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(max-width:768px){.free-bgm-archive-header{padding:35px 20px;border-radius:8px;margin-bottom:30px}.archive-title{font-size:1.75rem}.archive-description{font-size:1rem}.free-bgm-card-grid{grid-template-columns:1fr;gap:20px}.play-icon{width:50px;height:50px}.card-content{padding:16px}.card-title{font-size:1rem}}@media screen and (min-width:768px) and (max-width:1024px){.free-bgm-card-grid{grid-template-columns:repeat(2,1fr)}}@media screen and (min-width:1280px){.free-bgm-card-grid{grid-template-columns:repeat(4,1fr)}}.free-bgm-card-grid{padding:0 15px}@media screen and (min-width:480px){.free-bgm-card-grid{grid-template-columns:repeat(auto-fill,minmax(280px, 1fr));padding:0}}@media screen and (min-width:768px){.free-bgm-grid-container{padding:0 20px}.filter-container{padding:0 20px}}@media screen and (min-width:1024px){.free-bgm-card-grid{grid-template-columns:repeat(3,1fr);gap:30px}}@media (hover:none) and (pointer:coarse){.filter-btn,.card-link,.sound-nav li a,.btn-primary,.btn-secondary{min-height:44px;min-width:44px;display:flex;align-items:center;justify-content:center}.free-bgm-card:hover{transform:none}.filter-btn:hover,.btn-primary:hover,.btn-secondary:hover{transform:none}.free-bgm-card,.filter-btn,.btn-primary,.btn-secondary{-webkit-tap-highlight-color:rgba(102,126,234,.2)}.free-bgm-card-grid{-webkit-overflow-scrolling:touch}}@media screen and (max-width:768px){.free-bgm-grid-container{overflow-x:auto;-webkit-overflow-scrolling:touch}.free-bgm-card{scroll-snap-align:start}}.filter-btn:focus,.card-link:focus,.free-bgm-card-link:focus,.bgm-search-input:focus,button:focus,a:focus{outline:3px solid var(--bgm-primary,#667eea);outline-offset:2px}.filter-btn:focus{background-color:var(--bgm-action,#ff8c00);color:#fff}.skip-to-content{position:absolute;top:-40px;left:0;background:var(--bgm-primary,#667eea);color:#fff;padding:8px 16px;text-decoration:none;z-index:100;border-radius:0 0 4px}.skip-to-content:focus{top:0}.free-bgm-card:focus-within{outline:2px solid var(--bgm-primary,#667eea);outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}.sr-only-focusable:active,.sr-only-focusable:focus{position:static;width:auto;height:auto;overflow:visible;clip:auto;white-space:normal}.filter-loading-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(255,255,255,.9);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:10;min-height:400px}.loading-spinner{width:48px;height:48px;border:4px solid rgba(102,126,234,.2);border-top-color:var(--bgm-primary,#667eea);border-radius:50%;animation:spinner-rotation .8s linear infinite}@keyframes spinner-rotation{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}.loading-text{margin-top:16px;color:var(--bgm-text-secondary,#64748b);font-size:14px;font-weight:500}.filter-error-message{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;min-height:400px;text-align:center}.error-icon{width:64px;height:64px;color:#ef4444;margin-bottom:16px}.error-message-text{color:var(--bgm-text-primary,#1e293b);font-size:16px;font-weight:500;margin-bottom:24px;max-width:400px}.retry-btn{background:var(--bgm-primary,#667eea);color:#fff;border:none;padding:12px 24px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all .3s ease}.retry-btn:hover{background:var(--bgm-primary-dark,#5568d3);transform:translateY(-2px);box-shadow:0 4px 12px rgba(102,126,234,.3)}.retry-btn:active{transform:translateY(0)}.no-posts-message{display:flex;align-items:center;justify-content:center;padding:64px 24px;min-height:400px;text-align:center}.no-posts-message p{color:var(--bgm-text-secondary,#64748b);font-size:16px;font-weight:500}.free-bgm-grid-container{position:relative;min-height:400px}@media screen and (max-width:768px){.filter-loading-overlay{min-height:300px}.loading-spinner{width:40px;height:40px;border-width:3px}.loading-text{font-size:13px}.filter-error-message{padding:32px 16px;min-height:300px}.error-icon{width:48px;height:48px}.error-message-text{font-size:14px;margin-bottom:20px}.retry-btn{padding:10px 20px;font-size:13px}.no-posts-message{padding:48px 16px;min-height:300px}.no-posts-message p{font-size:14px}}