@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap");

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

:root {
  --white: #fff;
  --bg: #eaeaea;
  --black: #000;
  --primary-bg-color: #cfcdcd;
  --equal-btn-color: #2980b9;
  /* Operator colors */
  --op1: #ff5733;
  --op2: #33ff57;
  --op3: #3357ff;
  --op4: #862a5f;
  --op5: #ffc133;
  /* btn colors */
  --light-color: #708090;
  --clr-color: #b22222;
  --del-color: #2f4f4f;
}

body {
  font-family: "Poppins", sans-serif !important;
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: var(--primary-bg-color);
  transition: background-color 0.3s, color 0.3s;
  user-select: none;
}

.note {
  width: 330px;
}

.calculator {
  width: 330px;
  background-color: var(--bg);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
  border-radius: 15px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  overflow: hidden;
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.display {
  width: 100%;
  margin-bottom: 20px;
}

#display {
  width: 100%;
  height: 50px;
  font-size: 2rem;
  text-align: right;
  padding: 10px;
  border: 1px solid rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  background-color: var(--primary-bg-color);
  color: var(--black);
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  width: 100%;
}

.btn {
  /* background-color: transparent; */
  width: 60px;
  height: 60px;
  color: var(--black);
  border: none;
  box-shadow: 2px 2px 3px rgba(0, 0, 0, 0.4);
  font-size: 1.2rem;
  padding: 20px;
  border-radius: 10000px;
  transition: 0.3s;
  display: flex;
  justify-content: center;
  align-items: center;

  &:hover {
    color: var(--white);
    box-shadow: 2px 2px 3px var(--btn-col);
    background-color: var(--btn-col);
    border: 1px solid var(--black);
  }
}

.operator {
  font-size: 1.6rem;

  &:hover {
    font-weight: 600;
    color: var(--white);
    background-color: var(--op);
    border: 1px solid var(--black);
    box-shadow: 1px 2px 3px var(--op);
  }
}

.equal {
  color: var(--equal-btn-color) !important;
  font-size: 2rem;
  background: transparent !important;
  box-shadow: 2px 2px 3px var(--equal-btn-color);
  border: 1px solid var(--white);
  &:hover {
    box-shadow: 0px 0px 4px var(--equal-btn-color);
    border: none !important;
  }
}

.btn:active {
  transform: scale(0.95);
}

.note p.desktop {
  display: none;
}
/* Responsiveness */

@media (max-width: 900px) {
  .note p.mobile {
    display: none;
  }
  .note p.desktop {
    display: block;
  }
}