:root{--ink:#172033;--muted:#65708a;--line:#e3e8f1;--surface:#fff;--surface-soft:#f6f8fc;--primary:#315efb;--primary-dark:#2346c5;--success:#137a55;--warning:#a05a00;--danger:#b42318}*{box-sizing:border-box}body,html{margin:0;min-height:100%}body{background:var(--surface-soft);color:var(--ink);font-family:Microsoft YaHei,PingFang SC,Arial,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}.app-shell{display:flex;min-height:100vh}.sidebar{background:#111a2e;color:#dce5ff;display:flex;flex-direction:column;padding:28px 18px;width:244px}.brand{margin:0 10px 30px}.brand strong{color:#fff;display:block;font-size:20px}.brand span{color:#8fa4d8;display:block;font-size:12px;margin-top:6px}.nav{display:grid;grid-gap:7px;gap:7px}.nav a{border-radius:10px;color:#b4c2e4;padding:12px 14px}.nav a:hover{background:#26385f;color:#fff}.sidebar-footer{color:#8494bc;font-size:12px;margin-top:auto;padding:12px 10px}.sidebar-footer span{display:block;margin-top:12px}.sidebar-logout{background:transparent;border:1px solid #40527d;border-radius:8px;color:#dce5ff;font-size:12px;padding:8px 10px;width:100%}.sidebar-logout:hover{background:#26385f}.main{flex:1 1;min-width:0;padding:34px clamp(20px,4vw,56px)}.content{margin:0 auto;max-width:1180px}.topbar{align-items:flex-start;display:flex;justify-content:space-between;gap:20px;margin-bottom:30px}.eyebrow{color:var(--primary);font-size:13px;font-weight:700;letter-spacing:.08em;margin:0 0 8px;text-transform:uppercase}h1{font-size:clamp(26px,4vw,38px);line-height:1.2}h1,h2{margin:0}h2{font-size:20px}h3{font-size:16px;margin:0}.muted{color:var(--muted)}.small{font-size:13px}.grid{display:grid;grid-gap:18px;gap:18px}.stats-grid{grid-template-columns:repeat(3,minmax(0,1fr));margin-bottom:24px}.two-col{grid-template-columns:minmax(0,1fr) minmax(280px,.65fr)}.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 8px 24px rgba(31,48,90,.04)}.settings-card{max-width:640px}.task-publish-header{margin-bottom:26px;position:relative}.task-publish-header h1{letter-spacing:-.03em}.task-publish-header .muted{font-size:14px;margin-top:10px}.task-header-mark{align-items:center;background:linear-gradient(145deg,#e9efff,#f7f9ff);border:1px solid #d9e2ff;border-radius:18px;color:var(--primary);display:flex;flex-direction:column;justify-content:center;min-height:82px;min-width:82px;transform:rotate(3deg)}.task-header-mark span{font-size:10px;font-weight:800;letter-spacing:.16em}.task-header-mark strong{font-size:22px;letter-spacing:.08em;margin-top:2px}.task-publish-layout{align-items:start;display:grid;grid-gap:18px;gap:18px;grid-template-columns:minmax(0,.9fr) minmax(320px,1.1fr)}.task-form-card{background:linear-gradient(145deg,#fff,#fbfcff);border-color:#dfe5f2;overflow:hidden;padding:0}.task-form-header{align-items:flex-start;border-bottom:1px solid #e8edf5;margin:0;padding:24px 24px 20px}.task-form-header h2{font-size:22px;margin-top:4px}.task-form-header p{color:var(--muted);font-size:13px;margin:8px 0 0}.task-section-kicker{color:var(--primary);font-size:10px;font-weight:800;letter-spacing:.14em}.task-step-badge{align-items:center;background:#edf2ff;border:1px solid #d9e3ff;border-radius:999px;color:var(--primary);display:inline-flex;font-size:12px;font-weight:700;padding:7px 10px}.task-form{gap:18px;padding:24px}.task-field{gap:8px}.deadline-label-row label,.task-field>label{color:#2c3850;font-size:13px;font-weight:750}.task-select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2365708a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 13px center!important;padding-right:40px!important}.deadline-control:hover,.task-select:hover{border-color:#aebde3}.deadline-label-row{align-items:center;display:flex;justify-content:space-between}.deadline-label-row span{background:#f1f4f9;border-radius:999px;color:var(--muted);font-size:11px;padding:4px 8px}.deadline-control{align-items:center;background:#fff;border:1px solid #ced6e4;border-radius:11px;display:flex;min-height:48px;padding-left:13px;transition:border-color .18s,box-shadow .18s}.deadline-control:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px rgba(49,94,251,.11)}.deadline-icon{color:var(--primary);flex:none;height:20px;width:20px}.deadline-control input{background:transparent;border:0;border-radius:0;min-width:0;outline:0;padding:12px 12px 12px 9px}.deadline-control input:focus{box-shadow:none}.deadline-hint{color:var(--muted);font-size:12px;line-height:1.6;margin:0}.task-form-actions{border-top:1px solid #edf0f6;margin-top:2px;padding-top:20px}.task-form-actions .button{min-height:44px;padding-left:18px;padding-right:18px}.task-publish-button{box-shadow:0 7px 16px rgba(49,94,251,.2);font-weight:700}.task-content-preview{min-width:0;position:-webkit-sticky;position:sticky;top:24px}.task-content-preview .card-header{align-items:flex-start}.task-content-preview .card-header p{margin:6px 0 0}.task-content-empty h2{margin:0}.task-content-empty>p{margin:7px 0 0}.task-document-shell{background:#dfe5ef;border:1px solid var(--line);border-radius:10px;max-height:calc(100vh - 220px);overflow:auto;padding:24px}.task-document{background:#fff;box-shadow:0 5px 18px rgba(37,51,78,.14);box-sizing:border-box;margin:0 auto;min-height:1050px;padding:54px 62px 48px;width:min(100%,794px)}.task-document-header{border-bottom:1px solid #2e3645;padding-bottom:22px;text-align:center}.task-document-header p{color:#4b5567;font-size:14px;margin:0 0 12px}.task-document-header h1{font-family:SimSun,Songti SC,serif;font-size:30px;letter-spacing:.2em;margin:0;padding-left:.2em}.task-document-header h2{font-size:18px;font-weight:600;margin:15px 0 20px}.task-document-header dl{display:grid;font-size:13px;grid-gap:8px 20px;gap:8px 20px;grid-template-columns:1fr 1fr;margin:0;text-align:left}.task-document-header dl div{display:flex;gap:8px;min-width:0}.task-document-header dt{color:#667085;white-space:nowrap}.task-document-header dd{border-bottom:1px solid #aab3c1;flex:1 1;margin:0;min-height:20px;overflow-wrap:anywhere}.task-document-sections{display:grid;grid-gap:22px;gap:22px;padding-top:25px}.task-document-section h3{font-family:SimSun,Songti SC,serif;font-size:17px;margin:0 0 8px}.task-document-section p{color:#202938;font-family:SimSun,Songti SC,Microsoft YaHei,serif;font-size:14px;line-height:1.9;margin:0;white-space:pre-wrap;overflow-wrap:anywhere}.task-document-formula{background:#f5f7fb;border-radius:6px;margin-top:12px;padding:10px 12px;text-align:center}.task-document-formula span{color:#778196;display:block;font-size:11px;margin-bottom:5px}.task-document-formula strong{color:#202938;font-family:Georgia,Times New Roman,serif;font-size:18px;font-weight:600;letter-spacing:.02em}.task-document-footer{border-top:1px solid #d4dae3;color:#778196;font-size:10px;margin-top:28px;padding-top:12px;text-align:center}.filter-controls{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}.filter-controls select{min-width:118px}.sr-only{height:1px;margin:-1px;overflow:hidden;position:absolute;width:1px;clip:rect(0,0,0,0);white-space:nowrap}.stat-value{font-size:34px;font-weight:750;margin-top:12px}.stat-label{color:var(--muted);font-size:13px}.card-header{align-items:center;display:flex;justify-content:space-between;gap:16px;margin-bottom:18px}.button{background:var(--primary);border:1px solid var(--primary);border-radius:9px;color:#fff;display:inline-flex;justify-content:center;padding:10px 15px}.button:hover{background:var(--primary-dark)}.button.secondary{background:#fff;border-color:var(--line);color:var(--ink)}.button:disabled{cursor:wait;opacity:.6}.form{display:grid;grid-gap:15px;gap:15px}.field{display:grid;grid-gap:7px;gap:7px}.field label{font-size:13px;font-weight:700}.field input,.field select,.field textarea{background:#fff;border:1px solid #ced6e4;border-radius:9px;color:var(--ink);padding:11px 12px;width:100%}.field textarea{min-height:100px;resize:vertical}.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(49,94,251,.12);outline:0}.form-actions{display:flex;flex-wrap:wrap;gap:10px}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%}td,th{border-bottom:1px solid var(--line);padding:14px 10px;text-align:left;vertical-align:top}th{color:var(--muted);font-size:12px}td{font-size:14px}.code{background:#eef2ff;border-radius:6px;color:#2d4ec7;display:inline-block;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-weight:700;letter-spacing:.12em;padding:5px 8px}.badge{border-radius:999px;display:inline-flex;font-size:12px;padding:5px 9px}.badge.draft{background:#f0f2f6;color:#596478}.badge.submitted{background:#fff5df;color:var(--warning)}.badge.graded{background:#e8f7ef;color:var(--success)}.alert{border-radius:9px;font-size:14px;margin-bottom:16px;padding:12px 14px}.alert.error{background:#fff1f0;color:var(--danger)}.alert.success{background:#eaf8f0;color:var(--success)}.empty{color:var(--muted);padding:28px 8px;text-align:center}.login-shell{align-items:center;display:flex;justify-content:center;min-height:100vh;padding:24px}.login-card{background:#fff;border:1px solid var(--line);border-radius:18px;max-width:440px;padding:34px;width:100%}.login-card h1{font-size:28px;margin-bottom:10px}.login-card .form{margin-top:26px}.report-content{background:#f8faff;border-radius:9px;line-height:1.7;max-height:180px;overflow:auto;padding:12px;white-space:pre-wrap}.notice{background:#f7f9fe;border-left:3px solid var(--primary);color:var(--muted);font-size:13px;line-height:1.7;padding:12px 14px}.report-layout{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);align-items:start}.report-detail,.report-list{min-width:0}.report-filters{justify-content:flex-start;margin-bottom:16px}.report-filters select{background:#fff;border:1px solid var(--line);border-radius:8px;padding:8px}.report-selected{background:#f2f5ff}.report-select{background:none;border:0;color:var(--primary);font-weight:700;padding:0;text-align:left;line-height:1.5}.report-select:hover{text-decoration:underline}.report-select:focus-visible{outline:2px solid var(--primary);outline-offset:3px}.report-select:disabled{cursor:wait;opacity:.6}.report-section{min-width:0}.report-section h3{margin-bottom:10px}.report-detail .report-content{overflow-wrap:anywhere}.report-body{max-height:none}.report-source summary{color:var(--muted);cursor:pointer;font-size:13px;margin-bottom:12px}.report-metrics{display:flex;flex-wrap:wrap;gap:12px 24px;margin:14px 0 0}.report-metrics dt{color:var(--muted);font-size:12px}.report-metrics dd{font-size:14px;margin:5px 0 0}@media (max-width:1100px){.report-layout{grid-template-columns:1fr}}@media (max-width:900px){.task-publish-layout{grid-template-columns:1fr}.task-content-preview{position:static}.task-document-shell{max-height:none;padding:14px}}@media (max-width:560px){.task-document{min-height:auto;padding:32px 22px}.task-document-header dl{grid-template-columns:1fr}}@media (max-width:820px){.app-shell{display:block}.sidebar{width:auto}.nav{grid-template-columns:repeat(4,minmax(0,1fr))}.nav a{font-size:13px;padding:9px;text-align:center}.sidebar-footer{display:none}.stats-grid,.two-col{grid-template-columns:1fr}}@media (max-width:520px){.main{padding:24px 14px}.topbar{display:block}.topbar .button{margin-top:14px}.task-header-mark{margin-top:18px;min-height:64px;min-width:64px;width:64px}.task-header-mark strong{font-size:18px}.task-form,.task-form-header{padding-left:18px;padding-right:18px}.deadline-control input{font-size:13px}.nav{grid-template-columns:repeat(2,1fr)}}