/* 前台整体公告：按级别区分视觉，文字与背景对比度均 >= 4.5:1 */
.ybb-ann {
    --ybb-ann-page-bg: #f2f4f7;
    --ybb-ann-page-text: #1b1f27;
    --ybb-ann-page-border: #ccd3de;
    background: var(--ybb-ann-page-bg);
    color: var(--ybb-ann-page-text);
    border-bottom: 1px solid var(--ybb-ann-page-border);
    padding: 10px 16px;
    position: relative;
    z-index: 1;
    font-size: 14px;
    line-height: 1.7;
}
.ybb-ann[hidden] { display: none !important; }
.ybb-ann-shell {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
}
.ybb-ann-card {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 10px 14px;
    padding: 10px 14px;
    border-radius: 8px;
    background: #0b4a9e;
    color: #ffffff;
}
.ybb-ann-card.is-important { background: #f2c94c; color: #1b1f27; }
.ybb-ann-card.is-urgent { background: #b42318; color: #ffffff; }
.ybb-ann-level {
    flex: 0 0 auto;
    display: inline-block;
    padding: 1px 8px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 700;
    white-space: nowrap;
    background: #ffffff;
    color: #0b4a9e;
}
.ybb-ann-card.is-important .ybb-ann-level { background: #1b1f27; color: #f2c94c; }
.ybb-ann-card.is-urgent .ybb-ann-level { background: #ffffff; color: #b42318; }
.ybb-ann-main {
    flex: 1 1 320px;
    min-width: 0;
}
.ybb-ann-title {
    font-weight: 700;
    font-size: 15px;
    word-break: break-word;
}
.ybb-ann-time {
    margin-top: 1px;
    font-size: 12px;
    line-height: 1.5;
    opacity: 0.85;
    word-break: break-word;
}
.ybb-ann-content {
    margin-top: 2px;
    word-break: break-word;
}
.ybb-ann-content p { margin: 0; }
.ybb-ann-content h1,
.ybb-ann-content h2,
.ybb-ann-content h3,
.ybb-ann-content h4,
.ybb-ann-content h5,
.ybb-ann-content h6 {
    font-size: 15px;
    margin: 4px 0 2px;
}
.ybb-ann-content ul,
.ybb-ann-content ol { margin: 2px 0 0 18px; padding: 0; }
.ybb-ann-content a { color: inherit; text-decoration: underline; }
.ybb-ann-content code {
    background: rgba(0, 0, 0, 0.18);
    padding: 0 4px;
    border-radius: 3px;
}
.ybb-ann-card.is-important .ybb-ann-content code { background: rgba(0, 0, 0, 0.12); }
.ybb-ann-ctrl {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-left: auto;
}
.ybb-ann-btn,
.ybb-ann-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 10px;
    border: 1px solid currentColor;
    border-radius: 4px;
    background: transparent;
    color: inherit;
    font-size: 12px;
    line-height: 1.5;
    white-space: nowrap;
    cursor: pointer;
}
.ybb-ann-close {
    padding: 4px 8px;
    font-size: 16px;
    line-height: 1.2;
}
.ybb-ann-btn:hover,
.ybb-ann-close:hover { filter: brightness(1.15); }
.ybb-ann-btn:focus,
.ybb-ann-close:focus { outline: 2px solid currentColor; outline-offset: 2px; }
.ybb-ann-count {
    font-size: 12px;
    white-space: nowrap;
}
@media (prefers-color-scheme: dark) {
    .ybb-ann {
        --ybb-ann-page-bg: #12151b;
        --ybb-ann-page-text: #eef1f6;
        --ybb-ann-page-border: #3a414d;
    }
}
@media (max-width: 640px) {
    .ybb-ann { padding: 8px 10px; font-size: 13px; }
    .ybb-ann-card { padding: 9px 10px; }
    .ybb-ann-ctrl { margin-left: 0; width: 100%; }
}