:root {
  --bg: #0f172a;
  --card: #1e293b;
  --accent: #38bdf8;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --ok: #4ade80;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  line-height: 1.7;
  padding: 40px 16px;
}
.wrap { max-width: 820px; margin: 0 auto; }
header { text-align: center; margin-bottom: 30px; }
header h1 { font-size: 26px; }
header p { color: var(--muted); margin-top: 10px; font-size: 14px; }
.badge {
  display: inline-block; margin-top: 14px; padding: 4px 14px;
  border-radius: 999px; font-size: 13px; color: #052e16;
  background: var(--muted);
}
.badge.ok { background: var(--ok); }
.grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px; margin-bottom: 24px;
}
.card {
  background: var(--card); border: 1px solid #334155;
  border-radius: 14px; padding: 20px;
}
.card h2 { font-size: 17px; color: var(--accent); margin-bottom: 10px; }
.card p, .card li { font-size: 14px; color: var(--muted); }
.card ol, .card ul { padding-left: 18px; }
.card code {
  background: #0f172a; padding: 1px 6px; border-radius: 5px;
  font-size: 13px; color: #fbbf24;
}
.note {
  background: rgba(56, 189, 248, .08); border-left: 3px solid var(--accent);
  border-radius: 8px; padding: 13px 17px; font-size: 14px; margin-bottom: 24px;
}
.action { text-align: center; margin-bottom: 24px; }
.action button {
  padding: 10px 30px; border: none; border-radius: 8px;
  background: var(--accent); color: #052e16; font-size: 15px; font-weight: 600;
  cursor: pointer;
}
.action button:hover { filter: brightness(1.1); }
#msg { margin-top: 12px; color: var(--ok); font-weight: 600; min-height: 1.5em; }
footer {
  text-align: center; color: var(--muted); font-size: 13px;
  border-top: 1px solid #334155; padding-top: 16px;
}