/* ===== 站点公告栏 ===== */
.site-announcement {
    position: relative;
    z-index: 900;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    width: 100%;
    max-width: 1180px;
    margin: 12px auto 0;
    padding: 14px 18px;
    box-sizing: border-box;
    border: 1px solid color-mix(in srgb, var(--s-color-outline-variant) 55%, transparent);
    border-radius: 20px;
    background: color-mix(in srgb, var(--s-color-surface-container) 82%, transparent);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    color: var(--s-color-on-surface);
    font-size: 0.9rem;
    line-height: 1.6;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.2, 0, 0, 1);
}

.site-announcement.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.site-announcement__icon {
    flex-shrink: 0;
    margin-top: 2px;
    font-size: 1.25rem;
    color: var(--s-color-primary);
}

.site-announcement__content {
    flex: 1;
    min-width: 0;
    overflow-wrap: anywhere;
}

.site-announcement__link {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    margin-left: 6px;
    color: var(--s-color-primary);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 1px dashed color-mix(in srgb, var(--s-color-primary) 60%, transparent);
}

.site-announcement__link:hover {
    opacity: 0.8;
}

.site-announcement__close {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--s-color-on-surface-variant);
    cursor: pointer;
    transition: background-color 0.25s ease, transform 0.25s ease;
}

.site-announcement__close:hover {
    background: var(--s-color-surface-container-high);
    transform: rotate(90deg);
}

.site-announcement__close material-icon {
    font-size: 1.1rem;
}

/* 类型变体 */
.site-announcement--warning {
    background: color-mix(in srgb, var(--s-color-tertiary-container) 72%, transparent);
    border-color: color-mix(in srgb, var(--s-color-tertiary) 40%, transparent);
    color: var(--s-color-on-tertiary-container);
}

.site-announcement--warning .site-announcement__icon,
.site-announcement--warning .site-announcement__link {
    color: var(--s-color-on-tertiary-container);
}

.site-announcement--success {
    background: color-mix(in srgb, var(--s-color-primary-container) 72%, transparent);
    border-color: color-mix(in srgb, var(--s-color-primary) 40%, transparent);
    color: var(--s-color-on-primary-container);
}

.site-announcement--success .site-announcement__icon,
.site-announcement--success .site-announcement__link {
    color: var(--s-color-on-primary-container);
}

/* 桌面端侧边栏常显时同步缩进 */
@media screen and (min-width: 840px) {
    .site-announcement {
        max-width: calc(1180px - 312px);
        margin-left: 332px;
        transition: margin-left 0.25s var(--s-motion-easing-standard);
    }

    body:not(.sidebar-is-open) .site-announcement {
        max-width: 1180px;
        margin-left: auto;
    }
}

@media (max-width: 840px) {
    .site-announcement {
        margin: 10px 16px 0;
        width: auto;
        font-size: 0.85rem;
        padding: 12px 14px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-announcement {
        transition: none !important;
    }
}