*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px}body,html{width:100%;height:100%;margin:0;padding:0;overflow-y:auto;overflow-x:hidden;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background-color:#0d0c12}.container{width:100%;min-height:100vh;position:relative;display:flex;justify-content:center;align-items:flex-start}.image-stack{width:100%;display:flex;flex-direction:column;position:relative}.bg-image{width:100%;height:auto;display:block}.middle-image-container{position:relative;width:100%;display:flex;justify-content:center;align-items:center}.fourth-image-container{position:relative;width:100%;display:flex;justify-content:center;align-items:center}.download-btn{position:absolute;top:50%;left:50%;transform:translate(-50%, -50%);background:none;border:none;cursor:pointer;padding:0;outline:none;-webkit-tap-highlight-color:rgba(0,0,0,0);z-index:10}.download-btn 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drop-shadow(0 0 24px rgba(59, 130, 246, 0.07)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.035))}10%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.245)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.175)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.105)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.0525))}20%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.28)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.21)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.14)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.07))}30%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.315)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.245)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.175)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.0875))}40%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.35)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.28)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.21)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.105))}50%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.385)) drop-shadow(0 0 16px rgba(59, 130, 246, 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246, 0.14)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.07)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.035))}}@keyframes breathing-light{0%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.3)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.2)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.1)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.05))}10%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.35)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.25)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.15)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.075))}20%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.4)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.3)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.2)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.1))}30%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.45)) drop-shadow(0 0 16px rgba(59, 130, 246, 0.35)) drop-shadow(0 0 24px rgba(59, 130, 246, 0.25)) drop-shadow(0 0 32px rgba(59, 130, 246, 0.125))}40%{filter:drop-shadow(0 0 8px rgba(59, 130, 246, 0.5)) drop-shadow(0 0 16px 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