:root{color-scheme:light;--ink:#182d33;--muted:#69777b;--line:#e2e8e5;--paper:#f5f7f4;--green:#166b57;--mint:#e6f3ec;--red:#a73c36}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:14px/1.6 "Segoe UI","Microsoft YaHei",sans-serif}button,input,select,textarea{font:inherit}button{cursor:pointer;border:0;transition:background .15s}button:disabled{cursor:wait;opacity:.6}button:focus-visible,a:focus-visible{outline:3px solid #6fb89f;outline-offset:3px}button.primary{background:var(--green);color:#fff;border:1px solid var(--green);border-radius:8px;padding:10px 18px;font-weight:600}.primary:hover{background:#105442}.secondary{border:1px solid #cfdad4;background:#fff;border-radius:7px;color:var(--ink);padding:7px 12px}.secondary:hover{background:#f1f6f2}.plain{background:transparent;color:var(--green);padding:7px 9px;border-radius:6px}.plain:hover{background:var(--mint)}input,select,textarea{background:#fff;border:1px solid #cfd9d3;border-radius:7px;padding:10px 12px;color:var(--ink);max-width:100%}input:focus,select:focus,textarea:focus{outline:2px solid #87baa6;outline-offset:1px}textarea{resize:vertical;width:100%}label{display:block;font-weight:600;margin:16px 0 6px}label small{font-weight:400;color:var(--muted);margin-left:8px}h1,h2,p{margin:0}h1{font-size:32px;letter-spacing:-.8px;line-height:1.4}h2{font-size:17px;line-height:1.5}small{font-size:12px}.muted{color:var(--muted);margin-top:8px}.eyebrow{font-size:10px;letter-spacing:2px;font-weight:700;color:var(--green);margin-bottom:8px}.brand{display:flex;gap:11px;align-items:center;white-space:nowrap}.brand strong{font-size:20px;letter-spacing:1px}.brand>span:last-child{color:var(--muted)}.brand-mark{background:var(--green);color:#fff;display:grid;place-items:center;height:32px;width:32px;border-radius:9px;font-size:20px;font-weight:700}.brand-divider{color:#c1ccc6}.topbar{height:74px;border-bottom:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 36px}.header-right{display:flex;gap:18px;align-items:center}.badge{font-size:12px;background:var(--mint);color:var(--green);padding:4px 10px;border-radius:99px}.container{max-width:1360px;padding:38px 36px 20px;margin:0 auto}.page-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:24px}.notice{display:flex;gap:10px;background:#edf2ed;border:1px solid #dce5dc;border-radius:8px;padding:12px 16px;color:#526558;font-size:13px;margin-bottom:24px}.notice-dot{flex-shrink:0;width:7px;height:7px;border-radius:50%;background:#3e8066;margin-top:7px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:26px}.stats article{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px 22px}.stats article>span,.stats small{display:block;color:var(--muted)}.stats strong{display:block;font-size:34px;font-weight:600;line-height:1.6;font-variant-numeric:tabular-nums}.panel{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:22px;overflow:hidden}.panel-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px 22px}.count{margin-left:8px;font-size:12px;padding:2px 7px;border-radius:5px;background:#eff3ef;color:#6d7a71;vertical-align:middle}.filters{display:flex;gap:8px;align-items:center}.filters input{width:225px;padding:8px 12px}.filters select{padding:8px}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;text-align:left;white-space:nowrap;font-size:13px}th{color:#788780;font-size:12px;font-weight:500;background:#f8faf7;padding:12px 18px;border-top:1px solid #edf0eb;border-bottom:1px solid #edf0eb}td{padding:19px 18px;border-bottom:1px solid #edf0eb;vertical-align:middle}td:first-child strong{display:block;font-weight:600;font-size:13px}td small{display:block;color:#839089;margin-top:4px;font-family:Consolas,monospace}.status{display:inline-block;font-size:12px;border-radius:5px;padding:3px 8px;background:#f1f3f1;color:#738077}.status.active{color:#156146;background:#e7f4eb}.status.disabled{color:#956724;background:#fbf2e1}.status.expired{color:#a0443e;background:#f9eae7}.row-actions{display:flex;gap:2px}.row-actions button{font-size:12px;padding:4px 7px}.row-actions .danger{color:var(--red)}.table-note{font-size:12px;color:#859086;padding:12px 20px}.empty{text-align:center;padding:45px 15px;color:var(--muted)}.demo-panel{padding:24px}.demo-heading{display:flex;align-items:center;justify-content:space-between;gap:20px}.demo-heading h2{margin-top:3px}.demo-heading p{font-size:12px}.demo-controls{display:flex;gap:26px;flex-wrap:wrap;margin:23px 0 18px}.demo-controls>div{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.demo-controls strong{font-size:13px;margin-right:3px}.device-icon{display:grid;place-items:center;border:1px solid #dce5df;border-radius:7px;color:var(--green);width:30px;height:30px;font-family:Consolas,monospace;font-weight:700}.demo-controls button{font-size:12px}.demo-result{padding:12px 15px;border-radius:6px;background:#f3f6f2;border-left:3px solid #bdd4c7;white-space:pre-wrap;font-size:13px;color:#54675c}.demo-result.failed{background:#fff2ef;border-left-color:#c88171;color:#973a30}.audit-panel{padding:0 22px}.audit-panel summary{cursor:pointer;padding:17px 0;font-weight:600}.audit-list{max-height:320px;overflow:auto}.audit-row{padding:12px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;font-size:12px}.audit-row span{color:var(--muted)}footer{color:#929c95;font-size:11px;display:flex;justify-content:space-between;padding:0 3px}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:30px}.login-card{background:#fff;border:1px solid var(--line);padding:42px;border-radius:16px;width:430px;max-width:100%;box-shadow:0 18px 60px #183e2210}.login-card .brand{margin-bottom:44px}.login-card h1{font-size:30px}.login-card form{margin-top:25px}.login-card input{width:100%}.full{width:100%;margin-top:16px}.hint{font-size:12px;color:var(--muted);margin-top:16px}.error{color:var(--red);font-size:13px;margin-top:12px;min-height:8px}dialog{border:1px solid var(--line);border-radius:12px;width:560px;max-width:calc(100vw - 32px);padding:28px;color:var(--ink);box-shadow:0 20px 80px #12201f35}dialog::backdrop{background:#152d3355;backdrop-filter:blur(2px)}.dialog-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.dialog-heading h2{font-size:21px}.close{background:transparent;font-size:25px;color:#7b8a82;line-height:1;padding:5px}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:24px}.student-name{font-weight:600;margin-top:15px}.warning{padding:12px;background:#fcf4e5;border:1px solid #eaddbf;border-radius:7px;font-size:12px;color:#8b6427;margin-top:14px}#issuedCodes{margin-top:18px;font-family:Consolas,"Microsoft YaHei",monospace;font-size:12px}#toast{position:fixed;right:28px;bottom:28px;background:#183c31;color:#fff;padding:13px 20px;border-radius:8px;box-shadow:0 5px 24px #12201f25;max-width:calc(100vw - 56px);z-index:10}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}@media(max-width:850px){.topbar{padding:0 20px}.container{padding:26px 20px}.panel-toolbar{flex-direction:column;align-items:stretch}.filters input{flex:1;width:120px}.stats{gap:10px}.stats article{padding:15px}.stats small{font-size:10px}.demo-heading{align-items:flex-start}.header-right{gap:8px}.demo-controls{gap:16px}}@media(max-width:520px){.stats{grid-template-columns:repeat(2,1fr)}.page-heading{align-items:flex-start;flex-direction:column}.page-heading .primary{width:100%}.brand{gap:7px}.brand>span:last-child{font-size:12px}.header-right .badge{display:none}.filters{flex-wrap:wrap}.demo-heading{flex-direction:column}.login-card{padding:28px}.dialog-actions{flex-wrap:wrap}footer{gap:10px;flex-direction:column}h1{font-size:28px}.demo-controls>div{gap:7px}.demo-panel{padding:20px}}

.code-reveal{display:block;font-size:12px;margin-top:5px;padding:3px 0;text-align:left}