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

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Quicksand", sans-serif;
}

:root {
  --bg-color: #f0f4f8;
  --primary: #6c63ff;
  --secondary: #ff6584;
  --accent: #4cd7b0;
  --text: #333;
  --button-bg: #ffffff;
  --button-hover: #e0e0e0;
}

body {
  background-color: var(--bg-color);
  color: var(--text);
  height: 100vh;
  width: 100vw;
  display: flex;
  align-items: center;
  justify-content: center;
}

.calculator {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  border: 3px solid var(--accent);
  background-color: #ffffff;
  display: flex;
  flex-direction: column;
  border-radius: 20px;
  padding: 20px;
  width: 400px;
}

.screen {
  display: flex;
  flex-direction: column;
  width: 100%;
  font-size: 40px;
  padding: 20px;
  background-color: var(--bg-color);
  border-radius: 10px;
  margin-bottom: 15px;
}

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

.row2 {
  grid-column: span 2;
}

.operator {
  font-size: 24px;
  color: var(--secondary);
}

.currentNumber,
.previousNumber {
  height: 40px;
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

button {
  cursor: pointer;
  font-size: 24px;
  padding: 20px;
  background-color: var(--button-bg);
  border: 2px solid var(--primary);
  border-radius: 12px;
  color: var(--primary);
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: var(--button-hover);
}

button:active {
  transform: scale(0.95);
}