:root{font-family:Inter,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:#26334b;background:#f6f8fc;font-synthesis:none;font-weight:400;line-height:1.6;--blue:#2457da;--navy:#162e58;--muted:#718096;--border:#e2e8f1;--mint:#177967;--shadow:0 12px 40px #20366408}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;background:none;color:inherit}button:disabled{cursor:not-allowed;opacity:.48}button,a{touch-action:manipulation}a{color:var(--blue);text-decoration:none}button:focus-visible,a:focus-visible{outline:3px solid #83a8ff;outline-offset:4px}input:focus,textarea:focus,select:focus{outline:2px solid #8aabfa;outline-offset:1px}h1,h2,h3,p{margin:0}h1,h2,h3{color:#1c2c46}h1{font-size:clamp(26px,2.5vw,34px);letter-spacing:-.035em;line-height:1.4;font-weight:730}h2{font-size:19px;font-weight:680}h3{font-size:18px;font-weight:650}svg{flex-shrink:0}textarea{resize:vertical}::selection{background:#d4e2ff}label{display:grid;gap:8px;font-size:15px;font-weight:550}input,select,textarea{color:#273750}input,select{width:100%;background:#fff;border:1px solid #d8e0ec;border-radius:11px;padding:12px 14px;min-height:47px}textarea{width:100%;border:1px solid var(--border);background:#fff;border-radius:12px;min-height:120px;padding:14px;line-height:1.8}input::placeholder,textarea::placeholder{color:#8a96aa;font-weight:400}button{transition:background .15s,box-shadow .15s,transform .15s}button:not(:disabled):active{transform:translateY(1px)}.app{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:236px;background:#fff;border-right:1px solid var(--border);padding:31px 22px 20px;display:flex;flex-direction:column;z-index:30}.brand{display:flex;gap:11px;align-items:center}.brand-mark{display:grid;place-items:center;width:41px;height:41px;border-radius:12px;background:var(--blue);color:#fff;box-shadow:0 6px 12px #2457da20}.brand strong{font-size:23px;letter-spacing:2px;color:#1c3359;line-height:1.1;display:block}.brand strong span{display:block;font-size:9px;letter-spacing:2.2px;font-weight:600;color:#7387a6;margin-top:7px}.profile-pill{margin:35px 0 26px;background:#f6f8fb;border:1px solid #ecf0f6;border-radius:12px;padding:12px 10px;display:flex;align-items:center;gap:10px}.avatar{width:35px;height:35px;display:grid;place-items:center;background:#e2ebff;color:var(--blue);border-radius:11px;font-weight:650}.profile-pill strong{font-size:14px;display:block}.profile-pill div>span{display:block;font-size:12px;color:var(--muted);margin-top:2px}.sidebar nav{display:grid;gap:7px}.sidebar nav button{min-height:49px;border-radius:10px;display:flex;align-items:center;gap:13px;text-align:left;padding:0 14px;font-size:15px;font-weight:550;color:#64728a}.sidebar nav button svg{width:20px;height:20px}.sidebar nav button:hover{background:#f5f7fb}.sidebar nav button.active{background:#edf3ff;color:var(--blue)}.count{margin-left:auto;background:#dae5ff;border-radius:5px;font-size:12px;padding:0 6px}.sidebar-history{margin-top:36px}.eyebrow{font-size:12px;font-weight:650;letter-spacing:1.2px;color:#8592a7}.eyebrow.blue{color:var(--blue);font-size:13px;letter-spacing:1.5px}.sidebar-history .eyebrow{padding-left:12px}.sidebar-history p{font-size:12px;color:#93a0b2;padding:14px 12px}.sidebar-history button{display:flex;align-items:center;gap:9px;text-align:left;width:100%;font-size:13px;margin-top:9px;padding:9px 12px;border-radius:8px;color:#748299}.sidebar-history button span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.sidebar-history button:hover,.sidebar-history button.selected{background:#f3f6fb;color:var(--blue)}.sidebar-footer{margin-top:auto;padding-top:22px}.gentle-note{display:flex;align-items:flex-start;gap:11px;padding:17px 12px;color:#80958c}.gentle-note svg{margin-top:4px;color:#359582}.gentle-note p{font-size:13px;color:#7b889d;line-height:1.85}.footer-link{display:flex;gap:9px;align-items:center;border-top:1px solid #edf0f6;width:100%;padding:17px 10px 0;font-size:14px;color:#758298}.footer-link svg:last-child{margin-left:auto}.footer-link.selected{color:var(--blue)}.main-shell{margin-left:236px}.topbar{height:79px;border-bottom:1px solid #e7ecf4;display:flex;align-items:center;justify-content:space-between;padding:0 42px;background:#fffa;gap:12px}.topbar-title{font-size:13px;color:#7b899d}.topbar-right{display:flex;align-items:center;gap:20px}.grade-tag{font-size:12px;padding:5px 11px;border:1px solid #e1e7f0;border-radius:6px;color:#697a94;background:#fff}.round-avatar{display:grid;place-items:center;width:32px;height:32px;background:#e8effc;color:#526f9d;font-size:13px;font-weight:600;border:3px solid white;border-radius:50%}.content{max-width:1260px;margin:0 auto;padding:39px 42px 34px;min-height:calc(100vh - 140px)}.page-heading{margin-bottom:29px}.page-heading h1{margin:10px 0 11px}.page-heading h1>span{color:var(--blue)}.page-heading>p{font-size:15px;color:#79879c;line-height:1.7}.home-grid{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:25px}.home-main{min-width:0}.question-card{background:#fff;border:1px solid #dbe5f5;border-radius:17px;padding:22px 23px 15px;box-shadow:var(--shadow);position:relative}.card-caption{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:13px}.card-caption>span:first-child{display:flex;align-items:center;gap:8px;font-weight:650;color:#3a517a}.card-caption svg{color:var(--blue)}.card-caption .muted{font-size:12px;color:#91a0b4}.subject-tabs{display:flex;gap:7px;margin:21px 0 8px}.subject-tabs button{padding:7px 13px;display:flex;gap:6px;align-items:center;font-size:13px;border-radius:8px;color:#8a96a7;min-height:36px}.subject-tabs button.selected{background:#eaf0ff;color:var(--blue);font-weight:650}.subject-tabs button:hover{background:#f3f6fc}.question-card textarea{height:123px;min-height:110px;border:none;padding:13px 1px;font-size:16px;background:transparent;resize:none;line-height:1.9}.question-card textarea:focus{outline:0}.question-card:focus-within{border-color:#9bb5ef;box-shadow:0 0 0 3px #2457da08}.composer-footer{display:flex;align-items:center;justify-content:space-between;gap:10px}.photo-button{display:flex;align-items:center;gap:7px;font-size:13px;color:#7c8ba3;padding:8px 0;min-height:42px}.photo-button:hover{color:var(--blue)}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:10px 17px;border-radius:10px;font-size:14px;font-weight:600;line-height:1.5}.primary{background:var(--blue);color:#fff;box-shadow:0 4px 10px #2457da10;border:1px solid transparent}.primary:hover:not(:disabled){background:#1948c5;box-shadow:0 5px 14px #2457da25}.secondary{background:#fff;border:1px solid #dce3ee;color:#5e7190}.secondary:hover:not(:disabled){background:#f2f6ff;border-color:#b8caed}.input-note{font-size:11px;color:#9ba6b8;margin-top:16px;padding-top:11px;border-top:1px solid #eff2f7}.section-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:18px}.section-title h2{font-size:17px;display:flex;align-items:center;gap:9px}.text-button{display:inline-flex;align-items:center;gap:5px;color:var(--blue);font-size:13px;padding:7px 0;min-height:34px}.text-button:hover:not(:disabled){color:#123b98}.practice-section{margin-top:29px}.exercise-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.exercise-card{text-align:left;background:#eff4ff;border:1px solid #e1e9f9;border-radius:14px;padding:18px 16px 16px;min-height:182px;display:flex;flex-direction:column;align-items:flex-start;position:relative;overflow:hidden}.exercise-card:hover{transform:translateY(-3px);box-shadow:0 8px 20px #314e7d0c}.exercise-symbol{height:38px;width:38px;border-radius:10px;background:#fff9;display:grid;place-items:center;color:#4b76d4;margin-bottom:13px}.exercise-card .small-tag{padding:0;background:none;font-size:11px;color:#7f93b8;font-weight:500}.exercise-card h3{font-size:16px;margin:5px 0 17px}.exercise-card>div{display:flex;align-items:center;justify-content:space-between;gap:7px;width:100%;margin-top:auto;font-size:11px;color:#8b9bb3}.exercise-card>div svg{color:#6b8bbe;width:16px}.tone-1{background:#eef8f5;border-color:#e0eee9}.tone-1 .exercise-symbol{color:#38967e}.tone-1 .small-tag,.tone-1>div{color:#7c9b90}.tone-1>div svg{color:#6da08d}.tone-2{background:#fff7e9;border-color:#f2e9d8}.tone-2 .exercise-symbol{color:#b3893b}.tone-2 .small-tag,.tone-2>div{color:#a99a7f}.tone-2>div svg{color:#b49b6a}.learning-tip{margin-top:24px;display:flex;align-items:center;gap:14px;padding:18px;border:1px dashed #d4deed;border-radius:13px}.tip-icon{display:grid;place-items:center;width:40px;height:40px;background:#edf2fd;border-radius:50%;color:#7692c7;flex-shrink:0}.learning-tip strong{font-size:13px;font-weight:600;color:#536985}.learning-tip p{font-size:12px;color:#8b97aa;margin-top:4px}.home-aside{display:flex;flex-direction:column;gap:20px}.progress-card{background:#1d3964;border-radius:16px;padding:24px 22px;color:#fff;box-shadow:0 8px 20px #172d4a0b}.progress-card .section-title{color:#89a6cb;margin-bottom:19px}.progress-card h2{color:#edf3fc;font-size:15px}.progress-number{font-size:46px;font-weight:660;letter-spacing:-1px;line-height:1.2;display:flex;flex-direction:column;gap:6px}.progress-number>span{font-size:12px;color:#a4b9d7;font-weight:400;letter-spacing:0}.progress-details{display:flex;margin-top:25px;padding-top:19px;border-top:1px solid #ffffff19;gap:34px}.progress-details>div{display:flex;flex-direction:column}.progress-details b{font-size:21px;font-weight:550}.progress-details span{font-size:11px;color:#9eb6d6;margin-top:3px}.progress-card>p{font-size:11px;margin-top:22px;color:#a7bdd7}.steps-card{border:1px solid #e4eaf3;border-radius:15px;padding:22px 18px;background:#fff}.steps-card .eyebrow{margin-bottom:17px;font-size:12px;color:#637695}.study-step{display:flex;gap:13px;margin-top:20px}.study-step>span{font-size:11px;color:#7994bb;background:#f0f4fb;border:1px solid #e9eff7;border-radius:7px;display:grid;place-items:center;width:28px;height:28px;flex-shrink:0;font-weight:600}.study-step strong{font-size:13px;color:#506584;font-weight:600}.study-step p{font-size:11px;color:#96a0b1;margin-top:4px}.parent-disclosure{display:flex;align-items:flex-start;gap:8px;font-size:11px;line-height:1.8;color:#96a3b4;padding:0 5px}.parent-disclosure svg{margin-top:3px;color:#a3afc0}.page-footer{max-width:1260px;margin:0 auto;padding:12px 42px 23px;font-size:11px;color:#a5afbe;display:flex;justify-content:space-between}.bottom-nav,.mobile-menu,.mobile-close{display:none}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:42px;height:42px;border-radius:9px;flex-shrink:0}.icon-button:hover{background:#eaf0fc}.muted{color:var(--muted)}.small-tag{display:inline-flex;background:#eef3ff;color:#5b7ec6;font-size:12px;padding:4px 9px;border-radius:6px;font-weight:550}.filter-tabs{display:flex;gap:10px;margin-bottom:23px}.filter-tabs button{display:flex;align-items:center;gap:8px;border:1px solid #e0e7f1;border-radius:10px;padding:9px 21px;min-height:45px;background:#fff;font-size:14px;color:#7a8aa2}.filter-tabs .selected{background:#edf3ff;color:var(--blue);border-color:#c7d7f7}.practice-list{display:grid;gap:15px;max-width:830px}.practice-row{display:flex;align-items:center;gap:20px;text-align:left;padding:22px;background:#fff;border:1px solid var(--border);border-radius:15px}.practice-row:hover{border-color:#aec4ef;box-shadow:var(--shadow)}.practice-row>div{flex:1;min-width:0}.practice-row>svg{color:#90a4c1}.subject-icon{width:54px;height:54px;display:grid;place-items:center;background:#eff3fd;border-radius:14px;color:#5a81cb;flex-shrink:0}.subject-icon.mint{background:#e9f6f0;color:#418b75}.row-kicker{font-size:12px;color:#8b9ab1;margin-bottom:4px}.practice-row h3{font-size:17px}.practice-row p{font-size:14px;color:#8592a6;margin-top:5px}.footnote{font-size:12px;color:#8998ae;line-height:1.85;margin-top:18px}.empty-state{background:#fff;border:1px solid var(--border);border-radius:17px;padding:65px 30px;display:flex;align-items:center;flex-direction:column;text-align:center}.empty-state>div{display:grid;place-items:center;width:76px;height:76px;border-radius:23px;background:#eff4ff;color:#7094d9;margin-bottom:24px}.empty-state h2{font-size:21px}.empty-state p{font-size:15px;color:#8592a7;max-width:380px;margin:13px 0 23px}.mistake-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:19px}.mistake-card{text-align:left;background:#fff;border:1px solid var(--border);border-radius:14px;padding:23px}.mistake-card:hover{border-color:#a3bdec}.mistake-top,.mistake-bottom{display:flex;align-items:center;justify-content:space-between;font-size:12px}.mistake-top>span:last-child{display:flex;align-items:center;gap:5px;font-size:12px}.reviewed{color:#398775}.mistake-card h3{font-size:16px;font-weight:550;margin:18px 0 26px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;line-height:1.8}.mistake-bottom{color:#91a0b4}.mistake-bottom>span:last-child{color:var(--blue);display:flex;align-items:center;gap:6px}.settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:21px}.settings-card{border:1px solid var(--border);background:#fff;padding:26px;border-radius:15px}.settings-card>h2{margin:8px 0 16px}.settings-card>p{font-size:14px;color:#7a8ba4;line-height:1.95;margin:15px 0 20px}.settings-card>.footnote{font-size:12px;color:#98a3b4;margin-bottom:0}.settings-card label{margin:19px 0;font-size:14px;color:#60718c}.connection-tag{border-radius:7px;font-size:11px;padding:4px 8px;background:#f3f5f9;color:#8291a9;white-space:nowrap}.connection-tag.connected{color:#2c8670;background:#e9f6ef}.connection-refresh{display:flex;margin-top:10px}.profile-summary{display:flex;gap:21px;padding:14px 0;border-top:1px solid #eef2f8;border-bottom:1px solid #eef2f8}.profile-summary span{display:grid;gap:5px;color:#8a98ad;font-size:12px}.profile-summary b{font-weight:600;color:#506785;font-size:14px}.provider-name{font-weight:600;color:#2b6f59!important}.inline-flex{display:inline-flex}.logout-button{margin-top:25px;color:#7e8da4}.login-instructions{padding:18px;background:#f5f8fd;border:1px solid #e1e9f6;border-radius:11px;margin-top:20px;font-size:13px;overflow-wrap:anywhere}.login-instructions p{margin:8px 0;color:#7a8ba6}.login-instructions a{display:flex;align-items:center;gap:6px}.login-instructions code{font-size:20px;font-weight:600;letter-spacing:1px;color:#254e91}.demo-banner{display:flex;justify-content:space-between;align-items:center;gap:15px;padding:9px 42px;background:#eaf1ff;color:#5374ad;font-size:12px;border-bottom:1px solid #dce6f8}.demo-banner button{display:flex;gap:7px;align-items:center;font-size:12px;color:var(--blue);white-space:nowrap;min-height:28px}.toast{position:fixed;bottom:26px;left:50%;transform:translate(-50%);max-width:min(580px,90vw);width:max-content;padding:14px 21px;background:#243957;color:#fff;font-size:14px;border-radius:11px;box-shadow:0 8px 30px #17375926;z-index:100;line-height:1.6}.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.boot{height:100vh;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:28px}.boot>p{color:#7e91b0;font-size:14px;display:flex;align-items:center;gap:10px}.inline-error{background:#fff4ef;border:1px solid #f1d8cc;border-radius:10px;padding:12px 16px;color:#a66147;font-size:14px;line-height:1.8;margin:15px 0}.auth-page{min-height:100vh;display:grid;grid-template-columns:1fr 1fr;background:#fff}.auth-story{background:#1b3865;color:#fff;padding:53px 11%;display:flex;flex-direction:column;min-height:100vh}.auth-story .brand-mark{background:#ffffff18;box-shadow:none}.auth-story .brand strong{color:#fff}.auth-story .brand span span{color:#aac1df}.auth-story .brand strong span{color:#9ebadd}.auth-story-text{margin:auto 0;padding:65px 0}.auth-story .eyebrow{color:#9fbbe0;font-size:13px;letter-spacing:2px;margin-bottom:25px}.auth-story h1{font-size:clamp(28px,3vw,43px);line-height:1.6;color:#fff;font-weight:650;letter-spacing:0}.auth-story-text>p{font-size:16px;color:#9eb8db;line-height:2.2;margin:24px 0 38px}.auth-subjects{display:flex;gap:24px;color:#b2c9e6;font-size:13px}.auth-subjects span{display:flex;align-items:center;gap:8px}.auth-subjects svg{width:18px}.auth-bottom{font-size:12px;color:#7e9ac0}.auth-panel{display:flex;align-items:center;justify-content:center;padding:50px 35px}.auth-form{width:100%;max-width:380px}.auth-icon{width:58px;height:58px;background:#eef4ff;border-radius:16px;display:grid;place-items:center;color:var(--blue);margin-bottom:24px}.auth-form h2{font-size:25px;letter-spacing:-.5px;margin-bottom:12px}.auth-form>p{font-size:14px;color:#8b98ab;margin-bottom:25px}.auth-form label{margin:20px 0;font-size:14px;color:#6b7b93}.auth-form input{margin-top:1px}.full{width:100%;margin-top:8px}.role-switch{display:flex;background:#f3f6fb;padding:4px;border-radius:10px;margin:25px 0}.role-switch button{width:50%;border-radius:7px;min-height:40px;font-size:14px;color:#8a98ae}.role-switch .selected{background:#fff;color:var(--blue);box-shadow:0 2px 7px #263d6409}.preview-link{display:flex;align-items:center;gap:4px;margin:22px auto 32px;color:#7a8fae;font-size:13px;padding:7px}.auth-footnote{display:flex;gap:10px;font-size:11px;color:#9ba7b8;line-height:1.8;padding-top:20px;border-top:1px solid #eaf0f7}.auth-footnote svg{margin-top:2px}.dialog-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#13284666;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:60;display:flex;align-items:center;justify-content:center;padding:30px;overflow:auto}.dialog{width:100%;max-width:560px;background:#fff;border-radius:19px;box-shadow:0 30px 100px #09245330;max-height:calc(100dvh - 60px);overflow:auto;outline:none}.dialog.wide{max-width:680px}.dialog-header{display:flex;align-items:center;justify-content:space-between;padding:12px 23px 12px 28px;border-bottom:1px solid #e8edf5;position:sticky;top:0;background:#fff;z-index:2}.dialog-header>span{font-size:14px;font-weight:600;color:#8291a8}.dialog-body{padding:29px}.dialog-body>h2{font-size:25px;line-height:1.65;margin:13px 0 25px}.exercise-meta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#92a1b7}.exercise-question{font-size:19px;color:#344660;line-height:1.9;margin:20px 0 24px;font-weight:550}.reading-passage{padding:22px;background:#f4f8fc;border-radius:12px;border:1px solid #e6edf4;font-family:Georgia,Microsoft YaHei,serif;font-size:18px;line-height:1.9;color:#4d6683}.reading-passage .text-button{font-family:Inter,Microsoft YaHei,sans-serif;margin-top:15px}.options{display:grid;gap:11px}.options button{display:flex;align-items:center;gap:12px;text-align:left;min-height:54px;padding:12px 14px;border:1px solid #dfe6f0;border-radius:11px;font-size:16px;color:#59708f}.options button.selected{background:#edf3ff;border-color:#90adea;color:var(--blue)}.options button>span{width:25px;height:25px;border:1px solid #d9e2ef;background:#fff;border-radius:7px;display:grid;place-items:center;font-size:13px;flex-shrink:0}.options button>svg{margin-left:auto}.options button:disabled{opacity:.85}.answer-label{font-size:14px;color:#7f90a9;max-width:100%}.answer-label input{font-size:17px}.exercise-controls{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:25px}.hint-box{display:flex;align-items:flex-start;gap:10px;background:#fff8e9;border:1px solid #f2e6c7;border-radius:10px;padding:16px;color:#9e823d;margin-top:20px;font-size:14px}.hint-box svg{margin-top:3px}.hint-box p+p{margin-top:9px}.result-box{margin-top:26px;padding:21px;border-radius:12px;background:#f5f9f7;border:1px solid #dcebe3}.result-box.retry{background:#fbf9f5;border-color:#e9e4d7}.result-heading{display:flex;align-items:center;gap:9px;color:#41846c;margin-bottom:18px;font-size:17px}.retry .result-heading{color:#9b8049}.concept{padding-top:16px;margin-top:18px;border-top:1px solid #dae6df;font-size:13px;color:#748f81}.concept strong{color:#59816b;font-size:13px}.concept p{margin-top:6px;line-height:1.9}.result-actions{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;margin-top:22px}.review-answer{background:#f6f9fd;border:1px solid #e5ecf6;border-radius:13px;padding:20px;margin-top:25px}.dialog-body>label{font-size:14px;color:#7b8ba4;margin:20px 0}.dialog-body>label textarea{min-height:145px}.lesson-content{max-width:1020px;padding-top:23px;min-height:calc(100vh - 139px)}.lesson-toolbar{display:flex;justify-content:space-between;align-items:center;gap:10px}.lesson-title{font-size:19px;margin:16px 0 29px;border-bottom:1px solid var(--border);padding-bottom:23px;line-height:1.7;overflow-wrap:anywhere}.messages{padding:0 0 30px;min-height:250px}.message{display:flex;align-items:flex-start;gap:15px;margin:25px 0 35px}.message-avatar{width:33px;height:33px;background:#eaf0ff;color:#5e83d5;display:grid;place-items:center;border-radius:10px;font-size:13px;flex-shrink:0;margin-top:2px}.message.user .message-avatar{background:#e6f0ec;color:#629382}.message-body{flex:1;min-width:0}.message-author{font-size:12px;color:#8d9ab0;display:block;margin:1px 0 11px}.message.user .markdown{background:#fff;border:1px solid var(--border);padding:16px 21px;border-radius:0 13px 13px;display:inline-block}.markdown{font-size:16px;line-height:1.95;color:#364b6b;overflow-wrap:anywhere}.markdown>*:first-child{margin-top:0}.markdown p{margin:12px 0}.markdown p:last-child{margin-bottom:0}.markdown h1,.markdown h2,.markdown h3{font-size:19px;margin:21px 0 10px}.markdown ul,.markdown ol{padding-left:24px;margin:12px 0}.markdown li+li{margin-top:6px}.markdown pre{overflow-x:auto;max-width:100%;padding:12px;background:#edf1f8;border-radius:8px;font-size:13px}.markdown code{font-family:Consolas,monospace;font-size:.9em}.markdown blockquote{margin:18px 0;padding:9px 17px;border-left:3px solid #aac0e8;background:#f0f5fc;color:#6782a6}.markdown table{display:block;max-width:100%;overflow:auto;border-collapse:collapse;font-size:14px}.markdown td,.markdown th{border:1px solid #dce4ef;padding:8px 12px}.markdown .katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}.markdown .katex{font-size:1.1em}.lesson-composer{position:sticky;bottom:0;background:linear-gradient(#f6f8fc00,#f6f8fc 12px);padding-top:13px;padding-bottom:3px}.quick-actions{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}.quick-actions button{display:flex;align-items:center;gap:6px;border:1px solid #dce5f4;border-radius:8px;background:#fff;min-height:38px;font-size:12px;padding:7px 10px;color:#718bae}.quick-actions button:hover:not(:disabled){border-color:#a4beed;color:var(--blue)}.followup-box{background:#fff;border:1px solid #cad9f0;border-radius:14px;padding:12px 16px;box-shadow:0 6px 20px #24467107}.followup-box textarea{height:72px;min-height:56px;border:0;padding:0;font-size:15px;resize:none}.followup-box textarea:focus{outline:0}.followup-box:focus-within{box-shadow:0 0 0 3px #2457da0a;border-color:#9db9ec}.composer-disclaimer{text-align:center;color:#9aa7ba;font-size:11px;padding-top:10px}.photo-preview{display:flex;align-items:center;gap:10px;margin:10px 0;background:#f7f9fd;border-radius:9px;padding:8px;font-size:11px;color:#8a9ab1}.photo-preview img{width:66px;height:66px;object-fit:cover;border-radius:5px}.photo-preview .icon-button{width:30px;height:30px}.photo-preview span{margin-left:auto}.message-photo{display:block;max-width:min(320px,100%);max-height:280px;object-fit:contain;border-radius:8px;margin-bottom:15px;border:1px solid var(--border)}.thinking{display:flex;align-items:center;gap:5px;padding:12px 0;color:#8397b5;font-size:13px}.thinking i{width:5px;height:5px;border-radius:50%;background:#92aadd;animation:pulse 1.2s infinite}.thinking i:nth-child(2){animation-delay:.2s}.thinking i:nth-child(3){animation-delay:.4s}.thinking>span{margin-left:8px}@keyframes pulse{50%{opacity:.25}}.scrim{display:none}@media(min-width:1450px){.content{padding-top:49px}.home-grid{grid-template-columns:minmax(0,1fr) 270px;gap:28px}.home-aside{gap:23px}.question-card{padding:25px 28px 18px}.question-card textarea{height:147px}.exercise-card{min-height:204px;padding:21px}.page-heading{margin-bottom:34px}}@media(max-width:1190px){.sidebar{width:213px;padding:27px 16px}.main-shell{margin-left:213px}.topbar{padding:0 28px}.content{padding:31px 28px}.home-grid{grid-template-columns:minmax(0,1fr) 220px;gap:19px}.question-card{padding:19px 18px 13px}.exercise-cards{gap:9px}.exercise-card{padding:15px 12px}.exercise-card h3{font-size:15px}.exercise-card>div{font-size:10px}.home-aside .progress-card{padding:21px 18px}.steps-card{padding:20px 14px}.study-step{gap:10px}.page-footer,.demo-banner{padding-left:28px;padding-right:28px}}@media(max-width:1020px){.home-grid{grid-template-columns:minmax(0,1fr)}.home-aside{display:grid;grid-template-columns:1fr 1.2fr;gap:18px}.progress-card{padding:22px}.progress-number{font-size:35px}.progress-details{margin-top:20px;padding-top:16px}.progress-card>p{margin-top:17px}.steps-card{padding:21px}.study-step{margin-top:16px}.parent-disclosure{grid-column:1/-1}.exercise-card{min-height:177px}.sidebar{width:205px}.main-shell{margin-left:205px}.topbar{height:73px;padding:0 24px}.topbar-title{font-size:12px}.topbar-right{gap:12px}.content{padding:30px 24px}.settings-grid{grid-template-columns:1fr}.mistake-list{grid-template-columns:1fr 1fr}.mistake-card{padding:18px}.auth-story{padding:40px 10%}.auth-panel{padding:40px 26px}.auth-form h2{font-size:23px}}@media(max-width:760px){.sidebar{transform:translate(-100%);transition:transform .2s;width:265px;padding:27px 22px;box-shadow:15px 0 60px #172f5b22}.sidebar.show{transform:translate(0)}.sidebar .profile-pill{margin-top:33px}.mobile-close{display:inline-flex;position:absolute;right:13px;top:26px;width:32px;height:32px;color:#8e9bb0}.mobile-menu{display:inline-flex;width:37px;height:38px;color:#8194b1;margin-left:-7px}.scrim{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#15294555;z-index:29}.main-shell{margin-left:0}.topbar{height:63px;padding:0 22px;gap:10px}.topbar-title{margin-right:auto;font-size:12px}.topbar-right{gap:10px}.grade-tag{font-size:11px;padding:3px 7px}.round-avatar{display:none}.content{padding:27px 23px 32px;min-height:calc(100dvh - 181px)}.page-heading{margin-bottom:25px}.page-heading h1{font-size:28px;line-height:1.5;margin:8px 0 10px}.page-heading>p{font-size:14px;line-height:1.8}.eyebrow.blue{font-size:12px}.question-card{padding:20px 21px 14px}.question-card textarea{height:121px;font-size:16px}.subject-tabs{margin-top:18px}.subject-tabs button{font-size:14px;min-height:39px}.input-note{font-size:12px;line-height:1.6}.photo-button{font-size:14px}.ask-button{min-height:44px}.home-grid{gap:24px}.exercise-cards{gap:12px}.exercise-card{padding:17px;min-height:193px}.exercise-card h3{font-size:16px}.exercise-card>div{font-size:11px}.exercise-card .small-tag{font-size:12px}.learning-tip{margin-top:22px}.learning-tip strong{font-size:14px}.learning-tip p{font-size:13px;line-height:1.8}.home-aside{gap:16px}.study-step strong{font-size:14px}.study-step p{font-size:12px}.progress-card .section-title h2{font-size:16px}.progress-details span,.progress-number>span,.progress-card>p{font-size:12px}.parent-disclosure{font-size:12px}.page-footer{padding:15px 24px 92px;font-size:12px}.bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;min-height:67px;padding:5px 16px max(7px,env(safe-area-inset-bottom));background:#fffffff5;border-top:1px solid #e2e9f3;-webkit-backdrop-filter:blur(15px);backdrop-filter:blur(15px);z-index:35;justify-content:space-around;gap:10px}.bottom-nav button{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:5px 0;font-size:11px;color:#91a0b6}.bottom-nav svg{width:21px;height:21px;stroke-width:1.8}.bottom-nav .active{color:var(--blue)}.bottom-nav .active:before{content:"";width:28px;height:24px;background:#eaf1ff;position:absolute;z-index:-1;border-radius:9px;transform:translateY(-10px)}.demo-banner{padding:8px 23px;font-size:11px;gap:8px;flex-wrap:wrap}.demo-banner button{font-size:12px}.practice-row{padding:18px;gap:15px}.practice-row p{font-size:14px;line-height:1.8}.practice-row h3{font-size:17px}.practice-list{gap:13px}.practice-row .subject-icon{width:44px;height:44px;border-radius:12px}.row-kicker{font-size:12px}.filter-tabs{margin-bottom:21px}.mistake-card h3{font-size:16px}.mistake-list{gap:13px}.empty-state{padding:47px 22px}.settings-card{padding:22px}.settings-card>p{font-size:15px}.footnote{font-size:13px}.settings-card>.footnote{font-size:13px}.profile-summary{gap:30px}.connection-tag{font-size:12px}.lesson-content{padding:16px 21px 10px}.lesson-title{font-size:17px;padding-bottom:19px}.message{gap:11px;margin-bottom:28px}.message-avatar{width:30px;height:30px;border-radius:9px}.message.user .markdown{padding:13px 15px}.markdown{font-size:16px;line-height:1.95}.message-author{font-size:12px}.quick-actions{gap:7px}.quick-actions button{font-size:13px;padding:8px 9px;min-height:39px}.lesson-composer{bottom:67px;padding-top:11px;padding-bottom:8px}.followup-box{padding:13px}.followup-box textarea{font-size:16px}.composer-disclaimer{font-size:11px}.toast{bottom:88px;padding:12px 18px;font-size:14px}.dialog-backdrop{padding:20px 15px}.dialog{max-height:calc(100dvh - 40px);border-radius:16px}.dialog-body{padding:24px}.dialog-header{padding:10px 14px 10px 23px}.dialog-body>h2{font-size:23px}.reading-passage{padding:19px;font-size:18px}.exercise-question{font-size:18px}.result-box{padding:18px}.auth-page{grid-template-columns:1fr}.auth-story{min-height:auto;padding:29px 30px 30px}.auth-story .brand-mark{width:35px;height:35px}.auth-story .brand strong{font-size:20px}.auth-story-text{padding:27px 0 4px}.auth-story .eyebrow{display:none}.auth-story h1{font-size:26px;line-height:1.6}.auth-story-text>p{display:none}.auth-subjects{margin-top:22px;gap:25px}.auth-bottom{display:none}.auth-panel{padding:31px 28px 40px;align-items:flex-start}.auth-form{max-width:430px}.auth-icon{display:none}.auth-form h2{font-size:23px}.auth-form>p{font-size:14px}.auth-footnote{font-size:12px}.auth-form label{font-size:15px}.auth-form input{min-height:50px}.role-switch button{font-size:15px;min-height:43px}.primary.full{min-height:49px}.preview-link{font-size:14px;margin-bottom:24px}}@media(max-width:460px){.content{padding:25px 18px}.topbar{padding:0 18px}.topbar-title{font-size:11px}.grade-tag{font-size:10px}.page-heading h1{font-size:25px;letter-spacing:-.05em}.page-heading>p{font-size:13px}.card-caption{font-size:13px}.card-caption .muted{font-size:11px}.question-card{padding:18px 16px 12px;border-radius:14px}.subject-tabs button{padding:7px 12px}.question-card textarea{height:136px}.primary,.secondary{font-size:14px;padding:10px 13px}.exercise-cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.exercise-card{min-height:177px;padding:16px}.exercise-card:nth-child(3){display:none}.exercise-card h3{font-size:16px;margin-bottom:16px}.practice-section{margin-top:26px}.section-title{gap:8px}.section-title h2{font-size:16px}.text-button{font-size:13px}.learning-tip{padding:16px 14px;gap:11px}.learning-tip .tip-icon{width:33px;height:33px}.learning-tip p{font-size:12px}.home-aside{grid-template-columns:1fr}.progress-card{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.progress-card .section-title{grid-column:1/-1;margin-bottom:15px}.progress-card .progress-number{font-size:34px}.progress-details{margin:0;border:0;padding-top:6px;gap:22px;justify-content:flex-end}.progress-details b{font-size:23px}.progress-card>p{grid-column:1/-1;margin-top:17px}.steps-card{display:none}.parent-disclosure{padding:0 3px}.page-footer{padding-left:18px;padding-right:18px}.page-footer>span{display:none}.filter-tabs button{padding:9px 19px}.mistake-list{grid-template-columns:1fr}.practice-row{padding:16px 14px;gap:12px}.practice-row p{font-size:13px}.practice-row .subject-icon{width:41px;height:44px}.practice-row h3{font-size:16px}.row-kicker{font-size:11px}.dialog-backdrop{padding:12px 10px}.dialog{max-height:calc(100dvh - 24px);border-radius:14px}.dialog-body{padding:21px 18px}.dialog-header{padding-left:19px}.dialog-body>h2{font-size:22px;margin-bottom:21px}.exercise-controls{gap:10px}.exercise-controls button{font-size:13px}.result-heading{font-size:16px;align-items:flex-start}.result-heading svg{width:22px}.result-actions{gap:8px}.result-actions>.secondary{font-size:13px}.reading-passage{font-size:17px;padding:17px}.options button{font-size:15px}.lesson-content{padding:14px 17px}.message{gap:9px}.message-avatar{width:28px;height:28px}.quick-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.quick-actions button{justify-content:center}.photo-preview span{font-size:11px;max-width:100px}.settings-card{padding:21px}.profile-summary{justify-content:space-between;gap:10px}.demo-banner{padding:7px 18px}.auth-story{padding:26px}.auth-story h1{font-size:25px}.auth-panel{padding:29px 25px}.auth-form h2{font-size:22px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media(min-width:761px){.icon-button.mobile-menu,.icon-button.mobile-close{display:none}.profile-pill div>span{font-size:11px;white-space:nowrap}}@media(max-width:760px){.sidebar{visibility:hidden}.sidebar.show{visibility:visible}}.options button.answer-correct{background:#edf8f2;border-color:#9fceba;color:#32795f}.options button.answer-wrong{background:#fff5ef;border-color:#e3b9a5;color:#a6684c}.password-success{background:#edf8f1;border:1px solid #cfe8da;border-radius:10px;padding:12px 16px;color:#337458;font-size:14px;line-height:1.8;margin:15px 0}.auth-form>.password-help{font-size:13px;line-height:1.8;color:#71829c;margin:18px 0 0}.library-entry{width:100%;display:flex;align-items:center;gap:14px;padding:18px 20px;margin-top:20px;border:1px solid #dce6f5;border-radius:13px;background:#f2f6ff;text-align:left;color:#5176b5}.library-entry>span{display:grid;gap:4px;flex:1}.library-entry strong{font-size:15px}.library-entry small{font-size:12px;color:#8698b4}.library-intro{display:flex;gap:15px;padding:21px 24px;border:1px solid #dbe6f4;border-radius:15px;background:#f0f5ff;color:#4d709f;margin-bottom:24px}.library-intro>svg{flex-shrink:0;margin-top:3px}.library-intro p{font-size:13px;line-height:1.9;color:#778aa6;margin-top:8px}.library-toolbar{display:grid;grid-template-columns:180px minmax(0,1fr);gap:18px;margin:20px 0}.library-toolbar label{font-size:13px;color:#70829e}.library-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:19px}.library-card{display:flex;flex-direction:column;align-items:flex-start;min-width:0;background:#fff;padding:23px;border:1px solid var(--border);border-radius:15px}.library-card-meta{display:flex;width:100%;align-items:center;justify-content:space-between;gap:8px;font-size:11px;color:#94a1b6}.library-card h2{font-size:18px;line-height:1.6;margin:17px 0 12px;overflow-wrap:anywhere}.library-card>p{font-size:14px;line-height:1.9;color:#788ba5;margin-bottom:15px}.library-card .library-edition{font-size:12px;color:#97a5b8}.library-card details{width:100%;margin-bottom:20px}.library-card summary{font-size:13px;color:var(--blue);cursor:pointer;padding:7px 0}.library-card details .markdown{font-size:14px;margin-top:12px}.library-card>button,.library-links{margin-top:auto}.library-links{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.library-links a{display:inline-flex;align-items:center;gap:7px}.library-loading{display:flex;align-items:center;gap:10px}.material-context{display:flex;align-items:center;gap:12px;padding:15px 18px;margin-bottom:20px;background:#edf4ff;border:1px solid #dce7f8;border-radius:12px;color:#587bad}.material-context>div{display:grid;gap:4px;flex:1;min-width:0}.material-context strong{font-size:13px}.material-context span{font-size:11px;color:#8195b0}.subject-tabs{flex-wrap:wrap}.subject-tabs select{width:auto;max-width:165px;min-height:39px;font-size:14px;margin:0;padding:7px 12px}.library-tabs{flex-wrap:wrap}@media(max-width:760px){.library-grid,.library-toolbar{grid-template-columns:1fr}.library-card{padding:21px}.library-intro{padding:18px}.library-intro p{font-size:13px}.library-card h2{font-size:17px}.library-card>p,.library-card details .markdown{font-size:15px}.library-entry{padding:16px}.library-entry strong{font-size:14px}.library-entry small{font-size:11px}}.version-badge{font-size:11px;opacity:.75;margin-left:8px;white-space:nowrap}.speech-player{width:100%;margin:14px 0;padding:10px 12px;border:1px solid #dbe5f4;border-radius:12px;background:#f5f8ff;color:#42649b;font-size:13px;line-height:1.6;min-width:0}.speech-player.active{border-color:#a7bfec;background:#f0f5ff}.speech-controls{display:flex;align-items:center;gap:4px;flex-wrap:wrap}.speech-play{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:8px 10px;border-radius:8px;color:var(--blue);font-weight:600;flex-shrink:0}.speech-play:hover{background:#e5edfc}.speech-controls .icon-button{height:44px;width:40px}.speech-settings{min-height:44px;padding:8px 6px;margin-left:auto;font-size:12px;color:#60789c}.speech-progress{font-size:12px;color:#55719b;padding:2px 9px 6px;overflow-wrap:anywhere}.speech-current{font-size:13px!important;line-height:1.7!important;color:#5c7291;margin:0!important;padding:2px 9px 9px;overflow-wrap:anywhere}.speech-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;padding:10px 8px 2px;border-top:1px solid #dce6f5;margin-top:4px}.speech-options label{font-size:12px!important;margin:0!important;color:#597399}.speech-options select{width:100%;min-height:44px;font-size:14px;padding:7px 9px;margin-top:5px;background:#fff}.speech-options p{grid-column:1/-1;font-size:11px!important;line-height:1.8!important;color:#7789a3;margin:0!important}.speech-unavailable{font-size:12px;color:#7c8ba1}.reading-passage .speech-player{font-family:Inter,Segoe UI,Microsoft YaHei,sans-serif}.library-card .speech-player{margin-top:15px}.speech-mode{grid-column:1/-1}.composer-bar{display:flex;align-items:center;gap:10px;min-height:46px;padding:3px 2px 7px}.composer-toggle{display:flex;align-items:center;gap:6px;min-height:42px;flex-shrink:0;color:var(--blue);font-size:13px}.composer-status{display:flex;align-items:center;gap:6px;color:#788ba5;font-size:12px;flex:1;min-width:0}.composer-status svg{width:14px;height:14px;flex-shrink:0}.composer-stop{display:flex;align-items:center;gap:5px;min-height:42px;padding:7px 10px;background:#edf2fc;border-radius:8px;font-size:12px;color:#5c7398;flex-shrink:0}.lesson-composer.collapsed{padding-top:4px;padding-bottom:4px;border-top:1px solid #dfe7f3}.lesson-composer.collapsed .composer-bar{padding-bottom:0}.latest-answer{white-space:nowrap;font-size:12px}#lesson-compose-tools[hidden]{display:none}@media(max-width:760px){.composer-bar{gap:7px}.composer-status{font-size:11px}.composer-toggle{font-size:12px}.lesson-composer.collapsed{padding-top:0;padding-bottom:0}.quick-actions button{min-height:42px}.composer-stop{padding:6px 8px}}@media(max-width:460px){.speech-player{padding:7px}.speech-play{font-size:13px;padding:7px}.speech-controls .icon-button{width:34px}.speech-settings{font-size:11px}.speech-options{gap:9px;padding:9px 5px 2px}.speech-options select{font-size:13px;padding:6px}.speech-current{font-size:12px!important}}.messages-end{scroll-margin-bottom:80px}@media(max-width:760px){.messages-end{scroll-margin-bottom:calc(180px + env(safe-area-inset-bottom,0px))}.lesson-composer{bottom:calc(91px + env(safe-area-inset-bottom,0px))}.lesson-composer.collapsed{padding:4px 8px;border:1px solid #dfe7f3;border-radius:12px;background:#f8faff;box-shadow:0 4px 16px #24436b0b}.composer-toggle{min-height:44px;padding:0 5px}}.speech-current{display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}.notebook-detail-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.notebook-delete{color:#a35d66!important;min-height:44px}.notebook-archive{margin-top:26px;padding:18px;background:#fff;border:1px solid #e2e8f1;border-radius:12px}.notebook-archive summary{cursor:pointer;color:#77869b;min-height:32px}.archived-row{display:flex;gap:12px;align-items:center;border-top:1px solid #edf1f6;padding:13px 0}.archived-row p{flex:1;min-width:0;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.archived-row button{flex-shrink:0}.notebook-detail{scroll-margin-top:20px}.notebook-progress{display:flex;align-items:center;gap:10px;padding:14px 18px;background:#eaf1ff;border:1px solid #d7e3fa;border-radius:12px;margin:16px 0;font-size:13px;color:#42649b}.notebook-progress span{flex:1}.notebook-progress svg{flex-shrink:0}.notebook-filters{display:flex;gap:18px;align-items:center;justify-content:space-between;margin:22px 0}.notebook-subjects{display:flex;flex-wrap:wrap;gap:8px}.notebook-subjects button{display:flex;align-items:center;gap:8px;min-height:44px;padding:8px 14px;background:#fff;border:1px solid #dfe7f3;border-radius:9px;color:#637692;font-size:14px}.notebook-subjects button.selected{background:#e9f0ff;color:var(--blue);border-color:#b7caf2}.notebook-subjects span{font-size:11px;opacity:.7}.notebook-filters label{font-size:12px;min-width:110px}.notebook-filters select{margin:4px 0 0;width:100%;min-height:40px}.knowledge-section{margin:25px 0}.knowledge-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin-top:16px}.knowledge-card{padding:19px;background:#fff;border:1px solid #dfe7f3;border-radius:14px}.knowledge-card h3{font-size:16px;margin:13px 0 8px}.knowledge-card p{font-size:12px;line-height:1.9;color:#75839a}.knowledge-card .secondary{margin-top:12px;width:100%;justify-content:center}.notebook-layout{display:grid;grid-template-columns:minmax(230px,.8fr) minmax(0,1.6fr);gap:22px;align-items:start}.notebook-list{display:grid;gap:12px}.notebook-list h2{font-size:17px;margin:0 0 4px}.notebook-list .mistake-card{width:100%;text-align:left;min-width:0}.notebook-list .mistake-card.selected{border-color:#83a6eb;background:#f3f7ff;box-shadow:0 0 0 2px #e7efff}.notebook-list .mistake-card h3{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;font-size:14px;line-height:1.8;margin:12px 0}.notebook-detail{background:#fff;border:1px solid #dfe7f3;border-radius:16px;padding:24px;min-width:0}.notebook-detail h2{font-size:19px}.notebook-detail .section-title{gap:12px;flex-wrap:wrap}.notebook-detail .markdown{font-size:14px}.notebook-photo{max-width:100%;max-height:480px;object-fit:contain;border:1px solid #e1e7f0;border-radius:10px;margin:14px 0}.notebook-note{padding:13px 16px;border-radius:10px;background:#f8fafc;margin:16px 0}.notebook-detail details{margin:16px 0;padding:12px 0;border-top:1px solid #e7ecf4}.notebook-detail summary{cursor:pointer;color:#5c75a0;font-size:13px;min-height:36px;line-height:36px}.notebook-analysis{margin-top:22px;padding-top:18px;border-top:1px solid #e7ecf4}.notebook-analysis p{font-size:13px;line-height:1.9;color:#6c7c94}.notebook-analysis h3,.targeted-section h3{font-size:16px}.concept-row{padding:16px 0;border-bottom:1px solid #edf1f7}.concept-row h4{font-size:14px;margin:0 0 8px}.concept-row small{font-size:11px;font-weight:400;color:#8998ac;margin-left:8px}.concept-row button{margin-top:8px}.targeted-section{margin-top:24px}.targeted-section label{font-size:13px}.targeted-section select{width:100%;min-height:44px;margin-top:6px}.targeted-card{margin-top:18px;padding:18px;border:1px solid #d9e5f7;border-radius:12px;background:#f8faff}.targeted-card textarea{min-height:140px;margin:10px 0 16px;background:#fff}.targeted-card .result-box{padding:16px;margin-top:18px}.targeted-card li,.targeted-card .result-box p{font-size:13px;line-height:1.85}.notebook-empty{font-size:13px;padding:20px;color:#8794a7;background:#f3f6fa;border-radius:10px}.quick-actions{grid-template-columns:repeat(3,minmax(0,1fr))}@media(max-width:1000px){.notebook-layout{grid-template-columns:1fr}.notebook-list{grid-template-columns:repeat(2,minmax(0,1fr))}.notebook-list h2{grid-column:1/-1}}@media(max-width:760px){.notebook-filters{align-items:flex-start;flex-direction:column;gap:12px}.notebook-filters label{display:flex;gap:12px;align-items:center}.notebook-filters select{width:130px;margin:0}.notebook-detail{padding:17px}.notebook-list,.knowledge-grid{grid-template-columns:1fr}.targeted-card{padding:13px}.quick-actions{grid-template-columns:repeat(2,minmax(0,1fr))}.notebook-progress{padding:12px;font-size:12px;align-items:flex-start}.notebook-detail .section-title h2{font-size:17px}}