:root{--ink:#18344d;--muted:#657789;--blue:#315cdb;--line:#dce4ec;--paper:#fff;--bg:#f3f6fa;--yellow:#efc862;--green:#17775f;--red:#af4b42;--radius:18px;font-family:Inter,"Microsoft YaHei","PingFang SC",system-ui,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none;font-size:16px;line-height:1.65}
*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button:disabled{opacity:.55;cursor:wait}button:focus-visible,a:focus-visible{outline:3px solid #89a4ff;outline-offset:3px}button{border:0;background:none;color:inherit}h1,h2,h3,p{margin:0}h1{font-size:2rem;letter-spacing:-.04em;line-height:1.4}h2{font-size:1.25rem}h3{font-size:1.05rem}small,.muted{color:var(--muted)}small{font-size:.875rem}.shell{display:grid;grid-template-columns:230px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:var(--ink);color:#fff;padding:30px 18px;display:flex;flex-direction:column}.brand{display:flex;gap:12px;align-items:center;padding:0 12px 36px}.brand img{width:43px;height:43px}.brand strong{font-size:1.5rem;letter-spacing:.14em}.brand small{display:block;color:#b6c8d7;font-size:.75rem;letter-spacing:.1em}.nav{display:grid;gap:7px}.nav button{text-align:left;display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:11px;color:#c7d7e5;font-size:.9375rem}.nav button:hover{background:#25435d;color:#fff}.nav button.active{background:#fff;color:var(--ink);font-weight:700}.nav svg{width:20px;height:20px}.sidebar-footer{margin-top:auto;padding:24px 12px 0;display:grid;gap:12px}.avatar{width:38px;height:38px;background:var(--yellow);color:var(--ink);border-radius:12px;display:grid;place-items:center;font-weight:700}.profile{display:flex;gap:10px;align-items:center}.profile small{color:#bacbda}.sidebar-footer .link{color:#d5e3ee;font-size:.875rem;text-align:left;padding:3px 0}.main{min-width:0;padding:30px 44px 50px;max-width:1650px;width:100%;margin:auto}.topline{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:28px;color:var(--muted);font-size:.875rem}.topline .dot{height:7px;width:7px;background:#4b987c;border-radius:100%;display:inline-block;margin-right:7px}.page-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:26px}.page-head p{color:var(--muted);margin-top:7px}.actions{display:flex;align-items:center;gap:9px;flex-wrap:wrap}.btn{padding:10px 17px;border-radius:10px;display:inline-flex;gap:8px;align-items:center;justify-content:center;min-height:44px;font-size:.9375rem;font-weight:600;background:var(--paper);border:1px solid var(--line);white-space:normal}.btn:hover{background:#edf2f9;text-decoration:none}.btn.primary{background:var(--blue);color:#fff;border-color:var(--blue)}.btn.primary:hover{background:#274ebf}.btn.dark{background:var(--ink);color:#fff;border-color:var(--ink)}.btn.ghost{background:transparent;border-color:transparent}.btn.danger{color:var(--red);border-color:#e4bbb6;background:#fff8f7}.btn.sm{min-height:36px;padding:6px 11px;font-size:.875rem}.btn svg{width:18px;height:18px;flex-shrink:0}.banner{background:var(--ink);color:#fff;padding:27px 30px;border-radius:var(--radius);display:flex;justify-content:space-between;align-items:center;gap:30px;margin-bottom:24px;position:relative;overflow:hidden}.banner p{color:#c8d8e6;margin-top:8px;max-width:600px}.banner h2{font-size:1.5rem}.banner .eyebrow{font-size:.8125rem;color:var(--yellow);letter-spacing:.12em;margin-bottom:8px}.budget{border-left:1px solid #456077;padding-left:32px;min-width:156px}.budget strong{font-size:2.5rem;font-weight:600;letter-spacing:-.05em;line-height:1.2}.budget small{display:block;color:#c8d8e6}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:26px}.metric{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px}.metric .label{font-size:.875rem;color:var(--muted);display:flex;justify-content:space-between;align-items:center}.metric strong{font-size:2rem;display:block;margin-top:4px;letter-spacing:-.06em}.metric small{display:block;font-size:.8125rem}.grid2{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(290px,1fr);gap:22px}.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:23px;margin-bottom:22px}.panel-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:17px;gap:12px}.panel-head a,.panel-head button{font-size:.875rem}.section-head{margin:28px 0 14px;display:flex;justify-content:space-between;align-items:center}.stack{display:grid;gap:14px}.row{display:flex;gap:14px;align-items:center;padding:14px 0;border-top:1px solid #eef1f5}.row:first-child{border-top:0}.row .grow{flex:1;min-width:0}.row p{white-space:pre-wrap;overflow-wrap:anywhere}.row small{display:block}.row .actions{justify-content:flex-end}.subject{font-size:.8125rem;padding:3px 10px;border-radius:6px;display:inline-block;white-space:nowrap;font-weight:600}.subject.数学{background:#e1f3ed;color:#196b55}.subject.语文{background:#ffede6;color:#a25931}.subject.英语{background:#eee8ff;color:#7350ad}.badge{font-size:.8125rem;padding:3px 9px;border-radius:6px;background:#edf2f8;color:#587086;display:inline-block;white-space:nowrap}.badge.warn{background:#fff4d8;color:#8b681f}.badge.ok{background:#e0f2e9;color:#277351}.badge.bad{background:#fce6e3;color:#a54b42}.empty{padding:36px 20px;text-align:center;background:#f8fafc;border-radius:12px;border:1px dashed var(--line)}.empty svg{width:32px;height:32px;color:#8da1b5;margin-bottom:12px}.empty h3{margin-bottom:5px}.empty p{color:var(--muted);font-size:.9375rem;max-width:470px;margin:0 auto 16px}.subject-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.subject-card{padding:22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}.subject-card strong{display:block;font-size:1.7rem;margin:12px 0 2px}.subject-card .track{height:6px;border-radius:6px;background:#edf1f7;margin-top:16px;overflow:hidden}.subject-card .track span{height:100%;display:block;background:var(--blue)}.filters{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:20px}.filter{padding:7px 17px;border-radius:99px;border:1px solid var(--line);background:#fff;font-size:.875rem}.filter.active{background:var(--ink);color:#fff;border-color:var(--ink)}.search{margin-left:auto;max-width:300px}.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:18px}.book{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.book-cover{padding:26px 25px 22px;background:#e6edf7;border-bottom:1px solid var(--line);min-height:145px;display:flex;justify-content:space-between;gap:16px}.book-cover h3{font-size:1.25rem;margin:12px 0 3px}.book-cover .book-mark{border-left:3px solid #8aa2c5;padding-left:13px;display:flex;align-items:center}.book-body{padding:18px 22px}.book-body .actions{margin-top:16px}.question-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}.question-card.selected{border-color:var(--blue);box-shadow:0 0 0 1px var(--blue)}.q-top{display:flex;align-items:center;gap:10px;margin-bottom:14px}.q-top .right{margin-left:auto}.question-card .prompt{font-size:1rem;white-space:pre-wrap;margin:12px 0;overflow-wrap:anywhere}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:14px 0}.answer-box{padding:12px 15px;border-radius:10px;background:#f3f6fa;white-space:pre-wrap;overflow-wrap:anywhere}.answer-box small{display:block;margin-bottom:5px}.question-card .foot{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding-top:12px;border-top:1px solid var(--line)}.context{background:#f7f9fc;border-left:3px solid #bacbe0;padding:12px 15px;margin-top:12px;font-size:.9375rem;white-space:pre-wrap;max-height:220px;overflow:auto}.notice{padding:12px 16px;border-radius:10px;background:#fff6df;color:#7b6128;font-size:.875rem;margin-bottom:18px}.notice.info{background:#eaf0ff;color:#385992}.notice.error{background:#fcece9;color:#a0473b}.timeline{border-left:2px solid var(--line);margin:12px 0 12px 8px;padding-left:18px}.timeline>div{padding:8px 0}.timeline p{white-space:pre-wrap}.analysis-block p{margin:7px 0 15px;white-space:pre-wrap}.analysis-block .evidence{display:flex;gap:7px;flex-wrap:wrap}.check{width:18px;height:18px;accent-color:var(--blue);flex-shrink:0}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;text-align:left;font-size:.9375rem}th{font-weight:500;color:var(--muted);padding:11px 12px;background:#f6f8fb;font-size:.875rem}td{padding:15px 12px;border-bottom:1px solid var(--line)}label{display:grid;gap:7px;font-size:.9375rem}input,textarea,select{width:100%;border:1px solid #cdd8e4;border-radius:9px;padding:10px 12px;color:var(--ink);background:#fff;min-height:44px}input[type=checkbox]{width:18px;min-height:18px}textarea{min-height:100px;resize:vertical}input:focus,textarea:focus,select:focus{outline:2px solid #9bb2f6;outline-offset:1px}form{display:grid;gap:16px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.form-grid .full{grid-column:1/-1}.help{font-size:.8125rem;color:var(--muted)}dialog{border:0;border-radius:20px;padding:0;width:min(740px,calc(100vw - 28px));max-height:90vh;color:var(--ink);box-shadow:0 30px 100px #112e4b33}dialog::backdrop{background:#10273e80;backdrop-filter:blur(3px)}.modal-head{padding:22px 26px 16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.modal-head h2{font-size:1.25rem}.close{width:38px;height:38px;border-radius:99px;background:#f0f3f7;font-size:1.5rem;line-height:1}.modal-body{padding:23px 26px;max-height:calc(90vh - 84px);overflow:auto}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:8px}.reader{background:#e4eaf1;padding:16px;text-align:center;border-radius:12px}.reader img{max-width:100%;height:auto;background:#fff;box-shadow:0 4px 15px #1d33441a}.reader-controls{display:flex;gap:12px;justify-content:center;align-items:center;margin-bottom:15px}.reader-controls input{width:90px}.login-wrap{min-height:100vh;display:grid;grid-template-columns:1fr 1.05fr;background:#fff}.login-intro{background:var(--ink);color:#fff;padding:9vw 7vw;display:flex;flex-direction:column;justify-content:center}.login-intro .brand{padding:0 0 50px}.login-intro h1{font-size:2.9rem;max-width:430px;line-height:1.6;letter-spacing:0}.login-intro h1 span{color:var(--yellow)}.login-intro p{color:#c3d4e2;margin-top:24px;max-width:370px}.login-steps{display:flex;gap:14px;margin-top:50px;flex-wrap:wrap}.login-steps span{border:1px solid #4b667c;border-radius:99px;padding:7px 14px;font-size:.875rem}.login-main{padding:55px 7vw;display:flex;flex-direction:column;justify-content:center}.login-main>div{max-width:460px;width:100%;margin:auto}.login-main h2{font-size:1.65rem;margin-bottom:10px}.login-main p{color:var(--muted);margin-bottom:26px}.login-main form{gap:20px}.login-main footer{font-size:.8125rem;color:var(--muted);margin-top:28px}.child .sidebar{background:#1d4960}.child .main{max-width:1250px}.child .banner{background:#dfebf8;color:var(--ink);border:1px solid #c6d8ef}.child .banner p,.child .banner small{color:#536c84}.child .banner .eyebrow{color:#516d8b}.child .budget{border-color:#b4cce4}.child .task-number{background:#edf2fc;color:var(--blue);width:44px;height:44px;border-radius:13px;display:grid;place-items:center;font-size:1.2rem;font-weight:700;flex-shrink:0}.flashcard{text-align:center;padding:25px 15px}.flashcard .front{font-size:1.6rem;line-height:1.8;white-space:pre-wrap;padding:30px 0}.flashcard .back{font-size:1.4rem;color:var(--green);white-space:pre-wrap;padding:22px;background:#edf7f2;border-radius:14px;margin:15px 0}.flashcard .actions{justify-content:center}.loading{padding:60px;color:var(--muted);text-align:center}.error-text{color:var(--red);background:#fff0ed;padding:10px 14px;border-radius:9px;font-size:.875rem}.print-only{display:none}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);z-index:9999;border-radius:12px;background:var(--ink);color:white;padding:12px 22px;box-shadow:0 8px 35px #18344d33;max-width:90vw;display:none;font-size:.9375rem}#toast.show{display:block}.mobile-brand{display:none}.subtle-link{color:var(--muted);text-decoration:underline;cursor:pointer}.nowrap{white-space:nowrap}
svg{width:20px;height:20px;flex-shrink:0}.book-mark svg{width:34px;height:34px}.metric .label svg{width:19px;height:19px;color:#8ca1b5}
@media(min-width:1500px){.main{padding:38px 60px}.metrics{gap:22px}}
@media(max-width:1100px){.shell{grid-template-columns:190px minmax(0,1fr)}.main{padding:26px}.sidebar{padding:26px 10px}.grid2{grid-template-columns:1fr}.metrics{grid-template-columns:repeat(2,1fr)}.page-head{align-items:flex-start}.page-head .actions{justify-content:flex-end}.subject-cards{gap:10px}.subject-card{padding:17px}}
@media(max-width:720px){.shell{display:block}.sidebar{height:auto;position:relative;padding:14px 16px 10px}.sidebar .brand{padding:0 0 12px}.brand img{width:32px;height:32px}.brand strong{font-size:1.2rem}.brand small{display:none}.nav{display:flex;overflow-x:auto;gap:6px;padding-bottom:5px}.nav button{flex-shrink:0;padding:8px 12px;font-size:.875rem;gap:6px}.nav svg{width:17px}.sidebar-footer{position:absolute;top:12px;right:16px;margin:0;padding:0;display:flex;gap:16px}.sidebar-footer .profile{display:none}.sidebar-footer .link{font-size:.8125rem}.main{padding:20px 16px 40px}.topline{margin-bottom:19px;font-size:.8125rem}.page-head{display:block;margin-bottom:20px}h1{font-size:1.65rem}.page-head .actions{justify-content:flex-start;margin-top:14px}.banner{padding:22px;gap:15px}.banner h2{font-size:1.22rem}.banner p{font-size:.875rem}.budget{padding-left:17px;min-width:90px}.budget strong{font-size:2rem}.metrics{gap:10px}.metric{padding:16px}.metric strong{font-size:1.7rem}.metric small{font-size:.75rem}.panel{padding:18px}.subject-cards{grid-template-columns:1fr}.subject-card{display:grid;grid-template-columns:1fr auto;gap:5px;align-items:center}.subject-card strong{margin:0;font-size:1.4rem}.subject-card .track{grid-column:1/-1;margin:6px 0}.row{flex-wrap:wrap;gap:10px}.row .actions{width:100%;justify-content:flex-start}.form-grid,.answer-grid{grid-template-columns:1fr}.form-grid .full{grid-column:auto}.search{margin-left:0;max-width:none;width:100%}.question-card{padding:17px}.q-top{flex-wrap:wrap}.q-top .right{margin-left:0}.modal-body{padding:18px}.modal-head{padding:17px 18px}.login-wrap{display:block}.login-intro{padding:27px}.login-intro .brand{padding:0 0 20px}.login-intro h1{font-size:1.6rem}.login-intro p,.login-steps{display:none}.login-main{padding:30px 24px}.login-main h2{font-size:1.4rem}.flashcard .front{font-size:1.3rem}}
@media print{body{background:white}.shell,.login-wrap,#toast{display:none!important}dialog{position:static;display:block!important;max-height:none;width:100%;max-width:none;box-shadow:none;border-radius:0;margin:0;padding:0}.modal-head,.modal-actions,.no-print,.reader-controls{display:none!important}.modal-body{max-height:none;overflow:visible;padding:0}.print-only{display:block}.answer-reveal{display:none!important}.paper-question{page-break-inside:avoid;padding-bottom:140px}.paper-question .prompt{white-space:pre-wrap;font-size:18px}.paper-question h2{margin-bottom:20px}dialog::backdrop{display:none}}