/* ============================================================
   NEXUS — shared design system
   Used by index.html, documentation.html, nexus-guide.html
   ============================================================ */

:root{
  --navy:#0E1A2B;
  --navy-2:#15263C;
  --cream:#F7F4EE;
  --orange:#E8703A;
  --orange-dim:#C4582A;
  --steel:#5B7A99;
  --steel-light:#9FB4C9;
  --green:#3FA66E;
  --line:rgba(255,255,255,0.08);
  --line-dark:rgba(14,26,43,0.1);
  --text-dim:#A9B7C9;
  --max:1180px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:'Inter',sans-serif;
  background:var(--cream);
  color:var(--navy);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}

.wrap{max-width:var(--max);margin:0 auto;padding:0 32px;}

h1,h2,h3,h4{font-family:'Fraunces',serif;font-weight:600;letter-spacing:-0.01em;line-height:1.12;}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;
  letter-spacing:0.18em;
  text-transform:uppercase;
  color:var(--orange);
  font-weight:500;
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:'';
  width:18px;height:1px;background:var(--orange);
  display:inline-block;
}

/* ============ NAV ============ */
nav{
  position:sticky;top:0;z-index:100;
  background:rgba(247,244,238,0.88);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-dark);
}
nav .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:68px;
}
.logo{
  font-family:'Fraunces',serif;font-weight:700;font-size:20px;
  letter-spacing:0.02em;
  display:flex;align-items:center;gap:10px;
  flex-shrink:0;white-space:nowrap;
}
.logo svg{display:block;flex-shrink:0;}
.logo .wordmark{display:flex;align-items:center;gap:10px;white-space:nowrap;}
.logo .nexus-name{white-space:nowrap;}
.logo svg{flex-shrink:0;}
.logo span{color:var(--orange);}
.logo small{
  font-family:'IBM Plex Mono',monospace;
  font-size:10px;color:var(--steel);
  letter-spacing:0.1em;font-weight:400;
  border-left:1px solid var(--line-dark);
  padding-left:10px;
}
footer .logo small{border-left-color:var(--line);}
.navlinks{display:flex;gap:36px;align-items:center;}
.navlinks a{
  font-size:14px;font-weight:500;color:var(--navy);
  opacity:0.7;transition:opacity .15s;
}
.navlinks a:hover{opacity:1;}
.navlinks a.active{opacity:1;color:var(--orange);}
.navlinks .cta{
  background:var(--navy);color:var(--cream);
  padding:9px 20px;border-radius:3px;opacity:1;
  font-family:'IBM Plex Mono',monospace;font-size:12px;
  letter-spacing:0.06em;
  transition:background .15s;
}
.navlinks .cta:hover{background:var(--orange);}

@media (max-width:860px){
  .navlinks a:not(.cta){display:none;}
}

/* ============ HERO ============ */
.hero{
  background:var(--navy);
  color:var(--cream);
  padding:90px 0 120px;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:'';
  position:absolute;
  top:-200px;right:-200px;
  width:600px;height:600px;
  border:1px solid var(--line);
  border-radius:50%;
}
.hero::after{
  content:'';
  position:absolute;
  top:-100px;right:-100px;
  width:600px;height:600px;
  border:1px solid var(--line);
  border-radius:50%;
}
.hero .wrap{position:relative;z-index:2;}
.hero-grid{
  display:grid;
  grid-template-columns:1.1fr 0.9fr;
  gap:64px;
  align-items:center;
}
.hero h1{
  font-size:clamp(38px,5.2vw,64px);
  margin:18px 0 22px;
  max-width:640px;
}
.hero h1 em{
  font-style:italic;
  color:var(--orange);
}
.hero p.lead{
  font-size:18px;
  color:var(--text-dim);
  max-width:520px;
  margin-bottom:34px;
}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 26px;
  border-radius:3px;
  font-size:14px;font-weight:600;
  font-family:'Inter',sans-serif;
  transition:all .15s;
  border:1px solid transparent;
  cursor:pointer;
}
.btn-primary{
  background:var(--orange);color:var(--navy);
}
.btn-primary:hover{background:#fff;}
.btn-ghost{
  border-color:var(--line);
  color:var(--cream);
}
.btn-ghost:hover{border-color:var(--orange);color:var(--orange);}

/* Hero layer stack visualization */
.stack-visual{
  display:flex;flex-direction:column;gap:6px;
  font-family:'IBM Plex Mono',monospace;
}
.stack-slab{
  background:var(--navy-2);
  border:1px solid var(--line);
  border-radius:4px;
  padding:13px 16px;
  display:flex;align-items:center;justify-content:space-between;
  font-size:12.5px;
  transition:transform .25s, border-color .25s, background .25s;
  cursor:default;
}
.stack-slab:hover{
  transform:translateX(6px);
  border-color:var(--orange);
  background:#1B2E47;
}
.stack-slab .num{color:var(--orange);font-weight:600;margin-right:12px;}
.stack-slab .nm{color:var(--cream);font-weight:500;flex:1;}
.stack-slab .tag{color:var(--steel-light);font-size:10.5px;text-align:right;}
.stack-slab.cross{
  border-style:dashed;
  border-color:rgba(232,112,58,0.35);
}
.stack-caption{
  font-size:11px;color:var(--steel-light);
  margin-top:10px;font-family:'IBM Plex Mono',monospace;
  letter-spacing:0.04em;
}

/* Stat bar */
.statbar{
  border-top:1px solid var(--line);
  margin-top:64px;
  padding-top:36px;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}
.stat .v{
  font-family:'Fraunces',serif;font-weight:600;
  font-size:34px;color:var(--orange);
}
.stat .l{
  font-size:12.5px;color:var(--text-dim);margin-top:4px;
}
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;}
  .statbar{grid-template-columns:repeat(2,1fr);gap:28px 24px;}
}

/* ============ SECTION COMMON ============ */
section{padding:96px 0;}
.section-head{
  max-width:680px;margin-bottom:56px;
}
.section-head h2{
  font-size:clamp(28px,3.6vw,42px);
  margin:14px 0 16px;
}
.section-head p{
  font-size:17px;color:var(--steel);
  max-width:600px;
}
.section-alt{background:var(--navy);color:var(--cream);}
.section-alt .section-head p{color:var(--text-dim);}
.section-alt .eyebrow{color:var(--orange);}

/* ============ PROBLEM / CARD GRID ============ */
.problem-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
  background:var(--line-dark);
  border:1px solid var(--line-dark);
}
.problem-card{
  background:var(--cream);
  padding:32px 28px;
}
.problem-card .pct{
  font-family:'Fraunces',serif;font-weight:600;
  font-size:40px;color:var(--orange);
  line-height:1;
}
.problem-card h4{
  font-size:17px;margin:14px 0 8px;font-weight:600;
}
.problem-card p{font-size:14.5px;color:var(--steel);}
@media (max-width:860px){
  .problem-grid{grid-template-columns:1fr;}
}

/* ============ ARCHITECTURE / LAYER STACK ============ */
.layer-stack{
  display:flex;flex-direction:column;gap:10px;
}
.layer-row{
  display:grid;
  grid-template-columns:64px 1fr 280px;
  gap:0;
  border:1px solid var(--line-dark);
  border-radius:6px;
  overflow:hidden;
  background:#fff;
  color:var(--navy);
  transition:box-shadow .2s, border-color .2s;
}
.layer-row:hover{
  border-color:var(--orange);
  box-shadow:0 8px 24px -8px rgba(232,112,58,0.25);
}
.layer-row.cross{
  background:linear-gradient(90deg,#FFF6EF,#fff);
  border-style:dashed;
  border-color:rgba(232,112,58,0.4);
}
.layer-num{
  background:var(--navy);
  color:var(--orange);
  font-family:'IBM Plex Mono',monospace;
  font-weight:600;font-size:18px;
  display:flex;align-items:center;justify-content:center;
}
.layer-row.cross .layer-num{background:var(--orange);color:var(--navy);}
.layer-main{padding:18px 24px;}
.layer-main h4{font-size:17px;margin-bottom:4px;}
.layer-main p{font-size:13.5px;color:var(--steel);}
.layer-tags{
  padding:18px 24px;
  border-left:1px solid var(--line-dark);
  display:flex;flex-wrap:wrap;gap:6px;
  align-items:center;
}
.tag{
  font-family:'IBM Plex Mono',monospace;
  font-size:10.5px;letter-spacing:0.03em;
  background:rgba(91,122,153,0.1);
  color:var(--steel);
  padding:4px 9px;border-radius:3px;
  border:1px solid rgba(91,122,153,0.18);
}
.layer-row.cross .tag{
  background:rgba(232,112,58,0.1);
  border-color:rgba(232,112,58,0.25);
  color:var(--orange-dim);
}
@media (max-width:860px){
  .layer-row{grid-template-columns:48px 1fr;}
  .layer-tags{display:none;}
}

.arch-note{
  margin-top:28px;padding:20px 24px;
  background:var(--navy);color:var(--cream);
  border-radius:6px;
  font-size:14px;
  display:flex;gap:14px;align-items:flex-start;
}
.arch-note .mark{
  font-family:'IBM Plex Mono',monospace;color:var(--orange);
  font-weight:600;font-size:13px;flex-shrink:0;
  padding-top:1px;
}

/* ============ EXTENSION TABLE ============ */
.ext-table{
  width:100%;border-collapse:collapse;
  font-size:14px;
}
.ext-table thead th{
  text-align:left;
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--steel-light);
  background:var(--navy);
  padding:14px 18px;
  font-weight:500;
}
.ext-table tbody td{
  padding:14px 18px;
  border-bottom:1px solid var(--line);
  color:var(--text-dim);
}
.ext-table tbody tr:hover{background:rgba(255,255,255,0.03);}
.ext-table td.lp{color:var(--cream);font-weight:600;font-family:'IBM Plex Mono',monospace;font-size:13px;}
.ext-table td.swap{color:var(--orange);}
.ext-scroll{overflow-x:auto;border-radius:6px;border:1px solid var(--line);}

/* ============ DEPLOY PATTERNS ============ */
.deploy-grid{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:16px;
}
.deploy-card{
  border:1px solid var(--line-dark);
  border-radius:6px;
  padding:24px 18px;
  background:#fff;
  transition:transform .2s, border-color .2s;
}
.deploy-card:hover{transform:translateY(-4px);border-color:var(--orange);}
.deploy-card .letter{
  font-family:'Fraunces',serif;font-weight:700;
  font-size:28px;color:var(--orange);
  margin-bottom:10px;
}
.deploy-card h4{font-size:14.5px;margin-bottom:8px;line-height:1.3;}
.deploy-card p{font-size:12.5px;color:var(--steel);}
@media (max-width:1020px){
  .deploy-grid{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:560px){
  .deploy-grid{grid-template-columns:1fr;}
}

/* ============ PILLARS ============ */
.pillars{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:1px;
  background:var(--line-dark);
  border:1px solid var(--line-dark);
}
.pillar{
  background:var(--cream);
  padding:30px 26px;
}
.pillar h4{font-size:16px;margin-bottom:8px;display:flex;align-items:center;gap:10px;}
.pillar h4::before{
  content:'';
  width:8px;height:8px;
  background:var(--orange);
  border-radius:50%;
  flex-shrink:0;
}
.pillar p{font-size:13.5px;color:var(--steel);}
@media (max-width:860px){
  .pillars{grid-template-columns:1fr;}
}

/* ============ CODE BLOCK ============ */
.code-block{
  background:var(--navy);
  border-radius:6px;
  padding:24px 28px;
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  color:var(--text-dim);
  overflow-x:auto;
  border:1px solid var(--line);
}
.code-block .c-cmd{color:var(--cream);}
.code-block .c-prompt{color:var(--orange);}
.code-block .c-result{color:var(--green);}
.code-block .c-comment{color:var(--steel);}
.code-block div{margin-bottom:6px;white-space:pre-wrap;}
.code-block div:last-child{margin-bottom:0;}

/* ============ TESTING GRID ============ */
.test-grid{
  display:grid;grid-template-columns:repeat(2,1fr);
  gap:12px;
}
.test-row{
  display:flex;justify-content:space-between;align-items:center;
  border:1px solid var(--line-dark);
  border-radius:6px;
  padding:16px 20px;
  background:#fff;
}
.test-row .nm{font-size:14px;font-weight:600;}
.test-row .focus{font-size:12.5px;color:var(--steel);margin-top:2px;}
.test-row .check{
  color:var(--green);font-family:'IBM Plex Mono',monospace;
  font-size:18px;flex-shrink:0;margin-left:16px;
}
@media (max-width:860px){.test-grid{grid-template-columns:1fr;}}

/* ============ ECOSYSTEM ============ */
.eco-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
}
.eco-card{
  border:1px solid var(--line);
  border-radius:6px;padding:28px;
  background:var(--navy-2);
}
.eco-status{
  font-family:'IBM Plex Mono',monospace;
  font-size:10.5px;letter-spacing:0.12em;text-transform:uppercase;
  padding:3px 10px;border-radius:20px;
  display:inline-block;margin-bottom:14px;
}
.eco-status.live{background:rgba(63,166,110,0.15);color:var(--green);border:1px solid rgba(63,166,110,0.3);}
.eco-status.dev{background:rgba(232,112,58,0.15);color:var(--orange);border:1px solid rgba(232,112,58,0.3);}
.eco-status.soon{background:rgba(159,180,201,0.12);color:var(--steel-light);border:1px solid rgba(159,180,201,0.25);}
.eco-card h4{font-size:19px;color:var(--cream);margin-bottom:8px;}
.eco-card p{font-size:13.5px;color:var(--text-dim);margin-bottom:14px;}
.eco-card a{font-size:13px;color:var(--orange);font-weight:600;}
@media (max-width:860px){.eco-grid{grid-template-columns:1fr;}}

/* ============ CTA ============ */
.cta-section{
  text-align:center;
  background:linear-gradient(180deg,var(--cream),#EFE9DF);
}
.cta-section h2{font-size:clamp(30px,4vw,46px);margin:14px auto 20px;max-width:680px;}
.cta-section p{font-size:17px;color:var(--steel);max-width:560px;margin:0 auto 32px;}
.cta-section .hero-ctas{justify-content:center;}
.cta-section .btn-ghost{border-color:var(--line-dark);color:var(--navy);}
.cta-section .btn-ghost:hover{border-color:var(--orange);color:var(--orange);}

/* ============ FOOTER ============ */
footer{background:var(--navy);color:var(--text-dim);padding:56px 0 32px;}
.footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;
  padding-bottom:40px;border-bottom:1px solid var(--line);
}
.footer-grid h5{
  font-family:'IBM Plex Mono',monospace;font-size:11px;
  letter-spacing:0.12em;text-transform:uppercase;
  color:var(--steel-light);margin-bottom:14px;font-weight:500;
}
.footer-grid ul{list-style:none;}
.footer-grid li{margin-bottom:8px;font-size:14px;}
.footer-grid li a:hover{color:var(--orange);}
.footer-bottom{
  padding-top:28px;display:flex;justify-content:space-between;
  font-size:12.5px;color:var(--steel);flex-wrap:wrap;gap:12px;
}
@media (max-width:860px){
  .footer-grid{grid-template-columns:1fr 1fr;}
}

/* ============ DEEP LINK ============ */
.deeplink{
  display:inline-flex;align-items:center;gap:6px;
  font-family:'IBM Plex Mono',monospace;
  font-size:12.5px;letter-spacing:0.04em;
  color:var(--orange);font-weight:600;
  margin-top:28px;
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  transition:border-color .15s, opacity .15s;
}
.deeplink:hover{border-color:var(--orange);}
.deeplink .arrow{transition:transform .15s;}
.deeplink:hover .arrow{transform:translateX(3px);}
.section-alt .deeplink{color:var(--orange);}
.cta-section .deeplink{
  display:block;margin:24px auto 0;color:var(--steel);
  border-bottom-color:transparent;
}
.cta-section .deeplink:hover{color:var(--orange);border-bottom-color:var(--orange);}

/* ============================================================
   DOC-PROSE — shared typography for documentation.html
   and the long-form chapters in nexus-guide.html
   ============================================================ */
.doc-prose p,
.doc-prose ul,
.doc-prose ol{
  font-size:16px;color:var(--navy);
  margin-bottom:16px;
  max-width:760px;
}
.doc-prose p strong{color:var(--navy);font-weight:600;}
.doc-prose ul,
.doc-prose ol{padding-left:22px;}
.doc-prose li{margin-bottom:6px;}
.doc-prose h3{
  font-size:24px;margin:48px 0 14px;
}
.doc-prose h4{
  font-size:17px;font-weight:600;
  margin:28px 0 10px;
}
.doc-prose code{
  font-family:'IBM Plex Mono',monospace;
  font-size:13.5px;
  background:rgba(14,26,43,0.06);
  border:1px solid var(--line-dark);
  border-radius:3px;
  padding:1px 6px;
  color:var(--navy);
}
.doc-prose a{color:var(--orange-dim);font-weight:600;border-bottom:1px solid rgba(232,112,58,0.3);}
.doc-prose a:hover{border-bottom-color:var(--orange);}

.chapter-num{
  display:inline-block;
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;letter-spacing:0.18em;text-transform:uppercase;
  color:var(--orange);
  margin-bottom:14px;font-weight:500;
}
.chapter{margin-bottom:56px;}
.chapter > h2{
  font-size:clamp(26px,3.4vw,36px);
  margin-bottom:18px;
}

/* doc page section wrapper */
.doc-section{margin-bottom:56px;}
.doc-section > h2{
  font-size:clamp(26px,3.4vw,36px);
  margin-bottom:18px;
}

/* ============ COMP CARD (documentation.html layers) ============ */
.comp-card{
  border:1px solid var(--line-dark);
  border-radius:6px;
  padding:28px;
  margin-bottom:18px;
  background:#fff;
  transition:border-color .2s, box-shadow .2s;
}
.comp-card:hover{
  border-color:var(--orange);
  box-shadow:0 8px 24px -8px rgba(232,112,58,0.18);
}
.comp-card h3{font-size:20px;margin-bottom:8px;}
.comp-card p{font-size:14.5px;color:var(--steel);margin-bottom:14px;}
.comp-card h4{
  font-size:13px;font-weight:600;
  font-family:'IBM Plex Mono',monospace;
  letter-spacing:0.08em;text-transform:uppercase;
  color:var(--orange);
  margin:18px 0 10px;
}
.comp-card ul{
  padding-left:22px;font-size:14px;color:var(--navy);
}
.comp-card ul li{margin-bottom:6px;}
.comp-card ul li strong{color:var(--navy);font-weight:600;}
.comp-card--accent{
  border-color:rgba(232,112,58,0.4);
  border-style:dashed;
  background:linear-gradient(180deg,#FFF6EF,#fff);
}
.comp-tag{
  display:inline-block;
  font-family:'IBM Plex Mono',monospace;
  font-size:10.5px;letter-spacing:0.12em;text-transform:uppercase;
  color:var(--steel);
  padding:3px 10px;border-radius:20px;
  border:1px solid var(--line-dark);
  margin-bottom:12px;
}
.comp-tag--accent{
  color:var(--orange);
  border-color:rgba(232,112,58,0.4);
  background:rgba(232,112,58,0.06);
}

.doc-highlights{
  display:grid;grid-template-columns:repeat(3,1fr);
  gap:14px;margin-top:24px;
}
.doc-highlight{
  border:1px solid var(--line-dark);
  border-radius:6px;
  padding:22px;
  background:#fff;
}
.doc-highlight h4{
  font-size:15px;font-weight:600;margin-bottom:6px;
  font-family:'Fraunces',serif;
  color:var(--navy);text-transform:none;letter-spacing:-0.01em;
}
.doc-highlight p{font-size:13.5px;color:var(--steel);}
@media (max-width:860px){.doc-highlights{grid-template-columns:1fr;}}

.compliance-row{
  display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;
}
.compliance-chip{
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;color:var(--navy);
  background:#fff;
  padding:8px 14px;border-radius:3px;
  border:1px solid var(--line-dark);
}
.compliance-chip strong{color:var(--orange);}

/* ============================================================
   PAGE HERO (compact hero for inner pages)
   ============================================================ */
.page-hero{
  background:var(--navy);color:var(--cream);
  padding:80px 0 64px;
  position:relative;overflow:hidden;
}
.page-hero::before{
  content:'';position:absolute;
  top:-200px;right:-200px;
  width:520px;height:520px;
  border:1px solid var(--line);border-radius:50%;
}
.page-hero .wrap{position:relative;z-index:2;}
.page-hero h1{
  font-size:clamp(34px,4.6vw,52px);
  margin:18px 0 18px;max-width:780px;
}
.page-hero h1 em{font-style:italic;color:var(--orange);}
.page-hero p.lead{
  font-size:17px;color:var(--text-dim);max-width:640px;
}
.breadcrumb{
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;letter-spacing:0.12em;text-transform:uppercase;
  color:var(--steel-light);margin-bottom:6px;
}
.breadcrumb a{color:var(--steel-light);}
.breadcrumb a:hover{color:var(--orange);}
.breadcrumb .sep{color:var(--steel);margin:0 8px;}

/* ============================================================
   GUIDE LAYOUT — sticky TOC + content (nexus-guide.html)
   ============================================================ */
.guide-shell{padding:72px 0;background:var(--cream);}
.guide-layout{
  display:grid;
  grid-template-columns:240px minmax(0, 1fr);
  gap:64px;
  max-width:var(--max);margin:0 auto;padding:0 32px;
}
.guide-content{
  min-width:0;
}
.guide-toc{
  position:sticky;top:96px;
  align-self:start;
  max-height:calc(100vh - 120px);overflow-y:auto;
  font-size:13.5px;
  padding-right:8px;
}
.guide-toc h4{
  font-family:'IBM Plex Mono',monospace;
  font-size:10.5px;letter-spacing:0.16em;text-transform:uppercase;
  color:var(--steel);
  margin-bottom:14px;font-weight:500;
}
.guide-toc ol{list-style:none;padding:0;counter-reset:tocnum;}
.guide-toc > ol > li{counter-increment:tocnum;margin-bottom:6px;}
.guide-toc > ol > li > a::before{
  content:counter(tocnum,decimal-leading-zero) "  ";
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;color:var(--steel-light);
}
.guide-toc a{
  display:block;color:var(--navy);opacity:0.75;
  padding:3px 0;
  transition:opacity .15s, color .15s;
}
.guide-toc a:hover{opacity:1;color:var(--orange);}
.guide-toc a.active{
  color:var(--orange);
  font-weight:700;
  opacity:1;
}
.guide-toc > ol > li > a.active::before,
.guide-toc > ol > li > a.parent-active::before {
  color: var(--orange);
}
.guide-toc ul{
  list-style:none;padding-left:22px;
  border-left:1px solid var(--line-dark);
  margin:4px 0 8px;
}
.guide-toc ul a{font-size:12.5px;padding:2px 0;}
@media (max-width:960px){
  .guide-layout{grid-template-columns:1fr;gap:0;}
  .guide-toc{
    position:static;max-height:none;
    margin-bottom:32px;padding:18px 22px;
    border:1px solid var(--line-dark);border-radius:6px;
    background:#fff;
  }
}

/* ============ GUIDE TABLE ============ */
.guide-table{
  width:100%;border-collapse:collapse;
  margin:20px 0 24px;
  font-size:14px;
  border:1px solid var(--line-dark);
  border-radius:6px;overflow:hidden;
}
.guide-table thead th{
  text-align:left;
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--steel-light);
  background:var(--navy);
  padding:12px 16px;
  font-weight:500;
}
.guide-table tbody td{
  padding:12px 16px;
  border-bottom:1px solid var(--line-dark);
  color:var(--navy);
  vertical-align:top;
}
.guide-table tbody tr:last-child td{border-bottom:none;}
.guide-table tbody td:first-child{
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;color:var(--orange-dim);
  font-weight:600;white-space:nowrap;
}
.guide-table.three-col tbody td:first-child{white-space:normal;}

/* ============ LAYER CARD (guide layer reference) ============ */
.layer-card{
  border:1px solid var(--line-dark);
  border-left:3px solid var(--orange);
  border-radius:6px;
  padding:22px 24px;
  background:#fff;
  margin:32px 0 12px;
}
.layer-card h3{font-size:20px;margin-bottom:8px;}
.layer-tag{
  display:inline-block;
  font-family:'IBM Plex Mono',monospace;
  font-size:10.5px;letter-spacing:0.12em;text-transform:uppercase;
  color:var(--orange);font-weight:600;
  margin-bottom:8px;
}
.layer-meta{
  display:flex;flex-wrap:wrap;gap:18px;
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;color:var(--steel);
  margin-top:10px;
}
.layer-meta code{
  font-size:12px;background:none;border:none;padding:0;
  color:var(--orange-dim);
}

/* ============ CALLOUTS ============ */
.callout{
  display:flex;gap:14px;
  padding:18px 20px;border-radius:6px;
  margin:18px 0;
  font-size:14px;
  background:#fff;
  border:1px solid var(--line-dark);
}
.callout .callout-tag{
  font-family:'IBM Plex Mono',monospace;
  font-size:10.5px;letter-spacing:0.12em;text-transform:uppercase;
  font-weight:600;
  flex-shrink:0;padding-top:1px;
}
.callout p{margin:0;font-size:14px;color:var(--navy);}
.callout.note{border-left:3px solid var(--steel);}
.callout.note .callout-tag{color:var(--steel);}
.callout.tip{border-left:3px solid var(--green);background:#F1FBF5;}
.callout.tip .callout-tag{color:var(--green);}
.callout.caution{border-left:3px solid var(--orange);background:#FFF6EF;}
.callout.caution .callout-tag{color:var(--orange);}

/* ============ PRE / CODE for prose ============ */
.doc-prose pre{
  background:var(--navy);
  border:1px solid var(--line);
  border-radius:6px;
  padding:20px 22px;
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;color:var(--text-dim);
  overflow-x:auto;
  margin:14px 0 22px;
  -webkit-overflow-scrolling:touch;
  position:relative;
}
.doc-prose pre code{
  background:none;border:none;padding:0;
  color:inherit;font-size:inherit;
  white-space:pre;
  display:block;line-height:1.6;
}
.doc-prose pre[data-lang]::before{
  content:attr(data-lang);
  position:absolute;top:8px;right:14px;
  font-family:'IBM Plex Mono',monospace;
  font-size:10px;letter-spacing:0.12em;text-transform:uppercase;
  color:var(--steel);
}
.doc-prose pre[data-lang="bash"] code{color:var(--cream);}
.doc-prose pre[data-lang="python"] code{color:var(--cream);}
.doc-prose pre[data-lang="yaml"] code{color:var(--cream);}

/* ============ GUIDE BADGES (hero) ============ */
.guide-badges{
  display:flex;flex-wrap:wrap;gap:8px;margin-top:24px;
}
.badge{
  font-family:'IBM Plex Mono',monospace;
  font-size:11px;letter-spacing:0.08em;
  color:var(--steel-light);
  background:rgba(255,255,255,0.04);
  padding:6px 12px;border-radius:3px;
  border:1px solid var(--line);
}
.badge.accent{
  color:var(--orange);
  border-color:rgba(232,112,58,0.4);
  background:rgba(232,112,58,0.08);
}

/* ============ SIGNOFF ============ */
.guide-signoff{
  margin-top:48px;padding:32px;
  border:1px dashed rgba(232,112,58,0.35);
  border-radius:6px;
  background:linear-gradient(180deg,#FFF6EF,#fff);
  text-align:center;
}
.signoff-headline{
  font-family:'Fraunces',serif;font-weight:600;
  font-size:24px;color:var(--navy);
  margin-bottom:8px;
}
.signoff-headline em{font-style:italic;color:var(--orange);}
.signoff-meta{
  font-family:'IBM Plex Mono',monospace;
  font-size:12px;color:var(--steel);
}
.signoff-meta a{color:var(--orange-dim);}

/* ============================================================
   RESPONSIVE REFINEMENTS
   ============================================================ */
/* Tablet (≤960px): tighten vertical rhythm and hero gap */
@media (max-width:960px){
  section{padding:72px 0;}
  .hero{padding:64px 0 80px;}
  .hero-grid{gap:40px;}
  .section-head{margin-bottom:40px;}
  .statbar{margin-top:48px;padding-top:28px;}
  .page-hero{padding:64px 0 52px;}
  .guide-shell{padding:56px 0;}
}

/* Phone (≤640px): collapse spacing further, scale type, tighten cards */
@media (max-width:640px){
  .wrap{padding:0 22px;}
  section{padding:56px 0;}
  .hero{padding:48px 0 64px;}
  .hero-grid{gap:32px;}
  .hero p.lead{font-size:16.5px;margin-bottom:26px;}
  .section-head{margin-bottom:32px;}
  .section-head p{font-size:15.5px;}

  .hero-ctas{gap:10px;}
  .hero-ctas .btn{flex:1 1 auto;justify-content:center;padding:13px 20px;}
  .cta-section .hero-ctas .btn{flex:0 1 auto;}

  .statbar{gap:22px 18px;}
  .stat .v{font-size:28px;}
  .stat .l{font-size:12px;}

  .stack-slab{padding:11px 14px;font-size:12px;}
  .stack-slab:hover{transform:none;}
  .stack-slab .tag{font-size:10px;}

  .problem-card{padding:26px 22px;}
  .problem-card .pct{font-size:34px;}

  .layer-main{padding:16px 18px;}
  .layer-main h4{font-size:16px;}
  .layer-main p{font-size:13px;}
  .arch-note{padding:16px 18px;font-size:13.5px;gap:10px;}

  .pillar{padding:24px 22px;}
  .deploy-card{padding:22px 18px;}
  .code-block{padding:20px 18px;font-size:12px;}

  .test-row{padding:14px 16px;}
  .test-row .nm{font-size:13.5px;}
  .test-row .focus{font-size:12px;}

  .eco-card{padding:22px 20px;}
  .eco-card h4{font-size:17px;}
  .eco-card p{font-size:13px;}

  .cta-section p{font-size:15.5px;}

  .footer-grid{grid-template-columns:1fr 1fr;gap:32px 24px;}
  .footer-grid > div:first-child{grid-column:1 / -1;}
  .footer-bottom{font-size:12px;}

  /* Inner-page tweaks */
  .page-hero{padding:48px 0 40px;}
  .guide-layout{padding:0 22px;}
  .comp-card{padding:22px 20px;}
  .layer-card{padding:18px 20px;}
  .doc-prose p,.doc-prose ul,.doc-prose ol{font-size:15px;}
  .doc-prose pre{font-size:12px;padding:18px;}
  .guide-table{font-size:13px;}
  .guide-table thead th,.guide-table tbody td{padding:10px 12px;}
}

/* Small phone (≤400px): iPhone SE / compact Android */
@media (max-width:400px){
  .wrap{padding:0 18px;}
  nav .wrap{height:60px;}
  .logo{font-size:18px;gap:8px;}
  .logo small{display:none;}
  .navlinks .cta{padding:8px 14px;font-size:11.5px;}

  .hero h1{font-size:34px;}
  .hero p.lead{font-size:15.5px;}

  .statbar{grid-template-columns:1fr;gap:20px;}
  .stat .v{font-size:30px;}

  .section-head h2{font-size:26px;}
  .section-head p{font-size:15px;}

  .problem-card .pct,
  .deploy-card .letter{font-size:30px;}

  .code-block{font-size:11.5px;padding:18px 16px;}
  .page-hero h1{font-size:30px;}
  .doc-prose pre{font-size:11.5px;}
}

/* Make wide horizontally-scrollable regions feel intentional on touch */
.ext-scroll,
.code-block{-webkit-overflow-scrolling:touch;}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{transition:none !important;}
}