/* Reset some basics */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui,-apple-system,BlinkMacSystemFont,sans-serif;
  line-height: 1.5;
  background: #f5f7fa;
  color: #1f2d3a;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 1rem;
}

header {
  text-align: center;
  margin-bottom: 1rem;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.25rem;
}

main {
  flex: 1;
  display: grid;
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
}

.card {
  background: #ffffff;
  border-radius: 12px;
  padding: 1rem 1.25rem;
  box-shadow: 0 8px 24px rgba(31,45,58,0.06);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

button {
  cursor: pointer;
  padding: 0.6rem 1rem;
  border: none;
  border-radius: 8px;
  background: #6366f1;
  color: white;
  font-weight: 600;
  font-size: 0.95rem;
  transition: filter .2s;
}

button:hover {
  filter: brightness(1.1);
}

input {
  padding: 0.5rem;
  border: 1px solid #d1d9e6;
  border-radius: 6px;
  font-size: 0.9rem;
  width: 100%;
  margin-bottom: 0.5rem;
}

label {
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
  display: block;
}

pre {
  background: #f0f4fa;
  padding: 0.75rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.8rem;
}

footer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.75rem;
  color: #555;
}