:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --bg: #ffffff;
  --surface: #f5f6ff;
  --text: #111827;
  --muted: #4b5563;
  --border: #e5e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #a5b4fc;
    --primary-dark: #c7d2fe;
    --bg: #0f1020;
    --surface: #181a33;
    --text: #f3f4f6;
    --muted: #b6bac8;
    --border: #2a2d4a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--primary); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header.site { border-bottom: 1px solid var(--border); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 800; font-size: 1.25rem; color: var(--text); text-decoration: none; letter-spacing: -0.02em; }
.brand img { display: block; border-radius: 8px; }
.brand span { color: var(--primary); }
nav.site a { margin-left: 16px; font-size: 0.95rem; text-decoration: none; }
nav.site a:hover { text-decoration: underline; }
main { padding: 40px 0 64px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, li { color: var(--muted); }
li { margin: 4px 0; }
.meta { font-size: 0.875rem; margin-bottom: 24px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; margin: 24px 0; }
.code {
  font: 700 2rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.2em; text-align: center; color: var(--text); margin: 8px 0 16px;
}
.btn {
  display: inline-block; min-height: 48px; padding: 12px 20px; border-radius: 12px; border: 0;
  background: var(--primary); color: #fff; font: 600 1rem/1.4 inherit; text-decoration: none; cursor: pointer;
}
@media (prefers-color-scheme: dark) { .btn { color: #0f1020; } }
.btn.secondary { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.pending { background: #fef3c7; color: #78350f; padding: 0 4px; border-radius: 4px; }
footer.site { border-top: 1px solid var(--border); padding: 24px 0; font-size: 0.875rem; color: var(--muted); }
footer.site a { margin-right: 16px; }