/* LeadArc article layout. Built from coss ui tokens (coss.com/ui): neutral palette, 1px hairlines,
   rounded-lg buttons, rounded-2xl cards, rounded-sm badges, text-sm tables, muted foreground #737373. */
.at, .at *, .at *::before, .at *::after{ box-sizing:border-box; }
.at{ --fg:#171717; --body:#404040; --muted:#737373; --line:rgba(0,0,0,.08); --muted-bg:#f5f5f5; --card:#fff;
  --disp:"CS Display","CS UI",ui-sans-serif,system-ui,sans-serif; --ui:"CS UI",ui-sans-serif,system-ui,sans-serif;
  font-family:var(--ui); color:var(--body); }
.at-sec{ border-top:1px solid var(--ds-hair,rgba(0,0,0,.06)); }
.at-shell{ max-width:1200px; margin:0 auto; padding:0 24px; }
/* header */
body{ margin:0; background:var(--ds-bg,#fcfcfc); }
.at-crumbs{ padding-top:40px !important; }
.at-grid{ display:grid; grid-template-columns:220px minmax(0,1fr); grid-template-rows:auto 1fr; gap:0 56px; padding:28px 0 72px; }
.at-grid > .at-toc{ grid-column:1; grid-row:1 / span 2; }
.at-head{ grid-column:2; grid-row:1; padding:0 0 8px; }
.at-grid > .at-prose{ grid-column:2; grid-row:2; }
.at-head-in{ max-width:760px; }
.at-tags{ display:flex; flex-wrap:wrap; gap:8px; align-items:center; margin:18px 0 0; }
.at-tags .at-badge{ height:28px; padding:0 10px; font-size:13px; border-radius:8px; }
.at-chip{ display:inline-flex; align-items:center; gap:6px; height:28px; padding:0 10px; border-radius:8px; border:1px solid var(--line); background:#fff; color:var(--fg); font-size:13px; font-weight:500; text-decoration:none; box-shadow:0 1px 2px rgba(0,0,0,.04); }
.at-chip:hover{ background:#f5f5f5; }
.at-chip svg{ width:15px; height:15px; flex:none; display:block; }
.at-prose mark.hl, mark.hl{ background:#fef3c7; color:#92400e; padding:0 4px; border-radius:4px; font-weight:500; }
.at-crumbs{ display:flex; flex-wrap:wrap; gap:6px; align-items:center; margin:0; padding:0; list-style:none; font-size:13px; color:var(--muted); }
.at-crumbs a{ color:var(--muted); text-decoration:none; } .at-crumbs a:hover{ color:var(--fg); }
.at-crumbs li+li::before{ content:"/"; margin-right:6px; opacity:.5; }
.at-badge{ display:inline-flex; align-items:center; height:22px; padding:0 7px; border-radius:6px; border:1px solid var(--line); background:#fff; color:var(--fg); font-size:12px; font-weight:500; }
.at-badge--muted{ background:var(--muted-bg); border-color:transparent; color:var(--muted); }
.at-badge--ok{ background:rgba(16,185,129,.08); border-color:transparent; color:#047857; }
.at-badge--warn{ background:rgba(245,158,11,.1); border-color:transparent; color:#b45309; }
.at-h1{ margin:0; color:var(--fg); font-family:var(--disp); font-weight:600; font-size:clamp(2rem,4vw,2.75rem); line-height:1.1; letter-spacing:-.022em; text-wrap:balance; }
.at-dek{ margin:16px 0 0; font-size:18px; line-height:1.55; color:var(--muted); text-wrap:pretty; }
.at-meta{ display:flex; flex-wrap:wrap; gap:8px; align-items:center; margin:20px 0 0; font-size:13px; color:var(--muted); }
.at-meta .dot{ opacity:.5; }
.at-cover{ display:block; max-width:760px; margin:28px 0 0; aspect-ratio:16/9; overflow:hidden; border-radius:16px; border:1px solid var(--line); background:#f4f4f5; }
.at-cover img{ display:block; width:100%; height:100%; object-fit:cover; }
/* body grid: TOC left, prose right. The aside stretches the full grid height so the sticky nav stops at the bottom. */
.at-toc{ align-self:stretch; }
.at-toc-in{ position:sticky; top:calc(var(--hdr-h,116px) + 24px); padding-top:6px; }
.at-toc-label{ margin:0 0 10px; font-size:12px; font-weight:500; color:var(--muted); }
.at-toc ol{ list-style:none; margin:0; padding:0; border-left:1px solid var(--line); }
.at-toc li a{ display:block; margin-left:-1px; padding:5px 0 5px 12px; border-left:1px solid transparent; font-size:13.5px; line-height:1.4; color:var(--muted); text-decoration:none; transition:color .15s,border-color .15s; }
.at-toc li.l3 a{ padding-left:24px; font-size:13px; }
.at-toc li a:hover{ color:var(--fg); }
.at-toc li a[aria-current="true"]{ color:var(--fg); border-left-color:var(--fg); font-weight:500; }
.at-toc-m{ display:none; }
/* prose */
.at-prose{ max-width:760px; min-width:0; font-size:16.5px; line-height:1.7; }
.at-prose h2{ margin:56px 0 0; color:var(--fg); font-family:var(--disp); font-weight:600; font-size:28px; line-height:1.2; letter-spacing:-.018em; scroll-margin-top:calc(var(--hdr-h,116px) + 24px); }
.at-prose h3{ margin:32px 0 0; color:var(--fg); font-family:var(--disp); font-weight:600; font-size:20px; line-height:1.3; letter-spacing:-.01em; scroll-margin-top:calc(var(--hdr-h,116px) + 24px); }
.at-prose > h2:first-child{ margin-top:24px; }
.at-prose p{ margin:16px 0 0; }
.at-prose ul, .at-prose ol{ margin:16px 0 0; padding-left:22px; } .at-prose li{ margin:6px 0 0; }
.at-prose a{ color:var(--fg); text-underline-offset:3px; }
.at-prose strong{ color:var(--fg); font-weight:600; }
.at-prose blockquote{ margin:28px 0 0; padding:2px 0 2px 20px; border-left:2px solid var(--fg); color:var(--fg); font-size:18px; line-height:1.55; }
.at-prose blockquote p{ margin:0; } .at-prose blockquote cite{ display:block; margin-top:8px; font-size:13px; font-style:normal; color:var(--muted); }
.at-fig{ margin:32px 0 0; }
.at-fig-frame{ aspect-ratio:16/9; overflow:hidden; border-radius:16px; border:1px solid var(--line); background:#f4f4f5; }
.at-fig-frame img, .at-fig-frame iframe{ display:block; width:100%; height:100%; border:0; object-fit:cover; }
.at-fig figcaption, .at-table-cap{ margin-top:10px; font-size:13px; line-height:1.5; color:var(--muted); }
.at-video-ph{ position:relative; display:flex; flex-direction:column; gap:12px; align-items:center; justify-content:center; height:100%; background:#18181b; color:#a1a1aa; font-size:13px; }
.at-video-ph .play{ display:flex; align-items:center; justify-content:center; width:56px; height:56px; border-radius:999px; background:rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.14); }
.at-video-ph .play svg{ width:20px; height:20px; fill:#fafafa; margin-left:3px; }
/* coss ui Table, default variant: text-sm, muted head, row hairlines */
.at-table{ position:relative; width:100%; overflow-x:auto; margin:28px 0 0; -webkit-overflow-scrolling:touch; }
.at-table table{ width:100%; min-width:560px; border-collapse:collapse; font-size:14px; line-height:1.45; }
.at-table caption{ caption-side:bottom; text-align:left; margin-top:10px; font-size:13px; color:var(--muted); }
.at-table th{ height:40px; padding:0 8px; text-align:left; font-weight:500; color:var(--muted); white-space:nowrap; border-bottom:1px solid var(--line); }
.at-table tbody th{ padding:10px 8px; text-align:left; font-weight:500; color:var(--fg); border-bottom:1px solid var(--line); }
.at-table td{ padding:10px 8px; color:var(--fg); border-bottom:1px solid var(--line); vertical-align:middle; }
.at-table tbody tr:last-child :is(td,th){ border-bottom:0; }
.at-table tbody tr:hover td{ background:rgba(0,0,0,.02); }
.at-table .num{ text-align:right; font-variant-numeric:tabular-nums; }
/* coss ui CardFrame + Table variant="card": muted frame, separate white card body with rounded-xl corners */
.at-frame{ margin:28px 0 0; border:1px solid var(--line); border-radius:16px; background:var(--muted-bg); box-shadow:0 1px 2px rgba(0,0,0,.05); }
.at-frame-head{ display:grid; grid-template-columns:1fr auto; gap:2px 16px; padding:14px 20px; }
.at-frame-title{ font-size:14px; font-weight:600; color:var(--fg); } .at-frame-desc{ font-size:13px; color:var(--muted); }
.at-frame-head .at-badge{ grid-column:2; grid-row:1 / span 2; align-self:center; }
.at-frame .at-table{ margin:0; overflow-x:auto; padding:0 0 0; }
.at-frame table{ border-collapse:separate; border-spacing:0; }
.at-frame thead th{ border-bottom:0; padding:0 16px; }
.at-frame tbody :is(td,th){ background:var(--card); padding:12px 16px; border-bottom:1px solid var(--line); }
.at-frame tbody :is(td,th):first-child{ border-left:1px solid var(--line); }
.at-frame tbody :is(td,th):last-child{ border-right:1px solid var(--line); }
.at-frame tbody tr:first-child :is(td,th){ border-top:1px solid var(--line); }
.at-frame tbody tr:first-child :is(td,th):first-child{ border-top-left-radius:12px; } .at-frame tbody tr:first-child :is(td,th):last-child{ border-top-right-radius:12px; }
.at-frame tbody tr:last-child :is(td,th){ border-bottom:1px solid var(--line); }
.at-frame tbody tr:last-child :is(td,th):first-child{ border-bottom-left-radius:12px; } .at-frame tbody tr:last-child :is(td,th):last-child{ border-bottom-right-radius:12px; }
.at-frame tbody tr:hover :is(td,th){ background:#fbfbfb; }
.at-frame .at-table{ margin:0 -1px -1px; width:calc(100% + 2px); }
.at-frame caption{ padding:0 20px 12px; margin:0; caption-side:top; }
.at-frame td.us{ font-weight:600; }
.at-frame th.us{ color:var(--fg); }
/* CTA banner: coss ui Card shape on zinc #18181b (footer colour) */
.at-cta{ position:relative; overflow:hidden; isolation:isolate; display:flex; align-items:center; min-height:0; margin:48px 0 0; padding:28px 32px; border-radius:16px; background:#18181b; border:1px solid rgba(255,255,255,.08); box-shadow:inset 0 1px 0 rgba(255,255,255,.06), 0 1px 2px rgba(0,0,0,.08); color:#fafafa; }
.at-cta-copy{ position:relative; z-index:1; max-width:62%; }
.at-cta .at-cta-title{ margin:0; font-family:var(--disp); font-weight:600; font-size:22px; line-height:1.2; letter-spacing:-.015em; color:#fafafa; }
.at-cta .at-cta-sub{ margin:8px 0 0; font-size:14.5px; line-height:1.5; color:#a1a1aa; }
.at-cta .at-cta-btn{ margin-top:18px; background:#2a2a2e; color:#fafafa; border-color:rgba(255,255,255,.12); box-shadow:inset 0 1px 0 rgba(255,255,255,.12), 0 1px 2px rgba(0,0,0,.3); text-decoration:none; }
.at-cta .at-cta-btn:hover{ background:#323236; } .at-cta .at-cta-btn svg{ opacity:.5; }
.at-cta-mark{ position:absolute; right:-28px; top:50%; transform:translateY(-50%); width:260px; height:auto; z-index:0; pointer-events:none; overflow:visible; }
.at-cta-mark path{ fill:none; stroke:#fff; stroke-opacity:.16; stroke-width:1; vector-effect:non-scaling-stroke; stroke-linejoin:round; }
.at-end{ margin-top:56px; }
/* responsive */
@media (max-width:1000px){
  .at-grid{ grid-template-columns:minmax(0,1fr); } .at-head, .at-grid > .at-prose{ grid-column:1; } .at-head-in{ max-width:none; }
  .at-toc{ display:none; }
  .at-prose{ max-width:none; }
  .at-toc-m{ display:block; margin:16px 0 0; border:1px solid var(--line); border-radius:12px; background:#fff; }
  .at-toc-m summary{ display:flex; justify-content:space-between; align-items:center; padding:12px 16px; font-size:14px; font-weight:500; color:var(--fg); cursor:pointer; list-style:none; }
  .at-toc-m summary::-webkit-details-marker{ display:none; }
  .at-toc-m summary::after{ content:""; width:8px; height:8px; border-right:1.5px solid var(--muted); border-bottom:1.5px solid var(--muted); transform:rotate(45deg); transition:transform .15s; }
  .at-toc-m[open] summary::after{ transform:rotate(-135deg); }
  .at-toc-m ol{ list-style:none; margin:0; padding:0 16px 12px; }
  .at-toc-m li a{ display:block; padding:6px 0; font-size:14px; color:var(--muted); text-decoration:none; }
  .at-toc-m li.l3 a{ padding-left:14px; }
}
@media (max-width:640px){
  .at-shell{ padding:0 18px; }
  .at-crumbs{ padding-top:28px !important; } .at-grid{ padding-top:20px; }
  .at-dek{ font-size:16.5px; }
  .at-prose h2{ font-size:24px; margin-top:44px; }
  .at-cta{ padding:24px 20px; }
  .at-cta-copy{ max-width:none; }
  .at-cta-mark{ right:-90px; width:220px; } .at-cta-mark path{ stroke-opacity:.1; }
}

.at-sr{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }
.at a.at-badge{ text-decoration:none; }
.at-badge--link:hover{ background:#f5f5f5; }
@media (max-width:1000px){ .at-cover{ max-width:none; } }
.at-cover picture{ display:block; width:100%; height:100%; }
.at-prose .pb-prose{ margin-top:16px; }
/* ---- Content components (coss ui Card / Badge primitives) ---- */
/* Email script card */
.at-scripts{ display:grid; gap:12px; margin:28px 0 0; }
.at-prose > .at-script{ margin-top:24px; }
.at-prose .at-script, .at-script{ position:relative; margin:0; padding:18px 20px 18px 52px; border:1px solid var(--line); border-radius:12px; background:#fff; box-shadow:0 1px 2px rgba(0,0,0,.05); color:var(--fg); font-size:15.5px; line-height:1.6; }
.at-script::before{ content:""; position:absolute; left:18px; top:20px; width:18px; height:18px; opacity:.45;
  background:no-repeat center/18px url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23171717' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='2' y='4' width='20' height='16' rx='2'/%3E%3Cpath d='m22 7-10 6L2 7'/%3E%3C/svg%3E"); }
.at-prose .at-script p{ margin:0; } .at-prose .at-script p+p{ margin-top:10px; }
/* Metric cards (stats) and step cards (flow) */
.at-metrics{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:12px; margin:28px 0 0; padding:0; list-style:none; }
.at-prose .at-metrics li, .at-metric{ margin:0; padding:16px 18px; border:1px solid var(--line); border-radius:12px; background:#fff; box-shadow:0 1px 2px rgba(0,0,0,.05); display:flex; flex-direction:column; gap:4px; }
.at-metric dt, .at-metric .lbl{ order:2; font-size:13px; line-height:1.4; color:var(--muted); font-weight:400; }
.at-metric dd, .at-metric .val{ order:1; margin:0; font-family:var(--disp); font-weight:600; font-size:26px; line-height:1.1; letter-spacing:-.015em; color:var(--fg); }
.at-steps{ counter-reset:step; }
.at-steps .at-metric{ position:relative; }
.at-steps .at-metric::after{ counter-increment:step; content:counter(step); position:absolute; top:12px; right:12px; display:inline-flex; align-items:center; justify-content:center; min-width:20px; height:20px; padding:0 5px; border-radius:6px; background:var(--muted-bg); color:var(--muted); font-size:11.5px; font-weight:500; }
/* Up/down checklist (offer levers) */
.at-levers{ display:grid; gap:8px; margin:24px 0 0; padding:0; list-style:none; }
.at-prose .at-levers li{ margin:0; display:flex; align-items:center; gap:10px; padding:10px 14px; border:1px solid var(--line); border-radius:10px; background:#fff; color:var(--fg); font-size:15px; }
.at-levers .at-badge{ min-width:24px; justify-content:center; font-size:13px; }
.at-skip{ position:fixed; top:8px; left:16px; z-index:100002; transform:translateY(-160%); padding:10px 16px; border-radius:10px; background:#fff; border:1px solid var(--line, rgba(0,0,0,.08)); }
.at-skip:focus{ transform:none; }
.at-prose .at-levers, .at-prose .at-metrics{ padding-left:0; }