:root{
  --bg:#FAF8F4;
  --paper:#FFFFFF;
  --soft:#F0ECE4;
  --text:#0B1628;
  --muted:#617086;
  --accent:#345985;
  --line:rgba(11,22,40,.13);
  --shadow:0 28px 90px rgba(11,22,40,.10);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Arial,sans-serif;
  line-height:1.62;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}

.site-header{
  position:sticky;
  top:0;
  z-index:50;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:18px clamp(22px,5vw,72px);
  background:rgba(250,248,244,.84);
  backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
}
.logo{
  font-weight:950;
  letter-spacing:.14em;
  font-size:.95rem;
  white-space:nowrap;
}
.nav{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:18px;
  color:var(--muted);
  font-size:.93rem;
  flex-wrap:wrap;
}
.nav a:hover{color:var(--text)}
.menu-toggle{
  display:none;
  background:transparent;
  border:0;
  width:42px;
  height:42px;
  position:relative;
}
.menu-toggle span{
  position:absolute;
  left:9px;
  right:9px;
  height:2px;
  background:var(--text);
  transition:.22s;
}
.menu-toggle span:first-child{top:16px}
.menu-toggle span:last-child{bottom:16px}
.menu-open .menu-toggle span:first-child{transform:translateY(4px) rotate(45deg)}
.menu-open .menu-toggle span:last-child{transform:translateY(-4px) rotate(-45deg)}

.hero{
  min-height:88svh;
  position:relative;
  overflow:hidden;
  padding:130px clamp(22px,7vw,96px) 90px;
  display:flex;
  align-items:center;
}
.hero-ribbon{
  position:absolute;
  top:21%;
  left:0;
  white-space:nowrap;
  font-weight:950;
  font-size:clamp(58px,10vw,168px);
  letter-spacing:-.075em;
  color:rgba(11,22,40,.045);
  animation:ribbon 19s linear infinite;
  pointer-events:none;
  will-change:transform;
}
@keyframes ribbon{
  from{transform:translateX(0)}
  to{transform:translateX(-100%)}
}
.hero-inner{
  max-width:1180px;
  width:100%;
  margin:0 auto;
  position:relative;
}
.kicker{
  margin:0 0 18px;
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:.16em;
  font-size:.76rem;
  font-weight:850;
}
h1,h2,h3{
  margin:0;
  line-height:.96;
  letter-spacing:-.055em;
}
h1{
  max-width:1120px;
  font-size:clamp(4rem,11vw,10.5rem);
}
h2{
  max-width:1040px;
  font-size:clamp(2.7rem,7vw,6.7rem);
}
h3{font-size:1.45rem}
.hero-sub{
  margin:8px 0 24px;
  color:var(--accent);
  font-size:clamp(2rem,5vw,5rem);
  font-weight:920;
  line-height:1;
  letter-spacing:-.055em;
}
.hero-copy{
  max-width:760px;
  color:var(--muted);
  font-size:clamp(1.2rem,2.2vw,1.6rem);
}
.button{
  display:inline-flex;
  margin-top:30px;
  padding:14px 22px;
  border-radius:999px;
  background:var(--text);
  color:white;
  font-weight:850;
  transition:.22s;
}
.button:hover{background:var(--accent);transform:translateY(-2px)}

.section{
  max-width:1180px;
  margin:0 auto;
  padding:clamp(76px,10vw,140px) clamp(22px,6vw,70px);
}
.section p{
  color:var(--muted);
  font-size:1.1rem;
  max-width:860px;
}
.large{
  font-size:clamp(1.45rem,3vw,2.45rem)!important;
  line-height:1.18;
  letter-spacing:-.035em;
  max-width:980px!important;
  color:#26354a!important;
}
.essay-section{max-width:1040px}
.essay{
  max-width:890px;
  margin-top:36px;
}
.essay p{
  font-size:1.18rem;
  line-height:1.84;
  color:#344153;
  margin:0 0 1.25em;
}
.essay .intro{

  line-height:1.66;
  color:#223047;
}
.essay .intro:first-letter{
  float:left;
  font-size:4.9em;
  line-height:.82;
  margin:.08em .12em 0 0;
  font-weight:950;
  color:var(--text);
  letter-spacing:-.08em;
}

.mechanism{max-width:1220px}
.svg-panel{
  margin-top:48px;
  padding:28px;
  border:1px solid var(--line);
  border-radius:32px;
  background:linear-gradient(180deg,rgba(255,255,255,.78),rgba(255,255,255,.42));
  box-shadow:var(--shadow);
}
svg{display:block;width:100%;height:auto}
.svg-node rect{
  fill:white;
  stroke:rgba(11,22,40,.14);
  stroke-width:1.5;
}
.svg-node text{
  text-anchor:middle;
  font-weight:900;
  font-size:28px;
  fill:var(--text);
  letter-spacing:-.03em;
}
.svg-node .small{
  font-size:15px;
  font-weight:650;
  fill:var(--muted);
  letter-spacing:0;
}
.flow-line{
  stroke:url(#lineGradient);
  stroke-width:3;
  stroke-linecap:round;
  stroke-dasharray:9 10;
  animation:dash 9s linear infinite;
}
.flow-line.secondary{opacity:.22}
@keyframes dash{to{stroke-dashoffset:-180}}

.feature-list{
  margin-top:48px;
  display:grid;
  gap:0;
}
.feature-list article{
  display:grid;
  grid-template-columns:70px 280px 1fr;
  gap:24px;
  align-items:start;
  padding:28px 0;
  border-top:1px solid var(--line);
}
.feature-list span{
  color:var(--accent);
  font-weight:950;
}
.feature-list p{margin:0}

.examples-section{
  max-width:none;
  background:var(--soft);
}
.examples-section>.kicker,
.examples-section>h2{
  max-width:1180px;
  margin-left:auto;
  margin-right:auto;
}
.examples{
  max-width:1180px;
  margin:42px auto 0;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:16px;
}
.examples article,
.term-grid article{
  background:rgba(255,255,255,.76);
  border:1px solid var(--line);
  border-radius:24px;
  padding:24px;
  box-shadow:0 18px 50px rgba(11,22,40,.045);
  transition:transform .22s, box-shadow .22s;
}
.examples article:hover,
.term-grid article:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow);
}
.examples h3,
.term-grid h3{
  margin-bottom:12px;
  letter-spacing:-.035em;
}
.examples p,
.term-grid p{
  font-size:1rem;
  margin:0;
  color:var(--muted);
}
.term-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:18px;
  margin-top:42px;
}

.faq details{
  max-width:880px;
  border-top:1px solid var(--line);
  padding:22px 0;
}
.faq summary{
  cursor:pointer;
  font-weight:850;
  font-size:1.2rem;
}
.faq details p{margin-bottom:0}

.book-note{
  max-width:880px;
  margin:0 auto 86px;
  padding:30px clamp(22px,5vw,46px);
  border:1px solid var(--line);
  border-radius:26px;
  background:rgba(255,255,255,.58);
  display:flex;
  gap:24px;
  align-items:center;
  justify-content:space-between;
}
.book-note p{margin:0;color:var(--muted)}
.book-note a{white-space:nowrap;font-weight:850;color:var(--accent)}

.footer{
  border-top:1px solid var(--line);
  padding:34px clamp(22px,5vw,70px);
  display:flex;
  justify-content:space-between;
  gap:20px;
  color:var(--muted);
}
.footer nav{
  display:flex;
  gap:20px;
  flex-wrap:wrap;
}

.legal h1{font-size:clamp(3rem,8vw,7rem)}
.legal .box{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:24px;
  padding:28px;
  margin-top:32px;
  box-shadow:var(--shadow);
}

.reveal{
  opacity:0;
  transform:translateY(24px);
  transition:opacity .75s ease, transform .75s ease;
}
.reveal.visible{
  opacity:1;
  transform:none;
}

@media(max-width:1020px){
  .menu-toggle{display:block}
  .nav{
    position:fixed;
    top:72px;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:flex-start;
    padding:26px clamp(22px,5vw,72px);
    background:var(--bg);
    border-bottom:1px solid var(--line);
    font-size:1.35rem;
    font-weight:850;
  }
  .menu-open .nav{display:flex}
  .examples{grid-template-columns:repeat(2,1fr)}
  .feature-list article{grid-template-columns:1fr;gap:10px}
}
@media(max-width:680px){
  .hero{min-height:78svh}
  h1{font-size:clamp(3.4rem,18vw,5.4rem)}
  .examples,
  .term-grid{grid-template-columns:1fr}
  .book-note,
  .footer{flex-direction:column;align-items:flex-start}
  .essay p{font-size:1.08rem}
  .essay .intro{font-size:1.18rem}
  .svg-panel{padding:12px;border-radius:22px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;scroll-behavior:auto!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}