* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Arial, sans-serif;
  background: #0d0f14;
  color: #e6e8eb;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 64px 20px 40px;
  text-align: center;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 8px;
}

.subtitle {
  color: #9aa0aa;
  margin-bottom: 40px;
}

.card {
  background: #151924;
  border-radius: 16px;
  padding: 32px 24px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.label {
  font-size: 0.9rem;
  color: #9aa0aa;
  margin-bottom: 6px;
}

.code-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

#refCode {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

button {
  padding: 6px 14px;
  border-radius: 8px;
  border: none;
  background: #3b82f6;
  color: #fff;
  cursor: pointer;
  font-size: 0.85rem;
}

button:hover {
  background: #2563eb;
}

.open-btn {
  display: inline-block;
  margin-top: 12px;
  padding: 12px 22px;
  border-radius: 12px;
  background: #22c55e;
  color: #06210f;
  text-decoration: none;
  font-weight: 600;
}

.open-btn:hover {
  background: #16a34a;
}

.note {
  margin-top: 28px;
  font-size: 0.8rem;
  color: #7c8391;
}

.footer {
  margin: 40px auto 20px;
  max-width: 720px;
  padding: 0 20px;
}