/* 背景样式 */
body {
    position: relative;
    min-height: 100vh;
    margin: 0;
    background: url('../assets/images/background.png') no-repeat center center fixed;
    background-size: cover;
    color: var(--text-color);
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.65);
    z-index: -1;
}

/* 组件半透明效果 */
.top-nav {
    background: rgba(var(--surface-rgb), 0.95);
    backdrop-filter: blur(10px);
}

.content-card {
    background: rgba(var(--surface-rgb), 0.9);
    backdrop-filter: blur(10px);
}

/* 响应式背景调整 */
@media (max-width: 768px) {
    body {
        background-attachment: scroll;
    }
}