:root{--green:#58cc02;--green-dark:#43a802;--green-shadow:#4aa002;--green-light:#d7ffb8;--red:#ff4b4b;--red-light:#ffdfe0;--blue:#1cb0f6;--yellow:#ffc800;--text:#3c3c3c;--text-sub:#777;--bg:#fff;--border:#e5e5e5;--radius:16px;font-family:PingFang SC,Hiragino Sans GB,Microsoft YaHei,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);min-height:100vh}#root{max-width:860px;margin:0 auto;padding:16px}h1{font-size:1.8rem;font-weight:800}h2{color:var(--text-sub);margin-bottom:12px;font-size:1.1rem;font-weight:700}.page{flex-direction:column;gap:24px;padding:12px 0 40px;display:flex}.error{color:var(--red);font-weight:700}button{cursor:pointer;background:0 0;border:none;font-family:inherit}.btn-primary,.btn-secondary{border-radius:var(--radius);letter-spacing:.05em;padding:14px 32px;font-size:1.05rem;font-weight:800;transition:transform 60ms,filter .15s}.btn-primary{background:var(--green);color:#fff;box-shadow:0 4px 0 var(--green-shadow)}.btn-primary:not(:disabled):hover{filter:brightness(1.06)}.btn-primary:not(:disabled):active{box-shadow:none;transform:translateY(4px)}.btn-primary:disabled{color:#afafaf;cursor:not-allowed;background:#e5e5e5;box-shadow:0 4px #d0d0d0}.btn-secondary{color:var(--blue);border:2px solid var(--border);box-shadow:0 4px 0 var(--border);background:#fff}.btn-secondary:not(:disabled):active{box-shadow:none;transform:translateY(4px)}.btn-secondary:disabled{color:#ccc;cursor:not-allowed}.btn-row{justify-content:center;gap:16px;display:flex}.btn-icon{color:#b0b0b0;border-radius:10px;padding:6px 10px;font-size:1.3rem}.btn-icon:hover{background:#f0f0f0}.select-hero{align-items:center;gap:20px;padding:12px 0;display:flex}.select-hero p{color:var(--text-sub);margin-top:6px;font-size:1.05rem}.card-row{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;display:grid}.card{border:2px solid var(--border);border-radius:var(--radius);box-shadow:0 4px 0 var(--border);background:#fff;flex-direction:column;align-items:center;gap:6px;padding:22px 16px;transition:transform 60ms,border-color .15s,background .15s;display:flex}.card:hover{background:#f7fdf2}.card:active{box-shadow:none;transform:translateY(4px)}.card.selected{border-color:var(--green);background:var(--green-light);box-shadow:0 4px 0 var(--green-shadow)}.card-emoji{font-size:2.2rem}.card-title{color:var(--text);font-size:1.15rem;font-weight:800}.card-sub{color:var(--text-sub);font-size:.85rem}.btn-start{align-self:center;min-width:260px;font-size:1.2rem}.practice-header{align-items:center;gap:14px;display:flex}.progress-track{background:var(--border);border-radius:8px;flex:1;height:16px;overflow:hidden}.progress-fill{background:var(--green);border-radius:8px;height:100%;transition:width .4s}.progress-text{color:var(--text-sub);font-weight:800}.practice-main{align-items:flex-start;gap:24px;display:flex}.mascot-side{flex:none;padding-top:20px}.question-side{flex-direction:column;flex:1;gap:18px;min-width:0;display:flex}.task-label{color:var(--text-sub);font-weight:700}.speak-row{align-items:center;gap:16px;display:flex}.btn-speak{background:var(--blue);border-radius:18px;flex-shrink:0;width:64px;height:64px;font-size:1.8rem;transition:transform 60ms;box-shadow:0 4px #1899d6}.btn-speak:active{box-shadow:none;transform:translateY(4px)}.btn-speak.speaking{animation:.8s infinite pulse}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.08)}}.hint{color:var(--text);border:2px solid var(--border);background:#f7f7f7;border-radius:12px;padding:12px 16px;font-size:1.05rem}.answer-input{border:2px solid var(--border);border-radius:var(--radius);width:100%;color:var(--text);background:#f7f7f7;outline:none;padding:16px 18px;font-family:inherit;font-size:1.2rem}.answer-input:focus{border-color:var(--blue);background:#fff}.input-wrong{border-color:var(--red);background:var(--red-light);animation:.35s shake}.input-correct{border-color:var(--green);background:var(--green-light)}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-8px)}75%{transform:translate(8px)}}.feedback{border-radius:var(--radius);padding:16px 20px;font-weight:700;animation:.25s slide-up}@keyframes slide-up{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.feedback-correct{background:var(--green-light);color:var(--green-dark)}.feedback-wrong{background:var(--red-light);color:var(--red)}.feedback-reveal{color:#b8860b;background:#fff4d6}.answer-show{margin-top:6px;font-size:1.3rem}.diff{letter-spacing:.03em;margin-top:8px;font-size:1.25rem}.diff .ok{color:var(--green-dark)}.diff .bad{color:var(--red);font-weight:900;-webkit-text-decoration:underline wavy;text-decoration:underline wavy}.practice-footer{color:var(--text-sub);border-top:2px solid var(--border);justify-content:center;gap:28px;padding-top:14px;font-size:.9rem;display:flex}.practice-footer label{align-items:center;gap:8px;display:flex}.practice-footer input[type=range]{accent-color:var(--green)}.practice-footer input[type=checkbox]{accent-color:var(--green);width:18px;height:18px}.summary{text-align:center;align-items:center}.score{color:var(--text-sub);font-size:1.2rem;font-weight:700}.wrong-list{text-align:left;width:100%;max-width:560px}.wrong-list ul{flex-direction:column;gap:8px;list-style:none;display:flex}.wrong-list li{border:2px solid var(--red-light);background:#fff7f7;border-radius:12px;flex-direction:column;padding:10px 14px;display:flex}.wrong-list li span{color:var(--text-sub);font-size:.9rem}.loading{color:var(--text-sub);align-items:center;padding-top:60px;font-weight:700}.mascot{display:inline-block}.mascot svg{overflow:visible}.mascot .eyelids,.mascot .brows{opacity:0}.mascot-idle svg{animation:3s ease-in-out infinite float}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-8px)}}.mascot-idle .pupils{animation:4s infinite blink-pupil}.mascot-idle .eyelids{animation:4s infinite blink-lid}@keyframes blink-pupil{0%,91%,95%,to{opacity:1}92%,94%{opacity:0}}@keyframes blink-lid{0%,91%,95%,to{opacity:0}92%,94%{opacity:1}}.mascot-happy svg{animation:.5s infinite bounce}@keyframes bounce{0%,to{transform:translateY(0)scale(1)}30%{transform:translateY(2px)scale(1.04,.94)}60%{transform:translateY(-14px)scale(.98,1.04)}}.mascot-happy .wing-left{transform-origin:50px 100px;animation:.3s ease-in-out infinite flap-left}.mascot-happy .wing-right{transform-origin:150px 100px;animation:.3s ease-in-out infinite flap-right}@keyframes flap-left{0%,to{transform:rotate(0)}50%{transform:rotate(40deg)}}@keyframes flap-right{0%,to{transform:rotate(0)}50%{transform:rotate(-40deg)}}.mascot-sad svg{animation:.4s forwards droop}@keyframes droop{to{transform:translateY(6px)rotate(-3deg)}}.mascot-sad .brows{opacity:1}.mascot-sad .pupils{transform:translateY(5px)}.mascot-speaking svg{animation:.7s ease-in-out infinite sway}@keyframes sway{0%,to{transform:rotate(-2deg)}50%{transform:rotate(2deg)}}.mascot-speaking .beak-bottom{transform-origin:100px 118px;animation:.35s ease-in-out infinite talk}@keyframes talk{0%,to{transform:translateY(0)}50%{transform:translateY(5px)}}.auth-page{align-items:center;padding-top:40px}.auth-hero{text-align:center;flex-direction:column;align-items:center;gap:8px;display:flex}.auth-hero p{color:var(--text-sub)}.auth-card{border:2px solid var(--border);border-radius:var(--radius);width:100%;max-width:400px;box-shadow:0 4px 0 var(--border);flex-direction:column;gap:14px;padding:24px;display:flex}.auth-tabs{background:#f2f2f2;border-radius:12px;gap:8px;padding:4px;display:flex}.auth-tabs button{color:var(--text-sub);border-radius:9px;flex:1;padding:10px;font-size:1rem;font-weight:800}.auth-tabs button.active{color:var(--green-dark);background:#fff;box-shadow:0 2px 6px #00000014}.auth-input{border:2px solid var(--border);background:#f7f7f7;border-radius:12px;outline:none;padding:14px 16px;font-family:inherit;font-size:1.05rem}.auth-input:focus{border-color:var(--blue);background:#fff}.user-bar{justify-content:space-between;align-items:center;display:flex}.user-name{color:var(--text);font-weight:800}.user-actions{gap:8px;display:flex}.btn-link{color:var(--blue);border-radius:10px;padding:8px 12px;font-size:.95rem;font-weight:700}.btn-link:hover{background:#eaf7fe}.progress-page h1{font-size:1.4rem}.loading-text{color:var(--text-sub);font-weight:700}.empty-state{color:var(--text-sub);flex-direction:column;align-items:center;gap:10px;padding:20px;font-weight:700;display:flex}.stat-grid{grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px;display:grid}.stat-card{border:2px solid var(--border);border-radius:var(--radius);box-shadow:0 4px 0 var(--border);flex-direction:column;gap:8px;padding:16px 18px;display:flex}.stat-title{color:var(--text-sub);font-size:.9rem;font-weight:700}.stat-num{color:var(--green-dark);font-size:1.8rem;font-weight:900}.stat-num small{color:var(--text-sub);font-size:1rem;font-weight:700}.stat-bar{background:var(--border);border-radius:5px;height:10px;overflow:hidden}.stat-bar-fill{background:var(--green);border-radius:5px;height:100%}.stat-sub{color:var(--text-sub);font-size:.85rem}.group-chips{flex-wrap:wrap;gap:8px;margin-bottom:14px;display:flex}.chip{border:2px solid var(--border);color:var(--text-sub);background:#fff;border-radius:999px;padding:8px 16px;font-size:.9rem;font-weight:700;transition:all .15s}.chip:hover{border-color:var(--green)}.chip.active{border-color:var(--green);background:var(--green-light);color:var(--green-dark)}.pager{justify-content:center;align-items:center;gap:16px;margin-top:16px;display:flex}.pager-btn{border:2px solid var(--border);color:var(--blue);box-shadow:0 3px 0 var(--border);background:#fff;border-radius:12px;padding:10px 18px;font-weight:700;transition:transform 60ms}.pager-btn:not(:disabled):active{box-shadow:none;transform:translateY(3px)}.pager-btn:disabled{color:#ccc;cursor:not-allowed}.pager-info{color:var(--text-sub);font-weight:700}.wrong-history.dim{opacity:.5}.wrong-history{flex-direction:column;gap:10px;list-style:none;display:flex}.wrong-history li{border:2px solid var(--border);border-radius:12px;flex-direction:column;gap:6px;padding:12px 16px;display:flex}.wrong-main{flex-direction:column;gap:2px;display:flex}.wrong-main strong{font-size:1.05rem}.wrong-trans{color:var(--text-sub);font-size:.9rem}.wrong-meta{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.tag{color:var(--text-sub);background:#f0f0f0;border-radius:8px;padding:2px 8px;font-size:.78rem;font-weight:700}.tag-red{background:var(--red-light);color:var(--red)}.wrong-time{color:#b0b0b0;margin-left:auto;font-size:.78rem}.btn-detail{border:2px solid var(--border);color:var(--text-sub);box-shadow:0 3px 0 var(--border);background:#fff;border-radius:14px;flex-shrink:0;padding:10px 16px;font-weight:700;transition:transform 60ms}.btn-detail:active{box-shadow:none;transform:translateY(3px)}.btn-detail.on{border-color:var(--yellow);color:#b8860b;background:#fff9e6;box-shadow:0 3px #e6b400}.detail-panel{border-radius:var(--radius);background:#fffbef;border:2px solid #ffe9a8;flex-direction:column;gap:6px;padding:14px 18px;animation:.25s slide-up;display:flex}.detail-phonetic{color:var(--blue);font-weight:700}.detail-trans{flex-direction:column;gap:2px;font-weight:700;list-style:none;display:flex}.detail-sentence{color:var(--text);border-top:1px dashed #e6d9a8;padding-top:8px}.detail-sentence-cn{color:var(--text-sub);font-size:.9rem}.word-blanks{border:2px solid var(--border);border-radius:var(--radius);background:#f7f7f7;flex-wrap:wrap;align-items:baseline;gap:8px 6px;padding:18px 16px;line-height:2;display:flex}.blanks-correct .word-blanks{border-color:var(--green);background:var(--green-light)}.blanks-wrong .word-blanks{border-color:var(--red);background:#fff5f5;animation:.35s shake}.blank-input{text-align:center;color:var(--text);background:0 0;border:none;border-bottom:3px solid #b8b8b8;border-radius:0;outline:none;padding:2px 1px;font-family:inherit;font-size:1.15rem}.blank-input:focus{border-bottom-color:var(--blue)}.blank-input.bad{border-bottom-color:var(--red);color:var(--red)}.blank-input.ok{border-bottom-color:var(--green);color:var(--green-dark)}.blank-input:disabled{color:var(--text);-webkit-text-fill-color:var(--text);opacity:1}.blanks-correct .blank-input{color:var(--green-dark);-webkit-text-fill-color:var(--green-dark);border-bottom-color:var(--green)}.blank-punct{color:var(--text-sub);font-size:1.2rem;font-weight:700}@media (width<=640px){.practice-main{flex-direction:column;align-items:center}.mascot-side{padding-top:0}.select-hero{text-align:center;flex-direction:column}.btn-row{flex-direction:column}}