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(prefers-color-scheme:dark){.activity-combobox__input{color:#fff;background-color:#2d2d2d;border-color:#555}.activity-combobox__input:focus{border-color:#0d6efd}.activity-combobox__input::placeholder{color:#aaa}.activity-combobox__dropdown{background:#2d2d2d;border-color:#555}.activity-combobox__option{color:#fff;border-bottom-color:#444}.activity-combobox__option:hover,.activity-combobox__option--highlighted{background-color:#3d3d3d}.activity-combobox__option--highlighted{background-color:#1e3a5f}.activity-combobox__no-options,.activity-combobox__toggle{color:#aaa}.activity-combobox__toggle:hover{color:#fff}}.chat-image-modal-container{border-radius:var(--border-radius-01);background-color:var(--color-background-secondary);justify-content:center;align-items:center;width:100%;min-height:300px;padding:20px;display:flex;position:relative}.chat-image-modal-container .chat-image-modal__image{object-fit:contain;width:auto;max-width:100%;height:auto;max-height:calc(80vh - 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.chat-image-modal__download-button{padding:6px;top:10px;right:10px}.chat-image-modal-container .chat-image-modal__download-button svg{width:18px;height:18px}}.chat-message{margin-bottom:10px;display:block;position:relative}.chat-bubble{gap:8px;margin-bottom:0;display:flex}.chat-bubble__avatar{background-color:transparent;background-image:var(--tangerine-ai-bot);background-position:50%;background-repeat:no-repeat;background-size:cover;border-radius:0%;flex-shrink:0;justify-content:center;align-self:flex-end;align-items:center;width:32px;height:32px;margin-bottom:0;display:flex;overflow:hidden}.chat-bubble__avatar--error{background-image:var(--tangerine-ai-bot-error)}.chat-bubble__content{flex-direction:column;flex:1;align-items:flex-start;gap:8px;display:flex}.chat-bubble__message-group{flex-direction:column;align-items:flex-start;width:100%;display:flex}.chat-bubble__message{word-wrap:break-word;color:#333;border:1px solid #e0e0e0;border-radius:8px;flex:1;font-size:16px;line-height:24px}.chat-bubble__message-content{padding:8px}.chat-bubble__message .markdown-container p{margin-bottom:.5rem}.chat-bubble__message .markdown-container p:last-child{margin-bottom:0}.chat-bubble__message .chat-d3-card{width:100%}.chat-bubble__message .chat-d3-card:first-child{margin-top:0}.chat-bubble__message .chat-d3-card:last-child{margin-bottom:0}.chat-bubble__image{margin-bottom:8px;padding:0 8px}.chat-bubble__image img{cursor:pointer;border-radius:8px;max-width:100%;max-height:300px;display:block}.chat-bubble__attachments{flex-direction:column;gap:8px;display:flex}.chat-bubble__attachments .chat-bubble__image{margin-bottom:0}.chat-bubble--bot .chat-bubble__content,.chat-bubble--bot .chat-bubble__message-group{width:100%}.chat-bubble--bot .chat-bubble__message{background-color:#fff;border-radius:8px 8px 8px 0;width:100%}.chat-bubble--user{flex-direction:row-reverse}.chat-bubble--user .chat-bubble__content{flex-direction:column;align-items:flex-end;display:flex}.chat-bubble--user .chat-bubble__message-group{align-self:flex-end;width:auto;max-width:80%}.chat-bubble--user .chat-bubble__message{background-color:var(--color-tangerine-ai-lighter,#d068d0);border:1px solid var(--color-tangerine-ai-light,#f0c0f0);color:#333;border-radius:8px 8px 0;width:100%}.chat-bubble--just-posted .chat-bubble__message{border-style:solid;border-width:1px;border-image:linear-gradient(111.12deg,var(--color-tangerine-ai,#bc3ebc)12.58%,var(--color-tangerine-ai-dark,#741571)100%)1}.chat-bubble__tool-indicators{flex-direction:column;gap:8px;width:100%;display:flex}.chat-message__bubble--error .chat-bubble__message{background:#fef0ef;border:1px solid #e04949}.chat-message--streaming .chat-bubble__content .typing-indicator{background-color:#fff;border:1px solid #f2f2f2;border-radius:8px 8px 8px 0;width:100%;padding:12px 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.icon--color-default{color:#4e4e4e}.topic-ranking-section__view-toggle-btn--active{color:#333;background-color:#fff}.topic-ranking-section__view-toggle-btn--active .icon--color-default{color:var(--color-tangerine-ai,#bc3ebc)}.topic-ranking-section__view-toggle-btn--active:hover:not(:disabled) .icon--color-default{color:var(--color-tangerine-ai-dark,#741571)}.topic-ranking-section__view-toggle-btn:disabled{opacity:.5;cursor:not-allowed}.topic-ranking-section__filters-row{justify-content:space-between;align-items:flex-start;gap:24px;display:flex}.topic-ranking-section__description{font-family:var(--font-second);color:#4e4e4e;flex:1;min-width:0;margin:0;font-size:16px;font-weight:400;line-height:20px}.topic-ranking-section__filters{flex-shrink:0;gap:8px;display:flex}.topic-ranking-section__filter{flex-direction:column;gap:2px;min-width:242px;display:flex}.topic-ranking-section__filter-label{font-family:var(--font-second);color:#4e4e4e;font-size:16px;font-weight:400;line-height:24px}.topic-ranking-section__list{flex-direction:column;display:flex}.topic-ranking-section__load-more-btn{font-family:var(--font-first);color:var(--color-first);border:1px solid var(--color-first);cursor:pointer;white-space:nowrap;border-radius:8px;justify-content:center;align-self:center;align-items:center;gap:8px;padding:8px 12px;font-size:18px;font-weight:700;line-height:22px;transition:background-color .2s;display:flex}.topic-ranking-section__load-more-btn:hover{background-color:var(--color-first-alpha)}.topic-ranking-section__load-more-btn .icon--color-default{color:var(--color-first)}.topic-ranking-section__load-more-btn #loading__svg{width:22px;height:22px}.topic-ranking-section__loading{justify-content:center;align-items:center;min-height:200px;display:flex}.topic-ranking-section__empty{font-family:var(--font-second);color:#767676;text-align:center;margin:0;padding:24px 0;font-size:14px}.generating-robot{--generating-robot-image-size:8.125rem;justify-content:center;align-items:center;display:flex}.generating-robot__image{width:var(--generating-robot-image-size);height:var(--generating-robot-image-size);background-image:var(--tangerine-ai-bot-generating);background-position:50%;background-repeat:no-repeat;background-size:contain;max-width:100%;animation:3s ease-in-out infinite generating-robot-float}@keyframes generating-robot-float{0%{transform:translateY(0)}50%{transform:translateY(-8%)}to{transform:translateY(0)}}.practice-lesson-selection-dialog{--practice-lesson-selection-dialog-tree-max-height:20rem;--practice-lesson-selection-dialog-checkbox-size:1.25rem;--practice-lesson-selection-dialog-mascot-size:3.5rem;--practice-lesson-selection-dialog-lesson-indent:calc(var(--ui-space-md) + var(--practice-lesson-selection-dialog-checkbox-size) + var(--ui-space-sm))}.practice-lesson-selection-dialog__content{gap:var(--ui-space-md);padding:0 0 var(--ui-space-md)0;flex-direction:column;display:flex}.practice-lesson-selection-dialog__section{gap:var(--ui-space-xxs);flex-direction:column;display:flex}.practice-lesson-selection-dialog__section-label{font-family:var(--ui-font-family-body);font-weight:var(--ui-font-weight-bold);font-size:var(--ui-font-size-14);line-height:var(--ui-line-height-20);color:var(--ui-color-neutral-grey-500);text-transform:uppercase}.practice-lesson-selection-dialog__section-subtitle{font-family:var(--ui-font-family-body);font-weight:var(--ui-font-weight-medium);font-size:var(--ui-font-size-14);line-height:var(--ui-line-height-20);color:var(--ui-color-text-default)}.practice-lesson-selection-dialog__box{border:var(--ui-stroke-1)solid var(--ui-color-neutral-grey-300);border-radius:var(--ui-radius-xl);overflow:hidden}.practice-lesson-selection-dialog__search{padding:var(--ui-space-sm)var(--ui-space-md);background-color:var(--ui-color-neutral-grey-100);border-bottom:var(--ui-stroke-1)solid var(--ui-color-neutral-grey-300);position:relative}.practice-lesson-selection-dialog__search-input{padding:var(--ui-space-xs)var(--ui-space-xxl)var(--ui-space-xs)var(--ui-space-sm);font-family:var(--ui-font-family-body);font-size:var(--ui-font-size-14);line-height:var(--ui-line-height-20);color:var(--ui-color-text-default);background-color:var(--ui-color-neutral-white);border:var(--ui-stroke-1)solid var(--ui-color-neutral-grey-400);border-radius:var(--ui-radius-xl);outline:none;width:100%;transition:border-color .2s}.practice-lesson-selection-dialog__search-input::placeholder{color:var(--ui-color-neutral-grey-500)}.practice-lesson-selection-dialog__search-input:focus{border-color:var(--ui-color-brand-fod-primary-a)}.practice-lesson-selection-dialog__search-icon{top:50%;right:var(--ui-space-lg);color:var(--ui-color-neutral-grey-500);cursor:pointer;background-color:transparent;border:none;justify-content:center;align-items:center;padding:0;display:inline-flex;position:absolute;transform:translateY(-50%)}.practice-lesson-selection-dialog__tree{max-height:var(--practice-lesson-selection-dialog-tree-max-height);margin:0;padding:0;list-style:none;overflow-y:auto}.practice-lesson-selection-dialog__unit{border-bottom:var(--ui-stroke-1)solid var(--ui-color-neutral-grey-300)}.practice-lesson-selection-dialog__unit:last-child{border-bottom:none}.practice-lesson-selection-dialog__unit-row{align-items:center;gap:var(--ui-space-sm);padding:var(--ui-space-xs)var(--ui-space-md);display:flex}.practice-lesson-selection-dialog__unit-main{justify-content:space-between;align-items:center;gap:var(--ui-space-md);text-align:left;cursor:pointer;background-color:transparent;border:none;flex:1;min-width:0;padding:0;display:flex}.practice-lesson-selection-dialog__unit-info{gap:var(--ui-space-xxs);flex-direction:column;min-width:0;display:flex}.practice-lesson-selection-dialog__unit-name{font-family:var(--ui-font-family-body);font-weight:var(--ui-font-weight-bold);font-size:var(--ui-font-size-16);line-height:var(--ui-line-height-24);color:var(--ui-color-text-default);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.practice-lesson-selection-dialog__unit-counter{font-family:var(--ui-font-family-body);font-weight:var(--ui-font-weight-bold);font-size:var(--ui-font-size-14);line-height:var(--ui-line-height-20);color:var(--ui-color-neutral-grey-500);text-transform:uppercase}.practice-lesson-selection-dialog__unit-aside{align-items:center;gap:var(--ui-space-xxs);flex-shrink:0;display:inline-flex}.practice-lesson-selection-dialog__chevron{color:var(--ui-color-neutral-grey-600);align-items:center;display:inline-flex}.practice-lesson-selection-dialog__lessons{flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.practice-lesson-selection-dialog__lesson{align-items:center;gap:var(--ui-space-xs);padding:var(--ui-space-xs);padding-left:var(--practice-lesson-selection-dialog-lesson-indent);border-radius:var(--ui-radius-md-lg);cursor:pointer;display:flex}.practice-lesson-selection-dialog__lesson:hover{background-color:var(--ui-color-neutral-grey-100)}.practice-lesson-selection-dialog__lesson-name{font-family:var(--ui-font-family-body);font-size:var(--ui-font-size-14);line-height:var(--ui-line-height-20);color:var(--ui-color-text-default);text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;overflow:hidden}.practice-lesson-selection-dialog__lesson-aside{flex-shrink:0;align-items:center;display:inline-flex}.practice-lesson-selection-dialog__checkbox{width:var(--practice-lesson-selection-dialog-checkbox-size);height:var(--practice-lesson-selection-dialog-checkbox-size);color:var(--ui-color-neutral-white);background-color:var(--ui-color-neutral-white);border:var(--ui-stroke-2)solid var(--ui-color-neutral-grey-400);border-radius:var(--ui-radius-md-lg);cursor:pointer;flex-shrink:0;justify-content:center;align-items:center;padding:0;display:inline-flex}.practice-lesson-selection-dialog__checkbox--checked,.practice-lesson-selection-dialog__checkbox--indeterminate{background-color:var(--ui-color-brand-fod-primary-a);border-color:var(--ui-color-brand-fod-primary-a)}.practice-lesson-selection-dialog__checkbox-dash{height:var(--ui-stroke-2);background-color:var(--ui-color-neutral-white);border-radius:var(--ui-radius-sm);width:.625rem}.practice-lesson-selection-dialog__actions{justify-content:flex-end;align-items:center;gap:var(--ui-space-md);padding:var(--ui-space-sm)var(--ui-space-md);background-color:var(--ui-color-neutral-grey-100);border-top:var(--ui-stroke-1)solid var(--ui-color-neutral-grey-300);display:flex}.practice-lesson-selection-dialog__actions .button{flex:none;width:auto;min-width:0}.practice-lesson-selection-dialog__actions .button:disabled{opacity:.5;background-color:transparent}.practice-lesson-selection-dialog__actions .button--color-primary-outlined{background-color:var(--ui-color-neutral-white);padding-top:0!important;padding-bottom:0!important}.practice-lesson-selection-dialog__state{padding:var(--ui-space-lg);font-family:var(--ui-font-family-body);font-size:var(--ui-font-size-16);line-height:var(--ui-line-height-24);color:var(--ui-color-text-secondary);text-align:center;justify-content:center;align-items:center;display:flex}.practice-lesson-selection-dialog__warning{align-items:center;gap:var(--ui-space-xs);padding:var(--ui-space-md)var(--ui-space-xs);background-color:var(--ui-color-blue-100);border:var(--ui-stroke-1)solid var(--ui-color-blue-300);border-radius:var(--ui-radius-xl);display:flex}.practice-lesson-selection-dialog__warning-mascot{width:var(--practice-lesson-selection-dialog-mascot-size);height:var(--practice-lesson-selection-dialog-mascot-size);background-image:var(--tangerine-ai-bot-help);background-position:50%;background-repeat:no-repeat;background-size:contain;flex-shrink:0}.practice-lesson-selection-dialog__warning-text{font-family:var(--ui-font-family-body);font-size:var(--ui-font-size-16);line-height:var(--ui-line-height-24);color:var(--ui-color-neutral-grey-900)}.practice-lesson-selection-dialog__footer-count{font-family:var(--ui-font-family-body);font-weight:var(--ui-font-weight-bold);font-size:var(--ui-font-size-16);line-height:var(--ui-line-height-26);color:var(--ui-color-text-default)}.practice-status-chip{align-items:center;gap:var(--ui-space-xs);padding:var(--ui-space-xxs)var(--ui-space-sm);font-family:var(--ui-font-family-body);font-weight:var(--ui-font-weight-bold);font-size:var(--ui-font-size-14);line-height:var(--ui-line-height-20);white-space:nowrap;border-radius:var(--ui-radius-xxl);flex-shrink:0;display:inline-flex}.practice-status-chip__emoji{font-size:var(--ui-font-size-20);line-height:1}.practice-status-chip--mastered{color:var(--ui-color-green-800);background-color:var(--ui-color-green-200)}.practice-status-chip--in-progress{color:var(--ui-color-blue-800);background-color:var(--ui-color-blue-200)}.practice-status-chip--not-started{color:var(--ui-color-neutral-grey-800);background-color:var(--ui-color-neutral-grey-200)}.practice-status-chip--blocked{color:var(--ui-color-red-800);background-color:var(--ui-color-red-200)}