* {
  box-sizing: border-box;
}

body {
  font-family: system-ui, sans-serif;
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px;
  line-height: 1.4;
  background: #fafafa;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

h2 {
  font-size: 1.3rem;
  margin-top: 24px;
}

a {
  color: #0645ad;
}

input,
button,
select {
  width: 100%;
  font-size: 16px;
  padding: 12px;
  margin: 6px 0;
}

button {
  cursor: pointer;
  border: 1px solid #ccc;
  border-radius: 8px;
  background: white;
}

button:active {
  transform: scale(0.99);
}

pre {
  background: #f0f0f0;
  padding: 12px;
  overflow: auto;
  border-radius: 8px;
  white-space: pre-wrap;
  word-break: break-word;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin-top: 16px;
  background: white;
}

th,
td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: left;
  font-size: 14px;
}

.card {
  background: white;
  border: 1px solid #ddd;
  padding: 16px;
  margin: 16px 0;
  border-radius: 12px;
}

.challenge {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 2px;
  word-break: break-word;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

@media (min-width: 700px) {
  body {
    padding: 32px;
  }

  input,
  button,
  select {
    width: auto;
    min-width: 180px;
  }

  .card {
    padding: 20px;
  }
}

@media (max-width: 699px) {
  table {
    min-width: 650px;
  }

  h1 {
    font-size: 1.5rem;
  }

  .challenge {
    font-size: 1.6rem;
  }
}