:root {
  --accent: #1976d2;
  --ok: #2e7d32;
  --err: #c62828;
  --muted: #8a94a6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(135deg, #eef2f7 0%, #e3e9f2 100%);
  color: #1f2937;
}

.card {
  width: 100%;
  max-width: 460px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(30, 50, 90, 0.12);
  padding: 40px 36px;
  text-align: center;
}

h1 {
  margin: 0 0 4px;
  font-size: 24px;
  letter-spacing: -0.02em;
}

.muted { color: var(--muted); font-weight: 400; }

.subtitle { color: var(--muted); margin: 0 0 28px; font-size: 14px; }

.status {
  background: #f7f9fc;
  border-radius: 10px;
  padding: 16px;
  margin: 0 0 20px;
  font-size: 15px;
  line-height: 1.5;
}

.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
}

.dot.ok { background: var(--ok); }
.dot.err { background: var(--err); }

.small { font-size: 12px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 13px 26px;
  border-radius: 10px;
  font-size: 15px;
  transition: background 0.15s ease;
}

.btn:hover { background: #1565c0; }

.banner {
  margin-top: 20px;
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 14px;
}

.banner.ok { background: #e8f5e9; color: var(--ok); }
.banner.err { background: #ffebee; color: var(--err); }

.hidden { display: none; }

.hint {
  margin-top: 28px;
  font-size: 12px;
  color: var(--muted);
}

code { background: #f1f3f6; padding: 2px 5px; border-radius: 4px; }