.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;block-size:1px;inline-size:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.learn-app-hd{z-index:80;background:var(--bg-card);border-bottom:1px solid var(--line);position:sticky;top:0}.learn-app-hd__inner{justify-content:space-between;align-items:center;gap:calc(var(--lz-space-4) + var(--lz-space-1));min-height:64px;max-width:var(--content-max,1180px);padding-inline:clamp(var(--lz-space-4), 2.4vw, var(--lz-space-6));margin-inline:auto;display:flex}.learn-app-hd a{text-decoration:none}.learn-app-hd :is(a,button):focus-visible,.learn-app-tabbar :is(a,button):focus-visible,.learn-app-sheet :is(a,button):focus-visible{outline:3px solid var(--learn-app-focus);outline-offset:2px}.learn-app-hd__brand{align-items:center;gap:var(--lz-space-2);min-height:44px;color:var(--text);font-size:var(--fs-lead);flex:none;font-weight:800;display:inline-flex}.learn-app-hd__brand img{block-size:24px;inline-size:24px}.learn-app-hd__nav{align-items:center;gap:var(--lz-space-1);display:flex}.learn-app-hd__link{justify-content:center;align-items:center;gap:var(--lz-space-2);min-height:44px;padding:0 var(--lz-space-3);color:var(--text-muted);font:inherit;font-size:var(--fs-small);white-space:nowrap;cursor:pointer;background:0 0;border:1px solid #0000;border-radius:12px;font-weight:600;transition:background-color .16s,color .16s,border-color .16s;display:inline-flex;position:relative}.learn-app-hd__link:hover{color:var(--text)}.learn-app-hd__link.is-active{border-color:var(--line);background:var(--bg-raised);color:var(--text)}.learn-app-hd__chev{opacity:.7;transition:transform var(--dur) var(--ease)}[aria-expanded=true]>.learn-app-hd__chev{transform:rotate(180deg)}.learn-app-hd__badge{block-size:18px;min-inline-size:18px;padding:0 var(--lz-space-1);background:var(--learn-app-action);color:var(--learn-app-action-text);font-size:var(--fs-caption);border-radius:999px;place-items:center;font-weight:700;line-height:1;display:inline-grid}.learn-app-hd__dd{position:relative}@keyframes learn-app-hd-in{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}.learn-app-hd__menu{z-index:200;width:264px;max-width:min(264px,100vw - 24px);padding:var(--lz-space-2);border:1px solid var(--line);background:var(--bg-card);color:var(--text);box-shadow:0 16px 40px color-mix(in srgb, var(--text) 12%, transparent);animation:learn-app-hd-in var(--dur) var(--ease);border-radius:16px;position:absolute;top:calc(100% + 8px);left:0}.learn-app-hd__menu--end{left:auto;right:0}.learn-app-hd__mi{align-items:center;gap:var(--lz-space-2);width:100%;min-height:44px;padding:var(--lz-space-2) var(--lz-space-3);color:var(--text);font:inherit;font-size:var(--fs-small);text-align:start;cursor:pointer;background:0 0;border:1px solid #0000;border-radius:10px;grid-template-columns:16px minmax(0,1fr) auto;display:grid}.learn-app-hd__mi--plain{grid-template-columns:16px minmax(0,1fr)}.learn-app-hd__mi:hover,.learn-app-hd__mi:focus-visible,.learn-app-hd__mi.is-active{border-color:var(--line);background:var(--bg-raised)}.learn-app-hd__mi-hint{color:var(--text-muted);font-size:var(--fs-caption);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.learn-app-hd__mi--danger{color:var(--err-ink)!important}.learn-app-hd__sep{block-size:1px;margin:var(--lz-space-1) var(--lz-space-1);background:color-mix(in srgb, var(--text) 8%, transparent)}.learn-app-hd__who{gap:var(--lz-space-1);padding:var(--lz-space-1) var(--lz-space-3) var(--lz-space-2);display:grid}.learn-app-hd__who strong{font-size:var(--fs-small)}.learn-app-hd__who span{color:var(--text-muted);font-size:var(--fs-caption)}.learn-app-hd__nav-icon{flex:none;justify-content:center;align-items:center;block-size:20px;inline-size:18px;display:inline-flex;position:relative}.learn-app-hd__guest-actions{align-items:center;gap:var(--lz-space-2);display:flex}.learn-app-hd__register{min-block-size:44px;padding-inline:var(--lz-space-3);border:1px solid var(--learn-app-action);background:var(--learn-app-action);color:var(--learn-app-action-text);font-size:var(--fs-caption);white-space:nowrap;border-radius:10px;justify-content:center;align-items:center;font-weight:700;text-decoration:none;display:inline-flex}.learn-app-hd__register:hover{background:var(--learn-app-action-hover);border-color:var(--learn-app-action-hover)}.learn-app-hd__guest-actions .learn-app-hd__login{min-block-size:44px}.learn-app-hd__session-alert{justify-content:center;align-items:center;gap:var(--lz-space-2) var(--lz-space-3);padding:var(--lz-space-2) var(--lz-space-4);border-bottom:1px solid var(--err);background:color-mix(in srgb, var(--err) 9%, var(--bg-card));color:var(--text);font-size:var(--fs-small);flex-wrap:wrap;display:flex}.learn-app-hd__session-alert button{min-block-size:44px;padding:var(--lz-space-1) var(--lz-space-3);border:1px solid var(--control-border);background:var(--bg-card);color:var(--text);font:inherit;border-radius:8px;font-weight:700}.learn-app-hd__right{align-items:center;gap:var(--lz-space-3);flex:none;display:flex;position:relative}.learn-app-hd__right .learn-app-ui-theme-error{z-index:100;width:min(18rem,100vw - 2rem);padding:var(--lz-space-2) var(--lz-space-2);border:1px solid var(--line);background:var(--bg-card);color:var(--text);font-size:var(--fs-caption);box-shadow:0 8px 24px color-mix(in srgb, var(--text) 12%, transparent);border-radius:12px;line-height:1.4;position:absolute;inset-block-start:calc(100% + 4px);inset-inline-end:0}.learn-app-hd__streak{align-items:center;gap:var(--lz-space-1);color:var(--gold-ink);font-size:var(--fs-small);font-weight:700;display:inline-flex}.learn-app-hd__xp{min-height:44px;padding:0 var(--lz-space-3);border:1px solid var(--line);background:var(--bg-card);color:var(--text-muted);font-size:var(--fs-caption);white-space:nowrap;border-radius:999px;align-items:center;font-weight:600;display:inline-flex}.learn-app-hd__xp:hover{color:var(--text)}.learn-app-hd__xp.is-skeleton{pointer-events:none;justify-content:center;min-inline-size:7.5rem}.learn-app-hd__xp-skel{background:linear-gradient(90deg, color-mix(in srgb, var(--text) 8%, transparent) 0%, color-mix(in srgb, var(--text) 18%, transparent) 50%, color-mix(in srgb, var(--text) 8%, transparent) 100%);background-size:200% 100%;border-radius:999px;block-size:.7rem;inline-size:5.5rem;animation:1.1s ease-in-out infinite learn-app-hd-skel;display:inline-block}@keyframes learn-app-hd-skel{0%{background-position:100% 0}to{background-position:-100% 0}}@media (prefers-reduced-motion:reduce){.learn-app-hd__menu,.learn-app-sheet,.learn-app-sheet__scrim,.learn-app-hd__link,.learn-app-hd__login{transition:none;animation:none}.learn-app-hd__xp-skel{animation:none}}.learn-app-hd__login{min-height:44px;padding:0 var(--lz-space-4);border:1px solid var(--control-border);font-size:var(--fs-small);background:0 0;border-radius:12px;justify-content:center;align-items:center;font-weight:750;transition:background-color .16s,border-color .16s;display:inline-flex;color:var(--text)!important}.learn-app-hd__login:hover{border-color:var(--line-strong);background:var(--bg-raised)}.learn-app-hd__auth-slot{inline-size:72px}.learn-app-hd__avatar-btn{align-items:center;gap:var(--lz-space-1);min-height:44px;padding:var(--lz-space-1) var(--lz-space-2) var(--lz-space-1) var(--lz-space-1);border:1px solid var(--line);background:var(--bg-card);color:var(--text-muted);cursor:pointer;border-radius:999px;display:inline-flex}.learn-app-hd__avatar-btn:hover{background:var(--bg-raised);color:var(--text)}.learn-app-hd__avatar{border:1px solid var(--line);background:var(--bg-raised);width:34px;height:34px;color:var(--text);font-size:var(--fs-caption);border-radius:50%;place-items:center;font-weight:750;display:inline-grid}.learn-app-tabbar,.learn-app-sheet,.learn-app-sheet__scrim{display:none}@media (width<=1119.98px){.learn-app-hd__inner{gap:var(--lz-space-2)}.learn-app-hd__nav{gap:var(--lz-space-1)}.learn-app-hd__link{min-block-size:44px;padding-inline:var(--lz-space-2);gap:var(--lz-space-1);font-size:var(--fs-caption)}.learn-app-hd__nav-icon{block-size:18px;inline-size:18px}.learn-app-hd__nav .learn-app-hd__badge{position:absolute;inset-block-start:-5px;inset-inline-end:-7px}.learn-app-hd__xp.is-member{display:none}}@media (width<=900px){.learn-app-hd__inner{block-size:64px;padding-inline:var(--lz-space-4)}.learn-app-hd__brand{gap:var(--lz-space-2);font-size:var(--fs-lead)}.learn-app-hd__nav,.learn-app-hd__xp{display:none!important}.learn-app-hd__right{gap:var(--lz-space-1)}.learn-app-hd__right .learn-app-theme-toggle{block-size:40px;inline-size:40px}.learn-app-hd__avatar-btn .learn-app-hd__chev{display:none}.learn-app-hd__avatar-btn,.learn-app-hd__login{min-block-size:44px}.learn-app-hd__login{block-size:44px;min-block-size:44px;padding-inline:var(--lz-space-3)}.learn-app-tabbar{inset-inline:0;z-index:90;block-size:calc(64px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--bg-card);border-top:1px solid var(--line);grid-template-columns:repeat(5,minmax(0,1fr));display:grid;position:fixed;bottom:0}.learn-app-tabbar__tab{justify-content:center;align-items:center;gap:var(--lz-space-1);min-block-size:48px;color:var(--text-muted);font:inherit;font-size:var(--fs-caption);cursor:pointer;background:0 0;border:0;flex-direction:column;font-weight:500;text-decoration:none;display:flex;position:relative}.learn-app-tabbar__tab.is-active{color:var(--text);background:var(--bg-raised)}.learn-app-tabbar__tab.is-active:before{content:"";background:var(--learn-app-action);border-radius:0 0 3px 3px;width:24px;height:3px;position:absolute;inset-block-start:0;inset-inline-start:50%;transform:translate(-50%)}.learn-app-tabbar__icon{display:inline-flex;position:relative}.learn-app-tabbar__badge{position:absolute;top:-6px;left:14px}.learn-app-sheet__scrim{z-index:94;background:var(--learn-app-backdrop);animation:learn-app-hd-fade var(--dur) var(--ease);border:0;display:block;position:fixed;inset:0}.learn-app-sheet{inset-inline:0;z-index:95;max-block-size:85vh;padding:var(--lz-space-2) var(--lz-space-3) calc(var(--lz-space-4) + env(safe-area-inset-bottom));border:1px solid var(--line);background:var(--bg-card);box-shadow:0 -16px 40px color-mix(in srgb, var(--text) 12%, transparent);color:var(--text);animation:learn-app-hd-up var(--dur) var(--ease);border-radius:20px 20px 0 0;display:block;position:fixed;bottom:0;overflow-y:auto}.learn-app-sheet__handle{block-size:4px;inline-size:32px;margin:var(--lz-space-1) auto var(--lz-space-3);background:color-mix(in srgb, var(--text) 25%, transparent);border-radius:999px}.learn-app-sheet__title{margin:var(--lz-space-3) var(--lz-space-3) var(--lz-space-1);color:var(--text-muted);font-size:var(--fs-caption);font-weight:500}.learn-app-sheet__item{align-items:center;gap:var(--lz-space-3);inline-size:100%;min-height:48px;padding:var(--lz-space-2) var(--lz-space-3);color:var(--text);font:inherit;font-size:var(--fs-body);text-align:start;cursor:pointer;background:0 0;border:1px solid #0000;border-radius:12px;text-decoration:none;display:flex}.learn-app-sheet__item small{color:var(--text-muted);font-size:var(--fs-caption);margin-inline-start:auto}.learn-app-sheet__item:hover,.learn-app-sheet__item.is-active{border-color:var(--line);background:var(--bg-raised)}.learn-app-shell-main{padding-block-end:calc(calc(var(--lz-space-7) + var(--lz-space-4)) + var(--lz-space-4) + env(safe-area-inset-bottom))!important}}@keyframes learn-app-hd-fade{0%{opacity:0}}@keyframes learn-app-hd-up{0%{opacity:0;transform:translateY(16px)}}.learn-app-hd__logout-warning{justify-content:space-between;align-items:center;gap:var(--lz-space-3);padding:var(--lz-space-2) var(--lz-space-5);color:var(--text);background:var(--bg-elev);border-block-end:var(--divider);font-size:var(--fs-small);display:flex}.learn-app-hd__logout-warning button{color:inherit;font:inherit;cursor:pointer;background:0 0;border:0;flex:none;text-decoration:underline}@media (width<=400px){.learn-app-hd__right,.learn-app-hd__guest-actions{gap:var(--lz-space-1)}.learn-app-hd__guest-actions .learn-app-hd__login,.learn-app-hd__register{min-inline-size:0;max-inline-size:80px;padding-inline:var(--lz-space-2);font-size:var(--fs-caption);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.learn-app-hd__register{max-inline-size:90px}.learn-app-hd__brand{font-size:var(--fs-body)}}@media (width<=540px){.learn-app-hd__logout-warning{padding-inline:var(--lz-space-4);align-items:flex-start}}@media (width<=767.98px){.learn-app-hd__register{display:none}}@media (prefers-reduced-motion:reduce){.learn-app-hd *,.learn-app-tabbar *{transition-duration:.01ms!important;animation-duration:.01ms!important}}@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){:root,:host{--shimmer-angle:20deg}*,:before,:after,::backdrop{--tw-translate-x:0;--tw-translate-y:0;--tw-translate-z:0;--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-space-y-reverse:0;--tw-border-style:solid;--tw-leading:initial;--tw-font-weight:initial;--tw-tracking:initial;--tw-ordinal:initial;--tw-slashed-zero:initial;--tw-numeric-figure:initial;--tw-numeric-spacing:initial;--tw-numeric-fraction:initial;--tw-shadow:0 0 #0000;--tw-shadow-color:initial;--tw-shadow-alpha:100%;--tw-inset-shadow:0 0 #0000;--tw-inset-shadow-color:initial;--tw-inset-shadow-alpha:100%;--tw-ring-color:initial;--tw-ring-shadow:0 0 #0000;--tw-inset-ring-color:initial;--tw-inset-ring-shadow:0 0 #0000;--tw-ring-inset:initial;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-offset-shadow:0 0 #0000;--tw-outline-style:solid;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial;--tw-backdrop-blur:initial;--tw-backdrop-brightness:initial;--tw-backdrop-contrast:initial;--tw-backdrop-grayscale:initial;--tw-backdrop-hue-rotate:initial;--tw-backdrop-invert:initial;--tw-backdrop-opacity:initial;--tw-backdrop-saturate:initial;--tw-backdrop-sepia:initial;--tw-duration:initial;--tw-content:"";--tw-animation-delay:0s;--tw-animation-direction:normal;--tw-animation-duration:initial;--tw-animation-fill-mode:none;--tw-animation-iteration-count:1;--tw-enter-blur:0;--tw-enter-opacity:1;--tw-enter-rotate:0;--tw-enter-scale:1;--tw-enter-translate-x:0;--tw-enter-translate-y:0;--tw-exit-blur:0;--tw-exit-opacity:1;--tw-exit-rotate:0;--tw-exit-scale:1;--tw-exit-translate-x:0;--tw-exit-translate-y:0;--scroll-fade-t:0px;--scroll-fade-b:0px;--scroll-fade-s:0px;--scroll-fade-e:0px;--scroll-fade-mask:initial;--shimmer-image:initial;--shimmer-text-fill:initial}}}@layer theme{:root,:host{--font-sans:"Onest", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--spacing:.25rem;--container-md:28rem;--container-lg:32rem;--container-xl:36rem;--container-2xl:42rem;--container-3xl:48rem;--container-4xl:56rem;--text-sm:.875rem;--text-sm--line-height:calc(1.25 / .875);--text-base:1rem;--text-base--line-height:calc(1.5 / 1);--text-lg:1.125rem;--text-lg--line-height:calc(1.75 / 1.125);--text-xl:1.25rem;--text-xl--line-height:calc(1.75 / 1.25);--text-2xl:1.5rem;--text-2xl--line-height:calc(2 / 1.5);--text-3xl:1.875rem;--text-3xl--line-height:calc(2.25 / 1.875);--font-weight-normal:400;--font-weight-medium:500;--font-weight-semibold:600;--font-weight-bold:700;--font-weight-extrabold:800;--font-weight-black:900;--leading-normal:1.5;--radius-sm:8px;--radius-md:14px;--radius-lg:14px;--radius-xl:20px;--radius-2xl:20px;--radius-3xl:20px;--radius-4xl:24px;--animate-spin:spin 1s linear infinite;--animate-pulse:pulse 2s cubic-bezier(.4, 0, .6, 1) infinite;--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono);--color-ring:var(--ring);--color-input:var(--input);--color-border:var(--border);--color-destructive:var(--destructive);--color-accent-foreground:var(--accent-foreground);--color-accent:var(--accent);--color-muted-foreground:var(--muted-foreground);--color-muted:var(--muted);--color-secondary-foreground:var(--secondary-foreground);--color-secondary:var(--secondary);--color-primary-foreground:var(--primary-foreground);--color-primary:var(--primary);--color-popover-foreground:var(--popover-foreground);--color-popover:var(--popover);--color-card-foreground:var(--card-foreground);--color-card:var(--card);--color-foreground:var(--foreground);--color-background:var(--background)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, 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