/* PASTDOOR uses the existing light / Halloween tokens and site toggle. */
.pastdoor{--pd-accent:var(--seasonal-amber,var(--signal-primary));}
.pastdoor .shell{max-width:1280px}.pastdoor h2{font-size:clamp(2rem,4vw,3.6rem);line-height:1.1;letter-spacing:-.035em;margin:1rem 0 1.6rem}.pastdoor h3{font-size:1.3rem;line-height:1.3;margin:.65rem 0 1rem}.pastdoor p{line-height:1.75}.pastdoor .signal-nav{display:none}.pastdoor .header-actions{flex-wrap:wrap}.pastdoor .site-header{position:relative}.pd-hero{padding:3rem 0 0}.pd-kicker{display:flex;justify-content:space-between;gap:1rem;font: .75rem var(--font-system);letter-spacing:.12em;color:var(--text-secondary)}.pd-hero h1{font-size:clamp(4rem,14.5vw,12rem);font-weight:900;line-height:1;letter-spacing:-.075em;margin:1.6rem 0 .8rem}.pd-hero h1 span{color:var(--pd-accent)}.pd-subtitle{font-size:clamp(1.1rem,2.3vw,1.8rem);max-width:900px;margin-bottom:2rem}.pd-art{margin-top:2rem;border:1px solid var(--border-subtle);background:#090909}.pd-art img{width:100%;height:auto;aspect-ratio:1657/949;object-fit:contain}.pd-art figcaption{color:#c7c1b8;padding:.6rem 1rem;font: .75rem var(--font-system);border-top:1px solid #393027}.pd-intro{display:grid;grid-template-columns:1fr 1.2fr;gap:4rem;padding:3rem 0}.pd-intro>p{font-size:1.5rem;line-height:1.45}.pd-intro strong{color:var(--pd-accent);font-weight:500}.pd-toc{background:var(--surface-primary);border-block:1px solid var(--border-subtle)}.pd-toc .shell{display:flex;flex-wrap:wrap;gap:1rem 2rem;padding-block:1rem}.pd-toc a{font:.78rem var(--font-system);text-decoration:none}.pd-section{padding:5rem 0;border-bottom:1px solid var(--border-subtle);scroll-margin-top:2rem}.pd-lead{max-width:900px;font-size:1.18rem;color:var(--text-secondary);margin-bottom:2rem}.pd-grid{display:grid;gap:1rem}.pd-grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}.pd-grid article,.pd-branches>div{padding:1.8rem;background:var(--surface-primary);border:1px solid var(--border-subtle)}.pd-index{font:.75rem var(--font-system);letter-spacing:.07em;color:var(--pd-accent)}.pd-source{font-size:.82rem;color:var(--text-secondary);margin-top:1.5rem}.pd-diagram{padding:2rem;background:var(--surface-primary);border:1px solid var(--border-subtle)}.pd-input{text-align:center;color:var(--text-secondary);font:.8rem var(--font-system)}.pd-input strong{display:block;font:1.2rem var(--font-interface);margin-top:.7rem;color:var(--text-primary)}.pd-arrow{text-align:center;font-size:1.6rem;color:var(--pd-accent);padding:.5rem}.pd-gate{border-block:5px solid var(--pd-accent);padding:1.6rem;text-align:center;background:var(--surface-secondary)}.pd-gate span{display:block;font-size:2.1rem;font-weight:800;letter-spacing:.12em}.pd-gate small{font:.7rem var(--font-system)}.pd-downstream{padding:1.5rem;border:1px solid var(--pd-accent)}.pd-node{padding:1.3rem;text-align:center;border:1px solid var(--border-subtle);margin-top:1rem;background:var(--surface-secondary)}.pd-node span{padding:0 1rem}.pd-branches p{font-size:.95rem}.pd-branches hr{border:0;border-top:1px solid var(--border-subtle);margin:1.2rem 0}.pd-branches small{color:var(--pd-accent)}.pd-outcome{text-align:center;padding-top:1.5rem}.pd-runtime{margin:1rem 0;padding:1rem;border:1px dashed var(--text-muted);display:flex;justify-content:space-between;gap:1rem}.pd-diagram figcaption,.pd-chain figcaption{font-size:.85rem;line-height:1.65;color:var(--text-secondary);margin-top:1rem}.pd-steps{list-style:none;counter-reset:steps;display:grid;grid-template-columns:repeat(5,1fr);padding:0;gap:1.5rem}.pd-steps li{counter-increment:steps;border-top:2px solid var(--pd-accent);padding-top:1rem}.pd-steps li:before{content:'0' counter(steps);font:.8rem var(--font-system);color:var(--pd-accent)}.pd-steps p{font-size:.95rem}.pd-model{display:flex;align-items:center;gap:1rem;padding:2rem;background:var(--surface-primary);border:1px solid var(--border-subtle)}.pd-model>div{flex:1;min-width:0}.pd-model small{display:block;color:var(--text-secondary);line-height:1.5}.pd-model strong{display:block;font:1.1rem var(--font-system);margin-top:1rem}.pd-model>b{color:var(--pd-accent)}.pd-equation{font:clamp(1.5rem,4vw,2.5rem) var(--font-system);padding:2.5rem 0;color:var(--pd-accent)}.pd-equation span{font:1rem var(--font-interface);color:var(--text-secondary);padding:0 1rem}.pd-questions h2{font-size:clamp(1.4rem,2vw,2rem)}.pd-surface{display:grid;grid-template-columns:1fr 1fr;gap:3rem;padding:2.8rem 0;border-top:1px solid var(--border-subtle);align-items:start}.pd-surface h3{font-size:1.7rem}.pd-surface p+p{margin-top:1rem}.pastdoor pre{white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;padding:1.5rem;background:var(--surface-secondary);border-left:3px solid var(--pd-accent);color:var(--text-primary);font:.85rem/1.8 var(--font-system);margin:0;max-width:100%;min-width:0}.pd-chain{padding:1.5rem;background:var(--surface-primary);border:1px solid var(--border-subtle);margin-bottom:2rem}.pd-chain>div{display:flex;align-items:center;justify-content:space-between;gap:.6rem;font:1rem var(--font-system)}.pd-chain b{color:var(--pd-accent)}.pd-boundary{margin:2rem 0;padding:2rem;border-left:4px solid var(--pd-accent);background:var(--surface-secondary)}.pd-boundary h3{font-family:var(--font-system);overflow-wrap:anywhere}.pd-subhead{margin-top:3rem!important}.pd-tags{display:flex;flex-wrap:wrap;gap:.6rem}.pd-tags span{padding:.6rem 1rem;border:1px solid var(--border-subtle);background:var(--surface-primary);font-size:.9rem}.pd-paper{display:flex;align-items:center;justify-content:space-between;gap:2rem;padding:2rem;background:var(--surface-primary);border:1px solid var(--border-subtle)}.pd-paper p{margin-top:.8rem}.pd-paper>div:last-child{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}.pd-lineage>div{display:grid;grid-template-columns:1fr 2fr;gap:2rem;padding:1.3rem 0;border-top:1px solid var(--border-subtle)}.pd-lineage dt{font-weight:700}.pd-lineage dd{color:var(--text-secondary)}.pastdoor details{border:0;border-bottom:1px solid var(--border-subtle);border-radius:0;background:none;padding:1.3rem 0}.pastdoor summary{font-weight:600;cursor:pointer;line-height:1.5}.pastdoor details p{margin:1rem 0;max-width:850px}.pastdoor a:focus-visible,.pastdoor summary:focus-visible,.pastdoor button:focus-visible{outline:3px solid var(--focus);outline-offset:5px}.pastdoor .eyebrow{color:var(--pd-accent)}
@media(max-width:800px){.pd-grid.three{grid-template-columns:1fr}.pd-intro,.pd-surface{grid-template-columns:1fr;gap:1.5rem}.pd-paper{align-items:flex-start;flex-direction:column;padding:1.3rem}.pd-paper>div:last-child{align-items:flex-start;flex-direction:column}.pd-steps{grid-template-columns:1fr}.pd-steps li{display:block}.pd-section{padding:3rem 0}.pd-model{flex-direction:column;align-items:stretch}.pd-model>b{transform:rotate(90deg);align-self:center}.pd-chain>div{flex-direction:column}.pd-chain b{transform:rotate(90deg)}.pd-diagram{padding:1rem}.pd-downstream{padding:1rem}.pd-lineage>div{grid-template-columns:1fr;gap:.5rem}.pd-kicker{flex-direction:column;gap:.5rem}.pd-hero{padding-top:2rem}.pd-runtime{flex-direction:column}.pd-gate{padding:1rem .5rem}.pd-gate span{font-size:1.65rem}.pastdoor .header-inner{flex-wrap:wrap;gap:1rem}.pd-node span{display:block;transform:rotate(90deg);padding:.5rem}.pd-intro{padding:2rem 0}.pd-equation span{padding:0 .4rem}.pastdoor .brand-wordmark{font-size:1rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.pd-code-evidence{min-width:0;margin:0!important;padding:1rem 1.2rem!important;border:1px solid var(--border-subtle)!important;background:var(--surface-primary)!important}.pd-code-evidence summary{color:var(--text-primary);font:600 .9rem var(--font-interface)}.pd-code-evidence .pd-index{margin:1.2rem 0 .5rem}.pd-code-evidence pre{max-height:34rem;overflow:auto}.pd-code-evidence pre+ .pd-index{margin-top:1.5rem}
.pd-ascii-section{padding-block:1.5rem!important;border-bottom:0}.pd-ascii-section .shell{display:flex;justify-content:center}.pastdoor .pd-ascii-art{box-sizing:border-box;width:max-content;max-width:100%;min-width:0;margin:0;padding:1.5rem 2rem;overflow-x:auto;overflow-wrap:normal;word-break:normal;background:var(--surface-primary);border:1px solid var(--border-subtle);border-radius:12px;box-shadow:none;color:var(--text-primary);font:1rem/1.4 var(--font-system);white-space:pre}.pd-ascii-frame{color:var(--text-muted)}.pd-ascii-gremlin{color:var(--text-muted)}.pd-ascii-history{color:var(--seasonal-amber,#a65300);font-weight:650}.pd-ascii-prose{color:var(--text-primary);font-weight:400}.pd-ascii-provenance{color:var(--text-primary);font-style:italic;font-weight:400}
@media(max-width:800px){.pd-ascii-section{padding-block:1rem!important}.pastdoor .pd-ascii-art{padding:1rem;font-size:clamp(.65rem,2.7vw,1rem)}}