/* Treadstone article page — hybrid layout (feature hero + sticky TOC & rail) */
.progress{position:fixed;top:0;left:0;height:3px;background:var(--tsl-crimson);width:0;z-index:200;transition:width .1s linear}
.fhero{position:relative;min-height:440px;display:flex;align-items:flex-end;overflow:hidden;background:var(--tsl-navy)}
.fhero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.fhero .grad{position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,16,40,.45),rgba(20,16,40,.62) 45%,rgba(20,16,40,.95))}
.fhero .wrap{position:relative;z-index:2;max-width:1180px;margin:0 auto;padding:90px 40px 50px;color:#fff;width:100%}
.fhero .crumb-light{font-size:12.5px;color:rgba(255,255,255,.72);margin-bottom:18px;letter-spacing:.04em}
.fhero .crumb-light a{color:#fff;border-bottom:1px solid rgba(255,255,255,.4)}
.fhero .crumb-light i{font-style:normal;color:var(--tsl-gold-soft);padding:0 6px}
.fhero .art-eyebrow{display:inline-flex;align-items:center;gap:12px;font-size:11.5px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--tsl-gold-soft);margin-bottom:18px}
.fhero .art-eyebrow .no{font-family:var(--font-display);font-style:italic;color:#fff}
.fhero h1{font-family:var(--font-display);font-weight:300;font-size:clamp(34px,4.8vw,56px);line-height:1.07;letter-spacing:-.028em;margin-bottom:16px;max-width:20ch;text-shadow:0 2px 28px rgba(12,9,22,.55)}
.fhero .dek{font-size:18px;color:rgba(255,255,255,.9);max-width:62ch;line-height:1.55;margin-bottom:20px;text-shadow:0 1px 14px rgba(12,9,22,.5)}
.fhero .art-meta{display:flex;align-items:center;gap:16px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.82)}
.fhero .av{width:34px;height:34px;border-radius:50%;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:11px;margin-right:8px;vertical-align:middle}
.fhero .sep{width:4px;height:4px;border-radius:50%;background:var(--tsl-gold);display:inline-block}

.rwrap{max-width:1180px;margin:0 auto;padding:52px 40px 0;display:grid;grid-template-columns:212px 1fr 250px;gap:48px;align-items:start}
.toc{position:sticky;top:96px}
.toc-toggle{display:none}
.toc h4{font-size:11px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--tsl-gold);margin-bottom:16px}
.toc a{display:block;font-size:13.5px;color:var(--tsl-ink-soft);padding:8px 0 8px 14px;border-left:2px solid var(--tsl-line);line-height:1.4;transition:all .18s}
.toc a:hover{color:var(--tsl-ink)}
.toc a.on{color:var(--tsl-crimson);border-left-color:var(--tsl-crimson);font-weight:600}

.rbody{font-size:17.5px;line-height:1.78;color:#312b24;min-width:0}
.back-link{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--tsl-crimson);background:var(--tsl-surface);border:1px solid var(--tsl-line);border-radius:100px;padding:8px 16px;margin-bottom:26px;transition:all .18s}
.back-link span{transition:transform .2s}
.back-link:hover{background:#fff;border-color:var(--tsl-crimson)}
.back-link:hover span{transform:translateX(-3px)}
.rbody>p:first-of-type::first-letter{font-family:var(--font-display);font-weight:300;float:left;font-size:74px;line-height:.72;padding:8px 13px 0 0;color:var(--tsl-crimson)}
.rbody h2{font-family:var(--font-display);font-weight:500;font-size:28px;letter-spacing:-.018em;margin:42px 0 14px;color:var(--tsl-ink);scroll-margin-top:90px}
.rbody h2:first-of-type{margin-top:6px}
.rbody h3{font-family:var(--font-display);font-weight:500;font-size:20px;margin:26px 0 8px;color:var(--tsl-ink)}
.rbody p{margin-bottom:18px}
.rbody strong{color:var(--tsl-ink);font-weight:600}
.rbody a{color:var(--tsl-crimson);border-bottom:1px solid var(--tsl-gold-soft)}
.rbody ul,.rbody ol{margin:0 0 18px 22px;display:flex;flex-direction:column;gap:9px}
.rbody li{padding-left:4px}
.rbody li::marker{color:var(--tsl-gold)}
.rbody blockquote{border-left:3px solid var(--tsl-gold);background:var(--tsl-surface);border-radius:0 10px 10px 0;padding:14px 20px;margin:20px 0;color:var(--tsl-ink-soft)}
.rbody blockquote p{margin:0}
.rbody table{width:100%;border-collapse:collapse;margin:22px 0;font-size:14.5px}
.rbody th{text-align:left;font-weight:600;color:var(--tsl-ink);background:var(--tsl-surface);padding:11px 13px;border-bottom:2px solid var(--tsl-line-2)}
.rbody td{padding:11px 13px;border-bottom:1px solid var(--tsl-line);color:var(--tsl-ink-soft);vertical-align:top}
.rbody tr:last-child td{border-bottom:none}
.faq{margin-top:6px}
.faq details{border:1px solid var(--tsl-line-2);border-radius:12px;padding:18px 22px;margin-bottom:11px;background:#fff}
.faq details[open]{border-color:var(--tsl-gold)}
.faq summary{font-weight:600;font-size:16px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;color:var(--tsl-ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--font-display);font-weight:300;font-size:24px;color:var(--tsl-gold);line-height:1}
.faq details[open] summary::after{content:"\2013";color:var(--tsl-crimson)}
.faq details p{margin:12px 0 0;font-size:15px;color:var(--tsl-ink-soft)}
.faq details ul{margin-top:10px}
.disclaimer{font-size:13.5px;color:var(--tsl-ink-soft);background:var(--tsl-surface-2);border:1px solid var(--tsl-line);border-radius:12px;padding:20px 24px;margin:34px 0 0;line-height:1.6}
.disclaimer strong{color:var(--tsl-ink)}
.art-foot-nav{display:flex;justify-content:space-between;gap:16px;padding:34px 0 60px;border-top:1px solid var(--tsl-line);margin-top:34px}
.art-foot-nav a{font-size:14px;color:var(--tsl-ink-soft);font-weight:500;max-width:46%}
.art-foot-nav a:hover{color:var(--tsl-crimson)}
.art-foot-nav .lbl{display:block;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--tsl-gold);margin-bottom:4px}
.rail{position:sticky;top:96px;display:flex;flex-direction:column;gap:16px}
.rail-cta{background:var(--tsl-navy);border-radius:14px;padding:24px;color:#fff;position:relative;overflow:hidden}
.rail-cta::after{content:"";position:absolute;right:-50px;bottom:-60px;width:170px;height:170px;background:radial-gradient(circle,rgba(169,133,60,.22),transparent 64%)}
.rail-cta .seal{width:42px;height:42px;color:var(--tsl-gold-soft);margin-bottom:12px;position:relative;z-index:1}
.rail-cta h4{font-family:var(--font-display);font-weight:500;font-size:18px;margin-bottom:7px;position:relative;z-index:1}
.rail-cta p{font-size:13px;color:rgba(255,255,255,.74);margin-bottom:16px;line-height:1.5;position:relative;z-index:1}
.rail-cta .btn{width:100%;position:relative;z-index:1}
.rail-related{background:#fff;border:1px solid var(--tsl-line-2);border-radius:14px;padding:22px}
.rail-related h4{font-size:11px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--tsl-gold);margin-bottom:14px}
.rail-related a{display:block;font-size:14px;color:var(--tsl-ink);font-weight:500;line-height:1.4;padding:11px 0;border-top:1px solid var(--tsl-line);transition:color .18s}
.rail-related a:first-of-type{border-top:none}
.rail-related a:hover{color:var(--tsl-crimson)}
.rail-related a span{display:block;font-size:11px;color:var(--tsl-ink-soft);font-weight:400;margin-top:2px}
@media(max-width:980px){
  .rwrap{grid-template-columns:1fr;gap:26px;padding-top:32px}
  .toc{position:static;order:1;background:var(--tsl-surface);border:1px solid var(--tsl-line);border-radius:12px;padding:0;overflow:hidden}
  .toc h4{display:none}
  .toc-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;background:none;border:none;font-family:var(--font-body);font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--tsl-ink);padding:15px 18px;cursor:pointer}
  .toc-toggle i{width:11px;height:11px;border-right:2px solid var(--tsl-crimson);border-bottom:2px solid var(--tsl-crimson);transform:rotate(45deg);transition:transform .22s;margin-top:-4px}
  .toc.open .toc-toggle i{transform:rotate(-135deg);margin-top:2px}
  .toc-list{display:none;padding:0 18px 14px}
  .toc.open .toc-list{display:block}
  .toc a{border-left:2px solid var(--tsl-line);padding:9px 0 9px 14px}
  .rbody{order:2}
  .rail{position:static;order:3}
  .rbody table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;white-space:nowrap}
}
@media(max-width:600px){
  .fhero{min-height:auto;align-items:flex-start}
  .fhero .wrap{padding:60px 20px 34px}
  .fhero h1{font-size:clamp(28px,8vw,40px)}
  .fhero .dek{font-size:16px}
  .rwrap{padding:26px 20px 0}
  .rbody{font-size:16.5px;line-height:1.72}
  .rbody>p:first-of-type::first-letter{font-size:58px;padding:6px 10px 0 0}
  .rbody h2{font-size:24px;margin:34px 0 12px}
  .art-foot-nav{flex-direction:column;gap:14px}
  .art-foot-nav a{max-width:100%}
  .back-link{margin-bottom:20px}
}

/* ==== Sprint AX (F6/F9): template evolution ==== */
/* A — key takeaways (gold docs-style TL;DR after the dek) */
.takeaways{background:#fff;border:1.5px solid var(--tsl-gold);border-radius:var(--radius);padding:22px 24px;margin:0 0 30px;position:relative}
.takeaways .tk-label{display:flex;align-items:center;gap:8px;font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:#8a6a28;margin-bottom:13px}
.takeaways .tk-label svg{width:14px;height:14px}
.takeaways ul{list-style:none;display:flex;flex-direction:column;gap:11px;margin:0;padding:0}
.takeaways li{display:flex;gap:11px;font-size:14.5px;line-height:1.55;color:var(--tsl-ink)}
.takeaways li::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--tsl-gold);margin-top:8px}
/* B — meta pill row (hero) */
.fhero .art-pills{gap:10px}
.fhero .art-pills .pill{display:inline-flex;align-items:center;gap:7px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.24);border-radius:100px;padding:6px 13px;font-size:12.5px;color:rgba(255,255,255,.92);font-variant-numeric:tabular-nums;transition:background var(--dur-fast) var(--ease-out)}
.fhero .art-pills .pill:hover{background:rgba(255,255,255,.2)}
.fhero .art-pills .pill-area{background:var(--tsl-crimson);border-color:var(--tsl-crimson);font-weight:600;color:#fff}
.fhero .art-pills .pill-area:hover{background:var(--tsl-crimson-deep)}
.fhero .art-pills .av{width:22px;height:22px;font-size:8.5px;margin-right:0}
/* C — deterministic hero-art hue/tone variants (slug-hash keyed) */
.fhero img.art-h1{filter:hue-rotate(12deg) saturate(1.08) brightness(1.03)}
.fhero img.art-h2{filter:hue-rotate(-14deg) saturate(.92) brightness(.97)}
/* E — end-of-article contextual CTA band */
.art-endband{display:flex;align-items:center;justify-content:space-between;gap:22px;flex-wrap:wrap;background:var(--tsl-surface);border:1px solid var(--border-strong);border-radius:12px;padding:26px 28px;margin:34px 0 8px}
.art-endband h4{font-family:var(--font-display);font-weight:400;font-size:20px;letter-spacing:-.01em;margin:0 0 6px}
.art-endband p{font-size:13.5px;color:var(--text-muted);margin:0;max-width:52ch}
.art-endband .eb-acts{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.art-endband .eb-quiet{font-size:13px;font-weight:600;color:var(--tsl-crimson);white-space:nowrap}
.art-endband .eb-quiet:hover{text-decoration:underline}
/* F — pager directional nudge (180ms) */
.art-foot-nav a .lbl{display:inline-block;transition:transform var(--dur-fast) var(--ease-out)}
.art-foot-nav a:first-child:hover .lbl{transform:translateX(-3px)}
.art-foot-nav a:last-child:hover .lbl{transform:translateX(3px)}
/* F9 — LTT calculator embed shell (filled by ltt-calc.js; empty without JS) */
.ltt-embed{margin:30px 0}

/* ==== Sprint AY (F4): phone tap floor for the FAQ accordions ==== */
@media(max-width:600px){
  .faq summary{min-height:44px;align-items:center}
}