.calculator-container {
    max-width: 400px;
    padding: var(--spacing-md);
}

.calculator {
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.display {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-md);
    text-align: right;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    min-height: 120px;
    word-wrap: break-word;
    word-break: break-all;
}

.previous-operand {
    color: var(--text-muted);
    font-size: 1.2rem;
    min-height: 1.5rem;
}

.current-operand {
    color: var(--text-color);
    font-size: 2.5rem;
    font-weight: 600;
}

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

.btn-calc {
    height: 80px;
    font-size: 1.5rem;
    background: var(--card-bg);
    color: var(--text-color);
    border: none;
    cursor: pointer;
    transition: background-color 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-calc:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-calc:active {
    background: rgba(255, 255, 255, 0.2);
}

.btn-operator {
    color: var(--accent-color);
    font-weight: 600;
}

.btn-action {
    color: var(--danger-color);
    font-weight: 600;
}

.btn-equal {
    background: var(--primary-color);
    color: white;
}

.btn-equal:hover {
    background: var(--primary-hover);
}

.zero {
    grid-column: span 2;
}