/* The lineage: one dated thread from a published argument to a proposed
   pilot, shown the same way on five pages. Each page marks its own step.
   Markup is generated by scripts/lineage.py. */
.thr{container-type:inline-size;margin:0;color:var(--ink,#28333F);font-family:var(--font-body,"Inter",system-ui,sans-serif)}
.thr .thr-in{background:var(--white,#fff);border:1px solid var(--hairline,var(--line,#DCE3EA));border-radius:14px;padding:26px 28px 24px;box-shadow:var(--sh-xs,0 1px 2px rgba(28,46,74,.05))}
.thr .thr-k{font-family:var(--font-mono,"IBM Plex Mono",monospace);font-size:11px;font-weight:600;letter-spacing:.15em;text-transform:uppercase;color:var(--coral,#F26D5A);margin:0 0 8px}
.thr .thr-h{font-family:var(--font-display,"Spectral",Georgia,serif);font-weight:600;font-size:1.35rem;line-height:1.25;color:var(--heading,#1C2E4A);margin:0 0 6px;letter-spacing:-.005em}
.thr .thr-lead{font-size:.95rem;line-height:1.55;color:var(--muted,#65717E);margin:0 0 22px;max-width:70ch}
.thr ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(6,1fr);gap:0 16px;position:relative}
.thr ol::before{content:"";position:absolute;left:10px;right:10px;top:9px;height:2px;background:var(--hairline,var(--line,#DCE3EA));border-radius:2px}
.thr li{position:relative;padding-top:22px;min-width:0}
.thr li::before{content:"";position:absolute;left:0;top:2px;width:16px;height:16px;border-radius:50%;background:var(--white,#fff);border:2px solid var(--muted,#65717E);box-sizing:border-box;transition:transform .35s var(--ease,cubic-bezier(.2,.6,.2,1)),border-color .35s}
.thr li.done::before{background:var(--navy,#1C2E4A);border-color:var(--navy,#1C2E4A)}
.thr li.here::before{background:var(--coral,#F26D5A);border-color:var(--coral,#F26D5A);box-shadow:0 0 0 5px var(--coral-wash,#FDEEEA)}
.thr li.next::before{border-style:dashed;border-color:var(--coral,#F26D5A)}
.thr li.then::before{border-style:dotted;border-color:var(--muted,#65717E);background:transparent}
.thr li.then .thr-t,.thr li.then .thr-m{color:var(--muted,#65717E)}
.thr li.then .thr-t{font-weight:400}
.thr li.then .thr-t a:hover,.thr li.then .thr-t a:focus-visible{color:var(--coral,#F26D5A)}
.thr .thr-v{font-family:var(--font-mono,"IBM Plex Mono",monospace);font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--muted,#65717E);display:flex;align-items:center;gap:8px;margin:0 0 7px}
.thr li.here .thr-v{color:var(--coral,#F26D5A)}
.thr .thr-v .thr-this{white-space:nowrap;font-weight:600;letter-spacing:.08em;text-transform:none;color:var(--coral,#F26D5A);background:var(--coral-wash,#FDEEEA);border-radius:999px;padding:2px 8px;font-size:10.5px}
.thr .thr-t{font-family:var(--font-display,"Spectral",Georgia,serif);font-size:.98rem;line-height:1.3;color:var(--heading,#1C2E4A);margin:0 0 6px;font-weight:600}
.thr .thr-t a{color:inherit;text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s,color .2s}
.thr .thr-t a:hover,.thr .thr-t a:focus-visible{color:var(--coral,#F26D5A);border-bottom-color:currentColor}
.thr .thr-m{font-size:.84rem;line-height:1.5;color:var(--muted,#65717E);margin:0}
.thr .thr-m a{color:inherit;text-decoration:none;border-bottom:1px solid currentColor}
.thr .thr-m a:hover,.thr .thr-m a:focus-visible{color:var(--coral,#F26D5A)}
.thr .thr-m b{font-weight:600;color:var(--ink,#28333F)}
.thr .thr-f{margin:20px 0 0;padding-top:14px;border-top:1px solid var(--hairline,var(--line,#DCE3EA));font-size:.82rem;line-height:1.5;color:var(--muted,#65717E);display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:space-between}
.thr .thr-f a{color:var(--coral,#F26D5A);text-decoration:none;border-bottom:1px solid rgba(242,109,90,.4)}
.thr .thr-f a:hover{border-bottom-color:currentColor}
/* narrow containers (article column, phones): one column, line down the left */
@container (max-width:860px){
  .thr ol{grid-template-columns:1fr;gap:18px 0}
  .thr ol::before{left:7px;right:auto;top:10px;bottom:10px;width:2px;height:auto}
  .thr li{padding:0 0 0 34px}
  .thr li::before{top:3px}
  .thr .thr-in{padding:22px 20px 20px}
}
@media (max-width:720px){
  .thr ol{grid-template-columns:1fr;gap:18px 0}
  .thr ol::before{left:7px;right:auto;top:10px;bottom:10px;width:2px;height:auto}
  .thr li{padding:0 0 0 34px}
  .thr li::before{top:3px}
  .thr .thr-in{padding:22px 20px 20px}
}
/* page placements */
section.thr-band{padding:0 0 clamp(2rem,4vw,3.25rem)}
section.thr-band.thr-top{padding-top:clamp(2rem,4vw,3.25rem)}
.thr.thr-article{margin:30px 0 0}
/* entrance: steps light up in order once seen (JS adds .in) */
html.thr-js .thr li{opacity:0;transform:translateY(8px);transition:opacity .5s var(--ease,cubic-bezier(.2,.6,.2,1)),transform .5s var(--ease,cubic-bezier(.2,.6,.2,1))}
html.thr-js .thr.in li{opacity:1;transform:none}
html.thr-js .thr.in li:nth-child(2){transition-delay:.08s}
html.thr-js .thr.in li:nth-child(3){transition-delay:.16s}
html.thr-js .thr.in li:nth-child(4){transition-delay:.24s}
html.thr-js .thr.in li:nth-child(5){transition-delay:.32s}
html.thr-js .thr.in li:nth-child(6){transition-delay:.4s}
@media (prefers-reduced-motion:reduce){html.thr-js .thr li{opacity:1;transform:none;transition:none}}
/* dark theme */
:root[data-theme="dark"] .thr li.here::before{box-shadow:0 0 0 5px rgba(242,109,90,.22)}
:root[data-theme="dark"] .thr .thr-v .thr-this{white-space:nowrap;background:rgba(242,109,90,.18)}