/**
 * 首页专用样式
 */

/* ========================================
   1. 首页容器
   ======================================== */
.index-page {
    flex: 1;
}

/* ========================================
   2. Hero 区域（首屏横幅）
   ======================================== */
.hero-section {
    background: linear-gradient(135deg, #f8f5f0 0%, #ede5d8 50%, #e8dfd0 100%);
    padding: var(--spacing-xxl) 0;
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.hero-content {
    flex: 1;
    max-width: 520px;
}

.hero-title {
    font-size: var(--font-size-xxxl);
    font-weight: 700;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.hero-image {
    flex: 1;
    max-width: 480px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    aspect-ratio: 16/10;
}

/* ========================================
   3. 内容区块
   ======================================== */
.section {
    padding: var(--spacing-xl) 0;
}

.section-alt {
    background-color: var(--color-bg-secondary);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: 600;
    color: var(--color-text);
    position: relative;
    padding-left: 14px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 22px;
    background-color: var(--color-primary);
    border-radius: 2px;
}

.section-more {
    color: var(--color-primary);
    font-size: var(--font-size-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.section-more:hover {
    gap: 4px;
}

/* ========================================
   4. 卡片通用增强
   ======================================== */
.card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.card-cover {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    display: block;
    transition: transform var(--transition-normal);
}

.card:hover .card-cover {
    transform: scale(1.03);
}

.card-body {
    padding: var(--spacing-md) 0 0;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.4;
    margin-bottom: var(--spacing-xs);
    /* 两行截断 */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

.card-summary {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
    /* 三行截断 */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-author {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

.meta-date::before {
    content: '📅 ';
    font-style: normal;
}

/* ========================================
   5. 文章卡片
   ======================================== */
.article-card {
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.article-card .card-link {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-card .card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
}

/* 无封面图时的文章卡片 */
.article-card .card-body:has(+ .card-cover),
.article-card:not(:has(.card-cover)) .card-body {
    padding-top: var(--spacing-md);
}

/* ========================================
   6. 相册卡片
   ======================================== */
.album-card {
    overflow: hidden;
}

.album-card .card-link {
    display: block;
}

.album-card .card-body {
    padding: var(--spacing-sm) 0 0;
}

.album-card .card-title {
    font-size: var(--font-size-md);
    -webkit-line-clamp: 1;
}

/* ========================================
   7. 百科卡片
   ======================================== */
.encyclopedia-card {
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.encyclopedia-card .card-link {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.encyclopedia-card .card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
}

/* ========================================
   8. 图书馆卡片
   ======================================== */
.book-card {
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.book-card .card-link {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-card .card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
}

/* 无封面图时显示占位符 */
.book-card:not(:has(.card-cover)) .card-body,
.album-card:not(:has(.card-cover)) .card-body,
.article-card:not(:has(.card-cover)) .card-body,
.encyclopedia-card:not(:has(.card-cover)) .card-body {
    position: relative;
}

.book-card:not(:has(.card-cover))::before,
.album-card:not(:has(.card-cover))::before,
.article-card:not(:has(.card-cover))::before,
.encyclopedia-card:not(:has(.card-cover))::before {
    content: '';
    display: block;
    width: 100%;
    aspect-ratio: 16/10;
    background: linear-gradient(135deg, #f0ebe3 0%, #e8dfd0 100%);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.book-card:not(:has(.card-cover)) .card-body,
.album-card:not(:has(.card-cover)) .card-body,
.article-card:not(:has(.card-cover)) .card-body,
.encyclopedia-card:not(:has(.card-cover)) .card-body {
    padding-top: 0;
}

/* ========================================
   9. 响应式适配
   ======================================== */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-image {
        max-width: 100%;
        margin-top: var(--spacing-lg);
    }

    .grid-4 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .hero-section {
        padding: var(--spacing-lg) 0;
    }

    .hero-title {
        font-size: var(--font-size-xxl);
    }

    .hero-subtitle {
        font-size: var(--font-size-md);
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: var(--font-size-xl);
    }
}