:root {
  --size-xxs: 0.625rem; /* 10px */
  --size-xs: 0.75rem; /* 12px */
  --size-sm: 0.875rem; /* 14px */
  --size-base: 1rem; /* 16px */
  --size-lg: 1.125rem; /* 18px */
  --size-xl: 1.25rem; /* 20px */
  --size-2xl: 1.5rem; /* 24px */
  --size-3xl: 1.875rem; /* 30px */
  --size-4xl: 2.25rem; /* 36px */
  --size-5xl: 3rem; /* 48px */
  --size-6xl: 4rem; /* 64px */
  --size-7xl: 5rem; /* 80px */
  --size-8xl: 6rem; /* 96px */
  --size-9xl: 8rem; /* 120px */
  --size-10xl: 9rem; /* 144px */

  /* Colors */
  --clr-btn: #3b82f6;
  --clr-btn-hover: #1d4ed8;
  --clr-heading: #1d4ed8;
  --clr-paragraph: #1e293b;
  --txt-btn: #fafafa;
  --txt-h3: #dc2626;
}

body {
  font-family: Arial, Helvetica, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #e2e8f0;
}

h1 {
  color: var(--clr-heading);
  text-align: center;
  font-size: var(--size-2xl);
}

h3 {
  text-align: center;
  color: var(--txt-h3);
}

p {
  color: var(--clr-paragraph);
  text-align: center;
  padding-left: 10px;
  padding-right: 10px;
  font-size: var(--size-base);
}

.btn {
  display: inline-block;
  width: fit-content;
  padding: 10px;
  border-radius: 5px;
  font-size: var(--size-sm);
  border-color: transparent;
  color: var(--txt-btn);
  font-weight: 600;
  background-color: var(--clr-btn);
  cursor: pointer;
}

.btn:hover {
  background-color: var(--clr-btn-hover);
  transform: translateY(-2px);
  transition: transform 0.3s;
}

body {
  /* height: 150vh; */
  margin: 0;
}

.container {
  display: grid;
  grid-template-rows: repeat(9, 1fr);
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  margin: auto;
}

.item {
  padding: 2px;
  text-align: center;
}

input {
  color: #3b82f6;
  width: 22px;
  height: 22px;
  box-sizing: border-box;
  border: none;
  box-shadow: 0 0 2px #172554;
  background: transparent;
  font-size: 1rem;
  text-align: center;
}
.box {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.buttons {
  display: flex;
  gap: 10px;
  justify-content: center;
}

@media (min-width: 475px) {
  h1 {
    font-size: var(--size-3xl);
  }

  p {
    font-size: var(--size-lg);
  }
  .btn {
    font-size: var(--size-base);
  }
  input {
    width: 32px;
    height: 32px;
    box-sizing: border-box;
    border: none;
    font-size: 1.5rem;
    text-align: center;
  }
}
@media (min-width: 768px) {
  h1 {
    font-size: var(--size-4xl);
  }

  p {
    font-size: var(--size-xl);
  }
  .btn {
    font-size: var(--size-lg);
  }
  input {
    width: 40px;
    height: 40px;
    box-sizing: border-box;
    border: none;
    font-size: 2rem;
    text-align: center;
  }
}