/* Animation utilities */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 10px var(--accent-primary);
    }
    50% {
        box-shadow: 0 0 20px var(--accent-primary);
    }
}

/* Apply animations */
.calculator-card {
    animation: fadeIn 0.5s ease-out;
}

.history-item {
    animation: slideIn 0.3s ease-out;
}

.calc-btn:active {
    animation: pulse 0.2s ease;
}

.mode-btn.active {
    animation: glow 2s ease-in-out infinite;
}

/* Loading state */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--accent-primary);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Button ripple effect */
.calc-btn {
    position: relative;
    overflow: hidden;
}

.calc-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.calc-btn:active::after {
    width: 300px;
    height: 300px;
}