body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #667eea, #764ba2);
    font-family: 'Segoe UI', sans-serif;
}

.calculator {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    padding: 25px;
    border-radius: 20px;
    width: 320px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s ease;
}

.calculator:hover {
    transform: scale(1.03);
}

.brand {
    text-align: center;
    color: white;
    font-size: 18px;
    margin-bottom: 15px;
    letter-spacing: 2px;
}

#display {
    width: 100%;
    height: 60px;
    margin-bottom: 15px;
    font-size: 24px;
    text-align: right;
    padding: 10px;
    border: none;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

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

button {
    height: 55px;
    font-size: 20px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    transition: all 0.2s ease;
}

button:hover {
    background: white;
    color: #764ba2;
    transform: translateY(-3px);
}

.operator {
    background: rgba(255, 255, 255, 0.3);
}

#equals {
    background: #ff6b81;
}