/* Reset Default Space */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

/* for body */
body {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;

  /* background: linear-gradient(270deg, #00c6ff, #0072ff, #396afc, #00c6ff); */
  background: linear-gradient(270deg, #00e0ff, #0084ff, #0059ff, #00e0ff);
  background-size: 600% 600%;
  animation: gradientMove 10s ease infinite;
}

/* Gradient animation */
@keyframes gradientMove {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* for calculator */
div.calculator {
  background-color: aqua;
  border: 1px solid #717377;
  padding: 20px;
  border-radius: 16px;
  background: transparent;
  box-shadow: 0px 3px 15px rgba(113, 115, 119, 0.5);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* For Responsiveness of Mobile */
@media (max-width: 480px) {
  body {
    align-items: flex-end; 
  }

  div.calculator {
    width: 100%;
    border-radius: 30px 30px 0 0; 
    padding: 20px 10px 40px 10px; /* added padding for thumb safety */
  }

  button {
    width: auto;      /* Override fixed width */
    flex: 1;          /* Grow to fill row */
    height: 70px;     /* Comfortable touch height */
    margin: 5px;      /* Tighter spacing for mobile */
    border-radius: 12px; /* Slightly more modern look for mobile */
  }

  input {
    font-size: 3rem;  /* Make numbers bigger on phone screens */
    margin-bottom: 20px;
  }
}



/* for input box */
input {
  width: 320px;
  border: none;
  outline: none;
  padding: 24px;
  margin: 10px;
  background: transparent;
  box-shadow: 0px 3px 15px rgba(84, 84, 84, 0.1);
  font-size: 40px;
  text-align: right;
  cursor: pointer;
  color: #fff;
  /* Inset shadow makes it look like it's carved into the glass */
  box-shadow:
    inset 2px 2px 5px rgba(0, 0, 0, 0.1),
    inset -2px -2px 5px rgba(255, 255, 255, 0.1);
}

/* For input placeholder */
input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

/* For button */
button {
  border: none;
  width: 60px;
  height: 60px;
  margin: 10px;
  border-radius: 60px;
  background: transparent;
  color: #ffffff;
  font-size: 20px;
  box-shadow: -8px -8px 15px rgba(255, 255, 255, 0.1);
  cursor: pointer;
}
/* when hover */
button:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(1.05);
  transition: 0.2s;
}

/* when active */
button:active {
  transform: scale(0.95); /* Shrinks slightly when clicked */
}

/* For Equal Button */
button.equalBtn {
  background-color: #fb7c14;
}

/* For Operator */
button.operator {
  color: #6dee0a;
  background-color: #2b02334d;
}