/* 优先加载压缩后的 WebP 背景图。 */
.slide-performance{background-image:url("images/hero-performance.webp")}.courses{background-image:linear-gradient(100deg,rgba(20,55,58,.9),rgba(39,96,99,.75)),url("images/hero-classroom.webp")}.geo-section{background-image:linear-gradient(102deg,rgba(40,31,31,.93),rgba(128,51,42,.82),rgba(221,84,57,.63)),url("images/hero-competition.webp")}@media(max-width:760px){.courses{background-image:linear-gradient(180deg,rgba(20,55,58,.91),rgba(39,96,99,.9)),url("images/hero-classroom.webp")}.geo-section{background-image:linear-gradient(180deg,rgba(40,31,31,.93),rgba(128,51,42,.91)),url("images/hero-competition.webp")}}