* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
/* Ethereum-inspired palette: brand #627EEA, deep indigo base */
:root {
  --eth-brand: #627eea;
  --eth-brand-mid: #8b9cff;
  --eth-brand-soft: rgba(98, 126, 234, 0.45);
  --eth-bg-0: #07070d;
  --eth-bg-1: #0e0e18;
  --eth-bg-2: #14142a;
  --eth-hero: linear-gradient(165deg, #12121f 0%, #1a1a32 42%, #0f1020 100%);
  --eth-surface: rgba(255, 255, 255, 0.06);
  --eth-surface-strong: rgba(255, 255, 255, 0.1);
  --eth-text: #e8eaf6;
  --eth-muted: #9ca3c7;
  --eth-border: rgba(98, 126, 234, 0.28);
}

body {
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background: linear-gradient(180deg, var(--eth-bg-0) 0%, var(--eth-bg-1) 45%, #0a0a14 100%);
  color: var(--eth-text);
  min-height: 100vh;
}

.wrap { width: min(1160px, 92%); margin: 0 auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: rgba(14, 14, 28, 0.82);
  border-bottom: 1px solid var(--eth-border);
  margin-bottom: 0;
}

.nav {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--eth-text);
  font-weight: 700;
  letter-spacing: .2px;
}

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.menu { display: flex; gap: 20px; flex-wrap: wrap; }
.menu a {
  color: var(--eth-muted);
  text-decoration: none;
  font-size: 14px;
}
.menu a:hover { color: var(--eth-brand-mid); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.lang-switch {
  display: flex;
  gap: 6px;
}

.lang-btn {
  border: 1px solid var(--eth-border);
  background: var(--eth-surface);
  color: var(--eth-text);
  text-decoration: none;
  display: inline-block;
  border-radius: 8px;
  font-size: 12px;
  padding: 6px 9px;
  cursor: pointer;
}

.lang-btn.active {
  background: rgba(98, 126, 234, 0.28);
  border-color: var(--eth-brand);
  color: #fff;
}

.hero {
  padding: 48px 0 72px;
  background: var(--eth-hero);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 28px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--eth-muted);
  font-size: 14px;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1.08;
  color: var(--eth-text);
}

.hero p {
  margin-top: 16px;
  color: var(--eth-muted);
  line-height: 1.75;
  max-width: 700px;
}

.hero-actions {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 11px 18px;
  border: 1px solid var(--eth-border);
  border-radius: 10px;
  color: var(--eth-text);
  background: var(--eth-surface);
  text-decoration: none;
  font-weight: 600;
}
.btn.primary {
  background: rgba(98, 126, 234, 0.35);
  border-color: var(--eth-brand);
  color: #fff;
}
.btn:hover {
  border-color: var(--eth-brand-mid);
}

.hero-card {
  border: 1px solid var(--eth-border);
  background: var(--eth-surface-strong);
  border-radius: 16px;
  padding: 24px;
}
.hero-card img {
  width: 92px;
  height: 92px;
  border-radius: 50%;
}
.hero-card h3 { margin: 14px 0 8px; color: var(--eth-text); }
.hero-card code {
  display: block;
  word-break: break-all;
  color: var(--eth-brand-mid);
  background: rgba(98, 126, 234, 0.12);
  padding: 10px 12px;
  border-radius: 8px;
}
.hero-card code.hero-contract a {
  display: inline-block;
  width: 100%;
  color: #c8d4ff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.2px;
}
.hero-card code.hero-contract a:hover {
  color: #ffffff;
  text-decoration: none;
}

.hero-card code.hero-contract {
  border: 1px solid rgba(98, 126, 234, 0.35);
}
.hero-card code.hero-contract:hover {
  background: rgba(98, 126, 234, 0.22);
  border-color: var(--eth-brand);
}

.section { padding: 68px 0; }
.section.alt { background: rgba(10, 10, 20, 0.55); }

h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  color: var(--eth-text);
}
.muted { color: var(--eth-muted); margin-top: 10px; }

sethg {
  color: var(--eth-brand-mid);
  font-weight: 600;
}

.cards {
  margin-top: 24px;
  display: grid;
  gap: 14px;
}
.cards.three { grid-template-columns: repeat(3, 1fr); }

.card {
  border: 1px solid var(--eth-border);
  border-radius: 14px;
  padding: 18px;
  background: var(--eth-surface-strong);
}
.card h3 { margin-top: 0; margin-bottom: 8px; color: var(--eth-text); }
.card p { margin: 0; color: var(--eth-muted); line-height: 1.65; }

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.panel {
  border: 1px solid var(--eth-border);
  border-radius: 14px;
  background: var(--eth-surface-strong);
  padding: 20px;
}
.panel ul { margin: 0; padding-left: 18px; }
.panel li { margin: 8px 0; color: var(--eth-muted); }
.panel-links {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.panel-links a { color: var(--eth-brand-mid); text-decoration: none; font-weight: 600; }

.faq {
  margin-top: 24px;
  display: grid;
  gap: 10px;
}

.cert-grid {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cert-grid img {
  width: auto;
  max-width: 100%;
  height: auto;
  border: 0;
  border-radius: 0;
  background: transparent;
  display: block;
}
details {
  border: 1px solid var(--eth-border);
  border-radius: 10px;
  padding: 14px 16px;
  background: var(--eth-surface-strong);
}
summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--eth-text);
}
details p {
  margin: 10px 0 0;
  color: var(--eth-muted);
  line-height: 1.7;
}

.footer {
  border-top: 1px solid var(--eth-border);
  background: rgba(8, 8, 16, 0.92);
  padding: 42px 0 22px;
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.footer h4 { margin: 0 0 10px; color: var(--eth-text); }
.footer a {
  display: block;
  margin: 6px 0;
  color: var(--eth-muted);
  text-decoration: none;
}
.footer a:hover { color: var(--eth-brand-mid); }
.social-links {
  margin-top: 12px;
  display: grid;
  gap: 8px;
}
.social-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}
.social-icon {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(98, 126, 234, 0.15);
  border: 1px solid var(--eth-border);
  transition: background .2s ease, border-color .2s ease;
}
.social-logo {
  width: 14px;
  height: 14px;
  display: block;
}
.social-links a:hover .social-icon {
  background: rgba(98, 126, 234, 0.28);
  border-color: var(--eth-brand);
}
.copyright {
  text-align: center;
  margin-top: 26px;
  color: var(--eth-muted);
  font-size: 13px;
}

@media (max-width: 920px) {
  .hero-grid, .split { grid-template-columns: 1fr; }
  .cards.three { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .menu { display: none; }
  .nav-right { width: auto; }
  .hero { padding: 32px 0 56px; }
  .cards.three, .footer-grid { grid-template-columns: 1fr; }
  .cert-grid { gap: 10px; }
  .btn { width: 100%; text-align: center; }
}