.lt-app-header{box-sizing:border-box;background:0 0;flex-flow:row;justify-content:space-between;align-items:center;gap:12px;width:100%;display:flex}.lt-app-header:not(.lt-app-header--task){max-width:var(--page-max-width,420px);margin-inline-start:auto;margin-inline-end:auto}.lt-app-header--task{width:100%;max-width:none;padding:10px var(--page-padding-inline,var(--spacing-md)) 0;margin-inline-start:0;margin-inline-end:0;--lf-task-header-title:color-mix(in srgb, color-mix(in srgb, var(--palette-solution-label-light) 65%, var(--palette-logo-purple) 35%) 88%, var(--palette-neutral-950) 12%);--lf-task-header-slogan:var(--lf-task-header-title);flex-flow:row;margin-bottom:8px;display:flex}html.dark .lt-app-header--task{--lf-task-header-title:var(--palette-solution-500);--lf-task-header-slogan:var(--lf-task-header-title)}.lt-app-header--compact:not(.lt-app-header--task){margin-bottom:8px;padding:10px 16px 0}.lt-app-header:not(.lt-app-header--compact):not(.lt-app-header--task){margin-bottom:20px;padding:20px 20px 0}.lt-app-header--sticky{z-index:10;position:sticky;top:0}.lt-app-header--menu-only{justify-content:flex-end}.lt-app-header__brand{flex:auto;align-items:center;gap:12px;min-width:0;display:flex}.lt-app-header__text{text-align:left;overflow-wrap:normal;word-break:normal;flex:auto;min-width:0}.lt-app-header__title,.lt-app-header__slogan{margin:0;font-family:inherit;font-size:15px;font-weight:600;line-height:1.2}.lt-app-header__slogan{white-space:nowrap;margin-top:4px}.lt-app-header__title--gradient,.lt-app-header__slogan--gradient{color:#0000;-webkit-text-fill-color:transparent;background-image:linear-gradient(90deg,#1d4ed8 0%,#7c3aed 52%,#3b0764 100%);-webkit-background-clip:text;background-clip:text}.lt-app-header--task .lt-app-header__title,.lt-app-header--task .lt-app-header__slogan{color:var(--lf-task-header-title)!important;-webkit-text-fill-color:var(--lf-task-header-title)!important;background-image:none!important;-webkit-background-clip:border-box!important;background-clip:border-box!important}.lt-app-header--task .lt-header-menu{flex-shrink:0;margin-inline-start:auto}.lt-header-menu--tangerine-v4{flex-shrink:0}.lt-header-menu--tangerine-v4 .lt-header-menu__chrome{align-items:center;gap:8px;display:flex}.lt-header-menu--tangerine-v4 .lt-header-menu__icon-btn{width:44px;height:44px;color:var(--color-text-secondary,var(--lt-toggle-icon));cursor:pointer;background:0 0;border:none;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;margin:0;padding:0;display:flex}.lt-header-menu--tangerine-v4 .lt-header-menu__icon-btn:focus-visible{outline:2px solid var(--color-border-focus,var(--lt-green-border));outline-offset:3px}.lt-header-menu--tangerine-v4 .lt-header-menu__theme-glyph{font-size:22px;line-height:1;transform:translate(-8px,-3px)}.lt-header-menu--tangerine-v4 .lt-header-menu__menu-glyph{transform:translateY(-1px)}.lt-header-menu--tangerine-v4 .lt-header-menu__dropdown{z-index:100;box-sizing:border-box;border-radius:var(--radius-md,18px);border:1px solid var(--color-border-strong,var(--lt-border));background:var(--color-background,var(--lt-page-bg));width:min(92vw,280px);min-width:220px;max-width:min(92vw,280px);box-shadow:var(--shadow-elevated,0 10px 28px #00000024);padding:0;position:absolute;top:calc(100% + 8px);right:0;overflow:hidden}html.dark .lt-header-menu--tangerine-v4 .lt-header-menu__dropdown{background:var(--color-background,var(--lt-page-bg))}.lt-header-menu--tangerine-v4 .lt-header-menu__banner{padding:var(--spacing-md,12px);background:var(--color-cta-bg,linear-gradient(180deg, #f0a05a 0%, #e0853c 52%, #cc7430 100%));color:var(--color-text-on-primary,#f8fafc)}.lt-header-menu--tangerine-v4 .lt-header-menu__greeting{color:inherit;overflow-wrap:break-word;word-break:normal;margin:0;font-size:15px;font-weight:600;line-height:1.35}.lt-header-menu--tangerine-v4 .lt-header-menu__greeting--wrap{white-space:normal}.lt-header-menu--tangerine-v4 .lt-header-menu__greeting--ellipsis{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.lt-header-menu--tangerine-v4 .lt-header-menu__list{padding:var(--spacing-sm,8px);gap:2px;display:grid}.lt-header-menu--tangerine-v4 .lt-header-menu__item{align-items:center;gap:var(--spacing-sm,8px);border-radius:var(--radius-sm,12px);width:100%;min-width:0;min-height:44px;color:var(--color-text-primary,var(--lt-text-primary));font:inherit;text-align:left;cursor:pointer;overflow-wrap:break-word;word-break:normal;background:0 0;border:none;margin:0;padding:8px 12px;font-size:14px;font-weight:600;display:flex}.lt-header-menu--tangerine-v4 .lt-header-menu__item:hover{background:var(--color-primary-soft,#e0853c29);outline:none}.lt-header-menu--tangerine-v4 .lt-header-menu__item:focus-visible{background:var(--color-primary-soft,#e0853c29);outline:none}html.dark .lt-header-menu--tangerine-v4 .lt-header-menu__item:hover{background:var(--color-primary-soft,#f09a522e)}html.dark .lt-header-menu--tangerine-v4 .lt-header-menu__item:focus-visible{background:var(--color-primary-soft,#f09a522e)}.lt-header-menu--tangerine-v4 .lt-header-menu__item-icon{color:var(--color-text-muted,var(--lt-text-secondary));flex-shrink:0;display:inline-flex}.lt-header-menu--tangerine-v4 .lt-header-menu__item-label{overflow-wrap:break-word;min-width:0}.lt-header-menu--tangerine-v4 .lt-header-menu__item--danger{color:var(--color-error,var(--lt-error))}.lt-header-menu--tangerine-v4 .lt-header-menu__sep{background:var(--color-divider,var(--lt-border));height:1px;margin:8px 4px}:root{--palette-primary-300:#f0a05a;--palette-primary-400:#f09a52;--palette-primary-500:#e0853c;--palette-primary-600:#cc7430;--palette-primary-soft-light:#e0853c29;--palette-primary-soft-dark:#f09a522e;--palette-neutral-950:#28262a;--palette-neutral-900:#36363a;--palette-neutral-800:#343238;--palette-neutral-700:#5e5e66;--palette-neutral-600:#7a7a84;--palette-neutral-500:#8e8e98;--palette-neutral-400:#b0b0b8;--palette-neutral-200:#ececef;--palette-neutral-100:#f8f5f1;--palette-neutral-50:#f3eee8;--palette-neutral-25:#fbf9f6;--palette-task-blue-200:#b8d4e8;--palette-task-blue-400:#6eabcc;--palette-task-blue-500:#5a9ec0;--palette-task-label-light:#5a7e94;--palette-task-label-dark:#8eafc4;--palette-hint-blue-200:#a8cce4;--palette-hint-blue-400:#6aa3c4;--palette-solution-200:#e4daf2;--palette-solution-300:#eee6f8;--palette-solution-500:#9a7ec4;--palette-solution-label-light:#654a96;--palette-solution-label-dark:#c8b0e8;--palette-answer-200:#f7eee4;--palette-answer-500:#d4a06a;--palette-answer-dark-bg:#3a342e;--palette-success-text-light:#6e4a28;--palette-success-text-dark:#f0d4b0;--palette-logo-purple:#7030d0;--palette-error-border-unconfirmed:#b33a2b;--palette-error-bg-unconfirmed:#f3e4e1;--palette-error-text-unconfirmed:#7a2a20;--palette-info-border-unconfirmed:#4a5a70;--palette-info-bg-unconfirmed:#e6eaf0;--palette-info-text-unconfirmed:#334056;--color-primary:var(--palette-primary-500);--color-primary-hover:var(--palette-primary-600);--color-primary-active:var(--color-primary-hover);--color-primary-disabled:color-mix(in srgb, var(--color-primary) 40%, var(--palette-neutral-600) 60%);--color-primary-soft:var(--palette-primary-soft-light);--color-on-primary:#f8fafc;--color-cta-bg:linear-gradient(180deg, var(--palette-primary-300) 0%, var(--palette-primary-500) 52%, var(--palette-primary-600) 100%);--color-background:var(--palette-neutral-50);--color-background-image:radial-gradient(ellipse 90% 55% at 50% -10%, #e8924a1c, transparent 58%), linear-gradient(180deg, #f7f3ee 0%, var(--palette-neutral-50) 100%);--color-surface:var(--palette-neutral-100);--color-surface-secondary:var(--palette-neutral-100);--color-surface-elevated:var(--palette-neutral-25);--color-text-primary:var(--palette-neutral-900);--color-text-secondary:var(--palette-neutral-700);--color-text-muted:var(--palette-neutral-600);--color-text-disabled:color-mix(in srgb, var(--color-text-muted) 65%, transparent);--color-text-inverse:var(--palette-neutral-200);--color-text-on-primary:var(--color-on-primary);--color-link:var(--color-primary);--color-border:#36363a17;--color-border-strong:#36363a24;--color-border-focus:var(--color-primary);--color-divider:var(--color-border);--color-task-background:linear-gradient(180deg, color-mix(in srgb, var(--palette-task-blue-200) 18%, var(--color-surface)) 0%, color-mix(in srgb, var(--palette-task-blue-200) 12%, var(--color-surface)) 100%);--color-task-border:color-mix(in srgb, var(--palette-task-blue-400) 42%, #c8d4dc);--color-task-label:var(--palette-task-label-light);--color-hint:var(--palette-task-label-light);--color-on-hint:var(--color-text-primary);--color-hint-background:linear-gradient(180deg, color-mix(in srgb, var(--palette-hint-blue-200) 14%, var(--color-surface)) 0%, color-mix(in srgb, var(--palette-hint-blue-200) 9%, var(--color-surface)) 100%);--color-hint-border:color-mix(in srgb, var(--palette-hint-blue-400) 38%, #c8d4dc);--color-hint-btn-background:color-mix(in srgb, var(--palette-task-blue-200) 10%, var(--color-surface) 90%);--color-hint-btn-border:var(--color-hint-border);--color-solution:var(--palette-solution-label-light);--color-solution-background:linear-gradient(180deg, var(--palette-solution-300) 0%, var(--palette-solution-200) 100%);--color-solution-border:var(--palette-solution-500);--color-solution-btn-background:color-mix(in srgb, var(--palette-solution-200) 88%, var(--color-surface) 12%);--color-solution-btn-border:var(--palette-solution-500);--color-reasoning-step-background:linear-gradient(180deg, color-mix(in srgb, var(--palette-solution-300) 42%, var(--color-surface) 58%) 0%, color-mix(in srgb, var(--palette-solution-200) 36%, var(--color-surface) 64%) 100%);--color-reasoning-step-border:color-mix(in srgb, var(--palette-solution-500) 48%, var(--color-border) 52%);--color-reasoning-feedback-ok:var(--color-primary);--color-reasoning-feedback-bad:color-mix(in srgb, color-mix(in srgb, var(--palette-solution-label-light) 65%, var(--palette-logo-purple) 35%) 88%, var(--palette-neutral-950) 12%);--color-reasoning-step-foreground:var(--color-text-primary);--color-reasoning-option:var(--color-text-primary);--color-answer:var(--palette-answer-500);--color-on-answer:var(--color-text-primary);--color-answer-background:var(--palette-answer-200);--color-answer-border:var(--palette-answer-500);--color-answer-focus:color-mix(in srgb, var(--palette-primary-500) 26%, transparent);--color-ai-check:var(--color-info);--color-ai-check-background:var(--color-info-background);--color-ai-check-border:var(--color-info-border);--color-result-correct:var(--palette-success-text-light);--color-result-correct-background:linear-gradient(180deg, #f6eee4 0%, #f0e6d8 100%);--color-result-correct-border:var(--palette-answer-500);--color-success:var(--color-result-correct);--color-success-background:var(--color-result-correct-background);--color-success-border:var(--color-result-correct-border);--color-success-text:var(--palette-success-text-light);--color-result-wrong:var(--palette-error-text-unconfirmed);--color-result-wrong-background:var(--palette-error-bg-unconfirmed);--color-result-wrong-border:var(--palette-error-border-unconfirmed);--color-error:var(--palette-error-text-unconfirmed);--color-error-background:var(--palette-error-bg-unconfirmed);--color-error-border:var(--palette-error-border-unconfirmed);--color-error-text:var(--palette-error-text-unconfirmed);--color-info:var(--palette-info-text-unconfirmed);--color-info-background:var(--palette-info-bg-unconfirmed);--color-info-border:var(--palette-info-border-unconfirmed);--color-info-text:var(--palette-info-text-unconfirmed);--color-logo-brand:var(--palette-logo-purple);--color-overlay:color-mix(in srgb, var(--palette-neutral-950) 48%, transparent);--color-task-free:var(--color-text-secondary);--color-task-free-background:var(--color-surface-secondary);--color-task-free-border:var(--color-border-strong);--color-on-task-free:var(--color-text-primary);--color-task-easy:var(--palette-task-blue-500);--color-task-easy-background:color-mix(in srgb, var(--palette-task-blue-200) 22%, var(--color-surface));--color-task-easy-border:color-mix(in srgb, var(--palette-task-blue-400) 50%, #c8d4dc);--color-on-task-easy:var(--color-text-primary);--color-task-medium:var(--palette-primary-500);--color-task-medium-background:color-mix(in srgb, var(--palette-primary-soft-light) 55%, var(--color-surface));--color-task-medium-border:color-mix(in srgb, var(--palette-primary-400) 45%, #dcc8b4);--color-on-task-medium:var(--color-text-primary);--color-task-hard:var(--palette-primary-600);--color-task-hard-background:color-mix(in srgb, var(--palette-primary-500) 14%, var(--color-surface));--color-task-hard-border:color-mix(in srgb, var(--palette-primary-500) 55%, #c4a882);--color-on-task-hard:var(--color-text-primary);--color-task-status-open:var(--color-text-secondary);--color-task-status-open-background:var(--color-surface-secondary);--color-task-status-in-progress:var(--color-info);--color-task-status-in-progress-background:var(--color-info-background);--color-task-status-solved:var(--color-result-correct);--color-task-status-solved-background:var(--color-result-correct-background);--color-task-status-wrong:var(--color-result-wrong);--color-task-status-wrong-background:var(--color-result-wrong-background);--color-task-status-skipped:var(--color-text-muted);--color-task-status-skipped-background:var(--color-surface-secondary);--color-task-status-revealed:var(--color-solution);--color-task-status-revealed-background:var(--color-solution-background);--color-task-status-locked:var(--color-text-muted);--color-task-status-locked-background:var(--color-surface-secondary);--color-progress-fill:var(--color-primary);--color-progress-track:var(--color-border-strong);--font-family-primary:"Plus Jakarta Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-family-secondary:var(--font-family-primary);--font-family-monospace:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--font-size-xs:.6875rem;--font-size-sm:.8125rem;--font-size-md:.9375rem;--font-size-lg:1.125rem;--font-size-xl:clamp(1.4rem, 4.6vw, 1.65rem);--font-size-2xl:clamp(1.5rem, 5vw, 1.75rem);--font-size-page-title:var(--font-size-xl);--font-size-section-title:var(--font-size-lg);--font-size-card-title:var(--font-size-lg);--font-size-body:var(--font-size-md);--font-size-secondary:var(--font-size-sm);--font-size-caption:var(--font-size-sm);--font-size-button:var(--font-size-md);--font-size-input:1rem;--font-size-label:.75rem;--font-weight-regular:400;--font-weight-medium:500;--font-weight-semibold:600;--font-weight-bold:700;--font-weight-page-title:var(--font-weight-semibold);--font-weight-section-title:var(--font-weight-bold);--font-weight-card-title:var(--font-weight-bold);--font-weight-body:var(--font-weight-regular);--font-weight-secondary:var(--font-weight-regular);--font-weight-caption:var(--font-weight-semibold);--font-weight-button:var(--font-weight-semibold);--font-weight-label:var(--font-weight-bold);--line-height-tight:1.32;--line-height-normal:1.45;--line-height-relaxed:1.6;--line-height-page-title:var(--line-height-tight);--line-height-section-title:var(--line-height-tight);--line-height-card-title:var(--line-height-tight);--line-height-body:var(--line-height-relaxed);--line-height-secondary:var(--line-height-normal);--line-height-caption:var(--line-height-normal);--letter-spacing-tight:-.02em;--letter-spacing-normal:0;--letter-spacing-wide:.04em;--title-font-size:var(--font-size-page-title);--body-font-size:var(--font-size-body);--caption-font-size:var(--font-size-caption);--spacing-0:0;--spacing-2xs:4px;--spacing-xs:6px;--spacing-sm:12px;--spacing-md:18px;--spacing-lg:28px;--spacing-xl:40px;--spacing-2xl:56px;--page-padding-inline:var(--spacing-md);--page-padding-inline-compact:var(--spacing-sm);--page-padding-block:var(--spacing-lg);--card-padding:var(--spacing-md);--section-gap:var(--spacing-md);--form-field-gap:var(--spacing-xs);--button-group-gap:var(--spacing-sm);--page-min-width:320px;--page-max-width:420px;--content-min-height:100dvh;--header-height:auto;--bottom-action-height:auto;--button-height-lg:48px;--button-height-md:44px;--button-height-sm:40px;--control-height-lg:var(--button-height-lg);--control-height-md:var(--button-height-md);--control-height-sm:var(--button-height-sm);--input-height:var(--button-height-md);--textarea-min-height:96px;--icon-size-sm:16px;--icon-size-md:22px;--icon-size-lg:28px;--touch-target-min:40px;--logo-size-welcome:140px;--logo-size-header:54px;--safe-area-top:env(safe-area-inset-top,0px);--safe-area-right:env(safe-area-inset-right,0px);--safe-area-bottom:env(safe-area-inset-bottom,0px);--safe-area-left:env(safe-area-inset-left,0px);--breakpoint-mobile-compact:359px;--breakpoint-mobile-regular:360px;--breakpoint-mobile-wide:430px;--radius-none:0;--radius-xs:4px;--radius-sm:12px;--radius-md:18px;--radius-lg:26px;--radius-xl:28px;--radius-pill:9999px;--radius-round:50%;--radius-button:var(--radius-pill);--radius-card:var(--radius-lg);--radius-input:var(--radius-md);--radius-modal:var(--radius-lg);--radius-badge:var(--radius-pill);--shadow-none:none;--shadow-sm:0 1px 6px #36363a0d;--shadow-card:0 8px 24px #36363a0f;--shadow-elevated:var(--shadow-card);--shadow-btn:0 6px 18px #e0853c42;--shadow-modal:var(--shadow-card);--shadow-focus:0 0 0 3px var(--color-answer-focus);--shadow-logo:drop-shadow(0 8px 20px #0000001f);--border-width-thin:1px;--border-width-medium:3px;--border-style-default:solid;--border-color-default:var(--color-border);--border-color-strong:var(--color-border-strong);--border-color-focus:var(--color-border-focus);--border-default:var(--border-width-thin) var(--border-style-default) var(--border-color-default);--border-focus:var(--border-width-thin) var(--border-style-default) var(--border-color-focus);--border-error:var(--border-width-medium) var(--border-style-default) var(--color-error-border);--border-card-entity:var(--border-width-medium) var(--border-style-default);--duration-fast:.16s;--duration-normal:.28s;--duration-slow:.44s;--easing-standard:cubic-bezier(.4, 0, .2, 1);--easing-emphasized:cubic-bezier(.22, 1, .36, 1);--transition-color:color var(--duration-normal) var(--easing-standard), background var(--duration-normal) var(--easing-standard), border-color var(--duration-normal) var(--easing-standard);--transition-transform:transform var(--duration-normal) var(--easing-standard);--transition-shadow:box-shadow var(--duration-normal) var(--easing-standard);--transition-ui:var(--duration-normal) var(--easing-standard);--transition-page:var(--duration-slow) var(--easing-emphasized);--opacity-disabled:.48;--z-base:0;--z-sticky:10;--z-header:20;--z-dropdown:30;--z-overlay:40;--z-modal:50;--z-toast:60;--primary-color:var(--color-primary);--bg-color:var(--color-background);--text-color:var(--color-text-primary);--surface-color:var(--color-surface);--border-color:var(--color-border)}html.dark{--color-primary:var(--palette-primary-400);--color-primary-hover:#f5a866;--color-primary-active:var(--color-primary-hover);--color-primary-soft:var(--palette-primary-soft-dark);--color-cta-bg:linear-gradient(180deg, #f5a866 0%, var(--palette-primary-400) 48%, var(--palette-primary-500) 100%);--color-background:var(--palette-neutral-950);--color-background-image:radial-gradient(ellipse 100% 60% at 50% -12%, color-mix(in srgb, var(--palette-primary-500) 12%, transparent), transparent 55%), linear-gradient(185deg, #302e32 0%, var(--palette-neutral-950) 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100%}.lf-account-tasks__favorite{color:var(--color-primary);flex-shrink:0;display:inline-flex}.lf-account-tasks__badge{align-items:center;gap:var(--spacing-2xs);color:var(--color-task-status-solved);font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);flex-shrink:0;display:inline-flex}.lf-account-tasks__badge--locked{color:var(--color-text-muted);font-weight:var(--font-weight-semibold)}.lf-account-tasks__badge-text{white-space:nowrap}.lf-account-tasks__empty{color:var(--color-text-secondary);font-size:var(--font-size-body);text-align:center;align-self:center;margin:0}.lf-account-tasks__actions{gap:var(--spacing-sm);flex-direction:column;flex-shrink:0;width:100%;min-width:0;display:flex}.lf-account-tasks__actions .lf-btn{min-height:max(var(--button-height-md), var(--touch-target-min))}.lf-account-page__install.lf-btn{background:color-mix(in srgb, var(--palette-primary-300) 26%, var(--color-surface) 74%);border-color:color-mix(in srgb, var(--color-primary) 70%, 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