@layer legacy{:root{--color-primary: #667eea;--color-accent: #764ba2;--gradient-brand: linear-gradient(135deg, #667eea, #764ba2);--color-error: #C4302B;--color-success: #38a169;--color-warning: #dd6b20;--color-text: #333;--color-text-secondary: #5A5A5A;--color-text-muted: #5A5A5A;--color-border: #e2e8f0;--color-bg: #f5f5f5;--color-bg-tinted: #f8f9ff;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--content-max-width: 600px;--font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;--board-green: #2F4A3C;--board-green-deep: #243B30;--board-navy: #1B2A4E;--board-brick: #6B3030;--board-ochre: #8B6F2B;--board-plum: #5B2D4E;--wood-light: #A06A3A;--wood-mid: #8B5A2B;--wood-dark: #6B4220;--wood-deep: #4B2D14;--wall-cream: #E8DFCE;--wall-warm: #EFE6D3;--parchment: #F4EBD0;--parchment-edge: #D9C9A4;--chalk-white: #F4F4EF;--chalk-white-soft: rgba(244, 244, 239, .88);--chalk-white-dim: rgba(244, 244, 239, .68);--chalk-coral: #F4A7A0;--chalk-gold: #F4C76C;--chalk-pink: #F0B5C8;--chalk-yellow: #F2E27D;--chalk-mint: #8EDACE;--chalk-sky: #8DBFE5;--chalk-lavender: #C3A8E3;--cb-action-primary: #5B6FE0;--cb-action-primary-hover: #4858C5;--cb-action-secondary: #F4EBD0;--cb-action-secondary-ink: #2B2B2B;--cb-ink-dark: #1F1F1F;--cb-ink-mid: #3A3A3A;--cb-ink-mute: #6B6B6B;--font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", sans-serif;--font-reading: "Lexend Deca", "Lexend", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", sans-serif;--font-hand: "Caveat", "Architects Daughter", cursive;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;--fs-xs: .75rem;--fs-sm: .875rem;--fs-md: 1rem;--fs-lg: 1.125rem;--fs-xl: 1.375rem;--fs-2xl: 1.75rem;--fs-3xl: 2.25rem;--fs-4xl: 3rem;--type-caption: var(--fs-xs);--type-label: var(--fs-sm);--type-body: var(--fs-md);--type-option: var(--fs-md);--type-body-reading: var(--fs-lg);--type-stem: var(--fs-lg);--type-card-title: var(--fs-xl);--type-page-title: var(--fs-2xl);--type-spotlight: var(--fs-2xl);--type-display: var(--fs-3xl);--sp-1: 4px;--sp-2: 8px;--sp-3: 12px;--sp-4: 16px;--sp-5: 24px;--sp-6: 32px;--sp-7: 48px;--sp-8: 64px;--r-sm: 8px;--r-md: 14px;--r-lg: 20px;--r-pill: 999px;--shadow-frame: 0 12px 28px rgba(20, 14, 6, .35), 0 2px 4px rgba(20, 14, 6, .25), inset 0 1px 0 rgba(255, 240, 200, .25), inset 0 -3px 8px rgba(0, 0, 0, .3);--shadow-board-inset: inset 0 0 60px rgba(0, 0, 0, .35), inset 0 0 2px rgba(0, 0, 0, .5);--shadow-chalk-piece: 0 2px 3px rgba(0, 0, 0, .35), inset 0 1px 0 rgba(255, 255, 255, .4);--shadow-pill: 0 4px 10px rgba(0, 0, 0, .25), inset 0 1px 0 rgba(255, 255, 255, .15);--shadow-parchment: inset 0 0 0 1px rgba(139, 105, 40, .2), inset 0 2px 4px rgba(139, 105, 40, .15), 0 2px 6px rgba(20, 14, 6, .45)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--color-bg)}.app{display:flex;flex-direction:column;height:100vh;height:100dvh;max-width:800px;margin:0 auto;background:#fff;box-shadow:0 0 20px #0000001a;overflow:hidden}.nav-bar{display:flex;align-items:center;padding:calc(8px + var(--sa-top)) 12px 8px;border-bottom:1px solid #e0e0e0;background:#fff;min-height:44px;gap:8px;flex-shrink:0;z-index:10}.nav-home-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:none;border:none;border-radius:8px;color:#555;cursor:pointer;flex-shrink:0;transition:all .2s}.nav-home-btn:hover{background:#f0f0f0;color:#333}.nav-center{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;font-size:var(--fs-md);font-weight:600;background:linear-gradient(90deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nav-logo{flex-shrink:0;height:28px;width:auto;object-fit:contain}.nav-user-menu{position:relative;flex-shrink:0}.nav-user-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:none;border:1px solid #ddd;border-radius:50%;color:#555;cursor:pointer;transition:all .2s}.nav-user-btn:hover{background:#f0f0f0;border-color:#ccc;color:#333}.nav-dropdown{position:absolute;top:42px;right:0;background:#fff;border-radius:8px;box-shadow:0 4px 12px #00000026;min-width:160px;z-index:100;overflow:hidden}.nav-action-btn{padding:4px 10px;background:#f5f5f5;color:#555;border:1px solid #e0e0e0;border-radius:4px;font-size:var(--fs-xs);font-weight:600;cursor:pointer;transition:all .2s}.nav-action-btn:hover{background:#eee;border-color:#ccc;color:#333}@keyframes spin-icon{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.selection-container{flex:1;padding:2rem;overflow-y:auto}.selection-step{max-width:600px;margin:0 auto}.selection-step h2{margin-bottom:1.5rem;color:#333;font-size:var(--fs-xl)}.back-button{margin-bottom:1rem;padding:.5rem 1rem;background:transparent;border:1px solid #ccc;border-radius:6px;font-size:var(--fs-sm);color:#666;cursor:pointer;transition:all .2s}.back-button:hover{background:#f5f5f5;border-color:#5a5a5a}.app-content{--app-content-padding: 24px;flex:1;padding:var(--app-content-padding);padding-bottom:calc(var(--app-content-padding) + var(--sa-bottom));overflow-y:auto}.app-content-inner{max-width:var(--content-max-width);margin:0 auto}.nav-dropdown-item{display:block;width:100%;padding:10px 16px;border:none;background:none;text-align:left;font-size:var(--fs-sm);cursor:pointer;color:var(--color-text);font-family:inherit}.nav-dropdown-item:hover{background:var(--color-bg-tinted)}.nav-dropdown-item--danger{color:var(--color-error)}.page-subtitle{color:var(--color-text-secondary);font-size:var(--fs-sm);margin-bottom:1.5rem}.page-loading{text-align:center;padding:2rem;color:var(--color-text-muted)}.topic-status{display:inline-flex;align-items:center;gap:4px;font-size:var(--fs-xs);font-weight:600;padding:2px 6px;border-radius:8px;margin-left:8px}.topic-status.studied{color:#38a169;background:#f0fff4}.topic-status.not_started{color:#5a5a5a;background:#f5f5f5}.vt-toggle{padding:4px 10px;background:#fff3;color:#fff;border:1px solid rgba(255,255,255,.4);border-radius:4px;font-size:var(--fs-xs);font-weight:600;cursor:pointer;transition:background .2s}.vt-toggle:hover{background:#ffffff59}.focus-audio-btn{background:#f0f0f0;border:none;border-radius:50%;width:36px;height:36px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#555;transition:background .15s,color .15s}.focus-audio-btn:hover{background:#e0e0e0}.focus-audio-btn.playing{background:var(--color-primary);color:#fff}.focus-audio-btn.playing:hover{background:#5568d0}.focus-track-container{flex:1;overflow:hidden;touch-action:pan-y}.focus-track{display:flex;height:100%;will-change:transform}.focus-slide{flex:0 0 100%;width:100%;min-width:0;overflow-x:hidden;overflow-y:auto;padding:24px 20px 32px;-webkit-overflow-scrolling:touch;box-sizing:border-box}.toggle-switch{position:relative;display:inline-block;width:48px;height:26px;flex-shrink:0}.toggle-switch input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background:#ccc;border-radius:26px;transition:background .25s}.toggle-slider:before{content:"";position:absolute;height:20px;width:20px;left:3px;bottom:3px;background:#fff;border-radius:50%;transition:transform .25s}.toggle-switch input:checked+.toggle-slider{background:var(--color-primary)}.toggle-switch input:checked+.toggle-slider:before{transform:translate(22px)}.toggle-switch input:disabled+.toggle-slider{opacity:.5;cursor:not-allowed}.confirm-dialog-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;z-index:10000;padding:16px}.confirm-dialog{background:#fff;border-radius:16px;padding:24px;max-width:380px;width:100%;box-shadow:0 20px 60px #0000004d}.confirm-dialog-title{margin:0 0 8px;font-size:var(--fs-lg);font-weight:700;color:#1a202c}.confirm-dialog-message{margin:0 0 20px;font-size:var(--fs-md);color:#4a5568;line-height:1.5}.confirm-dialog-actions{display:flex;gap:12px;justify-content:flex-end}.confirm-dialog-btn{padding:10px 18px;min-height:44px;min-width:88px;border-radius:10px;font-size:var(--fs-sm);font-weight:700;cursor:pointer;border:none;transition:background .15s}.confirm-dialog-btn--cancel{background:#f0f0f0;color:#4a5568}.confirm-dialog-btn--cancel:hover{background:#e5e5e5}.confirm-dialog-btn--confirm{background:var(--color-primary);color:#fff}.confirm-dialog-btn--confirm:hover{background:#7a8ef0}.confirm-dialog-btn--danger{background:transparent;color:var(--color-error);border:2px solid var(--color-error)}.confirm-dialog-btn--danger:hover{background:#c4302b14}.visual-canvas{display:flex;justify-content:center;align-items:center}@keyframes visualFadeIn{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@keyframes visualPopIn{0%{opacity:0;transform:scale(0)}70%{transform:scale(1.2)}to{opacity:1;transform:scale(1)}}.visual-fade-in{animation:visualFadeIn .6s ease-out both}.visual-pop-in{animation:visualPopIn .5s ease-out both}.explanation-card-title{font-size:var(--type-card-title);font-weight:600;line-height:1.3;color:#111827;margin:0}.explanation-card-content{font-family:var(--font-reading);font-size:var(--type-body-reading);line-height:1.65;letter-spacing:.005em;color:#374151;overflow-wrap:break-word;word-wrap:break-word}.explanation-card-content p{margin:.4rem 0}@keyframes tw-arrive{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes tw-speak-glow{0%,to{text-shadow:0 0 0 rgba(102,126,234,0)}50%{text-shadow:0 0 16px rgba(102,126,234,.4)}}.explanation-actions{display:flex;flex-direction:column;gap:.5rem;width:100%}.match-item.selected{border-color:var(--color-primary);background:#ede9fe;font-weight:600;box-shadow:0 0 0 2px #667eea4d}.match-item.matched{border-color:#059669;background:#d1fae5;color:#065f46;cursor:default}.match-item.wrong{animation:match-shake .4s ease;border-color:#ef4444;background:#fee2e2}@keyframes match-shake{0%,to{transform:translate(0)}20%{transform:translate(-6px)}40%{transform:translate(6px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}@media (prefers-reduced-motion: reduce){.match-item.wrong,.sort-bucket.wrong,.seq-item.wrong,.error-step.wrong,.swipe-card.wrong{animation:none}}.interaction-instruction{font-family:var(--font-reading);font-size:var(--type-caption, .8rem);font-weight:600;letter-spacing:.02em;text-transform:none;color:#6b7280;text-align:center;line-height:1.4;margin-bottom:6px}.sort-bucket.active{border-color:var(--color-primary);background:#ede9fe;border-style:solid}.sort-bucket.wrong{animation:match-shake .4s ease;border-color:#ef4444;background:#fee2e2}.sort-item.selected{border-color:var(--color-primary);background:#ede9fe;font-weight:600;box-shadow:0 0 0 2px #667eea4d}.seq-slot.next{border-color:var(--color-primary);border-style:solid;background:#ede9fe}.seq-slot.next .seq-slot-number{background:var(--color-primary)}.seq-item.wrong{animation:match-shake .4s ease;border-color:#ef4444;background:#fee2e2}.error-step.correct{border-color:#059669;background:#d1fae5;color:#065f46}.error-step.wrong{animation:match-shake .4s ease;border-color:#ef4444;background:#fee2e2}.error-step.correct .error-step-num{background:#ef4444}.swipe-card.wrong{animation:match-shake .4s ease;border-color:#ef4444;background:#fee2e2}body:has(.app.chalkboard-active){background:var(--wall-cream)}.app.chalkboard-active{background:var(--wood-dark);box-shadow:0 0 28px #140e0666}.chalkboard-active .nav-bar{background:linear-gradient(180deg,var(--wood-mid) 0%,var(--wood-deep) 100%);border-bottom:1px solid rgba(0,0,0,.35);box-shadow:inset 0 -1px #ffc88c1f;color:var(--chalk-white)}.chalkboard-active .nav-home-btn,.chalkboard-active .nav-user-btn{color:var(--chalk-white)}.chalkboard-active .nav-home-btn:hover,.chalkboard-active .nav-user-btn:hover{background:#ffffff1a}.chalkboard-active .nav-center{color:var(--chalk-white)}.chalkboard-active .nav-breadcrumb-sep{color:var(--chalk-white-dim)}.chalkboard-active .nav-dropdown{background:#fbf6e8}.chapter-finishline-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:calc(32px + var(--sa-top)) 26px calc(40px + var(--sa-bottom));background:linear-gradient(180deg,var(--board-green) 0%,var(--board-green-deep) 100%);animation:chapter-finishline-in .4s ease-out both}.chapter-finishline-overlay:has(>.guide-moment){flex-direction:column;gap:clamp(12px,2vh,20px);justify-content:safe center;overflow-x:hidden;overflow-y:auto}.chapter-finishline-overlay:has(>.guide-moment)>.guide-moment,.chapter-finishline-overlay:has(>.guide-moment)>.chapter-finishline{flex:0 0 auto;max-width:100%}.chapter-finishline-overlay:has(>.guide-moment)>.guide-moment{margin:0}@keyframes chapter-finishline-in{0%{opacity:0}to{opacity:1}}@keyframes chapter-badge-pop{0%{opacity:0;transform:scale(.4)}to{opacity:1;transform:scale(1)}}.lean-mapbtn{margin-right:2px}.chalkboard-active .focus-track-container{position:relative;z-index:1}.chalkboard-active .focus-audio-btn{background:#f4f4ef1a;color:var(--chalk-white);border:1px solid rgba(244,244,239,.25)}.chalkboard-active .focus-audio-btn:hover{background:#f4f4ef2e}.chalkboard-active .focus-audio-btn.playing{background:var(--chalk-gold);color:var(--board-green-deep);border-color:var(--chalk-gold)}.chalkboard-active .checkin-instruction,.chalkboard-active .match-instruction{color:var(--chalk-white);font-family:var(--font-reading);font-weight:600;text-shadow:0 0 1px rgba(244,244,239,.35),0 1px 0 rgba(0,0,0,.25)}.chalkboard-active .checkin-hint,.chalkboard-active .match-hint{color:var(--chalk-gold);background:#f4c76c1a;border:1px dashed rgba(244,199,108,.45)}.chalkboard-active .checkin-success-message,.chalkboard-active .match-success-message{color:var(--chalk-white);background:#8edace26;border:1px solid var(--chalk-mint);text-shadow:0 0 4px rgba(142,218,206,.35)}.chalkboard-active .sort-item,.chalkboard-active .seq-item,.chalkboard-active .error-step,.chalkboard-active .match-item,.chalkboard-active .swipe-btn{background:#f4f4ef0d;border:1.5px dashed rgba(244,244,239,.35);color:var(--chalk-white);font-family:var(--font-reading)}.chalkboard-active .sort-item:hover:not(:disabled),.chalkboard-active .seq-item:hover:not(:disabled),.chalkboard-active .error-step:hover:not(:disabled),.chalkboard-active .match-item:hover:not(:disabled),.chalkboard-active .swipe-btn:hover:not(:disabled){background:#f4f4ef1a;border-color:var(--chalk-white-dim);border-style:solid}.chalkboard-active .error-step.correct,.chalkboard-active .match-item.matched{background:#8edace2e;border:1.5px solid var(--chalk-mint);color:var(--chalk-white);box-shadow:0 0 14px #8edace4d}.chalkboard-active .match-item.selected,.chalkboard-active .sort-item.selected{background:#f4c76c1f;border:1.5px solid var(--chalk-gold);color:var(--chalk-white);box-shadow:0 0 0 2px #f4c76c26}.chalkboard-active .sort-bucket.wrong,.chalkboard-active .seq-item.wrong,.chalkboard-active .error-step.wrong,.chalkboard-active .match-item.wrong,.chalkboard-active .swipe-card.wrong{background:#f4a7a026;border:1.5px solid var(--chalk-coral);color:var(--chalk-white)}.chalkboard-active .match-item.auto-revealed,.chalkboard-active .sort-placed-item.auto-revealed{background:#f4c76c1f;border-color:var(--chalk-gold);color:var(--chalk-white)}.chalkboard-active .sort-bucket{background:#f4f4ef0a;border:2px dashed rgba(244,244,239,.35)}.chalkboard-active .sort-bucket.active{background:#f4c76c1a;border-color:var(--chalk-gold);border-style:solid}.chalkboard-active .sort-bucket-label{color:var(--chalk-white-soft);border-bottom-color:#f4f4ef40}.chalkboard-active .sort-placed-item{background:#8edace26;color:var(--chalk-white)}.chalkboard-active .seq-slot{background:#f4f4ef0a;border:2px dashed rgba(244,244,239,.3)}.chalkboard-active .seq-slot.next{background:#f4c76c1a;border-color:var(--chalk-gold);border-style:solid}.chalkboard-active .seq-slot.filled{background:#8edace26;border-color:var(--chalk-mint);border-style:solid}.chalkboard-active .seq-slot-number{background:#f4f4ef40;color:var(--chalk-white)}.chalkboard-active .seq-slot.next .seq-slot-number{background:var(--chalk-gold);color:var(--board-green-deep)}.chalkboard-active .seq-slot.filled .seq-slot-number{background:var(--chalk-mint);color:var(--board-green-deep)}.chalkboard-active .seq-slot-value{color:var(--chalk-white)}.chalkboard-active .error-step-num{background:#f4f4ef2e;color:var(--chalk-white)}.chalkboard-active .error-step.correct .error-step-num{background:var(--chalk-mint);color:var(--board-green-deep)}.chalkboard-active .error-step-text{color:var(--chalk-white);font-family:var(--font-mono)}.chalkboard-active .swipe-labels{color:var(--chalk-white)}.chalkboard-active .swipe-label-left,.chalkboard-active .swipe-label-right{background:#f4f4ef0f;border:1.5px dashed rgba(244,244,239,.35);color:var(--chalk-white)}.chalkboard-active .swipe-card{background:#f4f4ef1a;border:1.5px solid rgba(244,244,239,.35);color:var(--chalk-white);font-family:var(--font-reading)}.chalkboard-active .swipe-card-text{color:var(--chalk-white)}.chalkboard-active .swipe-card-counter{color:var(--chalk-white-dim)}.chalkboard-active .swipe-btn-left,.chalkboard-active .swipe-btn-right{background:#f4f4ef14;border:1.5px solid var(--chalk-white-dim);color:var(--chalk-white)}.chalkboard-active .app-content{background:transparent}.chalkboard-active .selection-step{position:relative;padding:var(--sp-5);border-radius:var(--r-md);background:linear-gradient(180deg,var(--board-green) 0%,var(--board-green-deep) 100%);box-shadow:var(--shadow-board-inset);isolation:isolate;overflow:hidden}.chalkboard-active .selection-step:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;pointer-events:none;background:radial-gradient(ellipse at center,transparent 50%,rgba(0,0,0,.35) 100%),radial-gradient(circle at 18% 22%,rgba(244,244,239,.04) 0,transparent 18%),radial-gradient(circle at 82% 78%,rgba(244,244,239,.03) 0,transparent 15%)}.chalkboard-active .selection-step>*{position:relative;z-index:1}.chalkboard-active .selection-step h2{font-family:var(--font-body);font-weight:600;font-size:var(--fs-2xl);line-height:1.25;color:var(--chalk-white);margin:0 0 var(--sp-4);text-shadow:0 0 1px rgba(244,244,239,.3),0 1px 0 rgba(0,0,0,.25)}.chalkboard-active .selection-step h3{font-family:var(--font-body);color:var(--chalk-white);font-size:var(--fs-lg);margin:var(--sp-3) 0 var(--sp-2);font-weight:600}.chalkboard-active .selection-step>p{color:var(--chalk-white-soft);font-family:var(--font-body)}.chalkboard-active 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var(--ux-font-serif);--ux-text-date: 400 1.0625rem/2rem var(--ux-font-serif);--ux-text-index: italic 400 .9375rem/1.25rem var(--ux-font-serif);--ux-text-celebration: 600 1.875rem/2.5rem var(--ux-font-sans);--ux-text-flashcard: 500 1.875rem/2.1875rem var(--ux-font-sans);--ux-text-feedback-title: 600 1.5rem/2.25rem var(--ux-font-sans);--ux-text-stem: 400 1.5rem/2.25rem var(--ux-font-sans);--ux-text-digit: 500 1.5rem/1.5625rem var(--ux-font-sans);--ux-text-sheet-title: 500 1.5rem/1.5625rem var(--ux-font-sans);--ux-text-cycle: 500 1.5rem/2.0625rem var(--ux-font-sans);--ux-text-narration: 500 1.375rem/1.875rem var(--ux-font-sans);--ux-text-card-title: 500 1.25rem/1.5625rem var(--ux-font-sans);--ux-text-option: 400 1.25rem/1.875rem var(--ux-font-sans);--ux-text-body: 400 1.0625rem/1.75rem var(--ux-font-sans);--ux-text-label: 500 1.0625rem/1.5625rem var(--ux-font-sans);--ux-text-button: 600 1.0625rem/1.5625rem var(--ux-font-sans);--ux-text-small: 400 .9375rem/1.5625rem 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.lean-frame-input-spot:focus-visible{outline-color:var(--ux-color-brand-primary)}.ux-lesson-lightbox__zoom{flex:none}@media (prefers-reduced-motion: no-preference){.ux-lesson-lightbox__picture{transition:width .22s}}.ux-lesson-picture{width:100%}.ux-lesson-picture--hidden{display:none}.ux-lesson-picture__stage{width:min(100%,50vh * 10 / 7);width:min(100%,50dvh * 10 / 7);margin-inline:auto}.ux-lesson-picture__actions{display:flex;align-items:center;justify-content:flex-end;min-height:var(--ux-size-round-small);margin-bottom:var(--ux-space-1)}.ux-lesson-picture__frame{position:relative;width:100%;aspect-ratio:10 / 7;border-radius:var(--ux-radius-tile);overflow:hidden;background:var(--ux-color-background-surface);cursor:zoom-in}.ux-lesson-picture__frame .lean-frame-pic img{max-width:100%;max-height:100%;padding:0;border-radius:0;background:none;box-shadow:none}.ux-lesson-picture__frame .lean-frame-input:focus-visible,.ux-lesson-picture__frame .lean-frame-input-spot:focus-visible{outline-color:var(--ux-color-brand-primary)}.ux-lesson-picture__tutor{width:min(70%,50vh);width:min(70%,50dvh);aspect-ratio:1 / 1;margin-inline:auto;border-radius:var(--ux-radius-tile);overflow:hidden}.ux-lesson-picture__tutor .tutor-frame{width:100%;height:100%;max-width:none;max-height:none;border-radius:0;background:var(--ux-color-background-subtle)}.ux-lesson-picture__tutor .tutor-frame__start{margin:auto;padding:var(--ux-space-3) var(--ux-space-5);border-radius:var(--ux-radius-pill);background:var(--ux-color-action-neutral);color:var(--ux-color-text-inverse);font:var(--ux-text-button)}.ux-lesson.ux-page{padding-bottom:0}.ux-lesson-bar .ux-top-bar__start{flex:1 1 auto;min-width:0}.ux-lesson-bar__close{display:inline-flex;flex:none;align-items:center;justify-content:center;width:var(--ux-size-tap);height:var(--ux-size-tap);margin-block:calc((var(--ux-size-top-bar) - var(--ux-size-tap)) / 2);margin-inline:calc(var(--ux-space-1) + (16px - var(--ux-size-tap)) / 2) calc((16px - var(--ux-size-tap)) / 2);border-radius:var(--ux-radius-pill);color:var(--ux-color-icon-primary)}.ux-lesson-notice{margin-top:var(--ux-space-3);font:var(--ux-text-small);color:var(--ux-color-text-primary)}.ux-lesson-notice--error{color:var(--ux-color-text-error)}.ux-lesson .ux-lesson-picture{flex:none;margin-top:var(--ux-space-4)}.ux-lesson__lane{display:flex;flex:1 1 auto;flex-direction:column;width:min(100%,50vh * 10 / 7);width:min(100%,50dvh * 10 / 7);min-height:calc(var(--ux-size-round) + var(--ux-space-4));margin-inline:auto}.ux-lesson__lane--in-panel,.ux-lesson__lane--check-in{flex:none;width:100%;max-width:var(--ux-column);height:calc(var(--ux-size-round) + var(--ux-space-4));min-height:0;padding-bottom:var(--ux-space-4)}.ux-lesson__lane--check-in.ux-lesson__lane--folded{height:0;padding-bottom:0}.ux-lesson .ux-lesson-panel{flex:1 1 auto;margin-top:var(--ux-space-4);margin-inline:calc(-1 * (var(--ux-gutter-cards) + var(--sa-left))) calc(-1 * (var(--ux-gutter-cards) + var(--sa-right)))}.ux-lesson--with-picture .ux-lesson-panel{flex:0 1 var(--ux-size-lesson-panel);margin-top:0}.ux-lesson .ux-lesson-panel--collapsed{flex:none;margin-top:auto}.ux-lesson .ux-lesson-checkins{flex:1 1 auto}