:root{color-scheme:light;--ink:#182b48;--text:#26364b;--muted:#53627a;--bg:#f4f5f8;--line:#dbe1e9;--blue:#254d87;--blue-soft:#edf2fa;--teal:#286b61;--orange:#875424;--white:#fff;--danger:#9b3135;--radius:14px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;font-size:15px;line-height:1.65}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button:disabled{cursor:wait;opacity:.55}[hidden]{display:none!important}:focus-visible{outline:3px solid #537db3;outline-offset:4px}h1,h2,h3,p{margin-top:0}h1{font-size:32px;letter-spacing:-1px;line-height:1.3;margin-bottom:12px;color:var(--ink);font-weight:650}h2{font-size:20px;font-weight:650;color:var(--ink);margin-bottom:6px}h3{font-size:17px;margin-bottom:8px}p{margin-bottom:12px}.muted,.subtle{color:var(--muted)}.eyebrow{color:var(--blue);font-size:12px;letter-spacing:2px;font-weight:600;margin-bottom:12px}.num{font-variant-numeric:tabular-nums;white-space:nowrap}.site-header{background:#fff;border-bottom:1px solid var(--line)}.header-inner{max-width:1280px;margin:auto;min-height:78px;padding:0 32px;display:flex;align-items:center;gap:36px}.brand{font-size:19px;font-weight:650;color:var(--ink);white-space:nowrap}.brand-divider{font-weight:400;margin:0 14px;color:#a0aaba}.brand-light{font-weight:400}.header-inner nav{display:flex;gap:8px;margin:auto}.header-inner nav a{padding:12px 18px;border-radius:8px;color:var(--muted);font-size:14px;font-weight:600;white-space:nowrap}.header-inner nav a[aria-current="page"]{color:var(--blue);background:var(--blue-soft)}main{max-width:1280px;margin:auto;padding:38px 32px 64px;min-height:72vh}.page-heading{display:flex;justify-content:space-between;gap:24px;align-items:flex-start;margin-bottom:28px}.page-heading p{margin:0}.heading-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px;max-width:480px}.button{border:1px solid var(--line);border-radius:8px;background:white;color:var(--text);padding:10px 17px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:7px;white-space:nowrap;font-size:14px;font-weight:600}.button:hover{background:#f1f4f8;text-decoration:none}.button.primary{background:var(--blue);color:white;border-color:var(--blue)}.button.primary:hover{background:#193d71}.button.quiet{border-color:transparent;background:transparent;font-weight:400;color:var(--muted)}.meta{font-size:13px;color:var(--muted);margin-top:10px!important}.status{display:inline-block;border:1px solid #cbded8;border-radius:99px;background:#f2f8f5;color:#24594e;padding:3px 10px;font-size:12px;white-space:nowrap;font-weight:500}.status.warn{border-color:#e1d3be;background:#fbf7ef;color:#76501f}.status.review{border-color:#e4cfd1;background:#faf2f3;color:#89383e}.status.neutral{border-color:var(--line);background:#f6f7f9;color:var(--muted)}.demo-banner{background:#f9edcf;border-bottom:1px solid #e2cca0;text-align:center;padding:8px 18px;font-size:13px;color:#6b4b1e}.notice{border:1px solid #e1d3be;border-radius:10px;background:#fffaf0;color:#6e4b20;padding:12px 16px;margin-bottom:20px}.notice.error{border-color:#e4cfd1;background:#fff5f5;color:var(--danger)}.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:24px}.stat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px}.stat-card .label{font-size:13px;color:var(--muted);margin-bottom:6px}.stat-value{font-size:38px;line-height:1.3;font-weight:650;color:var(--ink);font-variant-numeric:tabular-nums}.stat-value small{font-size:14px;font-weight:400;margin-left:5px;color:var(--muted)}.stat-card .detail{font-size:12px;color:var(--muted);margin-top:8px}.panel{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:26px;margin-bottom:24px}.panel-head{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-bottom:20px}.panel-head p{margin:0;font-size:13px;color:var(--muted)}.table-wrap{max-width:100%}table{width:100%;border-collapse:collapse;text-align:left;font-size:14px}th{font-weight:500;color:var(--muted);background:#f6f8fb;font-size:12px;padding:13px 16px;white-space:nowrap}td{padding:17px 16px;border-bottom:1px solid #e9edf3;vertical-align:middle}tbody tr:last-child td{border-bottom:0}.group-name{font-weight:600;color:var(--ink)}.cell-note{display:block;color:var(--muted);font-size:12px;margin-top:4px}.total-row td{background:#f7f9fc}.table-note{font-size:12px;color:var(--muted);margin:16px 0 0}.comparison-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.chart-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.chart-heading h3{margin:0}.chart-heading span{color:var(--muted);font-size:12px}.bar-row{display:grid;grid-template-columns:88px minmax(0,1fr) 58px;gap:12px;align-items:center;margin-bottom:18px}.bar-label{font-size:13px;color:var(--muted)}.bar-track{height:18px;border-radius:4px;overflow:hidden;background:#edf0f5}.bar{height:100%;background:var(--blue);border-radius:4px;width:0}.bar.teal{background:var(--teal)}.bar-number{text-align:right;font-size:14px;font-weight:600;color:var(--ink)}.chart-note{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin-bottom:0}.report-callout{display:flex;align-items:center;justify-content:space-between;gap:24px;background:#eef2f8;border:1px solid #d7e0ed;border-radius:12px;padding:22px 26px;margin-bottom:24px}.report-callout p{margin:0;font-size:13px;color:var(--muted)}.report-callout h3{margin-bottom:6px}.method-details{font-size:13px;color:var(--muted)}.method-details summary{cursor:pointer;color:var(--blue);padding:6px 0}.method-details ul{padding-left:20px;margin-bottom:0}.method-details li{margin-bottom:7px}.metric-label{font-weight:600}.decision{font-weight:600;color:var(--text)}.decision.significant{color:var(--teal)}.report-mark{border:1px solid var(--line);border-radius:6px;padding:5px 10px;font-size:12px;white-space:nowrap}.filters{display:flex;gap:16px;align-items:flex-end;flex-wrap:wrap}.field{display:flex;flex-direction:column;gap:7px;min-width:180px}.field.grow{flex:1}.field label{font-size:13px;color:var(--muted)}input,select{background:#fff;border:1px solid #bdc8d6;border-radius:7px;color:var(--text);padding:10px 12px;min-height:44px;max-width:100%}input[type="search"]{width:100%}.groups-nav{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0 0}.groups-nav button{background:#f6f8fb;font-size:13px;border-color:#e2e7ef}.groups-nav button[aria-pressed="true"]{background:var(--blue-soft);border-color:#aebfd8;color:var(--blue)}.group-title{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.group-count{font-size:13px;font-weight:400;color:var(--muted)}.grade-table th,.grade-table td{padding:13px 12px}.grade-table td{font-size:13px}.grade-table .student-number{font-size:12px}.progress-text{color:var(--muted);font-size:11px;margin-left:6px}.empty{padding:54px 24px;text-align:center}.empty h2{font-size:22px;margin-bottom:12px}.empty p{color:var(--muted);max-width:530px;margin:0 auto 18px}.report-list{display:grid;gap:14px}.report-list-item{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:20px;border:1px solid var(--line);border-radius:10px;background:white}.report-list-item h3{font-size:15px;margin:0 0 4px}.report-list-item p{font-size:12px;color:var(--muted);margin:0}.site-footer{max-width:1280px;padding:20px 32px;margin:auto;border-top:1px solid var(--line);font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:16px}.login-shell{min-height:100dvh;display:grid;place-items:center;padding:24px}.login-card{width:100%;max-width:440px;background:white;border:1px solid var(--line);border-radius:18px;padding:40px}.login-card h1{font-size:27px}.login-card label{display:block;margin:24px 0 8px}.login-card input{width:100%}.login-card button{width:100%;margin-top:8px}.error-text{color:var(--danger);font-size:13px;min-height:22px;margin:10px 0 0}.skip-link{position:fixed;top:-100px;left:20px;padding:10px;background:white;z-index:10}.skip-link:focus{top:10px}
@media(min-width:1440px){main{padding-top:46px}}
@media(max-width:1050px){.header-inner{gap:12px}.header-inner nav{gap:0}.header-inner nav a{padding:10px 12px}.page-heading{flex-direction:column}.heading-actions{justify-content:flex-start;max-width:none}.stats-grid{gap:12px}.stat-card{padding:18px}.panel{padding:22px}.grade-table th,.grade-table td{padding:12px 8px}.progress-text{display:block;margin:3px 0 0}}
@media(max-width:820px){.header-inner{padding:16px 22px;flex-wrap:wrap;min-height:70px;gap:10px}.brand{font-size:17px}.header-inner nav{order:3;width:100%;justify-content:center;margin-top:5px}.header-inner nav a{flex:1;text-align:center}.header-inner>#logout{margin-left:auto;font-size:13px}main{padding:28px 22px 40px}h1{font-size:28px}.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.comparison-grid{grid-template-columns:1fr;gap:0}.report-callout{align-items:flex-start}.summary-table th,.summary-table td{padding:12px 8px;font-size:12px}.summary-table .cell-note{font-size:11px}.report-table thead{display:none}.report-table,.report-table tbody,.report-table tr,.report-table td{display:block}.report-table tr{border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:12px}.report-table td{padding:8px 0;border:0;display:flex;justify-content:space-between;gap:14px;text-align:right}.report-table td:before{content:attr(data-label);color:var(--muted);font-size:12px;text-align:left}.grade-table thead{display:none}.grade-table,.grade-table tbody{display:block}.grade-table tbody{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.grade-table tr{display:block;border:1px solid var(--line);border-radius:9px;padding:12px}.grade-table td{display:flex;justify-content:space-between;gap:10px;border:0;padding:5px 0;font-size:13px;text-align:right}.grade-table td:before{content:attr(data-label);color:var(--muted);font-size:12px;white-space:nowrap;text-align:left}.grade-table .student-number{font-size:12px}.grade-table .cell-note{font-size:11px;max-width:155px}.grade-table .progress-text{display:inline;margin-left:5px}.grade-table td:last-child{border-top:1px solid #edf0f5;margin-top:7px;padding-top:10px}.site-footer{padding:20px 22px;flex-direction:column;gap:6px}}
@media(max-width:540px){main{padding:24px 16px 34px}.header-inner{padding:14px 16px}.brand-divider{margin:0 10px}.stats-grid{gap:10px}.stat-card{padding:16px}.stat-value{font-size:32px}.stat-card .detail{font-size:11px}.panel{padding:18px;margin-bottom:16px}.panel-head{align-items:flex-start;gap:8px}.panel-head h2{font-size:18px}.page-heading{margin-bottom:22px;gap:18px}h1{font-size:26px}.heading-actions{gap:8px}.heading-actions .button{font-size:13px;padding:9px 12px}.summary-table thead{display:none}.summary-table,.summary-table tbody,.summary-table tr,.summary-table td{display:block}.summary-table tr{padding:12px 0;border-bottom:1px solid var(--line)}.summary-table tr:last-child{border:0}.summary-table td{border:0;padding:5px 0;display:flex;justify-content:space-between;gap:12px;text-align:right;font-size:14px}.summary-table td:before{content:attr(data-label);font-size:12px;color:var(--muted);text-align:left}.summary-table td:first-child{font-weight:600}.total-row td{background:none}.report-callout{padding:18px;flex-direction:column;gap:14px}.report-callout .button{width:100%}.grade-table tbody{grid-template-columns:1fr}.filters{gap:12px}.field{width:100%;min-width:0}.group-title{gap:6px}.group-count{font-size:12px}.report-list-item{align-items:flex-start}.report-list-item .button{padding:9px 12px;font-size:13px}.login-card{padding:30px 24px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media print{body{background:white;font-size:11px}.site-header,.site-footer,.demo-banner,.heading-actions,.notice,.filters,.groups-nav,.report-callout,.method-details,.no-print{display:none!important}main{padding:0;max-width:none}.panel,.stat-card{break-inside:avoid;box-shadow:none}.panel{padding:16px;margin-bottom:14px}.stats-grid{gap:10px;margin-bottom:14px}.stat-value{font-size:26px}h1{font-size:24px}.page-heading{margin-bottom:14px}.comparison-grid{grid-template-columns:1fr 1fr}.grade-table,.grade-table tbody{display:table}.grade-table tbody{display:table-row-group}.grade-table tr{display:table-row;border:0}.grade-table td{display:table-cell}.grade-table td:before{display:none}.grade-table thead{display:table-header-group}.grade-table th,.grade-table td{padding:6px}.report-table thead{display:table-header-group}.report-table{display:table}.report-table tbody{display:table-row-group}.report-table tr{display:table-row;border:0}.report-table td{display:table-cell;text-align:left}.report-table td:before{display:none}}