px}.practice{padding:30px;background:#fff;border:1px solid var(--line);border-radius:12px}.practice h2{font-size:19px;margin:12px 0}.practice p{font-size:13px;line-height:1.9}.aside-stack{display:grid;gap:16px;align-content:start}.aside-stack .panel{padding:21px}.sentence-indicators{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.sentence-indicators button{width:32px;height:32px;border:1px solid var(--line);background:#f7f8f2;border-radius:50%;font-size:11px}.sentence-indicators button.active{background:var(--green);color:white}.sentence-indicators button.done{border-color:#8da86c}.player{background:#f0f4e8;border-radius:10px;padding:20px;display:flex;align-items:center;gap:17px;margin:20px 0}.play{width:49px;height:49px;border-radius:50%;border:0;background:var(--green);color:white;font-size:20px;flex-shrink:0}.player-copy{flex:1;font-size:12px;line-height:1.9}.player select{background:#fff;border:1px solid var(--line);padding:6px;border-radius:5px;font-size:11px;max-width:90px}.input-label{font-size:12px;font-weight:600;display:block;margin:17px 0 10px}textarea{width:100%;min-height:125px;border:1px solid #d9e0d1;border-radius:8px;padding:15px;resize:vertical;line-height:1.8;background:#fff;color:var(--ink);font-size:15px}textarea::placeholder{color:#a0a696;font-size:13px}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:17px}.result{border-radius:8px;background:#f1f5e9;margin-top:20px;padding:17px;font-size:13px;line-height:2}.result .bad{color:#a6503e;text-decoration:line-through;background:#f7e8e1;padding:2px 3px;border-radius:3px}.result .good{color:#446d37}.result .missing{color:#967232;background:#f5efd7;padding:2px 3px;border-radius:3px}.english{font:28px/1.5 var(--serif);color:#2c4336}.translation{color:#74806c;font-size:13px}.note{border-left:3px solid #cbdcaa;background:#f7f9f0;padding:14px 17px;margin:15px 0;font-size:12px;line-height:1.9}.vocab-row{border-bottom:1px solid var(--line);padding:14px 0}.vocab-row:last-child{border:0}.vocab-row b{font-size:14px}.vocab-row p{margin:5px 0;font-size:12px;color:var(--muted)}.vocab-row .btn{float:right}.quiz-option{display:block;text-align:left;width:100%;padding:14px;border:1px solid var(--line);border-radius:8px;margin:10px 0;background:white;line-height:1.6;font-size:13px}.quiz-option.selected{border-color:var(--green);background:#eef3e5}.quiz-option.correct{border-color:#86a661;background:#eef5e4}.record{width:65px;height:65px;border-radius:50%;background:#e8edde;border:0;font-size:26px;margin:10px 0}.record.live{background:#f1d9d1;color:#ac4c3a;animation:pulse 1.2s infinite}@keyframes pulse{50%{box-shadow:0 0 0 9px #f1d9d155}}audio{width:100%;margin-top:12px}.checklist label{display:block;font-size:13px;margin:15px 0;line-height:1.7}.checklist input{accent-color:var(--green);margin-right:9px}.empty{text-align:center;padding:50px 20px}.empty .big{font:60px var(--serif);color:#a4b68c}.review-card{text-align:center;padding:35px 25px}.review-card h2{font:40px var(--serif);margin:20px 0}.review-card .meaning{font-size:19px;margin:20px 0}.review-card .context{font-size:13px;color:var(--muted);line-height:1.9}.progress-bar{height:5px;background:#e7ecdf;border-radius:8px;overflow:hidden;margin:12px 0}.progress-bar i{height:100%;display:block;background:#91aa68}.history-row{display:flex;justify-content:space-between;gap:20px;padding:16px 0;border-bottom:1px solid var(--line);font-size:13px}.notice{font-size:11px;line-height:1.9;color:#8b846f;background:#f3f0e5;padding:13px 16px;border-radius:8px;margin:15px 0}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.settings-grid select{width:100%;border:1px solid var(--line);padding:12px;border-radius:6px;background:#fff;color:var(--ink)}#toast{position:fixed;bottom:27px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;transition:.2s;background:#263e30;color:white;border-radius:8px;padding:12px 22px;font-size:12px;z-index:30;max-width:90vw}#toast.show{opacity:1;transform:translate(-50%,0)}.mobile-brand{display:none}.muted{color:var(--muted)}.summary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:20px 0}.summary-grid div{background:#f2f5eb;border-radius:8px;padding:18px;text-align:center}.summary-grid b{display:block;font-size:25px;margin-bottom:6px}.summary-grid span{font-size:11px;color:var(--muted)}
@media(min-width:1500px){.main{padding-left:65px;padding-right:65px}.hero{padding:40px 45px}.hero h2{font-size:57px}.course-art{height:150px}}
@media(max-width:1150px){.rail{width:195px;padding:28px 18px}.shell{grid-template-columns:195px 1fr}.main{padding:0 28px 30px}.cards{grid-template-columns:repeat(2,1fr)}.course h3{min-height:0}.workspace{grid-template-columns:minmax(0,1fr) 230px}.hero-art .art-label.one{left:0}.hero h2{font-size:43px}}
@media(max-width:800px){.shell{display:block}.rail{position:sticky;top:0;width:100%;height:auto;padding:10px 20px;flex-direction:row;align-items:center;justify-content:space-between;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:14px}.brand small,.rail-note,.rail-bottom{display:none}.brandmark{height:28px;width:28px;font-size:20px}.nav{display:flex;margin:0;gap:2px}.nav button{padding:10px;font-size:11px;gap:4px}.nav .ico{display:none}.main{padding:0 22px 30px}.topbar{height:58px}.heading{padding-top:27px}.heading h1{font-size:26px}.date{display:none}.hero{padding:27px;grid-template-columns:1.3fr 1fr}.hero h2{font-size:38px}.rings{width:150px;height:150px}.art-label{display:none}.sound{gap:3px}.sound i{width:4px;height:20px}.sound i:nth-child(2n){height:37px}.sound i:nth-child(3n){height:55px}.sound i:nth-child(5){height:70px}.hero-art{min-height:150px}.workspace{grid-template-columns:1fr}.aside-stack{grid-template-columns:1fr 1fr}.lower{grid-template-columns:1fr}.stats .stat{padding:16px}.stat-icon{display:none}.section-head{align-items:flex-start}.section-head small{display:block;margin:5px 0 0}.lesson-head h1{font-size:34px}.settings-grid{grid-template-columns:1fr}}
@media(max-width:480px){.brand>span{display:none}.nav button{padding:9px 10px}.main{padding:0 17px 25px}.topbar .pill{display:none}.hero{grid-template-columns:1fr}.hero-art{display:none}.hero h2{font-size:45px}.hero p{font-size:12px}.heading h1{font-size:24px}.cards{gap:11px}.course-body{padding:13px}.course h3{font-size:23px;min-height:49px}.course-art{height:105px}.stats{margin:17px 0 25px}.stat{padding:14px 10px!important}.stat b{font-size:23px}.stat small{font-size:9px}.stat label{font-size:10px}.filters button{padding:7px 9px}.section-head{flex-direction:column}.aside-stack{grid-template-columns:1fr}.practice{padding:21px}.player{padding:14px;gap:11px}.player-copy{font-size:11px}.step-tabs{gap:18px}.lesson-head{align-items:flex-start}.lesson-head h1{font-size:31px}.lesson-head>.pill{display:none}.footer{gap:18px;line-height:1.8}.summary-grid{gap:8px}.summary-grid div{padding:14px 7px}.english{font-size:25px}}
.typing-shell{position:relative;background:#fff;border-radius:8px}.typing-shell textarea,.typing-mirror{font:15px/1.8 'DM Sans',-apple-system,BlinkMacSystemFont,'PingFang TC',sans-serif;letter-spacing:normal;word-spacing:normal;padding:15px;border:1px solid transparent;white-space:pre-wrap;overflow-wrap:break-word;word-break:normal;scrollbar-gutter:stable;tab-size:4}.typing-shell textarea{position:relative;display:block;background:transparent;color:transparent;caret-color:#253b31;border-color:#d9e0d1;z-index:1;min-height:150px}.typing-shell textarea::selection{background:#b9cfa7;color:#253b31}.typing-mirror{position:absolute;inset:0;pointer-events:none;border-radius:8px;overflow:auto;color:var(--ink);z-index:0}.typed-correct{color:#356f42}.typed-wrong{color:#c22d31;background:#fce5e2;text-decoration:underline;text-decoration-color:#d35a52;text-underline-offset:4px}.text-input{width:100%;background:#fff;border:1px solid #d9e0d1;border-radius:8px;padding:13px 15px;color:var(--ink);font-size:15px}.exam-item{padding:22px 0;border-top:1px solid var(--line)}.exam-item h3{font-size:15px}.exam-option{display:flex;align-items:flex-start;gap:10px;border:1px solid var(--line);padding:13px;border-radius:8px;margin:10px 0;line-height:1.7;font-size:13px;cursor:pointer}.exam-option input{accent-color:var(--green);margin-top:4px}.score-report{max-width:850px;margin:20px auto}.score-total{display:flex;align-items:center;gap:17px;margin:20px 0 30px;padding:23px;background:#eaf0dc;border-radius:12px}.score-total b{font-size:60px;font-weight:500;letter-spacing:-3px}.score-total span{font-size:12px;line-height:2;color:#63745c}.score-part{display:grid;grid-template-columns:140px 1fr 80px 65px;gap:15px;align-items:center;border-bottom:1px solid var(--line);padding:15px 0;font-size:12px}.song-modes{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.karaoke-lines{background:#f0f4e7;border-radius:10px;padding:15px;margin:20px 0}.karaoke-lines button{display:block;border:0;background:none;font:26px/1.7 var(--serif);color:#8b9680;text-align:left;padding:5px 9px;width:100%;border-radius:5px}.karaoke-lines button.current,.karaoke-lines button.sung-current{color:#2e5636;background:#dce9c7}.library-tools{display:flex;gap:12px;flex-wrap:wrap;margin:0 0 25px}.library-tools input{flex:1;min-width:150px}.level-overview{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:0 0 25px}.level-overview button{border:1px solid var(--line);border-radius:10px;background:#fff;padding:18px;text-align:left}.level-overview button.active{border-color:#79955b;background:#eaf0df}.level-overview strong{font:29px var(--serif)}.level-overview span{display:block;font-size:11px;color:var(--muted);margin-top:7px}.course .score-badge{font-size:9px;background:#e9f0de;color:#4c6c39;border-radius:4px;padding:3px 5px}.course-desc{font-size:11px;line-height:1.8;color:var(--muted);min-height:39px}.course h3{min-height:54px}.step-tabs{gap:20px}.step-tabs button{padding-bottom:13px}.score-report h3{font-size:16px;margin-top:28px}
@media(max-width:600px){.score-part{grid-template-columns:1fr 65px 60px;gap:9px}.score-part .progress-bar{display:none}.level-overview{gap:7px}.level-overview button{padding:12px}.level-overview strong{font-size:25px}.karaoke-lines button{font-size:23px}.score-total b{font-size:50px}.typing-shell textarea,.typing-mirror{font-size:16px}.text-input{font-size:16px}.step-tabs{gap:18px}}

[hidden]{display:none!important}