/* 设置中文字体，优先使用系统默认的高质量字体 */
body { 
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; 
}

/* 全局平滑滚动 */
html {
    scroll-behavior: smooth;
    /* 解决点击导航栏跳转时，内容被 fixed header 遮挡的问题 */
    scroll-padding-top: 80px; 
}

/* 首页 Hero 背景图设置 */
.hero-bg {
    /* 替换为您喜欢的高清图片链接 */
    background-image: url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?ixlib=rb-1.2.1&auto=format&fit=crop&w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed; /* 视差滚动效果 */
}

/* 简单的淡入向上动画 (Fade In Up) */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translate3d(0, 40px, 0);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
    }
}

.animate-fade-in-up {
    animation-name: fadeInUp;
    animation-duration: 0.8s;
    animation-fill-mode: both;
}

/* 延迟类 */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }

/* 导航栏滚动时的阴影效果 */
.nav-scrolled {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    background-color: rgba(255, 255, 255, 0.98) !important;
}