/* =========================================================
   jCypher · Concept 03 "Atlas"
   Editorial, composed, enterprise-grade — serif + hairlines
   ========================================================= */
:root{
  --paper:#FBFCFE;
  --panel:#EFF4FB;
  --ink:#101B33;
  --slate:#44536F;
  --muted:#6B7A94;
  --royal:#1E40AF;
  --royal-soft:#3B5BDB;
  --navy:#0F1E45;
  --hair:#D8E0EE;
  --hair-dark:rgba(180,200,240,.22);
  --font-serif:'Fraunces',Georgia,serif;
  --font-sans:'Public Sans',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',monospace;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:var(--font-sans);
  background:var(--paper);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
.container{max-width:1140px;margin:0 auto;padding:0 28px}
a{color:inherit}
:focus-visible{outline:2px solid var(--royal);outline-offset:3px}

h1,h2,h3{font-family:var(--font-serif);line-height:1.12;letter-spacing:-.015em}
h2{font-size:clamp(1.8rem,3.6vw,2.6rem);font-weight:600}
h1 em,h2 em{font-style:italic;color:var(--royal)}
.section-navy h2 em{color:#8FB0FF}

/* ---------- masthead ---------- */
.mast{
  position:sticky;top:0;z-index:50;
  background:rgba(251,252,254,.92);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  border-bottom:1.5px solid var(--ink);
}
.mast-inner{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{
  font-family:var(--font-serif);font-weight:700;font-size:1.35rem;
  text-decoration:none;letter-spacing:-.02em;
}
.brand-dot{color:var(--royal)}
.mast-links{display:flex;align-items:center;gap:30px}
.mast-links a{
  text-decoration:none;font-size:.9rem;font-weight:500;color:var(--slate);
  transition:color .2s;
}
.mast-links a:hover{color:var(--royal)}
.mast-cta{
  color:var(--royal) !important;font-weight:600 !important;
  border-bottom:2px solid var(--royal);padding-bottom:2px;
}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);margin:5px 0;transition:transform .3s,opacity .3s}

/* ---------- hero ---------- */
.hero{padding:84px 0 0}
.hero-grid{
  display:grid;grid-template-columns:1.5fr 1fr;gap:70px;align-items:start;
  padding-bottom:64px;
}
.over{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);margin-bottom:26px;
}
.hero h1{
  font-size:clamp(2.6rem,5.6vw,4.3rem);font-weight:600;margin-bottom:26px;
}
.lede{font-size:1.12rem;color:var(--slate);max-width:56ch;margin-bottom:36px}
.hero-actions{display:flex;align-items:center;gap:28px;flex-wrap:wrap}

.btn-solid{
  display:inline-block;text-decoration:none;cursor:pointer;
  background:var(--royal);color:#fff;font-weight:600;font-size:.95rem;
  padding:.9rem 1.9rem;border:1.5px solid var(--royal);border-radius:3px;
  transition:background .25s,transform .25s,box-shadow .25s;
  font-family:var(--font-sans);
}
.btn-solid:hover{background:#16308a;transform:translateY(-2px);box-shadow:0 12px 26px rgba(30,64,175,.28)}
.btn-text{
  text-decoration:none;font-weight:600;font-size:.95rem;color:var(--ink);
  border-bottom:2px solid var(--hair);padding-bottom:3px;transition:border-color .25s,color .25s;
}
.btn-text:hover{color:var(--royal);border-color:var(--royal)}

/* facts column */
.hero-facts{
  border-left:1.5px solid var(--ink);
  display:grid;gap:0;
}
.fact{padding:20px 0 20px 28px;border-bottom:1px solid var(--hair)}
.fact:last-child{border-bottom:0}
.fact-num{
  display:block;font-family:var(--font-serif);font-weight:700;
  font-size:2.1rem;color:var(--royal);line-height:1.1;
}
.fact-label{font-size:.85rem;color:var(--muted)}

.hero-rule{
  display:flex;align-items:baseline;gap:26px;flex-wrap:wrap;
  border-top:1.5px solid var(--ink);
  padding:18px 0 56px;
}
.hero-rule > span{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);
}
.hero-clients{font-family:var(--font-serif);font-size:1.05rem;color:var(--slate);font-weight:600}

/* ---------- sections ---------- */
.section{padding:92px 0}
.section-paper{background:var(--panel)}
.section-navy{background:var(--navy);color:#E8EEFC}

.sec-head{
  display:grid;grid-template-columns:90px 1fr;gap:26px;align-items:start;
  margin-bottom:50px;padding-top:22px;border-top:1.5px solid var(--ink);
}
.section-navy .sec-head{border-top-color:rgba(232,238,252,.7)}
.sec-no{
  font-family:var(--font-serif);font-style:italic;font-weight:500;
  font-size:1.7rem;color:var(--royal);
}
.sec-no.light{color:#8FB0FF;display:block;margin-bottom:14px;font-family:var(--font-serif);font-style:italic;font-size:1.7rem}
.sec-head p{color:var(--muted);margin-top:10px;max-width:52ch}

/* ---------- capability ledger ---------- */
.ledger{border-top:1px solid var(--hair)}
.entry{border-bottom:1px solid var(--hair)}
.entry summary{
  list-style:none;cursor:pointer;
  display:grid;grid-template-columns:64px 1fr auto 40px;gap:18px;align-items:center;
  padding:24px 4px;transition:background .25s,padding-left .25s;
}
.entry summary::-webkit-details-marker{display:none}
.entry summary:hover{background:#F2F6FD;padding-left:14px}
.e-num{font-family:var(--font-mono);font-size:.82rem;color:var(--royal)}
.e-name{font-family:var(--font-serif);font-size:clamp(1.1rem,2.2vw,1.5rem);font-weight:600}
.e-tag{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;
  color:var(--muted);text-transform:uppercase;
}
.e-mark{
  font-family:var(--font-serif);font-size:1.5rem;color:var(--royal);
  text-align:center;transition:transform .3s;
}
.entry[open] .e-mark{transform:rotate(45deg)}
.e-body{padding:0 4px 26px 82px;max-width:70ch}
.e-body p{color:var(--slate)}

/* ---------- firm ---------- */
.firm-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:70px;align-items:start}
.firm-points{display:grid;grid-template-columns:1fr 1fr;gap:0}
.point{padding:26px 26px 26px 0;border-bottom:1px solid var(--hair-dark)}
.point:nth-child(odd){border-right:1px solid var(--hair-dark);padding-right:26px}
.point:nth-child(even){padding-left:26px}
.point:nth-last-child(-n+2){border-bottom:0}
.point h3{font-size:1.15rem;margin-bottom:8px;color:#fff}
.point p{font-size:.92rem;color:#A9B8DA}

/* ---------- method ---------- */
.method{
  list-style:none;counter-reset:m;
  display:grid;grid-template-columns:repeat(3,1fr);gap:0;
  border-left:1px solid var(--hair);border-top:1px solid var(--hair);
}
.method li{
  padding:30px 28px;border-right:1px solid var(--hair);border-bottom:1px solid var(--hair);
  transition:background .3s;
}
.method li:hover{background:#F2F6FD}
.m-stage{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--royal);
}
.method h3{font-size:1.2rem;margin:10px 0 8px}
.method p{font-size:.92rem;color:var(--slate)}

/* ---------- letters ---------- */
.letters{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.letter{
  background:var(--paper);border:1px solid var(--hair);border-top:3px solid var(--royal);
  padding:32px 28px;display:flex;flex-direction:column;gap:24px;
  transition:transform .3s,box-shadow .3s;
}
.letter:hover{transform:translateY(-5px);box-shadow:0 20px 44px rgba(16,27,51,.1)}
.letter blockquote{
  font-family:var(--font-serif);font-size:1.06rem;line-height:1.6;font-weight:500;
}
.letter figcaption{margin-top:auto;border-top:1px solid var(--hair);padding-top:16px}
.letter strong{display:block;font-size:.95rem}
.letter span{font-size:.82rem;color:var(--muted)}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:70px;align-items:start}
.contact-lede{color:#A9B8DA;margin:18px 0 30px;max-width:44ch}
.contact-details{display:grid;gap:8px}
.contact-details a{
  color:#E8EEFC;text-decoration:none;font-family:var(--font-serif);font-size:1.15rem;
  border-bottom:1px solid rgba(143,176,255,.4);width:fit-content;transition:color .2s,border-color .2s;
}
.contact-details a:hover{color:#8FB0FF;border-color:#8FB0FF}
.contact-form{display:grid;gap:18px}
.contact-form label{display:grid;gap:8px;font-size:.85rem;font-weight:600;color:#C4D1EC}
.contact-form input,.contact-form textarea{
  font:inherit;font-size:.95rem;color:#fff;
  background:rgba(232,238,252,.06);border:1px solid rgba(168,190,235,.3);
  border-radius:3px;padding:.8rem 1rem;resize:vertical;
}
.contact-form input:focus,.contact-form textarea:focus{
  outline:none;border-color:#8FB0FF;box-shadow:0 0 0 3px rgba(143,176,255,.18);
}
.btn-light{background:#fff;color:var(--navy);border-color:#fff;justify-self:start}
.btn-light:hover{background:#DCE6FA;box-shadow:0 12px 26px rgba(0,0,0,.3)}

/* ---------- footer ---------- */
.footer{border-top:1.5px solid var(--ink);padding:26px 0;background:var(--paper)}
.footer-inner{
  display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;
  font-size:.83rem;color:var(--muted);
}
.footer .brand{font-size:1.1rem}

/* ---------- concept switcher ---------- */
.switcher{
  position:fixed;bottom:22px;right:22px;z-index:60;
  display:flex;gap:6px;padding:6px;
  background:var(--navy);border-radius:999px;
  box-shadow:0 12px 32px rgba(15,30,69,.4);
}
.switcher a{
  width:36px;height:36px;border-radius:50%;display:grid;place-items:center;
  color:#A9B8DA;text-decoration:none;font-weight:600;font-size:.85rem;
  transition:background .2s,color .2s;
}
.switcher a:hover{background:rgba(143,176,255,.2);color:#fff}
.switcher a.active{background:var(--royal);color:#fff}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .75s cubic-bezier(.2,.7,.2,1),transform .75s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s !important;transition-duration:.001s !important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .hero-facts{
    border-left:0;border-top:1.5px solid var(--ink);
    grid-template-columns:repeat(4,1fr);
  }
  .fact{padding:20px 12px 0 0;border-bottom:0}
  .firm-grid,.contact-grid{grid-template-columns:1fr;gap:44px}
  .method{grid-template-columns:repeat(2,1fr)}
  .letters{grid-template-columns:1fr;max-width:620px}
}
@media (max-width:768px){
  .nav-toggle{display:block}
  .mast-links{
    position:fixed;inset:66px 0 auto 0;z-index:49;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);border-bottom:1.5px solid var(--ink);
    box-shadow:0 20px 40px rgba(16,27,51,.12);
    max-height:0;overflow:hidden;transition:max-height .4s ease;
  }
  .mast-links.open{max-height:380px}
  .mast-links a{padding:16px 28px;border-top:1px solid var(--hair)}
  .mast-cta{border-bottom:none !important}
  .nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .section{padding:64px 0}
  .sec-head{grid-template-columns:1fr;gap:8px}
  .hero-facts{grid-template-columns:repeat(2,1fr);row-gap:22px}
  .entry summary{grid-template-columns:44px 1fr 32px;padding:20px 2px}
  .e-tag{display:none}
  .e-body{padding-left:62px}
}
@media (max-width:560px){
  .container{padding:0 20px}
  .hero{padding:56px 0 0}
  .method{grid-template-columns:1fr}
  .e-body{padding-left:2px}
  .switcher{bottom:14px;right:14px}
}