/* 预览按钮：极简、彩色、紧凑 */
.libra-preview-btn {
    display: inline-block !important;
    width: max-content !important;
    height: auto !important;
    padding: 1px 4px !important;
    margin-left: 3px !important;
    
    font-size: 11px !important;
    font-weight: bold;
    line-height: 1.2 !important;
    cursor: pointer;
    
    /* 渐变彩色背景 */
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: white !important;
    
    border-radius: 3px;
    border: none;
    white-space: nowrap;
    vertical-align: baseline;
    box-shadow: 0 1px 3px rgba(110, 142, 251, 0.3);

    /* --- 新增：默认隐藏并增加平滑过渡 --- */
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
    pointer-events: none; /* 隐藏时不可点击，防止误触 */
}

/* --- 新增：当鼠标移动到包含标题的容器时，显示按钮 --- */
/* 这里假设 2libra 的帖子容器包含 title-link，我们通过父级状态控制子级 */
div:hover > a.title-link .libra-preview-btn,
a.title-link:hover .libra-preview-btn {
    opacity: 1;
    pointer-events: auto;
}

/* 遮罩层 */
#libra-preview-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 999998;
}

/* 弹窗容器 */
#libra-preview-modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 85vw;
    height: 85vh;
    background: #fff;
    z-index: 999999;
    flex-direction: column;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

.libra-modal-header {
    padding: 10px 20px;
    background: #fdfdfd;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #eee;
}

.libra-modal-title { font-weight: bold; color: #555; font-size: 13px; }

.libra-close-btn {
    cursor: pointer;
    font-size: 12px;
    color: #999;
    padding: 2px 8px;
    border: 1px solid #eee;
    border-radius: 4px;
}

#libra-preview-iframe { flex: 1; width: 100%; border: none; }