:root {
  color-scheme: light;
  font-family:
    Inter, Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f6f7f9;
  color: #111827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
}

.shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(100%, 360px);
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  background: #ffffff;
  padding: 20px;
  box-shadow: 0 18px 44px rgba(17, 24, 39, 0.08);
  text-align: center;
}

.actions {
  display: grid;
  gap: 10px;
}

button,
a {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}

button {
  border: 0;
  background: #111827;
  color: #ffffff;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

a {
  border: 1px solid #d1d5db;
  color: #111827;
}