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

:root {
  --main-bg-color: #708D81;
  --main-elm-color: #F4D58D;
  --secondary-elm-color: #BF0603;
}

html {
  background: var(--main-bg-color);
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

main {
  width: 100%;
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 20px;
}

h1 {
  color: #FFFFFF;
  max-width: 450px;
  width: 100%;
  text-align: center;
  text-shadow: 1px 1px 2px #001427;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  margin-bottom: 20px;
}

section {
  padding: 20px;
  margin: 15px;
  max-width: 450px;
  width: 100%;
}

#check-section {
  background: #FFFFFF;
  border-radius: 8px;
}

#check-section p {
  margin-bottom: 25px;
  text-align: center;
  font-size: clamp(0.9rem, 2.5vw, 1rem);
}

label {
  display: none;
}

.input-container {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  align-items: center;
}

input {
  border-radius: 0;
  border: none;
  border-bottom: 2px solid var(--main-elm-color);
  min-width: 200px;
  flex: 1;
  font-size: clamp(16px, 4vw, 20px);
  text-align: center;
  padding: 8px;
}

button {
  background: var(--main-elm-color);
  padding: 10px 20px;
  border: 1px solid var(--main-elm-color);
  font-weight: bold;
  cursor: pointer;
  font-size: clamp(14px, 3vw, 16px);
  transition: background-color 0.3s ease;
}

button:hover {
  background: #E6C373;
}

#output {
  margin-top: 20px;
  text-align: center;
  font-size: clamp(16px, 4vw, 20px);
  word-wrap: break-word;
}

/* Mobile-first responsive design */
@media (max-width: 480px) {
  main {
    padding: 15px;
  }
  
  section {
    padding: 15px;
    margin: 10px 0;
  }
  
  .input-container {
    flex-direction: column;
    align-items: stretch;
  }
  
  input {
    width: 100%;
    margin-bottom: 10px;
    min-width: unset;
  }
  
  button {
    width: 100%;
    padding: 12px;
  }
}

@media (max-width: 320px) {
  h1 {
    font-size: 1.3rem;
  }
  
  section {
    padding: 10px;
  }
}