/* ========== 双层壁纸系统 ========== */
.wallpaper-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: var(--wallpaper-fit, cover);
    background-position: var(--wallpaper-position, center);
    background-repeat: no-repeat;
    background-color: var(--fallback-end);
    background-image: linear-gradient(180deg, var(--fallback-start) 0%, var(--fallback-mid) 50%, var(--fallback-end) 100%);
    z-index: 0;
    contain: layout style paint;
    will-change: transform;
    transform: translateZ(0);
}

.wallpaper-layer-front {
    z-index: 1;
    opacity: 0;
    background-color: transparent;
    background-image: none;
    transition: opacity 0.5s ease;
    pointer-events: none;
    contain: layout style paint;
    will-change: opacity;
}

.wallpaper-layer-front.active {
    opacity: 1;
}

.wallpaper-video-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: var(--wallpaper-fit, cover);
    object-position: var(--wallpaper-position, center);
    background: #000;
    opacity: 0;
    pointer-events: none;
    contain: layout style paint;
    transform: translateZ(0);
}

.wallpaper-video-single {
    z-index: 0;
    transition: opacity 0.5s ease;
}

.wallpaper-video-layer.active {
    opacity: 1;
}

.wallpaper-blur-active .wallpaper-layer {
    will-change: transform;
}

/* ========== RSS 壁纸摘要 ========== */
.rss-wallpaper-info {
    position: fixed;
    left: 24px;
    right: 24px;
    z-index: 40;
    color: #fff;
    pointer-events: none;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
}

.rss-wallpaper-info.top {
    top: 28px;
}

.rss-wallpaper-info.top.expanded {
    right: 132px;
    max-width: min(720px, calc(100vw - 156px));
}

.rss-wallpaper-info.bottom {
    bottom: 28px;
}

.rss-wallpaper-info.expanded {
    max-width: min(720px, calc(100vw - 48px));
    margin-left: auto;
    padding: 12px 14px;
    border-radius: 8px;
    background: rgba(10, 15, 24, 0.52);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.rss-info-title {
    font-size: calc(13px * var(--app-font-scale, 1));
    font-weight: 700;
    line-height: 1.3;
}

.rss-info-desc {
    margin-top: 4px;
    font-size: calc(12px * var(--app-font-scale, 1));
    line-height: 1.45;
    color: rgba(255, 255, 255, 0.78);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.rss-wallpaper-info a {
    display: inline-flex;
    margin-top: 8px;
    color: rgba(255, 255, 255, 0.9);
    font-size: calc(12px * var(--app-font-scale, 1));
    pointer-events: auto;
}

.rss-wallpaper-info.icon {
    left: auto;
    right: 24px;
}

.rss-wallpaper-info.top.icon {
    right: 132px;
}

.rss-info-toggle {
    width: 36px;
    height: 36px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(10, 15, 24, 0.52);
    color: #fff;
    font-weight: 700;
    pointer-events: auto;
    cursor: pointer;
}

.rss-info-popover {
    position: absolute;
    right: 0;
    bottom: 44px;
    width: min(320px, calc(100vw - 48px));
    padding: 12px 14px;
    border-radius: 8px;
    background: rgba(10, 15, 24, 0.66);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(4px);
    transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s ease;
    pointer-events: auto;
}

.rss-wallpaper-info.top .rss-info-popover {
    top: 44px;
    bottom: auto;
}

.rss-wallpaper-info.icon:hover .rss-info-popover,
.rss-wallpaper-info.icon:focus-within .rss-info-popover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.wallpaper-download-notice {
    position: fixed;
    right: 24px;
    bottom: 80px;
    z-index: 45;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    max-width: min(300px, calc(100vw - 48px));
    min-height: 38px;
    padding: 9px 13px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 8px;
    background: rgba(10, 15, 24, 0.66);
    color: rgba(255, 255, 255, 0.92);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.24);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    pointer-events: none;
}

.wallpaper-download-notice[hidden] {
    display: none;
}

.wallpaper-download-spinner {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.26);
    border-top-color: rgba(255, 255, 255, 0.88);
    animation: wallpaper-download-spin 0.85s linear infinite;
    flex-shrink: 0;
}

.wallpaper-download-copy {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: calc(12px * var(--app-font-scale, 1));
    font-weight: 650;
    line-height: 1.35;
}

.wallpaper-download-notice.done .wallpaper-download-spinner,
.wallpaper-download-notice.error .wallpaper-download-spinner {
    animation: none;
    border-color: transparent;
    background: rgba(34, 197, 94, 0.88);
}

.wallpaper-download-notice.error .wallpaper-download-spinner {
    background: rgba(239, 68, 68, 0.88);
}

@keyframes wallpaper-download-spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 640px) {
    .rss-wallpaper-info {
        left: 16px;
        right: 16px;
    }

    .rss-wallpaper-info.expanded {
        max-width: calc(100vw - 32px);
    }

    .rss-wallpaper-info.top.expanded {
        top: 66px;
        right: 16px;
        max-width: calc(100vw - 32px);
    }

    .rss-wallpaper-info.icon {
        left: auto;
        right: 16px;
    }

    .rss-wallpaper-info.top.icon {
        top: 66px;
        right: 16px;
    }

    .rss-info-popover {
        width: min(320px, calc(100vw - 32px));
    }

    .wallpaper-download-notice {
        right: 16px;
        bottom: 78px;
        max-width: min(300px, calc(100vw - 32px));
    }
}