:root {
  color-scheme: dark;
  --bg: #0b0e14;
  --bg-alt: #0e121b;
  --card: #12161f;
  --border: #232838;
  --text: #f5f6fa;
  --subtext: #9aa3b5;
  --muted: #6b7386;
  --primary: #4c8dff;
  --primary-dark: #2f6fe0;
  --beta: #eab308;
  --radius: 16px;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", Helvetica, Arial, sans-serif;
}

body {
  overflow-x: hidden;
}

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

.container-narrow {
  max-width: 720px;
}

.muted { color: var(--muted); }

code {
  background: rgba(76, 141, 255, 0.12);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 0.9em;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
}

.brand-mark { font-size: 20px; }

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--subtext);
  text-decoration: none;
  font-size: 14px;
}

.nav-links a:hover { color: var(--text); }

@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 13px 24px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.btn:hover { opacity: 0.9; }
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-outline:hover { border-color: var(--primary); }

.btn-small {
  padding: 8px 18px;
  font-size: 14px;
}

.btn-block { width: 100%; }

.btn-disabled {
  opacity: 0.45;
  pointer-events: none;
}

/* Hero */
.hero {
  padding: 96px 0 64px;
  text-align: center;
  background:
    radial-gradient(60% 60% at 50% 0%, rgba(76, 141, 255, 0.16), transparent);
}

.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--subtext);
  font-size: 13px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 44px;
  line-height: 1.25;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.lead {
  color: var(--subtext);
  font-size: 17px;
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto 32px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.hero-note {
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 640px) {
  .hero { padding: 64px 0 48px; }
  .hero h1 { font-size: 32px; }
}

/* Sections */
.section {
  padding: 88px 0;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section h2 {
  font-size: 30px;
  text-align: center;
  margin: 0 0 12px;
}

.section-lead {
  color: var(--subtext);
  text-align: center;
  max-width: 620px;
  margin: 0 auto 48px;
  line-height: 1.6;
}

@media (max-width: 640px) {
  .section { padding: 56px 0; }
  .section h2 { font-size: 24px; }
}

/* Grid / cards */
.grid {
  display: grid;
  gap: 20px;
}

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

@media (max-width: 860px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .grid-3 { grid-template-columns: 1fr; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.card-icon {
  font-size: 28px;
  margin-bottom: 14px;
}

.card h3 {
  font-size: 17px;
  margin: 0 0 10px;
}

.card p {
  color: var(--subtext);
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
}

.badge-beta {
  display: inline-block;
  vertical-align: middle;
  margin-left: 6px;
  padding: 2px 9px;
  border-radius: 999px;
  background: rgba(234, 179, 8, 0.14);
  color: var(--beta);
  font-size: 11px;
  font-weight: 700;
}

/* Chains */
.chain-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.chain-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 14px;
}

.chain-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.chain-note {
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

@media (max-width: 780px) {
  .steps { grid-template-columns: 1fr; gap: 28px; }
}

.step { text-align: center; }

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(76, 141, 255, 0.14);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.step p {
  color: var(--subtext);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
  max-width: 280px;
  margin-left: auto;
  margin-right: auto;
}

/* FAQ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px 20px;
}

.faq-item summary {
  cursor: pointer;
  padding: 16px 0;
  font-weight: 600;
  font-size: 15px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  color: var(--muted);
  font-size: 20px;
  font-weight: 400;
  margin-left: 12px;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  color: var(--subtext);
  font-size: 14px;
  line-height: 1.7;
  margin: 0 0 18px;
}

/* Download */
.download-grid {
  max-width: 820px;
  margin: 0 auto;
}

.download-card {
  text-align: center;
}

.download-card h3 {
  margin-top: 4px;
}

.download-card .muted {
  font-size: 13px;
  margin: 0 0 18px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-weight: 700;
}

.footer-brand .muted {
  font-weight: 400;
  font-size: 13px;
}

.footer-links {
  display: flex;
  gap: 20px;
}

.footer-links a {
  color: var(--subtext);
  text-decoration: none;
  font-size: 14px;
}

.footer-links a:hover { color: var(--text); }

.footer-copy {
  font-size: 13px;
  width: 100%;
  text-align: center;
  margin: 0;
}

@media (min-width: 720px) {
  .footer-copy { width: auto; text-align: right; }
}