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

body {
  font-family: Arial, sans-serif;
  background-color: #000;
  color: white;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.calculation {
  font-size: clamp(24px, 5vw, 45px);
  margin-bottom: 20px;
  min-height: 60px;
  width: 100%;
  max-width: 400px;
  background-color: #1c1c1c;
  padding: 15px 20px;
  border-radius: 15px;
  text-align: right;
  word-wrap: break-word;
  overflow-wrap: break-word;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 400px;
  padding: 20px;
  background-color: #1c1c1c;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

button {
  width: 100%;
  aspect-ratio: 1;
  font-size: clamp(18px, 4vw, 24px);
  font-weight: 600;
  border: none;
  border-radius: 50%;
  background-color: #505050;
  color: white;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

button:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.4);
}

button:active {
  transform: scale(0.98);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}

button.operator {
  background-color: #fea00a;
  font-weight: bold;
}

button.operator:hover {
  background-color: #ff9500;
}


.clear-btn {
  grid-column: span 4;
  border-radius: 25px;
  background-color: #d4d4d2;
  color: #000;
  font-weight: bold;
  aspect-ratio: 4;
  max-height: 60px;
}

.clear-btn:hover {
  background-color: #e5e5e3;
}


@media (min-width: 481px) and (max-width: 768px) {
  .calculator-grid {
    max-width: 450px;
    gap: 15px;
    padding: 25px;
  }
  
  .calculation {
    max-width: 450px;
  }
}


@media (min-width: 769px) {
  body {
    padding: 40px;
  }
  
  .calculator-grid {
    max-width: 500px;
    gap: 18px;
    padding: 30px;
  }
  
  .calculation {
    max-width: 500px;
    font-size: 48px;
    min-height: 80px;
    padding: 20px 25px;
  }
  
  button {
    font-size: 26px;
  }
}


@media (max-width: 360px) {
  .calculator-grid {
    gap: 8px;
    padding: 15px;
  }
  
  body {
    padding: 10px;
  }
}