* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f4f6f8;

  display: flex;
  justify-content: center;
  align-items: center;

  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 750px;
  text-align: center;
}

h1 {
  margin-bottom: 1.5rem;
  color: #1f2937;
}

form {
  background-color: #ffffff;
  padding: 2rem;
  border-radius: 10px;

  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  text-align: left;
}

fieldset {
  border: 1px solid #d1d5db;
  border-radius: 6px;
  padding: 1.2rem;
  margin-bottom: 1.5rem;
}

legend {
  font-weight: bold;
  padding: 0 0.5rem;
  color: #111827;
}

label {
  display: block;
  margin-top: 0.9rem;
  font-size: 0.95rem;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.5rem;
  font-size: 0.95rem;

  border: 1px solid #cbd5e1;
  border-radius: 4px;
}

input[type="radio"],
input[type="checkbox"] {
  width: auto;
  margin-right: 0.4rem;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: #4f46e5;
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.2);
}

input:required:invalid {
  border-color: #dc2626;
}

input:required:valid {
  border-color: #16a34a;
}

button {
  width: 100%;
  margin-top: 1rem;
  padding: 0.8rem;

  font-size: 1rem;
  color: white;
  background-color: #4f46e5;

  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover {
  background-color: #4338ca;
}