/* MailFixly — Kairos design system (CON-13 'Fault -> Fixed').
   Extracted from the approved reference page by build_run.py. Do not hand-edit:
   change the source page or EXTRA_CSS in build_site.py and rebuild.
   Filename is content-hashed on purpose — see CSS_HREF in build_site.py. */

:root{
  --paper:#fcfcfd; --paper-raised:#f9f9fb; --rule:#e8e8ec; --rule-strong:#d9d9e0;
  --ink:#1c2024; --ink-soft:#60646c; --ink-faint:#8b8d98;
  --fixed:#208368; --fixed-fill:#29a383; --fixed-wash:#e6f7ed; --fixed-edge:#acdec8;
  --fault:#ce2c31; --fault-wash:#feebec; --caution:#ab6400; --caution-wash:#fff7c2;
  --night:#0d1114;
  --s-1:.5rem; --s-2:.75rem; --s-3:1rem; --s-4:1.5rem; --s-5:2rem; --s-6:3rem; --s-7:4.5rem;
  --font-display:'Bricolage Grotesque',Georgia,serif;
  --font-text:'Public Sans','Segoe UI',Arial,sans-serif;
  --dur:.55s; --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-text);
  font-size:17px;line-height:1.7;font-optical-sizing:auto}
h1,h2,h3{font-family:var(--font-display);font-weight:700;letter-spacing:-.02em;line-height:1.15;margin:0}
h3{font-size:1.12rem;margin:var(--s-4) 0 var(--s-2)}
p,ul,ol{margin:0 0 var(--s-3)}
a{color:var(--fixed);text-underline-offset:.16em;text-decoration-thickness:.08em}
a:hover{color:var(--ink)}
code{font-family:ui-monospace,Menlo,monospace;font-size:.9em;background:var(--paper-raised);
  border:1px solid var(--rule);border-radius:4px;padding:.1em .35em}
.skip-link{position:absolute;left:-9999px}
.skip-link:focus{left:1rem;top:1rem;z-index:99;background:var(--ink);color:#fff;padding:.6rem 1rem;border-radius:6px}

/* reading progress: scroll-linked, fixed, cannot shift layout */
.progress{position:fixed;top:0;left:0;height:3px;width:100%;transform-origin:0 50%;
  transform:scaleX(0);background:linear-gradient(90deg,var(--fixed-fill),var(--fixed-edge));z-index:60}

/* Sticky only where the vertical space is cheap. On phones the header would
   permanently eat ~57px of a screen the reader needs for the actual fix, and
   there is no TOC rail there to justify it. */
.masthead{border-bottom:1px solid var(--rule);background:rgba(252,252,253,.9);
  backdrop-filter:blur(10px);z-index:40}
@media(min-width:1060px){.masthead{position:sticky;top:0}}
.mast-in{max-width:74rem;margin:0 auto;padding:var(--s-3) var(--s-4);display:flex;
  align-items:center;justify-content:space-between;gap:var(--s-4)}
.brand{font-family:var(--font-display);font-weight:800;font-size:1.15rem;letter-spacing:-.03em;
  color:var(--ink);text-decoration:none}
.brand span{color:var(--fixed)}
.mast-in nav{display:flex;gap:var(--s-4);font-size:.92rem;font-weight:500}
.mast-in nav a{color:var(--ink-soft);text-decoration:none}
.mast-in nav a:hover{color:var(--fixed)}
@media(max-width:620px){.mast-in nav{display:none}}

/* ---- banner (from option A) -------------------------------------------- */
.hero{position:relative;min-height:clamp(320px,42vw,460px);display:grid;align-items:end;
  background:var(--night);overflow:hidden;isolation:isolate}
/* Settled state is the default, with the zoom running as a one-shot animation.
   If animation never runs the image is simply already in position, so the hero
   can never be left mid-effect. */
.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.55;
  transform:scale(1);z-index:-2}
@media (prefers-reduced-motion: no-preference){
  .hero img{animation:heroSettle 2.4s var(--ease)}
}
@keyframes heroSettle{from{transform:scale(1.07)}}
.hero::after{content:'';position:absolute;inset:0;z-index:-1;
  background:linear-gradient(180deg,rgba(13,17,20,.2) 0%,rgba(13,17,20,.8) 58%,var(--night) 100%)}
.hero-in{max-width:74rem;margin:0 auto;padding:var(--s-7) var(--s-4) var(--s-5);width:100%}
.hero .crumb,.hero .crumb a{color:rgba(255,255,255,.6);font-size:.85rem;text-decoration:none}
.hero .eyebrow{font-size:.76rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--fixed-edge);margin:var(--s-4) 0 0}
.hero h1{color:#fff;font-size:clamp(2.1rem,1.3rem + 3vw,3.6rem);max-width:19ch;margin:var(--s-3) 0 0}
.hero .lede{color:rgba(255,255,255,.82);font-size:1.12rem;max-width:54ch;margin-top:var(--s-3)}
.byline{display:flex;flex-wrap:wrap;gap:var(--s-2) var(--s-3);align-items:center;font-size:.85rem;
  color:rgba(255,255,255,.62);margin-top:var(--s-4)}
.byline a{color:rgba(255,255,255,.92)}
.verified{color:var(--fixed-edge);font-weight:600}

/* ---- triage cards (from option C), richer ------------------------------ */
.triage{max-width:74rem;margin:0 auto;padding:var(--s-6) var(--s-4) 0}
.triage h2{font-size:1.3rem;margin:0 0 var(--s-1)}
.triage .sub{color:var(--ink-soft);font-size:.95rem;margin-bottom:var(--s-4)}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:var(--s-3)}
.card{position:relative;display:block;border:1px solid var(--rule);border-radius:16px;
  padding:var(--s-4);background:var(--paper);text-decoration:none;color:inherit;overflow:hidden;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease)}
.card::before{content:'';position:absolute;inset:0 0 auto;height:3px;
  background:linear-gradient(90deg,var(--fixed-fill),var(--fixed-edge));
  transform:scaleX(0);transform-origin:0 50%;transition:transform .4s var(--ease)}
.card:hover{transform:translateY(-6px);box-shadow:0 16px 36px rgba(15,23,42,.10);border-color:var(--fixed-edge)}
.card:hover::before{transform:scaleX(1)}
/* NOTE: must out-specify `.card span{display:block}` below (class+type beats a
   bare class), otherwise the tile falls back to block and the icon pins
   top-left instead of centring. */
.card .card-ico{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;
  background:var(--fixed-wash);margin-bottom:var(--s-3);transition:background .35s var(--ease)}
.card .card-ico svg{display:block;width:22px;height:22px;stroke:var(--fixed);stroke-width:1.7;
  fill:none;stroke-linecap:round;stroke-linejoin:round;transition:stroke .35s var(--ease)}
.card:hover .card-ico{background:var(--fixed-fill)}
.card:hover .card-ico svg{stroke:#fff}
.card b{display:block;font-family:var(--font-display);font-size:1.02rem;margin-bottom:.3rem}
.card span{font-size:.89rem;color:var(--ink-soft);display:block}
.card em{display:inline-flex;align-items:center;gap:.3rem;margin-top:var(--s-3);font-style:normal;
  font-size:.8rem;font-weight:700;color:var(--fixed)}
.card em::after{content:'\2192';transition:transform .3s var(--ease)}
.card:hover em::after{transform:translateX(4px)}

/* ---- body layout ------------------------------------------------------- */
.layout{max-width:74rem;margin:0 auto;padding:var(--s-5) var(--s-4) var(--s-7);
  display:grid;grid-template-columns:minmax(0,1fr);gap:var(--s-5)}
@media(min-width:1060px){
  /* NOTE: sticky/order must target the grid CHILD (the <aside>), not .toc
     inside it, or the columns silently swap and the article collapses. */
  .layout{grid-template-columns:minmax(0,44rem) 15rem;gap:var(--s-6);justify-content:center}
  .layout > aside{position:sticky;top:5rem;align-self:start}
}
.article{min-width:0}
.toc{font-size:.9rem}
.toc strong{display:block;font-family:var(--font-display);font-size:.74rem;letter-spacing:.09em;
  text-transform:uppercase;color:var(--ink-soft);margin-bottom:var(--s-2)}
.toc ol{list-style:none;margin:0;padding:0;border-left:2px solid var(--rule)}
.toc a{display:block;padding:.45rem 0 .45rem var(--s-3);color:var(--ink-soft);text-decoration:none;
  margin-left:-2px;border-left:2px solid transparent;transition:color .25s,border-color .25s}
.toc a:hover,.toc a.active{color:var(--fixed);border-left-color:var(--fixed-fill)}

/* ---- PREMIUM SECTION TREATMENT ----------------------------------------- */
.article section{position:relative;padding-top:var(--s-6);scroll-margin-top:5rem}
.article section h2{font-size:clamp(1.45rem,1.2rem + .9vw,1.95rem);margin:0 0 var(--s-3);
  padding-top:var(--s-3);position:relative}
/* accent rule that draws in when the section reveals */
.article section h2::before{content:'';position:absolute;top:0;left:0;width:52px;height:3px;
  border-radius:2px;background:linear-gradient(90deg,var(--fixed-fill),var(--fixed-edge));
  transform:scaleX(0);transform-origin:0 50%;transition:transform .6s var(--ease) .1s}
.article section.in h2::before{transform:scaleX(1)}
/* every other section gets a soft tint band so the page has rhythm */
.article section:nth-of-type(even){background:
  linear-gradient(180deg,rgba(249,249,251,0) 0,var(--paper-raised) 4%,var(--paper-raised) 96%,rgba(249,249,251,0) 100%);
  border-radius:20px;padding-inline:var(--s-4);margin-inline:calc(-1 * var(--s-4))}
@media(max-width:600px){.article section:nth-of-type(even){padding-inline:var(--s-3);margin-inline:calc(-1 * var(--s-3))}}

.answer{background:linear-gradient(180deg,#f1fbf6,var(--fixed-wash));
  border:1px solid var(--fixed-edge);border-radius:16px;padding:var(--s-5);margin:var(--s-5) 0;
  box-shadow:0 10px 30px rgba(32,131,104,.07)}
.answer .label{display:inline-flex;align-items:center;gap:.4rem;font-size:.7rem;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;color:#fff;background:var(--fixed);
  padding:.3rem .7rem;border-radius:999px;margin-bottom:var(--s-3)}
.answer p{margin:0;font-size:1.02rem}
.answer-list{margin:var(--s-3) 0 0;padding:0;list-style:none}
.answer-list li{position:relative;padding-left:1.6rem;margin:.6rem 0;font-size:.98rem}
.answer-list li::before{content:'';position:absolute;left:0;top:.6em;width:8px;height:8px;
  border-radius:3px;background:var(--fixed-fill);transform:rotate(45deg)}
.answer-test{margin-top:var(--s-4) !important;padding-top:var(--s-3);
  border-top:1px dashed var(--fixed-edge);font-size:.95rem !important;color:var(--ink-soft)}
.answer-test strong{color:var(--fixed)}
.takeaways{border-left:3px solid var(--fixed-fill);background:var(--paper-raised);
  border-radius:0 12px 12px 0;padding:var(--s-3) var(--s-4);margin:var(--s-4) 0}
.takeaways strong{display:block;font-family:var(--font-display);margin-bottom:var(--s-1)}
.takeaways ul{margin:0;padding-left:1.1rem}
.takeaways li{margin:.25rem 0}

.rail{list-style:none;margin:var(--s-4) 0;padding:0 0 0 var(--s-5);position:relative;--progress:1;counter-reset:step}
.rail.is-animated{--progress:0}
/* z-index matters here: the ol's own pseudo-elements paint AFTER its children,
   so without this the progress line draws straight over the numbered markers. */
.rail::before,.rail::after{content:'';position:absolute;left:12px;top:.55rem;bottom:.55rem;
  width:2px;border-radius:2px;z-index:0}
.rail::before{background:var(--rule-strong)}
.rail::after{background:linear-gradient(180deg,var(--fixed-fill),var(--fixed-edge));
  transform:scaleY(var(--progress));transform-origin:top center;will-change:transform}
.rail.is-animated::after{transition:transform var(--dur) var(--ease)}
.rail li{position:relative;margin:0 0 var(--s-4)}
.rail li:last-child{margin-bottom:0}
.rail li::before{content:counter(step);counter-increment:step;position:absolute;left:-2rem;top:0;
  width:26px;height:26px;border-radius:50%;display:grid;place-items:center;z-index:2;
  font-family:var(--font-display);font-size:.78rem;font-weight:700;line-height:1;
  background:var(--fixed-fill);color:#fff;border:2px solid var(--fixed-fill)}
.rail.is-animated li::before{background:var(--paper);color:var(--ink-soft);border-color:var(--rule-strong);
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease)}
.rail.is-animated li.reached::before{background:var(--fixed-fill);color:#fff;
  border-color:var(--fixed-fill);transform:scale(1.08)}
.rail li strong{display:block;font-family:var(--font-display);font-size:1rem;margin-bottom:.15rem}

.note{border-left:3px solid var(--fixed-fill);background:var(--fixed-wash);border-radius:0 12px 12px 0;padding:var(--s-3) var(--s-4);margin:var(--s-4) 0}
.warn{border-left:3px solid var(--caution);background:var(--caution-wash);border-radius:0 12px 12px 0;padding:var(--s-3) var(--s-4);margin:var(--s-4) 0}
.err{font-family:ui-monospace,Menlo,monospace;font-size:.88rem;color:var(--fault);
  background:var(--fault-wash);border:1px solid #ffdbdc;border-radius:6px;padding:.15em .5em;display:inline-block}
.table-wrap{overflow-x:auto;margin:var(--s-4) 0;border:1px solid var(--rule);border-radius:14px;background:var(--paper)}
table{border-collapse:collapse;width:100%;font-size:.94rem}
th,td{text-align:left;padding:var(--s-3);border-bottom:1px solid var(--rule);vertical-align:top}
th{background:var(--ink);color:#fff;font-family:var(--font-display);font-size:.82rem;letter-spacing:.03em}
th:first-child{border-top-left-radius:13px}th:last-child{border-top-right-radius:13px}
tbody tr{transition:background .2s}
tbody tr:hover{background:var(--fixed-wash)}
tr:last-child td{border-bottom:0}

#faq details{border:1px solid var(--rule);border-radius:12px;margin:var(--s-2) 0;background:var(--paper);
  transition:border-color .25s,box-shadow .25s}
#faq details[open]{border-color:var(--fixed-edge);box-shadow:0 6px 20px rgba(32,131,104,.06)}
#faq summary{cursor:pointer;padding:var(--s-3) var(--s-4);font-weight:600;font-family:var(--font-display);
  font-size:1rem;list-style:none;display:flex;justify-content:space-between;gap:var(--s-3);align-items:center}
#faq summary::-webkit-details-marker{display:none}
#faq summary::after{content:'+';color:var(--fixed);font-size:1.4rem;line-height:1;
  transition:transform .3s var(--ease)}
#faq details[open] summary::after{transform:rotate(45deg)}
#faq .a{padding:0 var(--s-4) var(--s-3);color:var(--ink-soft)}

.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:var(--s-3);margin:var(--s-3) 0}
.related a{position:relative;display:block;border:1px solid var(--rule);border-radius:14px;padding:var(--s-4);
  text-decoration:none;color:inherit;overflow:hidden;
  transition:transform .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease)}
.related a::before{content:'';position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--fixed-fill);
  transform:scaleY(0);transform-origin:50% 0;transition:transform .3s var(--ease)}
.related a:hover{transform:translateY(-4px);border-color:var(--fixed-edge);box-shadow:0 12px 28px rgba(15,23,42,.08)}
.related a:hover::before{transform:scaleY(1)}
.related b{font-family:var(--font-display);display:block;margin-bottom:.2rem}
.related span{font-size:.88rem;color:var(--ink-soft)}

.sources{list-style:none;padding:0;margin:var(--s-3) 0}
.sources li{padding:var(--s-3);border:1px solid var(--rule);border-radius:12px;margin-bottom:var(--s-2);
  background:var(--paper);transition:border-color .25s,transform .25s var(--ease)}
.sources li:hover{border-color:var(--fixed-edge);transform:translateX(4px)}
.sources a{font-weight:600;text-decoration:none}
.sources span{display:block;font-size:.86rem;color:var(--ink-soft);margin-top:.15rem}

.trust{position:relative;border:1px solid var(--fixed-edge);
  background:linear-gradient(180deg,#f4fbf7,var(--paper));border-radius:18px;
  padding:var(--s-5);margin:var(--s-6) 0 0;box-shadow:0 10px 30px rgba(32,131,104,.06)}
.trust::before{content:'\2713';position:absolute;top:-18px;left:var(--s-5);width:36px;height:36px;
  border-radius:50%;background:var(--fixed-fill);color:#fff;display:grid;place-items:center;
  font-size:1.05rem;font-weight:700;box-shadow:0 6px 16px rgba(32,131,104,.28)}
.trust h2{margin:var(--s-2) 0 var(--s-2) !important;font-size:1.15rem;padding-top:0 !important}
.trust h2::before{display:none}
.trust ul{margin:var(--s-2) 0 0;padding-left:1.1rem}
.trust li{margin:.35rem 0}

.tool{border:1px solid var(--rule);border-radius:16px;padding:var(--s-4);margin:var(--s-4) 0;
  background:linear-gradient(180deg,var(--paper),var(--paper-raised))}
.tool h3{margin-top:0}
.tool .muted{font-size:.9rem;color:var(--ink-soft);margin-bottom:var(--s-3)}
.tool-row{display:flex;gap:var(--s-2);flex-wrap:wrap}
.tool input{flex:1;min-width:200px;padding:.75rem .9rem;border:1.5px solid var(--rule-strong);
  border-radius:10px;font:inherit;font-size:.95rem;background:var(--paper);color:var(--ink)}
.tool input:focus{outline:none;border-color:var(--fixed);box-shadow:0 0 0 3px var(--fixed-wash)}
.tool button{border:0;border-radius:10px;padding:0 1.2rem;font:inherit;font-weight:600;
  background:var(--fixed);color:#fff;cursor:pointer;transition:background .25s,transform .2s}
.tool button:hover{background:var(--ink);transform:translateY(-1px)}
.verdict{margin-top:var(--s-3);padding:.8rem 1rem;border-radius:10px;font-size:.94rem;font-weight:600;display:none}
.verdict.ok{display:block;background:var(--fixed-wash);color:var(--fixed);border:1px solid var(--fixed-edge)}
.verdict.no{display:block;background:var(--fault-wash);color:var(--fault);border:1px solid #f4a9aa}
.verdict.hm{display:block;background:var(--caution-wash);color:var(--caution);border:1px solid #e9c162}

figure{margin:var(--s-5) 0}
figcaption{font-size:.86rem;color:var(--ink-soft);margin-top:var(--s-2)}
.diagram{display:block;width:100%;height:auto;border:1px solid var(--rule);border-radius:16px;
  background:var(--paper);padding:var(--s-4);box-shadow:0 6px 20px rgba(15,23,42,.04)}
.d-fault-box{fill:var(--fault-wash);stroke:#f4a9aa}
.d-fault-label{font-family:var(--font-display);font-size:14px;font-weight:700;fill:var(--fault)}
.d-line{stroke:var(--rule-strong);stroke-width:1.5;fill:none}
.d-rule{stroke:var(--rule);stroke-width:1}
.d-axis{stroke:var(--rule-strong);stroke-width:1.2}
.d-track{fill:var(--paper-raised);stroke:var(--rule)}
.d-fill-ok{fill:var(--fixed-wash);stroke:var(--fixed-edge)}
.d-fill-bad{fill:var(--fault-wash);stroke:#f4a9aa}
.d-loop{stroke:var(--fault);stroke-width:1.8;fill:none;stroke-dasharray:4 3}
.d-cause-box{fill:var(--paper);stroke:var(--rule-strong)}
.d-cause-t{font-family:var(--font-display);font-size:11.5px;font-weight:700;fill:var(--ink)}
.d-cause-s{font-family:var(--font-text);font-size:10.5px;fill:var(--ink-soft)}
.d-fix-box{fill:var(--fixed-wash);stroke:var(--fixed-edge)}
.d-fix-t{font-family:var(--font-display);font-size:11.5px;font-weight:700;fill:var(--fixed)}
.d-note{font-family:var(--font-display);font-size:11px;font-weight:700;fill:var(--ink-soft);letter-spacing:.05em;text-transform:uppercase}
.d-test-box{fill:var(--paper);stroke:var(--fixed-edge);stroke-dasharray:4 3}
.d-test-t{font-family:var(--font-display);font-size:12px;font-weight:700;fill:var(--ink)}
.d-test-s{font-family:var(--font-text);font-size:10px;fill:var(--ink-soft)}
.d-foot{font-family:var(--font-text);font-size:10.5px;fill:var(--ink-soft)}
.d-broken{stroke:var(--fault);stroke-dasharray:5 4}
.d-fault-small{font-family:var(--font-text);font-size:11px;font-weight:600;fill:var(--fault)}
.d-lock-bar{fill:var(--fault-wash);stroke:#f4a9aa}
.d-retry-t{font-family:var(--font-text);font-size:10px;fill:var(--fault)}
.d-branch{transition:opacity var(--dur) var(--ease)}
.diagram:hover .d-branch{opacity:.35}
.diagram:hover .d-branch:hover{opacity:1}
.d-branch:hover .d-cause-box{fill:#fff;stroke:var(--fixed)}
.d-branch:hover .d-drop{stroke:var(--fixed-fill);stroke-width:2.5}
.d-branch:hover .d-fix-box{fill:var(--fixed-fill);stroke:var(--fixed-fill)}
.d-branch:hover .d-fix-t{fill:#fff}
@media(hover:none){.diagram:hover .d-branch{opacity:1}}

.ad{margin:var(--s-6) 0;min-height:280px;display:grid;place-items:center;gap:.35rem;
  border:1px dashed var(--rule-strong);border-radius:16px;background:var(--paper-raised);
  text-align:center;padding:var(--s-3)}
.ad::before{content:'Advertisement';font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft)}
.ad::after{content:'Slot reserved. Awaiting MailFixly AdSense unit IDs.';font-size:.78rem;color:var(--ink-soft);max-width:26ch}

.site-foot{border-top:1px solid var(--rule);background:var(--night);color:rgba(255,255,255,.72);margin-top:var(--s-7)}
.site-foot .mast-in{display:block;padding-block:var(--s-5);font-size:.88rem}
.site-foot .brand{color:#fff}
.site-foot a{color:rgba(255,255,255,.86)}
.foot-note{margin-top:var(--s-3);color:rgba(255,255,255,.55);font-size:.82rem}

/* Entrance reveal is for BELOW-the-fold content only. The hero deliberately
   carries no .rv: it holds the LCP element, and anything above the fold must
   never depend on an animation completing in order to become visible. */
.js .rv{opacity:0;transform:translateY(16px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .rv.in{opacity:1;transform:none}
.hero{opacity:1}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1 !important;transform:none !important;transition:none !important}
  .article section h2::before{transform:scaleX(1) !important;transition:none !important}
  .progress{display:none}
  .rail,.rail.is-animated{--progress:1}
  .rail::after,.rail.is-animated::after{transition:none !important}
  .rail.is-animated li::before{transition:none !important;background:var(--fixed-fill);color:#fff;
    border-color:var(--fixed-fill);transform:none}
  .diagram:hover .d-branch{opacity:1}
  *{animation-duration:.01ms !important;transition-duration:.01ms !important}
}

/* ======================================================================
   SITE SHELL — components beyond the article template
   ====================================================================== */

/* Masthead nav needs a mobile fallback. The article template simply hid the
   nav under 620px because it had a TOC rail; a content page has no such
   escape hatch, so hiding it would strand the reader with no navigation. */
@media(max-width:620px){
  .mast-in{flex-wrap:wrap;gap:var(--s-2)}
  .mast-in nav{display:flex;width:100%;gap:var(--s-3);font-size:.85rem;
    overflow-x:auto;padding-bottom:2px;-webkit-overflow-scrolling:touch}
  .mast-in nav::-webkit-scrollbar{display:none}
  .mast-in nav a{white-space:nowrap}
}

/* ---- page hero: lighter than the article's full-bleed image band -------- */
.phero{position:relative;background:var(--night);overflow:hidden;isolation:isolate}
.phero::before{content:'';position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(60rem 30rem at 12% -10%,rgba(41,163,131,.20),transparent 60%),
    radial-gradient(40rem 24rem at 88% 0%,rgba(32,131,104,.14),transparent 62%)}
.phero-in{max-width:74rem;margin:0 auto;padding:var(--s-7) var(--s-4) var(--s-6);width:100%}
.phero .crumb,.phero .crumb a{color:rgba(255,255,255,.6);font-size:.85rem;text-decoration:none}
.phero .crumb a:hover{color:#fff}
.phero .eyebrow{font-size:.76rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--fixed-edge);margin:var(--s-4) 0 0}
.phero h1{color:#fff;font-size:clamp(2rem,1.3rem + 2.6vw,3.2rem);max-width:22ch;margin:var(--s-3) 0 0}
.phero .lede{color:rgba(255,255,255,.82);font-size:1.1rem;max-width:58ch;margin-top:var(--s-3)}
.phero .meta{display:flex;flex-wrap:wrap;gap:var(--s-2) var(--s-3);align-items:center;
  font-size:.85rem;color:rgba(255,255,255,.6);margin-top:var(--s-4)}

/* ---- HOME: hero is the LCP surface, so it animates via keyframes only --- */
.hhero{position:relative;background:var(--night);overflow:hidden;isolation:isolate}
.hhero::before{content:'';position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(70rem 34rem at 8% -14%,rgba(41,163,131,.26),transparent 58%),
    radial-gradient(46rem 26rem at 92% 4%,rgba(32,131,104,.16),transparent 60%)}
/* Hairline grid. Pure CSS, no request, and it reads as "engineered" rather
   than decorative — appropriate for a diagnostics site. */
.hhero::after{content:'';position:absolute;inset:0;z-index:-1;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(60rem 30rem at 30% 0%,#000,transparent 75%);
  mask-image:radial-gradient(60rem 30rem at 30% 0%,#000,transparent 75%)}
.hhero-in{max-width:74rem;margin:0 auto;padding:clamp(3.5rem,7vw,6rem) var(--s-4) clamp(3rem,6vw,5rem)}
.hhero .tag{display:inline-flex;align-items:center;gap:.5rem;font-size:.76rem;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;color:var(--fixed-edge);
  border:1px solid rgba(172,222,200,.28);background:rgba(41,163,131,.10);
  padding:.42rem .85rem;border-radius:999px}
.hhero .tag::before{content:'';width:7px;height:7px;border-radius:50%;background:var(--fixed-fill);
  box-shadow:0 0 0 0 rgba(41,163,131,.6)}
@media (prefers-reduced-motion: no-preference){
  .hhero .tag::before{animation:pulse 2.6s var(--ease) infinite}
}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(41,163,131,.55)}70%{box-shadow:0 0 0 9px rgba(41,163,131,0)}100%{box-shadow:0 0 0 0 rgba(41,163,131,0)}}
.hhero h1{color:#fff;font-size:clamp(2.4rem,1.4rem + 4vw,4.2rem);max-width:17ch;
  margin:var(--s-4) 0 0;letter-spacing:-.035em}
.hhero h1 .hl{position:relative;color:var(--fixed-edge);white-space:nowrap}
.hhero h1 .hl::after{content:'';position:absolute;left:0;right:0;bottom:.06em;height:.10em;
  border-radius:2px;background:linear-gradient(90deg,var(--fixed-fill),transparent);
  transform:scaleX(0);transform-origin:0 50%}
@media (prefers-reduced-motion: no-preference){
  .hhero h1 .hl::after{animation:swipe .9s var(--ease) .45s forwards}
}
@media (prefers-reduced-motion: reduce){.hhero h1 .hl::after{transform:scaleX(1)}}
@keyframes swipe{to{transform:scaleX(1)}}
.hhero .lede{color:rgba(255,255,255,.80);font-size:clamp(1.05rem,1rem + .3vw,1.22rem);
  max-width:56ch;margin-top:var(--s-4)}
.hcta{display:flex;flex-wrap:wrap;gap:var(--s-3);margin-top:var(--s-5)}
.btn{display:inline-flex;align-items:center;gap:.55rem;font-weight:600;font-size:.98rem;
  text-decoration:none;border-radius:12px;padding:.85rem 1.4rem;
  transition:transform .28s var(--ease),background .28s var(--ease),box-shadow .28s var(--ease)}
.btn-p{background:var(--fixed-fill);color:#062;color:#04281f;box-shadow:0 10px 26px rgba(41,163,131,.28)}
.btn-p:hover{background:#fff;color:var(--night);transform:translateY(-2px)}
.btn-s{border:1px solid rgba(255,255,255,.24);color:#fff}
.btn-s:hover{border-color:var(--fixed-edge);background:rgba(255,255,255,.06);transform:translateY(-2px)}
.btn svg{width:17px;height:17px;stroke:currentColor;stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round}

/* stat strip under the hero */
.hstats{display:grid;grid-template-columns:repeat(auto-fit,minmax(11rem,1fr));gap:var(--s-3);
  margin-top:clamp(2.5rem,5vw,3.5rem);padding-top:var(--s-5);
  border-top:1px solid rgba(255,255,255,.10)}
.hstat b{display:block;font-family:var(--font-display);font-size:1.5rem;color:#fff;letter-spacing:-.02em}
.hstat span{display:block;font-size:.85rem;color:rgba(255,255,255,.55);margin-top:.15rem}

/* ---- generic section wrapper for content pages ------------------------- */
.band{max-width:74rem;margin:0 auto;padding:clamp(3rem,6vw,4.5rem) var(--s-4) 0}
.band.tight{padding-top:clamp(2rem,4vw,3rem)}
.band-head{max-width:52ch;margin-bottom:var(--s-5)}
.band-head .eyebrow{font-size:.74rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;
  color:var(--fixed);margin:0 0 var(--s-2)}
.band-head h2{font-size:clamp(1.6rem,1.25rem + 1.2vw,2.3rem);margin:0 0 var(--s-2)}
.band-head p{color:var(--ink-soft);margin:0}

/* ---- guide index cards ------------------------------------------------- */
.guides{display:grid;grid-template-columns:repeat(auto-fit,minmax(19rem,1fr));gap:var(--s-4)}
.guide{position:relative;display:flex;flex-direction:column;border:1px solid var(--rule);
  border-radius:18px;overflow:hidden;background:var(--paper);text-decoration:none;color:inherit;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease)}
.guide:hover{transform:translateY(-6px);border-color:var(--fixed-edge);
  box-shadow:0 18px 40px rgba(15,23,42,.10)}
.guide-img{position:relative;aspect-ratio:1200/630;background:var(--night);overflow:hidden}
.guide-img img{width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .6s var(--ease)}
.guide:hover .guide-img img{transform:scale(1.04)}
.guide-body{padding:var(--s-4);display:flex;flex-direction:column;flex:1}
.guide .kicker{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--fixed);margin-bottom:var(--s-2)}
.guide b{font-family:var(--font-display);font-size:1.18rem;line-height:1.25;display:block;
  margin-bottom:var(--s-2);letter-spacing:-.01em}
.guide p{font-size:.92rem;color:var(--ink-soft);margin:0 0 var(--s-3)}
.guide .foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;
  gap:var(--s-2);font-size:.8rem;color:var(--ink-faint);
  padding-top:var(--s-3);border-top:1px solid var(--rule)}
.guide .go{display:inline-flex;align-items:center;gap:.35rem;font-weight:700;color:var(--fixed)}
.guide .go::after{content:'\2192';transition:transform .3s var(--ease)}
.guide:hover .go::after{transform:translateX(4px)}

/* ---- "how we work" value props ----------------------------------------- */
.props{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:var(--s-4)}
.prop{border:1px solid var(--rule);border-radius:16px;padding:var(--s-4);background:var(--paper);
  transition:border-color .3s var(--ease),transform .3s var(--ease)}
.prop:hover{border-color:var(--fixed-edge);transform:translateY(-4px)}
.prop-ico{display:grid;place-items:center;width:40px;height:40px;border-radius:11px;
  background:var(--fixed-wash);margin-bottom:var(--s-3)}
.prop-ico svg{width:21px;height:21px;stroke:var(--fixed);stroke-width:1.7;fill:none;
  stroke-linecap:round;stroke-linejoin:round;display:block}
.prop b{display:block;font-family:var(--font-display);font-size:1.02rem;margin-bottom:.3rem}
.prop p{font-size:.9rem;color:var(--ink-soft);margin:0}

/* ---- prose pages (legal, about, editorial) ----------------------------- */
.prose{max-width:44rem;margin:0 auto;padding:var(--s-6) var(--s-4) var(--s-7)}
.prose h2{font-size:clamp(1.35rem,1.15rem + .7vw,1.7rem);margin:var(--s-6) 0 var(--s-3);
  padding-top:var(--s-3);position:relative}
.prose h2::before{content:'';position:absolute;top:0;left:0;width:46px;height:3px;border-radius:2px;
  background:linear-gradient(90deg,var(--fixed-fill),var(--fixed-edge))}
.prose h2:first-of-type{margin-top:0}
.prose h3{font-size:1.05rem;margin:var(--s-4) 0 var(--s-2)}
.prose ul,.prose ol{padding-left:1.2rem}
.prose li{margin:.35rem 0}
.prose dl{margin:var(--s-3) 0}
.prose dt{font-weight:700;font-family:var(--font-display);margin-top:var(--s-3)}
.prose dd{margin:.2rem 0 0;color:var(--ink-soft)}
.prose .updated{font-size:.88rem;color:var(--ink-soft);padding:var(--s-3) var(--s-4);
  background:var(--paper-raised);border:1px solid var(--rule);border-radius:12px;margin-bottom:var(--s-5)}

/* legal contents box */
.contents{border:1px solid var(--rule);border-radius:14px;padding:var(--s-4);background:var(--paper-raised);
  margin-bottom:var(--s-5)}
.contents strong{display:block;font-family:var(--font-display);font-size:.74rem;letter-spacing:.09em;
  text-transform:uppercase;color:var(--ink-soft);margin-bottom:var(--s-2)}
.contents ol{margin:0;padding-left:1.2rem;font-size:.94rem;columns:2;column-gap:var(--s-4)}
@media(max-width:560px){.contents ol{columns:1}}
.contents a{text-decoration:none}
.contents a:hover{text-decoration:underline}

/* ---- contact ----------------------------------------------------------- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(16rem,1fr));gap:var(--s-4);
  margin:var(--s-5) 0}
.ccard{border:1px solid var(--rule);border-radius:16px;padding:var(--s-4);background:var(--paper);
  transition:border-color .3s var(--ease),transform .3s var(--ease)}
.ccard:hover{border-color:var(--fixed-edge);transform:translateY(-4px)}
.ccard b{display:block;font-family:var(--font-display);font-size:1.02rem;margin-bottom:.3rem}
.ccard p{font-size:.92rem;color:var(--ink-soft);margin:0 0 var(--s-3)}
.ccard a.mail{display:inline-block;font-weight:600;word-break:break-all}
.ccard .when{font-size:.82rem;color:var(--ink-faint);margin-top:var(--s-2)}

/* ---- CTA band ---------------------------------------------------------- */
.cta{max-width:74rem;margin:clamp(3rem,6vw,4.5rem) auto 0;padding:0 var(--s-4)}
.cta-in{position:relative;overflow:hidden;border-radius:22px;background:var(--night);
  padding:clamp(2.2rem,5vw,3.4rem);text-align:center;isolation:isolate}
.cta-in::before{content:'';position:absolute;inset:0;z-index:-1;
  background:radial-gradient(40rem 20rem at 50% 0%,rgba(41,163,131,.22),transparent 65%)}
.cta-in h2{color:#fff;font-size:clamp(1.5rem,1.2rem + 1.2vw,2.1rem);margin:0 0 var(--s-2)}
.cta-in p{color:rgba(255,255,255,.74);max-width:48ch;margin:0 auto var(--s-4)}

/* ---- dark-surface link hover fix --------------------------------------
   The base sheet has `a:hover{color:var(--ink)}` (0,1,1). That is a LIGHT-surface rule:
   --ink is #1c2024, which on the --night bands is black text on a black background, so the
   label vanishes on hover. It outranks `.btn-s{color:#fff}` (0,1,0) because a pseudo-class
   counts toward specificity, which is why the button loses its text and not its border.

   Every link sitting on --night therefore needs an explicit hover colour at (0,2,0) or above.
   Fixing them individually rather than weakening the global rule: the article page shares this
   stylesheet and relies on the light-surface behaviour everywhere else.

   Deliberately NOT written as `.hhero a:hover` — that is (0,2,1) and would also capture
   .btn-p, whose hover inverts to a white fill and genuinely needs dark text. */
.btn-s:hover{color:#fff}
.site-foot a:hover{color:var(--fixed-edge)}
.hero .crumb a:hover,.phero .crumb a:hover{color:#fff}
.byline a:hover{color:#fff}

/* footer needs real columns once there are policy pages to link */
.foot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(12rem,1fr));gap:var(--s-5);
  margin-top:var(--s-5)}
.foot-col strong{display:block;font-family:var(--font-display);font-size:.74rem;letter-spacing:.09em;
  text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:var(--s-2)}
.foot-col a{display:block;padding:.22rem 0;text-decoration:none;font-size:.9rem}
.foot-col a:hover{color:var(--fixed-edge)}
.foot-bar{margin-top:var(--s-5);padding-top:var(--s-4);border-top:1px solid rgba(255,255,255,.10)}