/*
  TalkXO Case Studies — base
  Reset, fonts, document typography, page chrome (nav/footer),
  layout primitives. Load after tokens.css.
*/
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:var(--blue);color:var(--paper)}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
ul,ol{list-style:none}

.wrap{max-width:1180px;margin:0 auto;padding:0 clamp(20px,4vw,56px)}
.wrap-doc{max-width:840px;margin:0 auto;padding:0 clamp(20px,4vw,56px)}

/* faint paper grain — same recipe as the main site, kept subtle */
body::after{
  content:"";position:fixed;inset:-50%;pointer-events:none;z-index:9999;opacity:.4;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain 9s steps(6) infinite;
}
@keyframes grain{
  0%,100%{transform:translate(0,0)}16%{transform:translate(-2%,1%)}33%{transform:translate(1%,-2%)}
  50%{transform:translate(-1%,2%)}66%{transform:translate(2%,1%)}83%{transform:translate(-2%,-1%)}
}

#progress{position:fixed;top:0;left:0;height:2px;width:0;background:var(--blue);z-index:1000}

.label{
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink-60);font-weight:500;
}

/* ============ NAV ============ */
nav.site-nav{position:fixed;top:0;left:0;right:0;z-index:200;border-bottom:1px solid transparent;transition:.4s}
nav.site-nav.scrolled{background:rgba(241,237,228,.88);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom-color:var(--hair)}
.nav-in{
  max-width:1180px;margin:0 auto;padding:18px clamp(20px,4vw,56px);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
}
/* Whatever immediately follows the wordmark gets pushed flush against whatever comes
   after it (nav-links, or a case-menu dropdown when nav-links isn't present, or nothing
   at all) — keeps the right-hand cluster grouped together no matter how many items
   follow, unlike a positional nth-last-child rule which breaks when the item count changes. */
.wordmark + *{margin-left:auto}
.wordmark{font-family:var(--mono);font-size:13px;font-weight:500;letter-spacing:.08em;display:flex;align-items:center;gap:10px}
.wordmark .sq{width:9px;height:9px;background:var(--blue);display:inline-block}
.wordmark em{font-style:normal;color:var(--ink-40)}
.nav-links{display:flex;gap:28px;font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase}
.nav-links a{position:relative;padding:4px 0;color:var(--ink-60);transition:color .25s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:0;background:var(--blue);transition:width .3s}
.nav-links a:hover,.nav-links a.on{color:var(--ink)}
.nav-links a:hover::after,.nav-links a.on::after{width:100%}
.nav-cta{
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;
  border:1px solid var(--ink);padding:8px 16px;transition:.25s;white-space:nowrap;
}
.nav-cta:hover{background:var(--ink);color:var(--paper)}
@media(max-width:840px){.nav-links{display:none}}

/* ============ DOC HEADER (cover) ============ */
.doc-header{padding:calc(84px + clamp(40px,8vh,96px)) 0 clamp(40px,6vh,64px)}
.doc-eyebrow{display:flex;align-items:center;gap:10px;margin-bottom:22px}
.doc-eyebrow .sq{width:7px;height:7px;background:var(--blue)}
.doc-title{
  font-size:clamp(34px,5.4vw,64px);font-weight:900;letter-spacing:-.03em;line-height:1.02;
  text-transform:uppercase;max-width:16ch;
}
.doc-title .serif{ color:var(--blue); }
.doc-dek{
  margin-top:22px;font-size:clamp(16px,1.6vw,20px);line-height:1.6;color:var(--ink-60);
  font-weight:500;max-width:56ch;
}
.doc-meta{
  margin-top:40px;padding-top:24px;border-top:1px solid var(--hair);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:20px 28px;
}
.doc-meta dt{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-40);margin-bottom:6px}
.doc-meta dd{font-size:14.5px;font-weight:700;letter-spacing:-.01em}

/* ============ DOCUMENT BODY TYPOGRAPHY ============ */
.doc-section{padding:clamp(56px,8vh,96px) 0}
.doc-section + .doc-section{border-top:1px solid var(--hair)}
.label.doc-kicker{
  display:block;margin-bottom:16px;font-size:13px;font-weight:700;letter-spacing:.06em;color:var(--ink);
}
.doc-h2{
  font-size:clamp(28px,3.6vw,44px);font-weight:900;letter-spacing:-.025em;line-height:1.04;
  text-transform:uppercase;max-width:20ch;margin-bottom:20px;
}
.doc-h2 .serif{color:var(--blue)}
.doc-h3{font-size:clamp(19px,2vw,24px);font-weight:700;letter-spacing:-.015em;margin:34px 0 12px}
.doc-p{font-size:15.5px;line-height:1.75;color:var(--ink-60);font-weight:500;max-width:var(--measure)}
.doc-p + .doc-p{margin-top:16px}
.doc-p b,.doc-p strong{color:var(--ink);font-weight:700}
.doc-lede{font-size:clamp(18px,2vw,22px);line-height:1.6;font-weight:500;color:var(--ink);max-width:var(--measure)}
.doc-list{max-width:var(--measure)}
.doc-list li{
  position:relative;padding-left:26px;font-size:15px;line-height:1.7;color:var(--ink-60);font-weight:500;
}
.doc-list li + li{margin-top:10px}
.doc-list li::before{content:"";position:absolute;left:0;top:9px;width:10px;height:1.5px;background:var(--blue)}
.doc-list li b{color:var(--ink);font-weight:700}

blockquote.pull{
  margin:36px 0;padding:28px 0 28px 28px;border-left:2px solid var(--blue);
  font-family:var(--serif);font-style:italic;font-size:clamp(21px,2.6vw,28px);
  line-height:1.4;color:var(--ink);max-width:52ch;
}
blockquote.pull cite{
  display:block;margin-top:14px;font-family:var(--mono);font-style:normal;font-size:11px;
  letter-spacing:.1em;text-transform:uppercase;color:var(--ink-40);
}

hr.rule{border:none;border-top:1px solid var(--hair);margin:40px 0}

/* footnote / source citation */
.doc-note{
  font-family:var(--mono);font-size:11.5px;line-height:1.7;color:var(--ink-40);
  max-width:var(--measure);
}

/* ============ SECTION HEAD (module title with meta) ============ */
.sec-head{
  display:flex;justify-content:space-between;align-items:baseline;gap:24px;
  border-bottom:1px solid var(--ink);padding-bottom:16px;flex-wrap:wrap;margin-bottom:36px;
}
.sec-head h2{font-size:clamp(26px,3.4vw,42px);font-weight:900;text-transform:uppercase;letter-spacing:-.025em;line-height:1}
.sec-head h2 .serif{color:var(--blue)}

/* ============ CTA ============ */
.cta{border-top:1px solid var(--ink);padding:clamp(50px,8vh,90px) 0}
.cta-in{display:flex;justify-content:space-between;align-items:center;gap:40px;flex-wrap:wrap}
.cta h2{font-size:clamp(26px,3.4vw,46px);font-weight:900;text-transform:uppercase;letter-spacing:-.025em;line-height:1.02}
.cta h2 .serif{color:var(--blue)}
.cta-sub{margin-top:12px;max-width:440px;font-size:14px;line-height:1.65;color:var(--ink-60);font-weight:500}
.cta-side{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.cta .note{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-40)}

/* magnetic-style button (static here; add motion per-page if wanted) */
.mag{
  display:inline-flex;align-items:center;gap:14px;
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;font-weight:500;
  background:var(--ink);color:var(--paper);padding:18px 30px;border:none;cursor:pointer;
  transition:background .3s,color .3s;
}
.mag:hover{background:var(--blue);color:#fff}
.mag .arr{transition:transform .3s cubic-bezier(.34,1.56,.64,1);display:inline-block}
.mag:hover .arr{transform:translateX(5px)}
.mag.ghost{background:transparent;color:var(--ink);border:1px solid var(--ink)}
.mag.ghost:hover{background:var(--ink);color:var(--paper)}

/* ============ FOOTER ============ */
footer.site-foot{background:var(--paper);color:var(--ink);border-top:1px solid var(--hair)}
.foot{
  display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;
  padding-top:26px;padding-bottom:26px;
}
.foot .wordmark em{color:var(--ink-40)}
.foot-links{display:flex;gap:24px;flex-wrap:wrap;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase}
.foot-links a{color:var(--ink-60);transition:color .25s}
.foot-links a:hover{color:var(--ink)}
.foot .fine{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-40)}
.foot-right{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.foot-right a{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-60);transition:color .25s}
.foot-right a:hover{color:var(--ink)}

/* ============ REVEAL ============ */
.rv{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.08s}.rv.d2{transition-delay:.16s}.rv.d3{transition-delay:.24s}

@media(max-width:840px){
  .doc-meta{grid-template-columns:repeat(2,1fr)}
  .cta-in{flex-direction:column;align-items:flex-start}
}