/* 平台公告横幅：固定在聊天记录顶部，不参与消息滚动 */
.support-announcement {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    flex: 0 0 auto;
    padding: 9px 10px 9px 12px;
    margin: 0;
    background: color-mix(in srgb, var(--support-color, #635bff) 8%, #fff);
    border-bottom: 1px solid color-mix(in srgb, var(--support-color, #635bff) 18%, #fff);
    font-size: 12.5px;
    line-height: 1.55;
    color: #2b3145;
}

.support-announcement.is-warning {
    background: #fff6e8;
    border-bottom-color: #f2d09a;
    color: #7a4a08;
}

.support-announcement-main {
    display: block;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    font: inherit;
    text-align: left;
    cursor: pointer;
    min-width: 0;
    flex: 1 1 auto;
}

.support-announcement-main strong {
    display: block;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    font-size: 13px;
    font-weight: 600;
}

.support-announcement-main span {
    /* 正文可能较长，限高三行，避免公告把聊天区挤没 */
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
}

.support-window .support-announcement { height: 62px; max-height: 62px; box-sizing: border-box; align-self: start; }
.support-window.has-announcement .support-announcement-main span { -webkit-line-clamp: 1; }
.support-announcement-details { padding: 0; border: 0; background: transparent; color: inherit; font: inherit; cursor: pointer; flex: 0 0 auto; align-self: center; text-decoration: underline; }
.support-announcement-dialog { box-sizing: border-box; width: min(480px, calc(100% - 24px)); max-height: min(640px, 80dvh); padding: 20px; border: 1px solid #d9dee7; border-radius: 8px; color: #252a36; background: #fff; overflow: auto; }
.support-announcement-dialog::backdrop { background: rgba(0, 0, 0, .35); }
.support-announcement-dialog h2 { margin: 0 0 16px; font-size: 18px; line-height: 1.5; overflow-wrap: anywhere; }
.support-announcement-dialog p { white-space: pre-wrap; overflow-wrap: anywhere; font-size: 14px; line-height: 1.7; }
.support-announcement-dialog a { display: block; margin: 16px 0; color: #315dba; overflow-wrap: anywhere; }
.support-announcement-dialog > button { padding: 8px 16px; border: 1px solid #ccd3df; border-radius: 6px; background: #fff; color: #252a36; cursor: pointer; }

.support-announcement-main a {
    color: var(--support-color, #635bff);
    text-decoration: underline;
    white-space: nowrap;
}

.support-announcement.is-warning .support-announcement-main a {
    color: #a35a06;
}

.support-announcement-close {
    flex: 0 0 auto;
    width: 20px;
    height: 20px;
    padding: 0;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: inherit;
    opacity: .55;
    font-size: 16px;
    line-height: 18px;
    cursor: pointer;
}

.support-announcement-close:hover,
.support-announcement-close:focus-visible {
    opacity: 1;
    background: rgba(0, 0, 0, .06);
}

@media (max-width: 520px) {
    .support-announcement {
        padding: 8px 8px 8px 10px;
        font-size: 12px;
    }
    .support-announcement-main strong {
        font-size: 12.5px;
    }
}