:root{
  --bg:#f7f7f7;
  --surface:#ffffff;
  --surface-soft:#fcfaf3;
  --text:#222;
  --muted:#666;
  --line:#e5e5e5;
  --gold:#c7961a;
  --gold-dark:#9d7410;
  --gold-soft:#fff7df;
  --shadow:0 10px 30px rgba(0,0,0,0.08);
  --radius:18px;
  --max:1180px;
}

*{box-sizing:border-box}
html{
  scroll-behavior:smooth;
  scroll-padding-top:60px;
}

section[id]{
  scroll-margin-top:60px;
}

body{
  margin:0;
  font-family:Arial,Helvetica,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}

a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}

.container{
  width:min(100% - 32px,var(--max));
  margin:0 auto;
}

.topbar{
  background:#fff;
  border-bottom:1px solid var(--line);
  position:sticky;
  top:0;
  z-index:50;
}

.nav{
  min-height:76px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}

.brand{
  display:flex;
  align-items:center;
  gap:14px;
  font-weight:700;
  font-size:1.2rem;
}

.brand img{
  width:52px;
  height:52px;
  border-radius:50%;
  object-fit:cover;
  box-shadow:0 8px 20px rgba(0,0,0,0.12);
  background:#fff;
}

.nav-links{
  display:flex;
  align-items:center;
  gap:22px;
  flex-wrap:wrap;
  color:var(--muted);
}

.nav-links a:hover{color:var(--gold-dark)}

.button{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:12px 18px;
  border-radius:999px;
  font-weight:700;
  border:1px solid transparent;
}

.button-primary{
  background:linear-gradient(180deg,#e7be4d,var(--gold));
  color:#221700;
  box-shadow:0 10px 24px rgba(199,150,26,0.25);
}

.button-secondary{
  background:#fff;
  border-color:#d8d8d8;
  color:#333;
}

.hero{
  background:linear-gradient(180deg,#fff 0%,#f8f5ea 100%);
  border-bottom:1px solid var(--line);
}

.hero-inner{
  padding:56px 0 48px;
  display:grid;
  grid-template-columns:1.15fr 0.85fr;
  gap:40px;
  align-items:center;
}

.hero h1,
.hero h2{
  font-size:clamp(2rem,4vw,3rem);
  line-height:1.08;
  margin:0 0 18px;
}

.hero p{
  margin:0 0 26px;
  color:var(--muted);
  font-size:1.04rem;
}

.hero-actions{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
}

.coin-panel{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:24px;
  box-shadow:var(--shadow);
  padding:22px;
}

.coin-panel img{
  margin:auto;
  border-radius:50%;
}

.coin-meta{
  display:grid;
  gap:10px;
  color:var(--muted);
}

.page-hero{
  background:linear-gradient(180deg,#fff 0%,#f8f5ea 100%);
  border-bottom:1px solid var(--line);
}

.page-hero-inner{
  padding:52px 0 42px;
}

.eyebrow{
  display:inline-block;
  margin-bottom:12px;
  padding:6px 12px;
  background:var(--gold-soft);
  color:var(--gold-dark);
  border:1px solid #f0dd99;
  border-radius:999px;
  font-size:.9rem;
  font-weight:700;
}

.page-hero h1{
  font-size:clamp(2rem,4vw,3.2rem);
  line-height:1.08;
  margin:0 0 12px;
}

.page-hero p{
  margin:0;
  color:var(--muted);
  max-width:830px;
  font-size:1.04rem;
}

main section{
  padding:38px 0;
}

.section-title{
  font-size:clamp(1.55rem,3vw,2.35rem);
  margin:0 0 14px;
}

.section-sub{
  color:var(--muted);
  max-width:820px;
  margin:0 0 26px;
}

.grid{
  display:grid;
  gap:18px;
}

.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.feature-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}

.split{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
}

.resources{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}

.resource-link{
  color:var(--gold-dark);
  font-weight:700;
}

.architecture{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:18px;
}

.arch-box{
  text-align:center;
  background:var(--surface);
  border:1px solid var(--line);
  padding:24px;
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}

.arrow{
  text-align:center;
  font-size:28px;
  color:var(--gold);
  margin-top:10px;
}

.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:24px;
  box-shadow:var(--shadow);
}

.card h2,.card h3{margin-top:0}
.card p,.card li{color:var(--muted)}
.card ul{margin:0;padding-left:18px}

.kv{
  display:grid;
  gap:12px;
}

.kv-row{
  display:flex;
  justify-content:space-between;
  gap:18px;
  padding:12px 0;
  border-bottom:1px solid var(--line);
}

.kv-row:last-child{border-bottom:0}

.code{
  font-family:Consolas,Monaco,monospace;
  background:#f1f1f1;
  border:1px solid #ddd;
  border-radius:8px;
  padding:3px 8px;
  color:#333;
  word-break:break-all;
}

.notice{
  border-left:4px solid var(--gold);
  padding:14px 16px;
  background:var(--surface-soft);
  border-radius:12px;
  color:var(--muted);
}

.steps{
  display:grid;
  gap:16px;
}

.step{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:16px;
  padding:20px;
  box-shadow:var(--shadow);
}

.step strong{
  display:block;
  margin-bottom:8px;
  color:var(--text);
}

footer{
  padding:36px 0 60px;
  border-top:1px solid var(--line);
  background:#fff;
  color:var(--muted);
  margin-top:24px;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.4fr .8fr .8fr;
  gap:24px;
}

.footer-links{
  display:grid;
  gap:10px;
}

.small{
  font-size:.95rem;
}

@media (max-width:980px){
  .hero-inner,
  .feature-grid,
  .resources,
  .architecture,
  .grid-4,.grid-3,.grid-2,
  .split,
  .footer-grid{
    grid-template-columns:1fr 1fr;
  }
}

@media (max-width:760px){
  .nav{
    flex-direction:column;
    align-items:flex-start;
    padding:14px 0;
  }

  .nav-links{
    width:100%;
    justify-content:space-between;
  }

  .hero-inner,
  .feature-grid,
  .resources,
  .architecture,
  .grid-4,.grid-3,.grid-2,
  .split,
  .footer-grid{
    grid-template-columns:1fr;
  }

  .page-hero-inner{
    padding:38px 0 32px;
  }

  .hero-inner{
    padding:38px 0 32px;
  }
}