.content {
    width: calc(100% - 2rem);
    max-width: calc(60rem - 1rem);
    padding: 0.75rem 0;
    margin: auto;
}

.content img {
    width: 100%;
    margin: auto;
    display: block;
}

#popular_science h3 {
    color: var(--supplementary-grass-green);
    text-align: center;
    margin: 1.875rem auto;
    font-size: 1.5rem;
    font-weight: 700;
}

#knowledge_block,
#simple_wood {
    list-style: none;
    margin: 0;
    padding: 0;
}

#knowledge_block li {
    border-bottom: lightgray solid 1px;
    margin-bottom: 2.75rem;
    padding-bottom: 0.625rem;
}

#knowledge_block .block_title::after {
    content: '\f054';
    font-family: "Font Awesome 5 Free";
    font-weight: 700;
    float: inline-end;
    font-size: 0.75rem;
    color: var(--text-color);
    margin-top: 5px;
}

#knowledge_block p {
    margin: 0;
    padding-left: 0.625rem;
    letter-spacing: 1px
}

#simple_calculate {
    background: #FFEECC;
    border-radius: 1rem;
    text-align: center;
    padding: 0 3rem 2.5rem;
}

#simple_calculate>h3 {
    /* color: var(--supplementary-grass-green); */
    font-size: 1.5rem;
    font-weight: 700;
    padding: 1rem 0;
    border-bottom: var(--secondary-color) 1px solid;
}

#simple_calculate>p {
    font-size: 1.25rem;
}

#simple_wood {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    align-items: center;
    justify-content: center;
}

#simple_wood li {
    width: fit-content;
    height: auto;
}

#simple_wood label {
    display: block;
    width: 150px;
    height: 180px;
    margin: 0 auto 0.625rem;
    padding: 0.75rem 0;
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
    cursor: pointer;
}

#simple_wood label:has(input[type="radio"]:checked) {
    background: var(--secondary-color);
}

#simple_wood .square_img {
    margin: 0 auto 0.625rem;
    width: 130px;
    height: 130px;
    background: var(--light-gray);
    position: relative;
    overflow: hidden;
}

img[src$="Wood/default.png"] {
    width: auto;
    height: 100%;
    position: relative;
    left: -25%;
    z-index: 1;
}

.square_img:has(img[src$="Wood/default.png"])::before {
    content: 'DEFAULT\AIMAGE';
    white-space: pre;
    position: absolute;
    bottom: 25%;
    left: 0;
    right: -2px;
    text-align: center;
    font-weight: 700;
    line-height: 150%;
    font-size: 1.5rem;
    letter-spacing: 0.25rem;
    color: white;
    z-index: 2;
}

.calculate_content .form_row {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.5rem;
}

.calculate_content .form_row.method_switch {
    justify-content: center;
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.calculate_content .form_row>div {
    min-width: 4rem;
    max-width: fit-content;
    padding: 0 0.625rem;
}

.calculate_content input,
.calculate_content select {
    border-radius: 0.5rem;
}

.calculate_content .calculate_method {
    padding: 1rem 3.375rem;
    border-radius: 0.5rem;
}

.calculate_content .calculate_distance {
    padding: 0 3.375rem;
}

.calculate_content .calculate_method .form_row:not(:last-child) {
    margin-bottom: 1rem;
}

.forward_btn {
    background: var(--supplementary-grass-green);
    color: white;
    margin: auto;
}

.forward_btn:disabled {
    filter: grayscale(1);
}

#simple_wood .custom_input {
    --border-color: var(--text-color);
    --background-color: var(--text-color);
}

@media (max-width: 768px) {
    #simple_wood label {
        height: fit-content;
        font-size: 1.25rem;
    }
}