/* ==========================================================================
   Maoge Site Backdrop - Ultra-smooth 60fps Illustrated Background
   100% Replicated from MCXiaochen / Chen Yuanchen Blog
   ========================================================================== */

.maoge-backdrop {
    position: fixed;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
    will-change: transform;
    transform: translateZ(0);
    background-color: var(--body-bg-color, #f4f7f6);
}

/* Dark mode base fallback */
.dark-theme .maoge-backdrop,
[data-theme="dark"] .maoge-backdrop,
body.dark-theme .maoge-backdrop {
    background-color: #0f141c;
}

/* High-fidelity background image layer */
.maoge-backdrop__image {
    position: absolute;
    inset: 0;
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    opacity: 0;
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity;
    transform: translateZ(0);
}

.maoge-backdrop__image--loaded {
    opacity: 1;
}

/* Semi-transparent adaptive readability overlay */
.maoge-backdrop__overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    /* Day mode: soft translucent frost gradient */
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.58) 0%, rgba(255, 255, 255, 0.78) 100%);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    transition: background 0.3s ease;
}

/* Night / Dark theme overlay */
.dark-theme .maoge-backdrop__overlay,
[data-theme="dark"] .maoge-backdrop__overlay,
body.dark-theme .maoge-backdrop__overlay {
    background: linear-gradient(135deg, rgba(15, 20, 28, 0.65) 0%, rgba(10, 14, 20, 0.85) 100%);
}

/* Mobile & Performance optimization: Disable heavy image background on narrow screens if preferred */
@media (max-width: 768px) {
    .maoge-backdrop.maoge-backdrop--mobile-hide .maoge-backdrop__image {
        display: none !important;
    }
}