.breadcrumb{padding:1rem 0;margin-bottom:2rem}.breadcrumb ol{display:flex;list-style:none;margin:0;padding:0;gap:.5rem;align-items:center}.breadcrumb li:not(:last-child):after{content:">";margin-left:.5rem;color:#6c757d}.breadcrumb a{text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.breadcrumb [aria-current=page]{color:#6c757d;font-weight:500}.product-detail{padding:0 0 4rem}.product-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:start}.product-gallery{display:flex;flex-direction:column;gap:1rem}.main-image-container{position:relative;width:100%}.main-image-container img{width:100%;height:auto;display:block}.gallery-arrow{position:absolute;top:50%;transform:translateY(-50%);background:#808080cc;border:none;border-radius:50%;width:24px;height:24px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease;z-index:10;color:#fff}.gallery-arrow:hover{background:gray}.gallery-arrow-left{left:12px}.gallery-arrow-right{right:12px}.gallery-dots{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;max-width:300px;margin:12px auto}.gallery-dots.multi-row{max-width:400px;justify-content:center;align-items:center;gap:8px 12px}.gallery-dot{width:8px;height:8px;border-radius:50%;border:none;background:#ccc;cursor:pointer;transition:all .3s ease;flex-shrink:0}.gallery-dot:hover{background:#999}.gallery-dot.active{background:#333}.thumbnail-container{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem}.thumbnail-image{width:100%;height:auto;cursor:pointer;border:2px solid transparent;transition:border-color .3s ease}.thumbnail-image:hover{border-color:var(--color-gray)}.thumbnail-image.active{border-color:var(--color-dark-gray)}.product-info{position:sticky;top:5rem}.product-title{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;font-family:Effra CC Bold,Noto Sans JP,sans-serif}.product-title span{font-size:2.2rem}.product-subtitle{font-size:1.25rem;letter-spacing:.08em;margin-bottom:.25rem;text-transform:uppercase;font-weight:700}.product-description{margin-bottom:2rem;line-height:1.6;font-weight:700}.spec-card{padding-top:1rem;border-top:1px solid var(--color-dark-gray)}.spec-title{font-size:1.5rem;font-weight:700;margin-bottom:2rem;color:var(--color-dark-gray);padding-bottom:.5rem}.spec-item{margin-bottom:1rem;padding-bottom:1rem;border-bottom:1px solid var(--color-dark-gray);display:flex;align-items:flex-start;gap:2rem}.spec-label{font-size:1rem;color:var(--color-dark-gray);min-width:100px;flex-shrink:0;line-height:1.6}.spec-value{color:#666;line-height:1.6;flex:1}.material-spec .spec-value{display:flex;flex-direction:column;gap:.5rem}.material-row{display:flex;align-items:flex-start;gap:1rem}.material-label{min-width:120px;flex-shrink:0;color:#666;font-size:.9rem}.material-content{color:#666;flex:1}.color-options{display:flex;align-items:flex-start;gap:.5rem;flex-wrap:nowrap;overflow-x:auto;height:auto}.color-image{height:30px;width:auto;object-fit:contain;display:block;flex:0 0 auto}.color-lineup-image{height:30px;width:auto;display:block}.price{font-weight:700;margin:0;color:#666}.material-spec{padding-top:1rem;padding-bottom:2rem}.product-extra-section{padding:4rem 0;background:#fff}.section-title{font-size:2rem;font-weight:700;text-align:center;margin-bottom:3rem;color:var(--color-dark-gray)}.sketch-image-container{text-align:center;margin-bottom:4rem}.sketch-image-container img{max-width:100%;height:auto;border-radius:8px}.video-section{padding:0}.video-grid{display:block}.video-item{position:relative;width:100%;margin-bottom:2rem;overflow:hidden}.video-item{position:relative;width:100%;min-height:200px}.video-iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.related-products-section{padding:4rem 0;background:#fff}.related-products-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:2rem}.related-product-card{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 4px 12px #0000001a;transition:transform .3s ease}.related-product-card:hover{transform:translateY(-4px)}.related-product-card img{width:100%;height:200px;object-fit:cover}.related-product-card h3{font-size:1.1rem;font-weight:600;margin:1rem;color:var(--color-dark-gray)}.related-product-card p{color:#666;margin:0 1rem 1rem;font-size:.9rem}.related-product-card .btn{display:block;margin:1rem;padding:.75rem 1.5rem;background:var(--color-brand-green);color:#fff;text-decoration:none;border-radius:6px;text-align:center;transition:background .3s ease}.related-product-card .btn:hover{background:#5a6b5a}.error-page{padding:4rem 0;text-align:center}.error-page h1{font-size:2rem;color:var(--color-dark-gray);margin-bottom:1rem}.error-page p{color:#666;margin-bottom:2rem}@media (max-width: 1024px){.product-grid{grid-template-columns:1fr;gap:2rem}.product-info{position:static}}@media (max-width: 768px){.product-title{font-size:2rem}.video-grid{grid-template-columns:1fr}.video-item{max-width:100%;margin-bottom:1.5rem}.related-products-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.gallery-arrow{width:28px;height:28px}.gallery-arrow-left{left:8px}.gallery-arrow-right{right:8px}.gallery-dots{gap:10px;max-width:280px}.gallery-dots.multi-row{max-width:360px;gap:6px 10px}.gallery-dot{width:6px;height:6px;min-width:6px;min-height:6px}}@media (max-width: 480px){.product-subtitle{font-size:1.1rem}.product-title{font-size:1.6rem}.product-title span{font-size:1.4rem}.section-title{font-size:1.5rem}.spec-item{flex-direction:column;gap:.5rem}.spec-label{min-width:auto}.material-label{min-width:80px}.video-item{margin-bottom:1rem}.gallery-dots{gap:8px;max-width:260px}.gallery-dots.multi-row{max-width:330px;gap:4px 8px}.gallery-dot{width:6px;height:6px;min-width:6px;min-height:6px}}.container{max-width:1200px;margin:0 auto;padding:0 1rem}.key-visual-section{position:relative;width:100%;margin-bottom:2rem}.key-visual-image{width:100%;height:auto;display:block}.product-long-description{color:#444;line-height:1.8;font-size:.95rem;margin-bottom:4rem}.spec-title,.section-title{font-family:Effra CC XBold,Noto Sans JP,sans-serif;font-weight:800}