.icon-btn:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px}.icon-btn{border:1px solid var(--color-border-strong);border-radius:var(--btn-radius);width:36px;height:36px;color:var(--color-text);cursor:pointer;background:#fff;place-items:center;padding:0;transition:border-color .15s,background-color .15s,color .15s;display:inline-grid}.icon-btn:hover{border-color:var(--color-accent);color:var(--color-accent-strong);background:#f3f7fc}@media (prefers-reduced-motion:reduce){.icon-btn{transition:none}}.page-body{padding-block:var(--space-5) var(--space-6)}.post-card{gap:var(--space-2);flex-direction:column;height:100%;display:flex;position:relative}.post-card__media{aspect-ratio:16/10;background:#e8edf3;border-radius:12px;position:relative;overflow:hidden}.post-card__media img{object-fit:cover;transition:transform .4s}.post-card__body{flex-direction:column;flex:1;gap:.5rem;display:flex}.post-card__topic{letter-spacing:.1em;text-transform:uppercase;color:var(--color-navy);font-size:.75rem;font-weight:700}.post-card__title{letter-spacing:-.01em;font-size:1.1875rem;font-weight:600;line-height:1.3}.post-card__title a{color:var(--color-text);text-decoration:none}.post-card__title a:after{content:"";z-index:1;position:absolute;inset:0}.post-card:hover .post-card__title a{text-decoration:underline;-webkit-text-decoration-color:var(--color-navy);text-decoration-color:var(--color-navy);text-underline-offset:5px;text-decoration-thickness:2px}.post-card__title a:focus-visible{outline:none}.post-card:has(.post-card__title a:focus-visible){outline:2px solid var(--color-focus);outline-offset:6px;border-radius:12px}.post-card__summary{-webkit-line-clamp:2;color:var(--color-text-muted);-webkit-box-orient:vertical;font-size:.9375rem;line-height:1.6;display:-webkit-box;overflow:hidden}.post-card--featured .post-card__summary{-webkit-line-clamp:3;font-size:var(--text-lg)}.post-card__meta{font-size:var(--text-sm);color:var(--color-text-muted);flex-wrap:wrap;align-items:center;gap:.5rem .75rem;margin-top:auto;padding-top:.25rem;display:flex}.post-card__dot{background:currentColor;border-radius:50%;width:3px;height:3px}.post-card__meta .like{z-index:2;margin-left:auto;position:relative}.knowledge-lead{gap:var(--space-4);margin-block:var(--space-2) var(--space-5);padding-bottom:var(--space-5);border-bottom:1px solid var(--color-border);display:grid}@media (min-width:1100px){.knowledge-lead{gap:var(--space-5);grid-template-columns:minmax(0,8fr) minmax(0,4fr)}}.knowledge-lead__title{letter-spacing:.16em;text-transform:uppercase;color:var(--color-navy);align-items:center;gap:.6rem;font-size:.75rem;font-weight:700;display:flex}.knowledge-lead__title:before{content:"";background:var(--color-navy);border-radius:2px;width:4px;height:14px}.knowledge-lead__aside{gap:var(--space-2);flex-direction:column;display:flex}@media (min-width:1100px){.knowledge-lead__aside{padding-left:var(--space-4);border-left:1px solid var(--color-border)}}.knowledge-lead__list{flex-direction:column;display:flex}.knowledge-lead__list>li+li{border-top:1px solid var(--color-border)}.knowledge-lead__list>li{padding-block:var(--space-2)}.post-card--compact{align-items:start;gap:var(--space-2);grid-template-columns:7rem minmax(0,1fr);display:grid}.post-card--compact .post-card__media{aspect-ratio:4/3;border-radius:8px}.post-card--compact .post-card__body{gap:.35rem}.post-card--compact .post-card__title{font-size:1rem;line-height:1.35}.post-card--compact .post-card__meta{padding-top:0;font-size:.8125rem}.post-card--featured{gap:var(--space-3)}.post-card--featured .post-card__title{font-size:var(--text-2xl);letter-spacing:-.02em;line-height:1.15}@media (min-width:960px){.post-card--featured .post-card__media{aspect-ratio:16/9}.post-card--featured .post-card__body{gap:var(--space-2)}}@media (min-width:1024px){.toc-mobile{display:none}}.toc__title{margin-bottom:var(--space-1);font-size:var(--text-sm);color:var(--color-text);font-weight:600}.toc__list,.toc-mobile ol{border-left:1px solid var(--color-border);flex-direction:column;margin:0;padding:0;list-style:none;display:flex}.toc__list a,.toc-mobile a{font-size:var(--text-sm);color:var(--color-text-muted);border-left:2px solid #0000;margin-left:-1px;padding:.35rem 0 .35rem .9rem;line-height:1.4;text-decoration:none;display:block}.toc__sub a{padding-left:1.6rem;font-size:.8125rem}.toc__list a:hover,.toc-mobile a:hover{color:var(--color-navy)}.toc__list a[aria-current=location]{border-left-color:var(--color-navy);color:var(--color-navy);font-weight:600}.toc-mobile{margin-bottom:var(--space-4);padding:var(--space-2);border:1px solid var(--color-border);background:#f6f9fc;border-radius:12px}.toc-mobile summary{cursor:pointer;font-weight:600}.toc-mobile ol{margin-top:var(--space-2)}.article-math{padding:var(--space-2);border-left:3px solid var(--color-navy);background:var(--color-surface-soft);border-radius:0 8px 8px 0}.article-math__formula{color:var(--color-text);font-size:1.05em;overflow-x:auto}.article-math__formula math{margin:0;display:block}.article-math figcaption{margin-top:.75rem}@media (min-width:640px){.article-math{padding:var(--space-3)}.article-math__formula{font-size:1.2em}}@media (prefers-reduced-motion:reduce){.post-card__media img{transition:none}.post-card:hover .post-card__media img{transform:none}}.reading-progress{top:var(--header-height);z-index:49;background:0 0;height:3px;position:fixed;left:0;right:0}.reading-progress__bar{background:var(--color-navy);transform-origin:0;height:100%;transform:scaleX(0)}.post__footer .icon-btn{width:40px;min-width:40px;height:40px;min-height:40px;color:var(--color-navy);border-radius:50%;padding:0}.post__footer .icon-btn:hover{border-color:var(--color-navy);background:var(--color-navy);color:#fff}.post-arrows{gap:.5rem;display:flex}.post-arrows__btn{border:1px solid var(--color-border-strong);width:40px;height:40px;color:var(--color-navy);border-radius:50%;place-items:center;transition:background-color .2s,border-color .2s,color .2s;display:grid}a.post-arrows__btn:hover{border-color:var(--color-navy);background:var(--color-navy);color:#fff}.post-arrows__btn[data-disabled=true]{opacity:.35}.post-arrows__icon--prev{transform:rotate(180deg)}.knowledge-page{padding-top:clamp(2rem,1.5rem + 2vw,3.25rem)}.kb-head{padding-bottom:0}.kb-eyebrow{margin-bottom:var(--space-2);letter-spacing:.16em;text-transform:uppercase;color:var(--color-navy);font-size:.75rem;font-weight:700}.kb-head__title{letter-spacing:-.035em;color:var(--color-navy);font-size:clamp(2rem,1.5rem + 2vw,3rem);font-weight:700;line-height:1.02}.kb-head__lead{max-width:40rem;margin-top:var(--space-2);font-size:var(--text-lg);color:var(--color-text-muted);line-height:1.6}.kb-head__stats{margin-top:var(--space-2);font-size:var(--text-sm);color:var(--color-text-muted);flex-wrap:wrap;align-items:center;display:flex}.kb-head__stats>span{align-items:center;display:inline-flex}.kb-head__dot{background:var(--color-border-strong);border-radius:50%;width:3px;height:3px;margin-inline:.65rem}.kb-search{width:100%;max-width:46rem;margin-top:var(--space-4)}.kb-search .search__input{min-height:50px;padding-left:2.75rem;padding-right:2.75rem;font-size:1rem;box-shadow:0 10px 28px -22px #0f1f3373}.kb-search .search__icon{left:1rem}.kb-search .search__input:focus-visible{border-color:var(--color-navy);box-shadow:0 0 0 4px #0f1f331a}.kb-search .search__input::-webkit-search-cancel-button{appearance:none}.kb-tabs{margin-top:.75rem;margin-bottom:var(--space-3);border-bottom:1px solid var(--color-border);scrollbar-width:none;gap:0;display:flex;overflow-x:auto}.kb-tabs::-webkit-scrollbar{display:none}.kb-tab{min-height:44px;font:inherit;color:var(--color-text-muted);white-space:nowrap;cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;flex-shrink:0;align-items:center;gap:.4rem;margin-bottom:-1px;padding:.5rem .75rem .7rem;font-size:.9375rem;transition:color .2s,border-color .2s;display:inline-flex}.kb-tab:hover{color:var(--color-navy);border-bottom-color:var(--color-border-strong)}.kb-tab[aria-pressed=true]{color:var(--color-navy);border-bottom-color:var(--color-navy);font-weight:600}.kb-tab:focus-visible{outline:2px solid var(--color-focus);outline-offset:-2px;border-radius:4px}.kb-tab__count{font-variant-numeric:tabular-nums;color:var(--color-text-muted);font-size:.75rem;font-weight:600}.kb-tab[aria-pressed=true] .kb-tab__count{color:var(--color-navy)}@media (max-width:639px){.kb-tabs{margin-inline:calc(var(--gutter) * -1);padding-inline:calc(var(--gutter) - .9rem)}}@media (pointer:coarse){.toc a,.toc-mobile a{padding-block:.55rem;display:block}}@media (max-width:639px){.kb-tabs{-webkit-mask-image:linear-gradient(90deg,#000 85%,#0000);mask-image:linear-gradient(90deg,#000 85%,#0000)}}