:root{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:#25324a;background:#f6f8fb;font-synthesis:none;--blue:#2456db;--muted:#7b879b;--line:#e6ebf2}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;border:0;background:none;color:inherit}button:disabled{cursor:default;opacity:.45}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #7da3ff;outline-offset:3px}a{color:var(--blue)}.sidebar{position:fixed;inset:0 auto 0 0;width:235px;background:white;border-right:1px solid var(--line);padding:36px 23px;display:flex;flex-direction:column}.brand{display:flex;gap:11px;align-items:center;font-size:21px;font-weight:750;text-decoration:none;color:#22304a;letter-spacing:1px}.brand-icon{display:grid;place-items:center;width:38px;height:42px;border-radius:11px;background:var(--blue);color:#fff;font-size:32px}.brand small{display:block;font-size:8px;letter-spacing:1.2px;color:#8b97ab;margin-top:6px}.nav-label{color:#a2acbc;font-size:10px;letter-spacing:2px;margin:48px 12px 15px}nav{display:grid;gap:8px}.nav-button{display:flex;align-items:center;gap:13px;text-align:left;padding:13px 14px;border-radius:9px;font-size:13px;color:#6f7c91}.nav-button>span{font-size:19px;width:19px;text-align:center}.nav-button.active{background:#edf2ff;color:var(--blue);font-weight:650}.nav-button b{margin-left:auto;font-size:10px;border-radius:5px;background:#e1e9fd;padding:2px 6px}.sidebar-bottom{margin-top:auto;padding-top:30px}.live-dot{font-size:11px;color:#50637c}.live-dot:before{content:"";display:inline-block;width:6px;height:6px;background:#4ea18f;border-radius:50%;margin-right:7px}.sidebar-bottom p{font-size:10px;line-height:1.9;color:#96a0af}.backup-actions{display:flex;gap:10px}.backup-actions button{font-size:10px;color:#718099;text-decoration:underline}.workspace{margin-left:235px}.topbar{height:78px;padding:0 45px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);font-size:12px;background:#ffffff90}.topbar>span:last-child{color:#8591a4;font-size:11px}.pill{display:inline-block;font-size:10px;border:1px solid #dbe4f8;background:#f1f5ff;color:#4268ba;border-radius:5px;padding:3px 7px;margin-left:8px}main{max-width:1240px;margin:auto;padding:39px 44px 45px;min-height:calc(100vh - 140px)}h1,h2,h3,p{margin-top:0}h1{font-size:29px;letter-spacing:-.7px;line-height:1.5;margin-bottom:7px}h2{font-size:18px;line-height:1.6;margin-bottom:13px}h3{font-size:14px}p{line-height:1.9}.intro{color:#7b879b;font-size:12px;margin-bottom:27px}.eyebrow{font-size:10px;letter-spacing:2px;color:#7f91b0;margin-bottom:9px}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px;margin-bottom:25px}.stat{border:1px solid var(--line);border-radius:12px;background:white;padding:20px 22px}.stat small{display:block;font-size:11px;color:#7c899e}.stat strong{display:inline-block;font-size:30px;margin:11px 0 4px;font-weight:650;letter-spacing:-1px}.stat em{font-size:11px;font-style:normal;color:#a0aaba;margin-left:5px}.stat p{font-size:10px;color:#99a4b5;margin:0}.stat.accent strong{color:var(--blue)}.home-grid{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(260px,1fr);gap:23px}.card{background:white;border:1px solid var(--line);border-radius:13px;padding:25px}.continue-card{background:#eef3ff;border-color:#e2eaff;position:relative;overflow:hidden;padding:29px;min-height:250px}.continue-card h2{font-size:24px;position:relative}.continue-card p{font-size:12px;max-width:360px;color:#7082a2;position:relative}.continue-card .primary{margin-top:7px}.wave-art{position:absolute;width:220px;height:220px;right:-70px;top:24px;border:1px solid #c6d6fc;border-radius:50%;box-shadow:0 0 0 23px #edf2ff,0 0 0 24px #d6e1fb,0 0 0 46px #edf2ff,0 0 0 47px #dfe8fc;pointer-events:none}.primary,.secondary,.warning-button{display:inline-flex;justify-content:center;align-items:center;gap:10px;border-radius:8px;padding:12px 18px;font-weight:600;font-size:12px;min-height:42px}.primary{color:white;background:var(--blue);box-shadow:0 5px 12px #2456db18}.primary:hover{background:#1944ba}.secondary{border:1px solid #dce3ed;background:white;color:#63738b}.secondary:hover{background:#f4f7fc}.warning-button{background:#fff6e6;border:1px solid #f0dfb9;color:#9c7532}.text-button{font-size:12px;color:var(--blue);padding:5px 0}.progress-track{height:5px;border-radius:10px;background:#dde5f6;overflow:hidden;margin:23px 0 8px}.progress-track>div{height:100%;background:var(--blue);border-radius:10px}.progress-meta{display:flex;justify-content:space-between;font-size:10px;color:#8292ad}.review-count{font-size:47px;color:#253c69;font-weight:650;letter-spacing:-2px;margin:18px 0 4px}.review-card p{font-size:11px;color:#8c97a9}.review-card .secondary{width:100%;margin-top:12px}.card-heading{display:flex;align-items:center;justify-content:space-between;gap:10px}.card-heading h2{font-size:14px;margin:0}.card-heading small{font-size:10px;color:#9aa5b5}.section-card{margin-top:23px}.chapter{display:flex;gap:14px;align-items:center;padding:16px 0;border-bottom:1px solid #f0f3f7}.chapter:last-child{border:0;padding-bottom:0}.chapter-icon{background:#f3f6fb;border-radius:8px;padding:10px;color:#7286a7;font-size:11px}.chapter-text{flex:1}.chapter-text strong{font-size:12px;font-weight:550}.chapter-text small{display:block;font-size:10px;color:#9ba5b4;margin-top:6px}.chapter .text-button{font-size:11px}.aside-note{margin-top:23px;background:#f0f7f5;border:1px solid #e1eeea;border-radius:12px;padding:23px}.aside-note h3{color:#487868}.aside-note p{font-size:11px;color:#7b938c;margin-bottom:0}.quiz-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:24px}.quiz-card{padding:30px}.question-meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:10px;color:#94a0b2;margin-bottom:22px}.tag{padding:4px 8px;border-radius:5px;background:#eef3ff;color:#5272b7}.tag.amber{background:#fff4e2;color:#a17b37}.tag.red{background:#fff0ef;color:#b96660}.tag.green{background:#eaf6ef;color:#4b8766}.question-title{font-size:19px;font-weight:600;line-height:1.9;margin-bottom:22px;overflow-wrap:anywhere}.question-figure{display:block;max-width:100%;margin:5px auto 23px;text-align:center}.question-figure img{max-width:100%;max-height:270px;object-fit:contain;background:white}.question-figure small{display:block;font-size:10px;color:#96a0ae;margin-top:6px}.options{display:grid;gap:12px}.option{display:flex;align-items:center;text-align:left;gap:13px;width:100%;border:1px solid #e2e8f0;background:white;border-radius:9px;padding:15px 17px;line-height:1.75;font-size:13px;transition:background .12s,border-color .12s;color:#56647b}.option .letter{flex:0 0 28px;height:28px;border:1px solid #e1e6ee;border-radius:7px;display:grid;place-items:center;font-size:11px;color:#8d9aaf;background:#fafbfd}.option.selected{border-color:#7da1fa;background:#f1f5ff;color:#2852b5}.option.selected .letter{background:#3b67d8;color:white;border-color:#3b67d8}.option.correct{border-color:#76b897;background:#eef9f2;color:#3a7c58}.option.incorrect{border-color:#d9a29d;background:#fff3f2;color:#ae6660}.option:disabled{opacity:1}.option .option-text{flex:1;overflow-wrap:anywhere}.option .result-icon{font-size:16px}.quiz-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}.quiz-actions .primary{min-width:130px}.feedback{margin-top:22px;padding:18px;border-radius:9px;background:#f1f6ff;border:1px solid #dfe8fa;font-size:12px;line-height:1.9}.feedback strong{font-size:14px;display:block;color:#4269b2;margin-bottom:5px}.feedback.wrong{background:#fff5f3;border-color:#f1ded9}.feedback.wrong strong{color:#b96a5b}.feedback.unsure{background:#fff9ed;border-color:#efe3c9}.feedback.unsure strong{color:#9f7c3b}.quiz-bottom{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:20px;font-size:10px;color:#9ba6b5}.question-jump{display:flex;gap:8px;align-items:center;margin:17px 0}.question-jump input{width:85px;padding:8px;border:1px solid #e1e7f0;border-radius:6px}.side-card{padding:22px;margin-bottom:16px}.side-card p{font-size:11px;color:#8c98ac}.side-card h3{font-size:12px}.step-list{display:flex;flex-wrap:wrap;gap:6px}.step{font-size:10px;padding:7px;background:#f4f6fa;border-radius:5px;color:#97a2b4}.step.active{background:#e8efff;color:#3561bd}.hint{font-size:11px;color:#96a0b1;line-height:1.9}.list-tools{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.list-tools input{flex:1;min-width:150px;padding:11px 14px;border:1px solid #e0e6ef;border-radius:8px;background:white;font-size:12px}.list-tools select{font-size:12px;border:1px solid #e0e6ef;border-radius:8px;padding:10px;background:white;color:#6b7990}.question-row{display:flex;gap:18px;align-items:center;border-bottom:1px solid #edf0f5;padding:19px 0}.question-row:last-child{border:0}.question-row>div{flex:1;min-width:0}.question-row p{font-size:12px;line-height:1.8;margin:7px 0;color:#53627b;overflow-wrap:anywhere}.question-row small{font-size:10px;color:#9aa5b6}.question-row .secondary{white-space:nowrap;padding:9px 13px;min-height:36px}.empty{text-align:center;padding:65px 20px}.empty p{font-size:12px;color:#8b96aa}.empty-icon{font-size:40px;color:#a7bde8;margin-bottom:16px}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:15px}.pagination{display:flex;align-items:center;justify-content:center;gap:20px;margin-top:20px;font-size:11px;color:#8b97aa}.timeline{display:grid;grid-template-columns:repeat(7,1fr);gap:8px;margin:25px 0}.timeline>div{text-align:center;border:1px solid #e5ebf4;background:#f8faff;border-radius:9px;padding:18px 4px}.timeline strong{display:block;font-size:17px;color:#3a5eaa;margin-bottom:9px}.timeline small{font-size:10px;color:#8c9ab2}.forecast{display:grid;grid-template-columns:repeat(7,1fr);gap:14px;align-items:end;height:170px;margin:25px 0}.forecast>div{height:100%;display:flex;flex-direction:column;justify-content:flex-end;text-align:center;font-size:10px;color:#8d9aad}.forecast .bar{background:#c7d8ff;min-height:4px;max-height:130px;border-radius:5px 5px 0 0;margin:8px 0}.forecast small{font-size:10px}.plan-grid{display:grid;grid-template-columns:1fr 1fr;gap:23px;margin-top:23px}.plan-grid p,.plan-copy{font-size:12px;color:#7d8ba1;line-height:2}.source-links{border-top:1px solid var(--line);margin-top:20px;padding-top:18px;font-size:11px;color:#8e9aab;line-height:2}.source-links a{color:#6c83ad}footer{max-width:1240px;margin:auto;padding:0 44px 22px;font-size:10px;color:#a0a9b8;display:flex;justify-content:space-between;gap:10px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);max-width:90vw;background:#263956;color:white;border-radius:9px;padding:13px 20px;z-index:20;font-size:12px;box-shadow:0 10px 30px #223c4933}dialog{border:1px solid #e4e9f2;border-radius:14px;padding:28px;max-width:min(500px,90vw);color:#3e506c}dialog::backdrop{background:#1a2b4c60}dialog p{font-size:12px;color:#8792a6}dialog form{display:flex;justify-content:flex-end;gap:9px;margin-top:25px}#image-dialog{max-width:90vw;max-height:90vh}#image-dialog img{display:block;max-width:100%;max-height:72vh;margin-top:15px}#image-dialog button{float:right}.storage-warning{padding:14px;border:1px solid #e4cfa4;background:#fff6e5;color:#9d722e;border-radius:8px;font-size:12px;margin-bottom:15px}
@media(min-width:1500px){main{padding-top:50px}.sidebar{width:250px}.workspace{margin-left:250px}}
@media(max-width:1100px){.sidebar{width:200px;padding:30px 17px}.workspace{margin-left:200px}main{padding:28px 25px}.topbar{padding:0 25px}.quiz-layout{grid-template-columns:minmax(0,1fr)}.quiz-aside{display:grid;grid-template-columns:1fr 1fr;gap:15px}.home-grid{grid-template-columns:minmax(0,1.4fr) minmax(220px,1fr)}.stat{padding:17px}footer{padding:0 25px 20px}}
@media(max-width:760px){.sidebar{position:static;width:100%;padding:19px 18px 0;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:19px}.brand small{font-size:7px}.brand-icon{width:33px;height:36px;font-size:26px}.nav-label{display:none}nav{display:flex;gap:2px;justify-content:space-between;margin-top:19px;overflow:auto}.nav-button{padding:12px 7px;border-radius:7px 7px 0 0;gap:5px;white-space:nowrap;font-size:11px}.nav-button>span{font-size:15px;width:15px}.nav-button b{font-size:9px;padding:1px 4px}.sidebar-bottom{padding:0;position:absolute;top:22px;right:16px}.sidebar-bottom p,.live-dot{display:none}.backup-actions{gap:8px}.backup-actions button{font-size:9px}.workspace{margin:0}.topbar{height:48px;padding:0 19px;font-size:10px}.topbar>span:last-child{font-size:10px}main{padding:24px 17px 35px}h1{font-size:25px}.intro{font-size:11px;margin-bottom:21px}.stats{grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:18px}.stat{padding:16px 19px}.stat strong{font-size:27px;margin-top:7px}.stat p{font-size:9px}.home-grid,.plan-grid{grid-template-columns:1fr;gap:17px}.continue-card{padding:24px;min-height:230px}.review-card{padding:22px}.review-count{font-size:35px;margin:12px 0}.section-card,.aside-note{margin-top:17px}.card{padding:21px}.quiz-card{padding:21px 18px}.question-title{font-size:17px;line-height:1.9}.option{padding:13px 11px;gap:10px;font-size:12px}.quiz-aside{grid-template-columns:1fr;gap:0}.quiz-layout{gap:17px}.quiz-actions{gap:8px}.quiz-actions button{flex:1;padding:12px 10px;font-size:11px}.quiz-actions .primary{min-width:100px}.timeline{gap:5px;grid-template-columns:repeat(4,1fr)}.timeline>div{padding:13px 3px}.timeline strong{font-size:14px}.question-row{gap:10px}.question-row p{font-size:11px}.question-row .secondary{padding:8px;font-size:10px}.page-heading{align-items:flex-start}.page-heading .primary{padding:10px;font-size:10px}.question-meta{margin-bottom:17px}footer{padding:0 18px 20px;display:block;font-size:9px;line-height:2}footer span{display:block}.plan-grid{margin-top:17px}.question-jump input{font-size:12px}.quiz-bottom{flex-wrap:wrap}.forecast{gap:7px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
.continue-card>*:not(.wave-art){position:relative;z-index:1}
.topbar-right{display:flex;align-items:center;gap:16px;min-width:0}
#sync-status{font-size:10px;color:#7b8eab;white-space:nowrap}
.account-button{border:1px solid #cfdcf8;background:#edf3ff;color:#315bc0;border-radius:8px;padding:9px 14px;font-size:12px;font-weight:600;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.account-button:hover{background:#e1ebff}
.account-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:15px}
.account-heading h2{margin-bottom:10px;font-size:20px}
.account-heading>button{font-size:23px;color:#8c99ae;padding:0 3px}
#auth-dialog,#account-dialog,#merge-dialog{width:440px}
#auth-form,#password-form{display:grid;grid-template-columns:minmax(0,1fr);justify-content:stretch;width:100%;gap:9px;margin:17px 0 10px}
#auth-form input,#password-form input{width:100%;border:1px solid #dce4f0;border-radius:8px;padding:12px;font-size:13px;color:#324967;background:white}
#auth-form label,#password-form label{font-size:12px;color:#687c99}
#auth-form .primary{width:100%;margin-top:2px}
#confirm-password-wrap label{display:block;margin-bottom:9px}
.form-error{color:#b75151!important;font-size:12px;min-height:18px;margin:0;line-height:1.7}
.account-actions{display:flex;gap:9px;flex-wrap:wrap;margin:17px 0 12px}
#account-dialog details{border-top:1px solid #e5ebf4;padding-top:16px;margin:17px 0}
#account-dialog summary{font-size:12px;cursor:pointer;color:#6f83a2}
#logout{color:#ac6c62;margin-top:14px}
@media(max-width:760px){.topbar-right{gap:7px}.topbar-right #today-label{display:none}.account-button{max-width:130px;font-size:11px;padding:8px 10px}#sync-status{font-size:9px}.topbar{min-height:56px}}
@media(max-width:760px){
  nav{overflow:visible;gap:2px}
  .nav-button{flex:1;justify-content:center;padding:13px 3px;font-size:10px;gap:4px}
  .nav-button>span{display:none}
  .nav-button b{margin-left:0}
}