:root{--ink:#172927;--green:#173e3d;--green2:#2b716d;--orange:#d86f3d;--bg:#f3f6f5;--line:#dce6e3;--muted:#6c7d79;--white:#fff;--danger:#b44236;font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg)}button,input,select{font:inherit}button{cursor:pointer}.hidden{display:none!important}.eyebrow{font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--green2)}.toast{position:fixed;z-index:100;left:50%;top:18px;transform:translate(-50%,-20px);opacity:0;pointer-events:none;background:#173e3d;color:#fff;padding:11px 18px;border-radius:12px;box-shadow:0 12px 35px #173e3d33;transition:.25s;font-size:14px}.toast.show{opacity:1;transform:translate(-50%,0)}.toast.error{background:#9a352d}.auth-shell{min-height:100vh;display:grid;grid-template-columns:minmax(320px,.9fr) minmax(420px,1.1fr)}.auth-brand{background:var(--green);color:#fff;padding:clamp(40px,7vw,90px);display:flex;flex-direction:column;justify-content:center;position:relative;overflow:hidden}.auth-brand:after{content:"";position:absolute;width:420px;height:420px;border:1px solid #ffffff1f;border-radius:50%;right:-180px;bottom:-170px;box-shadow:0 0 0 70px #ffffff08,0 0 0 140px #ffffff06}.brand-mark{display:grid;place-items:center;width:54px;height:54px;border-radius:17px;background:#fff;color:var(--green);font-size:25px;font-weight:900;margin-bottom:18px}.auth-brand p{color:#bcd1cd;margin:0 0 42px}.auth-brand h1{font-size:clamp(38px,5vw,66px);line-height:1.18;letter-spacing:-.04em;margin:0;max-width:600px}.privacy-note{margin-top:60px;border:1px solid #ffffff26;background:#ffffff0c;width:max-content;max-width:100%;padding:10px 14px;border-radius:10px;color:#cfe0dd;font-size:13px}.auth-panel{display:grid;place-items:center;padding:28px}.auth-card{width:min(100%,420px);background:#fff;padding:38px;border-radius:24px;box-shadow:0 22px 65px #183b3520}.auth-card h2{font-size:30px;margin:8px 0}.auth-card>p{color:var(--muted);margin:0 0 28px;line-height:1.7}.auth-card label,.form-grid label,#password-form>label{display:grid;gap:8px;font-size:14px;font-weight:700;margin-bottom:17px}.auth-card input,.form-grid input,.form-grid select,#password-form input,.scan-options select{height:44px;border:1px solid #cfdcda;border-radius:10px;padding:0 12px;background:#fff;color:var(--ink);outline:none}.auth-card input:focus,.form-grid input:focus,.form-grid select:focus,.scan-options select:focus{border-color:var(--green2);box-shadow:0 0 0 3px #2b716d20}.primary,.orange,.secondary,.ghost{border:0;border-radius:11px;height:44px;padding:0 18px;font-weight:750}.primary{background:var(--green);color:#fff}.primary:hover{background:#285654}.auth-card .primary{width:100%;margin-top:5px}.secondary{background:#edf2f1;color:#40534f}.ghost{background:transparent;color:#5d706c}.orange{background:var(--orange);color:#fff}.secure-tip{text-align:center;color:#758480;font-size:12px;margin-top:18px}.topbar{height:66px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 26px;position:sticky;top:0;z-index:20}.logo{display:flex;align-items:center;gap:10px}.logo>span{display:grid;place-items:center;width:38px;height:38px;background:var(--green);color:#fff;border-radius:12px;font-weight:900}.logo div{display:grid}.logo b{font-size:17px}.logo small{color:#758480}.top-actions{display:flex;align-items:center;gap:8px}.server-badge{background:#e8f4f1;color:#286760;border-radius:100px;padding:7px 11px;font-size:12px;font-weight:700}.shell{display:grid;grid-template-columns:210px minmax(0,1fr);max-width:1580px;margin:auto}.sidebar{min-height:calc(100vh - 66px);border-right:1px solid var(--line);background:#f8faf9;padding:18px 14px;display:flex;flex-direction:column}.sidebar nav{display:grid;gap:6px}.nav{border:0;background:transparent;text-align:left;padding:12px 13px;border-radius:11px;color:#60736f;font-weight:700;font-size:14px}.nav.active{background:#dfefeb;color:#1e615b}.side-foot{margin-top:auto;border-top:1px solid var(--line);padding:17px 10px 4px;display:grid;gap:4px}.side-foot small,.side-foot span{font-size:12px;color:#7b8b87}.content{min-width:0;padding:30px 34px 50px}.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px}.page-head h1{font-size:30px;margin:7px 0 4px;letter-spacing:-.02em}.page-head p{margin:0;color:var(--muted);font-size:14px}.compact{height:40px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:20px}.stats article{background:#fff;border:1px solid #e5ecea;border-radius:16px;padding:18px 20px;display:grid;gap:8px;box-shadow:0 6px 24px #1d403a0b}.stats span,.stats small{font-size:12px;color:#758480}.stats strong{font-size:27px}.work-grid{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,.75fr);gap:20px}.card{background:#fff;border-radius:18px;box-shadow:0 8px 30px #213e3a12;overflow:hidden}.card-head{display:flex;align-items:center;justify-content:space-between;padding:18px 21px;border-bottom:1px solid #e7eeec}.card-head h2{font-size:16px;margin:0 0 5px}.card-head p{margin:0;color:#788783;font-size:12px}.chip{background:#e3f1ee;color:#1e6a63;font-size:12px;font-weight:750;border-radius:100px;padding:6px 9px}.scan-body{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:18px;padding:20px}.file-drop{min-height:255px;border:2px dashed #b8cbc7;border-radius:16px;background:#f7faf9;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:9px;color:var(--ink)}.file-drop:hover{border-color:var(--green2);background:#eff7f5}.file-drop small{color:#7b8b87}.upload-icon{display:grid;place-items:center;width:54px;height:54px;border-radius:16px;background:#deeeea;color:var(--green2);font-size:28px}.scan-options{background:#f5f7f6;border-radius:15px;padding:15px;display:flex;flex-direction:column;gap:13px}.scan-options label{display:grid;gap:7px;font-size:13px;font-weight:700}.scan-options select{height:40px}.scope{margin-top:auto;background:#e9f5f1;border:1px solid #cae0da;color:#28645f;border-radius:11px;padding:10px;font-size:12px;line-height:1.55}.student-list{padding:7px 20px 18px;min-height:284px}.student-row{display:grid;grid-template-columns:40px 1fr auto;align-items:center;gap:11px;padding:13px 0;border-bottom:1px solid #edf1f0}.avatar{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--green2);color:#fff;font-weight:800}.student-row b{font-size:14px}.student-row small{display:block;margin-top:3px;color:#788783}.student-row span{font-size:12px;color:#2b716d;background:#edf6f3;padding:5px 7px;border-radius:8px}.recent{margin-top:20px}.mistake-list{padding:0 21px;min-height:80px}.mistake-row{display:grid;grid-template-columns:1fr auto auto;gap:15px;padding:15px 0;border-bottom:1px solid #edf1f0;align-items:center}.mistake-row b{font-size:14px}.mistake-row small{color:#7a8986}.score{background:#fff0e7;color:#bd562b;font-weight:800;padding:5px 9px;border-radius:8px}.empty{display:grid;place-items:center;color:#87948f;font-size:13px}.result{padding:20px}.result-top{display:flex;justify-content:space-between;gap:15px;align-items:center;background:#edf7f3;padding:14px;border-radius:14px}.result-top h3{margin:0 0 4px}.result-top p{margin:0;color:#657a76;font-size:13px}.safe{background:#d7eee3;color:#216c4e;border-radius:100px;padding:7px 10px;font-size:12px;font-weight:800}.scope-line{border:1px solid #d7e5e1;border-radius:11px;padding:11px;margin:13px 0;color:#28645f;font-size:13px}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.answer-box{border:1px solid #e3ebe8;padding:14px;border-radius:13px}.answer-box h4{margin:0 0 8px}.answer-box p{font-size:14px;line-height:1.65}.practice{margin-top:12px;padding:14px;border-radius:13px;background:#f6f8f7}.practice h4{margin:0 0 10px}.practice ol{margin:0;padding-left:23px;line-height:1.8;font-size:13px}.result-actions{display:flex;justify-content:flex-end;margin-top:14px}.table-wrap{overflow:auto}.table-wrap table{width:100%;border-collapse:collapse;min-width:720px}.table-wrap th,.table-wrap td{text-align:left;padding:14px 20px;border-bottom:1px solid #eaf0ee;font-size:13px}.table-wrap th{background:#f8faf9;color:#657672;font-size:12px}.status{font-weight:750;color:#2a715f}.status.off{color:#9a5149}.table-action{border:1px solid #d9e4e1;background:#fff;color:#365e5a;border-radius:8px;padding:6px 9px;margin-right:6px}.table-action.danger{color:var(--danger)}dialog{border:0;border-radius:19px;padding:0;width:min(92vw,520px);box-shadow:0 24px 80px #152e2a38}dialog::backdrop{background:#101b1a99;backdrop-filter:blur(3px)}dialog form{padding:22px}dialog header{display:flex;justify-content:space-between;gap:20px;margin-bottom:20px}dialog h2{margin:0 0 6px}dialog header p{margin:0;color:var(--muted);font-size:13px}.dialog-close{border:0;background:transparent;font-size:26px;color:#71817d;height:32px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}.form-grid.one{grid-template-columns:1fr}.form-grid .wide{grid-column:1/-1}dialog footer{display:flex;justify-content:flex-end;gap:9px;margin-top:10px}
@media(max-width:900px){.work-grid{grid-template-columns:1fr}.shell{grid-template-columns:74px minmax(0,1fr)}.sidebar{padding:14px 9px}.nav span,.side-foot{display:none}.nav{text-align:center;font-size:20px}.content{padding:24px 20px}.scan-body{grid-template-columns:1fr 210px}}
@media(max-width:650px){.auth-shell{grid-template-columns:1fr}.auth-brand{min-height:240px;padding:28px}.auth-brand h1{font-size:34px}.auth-brand p{margin-bottom:20px}.privacy-note{margin-top:24px}.auth-panel{padding:18px}.auth-card{padding:26px}.topbar{padding:0 14px}.logo small,.server-badge{display:none}.shell{display:block}.sidebar{min-height:0;position:fixed;bottom:0;left:0;right:0;z-index:30;border:0;border-top:1px solid var(--line);padding:7px 12px;background:#fff}.sidebar nav{grid-template-columns:1fr 1fr}.nav{font-size:14px;text-align:center;padding:10px}.nav span{display:inline}.content{padding:20px 14px 90px}.page-head{align-items:flex-start}.page-head h1{font-size:25px}.stats{grid-template-columns:1fr 1fr}.stats article:last-child{grid-column:1/-1}.scan-body{grid-template-columns:1fr}.file-drop{min-height:190px}.student-list{min-height:0}.mistake-row{grid-template-columns:1fr auto}.mistake-row small{grid-column:1/-1}.answer-grid{grid-template-columns:1fr}.form-grid{grid-template-columns:1fr}.form-grid .wide{grid-column:auto}dialog form{padding:19px}}

.scan-options textarea,.settings-form input,.settings-form select{border:1px solid #cfdcda;border-radius:10px;background:#fff;color:var(--ink);outline:none;font:inherit}.scan-options textarea{min-height:76px;padding:10px 12px;resize:vertical}.scan-options textarea:focus,.settings-form input:focus,.settings-form select:focus{border-color:var(--green2);box-shadow:0 0 0 3px #2b716d20}.settings-card{max-width:760px}.settings-form{padding:24px;display:grid;gap:18px}.settings-form label{display:grid;gap:8px;font-size:14px;font-weight:700}.settings-form input,.settings-form select{height:46px;padding:0 12px}.settings-form .primary{justify-self:start}.config-note{background:#f3f7f6;border:1px solid #dce8e5;border-radius:12px;padding:14px;color:#5e706c;font-size:13px;line-height:1.7}.config-note a{color:#1e6a63;font-weight:750}.ocr-box{border:1px solid #d7e5e1;background:#f8fbfa;border-radius:12px;padding:12px;margin:12px 0}.ocr-box summary{cursor:pointer;font-weight:750;color:#315e59}.ocr-box pre{white-space:pre-wrap;word-break:break-word;font:13px/1.7 inherit;margin:10px 0 0}.graded-item{border:1px solid #e0e9e7;border-radius:15px;padding:16px;margin-top:13px}.graded-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.graded-head h4{margin:0}.review{display:inline-block;background:#fff0e2;color:#a54e23;border-radius:100px;padding:5px 8px;font-size:12px;font-weight:750}.correct{background:#def2e7;color:#216c4e}.explanation{background:#f4f7f6;border-radius:10px;padding:11px;font-size:13px;line-height:1.65}.practice-answer{color:#647671}.model-line{color:#657a76;font-size:12px;margin-top:5px}

@media(max-width:650px){.sidebar nav{grid-template-columns:repeat(3,1fr)}.settings-form{padding:18px}.settings-form .primary{width:100%}.graded-head{align-items:flex-start}.scan-options textarea{min-height:68px}}