:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#253e36;background:#f5f4ef;font-size:16px;--green:#184b40;--muted:#6c7a72;--line:#dce3db}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button{cursor:pointer;border:1px solid var(--line);background:white;color:var(--green);border-radius:10px;padding:11px 16px}button:hover{background:#eaf0e7}button:disabled{opacity:.5;cursor:wait}button.primary{background:var(--green);color:white;border-color:var(--green)}button.danger{color:#9f3831}input,textarea,select{padding:12px;border:1px solid #bccbc2;border-radius:9px;background:white;max-width:100%;color:#253e36}textarea{width:100%;min-height:160px;line-height:1.8}input[type=checkbox]{accent-color:var(--green);width:18px;height:18px}label{display:flex;gap:9px;align-items:center}h1{font-size:32px;letter-spacing:-1px;margin:8px 0}h2{font-size:21px;margin:0 0 16px}h3{margin:10px 0}p{line-height:1.8}.muted,small{color:var(--muted)}small{font-size:13px}.eyebrow{font-size:11px;letter-spacing:2px;color:#78897c;font-weight:700}.shell{display:grid;grid-template-columns:222px 1fr;min-height:100vh}.sidebar{padding:32px 22px;border-right:1px solid var(--line);position:sticky;top:0;height:100vh;background:#f0f1e9}.brand{font-size:22px;font-weight:750;margin-bottom:40px}.brand span{color:#b58b3f}.sidebar nav{display:grid;gap:10px}.sidebar nav button{text-align:left;border:0;background:transparent}.sidebar nav button.active{background:#184b40;color:white}.account{margin-top:40px;border-top:1px solid var(--line);padding-top:20px}.main{max-width:1250px;width:100%;margin:auto;padding:42px 48px;align-self:start}.top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:28px}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.spread{justify-content:space-between}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;margin-bottom:20px}.hero{background:#e8eddf;border:0}.hero h1{font-size:38px}.stat{font-size:36px;display:block;font-weight:700;margin:12px 0}.badge{display:inline-block;border:1px solid var(--line);padding:4px 9px;border-radius:20px;font-size:12px;color:var(--muted)}.list{display:grid;gap:10px}.list-row{display:flex;align-items:center;gap:14px;border-bottom:1px solid #edf0eb;padding:14px 0}.list-row .grow{flex:1;min-width:0}.list-row strong{display:block}.word-title{font-size:50px;letter-spacing:-1px;margin:30px 0 12px;overflow-wrap:anywhere}.study{max-width:780px;margin:auto}.study .card{min-height:320px}.study-controls{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;position:sticky;bottom:12px;padding:12px;background:#f5f4eff2;border-radius:14px}.study-controls button{min-height:54px}.meaning{font-size:23px}.notes{white-space:pre-wrap;line-height:1.9;overflow-wrap:anywhere;font-size:15px}.hidden-meaning{padding:35px 0;color:var(--muted)}.choices{display:grid;gap:12px}.choice{text-align:left}.feedback{background:#edf3e9;padding:15px;border-radius:10px}.login{max-width:430px;margin:10vh auto;padding:30px}.login form{display:grid;gap:18px}.login input{width:100%}.stack{display:grid;gap:12px}dialog{border:0;border-radius:18px;padding:28px;max-width:680px;width:92vw;max-height:85vh;overflow:auto;box-shadow:0 20px 100px #14332944}dialog::backdrop{background:#18382e66}#notice{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:#183e35;color:white;padding:12px 20px;border-radius:10px;display:none;z-index:20;max-width:90vw}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:14px}td,th{padding:12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.progress{height:7px;background:#e7ede4;border-radius:8px;margin:16px 0;overflow:hidden}.progress i{display:block;height:100%;background:#789365}.article{white-space:pre-wrap;line-height:2}.field{display:grid;gap:6px;align-items:stretch}.check-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;max-height:300px;overflow:auto}.alert{background:#fff2d8;border:1px solid #e8d09c;padding:15px;border-radius:12px}.top button{white-space:nowrap}a{color:var(--green)}
@media(max-width:800px){.shell{display:block}.sidebar{position:static;height:auto;padding:16px;border:0}.brand{margin:0}.sidebar nav{position:fixed;bottom:0;left:0;right:0;display:flex;background:#fff;border-top:1px solid var(--line);z-index:5;padding:6px 4px max(8px,env(safe-area-inset-bottom));gap:0;justify-content:space-around}.sidebar nav button{padding:10px 5px;font-size:12px;text-align:center;flex:1;border-radius:6px}.account{display:none}.main{padding:22px 16px 100px}.top{margin-bottom:18px}.grid{grid-template-columns:1fr;gap:0}.card{padding:20px;border-radius:15px}.hero h1{font-size:30px}h1{font-size:27px}.word-title{font-size:40px}.study-controls{bottom:72px;gap:6px;padding:8px 0}.study-controls button{padding:12px 5px}.check-grid{grid-template-columns:1fr}.list-row{flex-wrap:wrap}.list-row .grow{min-width:130px}.top .muted{font-size:12px}.top .row{gap:6px}.login{margin:7vh auto}.meaning{font-size:21px}}

.study-card{position:relative}.study-card>.eyebrow{display:block;padding-right:50px}.undo-arrow{position:absolute;right:18px;top:16px;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;padding:0;background:#f3f6ef;border-color:#e0e7dc}.undo-arrow:hover{background:#e2ebdc}.undo-arrow:focus-visible{outline:3px solid #a2be9a;outline-offset:3px}.daily-setting{border-top:1px solid var(--line);padding-top:18px;margin-top:22px;display:grid;gap:10px}.daily-setting input{width:100px}.daily-setting small{line-height:1.7}

.manager-book{border-top:1px solid var(--line,#e5e7eb);padding:18px 0}.manager-children{margin:8px 0 0 30px;padding-left:18px;border-left:2px solid #dbe7df;font-size:.88rem}.manager-children .row{padding:5px 0}.manager-icon{width:36px;height:36px;padding:4px;font-size:1.2rem}dialog{width:min(960px,94vw);max-height:88vh;overflow:auto}.manager-list h2{margin-bottom:4px}@media(max-width:600px){.manager-book>.row{align-items:flex-start;flex-wrap:wrap}.manager-children{margin-left:12px}}