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

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

:root {
  --clr-green-200: hsl(148, 38%, 91%);
  --clr-green-600: hsl(169, 82%, 27%);
  --clr-red: hsl(0, 66%, 54%);
  --clr-white: hsl(0, 0%, 100%);
  --clr-grey-500: hsl(186, 15%, 59%);
  --clr-grey-900: hsl(187, 24%, 22%);
  --radius: 0.5rem;
  --transition: 0.2s ease-in-out;
}

body {
  font-family: "Karla", sans-serif;
  background-color: var(--clr-green-200);
  color: var(--clr-grey-900);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

form {
  background: var(--clr-white);
  border-radius: var(--radius);
  max-width: 500px;
  width: 100%;
  padding: 2rem;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
}

h1 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-weight: 700;
}

label, legend {
  font-weight: 700;
  display: block;
  margin-bottom: 0.5rem;
}

input,
textarea,
select {
  width: 100%;
  padding: 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--clr-grey-500);
  font: inherit;
  margin-bottom: 1rem;
  transition: border var(--transition), box-shadow var(--transition);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--clr-green-600);
  box-shadow: 0 0 0 3px hsla(169, 82%, 27%, 0.2);
}

fieldset {
  border: none;
  margin-bottom: 1rem;
}

fieldset div {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

input[type="radio"],
input[type="checkbox"] {
  accent-color: var(--clr-green-600);
}

.error-message {
  color: var(--clr-red);
  font-size: 0.875rem;
  margin-top: -0.5rem;
  margin-bottom: 1rem;
}

button {
  background: var(--clr-green-600);
  color: var(--clr-white);
  border: none;
  padding: 0.9rem 1.2rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 700;
  transition: background var(--transition);
  width: 100%;
}

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

.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--clr-grey-900);
  color: var(--clr-white);
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s ease;
  font-weight: 700;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.attribution {
  font-size: 11px;
  text-align: center;
  margin-top: 2rem;
  color: var(--clr-grey-500);
}

.attribution a {
  color: var(--clr-green-600);
}

@media (min-width: 768px) {
  form {
    padding: 2.5rem 3rem;
  }
}