/**
 * DripSafe Design System - Post Card Component CSS
 * Version: 1.0.0
 * 基于杨过的视觉设计规范
 */

/* ============================
   Post Card Variables
   ============================ */

:root {
    --ds-card-padding: 20px;
    --ds-card-gap: 24px;
    --ds-card-radius: 12px;
    --ds-card-image-ratio: 16 / 10;
    --ds-card-thumb-radius: 12px 12px 0 0;
    --ds-card-title-size: 18px;
    --ds-card-excerpt-size: 14px;
    --ds-card-meta-size: 13px;
    --ds-card-avatar-size: 24px;
    --ds-card-shadow: var(--ds-shadow-md);
    --ds-card-shadow-hover: var(--ds-shadow-xl);
    --ds-card-transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* ============================
   Base Card Styles
   ============================ */

.ds-card-article {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--ds-bg-card);
    border-radius: var(--ds-card-radius);
    overflow: hidden;
    box-shadow: var(--ds-card-shadow);
    transition: var(--ds-card-transition);
}

.ds-card-article:hover {
    transform: translateY(-4px);
    box-shadow: var(--ds-card-shadow-hover);
}

.ds-card-link {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    height: 100%;
}

/* ============================
   Thumbnail Area
   ============================ */

.ds-card-thumb {
    position: relative;
    width: 100%;
    aspect-ratio: var(--ds-card-image-ratio);
    overflow: hidden;
    background: var(--ds-bg-secondary);
}

.ds-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.ds-card-article:hover .ds-card-thumb img {
    transform: scale(1.05);
}

/* ============================
   Category Tag (蓝青渐变)
   ============================ */

.ds-card-category {
    position: absolute;
    top: 12px;
    left: 12px;
    display: inline-flex;
    align-items: center;
    padding: 4px 12px;
    font-size: 11px;
    font-weight: 600;
    color: #ffffff;
    border-radius: 4px;
    letter-spacing: 0.3px;
    z-index: 1;
    transition: opacity 0.2s ease;
}

.ds-card-article:hover .ds-card-category {
    opacity: 0.95;
}

/* ============================
   Badge (置顶/原创等)
   ============================ */

.ds-card-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 600;
    color: #ffffff;
    background: var(--ds-error);
    border-radius: 4px;
    margin-right: 8px;
}

.ds-card-badge--sticky {
    background: linear-gradient(135deg, #FF6B6B, #FF8E53);
}

.ds-card-badge--original {
    background: linear-gradient(135deg, var(--ds-primary), var(--ds-secondary));
}

/* ============================
   Card Content
   ============================ */

.ds-card-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: var(--ds-card-padding);
    flex: 1;
}

/* ============================
   Card Title
   ============================ */

.ds-card-title {
    font-size: var(--ds-card-title-size);
    font-weight: 600;
    line-height: 1.4;
    color: var(--ds-text-primary);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.2s ease;
}

.ds-card-article:hover .ds-card-title {
    color: var(--ds-primary);
}

/* ============================
   Card Excerpt
   ============================ */

.ds-card-excerpt {
    font-size: var(--ds-card-excerpt-size);
    line-height: 1.6;
    color: var(--ds-text-secondary);
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

/* ============================
   Card Meta (元信息)
   ============================ */

.ds-card-meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: var(--ds-card-meta-size);
    color: var(--ds-text-muted);
    margin-top: auto;
    padding-top: 12px;
    border-top: 1px solid var(--ds-border-light);
}

.ds-card-meta > span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.ds-card-meta i,
.ds-card-meta svg {
    font-size: 14px;
    width: 14px;
    height: 14px;
}

/* 作者区域 */
.ds-meta-author {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.ds-card-avatar {
    width: var(--ds-card-avatar-size);
    height: var(--ds-card-avatar-size);
    border-radius: 50%;
    object-fit: cover;
}

.ds-meta-author-name {
    font-weight: 500;
    color: var(--ds-text-secondary);
}

/* 日期 */
.ds-meta-date {
    color: var(--ds-text-muted);
}

/* 原创/来源标签 */
.ds-meta-tag {
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 500;
    background: var(--ds-bg-secondary);
    color: var(--ds-text-secondary);
    border-radius: 4px;
}

.ds-meta-original {
    background: linear-gradient(135deg, var(--ds-primary), var(--ds-secondary));
    color: #ffffff;
}

/* 浏览量 */
.ds-meta-views {
    margin-left: auto;
}

/* ============================
   Card Style Variants
   ============================ */

/* 水平卡片 (左图右文) */
.ds-card-article--horizontal {
    flex-direction: row;
}

.ds-card-article--horizontal .ds-card-thumb {
    width: 280px;
    min-width: 280px;
    aspect-ratio: auto;
    height: 100%;
    border-radius: var(--ds-card-radius) 0 0 var(--ds-card-radius);
}

.ds-card-article--horizontal .ds-card-content {
    justify-content: center;
}

@media (max-width: 767px) {
    .ds-card-article--horizontal {
        flex-direction: column;
    }
    
    .ds-card-article--horizontal .ds-card-thumb {
        width: 100%;
        min-width: auto;
        aspect-ratio: 16 / 9;
        border-radius: var(--ds-card-radius) var(--ds-card-radius) 0 0;
    }
}

/* 简约卡片 (无图) */
.ds-card-article--minimal .ds-card-content {
    padding: 16px;
}

.ds-card-article--minimal .ds-card-title {
    -webkit-line-clamp: 3;
}

.ds-card-article--minimal .ds-card-meta {
    border-top: none;
    padding-top: 8px;
}

/* ============================
   Card List (列表布局)
   ============================ */

.ds-card-list {
    display: flex;
    flex-direction: column;
    gap: var(--ds-card-gap);
}

.ds-card-list .ds-card-article {
    flex-direction: row;
}

.ds-card-list .ds-card-thumb {
    width: 240px;
    min-width: 240px;
    aspect-ratio: 4 / 3;
    border-radius: var(--ds-card-radius) 0 0 var(--ds-card-radius);
}

@media (max-width: 767px) {
    .ds-card-list .ds-card-article {
        flex-direction: column;
    }
    
    .ds-card-list .ds-card-thumb {
        width: 100%;
        min-width: auto;
        aspect-ratio: 16 / 9;
        border-radius: var(--ds-card-radius) var(--ds-card-radius) 0 0;
    }
}

/* ============================
   Dark Mode Support
   ============================ */

[data-theme="dark"] .ds-card-article {
    background: var(--ds-bg-card);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .ds-card-article:hover {
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .ds-card-title {
    color: var(--ds-text-primary);
}

[data-theme="dark"] .ds-card-title:hover {
    color: var(--ds-secondary);
}

[data-theme="dark"] .ds-card-excerpt {
    color: var(--ds-text-secondary);
}

[data-theme="dark"] .ds-card-meta {
    border-top-color: var(--ds-border);
    color: var(--ds-text-muted);
}

[data-theme="dark"] .ds-meta-tag {
    background: var(--ds-bg-secondary);
}

[data-theme="dark"] .ds-meta-author-name {
    color: var(--ds-text-secondary);
}

/* ============================
   Responsive
   ============================ */

@media (max-width: 767px) {
    :root {
        --ds-card-padding: 16px;
        --ds-card-gap: 16px;
        --ds-card-title-size: 16px;
        --ds-card-excerpt-size: 13px;
        --ds-card-meta-size: 12px;
        --ds-card-avatar-size: 20px;
    }
}