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/************************************导航条*********************************8***********************/.nav{margin-top:167px ;}#shiping{width:800px;margin: 0 auto;}*, *:before, *:after {box-sizing: border-box;}.content {display: flex;margin: 0 auto;justify-content: center;align-items: center;flex-wrap: wrap;max-width: 1000px;}.heading {width: 100%;margin-left: 1rem;font-weight: 900;font-size: 1.618rem;text-transform: uppercase;letter-spacing: .1ch;line-height: 1;padding-bottom: .5em;margin-bottom: 1rem;position: relative;}.heading:after {display: block;content: '';position: absolute;width: 60px;height: 4px;background: linear-gradient(135deg, #1a9be6, #1a57e6);bottom: 0;}.description {width: 100%;margin-top: 0;margin-left: 1rem;margin-bottom: 3rem;}.card {color: inherit;cursor: pointer;width: calc(33% - 2rem);min-width: calc(33% - 2rem);height: 400px;min-height: 400px;perspective: 1000px;margin: 1rem;position: relative;}@media screen and (max-width: 800px) {.card {width: calc(50% - 2rem);}}@media screen and (max-width: 500px) {.card {width: 100%;}}.front,.back {display: flex;border-radius: 6px;background-position: center;background-size: cover;text-align: center;justify-content: center;align-items: center;position: absolute;height: 100%;width: 100%;-webkit-backface-visibility: hidden;backface-visibility: hidden;transform-style: preserve-3d;transition: ease-in-out 600ms;}.front {background-size: cover;padding: 2rem;font-size: 1.618rem;font-weight: 600;color: #fff;overflow: hidden;font-family: Poppins, sans-serif;}.front:before {position: absolute;display: block;content: '';top: 0;left: 0;right: 0;bottom: 0;background: linear-gradient(135deg, #1a9be6, #1a57e6);opacity: .25;z-index: -1;}.card:hover .front {transform: rotateY(180deg);}.card:nth-child(even):hover .front {transform: rotateY(-180deg);}.back {background: #fff;transform: rotateY(-180deg);padding: 0 2em;}.card:hover .back {transform: rotateY(0deg);}.card:nth-child(even) .back {transform: rotateY(180deg);}.card:nth-child(even):hover .back {">