:root {
  color-scheme: light;
  --bg: #f7f7f8;
  --card: #ffffff;
  --text: #16181d;
  --muted: #616774;
  --border: #dfe3ea;
  --primary: #155eef;
  --primary-dark: #0f49bd;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.5;
}

.shell {
  width: min(720px, calc(100vw - 32px));
  margin: 48px auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.2;
}

.muted,
.small {
  color: var(--muted);
}

.small {
  font-size: 14px;
}

.error {
  border: 1px solid #f2b8b5;
  border-radius: 10px;
  background: #fff5f5;
  color: var(--danger);
  padding: 10px 12px;
}

.form {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-weight: 600;
}

input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  font: inherit;
  padding: 12px 14px;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 12px 18px;
  text-decoration: none;
}

button:hover,
.button:hover {
  background: var(--primary-dark);
}

button.secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.topline {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.choice {
  display: grid;
  gap: 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}

.choice strong {
  font-size: 28px;
}

dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 14px;
  margin: 24px 0;
}

dt {
  color: var(--muted);
  font-weight: 700;
}

dd {
  margin: 0;
  word-break: break-word;
}

@media (max-width: 640px) {
  .shell {
    margin: 20px auto;
    width: min(100vw - 20px, 720px);
  }

  .card {
    padding: 20px;
  }

  .choices,
  .topline {
    grid-template-columns: 1fr;
    display: grid;
  }
}