:root {
  --background-color: oklch(0.5338 0.2503 301.37);
  --foreground-color: oklch(1 0 0);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

html,
body {
  background-color: var(--background-color);
  color: var(--foreground-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 2rem;

  header {
    padding: 1.5rem;
    box-sizing: border-box;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 15px;

    #result-display {
      min-height: 1.5rem;
      margin: 1.5rem 0;
    }

    button {
      color: var(--foreground-color);
      padding: 1rem;
      margin: 1rem;
      font-size: 1.5rem;
      border-radius: 5px;
      background-color: transparent;
      border: 1px solid rgba(255, 255, 255, 0.1);
      transition: border 0.2s ease-in-out;

      &:hover,
      &:focus {
        border: 1px solid rgba(255, 255, 255, 0.5);
        cursor: pointer;
      }
    }
  }

  main {
    width: 100%;
    padding: 1.5rem;
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 15px;

    button {
      margin: 1rem;
      font-size: 2.5rem;
      border: 1px solid rgba(255, 255, 255, 0.1);
      width: 100px;
      height: 100px;
      border-radius: 50%;
      background-color: transparent;
      transition: border 0.2s ease-in-out;

      &:hover,
      &:focus {
        border: 1px solid rgba(255, 255, 255, 0.5);
        cursor: pointer;
      }
    }
  }
}