@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&family=Lora:ital,wght@0,400;0,500;0,600;1,400;1,500&display=swap');
:root{--bg:#f7f7f2;--paper:#fff;--ink:#263e36;--muted:#7e8880;--line:#e4e7de;--accent:#d8653e;--soft:#f7ece5;--green:#426251}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px 'Be Vietnam Pro',sans-serif}button,input,textarea,select{font:inherit}button,a,select{touch-action:manipulation}button{cursor:pointer}button{color:inherit}button:focus-visible,a:focus-visible{outline:3px solid #e7a082;outline-offset:4px}aside{width:250px;background:#eef0e7;position:fixed;inset:0 auto 0 0;padding:35px 23px;display:flex;flex-direction:column;border-right:1px solid var(--line)}.logo{font-size:38px;font-weight:700;text-decoration:none;color:var(--ink);letter-spacing:-2px;display:flex;align-items:center;gap:10px}.logo>span:first-child{background:var(--green);color:white;border-radius:11px;font:italic 36px Lora,serif;width:40px;height:43px;text-align:center}.logo .logo-dot{color:var(--accent);margin-left:-12px}.side-label{font-size:8px;letter-spacing:1.2px;margin:23px 0 35px;line-height:1.9;color:#7b8679}nav{display:grid;gap:9px}nav button{display:flex;align-items:center;gap:12px;border:0;background:none;padding:14px 12px;border-radius:7px;text-align:left;font-size:18px}nav button span{font-size:12px;font-weight:500}nav small{font-size:9px;margin-left:auto;color:#899183}nav .active{background:#fff;color:var(--green);box-shadow:0 2px 4px #233c2d06}.side-bottom{margin-top:auto;background:#e5e9dc;padding:19px 16px;border-radius:9px}.book-icon{font-size:29px;color:#69806a;margin-bottom:12px}.side-bottom strong{font:500 18px Lora,serif;line-height:1.5}.side-bottom p{font-size:11px;line-height:1.9;color:#7c8578}.side-bottom button{font-size:10px;background:none;border:0;padding:6px 0;color:var(--green)}.local-note{font-size:9px;margin-top:22px;color:#899181;display:flex;align-items:center;gap:6px}.local-note i{width:5px;height:5px;border-radius:100%;background:#6d8871}main{margin-left:250px;padding:0 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30px}.exercise-top{display:flex;justify-content:space-between;align-items:center}.badge{background:#edf2e9;color:#68805b;padding:6px 10px;border-radius:4px;font-size:9px}.save{border:0;background:none;color:#83907d;font-size:11px}.prompt-label{font-size:9px;color:var(--muted);letter-spacing:1.5px;margin-top:28px}.sentence{font:400 27px/1.6 Lora,serif;margin:12px 0 17px;min-height:83px}.source-ref{font-size:9px;color:#a0a697;display:flex;gap:8px;align-items:center}.rule{height:1px;background:var(--line);margin:24px 0}.input-label{display:flex;justify-content:space-between;font-size:10px;margin-bottom:12px}.input-label small{color:#9bA293;font-size:9px}textarea{width:100%;height:120px;resize:vertical;border:1px solid #e0e5d9;border-radius:7px;padding:15px;color:var(--ink);background:#fdfefa;line-height:1.8;font-size:13px;outline:0}textarea:focus{border-color:#739179;box-shadow:0 0 0 3px #eaf0e6}textarea::placeholder{color:#afb5a8}.actions{display:flex;gap:12px;justify-content:space-between;margin-top:17px;align-items:center}.btn{padding:12px 17px;border:1px solid var(--line);border-radius:6px;background:white;font-size:11px;font-weight:500}.primary{background:var(--accent);color:white;border-color:var(--accent)}.btn:hover{filter:brightness(.97)}.hint{font-size:11px;background:none;border:0;color:#8d957f}.feedback{background:#f3f6ef;border-radius:7px;padding:17px;margin-top:19px;font-size:12px;line-height:1.8}.feedback strong{display:block;font-size:10px;color:var(--green);margin-bottom:6px}.feedback .answer{font:19px/1.6 Lora,serif;margin:8px 0}.feedback .assessment{font-size:10px;color:#7a8675}.rate{display:flex;gap:9px;margin-top:12px}.card-bottom{background:#fbfcf8;padding:16px 29px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:10px;color:#8d9685}.card-bottom button{background:none;border:0;font-size:11px}.rail{display:grid;gap:18px;align-content:start}.rail-card{background:#fff;border:1px solid var(--line);border-radius:11px;padding:22px}.rail-card h3{font-size:12px;margin:0 0 18px;font-weight:600}.rail-card label{font-size:9px;color:var(--muted);display:block;margin:15px 0 9px}select,input[type=search]{width:100%;border:1px solid var(--line);border-radius:6px;padding:11px 9px;background:#fafbf6;color:var(--ink);font-size:11px}.lesson-title{font:22px/1.5 Lora,serif;margin:18px 0 8px}.rail-card p{font-size:11px;color:var(--muted);line-height:1.9}.formula{background:#f2f4eb;padding:13px;border-left:2px solid #92a280;font-size:12px;line-height:1.7;margin-top:15px}.progress-row{display:flex;justify-content:space-between;font-size:10px;margin:15px 0 9px}.track{height:5px;border-radius:8px;background:#ecefe5;overflow:hidden}.track i{display:block;height:100%;background:#78906a;transition:width .3s}.tip{background:#f0eee3;border:0}.tip 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