:root {
  --bg: #0f1115;
  --fg: #e8e8e8;
  --muted: #8a8f99;
  --card: #181b22;
  --accent: #25d366;
  --border: #262a33;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}
main.centered {
  max-width: 480px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.signup {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 14px;
}
.signup input,
.signup button {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-family: inherit;
}
.signup input {
  background: #0b0d11;
  color: var(--fg);
}
.signup input:focus {
  outline: none;
  border-color: var(--accent);
}
.signup button {
  background: var(--accent);
  color: #06170c;
  font-weight: 600;
  border: none;
  cursor: pointer;
}
.signup button:hover { filter: brightness(1.05); }
header { margin-bottom: 32px; }
h1 { font-size: 2.4rem; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 1.2rem; margin: 0 0 12px; }
h3 { font-size: 1rem; margin: 16px 0 8px; color: var(--muted); }
.tag { color: var(--muted); margin: 0; font-size: 1.05rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 24px;
  margin-bottom: 18px;
}
.muted { color: var(--muted); font-size: 0.92rem; }
.cta { text-align: center; }
.cta .wa { font-size: 1.4rem; margin: 8px 0 4px; }
.cta a { color: var(--accent); text-decoration: none; font-weight: 600; }
.cta a:hover { text-decoration: underline; }
ol { padding-left: 20px; }
ol li { margin-bottom: 6px; }
pre {
  background: #0b0d11;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.85rem;
}
code { font-family: "SF Mono", Menlo, Consolas, monospace; }
footer { text-align: center; margin-top: 32px; }