body {
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    min-height: 100vh;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calculator {
    width: 320px;
    padding: 20px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

#display {
    width: 100%;
    height: 60px;
    margin-bottom: 15px;
    font-size: 24px;
    text-align: right;
    padding: 10px;
    box-sizing: border-box;
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 8px;
    color: #333;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

button {
    padding: 15px;
    font-size: 18px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    background-color: rgba(255, 255, 255, 0.9);
    color: #333;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

button:hover {
    background-color: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.operator {
    background-color: #4a90e2;
    color: white;
}

.operator:hover {
    background-color: #357abd;
}

.equals {
    background-color: #2ecc71;
    color: white;
}

.equals:hover {
    background-color: #27ae60;
}

button:active {
    transform: translateY(1px);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}