:root{--bg:#f4f6f9;--card-bg:#fff;--border:#e1e5eb;--text:#1f2733;--muted:#6b7684;--primary:#2f6fed;--primary-dark:#1f56c4;--danger:#d64545;--warning-bg:#fff3cd;--warning-text:#7a5b00;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}button{cursor:pointer;font:inherit;background:var(--primary);color:#fff;border:none;border-radius:8px;padding:10px 16px;transition:background .15s}button:hover:not(:disabled){background:var(--primary-dark)}button:disabled{opacity:.5;cursor:not-allowed}button.primary{background:#22a35a}button.primary:hover:not(:disabled){background:#1c8a4b}.link-button{color:var(--primary);background:0 0;padding:4px 0;text-decoration:none;display:inline-block}.link-button:hover{background:0 0;text-decoration:underline}.link-button.danger{color:var(--danger)}input,textarea,select{font:inherit;border:1px solid var(--border);color:var(--text);background:#fff;border-radius:6px;width:100%;padding:8px 10px}label{color:var(--muted);flex-direction:column;gap:4px;margin-bottom:12px;font-size:.9rem;display:flex}.checkbox-label{flex-direction:row;align-items:center;gap:8px}.checkbox-label input{width:auto}.page-center{flex-direction:column;justify-content:center;align-items:center;gap:16px;min-height:100%;padding:24px;display:flex}.auth-page{justify-content:center;align-items:center;min-height:100%;padding:16px;display:flex}.auth-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;width:100%;max-width:380px;padding:32px;box-shadow:0 4px 16px #0000000d}.auth-card h1{margin-top:0}.auth-switch,.auth-hint{color:var(--muted);text-align:center;font-size:.85rem}.error-banner{color:var(--danger);background:#fde8e8;border-radius:8px;margin-bottom:16px;padding:10px 14px;font-size:.9rem}.topbar{background:var(--card-bg);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px 24px;display:flex}.topbar-left{align-items:center;gap:16px;display:flex}.topbar-left h1{margin:0;font-size:1.25rem}.topbar-right{align-items:center;gap:16px;display:flex}.back-link{color:var(--muted);text-decoration:none}.page-container{flex-direction:column;gap:20px;max-width:960px;margin:0 auto;padding:24px;display:flex}.page-actions{justify-content:flex-end;display:flex}.card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:8px;padding:20px;display:flex}.card h2{margin-top:0}.card-link{color:inherit;text-decoration:none;transition:box-shadow .15s,transform .15s}.card-link:hover{transform:translateY(-1px);box-shadow:0 4px 12px #00000014}.card-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;display:grid}.form-inline label{margin-bottom:8px}.form-row{gap:16px;display:flex}.form-row label{flex:1}.muted{color:var(--muted);font-size:.85rem}.empty-hint{color:var(--muted);text-align:center;padding:40px 0}.tabs{border-bottom:1px solid var(--border);gap:8px;display:flex}.tab{color:var(--muted);background:0 0;border-bottom:2px solid #0000;border-radius:0;padding:10px 16px}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.tab:hover:not(.active){color:var(--text);background:0 0}.question-card-header{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.correct-option{color:#1c8a4b;font-weight:600}.options-editor{flex-direction:column;gap:8px;margin-bottom:16px;display:flex}.option-row{align-items:center;gap:8px;display:flex}.option-row input[type=radio],.option-row input[type=checkbox]{flex:none;width:auto}.option-row .option-text-input{flex:auto;width:auto;min-width:0}.results-table{border-collapse:collapse;width:100%}.results-table th,.results-table td{text-align:left;border-bottom:1px solid var(--border);padding:10px 12px;font-size:.9rem}.results-table th{color:var(--muted);font-weight:600}.attempt-page{flex-direction:column;max-width:720px;min-height:100%;margin:0 auto;padding:24px;display:flex;position:relative}.no-select{-webkit-user-select:none;user-select:none}.attempt-header{justify-content:space-between;align-items:center;margin-bottom:16px;font-weight:600;display:flex}.timer{font-variant-numeric:tabular-nums;background:var(--card-bg);border:1px solid var(--border);border-radius:999px;padding:6px 14px}.timer-warning{color:#fff;background:var(--danger);border-color:var(--danger)}.warning-banner{background:var(--warning-bg);color:var(--warning-text);cursor:pointer;border-radius:8px;margin-bottom:16px;padding:10px 14px;font-size:.9rem}.question-panel{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;flex:1;padding:28px}.options-list{flex-direction:column;gap:10px;margin-top:16px;display:flex}.option-choice{border:1px solid var(--border);cursor:pointer;color:var(--text);border-radius:8px;flex-direction:row;align-items:center;gap:10px;padding:12px;font-size:1rem;display:flex}.option-choice input{width:auto}.text-answer-input{margin-top:16px}.attempt-footer{justify-content:space-between;margin-top:20px;display:flex}.result-card{text-align:center;align-items:center;padding:40px}.score-display{color:var(--primary);font-size:2.5rem;font-weight:700}.score-percentage{color:var(--muted);font-size:1.25rem;font-weight:600}.watermark-overlay{z-index:1000;pointer-events:none;opacity:.08;grid-template-rows:repeat(6,1fr);grid-template-columns:repeat(4,1fr);display:grid;position:fixed;inset:0;transform:rotate(-20deg)scale(1.4)}.join-page{justify-content:center;align-items:center;min-height:100%;padding:16px;display:flex}.join-card{background:var(--card-bg);border:1px solid var(--border);border-radius:12px;width:100%;max-width:420px;padding:32px;box-shadow:0 4px 16px #0000000d}.join-card h1{margin-top:4px}.join-actions{flex-direction:column;align-items:flex-start;gap:12px;display:flex}.qr-card{flex-wrap:wrap;align-items:flex-start;gap:24px;display:flex}.qr-card img{border:1px solid var(--border);background:#fff;border-radius:8px}.qr-link-row{align-items:center;gap:8px;display:flex}.qr-link-row input{flex:1;font-family:monospace;font-size:.85rem}.watermark-tile{white-space:nowrap;color:#000;justify-content:center;align-items:center;font-size:.8rem;display:flex}.group-list{flex-direction:column;gap:8px;margin:0;padding:0;list-style:none;display:flex}.group-list li{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:6px 0;display:flex}.group-list li:last-child{border-bottom:none}.group-checkboxes{flex-wrap:wrap;gap:12px;display:flex}.group-checkboxes label{align-items:center;gap:6px;font-weight:400;display:flex}.attempt-detail{border-top:1px dashed var(--border);flex-direction:column;gap:12px;margin-top:8px;padding-top:12px;display:flex}.attempt-detail-answer{background:var(--bg-subtle,#00000008);border-radius:8px;padding:10px 12px}.attempt-detail-answer.correct{border-left:3px solid #1c8a4b}.attempt-detail-answer.incorrect{border-left:3px solid #c0392b}.violation-list{flex-direction:column;gap:4px;margin:0;padding:0;font-size:.85rem;list-style:none;display:flex}.violation-list li{justify-content:space-between;gap:12px;display:flex}.table-actions{flex-wrap:wrap;gap:10px;display:flex}.lecture-group-list{flex-direction:column;gap:28px;display:flex}.lecture-group-title{border-bottom:1px solid var(--border);margin:0 0 12px;padding-bottom:6px;font-size:1.1rem}.card-closed{opacity:.85}.badge-closed{color:var(--muted,#666);background:#00000014;border-radius:999px;align-self:flex-start;padding:2px 8px;font-size:.75rem;display:inline-block}.card-header-row{justify-content:space-between;align-items:center;gap:12px;display:flex}.card-header-row h2{margin:0}.app-shell{flex-direction:column;min-height:100vh;display:flex}.app-footer{border-top:1px solid var(--border);background:var(--card-bg);color:var(--muted);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-top:auto;padding:14px 24px;font-size:.8rem;display:flex}.app-footer a{color:var(--primary)}.app-routes{flex-direction:column;flex:1;display:flex}.cheat-warning-overlay{z-index:1000;color:#fff;cursor:pointer;background:#d64545;border-radius:10px;align-items:center;gap:10px;max-width:min(560px,100vw - 32px);padding:12px 16px;font-size:.9rem;font-weight:500;animation:.2s ease-out cheat-warning-in;display:flex;position:fixed;top:16px;left:50%;transform:translate(-50%);box-shadow:0 8px 24px #00000040}.cheat-warning-icon{flex-shrink:0;font-size:1.1rem}.cheat-warning-dismiss{opacity:.8;flex-shrink:0;margin-left:auto}@keyframes cheat-warning-in{0%{opacity:0;transform:translate(-50%,-12px)}to{opacity:1;transform:translate(-50%)}}.analytics-filters{flex-flow:wrap;align-items:flex-end;gap:16px}.analytics-filters label{flex:1;min-width:180px;margin-bottom:0}.analytics-summary-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;display:grid}.analytics-summary-tile{align-items:flex-start;gap:4px}.analytics-summary-tile strong{font-size:1.5rem}.metric-good{color:#1c8a4b}.metric-mid{color:#a06a00}.metric-bad{color:#c0392b}.card.metric-good{background:#eafaf1}.card.metric-mid{background:#fff8e6}.card.metric-bad{background:#fdecea}