pre code.hljs{padding:1em;display:block;overflow-x:auto}code.hljs{padding:3px 5px}.hljs{color:#383a42;background:#fafafa}.hljs-comment,.hljs-quote{color:#a0a1a7;font-style:italic}.hljs-doctag,.hljs-keyword,.hljs-formula{color:#a626a4}.hljs-section,.hljs-name,.hljs-selector-tag,.hljs-deletion,.hljs-subst{color:#e45649}.hljs-literal{color:#0184bb}.hljs-string,.hljs-regexp,.hljs-addition,.hljs-attribute,.hljs-meta .hljs-string{color:#50a14f}.hljs-attr,.hljs-variable,.hljs-template-variable,.hljs-type,.hljs-selector-class,.hljs-selector-attr,.hljs-selector-pseudo,.hljs-number{color:#986801}.hljs-symbol,.hljs-bullet,.hljs-link,.hljs-meta,.hljs-selector-id,.hljs-title{color:#4078f2}.hljs-built_in,.hljs-title.class_,.hljs-class .hljs-title{color:#c18401}.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}.hljs-link{text-decoration:underline}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background:var(--color-soft);color:var(--color-ink);line-height:var(--leading-normal)}:root[data-theme=dark] body{background:var(--color-ground)}.btn{justify-content:center;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);border:var(--border-width) solid transparent;border-radius:var(--radius-pill);color:var(--color-ink);font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-medium);line-height:var(--leading-tight);cursor:pointer;background:0 0;text-decoration:none;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--color-accent);color:var(--color-ground)}.btn-primary:hover:not(:disabled){background:var(--color-ink)}.btn-secondary{background:var(--color-surface);border-color:var(--color-ink)}.btn-secondary:hover:not(:disabled){border-color:var(--color-accent);color:var(--color-accent)}.btn-ghost{color:var(--color-accent)}.btn-ghost:hover:not(:disabled){background:var(--color-surface);border-color:var(--color-line)}.btn-danger{background:var(--color-surface);border-color:var(--color-danger);color:var(--color-danger)}.btn-danger:hover:not(:disabled){background:var(--color-danger-soft)}.btn-sm{padding:var(--space-2) var(--space-4);font-size:var(--text-sm)}.btn-block{width:100%}.field{gap:var(--space-1);margin-bottom:var(--space-4);flex-direction:column;display:flex}.field__label{color:var(--color-ink);font-size:var(--text-sm);font-weight:var(--weight-medium)}.input{width:100%;padding:var(--space-3) var(--space-4);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-small);background:var(--color-surface);color:var(--color-ink);font-family:var(--font-body);font-size:var(--text-base);line-height:var(--leading-normal)}.input::placeholder{color:var(--color-muted)}.input:hover{border-color:var(--color-muted)}.input:focus{border-color:var(--color-accent)}.input[aria-invalid=true]{border-color:var(--color-danger)}textarea.input{min-height:calc(var(--space-9) + var(--space-6));resize:vertical}.notice{padding:var(--space-3) var(--space-4);border-radius:var(--radius-small);font-size:var(--text-sm)}.notice-danger{background:var(--color-danger-soft);color:var(--color-danger)}.notice-success{background:var(--color-success-soft);color:var(--color-success-on-light)}.notice-warning{background:var(--color-warning-soft);color:var(--color-warning)}.card{padding:var(--space-6);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-card);background:var(--color-surface)}.pill{padding:var(--space-1) var(--space-3);border-radius:var(--radius-pill);background:var(--color-soft);color:var(--color-ink);font-size:var(--text-sm);font-weight:var(--weight-medium);align-items:center;display:inline-flex}.card-link{position:relative}.card-link:hover{border-color:var(--color-accent)}.card-link__target{color:inherit;text-decoration:none}.card-link__target:after{content:"";border-radius:var(--card-link-radius,var(--radius-card));position:absolute;inset:0}.card-link .btn{z-index:1;position:relative}.card-link__target:focus-visible{outline:none}.card-link__target:focus-visible:after{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.card-grid{grid-template-columns:repeat(auto-fill, minmax(min(var(--card-min-width), 100%), 1fr));gap:var(--space-4);display:grid}.page{width:100%;max-width:var(--container-width);padding:var(--space-6) var(--space-5) var(--space-8);margin:0 auto}.page--narrow{max-width:calc(var(--reading-width) + 2 * var(--space-5))}.page--form{max-width:calc(var(--form-width) + 2 * var(--space-5));padding-top:var(--space-8)}.page__back{margin-bottom:var(--space-4);margin-left:calc(-1 * var(--space-4))}.page__header{justify-content:space-between;align-items:flex-start;gap:var(--space-4);margin-bottom:var(--space-6);padding-bottom:var(--space-5);border-bottom:var(--border-width) solid var(--color-line);flex-wrap:wrap;display:flex}.page__title{font-family:var(--font-heading);font-size:var(--text-2xl);font-weight:var(--weight-bold);line-height:var(--leading-tight);overflow-wrap:anywhere;margin:0}.page__lead{margin:var(--space-2) 0 0;color:var(--color-muted)}.page-status{color:var(--color-muted)}.section+.section{margin-top:var(--space-7)}.section__header{justify-content:space-between;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4);flex-wrap:wrap;display:flex}.section__title{font-family:var(--font-heading);font-size:var(--text-lg);font-weight:var(--weight-medium);line-height:var(--leading-tight);margin:0}.inline-form{gap:var(--space-3);margin-bottom:var(--space-4);padding:var(--space-4);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-small);background:var(--color-surface);flex-wrap:wrap;display:flex}.inline-form>.input{flex:1 1 var(--card-min-width)}.inline-form>.notice{flex-basis:100%}.muted{color:var(--color-muted)}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.btn:focus-visible,.input:focus-visible,.auth-card a:focus-visible,.app-header a:focus-visible,.user-badge button:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}@media (width<=40rem){.card{padding:var(--space-5)}.page{padding:var(--space-5) var(--space-4) var(--space-7)}.page--form{padding-top:var(--space-6)}.page__title{font-size:var(--text-xl)}}.user-badge{flex-shrink:0;position:relative}.user-badge__pill{align-items:center;gap:var(--space-2);padding:var(--space-1) var(--space-3) var(--space-1) var(--space-1);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-pill);background:var(--color-surface);font-family:var(--font-body);cursor:pointer;display:flex}.user-badge__pill:hover{border-color:var(--color-accent)}.user-badge__avatar{width:var(--space-6);height:var(--space-6);border-radius:var(--radius-pill);background:var(--color-accent);color:var(--color-ground);font-family:var(--font-heading);font-size:var(--text-sm);font-weight:var(--weight-bold);flex-shrink:0;justify-content:center;align-items:center;display:flex}.user-badge__text{line-height:var(--leading-tight);flex-direction:column;align-items:flex-start;display:flex}.user-badge__name{color:var(--color-ink);font-size:var(--text-sm);font-weight:var(--weight-medium)}.user-badge__role,.user-badge__caret{color:var(--color-muted);font-size:var(--text-sm)}.user-badge__menu{top:calc(100% + var(--space-2));z-index:var(--z-badge);min-width:calc(var(--space-9) * 2);padding:var(--space-1);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-small);background:var(--color-surface);box-shadow:var(--shadow-md);flex-direction:column;display:flex;position:absolute;right:0}.user-badge__item{padding:var(--space-2) var(--space-3);border-radius:var(--radius-small);color:var(--color-ink);font-family:var(--font-body);font-size:var(--text-base);text-align:left;cursor:pointer;background:0 0;border:0}.user-badge__item:hover{background:var(--color-soft)}.user-badge__item--danger{color:var(--color-danger)}.user-badge__item--danger:hover{background:var(--color-danger-soft)}@media (width<=30rem){.user-badge__text{display:none}}.unread-badge{min-width:calc(var(--space-4) + var(--space-1));height:calc(var(--space-4) + var(--space-1));padding:0 var(--space-1);border-radius:var(--radius-pill);background:var(--color-danger);color:var(--color-ground);font-family:var(--font-body);font-size:var(--text-sm);font-weight:var(--weight-bold);flex-shrink:0;justify-content:center;align-items:center;line-height:1;display:inline-flex}.question-chip{margin-right:var(--space-2);padding:0 var(--space-2);border-radius:var(--radius-pill);background:var(--color-soft);color:var(--color-accent);font-size:var(--text-sm);font-weight:var(--weight-bold);display:inline-block}.notify-bell{flex-shrink:0}.notify-bell__button{width:calc(var(--space-6) + var(--space-2));height:calc(var(--space-6) + var(--space-2));border:var(--border-width) solid var(--color-line);border-radius:var(--radius-pill);background:var(--color-surface);color:var(--color-ink);cursor:pointer;justify-content:center;align-items:center;padding:0;display:flex;position:relative}.notify-bell__button:hover{border-color:var(--color-accent);color:var(--color-accent)}.notify-bell__button:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.notify-bell__icon{width:var(--space-5);height:var(--space-5);fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round}.notify-bell__badge{top:calc(var(--space-1) * -1);right:calc(var(--space-1) * -1);position:absolute}.notify-menu{top:calc(100% + var(--space-2));z-index:var(--z-badge);width:min(calc(var(--panel-width) - var(--space-5)), calc(100vw - 2 * var(--space-4)));max-height:min(70vh, calc(var(--space-9) * 4));padding:var(--space-2);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-small);background:var(--color-surface);box-shadow:var(--shadow-md);position:absolute;right:0;overflow-y:auto}.notify-menu__title{margin:var(--space-1) var(--space-2) var(--space-2);color:var(--color-muted);font-size:var(--text-sm);font-weight:var(--weight-bold)}.notify-menu__empty{margin:var(--space-2);color:var(--color-muted);font-size:var(--text-sm)}.notify-menu__list{margin:0;padding:0;list-style:none}.notify-item{gap:var(--space-1);padding:var(--space-2) var(--space-3);border-radius:var(--radius-small);color:var(--color-ink);flex-direction:column;text-decoration:none;display:flex}.notify-item:hover{background:var(--color-soft)}.notify-item:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:calc(var(--focus-ring-width) * -1)}.notify-item__top{justify-content:space-between;align-items:center;gap:var(--space-2);display:flex}.notify-item__who{min-width:0;font-size:var(--text-sm);font-weight:var(--weight-bold);overflow-wrap:anywhere}.notify-item__preview{color:var(--color-ink);font-size:var(--text-sm);overflow-wrap:anywhere}.notify-item__time{color:var(--color-muted);font-size:var(--text-sm)}.chat-fab .unread-badge{top:calc(var(--space-1) * -1);right:calc(var(--space-1) * -1);box-shadow:0 0 0 calc(var(--border-width) * 2) var(--color-ground);position:absolute}.btn .unread-badge{margin-left:var(--space-1)}.inbox-list{gap:var(--space-2);flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.inbox-item{justify-content:space-between;align-items:flex-start;gap:var(--space-3);padding:var(--space-3) var(--space-4);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-small);background:var(--color-surface);color:var(--color-ink);text-decoration:none;display:flex}.inbox-item:hover{border-color:var(--color-accent)}.inbox-item:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.inbox-item__main{gap:var(--space-1);flex-direction:column;min-width:0;display:flex}.inbox-item__who{font-weight:var(--weight-bold);overflow-wrap:anywhere}.inbox-item__preview,.inbox-item__time{color:var(--color-muted);font-size:var(--text-sm);overflow-wrap:anywhere}.lesson-progress__labels{justify-content:space-between;gap:var(--space-2);margin-bottom:var(--space-2);color:var(--color-muted);font-size:var(--text-sm);white-space:nowrap;display:flex}.lesson-progress__count{text-overflow:ellipsis;flex:0 1000 auto;min-width:0;overflow:hidden}.lesson-progress__emoji{flex-shrink:0}.lesson-progress__percent{text-overflow:ellipsis;flex:0 auto;min-width:0;margin-left:auto;overflow:hidden}.lesson-progress__track{height:var(--space-2);border-radius:var(--radius-pill);background:var(--color-line);overflow:hidden}.lesson-progress__fill{border-radius:var(--radius-pill);background:var(--color-accent);height:100%;transition:width .3s}.lesson-progress--complete .lesson-progress__fill{background:var(--color-success-on-light)}.lesson-progress--complete .lesson-progress__percent{color:var(--color-success-on-light);font-weight:var(--weight-bold)}.lessons-icon{width:var(--space-5);height:var(--space-5);fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round}.lessons-panel-open,.lessons-panel-open body{overflow:hidden}.lessons-panel-layer{z-index:calc(var(--z-badge) + 1);position:fixed;inset:0}.lessons-panel__backdrop{background:color-mix(in srgb, var(--color-scrim) 50%, transparent);animation:.2s lessons-panel-fade;position:absolute;inset:0}.lessons-panel{width:min(var(--panel-width), calc(100% - var(--space-7)));overscroll-behavior:contain;border-right:var(--border-width) solid var(--color-line);background:var(--color-surface);box-shadow:var(--shadow-lg);flex-direction:column;animation:.2s lessons-panel-slide;display:flex;position:absolute;top:0;bottom:0;left:0;overflow-y:auto}@keyframes lessons-panel-slide{0%{transform:translate(-100%)}to{transform:translate(0)}}@keyframes lessons-panel-fade{0%{opacity:0}to{opacity:1}}@media (prefers-reduced-motion:reduce){.lessons-panel,.lessons-panel__backdrop{animation:none}}.lessons-panel__head{justify-content:space-between;align-items:flex-start;gap:var(--space-3);padding:var(--space-5) var(--space-4) var(--space-4) var(--space-5);border-bottom:var(--border-width) solid var(--color-line);display:flex}.lessons-panel__heading{min-width:0}.lessons-panel__back{margin-bottom:var(--space-2);color:var(--color-accent);font-size:var(--text-sm);font-weight:var(--weight-medium);text-decoration:none;display:inline-block}.lessons-panel__back:hover{text-underline-offset:var(--space-1);text-decoration:underline}.lessons-panel__back:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.lessons-panel__title{font-family:var(--font-body);font-size:var(--text-lg);font-weight:var(--weight-bold);line-height:var(--leading-tight);margin:0}.lessons-panel__course{margin:var(--space-1) 0 0;color:var(--color-muted);font-size:var(--text-sm);overflow-wrap:anywhere}.lessons-panel__close{padding:var(--space-2);flex-shrink:0}.lessons-panel__status{padding:var(--space-5);color:var(--color-muted);font-size:var(--text-sm)}.lessons-panel__status .notice{margin:0 0 var(--space-3)}.lessons-panel__list{padding:var(--space-2) 0;margin:0;list-style:none}.lessons-panel__link{grid-template-columns:var(--space-6) 1fr auto;align-items:baseline;gap:var(--space-3);padding:var(--space-3) var(--space-5);color:var(--color-ink);text-decoration:none;display:grid}.lessons-panel__link:hover{color:var(--color-accent)}.lessons-panel__link:hover .lessons-panel__name{text-underline-offset:var(--space-1);text-decoration:underline}.lessons-panel__link:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:calc(var(--focus-ring-width) * -1)}.lessons-panel__link--current{background:var(--color-soft);box-shadow:inset var(--space-1) 0 0 var(--color-accent);font-weight:var(--weight-bold)}.lessons-panel__num{color:var(--color-accent);font-family:var(--font-heading);font-size:var(--text-sm);font-weight:var(--weight-medium);text-align:right}.lessons-panel__name{overflow-wrap:anywhere;min-width:0}.lessons-panel__count{color:var(--color-muted);font-size:var(--text-sm);font-weight:var(--weight-regular);white-space:nowrap}.lessons-panel__count--solved{color:var(--color-success-on-light);font-weight:var(--weight-bold)}.app-header{z-index:var(--z-header);border-bottom:var(--border-width) solid var(--color-line);background:var(--color-surface);position:sticky;top:0}.app-header__inner{align-items:center;gap:var(--space-5);max-width:var(--container-width);padding:var(--space-3) var(--space-5);margin:0 auto;display:flex}.app-header__brand{font-family:var(--font-heading);font-size:var(--text-lg);font-weight:var(--weight-bold);letter-spacing:var(--tracking-logo);text-transform:uppercase;line-height:var(--leading-tight);color:var(--color-ink);white-space:nowrap;text-decoration:none}.app-header__nav{flex:auto;min-width:0}.app-header__link{color:var(--color-ink);font-weight:var(--weight-medium);text-decoration:none}.app-header__link:hover{color:var(--color-accent)}.app-header__inner--lesson{grid-template-columns:minmax(max-content, 1fr) minmax(0, var(--reading-width)) minmax(max-content, 1fr);max-width:none;display:grid}.app-header__inner--lesson .app-header__end{justify-self:end}.app-header__end{align-items:center;gap:var(--space-2);flex-shrink:0;display:flex;position:relative}.app-header__lesson{align-items:center;gap:var(--space-3);min-width:0;display:flex}.app-header__lessons-btn{padding:var(--space-3);flex-shrink:0}.app-header__lesson-text{gap:var(--space-1);flex-direction:column;flex:auto;min-width:0;display:flex}.app-header__crumbs{min-width:0;line-height:var(--leading-tight);white-space:nowrap;margin:0;padding:0;list-style:none;display:flex}.app-header__crumb{text-overflow:ellipsis;flex:0 auto;min-width:0;overflow:hidden}.app-header__crumb--course{max-width:45%}.app-header__crumb--lesson{color:var(--color-ink);font-weight:var(--weight-medium);display:flex;overflow:visible}.app-header__title-btn{min-width:0;color:inherit;font:inherit;text-align:start;white-space:nowrap;text-overflow:ellipsis;cursor:pointer;background:0 0;border:0;padding:0;overflow:hidden}.app-header__title-btn:hover{color:var(--color-accent)}.app-header__title-btn:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.app-header__crumb-link{color:var(--color-muted);font-weight:var(--weight-medium);text-underline-offset:var(--space-1);text-decoration:underline}.app-header__crumb-link:hover{color:var(--color-accent)}.app-header__crumb-link:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.app-header__crumb-sep{margin:0 var(--space-2);color:var(--color-muted);font-weight:var(--weight-regular);flex-shrink:0}.app-header__next{color:var(--color-success-on-light);text-decoration:none}.app-header__next:hover,.app-header__next:focus-visible{text-decoration:underline}.app-header__next:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:calc(var(--focus-ring-width) * -1)}.app-header__lesson .lesson-progress__labels{margin-bottom:var(--space-1);line-height:var(--leading-tight)}.app-header__lesson .lesson-progress__track{height:var(--space-1)}@media (width<=40rem){.app-header__inner{gap:var(--space-4);padding:var(--space-2) var(--space-4)}.app-header__brand{font-size:var(--text-base)}.app-header__crumb--course,.app-header__crumb-sep{display:none}.app-header__inner--lesson{gap:var(--space-3);grid-template-columns:minmax(0,1fr) auto}.app-header__inner--lesson .app-header__brand{display:none}.app-header__lesson{gap:var(--space-2)}.app-header__lessons-btn{padding:var(--space-2)}}@media (width<=30rem){.app-header__lesson .lesson-progress__verb,.app-header__lesson .lesson-progress--complete .lesson-progress__count{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}}.lesson-block{margin-bottom:var(--space-5);padding:var(--space-6);border:var(--border-width) solid var(--color-line);border-radius:var(--radius-card);background:var(--color-surface)}.lesson-block--solved{border-color:var(--color-success-on-light);box-shadow:inset 0 0 0 var(--border-width) var(--color-success-on-light)}.lesson-block__head{align-items:center;gap:var(--space-2);margin-bottom:var(--space-4);flex-wrap:wrap;display:flex}.lesson-block__badge{padding:var(--space-1) var(--space-3);border-radius:var(--radius-pill);background:var(--color-soft);color:var(--color-accent);font-family:var(--font-heading);font-size:var(--text-sm);font-weight:var(--weight-medium);align-items:center;display:inline-flex}.lesson-block__solved{padding:var(--space-1) 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var(--focus-ring-color);outline-offset:0}.password-input__icon{width:var(--space-5);height:var(--space-5);fill:none;stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round}.auth-card__title{margin:0 0 var(--space-5);font-family:var(--font-heading);font-size:var(--text-xl);font-weight:var(--weight-bold);line-height:var(--leading-tight)}.auth-card__error{margin-bottom:var(--space-4)}.auth-card__footer{margin:var(--space-5) 0 0;color:var(--color-muted);text-align:center}.auth-card a{color:var(--color-accent);font-weight:var(--weight-medium)}.auth-card__links{gap:var(--space-2) var(--space-5);margin:var(--space-5) 0 0;flex-wrap:wrap;display:flex}.course-thumb{aspect-ratio:4/3;isolation:isolate;background:var(--color-cover);overflow:hidden}.course-thumb__img{object-fit:cover;mix-blend-mode:multiply;width:100%;height:100%;display:block}:root[data-theme=dark] .course-thumb{padding:var(--space-2);position:relative}:root[data-theme=dark] 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