.accordion-section {
    background: #fffaf7;
    padding: 4rem 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.accordion-section h2 {
    font-size: 22px;
    letter-spacing: 0.08em;
    margin-bottom: 1.5rem;
}

.accordion-item {
    border-bottom: 1px dashed #ccc;
}

.accordion-title {
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: #2e2a26;
    padding: 1.2rem 0;
    position: relative;
    cursor: pointer;
    transition: color 0.3s;
}

.accordion-title::after {
    content: "▼";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    transition: transform 0.3s ease;
}

.accordion-title.active::after {
    transform: translateY(-50%) rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    color: #4d403a;
    line-height: 1.8;
    font-family: "Noto Sans JP", system-ui, sans-serif;
}

.accordion-content p {
    padding-bottom: 1.2rem;
}

.accordion-content.open {
    max-height: 300px;
}

@media (max-width: 768px) {
    .accordion-section {
        padding: 3rem 1rem;
    }
    .accordion-title {
        font-size: 1rem;
    }
}

.site-footer {
    background: #5a5552;
    color: #fff;
    text-align: center;
    padding: 4rem 1.5rem;
    font-family: "Noto Sans JP", sans-serif;
}

.footer-inner {
    max-width: 1000px;
    margin: 0 auto;
}

.footer-logo {
    font-size: 1.8rem;
    letter-spacing: 0.2em;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #fff;
}

.footer-desc {
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.footer-info p {
    font-size: 0.85rem;
    line-height: 1.8;
    opacity: 0.8;
}

.footer-links {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
    text-align: left;
    margin: 3rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding: 2rem 0;
}

.footer-column h3 {
    font-size: 0.9rem;
    letter-spacing: 0.1em;
    opacity: 0.7;
    margin-bottom: 1rem;
    color: #fff;
}

.footer-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-column ul li {
    margin-bottom: 0.4rem;
}

.footer-column ul li a {
    color: #fff;
    opacity: 0.8;
    text-decoration: none;
    font-size: 0.9rem;
    transition: opacity 0.3s;
}

.footer-column ul li a:hover {
    opacity: 1;
}

.footer-sns {
    margin-top: 2rem;
}

.footer-sns a {
    color: #fff;
    opacity: 0.8;
    font-size: 1.6rem;
    margin: 0 0.5rem;
    transition: opacity 0.3s;
}

.footer-sns a:hover {
    opacity: 1;
}

.footer-copy {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 1.5rem;
    letter-spacing: 0.05em;
}

@media (max-width: 768px) {
    .footer-links {
        flex-direction: column;
        text-align: center;
    }
}

.back-to-top {
    position: fixed;
    right: 1.5rem;
    bottom: 2rem;
    background: rgb(255 255 255 / 73%);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    pointer-events: none;
    backdrop-filter: blur(6px);
    z-index: 999;
    color: #323232;
}

.back-to-top.show {
    opacity: 1;
    pointer-events: auto;
}

.back-to-top:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}