.background-gallery{max-width:1360px;margin:auto;padding:44px 28px 64px}.background-gallery h1{font-size:clamp(30px,4vw,48px);margin:12px 0 20px}.background-intro{max-width:900px;font-size:14px;line-height:1.9;color:#587587}.background-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:32px}.background-card{padding:20px;background:#fff;border:1px solid #dce8ed;border-radius:18px;scroll-margin-top:20px}.background-card h2{font-size:17px;margin:0 0 18px}.background-pair{display:grid;grid-template-columns:1fr 1fr;gap:14px}.background-pair figure{margin:0;min-width:0}.background-pair img{display:block;width:100%;height:auto;aspect-ratio:390/844;object-fit:cover;border:1px solid #e2edf2;border-radius:8px}.background-pair figcaption{font-size:11px;color:#688394;margin-top:9px;line-height:1.6}.background-links{display:flex;justify-content:space-between;gap:12px;margin-top:18px;flex-wrap:wrap;font-size:12px;color:#156bad}.background-links a{padding:8px 0}.background-extra{margin-top:32px;padding:24px;background:#fff;border-radius:18px;max-width:650px}.background-extra h2{font-size:19px}.background-extra img{width:100%;height:auto;border-radius:12px}.background-extra a{font-size:13px;color:#156bad}@media(max-width:1000px){.background-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:600px){.background-gallery{padding:30px 16px}.background-grid{grid-template-columns:1fr;gap:18px}.background-card{padding:18px}.background-gallery h1{font-size:30px}.background-pair{gap:12px}.site-head{font-size:12px;line-height:1.6}}