/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Karla:wght@400;700&display=swap');

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

/* Variables */
:root {
  /* Primary Colors */
  --green-200: hsl(148, 38%, 91%);
  --green-600: hsl(169, 82%, 27%);
  --red: hsl(0, 66%, 54%);

  /* Neutral Colors */
  --white: hsl(0, 0%, 100%);
  --grey-500: hsl(186, 15%, 59%);
  --grey-900: hsl(187, 24%, 22%);

  /* Font */
  --font-family: 'Karla', sans-serif;
  --font-size-label: 16px;
}

body {
  font-family: var(--font-family);
  background-color: var(--green-200);
  color: var(--grey-900);
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 2rem 1rem;
}

.container {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--white);
  border-radius: 10px;
  padding: 2rem;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

h1 {
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--grey-900);
  text-align: center;
}

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

label {
  display: block;
  font-size: var(--font-size-label);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--grey-500);
  border-radius: 5px;
  font-family: var(--font-family);
  font-size: var(--font-size-label);
  transition: border-color 0.3s;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--green-600);
  box-shadow: 0 0 0 2px rgba(0, 128, 128, 0.1);
}

.error input,
.error select,
.error textarea {
  border-color: var(--red);
}

.error-message {
  color: var(--red);
  font-size: 14px;
  margin-top: 0.25rem;
  display: none;
}

.error .error-message {
  display: block;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.checkbox-group input {
  width: auto;
  margin-top: 0.25rem;
}

.checkbox-group label {
  font-weight: 400;
}

button {
  background-color: var(--green-600);
  color: var(--white);
  border: none;
  border-radius: 5px;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-family);
  font-size: var(--font-size-label);
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.3s;
  width: 100%;
}

button:hover {
  background-color: hsl(169, 82%, 22%);
}

button:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 128, 128, 0.3);
}

.success-message {
  background-color: var(--white);
  border-radius: 10px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  display: none;
}

.success-message h2 {
  color: var(--green-600);
  margin-bottom: 1rem;
}

.success-message p {
  margin-bottom: 1.5rem;
}

.attribution {
  margin-top: 2rem;
  font-size: 11px;
  text-align: center;
}

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

/* Screen reader only class */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Responsive styles */
@media (min-width: 768px) {
  body {
    padding: 4rem 2rem;
  }

  .container {
    padding: 3rem;
  }

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

  .form-row .form-group {
    flex: 1;
  }
}