.demo-quiz-slot{height:524px}.demo-quiz-intro{max-width:1100px;margin:0 auto;padding:0 4px 2px;text-align:center;font-family:var(--font-sans);font-weight:600;font-size:14px;letter-spacing:0;color:hsl(var(--foreground))}@media(max-width:720px){.demo-quiz-intro{font-size:12px;line-height:1.4}}@media(max-width:720px){.demo-quiz-slot{height:auto;min-height:520px}}.demo-quiz-shell{position:relative;width:100%;max-width:none;margin:0 auto;border-radius:12px;overflow:hidden;border:2px solid var(--color-primary, #3498db);background:hsl(var(--background))}.demo-submit-btn{padding:7px 20px;border-radius:9999px;font-size:12px;font-weight:600;background:hsl(var(--primary));color:hsl(var(--primary-foreground));border:none;cursor:pointer;box-shadow:none;transition:background-color .2s ease,transform .25s cubic-bezier(.16,1,.3,1)}.demo-submit-btn:hover:not(:disabled){background:hsl(var(--primary) / .92);box-shadow:none}.demo-submit-btn:active:not(:disabled){transform:translateY(1px) scale(.985)}.demo-submit-btn:disabled{background:hsl(var(--muted));color:hsl(var(--muted-foreground));opacity:1;cursor:not-allowed;box-shadow:none}.demo-submit-wrapper{text-align:center;margin-top:12px}.demo-inline-submit{margin-top:12px;padding:8px 16px;border-radius:999px;font-size:var(--fs-small);font-weight:600;background:hsl(var(--primary));color:#fff;border:none;cursor:pointer;transition:background .15s}.demo-inline-submit:hover:not(:disabled){background:hsl(var(--primary) / .92)}.demo-inline-submit:disabled{background:hsl(var(--muted));color:hsl(var(--muted-foreground));opacity:1;cursor:not-allowed}.question-image-container{position:relative}.demo-audio-player{display:flex;align-items:center;gap:14px;padding:2px 0;background:transparent;border-radius:0;margin-bottom:12px}.demo-audio-player audio{display:none}.demo-play-button{width:40px;height:40px;border-radius:50%;background:hsl(var(--foreground));color:hsl(var(--background));border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s;flex-shrink:0}.demo-play-button:hover:not(:disabled){background:hsl(var(--foreground) / .85)}.demo-play-button.disabled{background:hsl(var(--muted));color:hsl(var(--muted-foreground));cursor:default}.demo-audio-info{flex:1;min-width:0;display:flex;flex-direction:column;gap:7px}.demo-audio-meta{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.demo-audio-label{font-size:var(--fs-small);font-weight:600;color:hsl(var(--foreground))}.demo-audio-progress-bar{height:4px;background:hsl(var(--foreground) / .12);border-radius:2px;overflow:hidden}.demo-audio-progress-fill{height:100%;background:hsl(var(--foreground));border-radius:2px;transition:width .1s linear}.demo-audio-time{font-size:12px;color:hsl(var(--muted-foreground));font-family:var(--font-sans);font-variant-numeric:tabular-nums}@media(max-width:768px){.demo-quiz-slot{min-height:868px}}.demo-quiz-shell{border-radius:var(--radius-surface)!important;border:none!important;background:hsl(var(--background))!important;box-shadow:none!important}.demo-submit-btn.demo-inline-submit{border-radius:999px!important;border:1px solid hsl(var(--action))!important;background:hsl(var(--action))!important;color:hsl(var(--primary-foreground))!important;font-family:var(--font-sans)!important;font-weight:600!important;letter-spacing:0!important}.demo-submit-btn.demo-inline-submit:disabled{background:hsl(var(--muted))!important;color:hsl(var(--muted-foreground))!important;opacity:1!important;cursor:not-allowed!important}.demo-quiz-shell.adaptive{padding-bottom:0;height:100%;box-sizing:border-box;display:flex;flex-direction:column}.demo-quiz-shell.adaptive{--demo-well: color-mix(in srgb, hsl(var(--foreground)) 10%, white)}.adaptive-start-pad{padding:60px 24px 56px;display:flex;justify-content:center}.adaptive-start-btn{font-family:var(--font-sans);font-weight:600;font-size:var(--fs-body);letter-spacing:0;padding:14px 32px;border-radius:999px;border:1.5px solid hsl(var(--action));background:hsl(var(--action));color:hsl(var(--primary-foreground));cursor:pointer;transition:transform .12s ease,opacity .12s ease}.adaptive-start-btn:hover{transform:translateY(-1px);opacity:.92}.adaptive-loading{padding:80px 24px;text-align:center;color:hsl(var(--muted-foreground));font-family:var(--font-sans)}.adaptive-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 20px 0;font-family:var(--font-sans)}.adaptive-header-left{display:flex;align-items:center;gap:8px;min-width:0;flex-wrap:wrap}.adaptive-module-pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;background:var(--demo-well, 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.question-image{width:auto;height:100%;max-width:100%;-o-object-fit:contain;object-fit:contain;display:block}.adaptive-image-hint{position:absolute;right:6px;bottom:6px;display:inline-flex;align-items:center;gap:4px;padding:3px 8px;border-radius:6px;font-size:var(--fs-micro);line-height:1.3;color:hsl(var(--muted-foreground));background:hsl(var(--background) / .86);backdrop-filter:blur(2px);pointer-events:none;white-space:nowrap}.adaptive-image-hint-icon{flex-shrink:0;width:12px;height:12px}.adaptive-question-text{font-family:var(--font-sans);font-size:var(--fs-body);font-weight:600;line-height:1.47;color:hsl(var(--foreground));margin:6px 0 8px}.adaptive-question .options-container{display:flex;flex-direction:column;gap:6px;margin-top:8px}.adaptive-question .option-item{display:flex;align-items:center;width:100%;padding:7px 14px;font-size:var(--fs-small);line-height:1.4}.adaptive-question.reading .adaptive-question-text{margin:12px 0 10px}.adaptive-question.reading .options-container{margin-top:12px}@media(max-width:720px){.adaptive-question .option-item{padding:12px 16px;font-size:var(--fs-body)}.adaptive-question.reading .question-image-container{height:200px}}.adaptive-question .demo-submit-wrapper{margin-top:12px;padding-top:0;border-top:none;display:flex;justify-content:flex-end}.adaptive-question .demo-inline-submit{margin-top:0;padding:6px 14px;min-height:32px;font-size:var(--fs-small)}.adaptive-question.listening .demo-audio-player{padding:2px 0;height:200px;align-items:center;margin-bottom:14px;gap:14px}.adaptive-question.listening .demo-play-button{width:42px;height:42px;font-size:var(--fs-body)}.adaptive-question.listening .demo-audio-label{font-size:var(--fs-caption)}.adaptive-question.listening .demo-audio-progress-bar{height:4px}.adaptive-question.listening .demo-audio-time{font-size:var(--fs-micro)}.adaptive-question.listening .adaptive-question-text{margin:12px 0 10px}.adaptive-question.listening .options-container{gap:6px;margin-top:12px}.adaptive-question.listening .demo-submit-wrapper{margin-top:12px;padding-top:0}@media(max-width:720px){.adaptive-question.listening .demo-audio-player{padding:2px 0;height:200px;margin-bottom:14px;gap:12px}.adaptive-question.listening .demo-play-button{width:44px;height:44px;font-size:var(--fs-body)}.adaptive-question.listening .adaptive-question-text{margin:12px 0 8px}.adaptive-question.listening .options-container{margin-top:12px}.adaptive-question.listening .demo-submit-wrapper{margin-top:10px;padding-top:0}}.adaptive-layout{display:grid;grid-template-columns:132px minmax(0,1fr) 400px;grid-template-rows:1fr;border-top:none;height:100%;overflow:hidden}@media(max-width:1024px){.adaptive-layout{grid-template-columns:132px minmax(0,1fr)}.adaptive-analysis-rail{grid-column:1 / -1;border-left:0;border-top:none}}@media(max-width:720px){.adaptive-layout{grid-template-columns:1fr;grid-template-rows:auto auto auto;height:auto;overflow:visible}.adaptive-content{overflow:visible}.adaptive-scroll{overflow-y:visible}.adaptive-analysis-rail{overflow-y:visible;min-height:100%}}.adaptive-content{display:flex;flex-direction:column;min-width:0;min-height:0;overflow:hidden}.adaptive-scroll{flex:1 1 auto;overflow-y:auto;min-height:0}.adaptive-nav-left{border-right:none;padding:18px 14px;display:flex;flex-direction:column;gap:22px;background:color-mix(in srgb,hsl(var(--primary)) 6%,white)}@media(max-width:720px){.adaptive-nav-left{border-right:none;border-bottom:none;flex-direction:row;gap:14px;padding:12px 16px}}.adaptive-nav-section{display:flex;flex-direction:column;gap:8px}@media(max-width:720px){.adaptive-nav-section{flex:1 1 0}}.adaptive-nav-section-label{font-family:var(--font-sans);font-size:var(--fs-micro);font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:hsl(var(--muted-foreground))}.adaptive-nav-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:6px}@media(max-width:720px){.adaptive-nav-list{flex-direction:row;gap:4px}}.adaptive-nav-item{display:flex}@media(max-width:720px){.adaptive-nav-item{flex:1 1 0}}.adaptive-nav-item-btn{display:flex;align-items:center;justify-content:space-between;width:100%;padding:7px 10px;font-family:var(--font-sans);font-size:var(--fs-micro);font-weight:600;letter-spacing:0;border-radius:8px;border:none;background:hsl(var(--background));color:hsl(var(--foreground));transition:background .15s ease,color .15s ease}@media(max-width:720px){.adaptive-nav-item-btn{justify-content:center;padding:12px 4px;min-height:44px}}.adaptive-nav-item-mark{font-size:var(--fs-caption);margin-left:6px}@media(max-width:720px){.adaptive-nav-item-mark{margin-left:4px}}.adaptive-nav-item--correct .adaptive-nav-item-btn{color:var(--tcf-green-text);background:color-mix(in srgb,var(--tcf-green) 12%,white)}.adaptive-nav-item--wrong .adaptive-nav-item-btn{color:hsl(var(--red-data));background:color-mix(in srgb,hsl(var(--red-data)) 12%,white)}.adaptive-nav-item--wrong:not(.adaptive-nav-item--current) .adaptive-nav-item-mark{color:hsl(var(--red-data));font-weight:600}.adaptive-nav-item--current .adaptive-nav-item-btn{color:hsl(var(--link));font-weight:600;background:color-mix(in srgb,hsl(var(--primary)) 17%,white)}.adaptive-nav-item--current.adaptive-nav-item--correct .adaptive-nav-item-btn{background:color-mix(in srgb,hsl(var(--primary)) 17%,white);color:hsl(var(--link))}.adaptive-nav-item--current.adaptive-nav-item--correct .adaptive-nav-item-mark{color:var(--tcf-green-text)}.adaptive-nav-item-btn:not(:disabled){cursor:pointer}.adaptive-nav-item-btn:not(:disabled):hover{opacity:.85;background:var(--demo-well, hsl(var(--muted)))}.adaptive-nav-item-btn:disabled{cursor:not-allowed;opacity:.55}.adaptive-nav-item--reviewing .adaptive-nav-item-btn{outline:2px solid hsl(var(--foreground));outline-offset:-2px;background:hsl(var(--muted) / .7);font-weight:600}.adaptive-analysis-rail{border-left:none;background:hsl(var(--card));padding:18px 18px 24px;min-height:0;overflow-y:auto;font-family:var(--font-sans)}.adaptive-analysis-placeholder{font-size:var(--fs-caption);line-height:1.55;color:hsl(var(--muted-foreground));padding:8px 4px}.adaptive-analysis{display:flex;flex-direction:column;gap:12px}.adaptive-analysis-title{font-family:var(--font-sans);font-size:var(--fs-micro);font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:hsl(var(--foreground));padding-bottom:0}.adaptive-analysis-loading,.adaptive-analysis-error{font-size:var(--fs-caption);color:hsl(var(--muted-foreground));padding:8px 0}.adaptive-analysis-immersive{display:flex;flex-direction:column;gap:14px}.adaptive-analysis-line{display:flex;flex-direction:column;gap:4px;padding:8px 10px;border-radius:8px;background:color-mix(in srgb,var(--tc, hsl(var(--primary))) 9%,white);border-left:2px solid transparent}.adaptive-analysis-line.key{background:color-mix(in srgb,var(--tc, hsl(var(--primary))) 16%,white);border-left-color:var(--tc-text, hsl(var(--primary)))}.adaptive-analysis-original{font-size:var(--fs-caption);font-weight:600;line-height:1.5;color:hsl(var(--foreground))}.adaptive-analysis-translation{font-size:var(--fs-caption);line-height:1.5;color:hsl(var(--foreground))}.adaptive-analysis-annotation{font-size:var(--fs-caption);line-height:1.55;color:hsl(var(--foreground));padding-top:0;margin-top:8px}.adaptive-analysis-annotation strong,.adaptive-analysis-annotation b{color:var(--tc-text, hsl(var(--primary)))}.option-item--locked{cursor:default}.adaptive-question .option-item{border:none!important;background:color-mix(in srgb,hsl(var(--primary)) 6%,white)!important}.adaptive-question .option-item:not(.option-item--locked):hover{background:color-mix(in srgb,hsl(var(--primary)) 30%,white)!important;border-color:transparent!important}.adaptive-question .option-item.selected{background:color-mix(in srgb,hsl(var(--primary)) 30%,white)!important;border-color:transparent!important}.adaptive-question .option-item.correct,.option-item--correct{border-color:transparent!important;background:color-mix(in srgb,var(--tcf-green) 12%,white)!important}.demo-quiz-shell .option-radio{position:absolute;width:1px;height:1px;padding:0;margin:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}.demo-quiz-shell .option-radio-indicator{position:relative;flex-shrink:0;width:18px;height:18px;border:1.5px solid hsl(var(--muted-foreground));border-radius:9999px;transition:border-color .15s ease}.demo-quiz-shell .option-radio-indicator:after{content:"";position:absolute;inset:0;margin:auto;width:8px;height:8px;border-radius:9999px;background:hsl(var(--primary));transform:scale(0);transition:transform .15s ease}.demo-quiz-shell .option-radio:checked+.option-radio-indicator{border-color:hsl(var(--primary))}.demo-quiz-shell .option-radio:checked+.option-radio-indicator:after{transform:scale(1)}.demo-quiz-shell .option-radio:focus-visible+.option-radio-indicator{outline:2px solid hsl(var(--link));outline-offset:2px}.demo-quiz-shell .option-item--correct .option-radio:checked+.option-radio-indicator{border-color:var(--tcf-green)}.demo-quiz-shell .option-item--wrong .option-radio:checked+.option-radio-indicator{border-color:hsl(var(--red-data))}.demo-quiz-shell .option-item--locked .option-radio-indicator{opacity:.55}.adaptive-question .option-item.correct .option-radio,.option-item--correct .option-radio{accent-color:var(--tcf-green)}.adaptive-question .option-item.incorrect,.option-item--wrong{border-color:transparent!important;background:color-mix(in srgb,hsl(var(--primary)) 6%,white)!important}.adaptive-question .option-item.incorrect .option-radio,.option-item--wrong .option-radio{accent-color:hsl(var(--red-data))}.demo-quiz-shell .option-badge{margin-left:auto;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;font-size:14px;font-weight:600;line-height:1}.demo-quiz-shell .option-badge--correct{color:var(--tcf-green-text)}.demo-quiz-shell .option-badge--wrong{color:hsl(var(--red-data))}.demo-quiz-shell .option-label{font-family:var(--font-sans);font-size:var(--fs-small);font-weight:600;color:hsl(var(--foreground));letter-spacing:0}.demo-quiz-shell .option-text{font-size:var(--fs-small);line-height:1.47;color:hsl(var(--foreground))}@media(max-width:720px){.demo-quiz-shell .option-label,.demo-quiz-shell .option-text{font-size:var(--fs-body)}}.adaptive-demo-result{padding:36px 28px 32px;font-family:var(--font-sans)}.adr-title{font-family:var(--font-sans);font-weight:600;font-size:var(--fs-title);letter-spacing:.011em;margin:0 0 24px;text-align:center;color:hsl(var(--foreground))}:lang(zh) .adr-title{letter-spacing:0}.adr-modules{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:24px}@media(max-width:600px){.adr-modules{grid-template-columns:1fr}}.adr-module{border-radius:12px;border:none;background:var(--demo-well, 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0;font-family:var(--font-sans)}.adr-link{background:transparent;border:0;padding:4px 2px;font-family:var(--font-sans);font-size:var(--fs-caption);font-weight:600;color:hsl(var(--muted-foreground));cursor:pointer;text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;transition:color .12s ease}.adr-link:hover{color:hsl(var(--foreground))}.demo-img-zoom-trigger{background:none;border:none;padding:0;cursor:zoom-in;display:block;width:100%;text-align:inherit}.demo-img-zoom-trigger:focus-visible{outline:2px solid hsl(var(--primary));outline-offset:2px}.demo-img-zoom-backdrop{position:fixed;inset:0;background:var(--modal-scrim);z-index:9000;display:flex;align-items:center;justify-content:center;cursor:zoom-out;padding:24px;animation:demoImgZoomFadeIn .18s ease-out}@keyframes demoImgZoomFadeIn{0%{opacity:0}to{opacity:1}}.demo-img-zoom-image{max-width:min(90vw,720px);max-height:85vh;-o-object-fit:contain;object-fit:contain;cursor:default;display:block;background:#fff;box-shadow:var(--modal-shadow)}.demo-img-zoom-close{position:fixed;top:20px;right:24px;width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:#fffffff2;border:none;border-radius:50%;cursor:pointer;color:hsl(var(--foreground));z-index:9001;transition:background .15s,transform .15s}.demo-img-zoom-close:hover{background:#fff}.demo-img-zoom-close:focus-visible{outline:2px solid hsl(var(--primary));outline-offset:2px}@media(max-width:720px){.adaptive-question .demo-inline-submit{font-size:var(--fs-small);min-height:44px}.adaptive-nav-section-label{font-size:var(--fs-micro)}.adaptive-header{padding:10px 16px 0}.adaptive-analysis-translation,.adaptive-analysis-annotation{font-size:var(--fs-caption)}}