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a.active{color:var(--orange);border-left-color:var(--orange)}.rail-tiles{display:flex;flex-direction:column;gap:.7rem}.rail-tiles .tile2{padding:.7rem .9rem}.rail-tiles .tile2-label{font-size:.74rem;margin-bottom:.3rem}.rail-tiles .rail-links a{padding:.28rem 0}.rail-tiles .rl-t{font-size:.86rem}.rail-tiles .rl-d{font-size:.7rem;line-height:1.25}@media(max-width:60rem){.surface-layout{grid-template-columns:minmax(0,1fr)}.page-rail{display:none}}.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;font-size:.82rem;margin:0 0 1.1rem}.crumb a{color:var(--fg-soft);text-decoration:none}.crumb a:hover{color:var(--orange)}.crumb span[aria-hidden]{color:var(--slate);opacity:.7}.crumb .crumb-cur{color:var(--fg)}.prose h2{scroll-margin-top:5.5rem}.callout-info{border-left-color:var(--electric)}.callout-info .callout-title{color:var(--electric)}.callout-warning{border-left-color:#f5a623}.callout-warning .callout-title{color:#f5b740}@media(max-width:48rem){main{padding:1.6rem 1rem 3rem}.prose{padding:1.4rem 1.15rem;border-radius:12px}.surface-grid{grid-template-columns:1fr}.prose table,figure.matrix,figure.diagram{display:block;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}.prose table{width:max-content;min-width:100%}figure.matrix table{min-width:30rem}.hero2{padding:2.6rem 1rem 2.4rem}.hero2 h1{font-size:clamp(2rem,9vw,2.6rem)}}