body {
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.calculator {
    background: #2e1a47;
    padding: 20px;
    border-radius: 25px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: 320px;
}

#display {
    width: 100%;
    height: 60px;
    font-size: 2rem;
    text-align: right;
    margin-bottom: 20px;
    padding: 10px;
    box-sizing: border-box;
    border: none;
    background: #4b2c7a;
    color: #fff;
    border-radius: 10px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.3);
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

button {
    height: 60px;
    border-radius: 15px;
    border: none;
    background: #5e35b1;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

button:hover {
    background: #7e57c2;
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.btn-operator {
    background: #9575cd;
}

.btn-special {
    background: #d32f2f; /* Красный для сброса */
}

.btn-equal {
    background: #b388ff;
    grid-row: span 2;
    height: 132px;
}

.btn-zero {
    grid-column: span 2;
}