* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: Poppins, sans-serif;
  background: #f4f6f9;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}
.card {
  background: #fff;
  max-width: 480px;
  width: 100%;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
}
h1 {
  margin: 0 0 8px;
}
p {
  color: #666;
}
input,
select,
button {
  width: 100%;
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 10px;
  font-size: 16px;
}
button {
  background: #2563eb;
  color: #fff;
  border: none;
  cursor: pointer;
}
button:hover {
  opacity: 0.95;
}
.row {
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
  gap: 10px;
  margin: 15px 0;
}
.buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.result {
  margin-top: 20px;
  padding: 15px;
  background: #eef6ff;
  border-radius: 10px;
  font-weight: 600;
}
ul {
  padding-left: 18px;
}
@media (max-width: 500px) {
  .row {
    grid-template-columns: 1fr;
  }
  .buttons {
    grid-template-columns: 1fr;
  }
}