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var(--line);background:var(--surface-soft);color:var(--text);font-size:var(--text-sm);font-weight:700;padding:8px 10px}.quick-toggle-toolbar{display:flex;gap:8px;flex-wrap:wrap}.quick-toggle-mini{width:auto;min-width:110px;padding:8px 12px;border-radius:var(--radius-full)}.quick-toggle-list{display:grid;gap:8px}.parent-quick-toggle-list{grid-template-columns:repeat(2,minmax(0,1fr))}.quick-toggle-item{display:grid;gap:8px;border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface-alt);padding:8px}.quick-toggle-label{font-size:var(--text-md);font-weight:700;color:var(--text);line-height:1.45}.quick-toggle-btn{justify-self:start;width:auto;min-width:70px;border-radius:var(--radius-full);font-size:var(--text-sm);padding:8px 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#0071e31f}.message-role{text-transform:capitalize}.message-date{color:var(--muted)}.grid{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}.app-card-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.app-card{text-align:left;display:grid;gap:8px;min-height:94px;align-content:center;padding:14px}.app-card-panel{min-height:188px;align-content:start;gap:12px}.app-card-title{font-size:var(--text-lg);font-weight:700;color:var(--text)}.app-card-sub{font-size:var(--text-sm);color:var(--muted)}.app-card-actions{display:grid;gap:9px;margin-top:4px}.app-card-button{min-height:50px;font-size:var(--text-base);border-radius:var(--radius-lg)}.subject-card{border-color:var(--subject-line)!important;background:linear-gradient(180deg,var(--subject-soft),var(--surface))!important;box-shadow:0 1px 3px #0000000f!important}.subject-pill{display:inline-flex;width:fit-content;font-size:var(--text-2xs);font-weight:700;border-radius:var(--radius-full);padding:4px 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var(--subject-line);background:var(--subject-soft);color:var(--subject-contrast);padding:10px;font-weight:700}.practice-result{border-radius:var(--radius-md);border:2px solid;padding:12px;display:grid;gap:5px}.practice-result.correct{border-color:var(--color-success-border);background:var(--color-success-bg);color:var(--color-success)}.practice-result.wrong{border-color:var(--color-error-border);background:var(--color-error-bg);color:var(--color-error)}.practice-support-card{border:1px solid var(--subject-line);border-radius:var(--radius-md);background:linear-gradient(180deg,var(--subject-soft),var(--surface-alt));color:var(--subject-contrast);padding:12px;display:grid;gap:8px}.practice-support-list{margin:0;padding-left:18px;display:grid;gap:6px}.practice-support-list li{line-height:1.5}.practice-support-challenge{border:1px solid var(--line);border-radius:var(--radius-md);padding:8px 10px;background:var(--surface-soft)}.chat-shell{max-width:1540px;margin:0 auto}.chat-focus-shell{max-width:980px;color:var(--text);background:var(--bg);border-radius:var(--radius-xl)}.chat-focus-shell .section{background:var(--surface);border-color:var(--line);box-shadow:var(--shadow-md)}.chat-focus-shell .page-eyebrow{color:var(--subject-accent-press)}.chat-focus-shell .ghost-btn.is-active,.chat-focus-shell .chat-send-btn{color:#fff;border-color:var(--subject-accent-press);background:linear-gradient(180deg,var(--subject-accent),var(--subject-accent-press));box-shadow:var(--shadow-sm)}.chat-focus-shell .chat-top-menu-body,.chat-focus-shell .chat-composer-box{background:var(--surface-alt);border-color:var(--line)}.chat-focus-shell .chat-answer-style,.chat-focus-shell .child-accordion{background:var(--surface-soft)}.chat-focus-shell .chat-assistant{border-color:var(--line);background:var(--surface-alt);color:var(--text)}.chat-focus-shell .chat-user{border-color:var(--subject-accent-press);border-bottom-color:var(--subject-accent-press);background:linear-gradient(180deg,var(--subject-accent),var(--subject-accent-press));color:#fff}.chat-focus-main{display:grid;gap:12px;align-content:start}.chat-focus-header{display:grid;gap:12px;padding:16px}.chat-focus-title{display:grid;gap:5px}.chat-focus-nav{display:grid;gap:8px;grid-template-columns:repeat(4,minmax(0,1fr))}.chat-focus-nav-simple{grid-template-columns:minmax(0,1fr) auto;align-items:start}.chat-top-menu{position:relative}.chat-top-menu summary{list-style:none;cursor:pointer}.chat-top-menu summary::-webkit-details-marker{display:none}.chat-top-menu-body{position:absolute;right:0;z-index:10;margin-top:8px;min-width:180px;padding:10px;border:1px solid var(--line-soft);border-radius:var(--radius-lg);background:var(--surface-alt);box-shadow:var(--shadow-card);display:grid;gap:8px}.chat-top-menu-body .ghost-btn{width:100%}.chat-focus-nav.has-quiz{grid-template-columns:repeat(5,minmax(0,1fr))}.chat-focus-nav .ghost-btn{min-height:44px}.quiz-start-card,.quiz-stage-card,.quiz-feedback-card,.quiz-summary-card{display:grid;gap:14px}.quiz-start-hero,.quiz-summary-hero{display:grid;gap:8px;justify-items:start}.quiz-start-badge,.quiz-difficulty-pill,.quiz-feedback-streak,.quiz-summary-badge{display:inline-flex;width:fit-content;align-items:center;justify-content:center;border-radius:var(--radius-full);font-weight:700}.quiz-start-badge{padding:6px 12px;background:var(--subject-soft);border:1px solid var(--subject-line);color:var(--subject-contrast);font-size:var(--text-sm)}.quiz-stage-title{font-size:clamp(1.5rem,3vw,2.2rem);line-height:1.15;letter-spacing:.01em}.quiz-stat-grid{display:grid;gap:10px;grid-template-columns:repeat(2,minmax(0,1fr))}.quiz-collection-grid,.quiz-level-grid,.quiz-mode-grid{display:grid;gap:10px}.quiz-collection-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.quiz-level-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.quiz-mode-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.quiz-collection-card,.quiz-level-card,.quiz-mode-card{display:grid;gap:8px;width:100%;text-align:left;align-content:start;border-radius:var(--radius-lg);border:1px solid var(--line);background:var(--surface-alt);box-shadow:none}.quiz-collection-card strong,.quiz-level-card strong,.quiz-mode-card strong{font-size:var(--text-base)}.quiz-collection-card span,.quiz-level-card span,.quiz-mode-card span,.quiz-collection-card small,.quiz-level-card 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span{font-size:var(--text-xl);font-weight:700;color:var(--text)}.quiz-timer-ring{position:relative;width:64px;height:64px;flex-shrink:0}.quiz-timer-svg{width:64px;height:64px;transform:rotate(-90deg)}.quiz-timer-track,.quiz-timer-progress{fill:none;stroke-width:2.5}.quiz-timer-track{stroke:#00000014}.quiz-timer-progress{stroke:var(--subject-accent);stroke-linecap:round;transition:stroke-dashoffset 1s linear,stroke .14s ease}.quiz-timer-progress.is-urgent{stroke:var(--color-error-strong)}.quiz-timer-ring span{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:var(--text-base);font-weight:700}.quiz-timer-ring span.is-urgent{color:var(--color-error-strong);animation:quizTimerPulse .7s ease infinite alternate}.quiz-stage-metrics{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--subject-contrast);font-size:var(--text-base)}.quiz-stage-metrics strong{color:var(--text)}.quiz-word-card{display:grid;gap:12px;justify-items:center;text-align:center;padding:22px 18px;border-radius:var(--radius-lg);background:var(--subject-soft);border:1px solid var(--subject-line)}.quiz-question-prompt{margin:0;font-size:var(--text-base);color:var(--muted)}.quiz-question-hint{margin:0;font-size:var(--text-md);color:var(--muted)}.quiz-word-card h2{font-size:clamp(2rem,5vw,3.2rem);line-height:1.05;letter-spacing:.02em}.quiz-difficulty-pill{padding:4px 10px;background:#0000000a;border:1px solid var(--line);color:var(--subject-contrast);text-transform:uppercase;font-size:var(--text-2xs);letter-spacing:.08em}.quiz-choice-grid{display:grid;gap:10px;grid-template-columns:repeat(2,minmax(0,1fr))}.quiz-choice-btn{min-height:72px;border-color:var(--subject-line);background:var(--surface-alt);color:var(--text);box-shadow:0 1px 2px #0000000f;font-size:var(--text-base);font-weight:700}.quiz-choice-btn:not(:disabled):active{box-shadow:none}.quiz-feedback-card{justify-items:center;text-align:center;cursor:pointer}.quiz-feedback-card.is-correct{border-color:var(--color-success-border);background:var(--color-success-bg)}.quiz-feedback-card.is-wrong{border-color:var(--color-error-border);background:var(--color-error-bg)}.quiz-feedback-icon{font-size:var(--text-display);line-height:1}.quiz-feedback-word{font-size:clamp(2rem,5vw,3rem);font-weight:700;line-height:1.05}.quiz-feedback-answer{font-size:var(--text-lg);color:var(--subject-contrast)}.quiz-feedback-note{color:var(--muted);font-size:var(--text-base)}.quiz-feedback-meta{display:grid;gap:4px;justify-items:center;color:var(--subject-contrast);font-size:var(--text-base)}.quiz-feedback-meta strong{color:var(--text)}.quiz-feedback-example{display:grid;gap:6px;max-width:34rem;padding:14px 16px;border-radius:var(--radius-lg);background:var(--surface-soft);border:1px solid var(--line)}.quiz-feedback-example strong{font-size:var(--text-base)}.quiz-feedback-example p,.quiz-feedback-example small{color:var(--muted)}.quiz-feedback-streak{gap:10px;padding:8px 14px;background:var(--surface-soft);border:1px solid var(--line);color:var(--subject-contrast)}.quiz-feedback-streak strong{font-size:var(--text-lg);color:var(--text)}.quiz-speak-btn{width:auto;min-width:0;justify-self:center;padding-inline:18px}.quiz-summary-list{display:grid;gap:10px}.quiz-summary-tags{display:flex;flex-wrap:wrap;gap:8px}.quiz-summary-tag{display:inline-flex;align-items:center;justify-content:center;width:fit-content;padding:6px 12px;border-radius:var(--radius-full);background:var(--subject-soft);border:1px solid var(--subject-line);color:var(--subject-contrast);font-size:var(--text-sm);font-weight:700}.quiz-summary-row{display:grid;gap:12px;grid-template-columns:minmax(0,1fr) auto;align-items:center;padding:14px 16px;border-radius:var(--radius-lg);background:var(--surface-soft);border:1px solid var(--line-soft)}.quiz-summary-wording{display:grid;gap:4px}.quiz-summary-wording strong{font-size:var(--text-base)}.quiz-summary-wording span,.quiz-summary-wording small{color:var(--muted)}.quiz-summary-badge{padding:8px 12px;font-size:var(--text-sm)}.quiz-summary-badge.is-correct{background:var(--color-success-bg);color:var(--color-success);border:1px solid var(--color-success-border)}.quiz-summary-badge.is-wrong{background:var(--color-error-bg);color:var(--color-error);border:1px solid var(--color-error-border)}@keyframes quizTimerPulse{0%{transform:scale(1)}to{transform:scale(1.06)}}.duo-frame{display:grid;gap:24px;grid-template-columns:256px minmax(580px,1fr) 368px}.duo-sidebar{position:sticky;top:16px;height:calc(100vh - 32px);display:grid;grid-template-rows:auto 1fr 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transparent;box-shadow:none;background:transparent;color:var(--muted);display:flex;align-items:center;gap:10px;text-align:left;padding:10px 12px;font-size:var(--text-base)}.duo-nav-item:hover{border-color:var(--line);background:#0000000a;transform:none}.duo-nav-item.active{border-color:var(--subject-line);background:var(--subject-soft);color:var(--text)}.duo-nav-icon{width:20px;height:20px;flex:none}.duo-action-icon{width:18px;height:18px;flex:none}.duo-upload-btn{min-height:52px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;gap:8px;background:linear-gradient(180deg,var(--subject-accent),var(--subject-accent-press));border-color:var(--subject-accent-press);box-shadow:0 1px 3px #0000001f}.duo-upload-btn:not(:disabled):active{box-shadow:none}.duo-main{min-width:0;display:grid;gap:12px;align-content:start}.duo-stage{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:10px 12px}.duo-stage-chip{font-size:var(--text-xs);font-weight:700;letter-spacing:.07em;color:var(--muted)}.duo-stage-track{height:14px;border-radius:var(--radius-full);overflow:hidden;border:1px solid var(--line);background:#0000000f}.duo-stage-track i{display:block;height:100%;border-radius:var(--radius-full);background:linear-gradient(90deg,var(--subject-accent),var(--subject-accent-press))}.duo-stage-xp{font-size:var(--text-sm);color:var(--subject-contrast);font-weight:700}.duo-quest{display:grid;gap:8px;padding:18px}.duo-quest-top{display:flex;align-items:center;gap:8px}.duo-quest-icon{width:20px;height:20px;color:var(--subject-contrast)}.duo-quest-title{font-size:var(--text-xl);letter-spacing:.01em}.duo-quest-copy{color:var(--muted);font-size:var(--text-base);line-height:1.6}.duo-path{display:grid;gap:12px}.duo-path-title{font-size:var(--text-sm);font-weight:700;color:var(--muted)}.duo-path-row{display:flex;justify-content:space-between;gap:10px}.duo-node{position:relative;width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-weight:700;color:var(--muted);border:1px solid var(--line);background:var(--surface-alt);box-shadow:0 1px 3px #00000014;transition:transform .15s ease}.duo-node.done{border-color:var(--subject-accent-press);background:linear-gradient(180deg,var(--subject-accent),var(--subject-accent-press));color:#fff;box-shadow:0 2px 8px #0000001f}.duo-node.now{border-color:var(--subject-line);color:var(--text);animation:nodePulse 1.6s ease-in-out infinite}.duo-node-check{width:22px;height:22px}.chat-log{min-height:clamp(340px,52vh,640px);max-height:clamp(380px,66vh,760px);overflow:auto;display:flex;flex-direction:column;gap:10px;padding:14px}.chat-bubble{width:min(86%,720px);border-radius:var(--radius-lg);border:1px solid;padding:10px 12px;animation:bubbleIn .22s ease}.chat-role{font-size:var(--text-2xs);font-weight:700;margin-bottom:5px}.chat-content{white-space:pre-wrap;word-break:break-word;line-height:1.55;min-height:18px}.chat-time{margin-top:8px;font-size:var(--text-2xs);text-align:right;opacity:.85}.chat-assistant{align-self:flex-start;background:var(--surface-alt);border:1px solid var(--line);color:var(--text);border-radius:12px 12px 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