@charset "UTF-8";
:root{--blue:#2869df;--ink:#20304b;--muted:#7b879b;--line:#e9edf4;--bg:#f5f7fb;--green:#269d7e;--font:"Microsoft YaHei","PingFang SC",sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);font:14px/1.7 var(--font);color:var(--ink)}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-offset:4px}button{cursor:pointer;border:0}a{color:var(--blue);text-decoration:none}button:disabled{opacity:.55;cursor:wait}button,.btn{border-radius:10px;padding:10px 18px;font-weight:600;transition:.18s}button:hover{filter:brightness(.97);transform:translateY(-1px)}.primary{background:var(--blue);color:white}.secondary{background:#edf3ff;color:var(--blue)}.quiet{background:white;border:1px solid var(--line);color:var(--ink)}.danger{background:#fff0f0;color:#c55555}.small{padding:6px 12px;font-size:12px}.icon{width:21px;height:21px;vertical-align:middle;flex-shrink:0;stroke:currentColor;fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.shell{display:grid;grid-template-columns:234px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:#fff;border-right:1px solid var(--line);padding:30px 18px;display:flex;flex-direction:column}.brand{display:flex;gap:11px;align-items:center;padding:0 12px 27px}.brandmark{width:43px;height:43px;background:var(--blue);border-radius:14px;display:grid;place-items:center;color:white;box-shadow:0 5px 12px #2869df25}.brandmark .icon{width:26px;height:26px}.brand strong{font-size:18px;letter-spacing:1px}.brand small{display:block;font-size:10px;letter-spacing:1.5px;color:var(--muted)}.school-label{font-size:11px;color:var(--muted);margin:8px 14px 13px;letter-spacing:1px}.nav{display:flex;flex-direction:column;gap:8px}.nav button{background:transparent;text-align:left;display:flex;align-items:center;gap:13px;color:#68758c;padding:12px 16px;font-weight:500}.nav button.active{background:#edf3ff;color:var(--blue);font-weight:700}.nav button.active:after{content:"";margin-left:auto;width:5px;height:5px;background:var(--blue);border-radius:50%}.side-bottom{margin-top:auto;padding:18px 12px 0}.side-tip{background:#f4f8ff;border-radius:14px;padding:15px;font-size:12px;color:#7789a6}.side-tip strong{display:block;color:#526a93;margin-bottom:5px}.version{color:#a2abba;font-size:10px;text-align:center;margin-top:18px}.topbar{height:85px;border-bottom:1px solid var(--line);background:#ffffffc9;padding:0 38px;display:flex;justify-content:space-between;align-items:center}.breadcrumb{font-size:12px;color:var(--muted)}.breadcrumb b{color:var(--ink);font-weight:500}.top-user{display:flex;align-items:center;gap:12px}.avatar{width:36px;height:36px;border-radius:50%;background:#e9f1ff;color:var(--blue);display:grid;place-items:center;font-weight:700}.top-user small{font-size:11px;color:var(--muted)}.top-user .quiet{padding:5px 10px;font-size:11px}main{max-width:1390px;padding:32px 38px 28px;margin:auto}.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:25px;gap:15px}.eyebrow{font-size:10px;letter-spacing:2px;color:var(--blue);font-weight:700;margin-bottom:5px}h1{font-size:26px;line-height:1.4;margin:0;font-weight:700;letter-spacing:.4px}h2{font-size:18px;margin:0 0 5px}h3{font-size:15px;margin:0 0 6px}p{margin:6px 0}.muted{color:var(--muted)}.caption{font-size:12px;color:var(--muted)}.hero{position:relative;border:1px solid #dbe9f8;border-radius:22px;background:linear-gradient(110deg,#e9f3ff,#edf9f6);padding:32px 36px;min-height:225px;overflow:hidden;margin-bottom:26px}.hero-content{position:relative;z-index:1;max-width:65%}.hero h1{font-size:30px;margin:13px 0 10px}.hero p{color:#6e88a3}.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:20px;background:#fff9;font-size:11px;color:#578394}.hero-art{position:absolute;right:15px;bottom:0;width:285px;height:230px}.grid{display:grid;gap:19px}.grid3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid4{grid-template-columns:repeat(4,minmax(0,1fr))}.grid2{grid-template-columns:repeat(2,minmax(0,1fr))}.feature{border:1px solid var(--line);background:#fff;border-radius:17px;padding:24px;position:relative;cursor:pointer;transition:.2s;min-height:170px}.feature:hover{transform:translateY(-4px);box-shadow:0 12px 25px #29467409}.feature-icon{width:48px;height:48px;border-radius:15px;display:grid;place-items:center;margin-bottom:17px;background:#eaf2ff;color:#3977df}.feature-icon .icon{width:26px;height:26px}.feature.green .feature-icon{background:#e8f7f0;color:#239b79}.feature.purple .feature-icon{background:#f0ecff;color:#8771ce}.feature-arrow{position:absolute;right:22px;bottom:24px;color:#b3c1d5}.section-head{display:flex;justify-content:space-between;align-items:center;margin:29px 0 16px}.section-head h2{font-size:17px}.card{background:white;border:1px solid var(--line);border-radius:17px;padding:23px}.card.soft{background:#f8fbff}.class-banner{display:flex;gap:22px;align-items:center}.class-visual{background:linear-gradient(130deg,#dff0da,#eef7d8);width:116px;height:106px;border-radius:13px;display:grid;place-items:center;color:#5b9d5d;flex-shrink:0}.class-visual .icon{width:48px;height:48px}.badge{font-size:10px;border-radius:6px;padding:3px 8px;background:#eef3fb;color:#627eaa;display:inline-block}.badge.green{background:#e8f7ef;color:#33966e}.badge.orange{background:#fff4e3;color:#ba8a3b}.badge.purple{background:#f0ebff;color:#8b6ac1}.flex{display:flex;align-items:center;gap:10px}.between{justify-content:space-between}.wrap{flex-wrap:wrap}.grow{flex:1}.spacer{height:15px}.notice{padding:12px 16px;border-radius:10px;background:#fff8e9;color:#9c7b39;font-size:12px;margin-bottom:18px}.notice.blue{background:#edf4ff;color:#607ca5}.progress{height:6px;border-radius:9px;background:#eaf0f7;overflow:hidden;margin:12px 0}.progress span{height:100%;display:block;background:#5fbca1;border-radius:9px}.footer{margin-top:36px;text-align:center;font-size:11px;color:#a5aebe}.stat{padding:20px}.stat strong{display:block;font-size:26px;line-height:1.5}.stat span{font-size:12px;color:var(--muted)}.empty{text-align:center;color:var(--muted);padding:45px 15px}.empty .icon{width:38px;height:38px;display:block;margin:0 auto 15px;color:#a7bbd7}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.tabs button{background:transparent;color:var(--muted);font-size:12px;padding:7px 15px}.tabs button.active{background:var(--blue);color:white}.work-card{position:relative;min-height:210px;cursor:pointer}.work-card h3{font-size:17px;margin-top:12px}.work-card .excerpt{color:#8390a3;font-size:12px;margin:10px 0 22px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;white-space:pre-wrap}.work-card .bottom{display:flex;justify-content:space-between;align-items:center}.work-card .date{font-size:10px;color:#a1adbd}.work-card .work-decor{position:absolute;right:22px;top:22px;color:#d8e1ef}.work-card .work-decor .icon{width:23px;height:23px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:12px;white-space:nowrap}th{text-align:left;background:#f7f9fc;color:#8591a4;font-weight:500}td,th{padding:14px 16px;border-bottom:1px solid var(--line)}tbody tr:last-child td{border-bottom:0}.form-grid{display:grid;gap:19px;grid-template-columns:repeat(2,minmax(0,1fr))}label{display:block;font-size:12px;font-weight:600;color:#596a85;margin-bottom:15px}input:not([type=checkbox]),textarea,select{width:100%;display:block;border:1px solid #dfe6f0;border-radius:9px;padding:10px 12px;background:#fff;color:var(--ink);margin-top:6px;font-weight:400}textarea{resize:vertical;min-height:100px}input:focus,textarea:focus,select:focus{border-color:#81a9e7;outline:2px solid #dceaff}label:has(input[type=checkbox]){display:flex;align-items:center;gap:9px;font-weight:400}input[type=checkbox]{accent-color:var(--blue);width:16px;height:16px}.form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:22px}.full{grid-column:1/-1}.chat-layout{display:grid;grid-template-columns:205px minmax(0,1fr);background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;height:calc(100vh - 250px);min-height:540px}.chat-history{background:#fafbfe;border-right:1px solid var(--line);padding:18px 13px;overflow:auto}.chat-history button{width:100%;text-align:left;padding:10px;font-size:12px;font-weight:400;background:transparent;margin-bottom:6px;color:#72819a;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-history button.selected{background:#eaf1fc;color:var(--blue)}.chat-main{display:flex;flex-direction:column;min-width:0}.chat-top{padding:18px 24px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}.chat-messages{flex:1;overflow:auto;padding:25px}.chat-welcome{text-align:center;margin:40px auto 15px;max-width:500px}.chat-welcome .feature-icon{margin:0 auto 20px;width:65px;height:65px;border-radius:22px}.chips{display:flex;justify-content:center;flex-wrap:wrap;gap:9px;margin-top:24px}.chips button{background:#f6f9ff;color:#7183a1;font-size:12px;font-weight:400;border:1px solid #e7eef9}.message{display:flex;align-items:flex-start;gap:10px;margin-bottom:20px}.message .bubble{background:#f4f7fc;border:1px solid #eaf0f8;border-radius:4px 15px 15px;padding:13px 17px;max-width:86%;white-space:pre-wrap;font-size:13px;overflow-wrap:anywhere}.message.user{justify-content:flex-end}.message.user .bubble{background:#edf4ff;color:#456ca8;border-color:#dce9fe;border-radius:15px 4px 15px 15px}.message .avatar{width:29px;height:29px;font-size:10px;flex-shrink:0}.composer{padding:16px 22px;border-top:1px solid var(--line)}.compose-box{border:1px solid #dce4f1;border-radius:13px;padding:10px;display:flex;gap:10px;align-items:flex-end}.compose-box textarea{border:0;background:transparent;margin:0;min-height:45px;height:55px;resize:none;outline:none}.composer-foot{display:flex;justify-content:space-between;margin-top:8px;font-size:10px;color:#99a6bb}.composer-foot button{padding:0;background:none;color:#7896c3;font-size:10px}.writing-layout{display:grid;grid-template-columns:290px minmax(0,1fr);gap:20px}.paper{background:linear-gradient(#fffefa,#fff);border:1px solid #eee9dc;border-radius:16px;min-height:400px;padding:35px}.paper textarea{border:0;min-height:310px;background:transparent;line-height:2;font-size:16px;outline:none}.work-detail{white-space:pre-wrap;font-size:15px;line-height:2;padding:15px 0}.detail-meta{border-top:1px solid var(--line);padding-top:16px;margin-top:20px}.detail-meta p{font-size:12px;color:#7788a1}.review-layout{display:grid;grid-template-columns:300px minmax(0,1fr);gap:20px}.review-list button{width:100%;background:#fff;border:1px solid var(--line);text-align:left;margin-bottom:9px}.review-list button.selected{background:#edf4ff;border-color:#9ebfee}.review-list small{display:block;color:var(--muted);font-weight:400}.login{min-height:100vh;display:grid;grid-template-columns:1.1fr 1fr;background:#fff}.login-intro{background:linear-gradient(145deg,#eef5ff,#eaf6f0);padding:65px 12%;display:flex;flex-direction:column;justify-content:center;position:relative;overflow:hidden}.login-intro h1{font-size:40px;line-height:1.7;margin:30px 0 15px}.login-intro p{color:#7f92a9}.login-intro .hero-art{position:relative;width:310px;height:240px;margin-top:20px;right:auto}.login-form{display:flex;align-items:center;justify-content:center;padding:35px}.login-box{width:360px}.login-box h2{font-size:24px}.login-box .primary{width:100%}.demo-logins{border-top:1px solid var(--line);margin-top:25px;padding-top:18px}.demo-logins button{font-size:11px;padding:7px 11px;background:#f3f6fb;color:#72829a;margin:5px 4px 0 0}.login-note{font-size:10px;color:#a5aebe;margin-top:22px}dialog{border:1px solid var(--line);border-radius:18px;padding:27px;width:min(640px,92vw);max-height:90vh;box-shadow:0 30px 100px #1b31552b;color:var(--ink)}dialog::backdrop{background:#17273f65;backdrop-filter:blur(3px)}dialog h2{margin-bottom:20px}dialog .close{float:right;background:#f1f4f9;padding:3px 10px;color:#8290a5}.dialog-body{max-height:65vh;overflow:auto}.error-inline{color:#bd5858;background:#fff3f3;padding:9px 12px;border-radius:8px;font-size:12px;margin-top:12px}#toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%);background:#253952;color:#fff;padding:12px 22px;border-radius:12px;z-index:100;opacity:0;pointer-events:none;transition:.2s;max-width:90vw}#toast.show{opacity:1}.boot{padding:30vh 20px;text-align:center;color:var(--muted)}.mobile-menu{display:none}.row-actions{display:flex;gap:8px}.image-result{width:100%;border-radius:13px;display:block;margin:10px 0}.queue-row{border:1px solid var(--line);padding:15px;border-radius:12px;margin:12px 0}.queue-row p{font-size:12px}.lesson-selected{padding:7px 12px;border-radius:9px;background:#edf6ff;color:#6386b6;font-size:11px}.split-content{display:grid;grid-template-columns:1.7fr 1fr;gap:20px}.metric-unit{font-size:11px;color:#9aa7bb}.invite-box{background:#edf5ff;padding:15px;overflow-wrap:anywhere;border-radius:9px;font-size:12px}button:focus-visible{outline:3px solid #a3c1f4}.loading{opacity:.5;pointer-events:none}
@media(min-width:1500px){main{padding-top:38px}.hero{min-height:245px}.hero-art{right:70px;width:330px}}
@media(max-width:1100px){.shell{grid-template-columns:195px minmax(0,1fr)}.sidebar{padding:25px 12px}.brand{padding-left:5px;gap:7px}.brand strong{font-size:15px}.topbar{padding:0 25px}main{padding:25px}.grid4{grid-template-columns:repeat(2,minmax(0,1fr))}.hero-art{right:-30px;opacity:.8}.hero-content{max-width:70%}.writing-layout{grid-template-columns:235px minmax(0,1fr)}}
@media(max-width:760px){.shell{display:block}.sidebar{position:fixed;left:-240px;width:234px;z-index:20;transition:.2s;box-shadow:10px 0 60px #20304b1a}.sidebar.open{left:0}.mobile-menu{display:block;background:transparent;padding:5px}.topbar{height:65px;padding:0 16px}.breadcrumb{display:none}main{padding:20px 16px}.page-head{align-items:flex-start}h1{font-size:23px}.hero{padding:23px;min-height:225px}.hero h1{font-size:25px}.hero-content{max-width:85%}.hero-art{width:170px;height:160px;opacity:.35;right:-10px}.grid3,.grid2,.split-content,.writing-layout,.review-layout{grid-template-columns:1fr}.grid4{gap:10px}.feature{min-height:140px;padding:20px}.feature-icon{margin-bottom:10px}.chat-layout{grid-template-columns:1fr;height:calc(100dvh - 210px);min-height:470px}.chat-history{display:none}.chat-messages{padding:15px}.chat-top{padding:13px}.composer{padding:12px}.compose-box{gap:3px}.compose-box button{padding:9px 12px}.form-grid{grid-template-columns:1fr}.class-banner{gap:12px;flex-wrap:wrap}.class-visual{width:70px;height:80px}.class-banner .primary{margin-left:auto}.login{grid-template-columns:1fr}.login-intro{padding:25px}.login-intro h1,.login-intro p,.login-intro .hero-art{display:none}.login-intro .brand{padding:0}.login-form{padding:35px 25px}.footer{font-size:10px}.top-user .user-name{display:none}.paper{padding:20px}.top-user{gap:8px}}