/* ============================================
   首页样式
   ============================================ */

/* 首页加宽容器：覆盖全局 1100px 限制，提升页面利用率 */
body.home-page .container {
    max-width: 1320px;
}

/* Hero */
.hero-section {
    text-align: center;
    padding: 56px 20px 36px;
}

/* Hero 大 Logo */
.hero-logo {
    display: flex;
    align-items: baseline;
    justify-content: center;
    letter-spacing: -0.04em;
    margin-bottom: 16px;
}

.hl-w {
    font-family: 'Space Grotesk', var(--font-sans);
    font-size: 4rem;
    font-weight: 700;
    color: var(--text-heading);
}

.hl-dot {
    display: inline-block;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    position: relative;
    top: -6px;
    margin: 0 2px;
}

.hl-ai {
    font-family: 'Space Grotesk', var(--font-sans);
    font-size: 4rem;
    font-weight: 400;
    color: var(--text-secondary);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--text-heading);
    margin: 0 0 0.5rem;
    background: linear-gradient(135deg, var(--accent), var(--accent-light), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    border: none;
    padding: 0;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin: 0 0 1.5rem;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
}

.tag-pill {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    background: var(--tag-bg);
    color: var(--accent);
    border: 1px solid rgba(99,102,241,0.15);
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.tag-pill:hover {
    background: rgba(99,102,241,0.15);
    border-color: var(--accent);
    transform: translateY(-1px);
}

.tag-pill.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

/* 搜索框 */
.search-wrapper {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 0 auto 1rem;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 10px 16px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.12);
}

.search-icon { font-size: 1rem; margin-right: 10px; opacity: 0.5; }
.search-input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1rem;
    color: var(--text-primary);
    outline: none;
    font-family: var(--font-sans);
}
.search-input::placeholder { color: var(--text-tertiary); }

.search-shortcut {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}


.no-results {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

/* 区块标题 */
.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border-color);
    letter-spacing: 0.3px;
}

.section-title .more {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-tertiary);
    letter-spacing: 1px;
    text-transform: uppercase;
}

/* 内容区 */
.content-section {
    padding: 0 0 24px;
}

/* 精选文章卡片 - 横向大卡片 */
.featured-card {
    display: flex;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
    margin-bottom: 40px;
    position: relative;
    min-height: 320px;
}

.featured-card::before {
    content: '★ 精选';
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #fff;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    z-index: 2;
    letter-spacing: 1px;
}

.featured-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 30px rgba(99,102,241,0.12);
    transform: translateY(-3px);
}

.featured-img {
    width: 52%;
    min-height: 320px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light), var(--accent-cyan));
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.featured-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.featured-card:hover .featured-img img {
    transform: scale(1.05);
}

.featured-img-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent), var(--accent-light), var(--accent-cyan));
}

.featured-badge {
    position: absolute;
    bottom: 14px;
    left: 14px;
    background: rgba(255,255,255,0.95);
    color: var(--accent);
    padding: 5px 14px;
    border-radius: 8px;
    font-size: 0.82rem;
    font-weight: 600;
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    letter-spacing: 0.3px;
}

.featured-body {
    padding: 28px 32px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    flex: 1;
}

.featured-body h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.35;
    color: var(--text-heading);
}

.featured-meta {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.featured-excerpt {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.75;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 16px;
}

.featured-body .read-featured {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--accent);
    font-size: 0.88rem;
    font-weight: 600;
    margin-top: auto;
    transition: gap 0.2s;
}

.featured-card:hover .read-featured {
    gap: 10px;
}

/* 分类筛选条 */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}

.filter-chip {
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-secondary);
    padding: 7px 18px;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    line-height: 1.2;
}

.filter-chip:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

.filter-chip.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(99,102,241,0.25);
}

/* 文章网格：Bento 马赛克布局——首卡放大，打破均匀框格的死板感 */
.post-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: 1fr;
    gap: 22px;
}

/* 首卡：跨 2 列×两行的大头条 */
.post-grid .post-card:first-child {
    grid-column: span 2;
    grid-row: span 2;
}
.post-grid .post-card:first-child .post-card-img { height: 100%; min-height: 300px; }
.post-grid .post-card:first-child .post-card-link { display: flex; flex-direction: column; height: 100%; }
.post-grid .post-card:first-child .post-card-title { font-size: 1.5rem; -webkit-line-clamp: 3; }
.post-grid .post-card:first-child .post-card-excerpt { -webkit-line-clamp: 4; font-size: 0.95rem; }
.post-grid .post-card:first-child .post-card-body { padding: 22px 24px; }

/* 第 2/3 张：各跨 2 列的横向中卡（图左文右） */
.post-grid .post-card:nth-child(2),
.post-grid .post-card:nth-child(3) {
    grid-column: span 2;
    flex-direction: row;
}
.post-grid .post-card:nth-child(2) .post-card-link,
.post-grid .post-card:nth-child(3) .post-card-link { display: flex; height: 100%; }
.post-grid .post-card:nth-child(2) .post-card-img,
.post-grid .post-card:nth-child(3) .post-card-img { width: 42%; height: auto; min-height: 150px; flex-shrink: 0; }
.post-grid .post-card:nth-child(2) .post-card-body,
.post-grid .post-card:nth-child(3) .post-card-body { flex: 1; }

/* 其余：每张跨 2 列的标准卡（一行两个） */
.post-grid .post-card:nth-child(n+4) {
    grid-column: span 2;
}

@media (max-width: 980px) {
    .post-grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: auto; }
    .post-grid .post-card:first-child,
    .post-grid .post-card:nth-child(2),
    .post-grid .post-card:nth-child(3),
    .post-grid .post-card:nth-child(n+4) { grid-column: span 1; grid-row: auto; flex-direction: column; }
    .post-grid .post-card:nth-child(2) .post-card-img,
    .post-grid .post-card:nth-child(3) .post-card-img { width: 100%; height: 190px; }
    .post-grid .post-card:first-child .post-card-title { font-size: 1.15rem; }
}

.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform 0.3s cubic-bezier(0.22,1,0.36,1), box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: var(--shadow-sm);
}

.post-card:hover {
    border-color: var(--accent);
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.post-card.is-hidden { display: none; }

.post-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.post-card-img {
    height: 190px;
    overflow: hidden;
    background: var(--bg-tertiary);
    position: relative;
}

.post-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.post-card:hover .post-card-img img {
    transform: scale(1.06);
}

.post-card-img-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--placeholder-gradient);
    color: var(--text-tertiary);
    font-size: 0.95rem;
    font-weight: 500;
}

.post-card-body {
    padding: 14px 16px;
}

.post-card-meta {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    margin-bottom: 6px;
}

.meta-dot { color: var(--border-color); }

.post-card-cat {
    color: var(--accent);
    font-weight: 600;
    background: var(--tag-bg);
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.75rem;
    letter-spacing: 0.3px;
}

.post-card-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-heading);
    margin: 0 0 6px;
    line-height: 1.4;
    border: none;
    padding: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

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

.post-card-excerpt {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
    margin: 0 0 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.read-more {
    color: var(--accent);
    font-size: 0.82rem;
    font-weight: 600;
}

.post-card-tags {
    display: flex;
    gap: 4px;
}

.tag-sm {
    color: var(--text-secondary);
    font-size: 0.72rem;
    background: var(--bg-tertiary);
    padding: 2px 8px;
    border-radius: 6px;
    border: 1px solid var(--border-light);
}

/* 分页 */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.page-btn {
    color: var(--accent);
    font-size: 0.88rem;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
    background: var(--bg-card);
}

.page-btn:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.page-info {
    color: var(--text-tertiary);
    font-size: 0.88rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .hero-section {
        padding: 32px 0 24px;
    }

    .hero-title {
        font-size: 1.8rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
    }

    .search-shortcut { display: none; }

    .search-wrapper { max-width: 100%; }


    .post-grid {
        grid-template-columns: 1fr;
        grid-auto-rows: auto;
    }
    .post-grid .post-card:first-child,
    .post-grid .post-card:nth-child(2),
    .post-grid .post-card:nth-child(3),
    .post-grid .post-card:nth-child(n+4) { grid-column: auto; grid-row: auto; }
    .post-grid .post-card:nth-child(2) .post-card-link,
    .post-grid .post-card:nth-child(3) .post-card-link { flex-direction: column; }
    .post-grid .post-card:nth-child(2) .post-card-img,
    .post-grid .post-card:nth-child(3) .post-card-img { width: 100%; height: 190px; }

    .featured-card {
        flex-direction: column;
        min-height: 0;
    }

    .featured-card::before {
        top: 12px;
        right: 12px;
    }

    .featured-img {
        width: 100%;
        min-height: 200px;
    }

    .featured-body {
        padding: 20px;
        justify-content: flex-start;
    }

    .featured-body h3 {
        font-size: 1.2rem;
    }

    .post-card-img {
        height: 140px;
    }

    .post-card-body {
        padding: 12px 14px;
    }

    .post-card-title {
        font-size: 0.95rem;
    }
}