:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #2a313c;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #4f9cf9;
  --accent-soft: #1f6feb33;
  --code-bg: #1c2330;
  --green: #3fb950;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

nav {
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
}
nav .brand {
  font-weight: 700;
  font-size: 17px;
  color: var(--text);
  margin-right: auto;
}
nav .brand span { color: var(--accent); }
nav a.navlink { color: var(--muted); font-size: 14px; font-weight: 500; }
nav a.navlink:hover { color: var(--text); text-decoration: none; }

.wrap { max-width: 860px; margin: 0 auto; padding: 56px 32px 96px; }

.hero { text-align: center; padding: 80px 32px 56px; }
.hero h1 { font-size: 42px; line-height: 1.15; margin: 0 0 16px; }
.hero h1 span { color: var(--accent); }
.hero p.tag { font-size: 19px; color: var(--muted); max-width: 620px; margin: 0 auto 32px; }

.btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 15px;
  margin: 6px;
}
.btn-primary { background: var(--accent); color: #06122a; }
.btn-primary:hover { text-decoration: none; opacity: 0.9; }
.btn-ghost { border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { text-decoration: none; border-color: var(--accent); }

h2 { font-size: 26px; margin: 48px 0 12px; }
h3 { font-size: 18px; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; margin: 40px 0; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 22px;
}
.card h3 { margin-top: 0; }
.card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13.5px;
}
code {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  background: var(--accent-soft);
  color: var(--text);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}
pre code { background: none; padding: 0; }

.step {
  border-left: 2px solid var(--border);
  padding: 4px 0 4px 24px;
  margin: 28px 0;
  position: relative;
}
.step::before {
  content: attr(data-n);
  position: absolute;
  left: -15px;
  top: 2px;
  width: 28px; height: 28px;
  background: var(--accent);
  color: #06122a;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px;
}
.step h3 { margin-top: 0; }

.note {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 14px;
  margin: 20px 0;
}

table.rates { width: 100%; border-collapse: collapse; margin: 16px 0; }
table.rates th, table.rates td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); font-size: 14px; }
table.rates th { color: var(--muted); font-weight: 600; }

footer {
  border-top: 1px solid var(--border);
  padding: 28px 32px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}