.product-breadcrumb { max-width: 1600px; margin: 0 auto; padding: 28px clamp(22px, 5vw, 80px); font-size: .875rem; line-height: 1.6; }
.product h1 { margin: 0; font-size: clamp(2.1rem, 4vw, 4.6rem); line-height: 1.14; letter-spacing: -.045em; overflow-wrap: anywhere; }
.product-guide, .product-faq, .related-app { max-width: 1000px; margin: 0 auto; padding: 50px clamp(22px, 5vw, 70px); }
.product-guide h2, .product-faq h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); line-height: 1.3; margin: 0 0 24px; }
.product-guide p, .product-faq p { font-size: 1.0625rem; line-height: 1.8; }
.product-faq { border-top: 1px solid #ccc; }
.product-faq details { padding: 22px 0; border-bottom: 1px solid #ccc; }
.product-faq summary { font-size: 1.125rem; font-weight: 700; line-height: 1.6; cursor: pointer; }
.product-faq p { max-width: 760px; margin: 18px 0 0; }
.related-app { display: flex; flex-wrap: wrap; gap: 24px; font-weight: 700; }

.product .cat-brand h1 {font-size:clamp(1.4rem,2.4vw,2.3rem);line-height:1.3;letter-spacing:-.04em;}