@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap";.global-nav{background-color:var(--color-canvas);border-bottom:1px solid var(--color-divider-soft);z-index:200;-webkit-font-smoothing:antialiased;height:44px;transition:transform var(--transition-normal);position:fixed;top:0;left:0;right:0}.global-nav.hidden{transform:translateY(-100%)}.global-nav-inner{justify-content:space-between;align-items:center;max-width:1440px;height:100%;margin:0 auto;padding:0 20px;display:flex}.global-nav-left{align-items:center;gap:24px;height:100%;display:flex}.nav-logo{color:var(--color-primary);font-size:var(--text-nav);font-weight:var(--weight-bold);letter-spacing:var(--tracking-nav);line-height:var(--leading-nav);transition:opacity var(--transition-fast);align-items:center;gap:6px;text-decoration:none;display:flex}.nav-logo:hover{opacity:.8;color:var(--color-primary)}.nav-links-desktop{align-items:center;gap:4px;height:100%;display:flex}.nav-link{height:100%;font-size:var(--text-nav);font-weight:var(--weight-regular);letter-spacing:var(--tracking-nav);color:var(--color-ink-muted-48);transition:color var(--transition-fast);white-space:nowrap;align-items:center;padding:0 14px;text-decoration:none;display:flex}.nav-link:hover{color:var(--color-ink)}.nav-link.active{color:var(--color-primary);font-weight:var(--weight-semibold)}.global-nav-right,.nav-user{align-items:center;gap:8px;display:flex}.nav-user-name{font-size:var(--text-nav);color:var(--color-ink-muted-48);text-overflow:ellipsis;white-space:nowrap;max-width:120px;overflow:hidden}.nav-icon-btn{border-radius:var(--radius-sm);width:28px;height:28px;color:var(--color-ink-muted-48);transition:color var(--transition-fast);background:0 0;justify-content:center;align-items:center;display:flex}.nav-icon-btn:hover{color:var(--color-primary)}.hamburger{border-radius:var(--radius-sm);width:28px;height:28px;color:var(--color-ink-muted-48);background:0 0;border:none;justify-content:center;align-items:center;display:none}.hamburger:hover{color:var(--color-ink)}.nav-drawer{background:var(--color-canvas);z-index:199;border-top:1px solid var(--color-divider-soft);padding:16px;display:none;position:fixed;inset:44px 0 0;overflow-y:auto}.nav-drawer.open{display:block}.global-nav.hidden~.nav-drawer{top:0}.nav-drawer-links{flex-direction:column;gap:2px;display:flex}.drawer-link{font-size:var(--text-body);font-weight:var(--weight-regular);color:var(--color-ink);border-radius:var(--radius-sm);transition:background var(--transition-fast), color var(--transition-fast);text-align:left;cursor:pointer;background:0 0;border:none;align-items:center;gap:12px;width:100%;padding:12px 16px;font-family:inherit;text-decoration:none;display:flex}.drawer-link:hover,.drawer-link.active{background:var(--color-notes-orange-tint);color:var(--color-primary)}.drawer-login{border-top:1px solid var(--color-divider-soft);margin-top:8px;padding-top:16px}.main-content{min-height:calc(100vh - 44px);margin-top:44px}@media (width<=834px){.nav-links-desktop{display:none}.hamburger{display:flex}.nav-user-name{display:none}}@media (width>=835px){.nav-drawer{display:none!important}}.ai-chat-container{z-index:100;flex-direction:column;align-items:flex-end;display:flex;position:fixed;bottom:24px;right:24px}.chat-bubble-btn{border-radius:var(--radius-full);background:var(--color-primary);color:#fff;width:52px;height:52px;box-shadow:var(--shadow-product);transition:transform var(--transition-fast);justify-content:center;align-items:center;display:flex}.chat-bubble-btn:hover{background:var(--color-primary-focus);transform:scale(1.05)}.chat-window{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);flex-direction:column;width:380px;height:520px;margin-bottom:12px;display:flex;overflow:hidden}.chat-backdrop{z-index:199;background:#0006;position:fixed;inset:0}.chat-window.expanded{z-index:200;width:min(800px,90vw);height:min(700px,90vh);position:fixed;inset:50% auto auto 50%;transform:translate(-50%,-50%);box-shadow:0 14px 28px #00000040,0 10px 10px #00000026}@media (width<=520px){.chat-window{z-index:200;border-radius:0;width:100%;height:100%;margin-bottom:0;position:fixed;inset:0}.chat-window.expanded{width:100%;height:100%;top:0;left:0;transform:none}.ai-chat-container{bottom:0;right:0}.chat-bubble-btn{width:48px;height:48px;margin:16px}}.chat-header{background:var(--color-canvas-parchment);border-bottom:1px solid var(--color-hairline);font-size:var(--text-body);font-weight:var(--weight-semibold);color:var(--color-ink);justify-content:space-between;align-items:center;padding:14px 16px;display:flex}.header-center{padding:0 var(--space-xs);flex:1;justify-content:center;display:flex}.header-actions{gap:4px;display:flex}.voice-select{font-family:inherit;font-size:var(--text-fine);color:var(--color-ink-muted-48);border-radius:var(--radius-pill);cursor:pointer;max-width:130px;transition:border-color var(--transition-fast);background:0 0;border:1px solid #0000;padding:2px 6px}.voice-select:hover{border-color:var(--color-hairline)}.voice-select:focus{border-color:var(--color-primary);outline:none}.close-btn,.expand-btn{color:var(--color-ink-muted-48);border-radius:var(--radius-pill);width:28px;height:28px;transition:background var(--transition-fast);justify-content:center;align-items:center;display:flex}.close-btn:hover,.expand-btn:hover{background:var(--color-canvas-parchment)}.chat-login-prompt{justify-content:center;align-items:center;gap:var(--space-sm);padding:var(--space-lg);color:var(--color-ink-muted-48);font-size:var(--text-caption);text-align:center;flex-direction:column;flex:1;display:flex}.chat-login-btn{background:var(--color-primary);color:#fff;border-radius:var(--radius-pill);font-size:var(--text-caption);cursor:pointer;transition:background var(--transition-fast);border:none;align-items:center;gap:6px;padding:8px 20px;font-family:inherit;display:inline-flex}.chat-login-btn:hover{background:var(--color-primary-focus)}.chat-messages{background:var(--color-canvas);flex-direction:column;flex:1;gap:12px;padding:16px;display:flex;overflow-y:auto}.message{max-width:85%}.message.user{align-self:flex-end}.message-content{border-radius:var(--radius-lg);font-size:var(--text-caption);line-height:var(--leading-caption);letter-spacing:var(--tracking-caption);padding:10px 14px}.message.user .message-content{background:var(--color-primary);color:#fff;border-bottom-right-radius:4px}.message.ai .message-content{color:var(--color-ink);border:1px solid var(--color-hairline);background:#fff;border-bottom-left-radius:4px;box-shadow:0 4px 12px #00000008}.chat-input-area{background:var(--color-canvas);border-top:1px solid var(--color-hairline);gap:8px;padding:12px 16px;display:flex}.chat-input{border-radius:var(--radius-pill);font-family:inherit;font-size:var(--text-caption);color:var(--color-ink);transition:border-color var(--transition-fast);border:1px solid #00000014;outline:none;flex:1;padding:8px 16px}.chat-input:focus{border-color:var(--color-primary)}.chat-speak-btn{border-radius:var(--radius-full);background:var(--color-canvas-parchment);width:36px;height:36px;color:var(--color-ink);transition:background var(--transition-fast);border:1px solid var(--color-hairline);flex-shrink:0;justify-content:center;align-items:center;display:flex}.chat-speak-btn:hover:not(:disabled){background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.chat-speak-btn:disabled{opacity:.3;cursor:not-allowed}.send-btn{border-radius:var(--radius-full);background:var(--color-primary);color:#fff;width:36px;height:36px;transition:background var(--transition-fast);flex-shrink:0;justify-content:center;align-items:center;display:flex}.send-btn:hover:not(:disabled){background:var(--color-primary-focus)}.send-btn:disabled{opacity:.4;cursor:not-allowed}.send-btn.limited{background:var(--color-ink-muted-48)}.typing-indicator{align-self:flex-start;align-items:center;padding:4px;display:flex}.message-content h1,.message-content h2,.message-content h3{font-weight:var(--weight-semibold);margin-top:8px;margin-bottom:4px}.message-content h3{font-size:1rem}.message-content h2{font-size:1.1rem}.message-content blockquote{border-left:2px solid var(--color-primary);background:var(--color-notes-orange-tint);border-radius:2px;margin:8px 0;padding:4px 10px;font-style:italic}.message-content li{margin-bottom:4px;margin-left:16px}.message-content hr{border:0;border-top:1px solid var(--color-hairline);margin:10px 0}.message-content strong{font-weight:var(--weight-semibold)}.message.user .message-content a{color:#ffffffe6;text-decoration:underline}.chat-struct-container{flex-direction:column;gap:8px;display:flex}.chat-struct{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-sm);overflow:hidden}.chat-struct .card-header{border-bottom:1px solid var(--color-hairline);background:var(--color-canvas-parchment);align-items:center;gap:6px;padding:8px 10px;display:flex}.chat-struct .card-header h4{font-size:.85rem;font-weight:var(--weight-semibold);margin:0}.chat-struct .card-body{font-size:var(--text-fine);line-height:var(--leading-caption);padding:10px}.explanation-card .card-body p{margin-bottom:6px}.explanation-card .card-body ul,.explanation-card .card-body ol{margin-bottom:6px;padding-left:16px}.explanation-card .card-body li{margin-bottom:3px}.explanation-card .card-body blockquote{border-left:2px solid var(--color-primary);background:var(--color-notes-orange-tint);font-style:italic;font-size:var(--text-fine);border-radius:2px;margin:6px 0;padding:3px 8px}.comparison-card{border-left:3px solid var(--color-primary)}.comparison-grid{grid-template-columns:1fr;gap:6px;padding:8px;display:grid}.comparison-column{border-radius:var(--radius-sm);border:1px solid var(--color-hairline);background:#fff;padding:8px}.comparison-column h5{font-size:.8rem;font-weight:var(--weight-semibold);margin-bottom:4px}.comparison-column li{font-size:var(--text-fine);margin-bottom:3px}.examples-block{margin-top:0}.examples-title{font-size:.85rem;font-weight:var(--weight-semibold);background:var(--color-canvas-parchment);border-bottom:1px solid var(--color-hairline);align-items:center;gap:6px;margin:0;padding:8px 10px;display:flex}.examples-grid{flex-direction:column;gap:6px;padding:8px;display:flex}.example-item{border:1px solid var(--color-hairline);border-radius:var(--radius-sm);background:#fff;padding:8px}.example-sentence{font-size:.85rem;font-weight:var(--weight-semibold);font-style:italic;line-height:var(--leading-body);border-left:2px solid var(--color-hairline);margin-bottom:4px;padding-left:6px}.quiz-card{border-left:3px solid var(--color-primary)}.quiz-question{font-size:.85rem;font-weight:var(--weight-semibold);line-height:var(--leading-body);margin-bottom:10px}.quiz-options-list{flex-direction:column;gap:4px;margin-bottom:10px;display:flex}.quiz-opt-btn{text-align:left;border-radius:var(--radius-pill);border:1px solid var(--color-hairline);background:var(--color-canvas);width:100%;color:var(--color-ink);font-size:var(--text-fine);font-weight:var(--weight-regular);transition:all var(--transition-fast);cursor:pointer;font-family:var(--font-body);padding:6px 10px}.quiz-btn{font-size:var(--text-fine);padding:6px 14px}.quiz-feedback{border-radius:var(--radius-sm);border:1px solid #0000;margin-top:8px;padding:8px}.quiz-feedback.correct{background:var(--color-success-bg);border-color:var(--color-success)}.quiz-feedback.incorrect{background:var(--color-error-bg);border-color:var(--color-error)}.correct-answer-reveal{font-weight:var(--weight-semibold);font-size:var(--text-fine);color:var(--color-success);margin-top:4px}.typing-blinker{animation:1s step-end infinite blinker}@keyframes blinker{50%{opacity:0}}.streaming{opacity:.85}.loading-animation{justify-content:center;align-items:center;display:flex}.btn{font-family:var(--font-body);font-weight:var(--weight-regular);line-height:var(--leading-button);border-radius:var(--radius-pill);transition:all var(--transition-fast);cursor:pointer;white-space:nowrap;border:none;justify-content:center;align-items:center;gap:6px;text-decoration:none;display:inline-flex}.btn:active{transform:scale(.95)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn-sm{font-size:var(--text-caption);letter-spacing:var(--tracking-caption);padding:8px 16px}.btn-md{font-size:var(--text-body);letter-spacing:var(--tracking-body);padding:11px 22px}.btn-lg{font-size:var(--text-button-large);font-weight:var(--weight-light);letter-spacing:0;padding:14px 28px}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--color-primary-focus)}.btn-secondary{color:var(--color-primary);border:1px solid var(--color-primary);background:0 0}.btn-secondary:hover:not(:disabled){background:var(--color-notes-orange-tint)}.btn-ghost{color:var(--color-ink-muted-48);background:0 0;border:1px solid #0000}.btn-ghost:hover:not(:disabled){color:var(--color-primary);background:var(--color-canvas-parchment)}.btn-pearl{background:var(--color-surface-pearl);color:var(--color-ink-muted-80);border:3px solid var(--color-divider-soft);border-radius:var(--radius-md)}.btn-pearl:hover:not(:disabled){background:var(--color-canvas-parchment)}.btn-dark{background:var(--color-ink);color:var(--color-body-on-dark);border-radius:var(--radius-sm);font-size:var(--text-button-utility);letter-spacing:var(--tracking-button-utility);padding:8px 15px}.btn-dark:hover:not(:disabled){opacity:.9}.btn-icon{align-items:center;display:flex}.card{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);transition:all var(--transition-fast)}.card-pad-sm{padding:var(--space-sm)}.card-pad-md{padding:var(--space-lg)}.card-pad-lg{padding:var(--space-xl)}.card-hover:hover{border-color:var(--color-primary);box-shadow:var(--shadow-hairline)}.card-clickable{cursor:pointer}.card-header{margin-bottom:var(--space-sm)}.card-body{flex:1}.card-footer{margin-top:var(--space-sm);justify-content:space-between;align-items:center;display:flex}.input-wrapper{align-items:center;gap:var(--space-xs);background:var(--color-canvas);border-radius:var(--radius-pill);height:44px;transition:border-color var(--transition-fast);border:1px solid #00000014;padding:12px 20px;display:flex}.input-wrapper:focus-within{border-color:var(--color-primary)}.input-icon{color:var(--color-ink-muted-48);flex-shrink:0;align-items:center;display:flex}.input-field{font-size:var(--text-body);font-weight:var(--weight-regular);font-family:var(--font-body);color:var(--color-ink);letter-spacing:var(--tracking-body);background:0 0;border:none;outline:none;flex:1}.input-field::placeholder{color:var(--color-ink-muted-48)}.badge{width:fit-content;font-weight:var(--weight-semibold);white-space:nowrap;border-radius:var(--radius-pill);font-family:var(--font-body);align-items:center;display:inline-flex}.badge-sm{font-size:var(--text-fine);letter-spacing:var(--tracking-fine);padding:4px 10px}.badge-md{font-size:var(--text-caption);letter-spacing:var(--tracking-caption);padding:6px 14px}.badge-default{background:var(--color-canvas-parchment);color:var(--color-ink-muted-80)}.badge-primary{background:var(--color-primary);color:#fff}.badge-success{background:var(--color-success-bg);color:var(--color-success)}.badge-error{background:var(--color-error-bg);color:var(--color-error)}.badge-clickable{cursor:pointer;transition:opacity var(--transition-fast)}.badge-clickable:hover{opacity:.8}.progress-container{width:100%}.progress-label{font-size:var(--text-caption);letter-spacing:var(--tracking-caption);color:var(--color-ink-muted-48);margin-bottom:var(--space-xxs);justify-content:space-between;display:flex}.progress-track{background:var(--color-canvas-parchment);border-radius:var(--radius-pill);overflow:hidden}.progress-sm{height:4px}.progress-md{height:6px}.progress-lg{height:10px}.progress-fill{border-radius:var(--radius-pill);height:100%;transition:width .5s}.progress-fill-primary{background:var(--color-primary)}.progress-fill-accent{background:var(--color-primary-on-dark)}.progress-fill-success{background:var(--color-success)}.home-root{flex-direction:column;display:flex}.product-tile{width:100%;padding:var(--space-section) 0;justify-content:center;display:flex}.tile-light{background:var(--color-canvas)}.tile-parchment{background:var(--color-canvas-parchment)}.tile-dark{background:var(--color-surface-tile-1)}.tile-content{text-align:center;width:100%;max-width:980px;padding:0 24px}.tile-narrow{max-width:840px}.tile-hero{font-family:var(--font-display);font-size:var(--text-hero);font-weight:var(--weight-semibold);line-height:var(--leading-hero);letter-spacing:var(--tracking-hero);color:var(--color-ink);margin-bottom:var(--space-sm)}.tile-heading{font-family:var(--font-display);font-size:var(--text-display-lg);font-weight:var(--weight-semibold);line-height:var(--leading-display-lg);color:var(--color-ink);margin-bottom:var(--space-xl)}.tile-heading-light{color:var(--color-body-on-dark)}.tile-lead{font-family:var(--font-display);font-size:var(--text-lead);font-weight:var(--weight-regular);line-height:var(--leading-lead);letter-spacing:var(--tracking-lead);color:var(--color-ink);margin-bottom:var(--space-xl);max-width:600px;margin-left:auto;margin-right:auto}.tile-actions{justify-content:center;gap:var(--space-sm);display:flex}.tile-header-row{margin-bottom:var(--space-xl);justify-content:space-between;align-items:center;display:flex}.tile-link{font-size:var(--text-body);font-weight:var(--weight-regular);letter-spacing:var(--tracking-body);color:var(--color-primary);transition:gap var(--transition-fast);align-items:center;gap:4px;text-decoration:none;display:flex}.tile-link:hover{color:var(--color-primary);gap:8px}.stats-grid{gap:var(--space-md);grid-template-columns:repeat(3,1fr);display:grid}@media (width<=640px){.stats-grid{grid-template-columns:1fr}}.stat-card{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);padding:var(--space-lg);align-items:center;gap:var(--space-sm);text-align:center;flex-direction:column;display:flex}.stat-icon{color:var(--color-primary);opacity:.7}.stat-info{flex-direction:column;gap:2px;display:flex}.stat-value{font-family:var(--font-display);font-size:var(--text-display-md);font-weight:var(--weight-semibold);line-height:var(--leading-display-md);letter-spacing:var(--tracking-display-md);color:var(--color-ink)}.stat-label{font-size:var(--text-caption);letter-spacing:var(--tracking-caption);color:var(--color-ink-muted-48)}.units-mini-grid{gap:var(--space-md);text-align:left;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));display:grid}.unit-mini-card{background:var(--color-surface-tile-2);border-radius:var(--radius-lg);padding:var(--space-lg);gap:var(--space-xs);transition:border-color var(--transition-fast), background var(--transition-fast);border:1px solid #0000;flex-direction:column;text-decoration:none;display:flex}.unit-mini-card:hover{border-color:var(--color-primary);background:#f09a380d}.unit-mini-badge{width:fit-content;color:var(--color-body-muted);border-radius:var(--radius-pill);font-size:var(--text-fine);letter-spacing:var(--tracking-fine);font-weight:var(--weight-semibold);background:#ffffff1a;padding:3px 10px;display:inline-block}.unit-mini-title{font-family:var(--font-display);font-size:var(--text-tagline);font-weight:var(--weight-semibold);line-height:var(--leading-tagline);letter-spacing:var(--tracking-tagline);color:var(--color-body-on-dark)}.unit-mini-desc{font-size:var(--text-caption);letter-spacing:var(--tracking-caption);color:var(--color-body-muted);line-height:var(--leading-caption);flex:1}.unit-mini-exercises{font-size:var(--text-fine);letter-spacing:var(--tracking-fine);color:var(--color-ink-muted-48)}.unit-mini-footer{justify-content:space-between;align-items:center;margin-top:.5rem;display:flex}.unit-mini-progress{border-radius:var(--radius-pill);font-variant-numeric:tabular-nums;padding:2px 8px;font-size:.75rem;font-weight:700}.unit-mini-progress-strong{color:#34c759;background:#34c75926}.unit-mini-progress-moderate{color:#f09a38;background:#f09a3826}.unit-mini-progress-weak{color:#ff453a;background:#ff453a26}.unit-mini-progress-ip{color:#007aff;background:#007aff26}@media (width<=768px){.tile-hero{font-size:var(--text-display-lg);line-height:var(--leading-display-lg)}.tile-lead{font-size:var(--text-lead-airy);line-height:var(--leading-lead-airy);letter-spacing:var(--tracking-lead-airy)}.tile-content{padding:0 16px}.product-tile{padding:var(--space-xxl) 0}}@media (width<=480px){.tile-hero{font-size:1.75rem}.tile-heading{font-size:1.5rem}.units-mini-grid{grid-template-columns:1fr}}.units-root{flex-direction:column;display:flex}.units-grid{gap:var(--space-md);text-align:left;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));display:grid}.unit-card-link{text-decoration:none;display:block}.unit-card{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);padding:var(--space-lg);gap:var(--space-xs);transition:border-color var(--transition-fast);flex-direction:column;height:100%;display:flex}.unit-card:hover{border-color:var(--color-primary)}.unit-card-badge{background:var(--color-canvas-parchment);width:fit-content;color:var(--color-ink-muted-80);border-radius:var(--radius-pill);font-size:var(--text-fine);letter-spacing:var(--tracking-fine);font-weight:var(--weight-semibold);padding:3px 10px;display:inline-block}.unit-card-title{font-family:var(--font-display);font-size:var(--text-tagline);font-weight:var(--weight-semibold);line-height:var(--leading-tagline);letter-spacing:var(--tracking-tagline);color:var(--color-ink);margin-top:var(--space-xs)}.unit-card-desc{font-size:var(--text-caption);line-height:var(--leading-caption);letter-spacing:var(--tracking-caption);color:var(--color-ink-muted-48);flex:1}.unit-card-footer{margin-top:var(--space-sm);padding-top:var(--space-sm);border-top:1px solid var(--color-hairline);justify-content:space-between;align-items:center;display:flex}.unit-card-exercises{font-size:var(--text-fine);letter-spacing:var(--tracking-fine);color:var(--color-ink-muted-48)}.unit-card-progress{border-radius:var(--radius-pill);font-variant-numeric:tabular-nums;padding:2px 8px;font-size:.75rem;font-weight:700}.unit-card-progress-strong{color:#34c759;background:#34c75926}.unit-card-progress-moderate{color:#f09a38;background:#f09a3826}.unit-card-progress-weak{color:#ff453a;background:#ff453a26}.unit-card-progress-ip{color:#007aff;background:#007aff26}.unit-card-cta{font-size:var(--text-caption);letter-spacing:var(--tracking-caption);color:var(--color-primary);font-weight:var(--weight-semibold);transition:gap var(--transition-fast);align-items:center;gap:4px;display:flex}.unit-card:hover .unit-card-cta{gap:8px}@media (width<=480px){.units-grid{grid-template-columns:1fr}}.exercises-container{gap:var(--space-xl);text-align:left;flex-direction:column;display:flex}.exercise-card{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);padding:var(--space-xl)}@media (width<=480px){.exercise-card{padding:var(--space-lg)}}.exercise-header{margin-bottom:var(--space-lg);justify-content:space-between;align-items:center;display:flex}.exercise-number{font-weight:var(--weight-semibold);color:var(--color-primary);font-size:var(--text-body)}.exercise-question{font-size:var(--text-body);margin-bottom:var(--space-lg);color:var(--color-ink);line-height:var(--leading-body);letter-spacing:var(--tracking-body)}.options-grid{gap:var(--space-sm);flex-direction:column;display:flex}.option-btn{padding:var(--space-sm) var(--space-lg);border:1px solid var(--color-hairline);border-radius:var(--radius-pill);background:var(--color-canvas);color:var(--color-ink);text-align:left;font-size:var(--text-caption);transition:all var(--transition-fast);font-family:var(--font-body)}.option-btn:hover:not(:disabled){border-color:var(--color-primary);background:var(--color-canvas-parchment)}.option-btn.selected{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.option-btn.correct{border-color:var(--color-success);background:var(--color-success-bg);color:var(--color-success)}.option-btn.incorrect{border-color:var(--color-error);background:var(--color-error-bg);color:var(--color-error)}.blank-input{border:none;border-bottom:2px solid var(--color-hairline);color:var(--color-primary);font-size:var(--text-body);font-family:inherit;font-weight:var(--weight-semibold);text-align:center;width:150px;transition:border-color var(--transition-fast);background:0 0;outline:none;padding:4px 8px}.blank-input:focus{border-color:var(--color-primary)}.blank-input.correct{border-color:var(--color-success);color:var(--color-success)}.blank-input.incorrect{border-color:var(--color-error);color:var(--color-error)}.feedback-section{margin-top:var(--space-lg);padding:var(--space-md);border-radius:var(--radius-sm)}.feedback-section.correct{background:var(--color-success-bg);border:1px solid var(--color-success);color:var(--color-success)}.feedback-section.incorrect{background:var(--color-error-bg);border:1px solid var(--color-error);color:var(--color-error)}.feedback-header{align-items:center;gap:var(--space-xs);font-weight:var(--weight-semibold);margin-bottom:var(--space-xs);display:flex}.check-btn-container{margin-top:var(--space-lg);justify-content:flex-end;display:flex}.unit-reader-container{background:var(--color-canvas-parchment);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);flex-direction:column;height:600px;display:flex;overflow:hidden}@media (width<=768px){.unit-reader-container{height:500px;max-height:60vh}}.unit-reader-header{align-items:center;gap:var(--space-xs);padding:var(--space-md) var(--space-lg);background:var(--color-canvas-parchment);border-bottom:1px solid var(--color-hairline);color:var(--color-ink);font-weight:var(--weight-semibold);font-size:var(--text-body);display:flex}.unit-reader-workspace{padding:var(--space-lg);gap:var(--space-lg);flex-direction:column;flex:1;display:flex;overflow-y:auto}.reader-card{border:1px solid var(--color-hairline);border-radius:var(--radius-lg);background:#fff;flex-shrink:0;overflow:hidden;box-shadow:0 4px 12px #00000008}.reader-card .card-header{align-items:center;gap:var(--space-xs);padding:var(--space-md) var(--space-lg);border-bottom:1px solid var(--color-hairline);background:var(--color-canvas-parchment);display:flex}.reader-card .card-header h4{font-size:var(--text-body);font-weight:var(--weight-semibold);color:var(--color-ink);margin:0}.reader-card .card-body{padding:var(--space-lg)}.explanation-card,.comparison-card,.quiz-card{border-left:3px solid var(--color-primary)}.explanation-card .card-body p{margin-bottom:var(--space-sm);color:var(--color-ink);font-size:var(--text-caption);line-height:var(--leading-body)}.explanation-card .card-body p:last-child{margin-bottom:0}.explanation-card .card-body strong{font-weight:var(--weight-semibold)}.explanation-card .card-body ul,.explanation-card .card-body ol{padding-left:var(--space-lg);margin-bottom:var(--space-sm)}.explanation-card .card-body li{color:var(--color-ink);font-size:var(--text-caption);margin-bottom:4px}.explanation-card .card-body blockquote{margin:var(--space-sm) 0;padding:var(--space-xs) var(--space-md);border-left:2px solid var(--color-primary);background:var(--color-notes-orange-tint);font-style:italic;font-size:var(--text-caption);border-radius:2px}.comparison-grid{gap:var(--space-md);grid-template-columns:1fr 1fr;display:grid}@media (width<=640px){.comparison-grid{grid-template-columns:1fr}}.comparison-column{padding:var(--space-md);border-radius:var(--radius-sm);background:var(--color-canvas);border:1px solid var(--color-hairline)}.comparison-column h5{font-size:var(--text-caption);font-weight:var(--weight-semibold);margin-bottom:var(--space-sm);color:var(--color-ink)}.comparison-column.left-col,.comparison-column.right-col{border-left:3px solid var(--color-primary)}.comparison-column ul{padding-left:var(--space-lg)}.comparison-column li{font-size:var(--text-caption);color:var(--color-ink);margin-bottom:4px}.examples-container-block{margin-top:var(--space-xs);flex-shrink:0}.examples-grid{gap:var(--space-md);flex-direction:column;display:flex}.example-item-card{border:1px solid var(--color-hairline);border-radius:var(--radius-lg);padding:var(--space-md);background:#fff;box-shadow:0 4px 12px #00000008}.example-badge{font-size:var(--text-micro);font-weight:var(--weight-bold);text-transform:uppercase;letter-spacing:.05em;background:var(--color-notes-orange-tint);color:#8a4e08;border-radius:var(--radius-pill);margin-bottom:var(--space-sm);padding:4px 8px;display:inline-block}.example-sentence{font-size:var(--text-body);font-weight:var(--weight-semibold);color:var(--color-ink);margin-bottom:var(--space-xs);font-style:italic;line-height:var(--leading-body);border-left:2px solid var(--color-hairline);padding-left:var(--space-sm)}.example-desc{font-size:var(--text-caption);color:#555558;line-height:var(--leading-caption)}.quiz-question{font-size:var(--text-body);font-weight:var(--weight-semibold);color:var(--color-ink);margin-bottom:var(--space-lg);line-height:var(--leading-body)}.quiz-options-list{gap:var(--space-sm);margin-bottom:var(--space-lg);flex-direction:column;display:flex}.quiz-opt-btn{text-align:left;width:100%;padding:var(--space-sm) var(--space-lg);border-radius:var(--radius-pill);border:1px solid var(--color-hairline);background:var(--color-canvas);color:var(--color-ink);font-size:var(--text-caption);font-weight:var(--weight-regular);transition:all var(--transition-fast);cursor:pointer;font-family:var(--font-body)}.quiz-opt-btn:hover:not(:disabled){border-color:var(--color-primary);background:var(--color-canvas-parchment)}.quiz-opt-btn.selected{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.quiz-opt-btn.correct{border-color:var(--color-success);background:var(--color-success-bg);color:var(--color-success)}.quiz-opt-btn.incorrect{border-color:var(--color-error);background:var(--color-error-bg);color:var(--color-error)}.quiz-opt-btn:disabled{cursor:not-allowed}.quiz-action-area{justify-content:flex-end;display:flex}.quiz-feedback{padding:var(--space-md);border-radius:var(--radius-sm);margin-top:var(--space-lg);border:1px solid #0000}.quiz-feedback.correct{background:var(--color-success-bg);border-color:var(--color-success);color:var(--color-ink)}.quiz-feedback.incorrect{background:var(--color-error-bg);border-color:var(--color-error);color:var(--color-ink)}.feedback-header{font-size:var(--text-body);font-weight:var(--weight-semibold);margin-bottom:var(--space-xs)}.quiz-feedback.correct .feedback-header{color:var(--color-success)}.quiz-feedback.incorrect .feedback-header{color:var(--color-error)}.feedback-desc{font-size:var(--text-caption);line-height:var(--leading-caption)}.correct-answer-reveal{margin-top:var(--space-xs);font-weight:var(--weight-semibold);font-size:var(--text-caption);color:var(--color-success)}.reader-loading-skeleton{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);padding:var(--space-lg);gap:var(--space-lg);flex-direction:column;flex-shrink:0;display:flex}.skeleton-loader-line.progress{background:linear-gradient(90deg, var(--color-hairline) 25%, var(--color-primary) 50%, var(--color-hairline) 75%);border-radius:var(--radius-pill);background-size:200% 100%;height:4px;animation:1.5s infinite loading-animation}.loading-status{align-items:center;gap:var(--space-xs);color:var(--color-ink-muted-48);font-size:var(--text-caption);display:flex}.spinner{border:2px solid var(--color-hairline);border-top-color:var(--color-primary);border-radius:var(--radius-full);width:18px;height:18px;animation:1s linear infinite spin}.streaming-indicator{align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-lg);background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);color:var(--color-ink-muted-48);font-size:var(--text-caption);margin-top:var(--space-xs);align-self:flex-start;display:flex}.unit-reader-input-area{gap:var(--space-xs);padding:var(--space-md);background:var(--color-canvas);border-top:1px solid var(--color-hairline);display:flex}.unit-reader-input{border-radius:var(--radius-pill);background:var(--color-canvas);color:var(--color-ink);font-size:var(--text-caption);font-family:var(--font-body);transition:border-color var(--transition-fast);border:1px solid #00000014;flex:1;padding:8px 16px}.unit-reader-input:focus{border-color:var(--color-primary);outline:none}.unit-reader-send-btn{border-radius:var(--radius-full);background:var(--color-primary);color:#fff;width:36px;height:36px;transition:background var(--transition-fast);cursor:pointer;border:none;flex-shrink:0;justify-content:center;align-items:center;display:flex}.unit-reader-send-btn:hover:not(:disabled){background:var(--color-primary-focus)}.unit-reader-send-btn:disabled{opacity:.4;cursor:not-allowed}@keyframes spin{to{transform:rotate(360deg)}}@keyframes loading-animation{0%{background-position:200% 0}to{background-position:-200% 0}}.playground-container{text-align:left;flex-direction:column;min-height:500px;display:flex}.playground-header{margin-bottom:var(--space-lg);justify-content:space-between;align-items:center;display:flex}.playground-header h1{font-family:var(--font-display);font-size:var(--text-display-md);font-weight:var(--weight-semibold);align-items:center;gap:var(--space-sm);color:var(--color-ink);display:flex}.playground-header p{color:var(--color-ink-muted-48);font-size:var(--text-caption)}.playground-workspace{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);flex:1;min-height:400px;overflow:hidden}.chat-area{flex-direction:column;height:100%;display:flex}.messages-list{padding:var(--space-lg);gap:var(--space-lg);flex-direction:column;flex:1;display:flex;overflow-y:auto}.chat-bubble-container{gap:var(--space-sm);max-width:85%;display:flex}.chat-bubble-container.user{flex-direction:row-reverse;align-self:flex-end}.chat-bubble-container.ai{align-self:flex-start}.chat-bubble-content{gap:var(--space-sm);flex-direction:column;flex:1;display:flex}.chat-bubble{padding:var(--space-sm) var(--space-md);border-radius:var(--radius-lg);font-size:var(--text-caption);line-height:var(--leading-caption)}.chat-bubble-container.user .chat-bubble{background:var(--color-primary);color:#fff}.chat-bubble-container.ai .chat-bubble{background:var(--color-canvas-parchment);color:var(--color-ink);border:1px solid var(--color-hairline)}.chat-bubble p{margin-bottom:var(--space-sm)}.chat-bubble p:last-child{margin-bottom:0}.chat-bubble ul,.chat-bubble ol{margin-left:var(--space-lg);margin-bottom:var(--space-sm)}.chat-bubble blockquote{border-left:2px solid var(--color-primary);padding-left:var(--space-sm);margin:var(--space-sm) 0;color:var(--color-ink-muted-48)}.chat-controls{padding:var(--space-lg);border-top:1px solid var(--color-hairline);background:var(--color-canvas)}.sample-selector-header{align-items:center;gap:var(--space-xs);font-size:var(--text-caption);font-weight:var(--weight-semibold);color:var(--color-ink);margin-bottom:var(--space-md);display:flex}.suggestions-grid{gap:var(--space-sm);grid-template-columns:repeat(2,1fr);display:grid}.suggestion-btn{align-items:flex-start;gap:var(--space-sm);padding:var(--space-md);border:1px solid var(--color-hairline);border-radius:var(--radius-lg);background:var(--color-canvas-parchment);text-align:left;transition:all var(--transition-fast);font-family:var(--font-body);display:flex}.suggestion-btn:hover:not(:disabled){border-color:var(--color-primary);background:var(--color-notes-orange-tint)}.suggestion-btn:disabled{opacity:.6;cursor:not-allowed}.suggestion-btn .sug-icon{margin-top:2px;font-size:1.5rem;line-height:1}.sug-info{flex-direction:column;gap:2px;display:flex}.suggestion-btn .sug-text{font-size:var(--text-caption);font-weight:var(--weight-semibold);color:var(--color-ink)}.sug-desc{font-size:var(--text-fine);color:var(--color-ink-muted-48);line-height:var(--leading-caption)}.widget-card{border-radius:var(--radius-lg);border:1px solid var(--color-hairline);margin-top:var(--space-xs);flex-direction:column;display:flex;overflow:hidden}.widget-card-header{padding:var(--space-sm) var(--space-lg);background:var(--color-canvas-parchment);border-bottom:1px solid var(--color-hairline);justify-content:space-between;align-items:center;display:flex}.widget-title{align-items:center;gap:var(--space-xs);font-weight:var(--weight-semibold);font-size:var(--text-caption);color:var(--color-ink);display:flex}.widget-tabs{background:var(--color-canvas);border-radius:var(--radius-sm);border:1px solid var(--color-hairline);gap:4px;padding:4px;display:flex}.widget-tabs .tab-btn{font-size:var(--text-fine);font-weight:var(--weight-regular);border-radius:calc(var(--radius-sm) - 2px);color:var(--color-ink-muted-48);transition:all var(--transition-fast);font-family:var(--font-body);align-items:center;gap:4px;padding:4px 12px;display:flex}.widget-tabs .tab-btn:hover{color:var(--color-ink);background:var(--color-canvas-parchment)}.widget-tabs .tab-btn.active{color:var(--color-primary);background:var(--color-notes-orange-tint)}.widget-card-body{padding:var(--space-lg);background:var(--color-canvas);min-height:200px}.code-display{background:var(--color-surface-tile-1);color:var(--color-body-on-dark);padding:var(--space-md);border-radius:var(--radius-sm);font-family:Courier New,Courier,monospace;font-size:var(--text-caption);max-height:400px;margin:0;overflow-x:auto}.active-widget-view{background:var(--color-canvas);flex-direction:column;width:100%;height:100%;display:flex}.active-widget-header{padding:var(--space-md) var(--space-lg);border-bottom:1px solid var(--color-hairline);background:var(--color-canvas-parchment);justify-content:space-between;align-items:center;gap:var(--space-md);flex-wrap:wrap;display:flex}.back-chat-btn{align-items:center;gap:var(--space-xs);color:var(--color-primary);cursor:pointer;font-weight:var(--weight-semibold);font-size:var(--text-caption);border-radius:var(--radius-sm);transition:all var(--transition-fast);font-family:var(--font-body);background:0 0;border:none;padding:6px 12px;display:inline-flex}.back-chat-btn:hover{background:var(--color-notes-orange-tint);color:var(--color-primary)}@media (width<=768px){.suggestions-grid{grid-template-columns:1fr}.chat-bubble-container{max-width:95%}}@media (width<=480px){.chat-bubble-container{max-width:100%}.suggestions-grid{grid-template-columns:1fr}}.chat-bubble .chat-struct-container{flex-direction:column;gap:8px;display:flex}.chat-bubble .chat-struct{background:var(--color-canvas);border:1px solid var(--color-hairline);border-radius:var(--radius-sm);overflow:hidden}.chat-bubble .chat-struct .card-header{border-bottom:1px solid var(--color-hairline);background:var(--color-canvas-parchment);align-items:center;gap:6px;padding:8px 10px;display:flex}.chat-bubble .chat-struct .card-header h4{font-size:.85rem;font-weight:var(--weight-semibold);margin:0}.chat-bubble .chat-struct .card-body{font-size:var(--text-fine);line-height:var(--leading-caption);padding:10px}.chat-bubble .explanation-card{border-left:3px solid var(--color-primary)}.chat-bubble .explanation-card .card-body p{margin-bottom:6px}.chat-bubble .explanation-card .card-body strong{font-weight:var(--weight-semibold)}.chat-bubble .explanation-card .card-body ul,.chat-bubble .explanation-card .card-body ol{margin-bottom:6px;padding-left:16px}.chat-bubble .explanation-card .card-body li{margin-bottom:3px}.chat-bubble .explanation-card .card-body blockquote{border-left:2px solid var(--color-primary);background:var(--color-notes-orange-tint);font-style:italic;font-size:var(--text-fine);border-radius:2px;margin:6px 0;padding:3px 8px}.chat-bubble .comparison-card{border-left:3px solid var(--color-primary)}.chat-bubble .comparison-grid{grid-template-columns:1fr;gap:6px;padding:8px;display:grid}.chat-bubble .comparison-column{border-radius:var(--radius-sm);background:var(--color-canvas-parchment);border:1px solid var(--color-hairline);padding:8px}.chat-bubble .comparison-column h5{font-size:.8rem;font-weight:var(--weight-semibold);margin-bottom:4px}.chat-bubble .comparison-column ul{padding-left:14px}.chat-bubble .comparison-column li{font-size:var(--text-fine);margin-bottom:3px}.chat-bubble .examples-title{font-size:.85rem;font-weight:var(--weight-semibold);background:var(--color-canvas-parchment);border-bottom:1px solid var(--color-hairline);align-items:center;gap:6px;margin:0;padding:8px 10px;display:flex}.chat-bubble .examples-grid{flex-direction:column;gap:6px;padding:8px;display:flex}.chat-bubble .example-item{background:var(--color-canvas-parchment);border:1px solid var(--color-hairline);border-radius:var(--radius-sm);padding:8px}.chat-bubble .example-badge{font-size:.65rem;font-weight:var(--weight-bold);text-transform:uppercase;letter-spacing:.05em;background:var(--color-notes-orange-tint);color:var(--color-primary);border-radius:var(--radius-pill);margin-bottom:4px;padding:2px 6px;display:inline-block}.chat-bubble .example-sentence{font-size:.85rem;font-weight:var(--weight-semibold);font-style:italic;line-height:var(--leading-body);border-left:2px solid var(--color-hairline);margin-bottom:4px;padding-left:6px}.chat-bubble .example-desc{font-size:var(--text-fine);color:var(--color-ink-muted-48);line-height:var(--leading-caption)}.chat-bubble .quiz-card{border-left:3px solid var(--color-primary)}.chat-bubble .quiz-question{font-size:.85rem;font-weight:var(--weight-semibold);line-height:var(--leading-body);margin-bottom:10px}.chat-bubble .quiz-options-list{flex-direction:column;gap:4px;margin-bottom:10px;display:flex}.chat-bubble .quiz-opt-btn{text-align:left;border-radius:var(--radius-pill);border:1px solid 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var(--transition-fast);border:none;align-items:center;gap:10px;padding:11px 28px;display:inline-flex}.google-btn:hover{background:var(--color-primary-focus)}.google-btn:active{transform:scale(.95)}:root{--color-primary:#f09a38;--color-primary-focus:#d87e1f;--color-primary-on-dark:#f09a38;--color-ink:#1c1c1e;--color-body:#1c1c1e;--color-body-on-dark:#f2f2f2;--color-body-muted:#8e8e93;--color-ink-muted-80:#1c1c1e;--color-ink-muted-48:#8e8e93;--color-divider-soft:#edead8;--color-hairline:#edead8;--color-canvas:#fffbed;--color-canvas-parchment:#faf6e3;--color-surface:#fff;--color-bg:#fff1dd;--color-surface-pearl:#fffbed;--color-surface-tile-1:#1a1a1a;--color-surface-tile-2:#262626;--color-surface-tile-3:#333;--color-surface-black:#1a1a1a;--color-surface-chip:#f2edd6;--color-success:#34c759;--color-success-bg:#d1fae5;--color-error:#ff3b30;--color-error-bg:#fee2e2;--color-notes-orange-tint:#fff1dd;--color-folder-yellow:#f5d773;--color-highlight-yellow:#ffeb78;--font-display:"Inter", 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var(--transition-fast);border:none;justify-content:center;align-items:center;gap:6px;padding:11px 22px;text-decoration:none;display:inline-flex}.apple-pill:active{transform:scale(.95)}.product-shadow{box-shadow:var(--shadow-product)}.btn-primary{font-family:var(--font-body);font-size:var(--text-caption);font-weight:var(--weight-regular);line-height:var(--leading-button);border-radius:var(--radius-pill);background-color:var(--color-primary);color:#fff;cursor:pointer;transition:background var(--transition-fast);border:none;justify-content:center;align-items:center;gap:6px;padding:11px 22px;text-decoration:none;display:inline-flex}.btn-primary:active{transform:scale(.95)}.btn-primary:hover{background-color:var(--color-primary-focus)}