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(width>=600px){.album-grid{grid-template-columns:repeat(3,1fr)}.photo-grid{grid-template-columns:repeat(4,1fr)}}@media (width>=900px){.album-grid{grid-template-columns:repeat(4,1fr);gap:16px}.photo-grid{grid-template-columns:repeat(5,1fr)}}@media (width<=600px){.lightbox-nav{padding:10px;font-size:36px}.gallery-header h1{font-size:18px}}