:root{--ink:#1a302c;--muted:#6f7e78;--green:#194c3f;--lime:#d9ed9e;--line:#dce3dc;--paper:#fff;--wash:#f3f5ef;--orange:#bd4100;--red:#a3312d;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--wash);font-size:15px}*{box-sizing:border-box}body{margin:0}button,a,input,select,textarea{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer;border:1px solid var(--line);background:white;padding:10px 17px;border-radius:8px;color:var(--ink)}button:hover{border-color:var(--green);background:#eef4e8}button:disabled{opacity:.5;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #8db745;outline-offset:3px}a{color:var(--green);text-underline-offset:3px}.primary{background:var(--green);color:white;border-color:var(--green)}.primary:hover{background:#286650;color:white}.quiet{background:transparent;border-color:transparent}.danger{color:var(--red)}.shell{display:grid;grid-template-columns:235px 1fr;min-height:100vh}.sidebar{padding:33px 22px;border-right:1px solid var(--line);background:#fff;position:sticky;top:0;height:100vh;display:flex;flex-direction:column}.brand{font-size:24px;font-weight:750;letter-spacing:-1px}.brand span{display:inline-grid;place-items:center;width:40px;height:40px;background:var(--green);color:var(--lime);border-radius:11px;margin-right:8px}.subbrand{font-size:11px;letter-spacing:2px;margin:12px 0 30px;color:var(--muted)}.nav{display:grid;gap:7px}.nav button{text-align:left;border:0;background:transparent;padding:13px}.nav button.active{background:#eef3e5;color:var(--green);font-weight:650}.sidebar footer{margin-top:auto;color:var(--muted);font-size:12px;line-height:1.8}.content{padding:30px 45px 60px;max-width:1500px;width:100%}.topline{display:flex;justify-content:space-between;align-items:center;color:var(--muted);font-size:13px;margin-bottom:30px}.tag{display:inline-block;padding:5px 9px;background:#eaf0df;border-radius:5px;color:var(--green);font-size:12px}.hero{background:var(--green);border-radius:17px;padding:35px 40px;color:white;position:relative;overflow:hidden;margin-bottom:24px}.hero:after{content:'B1';position:absolute;right:35px;bottom:-32px;font-size:160px;line-height:1;font-weight:800;color:#ffffff0b}.eyebrow{font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--lime);margin-bottom:12px}.hero h1{font-size:34px;letter-spacing:-1px;margin:0 0 14px}.hero p{color:#dbe5d8;line-height:1.8;max-width:610px}.hero button{background:var(--lime);border:0;margin-top:9px}.hero .quiet{background:#ffffff14;color:white;margin-left:8px}.section-title{display:flex;align-items:center;justify-content:space-between;margin:28px 0 15px}.section-title h2{font-size:20px;margin:0}.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}.card{padding:22px;background:white;border:1px solid var(--line);border-radius:12px;min-width:0}.card h3{font-size:19px;margin:11px 0}.card p{font-size:13px;line-height:1.7;color:var(--muted)}.card .big{font-size:30px;letter-spacing:-1px}.card .number{font-family:Georgia,serif;font-size:32px;color:#7d9b76}.card button{width:100%;margin-top:12px}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}.muted{color:var(--muted)}.small{font-size:12px}.panel{background:white;border:1px solid var(--line);border-radius:12px;padding:22px;margin-top:15px}.two{display:grid;grid-template-columns:1.5fr 1fr;gap:18px}.filters{display:flex;gap:9px;flex-wrap:wrap;margin:20px 0}.filters input{flex:1;min-width:180px}input,select,textarea{border:1px solid #bac6bd;border-radius:7px;padding:11px;background:#fff;color:var(--ink)}.list{display:grid;gap:10px}.taskrow{display:flex;align-items:center;gap:16px;background:white;border:1px solid var(--line);border-radius:9px;padding:16px 20px}.taskrow .grow{flex:1}.taskrow h3{margin:2px 0 6px;font-size:16px}.taskrow p{margin:0;font-size:12px;color:var(--muted)}.pill{background:#f0f3e9;padding:5px 8px;border-radius:5px;font-size:12px}.done{background:#dcecd9;color:#2d6234}.wrong{color:var(--red)}.progress{height:6px;background:#e7ede4;border-radius:9px;overflow:hidden;margin:13px 0}.progress i{display:block;height:100%;background:#a3c566}.empty{text-align:center;padding:70px 20px;color:var(--muted)}.loading{padding:50px}.note-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:25px}.note-menu{max-height:76vh;overflow:auto;position:sticky;top:20px}.note-menu button{width:100%;text-align:left;border:0;background:transparent;font-size:13px;padding:12px}.note-menu button.active{background:#e8eedf}.prose{line-height:1.9;overflow-wrap:anywhere;background:white;border:1px solid var(--line);border-radius:12px;padding:30px 38px;min-width:0}.prose h1{font-size:27px}.prose h2{font-size:22px;margin-top:35px}.prose h3{font-size:18px}.prose table{border-collapse:collapse;width:100%;font-size:13px;display:block;overflow:auto;margin:20px 0}.prose td,.prose th{border:1px solid var(--line);padding:9px 12px;min-width:80px}.prose th{background:#edf2e5}.prose img{max-width:100%}.prose blockquote{border-left:3px solid #a3bb8a;margin-left:0;padding-left:16px;color:#4d655b}.prose details{border:1px solid var(--line);padding:12px;margin:15px 0}.flashcard{max-width:760px;margin:25px auto;text-align:center;min-height:320px;display:flex;flex-direction:column;justify-content:center}.flashcard .front{font-size:34px;line-height:1.7;padding:25px}.flashcard .back{text-align:left;line-height:1.8;border-top:1px solid var(--line);padding:25px}.flashcard .back [style]{font-size:inherit!important}.flashcard small{color:var(--muted)}#notice{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;border-radius:9px;padding:12px 20px;z-index:30;display:none;max-width:90vw}.exam{background:#c2cbd1;min-height:100vh;padding:16px}.exam-paper{max-width:1320px;margin:auto;background:white;min-height:calc(100vh - 32px);display:flex;flex-direction:column}.exam-head{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:20px 28px}.exam-head .brand{font-size:22px}.exam-head strong{font-size:25px}.exam-head .exam-label{color:var(--orange)}.module-tabs{display:flex;background:var(--orange);padding-left:24px;gap:1px}.module-tabs button{border:0;border-radius:0;background:transparent;color:white;padding:9px 22px}.module-tabs button.active{background:#fff0de;color:#201f1a;font-weight:700}.exam-tools{padding:16px 28px;border-bottom:1px solid #d7d1cb;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap}.timer{font-size:24px;font-variant-numeric:tabular-nums;letter-spacing:1px}.exam-title{padding:20px 28px 10px}.exam-title h1{font-size:24px;margin:5px 0 12px}.exam-title p{line-height:1.6;margin:0;font-size:14px}.exam-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:26px;padding:15px 28px 30px;flex:1}.passages,.questions{min-width:0;max-height:65vh;overflow:auto;padding-right:12px;scroll-behavior:smooth}.passage{line-height:1.8;border:1px solid #c6ced2;background:#f8fafb;padding:20px;margin-bottom:15px;font-family:Georgia,"Times New Roman",serif;font-size:17px;white-space:pre-line}.passage h3{margin:0 0 15px;font-size:20px}.question{border-bottom:1px solid #d4c9c2;padding:14px 0 20px;scroll-margin-top:15px}.qtitle{font-size:15px;line-height:1.6;margin:0 0 12px}.qnum{background:var(--orange);color:white;border-radius:4px;padding:3px 7px;margin-right:6px;font-size:12px}.choice{display:flex;gap:10px;padding:10px;border:1px solid #d7dbdc;margin:7px 0;cursor:pointer;border-radius:4px;align-items:center;font-size:14px;line-height:1.5}.choice:has(input:checked){background:#fdf0e0;border-color:var(--orange)}.choice input{accent-color:var(--orange)}.answer{background:#f1f6e9;border-left:3px solid #89a456;margin-top:12px;padding:12px;font-size:13px;line-height:1.7}.answer.bad{background:#fff1ed;border-color:var(--red)}.flag{font-size:12px;padding:4px 8px;float:right}.flag.on{background:#fff0c6;border-color:#c48c25}.exam-foot{padding:16px 28px;border-top:1px solid #ccc;display:flex;gap:10px;align-items:center;justify-content:space-between;flex-wrap:wrap}.qnav{display:flex;gap:5px;flex-wrap:wrap}.qnav button{padding:6px 10px;border-radius:3px}.qnav .answered{background:#e2ebd9}.qnav .marked{box-shadow:inset 0 -3px #d9a326}.exam textarea{width:100%;min-height:340px;line-height:1.8;resize:vertical}.listen-box{padding:22px;background:#f1f4f6;border:1px solid #c6ced2}.listen-box .primary{background:var(--orange);border:0}.listen-box p{font-size:13px;line-height:1.7}.speech-points{line-height:2}.result-banner{border:1px solid #9aaa7f;background:#f0f6e6;padding:16px;margin-bottom:15px}.recording{color:var(--red);font-weight:700}.resource{padding:16px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;align-items:center}.resource a{font-size:14px}.resource:last-child{border:0}dialog{border:1px solid var(--line);border-radius:14px;max-width:510px;padding:28px;line-height:1.7}dialog::backdrop{background:#15231f88}.mobile-brand{display:none}.exportbar{display:flex;gap:8px;flex-wrap:wrap}audio{max-width:100%}
@media(min-width:1600px){.content{padding:40px 65px}.hero{padding:45px}}
@media(max-width:1100px){.grid{grid-template-columns:repeat(2,1fr)}.content{padding:25px}.sidebar{padding:25px 13px}.shell{grid-template-columns:200px 1fr}.two{grid-template-columns:1fr}.note-layout{grid-template-columns:200px 1fr}.prose{padding:22px}.exam-head{padding:16px}.exam-body{padding:16px;gap:15px}}
@media(max-width:720px){.shell{display:block}.sidebar{height:auto;position:static;padding:15px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:20px}.subbrand,.sidebar footer{display:none}.nav{display:flex;overflow-x:auto;gap:3px;margin-top:12px}.nav button{white-space:nowrap;padding:9px;font-size:12px}.content{padding:18px}.topline{margin-bottom:18px;font-size:11px}.hero{padding:25px}.hero h1{font-size:28px}.hero:after{font-size:120px;right:15px}.hero p{font-size:13px}.card{padding:16px}.taskrow{padding:13px;gap:9px}.taskrow button{padding:9px}.taskrow .pill{display:none}.note-layout{display:block}.note-menu{position:static;max-height:180px;margin-bottom:15px}.prose{padding:18px;font-size:14px}.exam{padding:0}.exam-paper{min-height:100vh}.exam-head .brand{font-size:16px}.exam-head strong{font-size:20px}.module-tabs{padding:0}.module-tabs button{flex:1;padding:10px 8px;font-size:13px}.exam-body{display:block}.passages,.questions{max-height:none;overflow:visible;padding:0}.exam-tools{padding:12px 16px}.exam-title{padding:16px}.exam-head{padding:16px}.timer{font-size:21px}.exam-foot{position:sticky;bottom:0;background:white;padding:12px;border-top:2px solid #ddd;z-index:5}.passage{font-size:16px}.flashcard .front{font-size:27px}.resource{align-items:flex-start}.exportbar button{font-size:12px}}
