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.btn{border-radius:var(--radius-sm);height:40px;font-family:var(--font-sans);cursor:pointer;border:none;outline:none;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-size:14px;font-weight:500;text-decoration:none;transition:all .15s;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover{background:var(--color-primary-hover)}.btn-ghost{color:var(--color-text-secondary);background:0 0}.btn-ghost:hover{background:var(--color-surface-muted);color:var(--color-text-primary)}.deck-card{background:var(--color-surface);border-radius:var(--radius-md);border:1px solid var(--color-border-subtle);box-shadow:var(--shadow-sm);flex-direction:column;justify-content:space-between;padding:20px;display:flex}.eyebrow-tag{text-transform:uppercase;letter-spacing:.6px;color:var(--color-primary);align-items:center;gap:6px;margin-bottom:12px;font-size:11px;font-weight:700;display:flex}.quiz-question-title{--clamp-lines:3;color:var(--color-text-primary);flex-shrink:0;margin-bottom:12px;font-size:14px;font-weight:600;line-height:1.4}.quiz-choice{border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-surface);width:100%;color:var(--color-text-primary);font-family:var(--font-sans);text-align:left;cursor:pointer;outline:none;align-items:center;gap:10px;padding:8px 12px;font-size:13px;transition:all .15s;display:flex}.quiz-choice:hover,.quiz-choice:focus-visible{background:var(--color-surface-muted);border-color:var(--color-text-secondary)}.quiz-choice.correct{border-color:var(--color-success);background:var(--color-success-bg);color:var(--color-success);font-weight:500}.quiz-choice.incorrect{border-color:var(--color-error);background:var(--color-error-bg);color:var(--color-error)}.quiz-feedback{--clamp-lines:2;flex-shrink:0;min-height:18px;margin-top:6px;font-size:12px;font-weight:500;line-height:1.5}.flashcard-prompt-title{--clamp-lines:9;font-family:var(--font-serif);color:var(--color-text-primary);margin-bottom:6px;font-size:16px;font-weight:600;line-height:1.35}.flashcard-explanation{--clamp-lines:15;color:var(--color-text-primary);font-size:13px;line-height:1.5}.modal-title{font-family:var(--font-serif);color:var(--color-text-primary);margin-bottom:6px;font-size:22px;font-weight:600}.modal-desc{color:var(--color-text-secondary);margin-bottom:var(--space-m);font-size:14px}.modal-actions{margin-top:var(--space-m);justify-content:flex-end;gap:12px;display:flex}.empty-state-card{text-align:center;background:var(--color-surface);border-radius:var(--radius-lg);padding:60px var(--space-l);border:1px solid var(--color-border-subtle);max-width:640px;box-shadow:var(--shadow-sm);margin:40px auto;display:none}.empty-icon-circle{border-radius:var(--radius-pill);background:var(--color-surface-muted);width:64px;height:64px;color:var(--color-primary);justify-content:center;align-items:center;margin-bottom:20px;display:inline-flex}.empty-icon-circle svg{width:32px;height:32px}.empty-state-title{font-family:var(--font-serif);margin-bottom:10px;font-size:24px;font-weight:600}.empty-state-desc{color:var(--color-text-secondary);max-width:460px;margin:0 auto 24px;font-size:15px;line-height:1.5}.clamp-text{-webkit-line-clamp:var(--clamp-lines,2);line-clamp:var(--clamp-lines,2);text-overflow:ellipsis;overflow-wrap:anywhere;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.desktop-only-gate{z-index:1000;background:var(--color-bg-app);justify-content:center;align-items:center;padding:24px 16px;display:flex;position:fixed;inset:0}.desktop-only-card{text-align:center;flex-direction:column;align-items:center;gap:12px;max-width:360px;display:flex}.desktop-only-brand{font-family:var(--font-serif);color:var(--color-primary);font-size:18px}.desktop-only-card h1{font-family:var(--font-serif);color:var(--color-text-primary);margin:0;font-size:24px;line-height:1.3}.desktop-only-card p{color:var(--color-text-secondary);margin:0;font-size:16px}.desktop-only-url{font-family:var(--font-mono);color:var(--color-text-primary)!important}.limit-prompt{border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-surface-muted);color:var(--color-text-primary);flex-direction:column;align-items:flex-start;gap:6px;margin-top:12px;padding:12px 14px;font-size:13px;display:flex}.limit-prompt p{color:var(--color-text-secondary);margin:0}.limit-prompt-actions{gap:8px;display:flex}.notes-conflict-banner,.notes-limit-warning{border-radius:var(--radius-sm);background:var(--color-accent-light);color:var(--color-text-primary);border:1px solid var(--color-border);align-items:center;gap:8px;margin:8px 12px 0;padding:8px 12px;font-size:13px;display:flex}.notes-conflict-banner span{flex:1}.notes-conflict-banner .btn{height:30px;padding:0 10px;font-size:12px}.course-notes-editor{border:1px solid var(--color-primary);border-radius:var(--radius-sm);background:var(--color-surface);padding:8px 12px}.course-notes-editor .course-notes-editing{min-height:120px}.course-notes-editor-bar{justify-content:space-between;align-items:center;margin-top:8px;display:flex}.course-notes-save-status{font-size:12px;font-family:var(--font-mono);color:var(--color-text-secondary)}.rewatch-link{color:var(--color-primary);white-space:nowrap;align-items:center;gap:4px;font-size:12px;font-weight:600;text-decoration:none;display:inline-flex}.rewatch-link:hover{text-decoration:underline}.catalog-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;display:grid}.catalog-card{background:var(--color-surface);border:1px solid var(--color-border-subtle);border-radius:var(--radius-md);cursor:pointer;flex-direction:column;transition:box-shadow .15s,border-color .15s;display:flex;overflow:hidden}.catalog-card:hover,.catalog-card:focus-visible{border-color:var(--color-border);box-shadow:var(--shadow-md);outline:none}.catalog-thumb{aspect-ratio:16/9;background:var(--color-surface-muted);position:relative}.catalog-thumb img{object-fit:cover;width:100%;height:100%;display:block}.catalog-thumb-empty{width:100%;height:100%}.catalog-badge{border-radius:var(--radius-pill);background:var(--color-surface);color:var(--color-primary);box-shadow:var(--shadow-sm);padding:2px 8px;font-size:11px;font-weight:700;position:absolute;top:8px;left:8px}.catalog-card-body{flex:1;padding:12px 14px 4px}.catalog-title{--clamp-lines:2;color:var(--color-text-primary);margin:0 0 6px;font-size:14px;font-weight:600;line-height:1.35}.catalog-meta{color:var(--color-text-secondary);flex-wrap:wrap;gap:2px 10px;font-size:12px;display:flex}.catalog-channel{font-weight:500}.catalog-card-actions{justify-content:flex-end;padding:8px 14px 12px;display:flex}.catalog-card-actions .btn{height:30px;padding:0 12px;font-size:12px}.catalog-section-title{letter-spacing:.06em;text-transform:uppercase;color:var(--color-text-secondary);justify-content:space-between;align-items:baseline;gap:12px;margin:28px 0 12px;font-size:12px;font-weight:700;display:flex}.modal-sheet.catalog-preview{max-width:640px;width:calc(calc(100 * var(--vw)) - 32px);max-height:calc(calc(100 * var(--vh)) - 64px);flex-direction:column;display:flex}.catalog-preview-head{justify-content:space-between;align-items:flex-start;gap:12px;display:flex}.catalog-preview-top{color:var(--color-text-secondary);align-items:flex-start;gap:14px;margin:6px 0 12px;font-size:13px;display:flex}.catalog-preview-thumb{aspect-ratio:16/9;object-fit:cover;border-radius:var(--radius-sm);flex-shrink:0;width:160px}.catalog-preview-facts{flex-direction:column;gap:4px;display:flex}.catalog-yt-link{color:var(--color-primary);font-weight:600;text-decoration:none}.catalog-preview-desc{color:var(--color-text-secondary);margin-bottom:12px;font-size:13px;line-height:1.5}.catalog-preview-desc .clamp-text{--clamp-lines:3}.btn-link{color:var(--color-primary);cursor:pointer;background:0 0;border:none;padding:0;font-size:13px;font-weight:600}.catalog-preview-label{text-transform:uppercase;letter-spacing:.06em;color:var(--color-text-secondary);margin-bottom:6px;font-size:12px;font-weight:700}.catalog-chapter-list{border:1px solid var(--color-border-subtle);border-radius:var(--radius-sm);min-height:80px;max-height:280px;margin:0;padding:0;list-style:none;overflow-y:auto}.catalog-chapter-list li{border-bottom:1px solid var(--color-border-subtle);align-items:baseline;gap:10px;padding:8px 12px;font-size:13px;display:flex}.catalog-chapter-list li:last-child{border-bottom:none}.catalog-chapter-list li.unavailable{opacity:.55}.catalog-chapter-num{font-family:var(--font-mono);color:var(--color-text-secondary)}.catalog-chapter-title{color:var(--color-text-primary);flex:1}.catalog-chapter-time{font-family:var(--font-mono);color:var(--color-text-secondary);font-size:12px}.catalog-chapter-loading{color:var(--color-text-secondary)}.catalog-preview-foot{align-items:center;gap:10px;margin-top:14px;display:flex}.catalog-slots{color:var(--color-text-secondary);flex:1;font-size:12px}@media (max-width:560px){.catalog-preview-top{flex-direction:column}.catalog-preview-thumb{width:100%}}.search-input{width:100%;height:46px;color:var(--color-text-primary);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-md);padding:0 16px;font-size:15px}.search-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light);outline:none}.search-chips{flex-wrap:wrap;gap:8px;margin-top:12px;display:flex}.search-sort{letter-spacing:0;text-transform:none;font-size:12px;font-weight:500}.search-sort select{font:inherit;color:var(--color-text-primary);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:4px 8px}.search-more{text-align:center;color:var(--color-text-secondary);margin-top:20px;font-size:13px}.catalog-skeleton{cursor:default;background:var(--color-surface-muted);min-height:250px}.search-chips .report-chip{padding:6px 14px;font-size:13px}.catalog-divide-row{margin:0 0 12px}.reminder-offer-backdrop{z-index:400;background:#11100f73;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.reminder-offer-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);width:100%;max-width:420px;box-shadow:var(--shadow-lg);padding:22px 24px}.reminder-offer-title{font-family:var(--font-serif);color:var(--color-text-primary);margin:0 0 8px;font-size:20px;font-weight:600}.reminder-offer-text{color:var(--color-text-primary);margin:0 0 10px;font-size:14px;line-height:1.5}.reminder-offer-list{color:var(--color-text-secondary);margin:0 0 18px;padding-left:20px;font-size:13px;line-height:1.7;list-style:outside}.reminder-offer-actions{justify-content:flex-end;gap:10px;display:flex}.reminder-offer-toast{z-index:410;max-width:calc(calc(100 * var(--vw)) - 32px);border-radius:var(--radius-pill);background:var(--color-surface);border:1px solid var(--color-border);box-shadow:var(--shadow-lg);color:var(--color-text-primary);padding:10px 16px;font-size:13px;position:fixed;bottom:28px;left:50%;transform:translate(-50%)}.certificate-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);padding:18px 20px}.certificate-card.celebrate{border-color:var(--color-primary)}.certificate-card-cheer{color:var(--color-primary);margin:0 0 12px;font-size:14px;font-weight:600}.certificate-card-head{align-items:flex-start;gap:12px;display:flex}.certificate-card-medal{font-size:26px;line-height:1}.certificate-card-title{font-family:var(--font-serif);color:var(--color-text-primary);margin:0 0 4px;font-size:18px;font-weight:600}.certificate-card-meta{color:var(--color-text-secondary);margin:0;font-size:13px}.certificate-card-actions{flex-wrap:wrap;gap:8px;margin-top:14px;display:flex}.certificate-card-hint{color:var(--color-text-secondary);margin:10px 0 0;font-size:12px}.feedback-counter{color:var(--color-text-secondary);font-variant-numeric:tabular-nums;align-self:flex-end;font-size:11px}.feedback-attach{color:var(--color-primary);cursor:pointer;align-items:center;gap:6px;font-size:13px;display:inline-flex}.feedback-attach input{opacity:0;width:1px;height:1px;position:absolute}.feedback-attach small{color:var(--color-text-secondary)}.feedback-attach-remove{color:var(--color-text-secondary);cursor:pointer;background:0 0;border:none;align-self:flex-start;padding:0;font-size:12px;text-decoration:underline}.nav-pro-badge{border-radius:var(--radius-pill);background:var(--color-primary);color:#fff;letter-spacing:.04em;padding:1px 8px;font-size:12px;font-weight:700;display:inline-block}.modal-sheet,.report-popover-card,.account-modal{box-sizing:border-box;overscroll-behavior:contain;scrollbar-width:thin;max-height:100%;overflow-y:auto}#toast{background:var(--color-primary);color:#fff;border-radius:var(--radius-pill);box-shadow:var(--shadow-lg);opacity:0;z-index:9999;padding:12px 20px;font-size:14px;transition:all .25s;position:fixed;bottom:24px;right:24px;transform:translateY(100px)}#toast.show{opacity:1;transform:translateY(0)}.logo-mark{flex-shrink:0;display:block}.logo-board{fill:var(--color-primary)}.logo-chalk{fill:none;stroke:var(--color-bg-app);stroke-linecap:round;stroke-linejoin:round}.logo-ledge{fill:var(--color-text-primary)}[data-theme=dark] .logo-ledge{opacity:.85}.logo-stub{fill:var(--color-accent)}.logo-word{font-family:var(--font-logo), "Nunito", system-ui, sans-serif;letter-spacing:-.01em;white-space:nowrap;color:var(--color-text-primary);font-weight:800;line-height:1}.logo-i{display:inline-block;position:relative}.logo-i:after{content:"";background:var(--color-accent);border-radius:52% 48% 55% 45%/50% 56% 44% 50%;width:.17em;height:.16em;position:absolute;top:.09em;left:50%;transform:translate(-46%)rotate(-12deg)}