html {
    scroll-behavior: smooth;
}

main {
    background-color: #1c1b17;
    color: #fdfdfd;
    padding-top: 100px;
    padding-bottom: 250px;
    text-align: center;
}

main .menu {
    display: flex;
    background-color: #2a2822;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 50px;
    justify-content: center;
    border-radius: 10px;
    flex-wrap: wrap;
}

main .menu li {
    background-color: #38362e;
    color: #d9cc8b;
    padding: 10px 25px;
    margin: 10px 5px;
    border-radius: 5px;
}

main .menu li:hover {
    color: #e0d6b8;
    text-decoration: underline;
}

main .top {
    position: fixed;
    color: #d9cc8b;
    bottom: 75px;
    right: 70px;
}

main .top:hover {
    color: #e0d6b8;
    text-decoration: underline;
}

main .language button {
    position: fixed;
    color: #d9cc8b;
    bottom: 75px;
}

main .language button:hover {
    color: #e0d6b8;
    text-decoration: underline;
}

main .language .en {
    left: 60px;
}

main .language .ja {
    left: 120px;
}

article {
    background-color: #2a2822;
    width: 1080px;
    padding: 12px 0;
    margin: 0 auto;
    border-radius: 10px;
    text-align: left;
}

article h1 {
    font-size: 36px;
    font-weight: bold;
    padding: 0 10px;
}

section {
    background-color: #38362e;
    width: 1060px;
    padding: 28px 0;
    margin: 30px auto;
    border-radius: 5px;
    scroll-margin-top: 150px;
}

.hero-section,
.feature-section,
.download-section,
.steps-section,
.faq-section {
    padding-left: 28px;
    padding-right: 28px;
}

.lead {
    font-size: 18px;
    line-height: 34px;
    color: #f3ebc7;
    padding: 16px 10px 0;
}

.summary-grid,
.feature-grid {
    display: grid;
    gap: 20px;
    padding: 28px 10px 0;
}

.summary-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.summary-card,
.feature-card {
    background-color: #2d2a24;
    border: 1px solid #4b4638;
    border-radius: 8px;
    padding: 24px;
}

.summary-card h2,
.feature-card h2,
.faq-section h2 {
    font-size: 24px;
    color: #f4e3a0;
    padding-bottom: 12px;
}

.summary-card p,
.feature-card p,
.download-section p,
.steps-section li,
.faq-section p {
    font-size: 15px;
    line-height: 28px;
    color: #f2efe5;
}

.feature-card img {
    display: block;
    width: 100%;
    margin-top: 18px;
    border-radius: 6px;
    border: 1px solid #555042;
}

.download-section {
    text-align: center;
}

.download-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: #ac8f39;
    color: #fdfdfd;
    font-size: 18px;
    font-weight: bold;
    padding: 16px 28px;
    margin-top: 24px;
    border-radius: 8px;
    transition: background-color 300ms, transform 200ms;
}

.download-button:hover {
    background-color: #debc54;
    transform: translateY(-2px);
}

.download-section .note {
    font-size: 13px;
    line-height: 24px;
    color: #d9cc8b;
    max-width: 720px;
    margin: 18px auto 0;
}

.steps-section ol {
    list-style-type: decimal;
    padding: 20px 30px 0 50px;
}

.steps-section li {
    padding: 10px 0;
}

.faq-section ul {
    padding: 20px 10px 0;
}

.faq-section li {
    padding: 18px 0;
    border-top: 1px solid #4b4638;
}

.faq-section li:first-child {
    border-top: none;
}

@media (max-width: 1232px) {
    main {
        padding-top: 30px;
    }

    main .language a,
    main .language button {
        position: unset;
        padding: 10px;
    }

    main .menu {
        margin: 30px auto;
        padding: 6px 8px;
    }

    main .menu.menu-en,
    main .menu.menu-ja {
        width: 380px;
    }

    main .menu li {
        font-size: 14px;
        padding: 10px 15px;
        margin: 6px 5px;
    }

    article {
        width: 760px;
        padding: 10px 0;
    }

    article h1 {
        font-size: 30px;
        padding: 0 5px;
    }

    section {
        width: 740px;
        scroll-margin-top: 100px;
    }

    .summary-grid,
    .feature-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 767px) {
    main .menu.menu-en,
    main .menu.menu-ja {
        width: 340px;
    }

    article {
        width: 370px;
    }

    article h1 {
        font-size: 26px;
    }

    section {
        width: 360px;
        margin: 20px auto;
    }

    .hero-section,
    .feature-section,
    .download-section,
    .steps-section,
    .faq-section {
        padding-left: 14px;
        padding-right: 14px;
    }

    .lead {
        font-size: 15px;
        line-height: 28px;
        padding-left: 0;
        padding-right: 0;
    }

    .summary-grid,
    .feature-grid,
    .faq-section ul {
        padding-left: 0;
        padding-right: 0;
    }

    .summary-card,
    .feature-card {
        padding: 18px;
    }

    .summary-card h2,
    .feature-card h2,
    .faq-section h2 {
        font-size: 18px;
    }

    .summary-card p,
    .feature-card p,
    .download-section p,
    .steps-section li,
    .faq-section p {
        font-size: 13px;
        line-height: 24px;
    }

    .download-button {
        font-size: 16px;
        width: 100%;
        justify-content: center;
    }

    .steps-section ol {
        padding: 16px 0 0 24px;
    }
}