:root {
  --bg: #f5f7fb; --card: #ffffff; --text: #111827; --muted: #6b7280;
  --accent: #1f63ee; --accent-text: #ffffff; --border: #e5e7eb; --code-bg: #eef2ff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17; --card: #151b26; --text: #f3f4f6; --muted: #9ca3af;
    --accent: #3b7bff; --border: #263041; --code-bg: #1c2433;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px 16px; background: var(--bg); color: var(--text);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main {
  width: 100%; max-width: 420px; background: var(--card); border: 1px solid var(--border);
  border-radius: 24px; padding: 32px 24px; text-align: center;
}
.icon { width: 88px; height: 88px; border-radius: 20px; }
h1 { font-size: 26px; line-height: 1.2; margin: 16px 0 8px; }
p { margin: 0 0 16px; color: var(--muted); }
.button {
  display: block; width: 100%; padding: 14px 16px; margin-top: 12px; border-radius: 14px;
  font-weight: 600; text-decoration: none; border: 1px solid transparent; font-size: 17px; cursor: pointer;
}
.primary { background: var(--accent); color: var(--accent-text); }
.secondary { background: transparent; color: var(--accent); border-color: var(--border); }
.steps { text-align: left; margin: 24px 0 0; padding: 0 0 0 20px; color: var(--muted); }
.steps li { margin-bottom: 6px; }
.code {
  margin: 8px 0 0; padding: 12px; border-radius: 12px; background: var(--code-bg);
  font: 600 15px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; word-break: break-all; color: var(--text);
}
footer { margin-top: 28px; font-size: 13px; color: var(--muted); }
footer a { color: var(--muted); }