:root {
  --green-200: hsl(148, 38%, 91%);
  --green-600: hsl(169, 82%, 27%);
  --red: hsl(0, 66%, 54%);
  --grey-500: hsl(186, 15%, 59%);
  --grey-900: hsl(187, 24%, 22%);
  --white: hsl(0, 0%, 100%);
  font-family: "Karla", sans-serif;
  font-size: 16px;
}

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

body {
  margin: 0;
  background: var(--green-200);
  padding: 2rem;
  min-height: 100vh;
  display: flex;
}

.container {
  margin: auto;
  width: 100%;
  max-width: 700px;
  background: var(--white);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

h1 {
  margin-bottom: 1rem;
  color: var(--grey-900);
}

.form-group {
  margin-bottom: 1.5rem;
}

label,
p {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--grey-900);
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--grey-500);
  border-radius: 0.5rem;
  outline: none;
}

input[type="radio"],
input[type="checkbox"] {
  margin-right: 0.5rem;
}

textarea {
  resize: none;
}

.form-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.form-row .form-group {
  flex: 1;
  min-width: 150px;
}

button {
  width: 100%;
  padding: 1rem;
  background-color: var(--green-600);
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: hsl(169, 82%, 20%);
}

.radio-group {
  display: flex;
  gap: 1rem;
  justify-content: flex-start;
  width: 100%;
}

.radio-box {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid var(--grey-500);
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
  width: 100%;
}

/* Make radio circle green */
input[type="radio"] {
  accent-color: var(--green-600);
}

/* Highlight selected radio */
.radio-box input[type="radio"]:checked + span,
.radio-box input[type="radio"]:checked {
  border-color: var(--green-600);
}

/* Optional hover effect */
.radio-box:hover {
  border-color: var(--green-600);
}

.error {
  color: var(--red);
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: none;
}

.success {
  background: var(--green-200);
  padding: 1rem;
  border-radius: 0.5rem;
  color: var(--green-600);
  font-weight: bold;
  margin-bottom: 1rem;
}

.hidden {
  display: none;
}

.attribution {
  font-size: 11px;
  text-align: center;
}

.attribution a {
  color: hsl(228, 45%, 44%);
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1.5rem;
  }

  .radio-group {
    display: flex;
    flex-direction: column; /* Stack the radio buttons vertically */
  }

  .radio-box {
    width: 100%; /* Make each radio box take full width on mobile */
  }
}