/* 
 * 链接预览卡片样式
 * 为内部链接（跳转到其他子页面的链接）提供悬停预览功能
 */

/* 预览卡片容器 */
.link-preview-card {
    position: absolute;
    z-index: 9999;
    width: 400px;
    max-width: 90vw;
    max-height: 80vh;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px) scale(0.95);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s linear 0.3s;
    pointer-events: none;
    overflow-y: auto;
    overflow-x: hidden;
}

/* 显示状态 */
.link-preview-card.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0s linear 0s;
}

/* 预览卡片内容 */
.link-preview-content {
    padding: var(--spacing-3);
}

/* 预览卡片标题 */
.link-preview-title {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--accent);
    margin-bottom: var(--spacing-2);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 预览卡片描述 */
.link-preview-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-2);
    word-wrap: break-word;
    word-break: break-word;
    white-space: normal;
    /* 移除line-clamp限制，允许完整显示150字 */
    display: block;
    overflow: visible;
}

/* 预览卡片元数据 */
.link-preview-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding-top: var(--spacing-2);
    border-top: 1px solid var(--card-border);
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.link-preview-date {
    flex: 1;
}

.link-preview-type {
    padding: 0.2rem 0.6rem;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* 预览卡片加载状态 */
.link-preview-loading {
    padding: var(--spacing-4);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.link-preview-loading::after {
    content: '...';
    animation: link-preview-dots 1.5s steps(4, end) infinite;
}

@keyframes link-preview-dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* 预览卡片错误状态 */
.link-preview-error {
    padding: var(--spacing-3);
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.85rem;
}

/* 内部链接标识 */
a[data-internal-link="true"] {
    position: relative;
    cursor: pointer;
}

/* 确保预览卡片不会超出视窗 */
.link-preview-card.position-top {
    transform: translateY(-8px) scale(0.95);
}

.link-preview-card.position-top.visible {
    transform: translateY(0) scale(1);
}

.link-preview-card.position-left {
    transform: translateX(-8px) scale(0.95);
}

.link-preview-card.position-left.visible {
    transform: translateX(0) scale(1);
}

.link-preview-card.position-right {
    transform: translateX(8px) scale(0.95);
}

.link-preview-card.position-right.visible {
    transform: translateX(0) scale(1);
}

/* 暗色模式适配 */
[data-theme="dark"] .link-preview-card,
.dark-theme .link-preview-card {
    background-color: var(--card-bg);
    border-color: var(--card-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .link-preview-loading,
.dark-theme .link-preview-loading {
    color: var(--text-tertiary);
}

/* 移动端适配 */
@media (max-width: 768px) {
    .link-preview-card {
        width: calc(100vw - 32px);
        max-width: calc(100vw - 32px);
        max-height: 70vh;
        display: block;
        pointer-events: auto; /* 移动端允许点击 */
    }
    
    /* 移动端描述也完整显示 */
    .link-preview-description {
        display: block;
        overflow: visible;
        word-wrap: break-word;
        word-break: break-word;
        white-space: normal;
    }
    
    /* 移动端预览卡片可见时允许交互 */
    .link-preview-card.visible {
        pointer-events: auto;
    }
}

/* 可访问性：减少动画（尊重用户偏好） */
@media (prefers-reduced-motion: reduce) {
    .link-preview-card {
        transition: opacity 0.1s ease;
    }
    
    .link-preview-loading::after {
        animation: none;
    }
}