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24px;border:1px solid var(--ds-border);border-radius:8px;background:var(--ds-card);box-shadow:none;transition:all .2s ease}.quiz-kc-question-card .quiz-option:hover:not(:disabled){border-color:var(--ds-primary);background:var(--ds-bg)}.quiz-kc-question-card .quiz-option.is-selected{border-color:var(--ds-primary);background:var(--ds-primary-soft)}.quiz-kc-question-card .quiz-option.correct{border-color:var(--ds-success);background:var(--ds-success-soft)}.quiz-kc-question-card .quiz-option.wrong-selected{border-color:var(--ds-danger);background:var(--ds-danger-soft)}.quiz-kc-question-card .quiz-radio-custom{width:20px;height:20px;border-color:var(--ds-border);margin-top:2px}.quiz-kc-question-card .quiz-option.correct .quiz-radio-custom,.quiz-kc-question-card .quiz-option.is-selected .quiz-radio-custom{border-color:var(--ds-success)}.quiz-kc-question-card .quiz-option.is-selected:not(.correct) .quiz-radio-custom{border-color:var(--ds-primary)}.quiz-kc-question-card 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8%,var(--ds-card));color:var(--ds-primary);font-size:11px;font-weight:800;letter-spacing:.01em}.quiz-hint-mock-source{flex-wrap:wrap;gap:8px;margin:12px 0 0;color:var(--ds-text-secondary);font-size:13px;line-height:1.45}.quiz-hint-mock-source svg{color:var(--ds-primary)}.quiz-hint-mock-source code{padding:3px 7px;border-radius:6px;background:var(--ds-bg);color:var(--ds-text-secondary);font-size:11px}.quiz-hint-scaffold{display:grid;gap:14px;margin-top:18px;padding:18px 20px;border:1px solid color-mix(in srgb,var(--ds-primary) 26%,var(--ds-border));border-radius:12px;background:color-mix(in srgb,var(--ds-primary) 7%,var(--ds-card));box-shadow:0 10px 24px rgba(var(--ds-primary-rgb),.07);animation:quiz-tutor-nudge-in .24s ease-out both}.quiz-hint-scaffold-actions,.quiz-hint-scaffold-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.quiz-hint-scaffold-head>span:last-child{color:var(--ds-text-secondary);font-size:12px;font-weight:700}.quiz-hint-level{gap:7px;color:var(--ds-primary);font-size:13px;font-weight:850;text-transform:uppercase;letter-spacing:.04em}.quiz-hint-scaffold>p{margin:0;color:var(--ds-text-main);font-size:16px;font-weight:650;line-height:1.6}.quiz-hint-citation{width:-moz-fit-content;width:fit-content;gap:7px;padding:7px 10px;border-radius:7px;background:var(--ds-card);color:var(--ds-text-secondary);font-size:12px}.quiz-hint-citation svg{color:var(--ds-primary)}.quiz-hint-scaffold-actions{padding-top:12px;border-top:1px solid color-mix(in srgb,var(--ds-primary) 16%,var(--ds-border))}.quiz-hint-scaffold-actions>span{color:var(--ds-text-secondary);font-size:13px}.quiz-hint-scaffold-buttons{display:flex;flex:0 0 auto;align-items:center;gap:8px}.quiz-hint-scaffold-actions button{flex:0 0 auto;min-height:36px;padding:0 12px;border:1px solid var(--ds-border);border-radius:7px;background:var(--ds-card);color:var(--ds-text-main);font:inherit;font-size:13px;font-weight:700;cursor:pointer}.quiz-hint-scaffold-actions .quiz-hint-retry-button{display:inline-flex;align-items:center;gap:7px;border-color:var(--ds-primary);background:var(--ds-primary);color:#fff}.quiz-hint-scaffold-actions .quiz-hint-retry-button:hover{background:color-mix(in srgb,var(--ds-primary) 88%,#000);color:#fff}.quiz-hint-scaffold-actions button:hover{border-color:var(--ds-primary);color:var(--ds-primary)}@media (max-width:640px){.quiz-hint-scaffold-actions,.quiz-hint-scaffold-head{align-items:flex-start;flex-direction:column}.quiz-hint-scaffold-actions button{width:100%}.quiz-hint-scaffold-buttons{width:100%;flex-direction:column}}.quiz-tutor-nudge{display:grid;grid-template-columns:64px minmax(0,1fr);align-items:end;gap:14px;padding:16px 18px;border:1px solid color-mix(in srgb,var(--ds-danger) 22%,var(--ds-border));border-radius:12px;background:color-mix(in srgb,var(--ds-danger-soft) 38%,var(--ds-card));animation:quiz-tutor-nudge-in .28s ease-out both}.quiz-tutor-nudge-mascot{width:64px;height:64px;-o-object-fit:contain;object-fit:contain;transform-origin:50% 100%;animation:quiz-tutor-mascot-bob 1.8s ease-in-out infinite}.quiz-tutor-nudge-bubble{position:relative;min-width:0;padding:14px 16px;border:1px solid var(--ds-border);border-radius:12px;background:var(--ds-card);box-shadow:0 10px 24px rgba(var(--ds-primary-rgb),.08)}.quiz-tutor-nudge-bubble:before{content:"";position:absolute;left:-8px;bottom:18px;width:14px;height:14px;border-left:1px solid var(--ds-border);border-bottom:1px solid var(--ds-border);background:var(--ds-card);transform:rotate(45deg)}.quiz-tutor-nudge-bubble span{display:block;margin-bottom:5px;color:var(--ds-danger);font-size:12px;font-weight:800}.quiz-tutor-nudge-bubble strong{display:block;color:var(--ds-text-main);font-size:15px;line-height:1.45;font-weight:700}@keyframes quiz-tutor-nudge-in{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes quiz-tutor-mascot-bob{0%,to{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-5px) rotate(3deg)}}@media (prefers-reduced-motion:reduce){.quiz-tutor-nudge,.quiz-tutor-nudge-mascot{animation:none}}.quiz-kc-question-card .quiz-answer-feedback{margin:0;padding:16px 20px;border-radius:8px;border:1px solid var(--ds-border);background:var(--ds-bg);align-items:flex-start;gap:12px}.quiz-answer-feedback-icon{width:24px;height:24px;flex:0 0 auto;border-radius:50%;display:grid;place-items:center;background:var(--ds-success-soft);color:var(--ds-success)}.quiz-answer-feedback.is-wrong{border-color:var(--ds-border);background:var(--ds-bg)}.quiz-answer-feedback.is-wrong .quiz-answer-feedback-icon{background:var(--ds-danger-soft);color:var(--ds-danger)}.quiz-answer-feedback-copy strong{color:var(--ds-text-main);font-size:16px;font-weight:600;display:block}.quiz-answer-feedback.is-wrong .quiz-answer-feedback-copy strong{color:var(--ds-text-main)}.quiz-answer-feedback-explanation{margin:4px 0 0;color:var(--ds-text-secondary);font-size:15px;font-style:normal;line-height:1.5}.quiz-explanation-box{padding:20px 24px;border:1px solid var(--ds-border);border-radius:8px;background:var(--ds-bg)}.quiz-explanation-toggle{width:-moz-fit-content;width:fit-content;min-height:40px;display:inline-flex;align-items:center;gap:8px;padding:0 16px;border:1px solid var(--ds-border);border-radius:6px;background:transparent;color:var(--ds-text-main);font:inherit;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s ease}.quiz-explanation-toggle:hover{border-color:var(--ds-primary);color:var(--ds-primary);background:var(--ds-bg)}.quiz-explanation-box-title{display:flex;align-items:center;gap:12px;color:var(--ds-text-main);font-size:16px;font-weight:600}.quiz-explanation-box p{margin:12px 0 0;color:var(--ds-text-secondary);font-size:15px;line-height:1.6}.quiz-kc-question-card .quiz-main-footer{position:static;display:flex;align-items:center;gap:16px;margin-top:32px;padding-top:24px;border-top:1px solid var(--ds-border);background:transparent}.quiz-kc-question-card .quiz-main-top-actions{display:flex;align-items:center;gap:16px;margin:0 0 24px;padding:0;border-bottom:none;background:transparent}.quiz-kc-question-card .quiz-btn-secondary{min-width:0;white-space:nowrap;height:44px;justify-content:center;border-color:var(--ds-border);background:transparent;color:var(--ds-text-main);font-size:14px;font-weight:500}.quiz-kc-question-card .quiz-btn-secondary:hover{border-color:var(--ds-primary);color:var(--ds-primary)}.quiz-kc-question-card .quiz-main-footer-left{max-width:360px;min-width:0}.quiz-kc-question-card .quiz-main-top-actions .quiz-main-footer-left{flex:1 1 auto;min-height:44px;justify-content:center;border-radius:6px;background:var(--ds-bg);color:var(--ds-text-main);font-weight:500}.quiz-kc-question-card .quiz-main-footer .quiz-btn-submit-right{width:auto;min-width:160px;height:44px;margin-left:auto;border-radius:6px;background:var(--ds-primary);font-size:14px;font-weight:600;box-shadow:none}.quiz-kc-question-card .quiz-main-top-actions .quiz-btn-submit-right{width:auto;min-width:140px;height:44px;margin-left:0;border-radius:6px;background:var(--ds-primary);font-size:14px;font-weight:600;box-shadow:none}.quiz-kc-question-card .quiz-main-footer .quiz-btn-primary--inactive,.quiz-kc-question-card .quiz-main-top-actions .quiz-btn-primary--inactive{background:var(--ds-border);box-shadow:none}.quiz-kc-sidebar{gap:24px}.quiz-kc-progress-panel{padding:24px;border-radius:12px;border:1px solid var(--ds-border);background:var(--ds-card);box-shadow:none}.quiz-kc-progress-panel .quiz-right-title{font-size:18px;font-weight:600;color:var(--ds-text-main)}.quiz-kc-panel-divider{height:1px;margin:16px 0;background:var(--ds-border)}.quiz-kc-panel-body h2{margin:0 0 16px;color:var(--ds-text-main);font-size:16px;font-weight:600}.quiz-kc-progress-panel .quiz-side-label{color:var(--ds-text-secondary);font-size:14px;font-weight:400}.quiz-current-kc-block{display:grid;gap:10px}.quiz-current-kc-block strong{color:var(--ds-text-main);font-size:18px;font-weight:700;line-height:1.3}.quiz-current-kc-mastery-row{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--ds-text-secondary);font-size:14px}.quiz-current-kc-mastery-row em{color:var(--ds-success);font-size:22px;font-style:normal;font-weight:700}.quiz-kc-progress-panel .quiz-side-mastery{margin-top:8px;color:var(--ds-text-main);font-size:36px;font-weight:700}.quiz-kc-progress-panel .quiz-live-mastery-delta{width:-moz-fit-content;width:fit-content;margin-top:8px;min-height:28px;gap:6px;padding:0 10px;border-radius:6px;background:var(--ds-success-soft);color:var(--ds-success);font-size:13px;font-weight:600;line-height:1}.quiz-kc-progress-panel .quiz-live-mastery-delta--kc{margin-top:0}.quiz-kc-progress-panel .quiz-live-mastery-delta.is-negative{background:hsla(0,93%,94%,.78);color:var(--ds-danger,#dc2626)}.quiz-kc-progress-panel .quiz-live-mastery-delta.is-positive{background:var(--ds-success-soft);color:var(--ds-success)}.quiz-kc-progress-panel .quiz-live-mastery-delta svg{width:14px;height:14px;padding:2px;border-radius:50%;background:transparent;color:inherit}.quiz-kc-target-block .quiz-side-target{color:var(--ds-success);font-size:24px;font-weight:600}.quiz-kc-progress-panel .quiz-progress-track{height:8px;margin-top:12px;background:var(--ds-border);border-radius:4px}.quiz-kc-progress-panel .quiz-progress-fill{background:var(--ds-success)}.quiz-kc-progress-labels{display:flex;justify-content:space-between;margin-top:8px;color:var(--ds-text-secondary);font-size:13px;font-weight:500}.quiz-kc-progress-panel .quiz-side-callout{margin:20px 0 0;padding:16px;border-radius:8px;background:var(--ds-bg);border:1px solid var(--ds-border);color:var(--ds-text-secondary);font-size:14px;line-height:1.5}.quiz-session-panel{padding:24px;border-radius:12px;border:1px solid var(--ds-border);background:var(--ds-card);box-shadow:none}.quiz-session-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:16px}.quiz-session-stats>div{display:flex;min-width:0;flex-direction:column;align-items:center;gap:4px;padding:0 12px;text-align:center;border-left:1px solid var(--ds-border)}.quiz-session-stats>div:first-child{border-left:0}.quiz-session-stats svg{color:var(--ds-text-secondary);width:16px;height:16px}.quiz-session-stats em,.quiz-session-stats span{color:var(--ds-text-secondary);font-size:12px;font-style:normal;line-height:1.25}.quiz-session-stats strong{color:var(--ds-text-main);font-size:20px;line-height:1.2;font-weight:600}.quiz-session-stats strong.is-success{color:var(--ds-success)}.quiz-session-stats strong.is-danger{color:var(--ds-danger)}.quiz-session-callout{background:var(--ds-bg);border:1px solid var(--ds-border);color:var(--ds-text-secondary);font-size:14px}.quiz-report-link-card{min-height:64px;width:100%;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:12px;padding:0 20px;border-radius:12px;border:1px solid var(--ds-border);background:var(--ds-card);color:var(--ds-text-main);font:inherit;font-size:15px;font-weight:500;text-align:left;cursor:pointer;transition:all .2s ease}.quiz-report-link-card:hover{border-color:var(--ds-primary);color:var(--ds-primary)}.quiz-mastery-click-card{width:100%;text-align:left;font:inherit;color:inherit;cursor:pointer;transition:border-color .18s ease,box-shadow .18s ease,transform .18s ease}.quiz-mastery-click-card:hover{border-color:rgba(var(--ds-primary-rgb),.34);box-shadow:0 14px 32px rgba(15,23,42,.08);transform:translateY(-1px)}.quiz-card-subtitle{margin:-2px 0 16px;color:var(--ds-text-secondary);font-size:14px;line-height:1.4}.quiz-mastery-unlock-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px}.quiz-mastery-unlock-head>div{display:flex;align-items:baseline;gap:6px;min-width:0;color:var(--ds-text-secondary);font-size:13px}.quiz-mastery-unlock-head>div:last-child{justify-content:flex-end;color:var(--ds-success)}.quiz-mastery-unlock-head strong{color:var(--ds-primary);font-size:28px;line-height:1;font-weight:850;font-variant-numeric:tabular-nums}.quiz-mastery-unlock-head>div:last-child strong{color:var(--ds-success);font-size:20px}.quiz-unlock-badge,.quiz-unlock-target-dot{display:inline-flex;align-items:center;justify-content:center;color:var(--ds-success)}.quiz-unlock-badge{width:28px;height:28px;border-radius:50%;background:var(--ds-success-soft)}.quiz-unlock-progress{position:relative;height:8px;margin-top:18px;border-radius:999px;background:var(--ds-border)}.quiz-unlock-progress-fill{width:var(--mastery-current);height:100%;border-radius:inherit;background:var(--ds-primary)}.quiz-unlock-current-dot,.quiz-unlock-target-dot{position:absolute;top:50%;transform:translate(-50%,-50%);border-radius:50%}.quiz-unlock-current-dot{left:var(--mastery-current);width:16px;height:16px;border:3px solid var(--ds-card);background:var(--ds-primary);box-shadow:0 0 0 1px rgba(var(--ds-primary-rgb),.25)}.quiz-unlock-target-dot{left:var(--mastery-target);width:24px;height:24px;border:3px solid var(--ds-card);background:var(--ds-success);color:var(--ds-card);box-shadow:0 0 0 1px rgba(34,197,94,.25)}.quiz-unlock-progress-labels{position:relative;height:18px;margin-top:6px;color:var(--ds-primary);font-size:12px;font-weight:750}.quiz-unlock-progress-labels span{position:absolute;top:0;transform:translateX(-50%);white-space:nowrap}.quiz-unlock-progress-labels span:last-child{color:var(--ds-success)}.quiz-mastery-unlock-hint{margin-top:14px;padding:14px;border:1px solid color-mix(in srgb,var(--ds-success) 20%,var(--ds-border));border-radius:8px;background:color-mix(in srgb,var(--ds-success-soft) 58%,var(--ds-card));color:var(--ds-text-secondary);font-size:13px;line-height:1.45}.quiz-live-mastery-delta--standalone{display:inline-flex;align-items:center;margin:-10px 0 0 4px}.quiz-current-kc-card{padding:22px 20px}.quiz-current-kc-body{display:flex;min-width:0;flex-direction:column;gap:10px}.quiz-current-kc-code{width:-moz-fit-content;width:fit-content;max-width:100%;padding:4px 8px;border-radius:999px;background:rgba(var(--ds-primary-rgb),.08);color:var(--ds-primary);font-size:11px;line-height:1.25;font-weight:800;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.quiz-current-kc-body h3{margin:0;color:var(--ds-text-main);font-size:16px;line-height:1.35;font-weight:800;overflow-wrap:anywhere}.quiz-current-kc-mastery{display:flex;align-items:baseline;justify-content:space-between;gap:12px;color:var(--ds-text-secondary);font-size:13px}.quiz-current-kc-mastery strong{color:var(--ds-primary);font-size:24px;line-height:1;font-weight:850;font-variant-numeric:tabular-nums}.quiz-current-kc-card .quiz-kc-mini-track span{background:var(--ds-primary)}.quiz-current-kc-body p{margin:0;color:var(--ds-text-secondary);font-size:13px;line-height:1.45}.quiz-current-kc-radar-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:42px;margin-top:8px;border:1px solid var(--ds-border);border-radius:8px;background:var(--ds-card);color:var(--ds-primary);font:inherit;font-size:14px;font-weight:800;cursor:pointer;transition:border-color .18s ease,background .18s ease,box-shadow .18s ease}.quiz-current-kc-radar-btn:hover{border-color:rgba(var(--ds-primary-rgb),.3);background:rgba(var(--ds-primary-rgb),.04);box-shadow:0 8px 20px rgba(15,23,42,.06)}.quiz-kc-mastery-list{gap:10px}.quiz-kc-mastery-list,.quiz-kc-mastery-row{display:flex;flex-direction:column;min-width:0}.quiz-kc-mastery-row{gap:7px;padding:9px 10px;border-left:3px solid transparent;border-radius:8px}.quiz-kc-mastery-row.is-current{border-left-color:var(--kc-color);background:color-mix(in srgb,var(--kc-color) 10%,var(--ds-card))}.quiz-kc-mastery-topline{display:flex;align-items:center;gap:8px;min-width:0}.quiz-kc-mastery-dot{flex:0 0 auto;width:9px;height:9px;border-radius:50%;background:var(--kc-color)}.quiz-kc-mastery-name{display:block;flex:1 1 auto;min-width:0;color:var(--ds-text-main);font-size:13px;line-height:1.25;font-weight:650;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.quiz-kc-modal-summary .quiz-kc-mastery-name{overflow:visible;text-overflow:clip;white-space:normal;overflow-wrap:anywhere}.quiz-kc-current-badge{flex:0 0 auto;padding:3px 7px;border-radius:999px;background:color-mix(in srgb,var(--kc-color) 16%,var(--ds-card));color:var(--kc-color);font-size:10px;font-weight:800;line-height:1.2}.quiz-kc-mini-track{height:5px;border-radius:999px;background:var(--ds-border);overflow:hidden}.quiz-kc-mini-track span{display:block;height:100%;border-radius:inherit;background:var(--kc-color)}.quiz-kc-mastery-value{flex:0 0 auto;color:var(--kc-color);font-size:13px;font-weight:850;font-variant-numeric:tabular-nums}.quiz-kc-mastery-track{width:calc(100% - 17px);margin-left:17px}.quiz-unlock-experiment-note{display:flex;align-items:flex-start;gap:10px;padding:0 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