.fraction-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.fraction {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.fraction-input {
    width: 80px;
    height: 50px;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    outline: none;
    transition: all 0.2s;
    color: #1f2937;
}

.fraction-input:focus {
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.fraction-line {
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, transparent, #4f46e5, transparent);
    border-radius: 2px;
    margin: 2px 0;
}


.operation-btn {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    transition: transform 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
}

.operation-btn:hover {
    transform: scale(1.05);
}

.operation-btn:active {
    transform: scale(0.95);
}

.btn-image {
    width: 64px;
    height: 64px;
    display: block;
    border-radius: 50%;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    transition: box-shadow 0.2s;
}

.operation-btn:hover .btn-image {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}


.result-container {
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.fraction-result {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.fraction-top, .fraction-bottom {
    display: block;
    padding: 0 20px;
    min-width: 60px;
    text-align: center;
}

.fraction-line-result {
    width: 100%;
    min-width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #4f46e5, #7c3aed, #4f46e5);
    border-radius: 2px;
}


#error-message {
    margin-top: 10px;
    padding: 8px 16px;
    background: #fee2e2;
    border-radius: 6px;
    border-left: 4px solid #ef4444;
}


@media (max-width: 768px) {
    .fraction-input {
        width: 60px;
        height: 40px;
        font-size: 1.25rem;
    }
    
    .btn-image {
        width: 48px;
        height: 48px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
}


@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

#result-display:not(.hidden),
#result-text:not(.hidden) {
    animation: fadeIn 0.3s ease-out;
}

.hidden {
    display: none !important;
}