@import url('https://fonts.googleapis.com/css2?family=STIX+Two+Text:ital,wght@0,400;0,500;0,600;0,700;1,400&family=IBM+Plex+Sans:ital,wght@0,400;0,500;0,600;1,400&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --nocturne:#0F1526;
  --ink:#273249;
  --slate:#5A6478;
  --line:#D8DDE4;
  --daylight:#F2F4F6;
  --white:#FFFFFF;
  --sodium:#F2A007;
  --sodium-deep:#C98104;
  --verdict:#1E9E6A;
  --fault:#C74440;
  --maxw:1120px;
  --textw:880px;
}

*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.01ms!important;animation-iteration-count:1!important;transition:none!important;scroll-behavior:auto!important;}
}

body{
  background:var(--daylight);
  color:var(--nocturne);
  font-family:'IBM Plex Sans',system-ui,sans-serif;
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

a{color:inherit;}
strong{font-weight:600;}
em{font-family:'STIX Two Text',serif;}

/* focus visibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
summary:focus-visible{
  outline:3px solid var(--sodium);
  outline-offset:3px;
  border-radius:2px;
}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  background:var(--sodium);
  color:var(--nocturne);
  padding:10px 18px;
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  z-index:200;
}
.skip-link:focus{left:12px;top:12px;}

/* ---------- header ---------- */
header.site-header{
  background:var(--nocturne);
  color:var(--daylight);
  position:relative;
  z-index:100;
}
.header-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:20px 24px;
  max-width:var(--maxw);
  margin:0 auto;
}
.wordmark{
  font-family:'STIX Two Text',serif;
  font-weight:600;
  font-size:24px;
  letter-spacing:-0.01em;
  color:var(--daylight);
  text-decoration:none;
  display:inline-flex;
  align-items:baseline;
  gap:2px;
}
.wordmark .tsym{color:var(--sodium);margin-left:4px;}

nav.site-nav{display:flex;align-items:center;gap:32px;}
nav.site-nav ul{
  list-style:none;
  display:flex;
  gap:28px;
  font-family:'IBM Plex Sans',sans-serif;
  font-size:15px;
}
nav.site-nav a{
  text-decoration:none;
  color:#C6CCD8;
  padding:6px 2px;
  border-bottom:2px solid transparent;
}
nav.site-nav a:hover,
nav.site-nav a[aria-current="page"]{
  color:var(--daylight);
  border-bottom-color:var(--sodium);
}

.nav-toggle{
  display:none;
  background:none;
  border:1px solid var(--slate);
  color:var(--daylight);
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  padding:8px 12px;
  cursor:pointer;
}

@media (max-width:720px){
  nav.site-nav ul{
    flex-direction:column;
    gap:0;
    position:absolute;
    top:100%;
    left:0;
    right:0;
    background:var(--nocturne);
    border-top:1px solid #1B2438;
    padding:8px 24px 18px;
  }
  nav.site-nav ul a{
    display:block;
    padding:12px 0;
  }
  nav.site-nav{
    display:none;
  }
  nav.site-nav.open{display:block;width:100%;}
  .nav-toggle{display:block;}
  .header-row{flex-wrap:wrap;}
}

/* ---------- hero ---------- */
.hero{
  background:var(--nocturne);
  color:var(--daylight);
  padding:88px 0 76px;
  overflow:hidden;
}
.hero .eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  letter-spacing:0.12em;
  text-transform:uppercase;
  color:var(--sodium);
  margin-bottom:18px;
}
.hero h1{
  font-family:'STIX Two Text',serif;
  font-weight:600;
  font-size:clamp(36px,6.5vw,68px);
  letter-spacing:-0.015em;
  line-height:1.05;
  max-width:16ch;
}
.hero .sub{
  margin-top:22px;
  font-size:19px;
  color:#B9C0CE;
  max-width:640px;
}
.hero .actions{
  margin-top:36px;
  display:flex;
  gap:20px;
  flex-wrap:wrap;
  align-items:center;
}

.reveal{
  opacity:0;
  transform:translateY(14px);
  animation:reveal 0.7s ease-out forwards;
}
.reveal.d1{animation-delay:0.08s;}
.reveal.d2{animation-delay:0.16s;}
.reveal.d3{animation-delay:0.24s;}
@keyframes reveal{
  to{opacity:1;transform:translateY(0);}
}
@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1;transform:none;animation:none;}
}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;
  font-family:'IBM Plex Sans',sans-serif;
  font-weight:600;
  font-size:16px;
  text-decoration:none;
  padding:14px 26px;
  border-radius:3px;
  transition:transform 0.15s ease, box-shadow 0.15s ease;
  border:1px solid transparent;
  cursor:pointer;
}
.btn-primary{
  background:var(--sodium);
  color:var(--nocturne);
}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:0 6px 18px rgba(242,160,7,0.25);
}
.btn-secondary-link{
  font-family:'IBM Plex Sans',sans-serif;
  font-weight:600;
  font-size:16px;
  color:var(--daylight);
  text-decoration:none;
  border-bottom:2px solid var(--slate);
  padding-bottom:3px;
}
.btn-secondary-link:hover{border-bottom-color:var(--sodium);}

.on-light .btn-secondary-link{color:var(--ink);border-bottom-color:var(--line);}
.on-light .btn-secondary-link:hover{border-bottom-color:var(--sodium-deep);}

/* ---------- sections ---------- */
section{padding:88px 0;}
section.tight{padding:64px 0;}
.section-on-dark{background:var(--nocturne);color:var(--daylight);}
.section-on-light{background:var(--daylight);color:var(--nocturne);}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  letter-spacing:0.12em;
  text-transform:uppercase;
  color:var(--sodium-deep);
  margin-bottom:14px;
}
.section-on-dark .eyebrow{color:var(--sodium);}

h2{
  font-family:'STIX Two Text',serif;
  font-weight:600;
  font-size:clamp(28px,4.2vw,40px);
  letter-spacing:-0.01em;
  line-height:1.12;
  margin-bottom:20px;
  max-width:22ch;
}
h3{
  font-family:'STIX Two Text',serif;
  font-weight:600;
  font-size:21px;
  line-height:1.25;
  margin-bottom:12px;
}
p{max-width:64ch;}
.lede{font-size:19px;color:var(--ink);max-width:680px;}
.section-on-dark .lede{color:#C6CCD8;}

.intro-line{font-size:18px;color:var(--ink);max-width:680px;margin-bottom:48px;}
.section-on-dark .intro-line{color:#C6CCD8;}

/* ---------- card grid ---------- */
.card-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
  margin-top:44px;
}
@media (max-width:860px){
  .card-grid{grid-template-columns:1fr;}
}
.card{
  background:var(--white);
  border:1px solid var(--line);
  padding:30px 28px;
  transition:transform 0.15s ease, box-shadow 0.15s ease;
}
.card:hover{
  transform:translateY(-3px);
  box-shadow:0 10px 24px rgba(15,21,38,0.08);
}
.card .figure{
  font-family:'IBM Plex Mono',monospace;
  font-size:44px;
  color:var(--sodium-deep);
  line-height:1;
  margin-bottom:8px;
}
.card .label{
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--slate);
  margin-bottom:14px;
}
.card p{font-size:15.5px;color:var(--ink);max-width:none;}

/* ---------- steps ---------- */
.step-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  margin-top:12px;
}
@media (max-width:920px){
  .step-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:560px){
  .step-grid{grid-template-columns:1fr;}
}
.step{
  border-top:3px solid var(--line);
  padding-top:18px;
}
.step.is-conclusion{border-top-color:var(--sodium);}
.step .marker{
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  color:var(--slate);
  margin-bottom:10px;
}
.step.is-conclusion .marker{color:var(--sodium-deep);}
.step h3{font-size:19px;margin-bottom:10px;}
.step h3 .tsym{color:var(--sodium-deep);margin-left:6px;}
.step p{font-size:15px;color:var(--ink);}

/* ---------- feature blocks ---------- */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:28px;
  margin-top:44px;
}
@media (max-width:860px){
  .feature-grid{grid-template-columns:1fr;}
}
.feature h3{margin-bottom:12px;}
.feature p{font-size:15.5px;color:var(--ink);}

/* ---------- comparison ---------- */
.compare{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:1px;
  margin-top:40px;
  background:var(--line);
  border:1px solid var(--line);
}
@media (max-width:720px){
  .compare{grid-template-columns:1fr;}
}
.compare .col{padding:32px;background:var(--daylight);}
.compare .col.dark{background:var(--nocturne);color:var(--daylight);}
.compare .col-label{
  font-family:'IBM Plex Mono',monospace;
  font-size:13px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  margin-bottom:20px;
  color:var(--slate);
}
.compare .col.dark .col-label{color:var(--sodium);}
.compare ul{list-style:none;}
.compare .col:not(.dark) li{
  color:var(--slate);
  padding:10px 0;
  border-bottom:1px solid var(--line);
  font-size:15.5px;
}
.compare .col.dark li{
  padding:10px 0 10px 22px;
  border-bottom:1px solid #1B2438;
  font-size:15.5px;
  position:relative;
}
.compare .col.dark li::before{
  content:"∴";
  position:absolute;
  left:0;
  color:var(--sodium);
  font-family:'STIX Two Text',serif;
}
.compare li:last-child{border-bottom:none;}

/* ---------- pricing / cta band ---------- */
.band-cta{margin-top:36px;}

/* ---------- FAQ ---------- */
.faq-list{margin-top:40px;max-width:var(--textw);}
.faq-item{
  border-bottom:1px solid var(--line);
}
.faq-item summary{
  font-family:'STIX Two Text',serif;
  font-weight:600;
  font-size:18px;
  padding:22px 0;
  cursor:pointer;
  list-style:none;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+";
  font-family:'IBM Plex Mono',monospace;
  font-size:20px;
  color:var(--sodium-deep);
  flex-shrink:0;
}
.faq-item[open] summary::after{content:"−";}
.faq-item p{
  padding-bottom:22px;
  color:var(--ink);
  font-size:16px;
}

/* ---------- closing / conclusion device ---------- */
.closing{
  text-align:left;
}
.closing .pre-line{
  font-family:'IBM Plex Sans',sans-serif;
  font-size:15px;
  color:var(--slate);
  margin-bottom:22px;
}
.closing .tline{
  font-family:'STIX Two Text',serif;
  font-size:clamp(24px,3.6vw,34px);
  line-height:1.25;
  max-width:20ch;
  margin-bottom:36px;
}
.closing .tline .tsym{color:var(--sodium);margin-right:10px;}
.section-on-light .closing .tline .tsym{color:var(--sodium-deep);}

/* ---------- rules / numbered principles ---------- */
.rules-list{margin-top:40px;display:flex;flex-direction:column;gap:32px;max-width:var(--textw);}
.rule{
  display:grid;
  grid-template-columns:56px 1fr;
  gap:18px;
}
@media (max-width:520px){
  .rule{grid-template-columns:36px 1fr;}
}
.rule .num{
  font-family:'IBM Plex Mono',monospace;
  font-size:15px;
  color:var(--sodium-deep);
  border-top:2px solid var(--sodium);
  padding-top:8px;
}
.rule h3{margin-bottom:8px;}
.rule p{font-size:15.5px;color:var(--ink);max-width:none;}

/* ---------- prose ---------- */
.prose{max-width:var(--textw);}
.prose p{margin-bottom:20px;font-size:17px;}

/* ---------- contact ---------- */
.contact-block{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  margin-top:16px;
}
@media (max-width:820px){
  .contact-block{grid-template-columns:1fr;}
}
.contact-email{
  font-family:'IBM Plex Mono',monospace;
  font-size:20px;
  color:var(--sodium-deep);
  letter-spacing:0.02em;
  word-break:break-word;
}
.contact-block .lead-line{margin-top:16px;font-size:16px;color:var(--ink);}

form.contact-form{display:flex;flex-direction:column;gap:18px;}
.form-field{display:flex;flex-direction:column;gap:6px;}
.form-field label{
  font-family:'IBM Plex Mono',monospace;
  font-size:12.5px;
  letter-spacing:0.06em;
  text-transform:uppercase;
  color:var(--slate);
}
.form-field input,
.form-field textarea,
.form-field select{
  font-family:'IBM Plex Sans',sans-serif;
  font-size:16px;
  padding:12px 14px;
  border:1px solid var(--line);
  background:var(--white);
  color:var(--nocturne);
  border-radius:2px;
}
.form-field textarea{min-height:130px;resize:vertical;}
.form-footnote{
  font-size:13.5px;
  color:var(--slate);
  margin-top:4px;
  max-width:none;
}
.form-status{
  font-family:'IBM Plex Mono',monospace;
  font-size:14px;
  margin-top:8px;
  color:var(--verdict);
}

/* ---------- footer ---------- */
footer.site-footer{
  background:var(--nocturne);
  color:var(--slate);
  font-family:'IBM Plex Mono',monospace;
  font-size:12.5px;
  padding:36px 0;
}
footer.site-footer .wrap{
  display:flex;
  flex-wrap:wrap;
  gap:8px 14px;
  align-items:center;
  justify-content:space-between;
}
footer.site-footer .tsym{color:var(--sodium);}
footer.site-footer nav ul{
  list-style:none;
  display:flex;
  gap:16px;
}
footer.site-footer a{text-decoration:none;color:var(--slate);}
footer.site-footer a:hover{color:var(--daylight);}
footer .foot-left{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;}

/* ---------- deduction diagram svg ---------- */
.diagram-wrap{margin-top:56px;}
.diagram-wrap svg{width:100%;height:auto;display:block;}

/* ---------- utility ---------- */
.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
}