/* Blog Page Styles */
.blog-page {
    background: var(--fb-white);
    min-height: 100vh;
}

/* Hero Section */
.blog-hero {
    padding: 80px 24px 60px;
    max-width: 1280px;
    margin: 0 auto;
}

.blog-hero h1 {
    font-size: 56px;
    font-weight: 900;
    letter-spacing: -2px;
    margin: 0 0 16px;
    color: var(--fb-ink-strong);
}

.blog-hero p {
    font-size: 20px;
    color: var(--fb-gray-text);
    max-width: 600px;
    margin: 0;
    line-height: 1.5;
}

/* Category Navigation */
.blog-nav {
    border-bottom: 1px solid var(--fb-gray-200);
    background: var(--fb-white);
    position: sticky;
    top: var(--nav-height);
    z-index: 80;
    position: relative;
}

.blog-nav::after {
    content: '';
    position: absolute;
    right: 0; top: 0; bottom: 0;
    width: 48px;
    background: linear-gradient(to right, transparent, var(--fb-white));
    pointer-events: none;
    z-index: 1;
}

.blog-nav-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    padding-right: 48px;
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.blog-nav-inner::-webkit-scrollbar {
    display: none;
}

.blog-nav-link {
    padding: 16px 20px;
    font-size: 14px;
    font-weight: 600;
    color: var(--fb-ink-soft);
    text-decoration: none;
    white-space: nowrap;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.blog-nav-link:hover {
    color: var(--fb-ink);
}

.blog-nav-link.active {
    color: var(--fb-ink-strong);
    border-bottom-color: var(--fb-ink-strong);
}

/* Main Content */
.blog-content {
    max-width: 1280px;
    margin: 0 auto;
    padding: 48px 24px 80px;
}

/* Featured Article */
.featured-article {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 48px;
    margin-bottom: 80px;
    align-items: center;
    text-decoration: none;
}

.featured-image {
    aspect-ratio: 4/3;
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    background: linear-gradient(90deg, var(--fb-gray-100) 25%, var(--fb-gray-200) 50%, var(--fb-gray-100) 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
}
@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

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

.featured-article:hover .featured-image img {
    transform: scale(1.03);
}

.featured-badge {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    color: var(--fb-blue);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
}

.featured-title {
    font-size: 38px;
    font-weight: 900;
    line-height: 1.15;
    margin: 0 0 20px;
    color: var(--fb-ink-strong);
    letter-spacing: -0.5px;
}

.featured-summary {
    font-size: 17px;
    color: var(--fb-gray-text);
    line-height: 1.65;
    margin: 0 0 24px;
}

.featured-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 14px;
    color: var(--fb-gray-text);
}

.featured-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.author-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--fb-blue), #5a9cb8);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
    font-weight: 700;
}

.featured-read-more {
    font-size: 15px;
    font-weight: 600;
    color: var(--fb-ink-strong);
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
}

.featured-read-more svg {
    transition: transform 0.2s;
}

.featured-article:hover .featured-read-more svg {
    transform: translateX(4px);
}

/* Section Title */
.section-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.section-title-row h2 {
    font-size: 28px;
    font-weight: 800;
    margin: 0;
    color: var(--fb-ink-strong);
}

.view-all-btn {
    font-size: 14px;
    font-weight: 600;
    color: var(--fb-blue);
    text-decoration: none;
}

.view-all-btn:hover {
    text-decoration: underline;
}

/* Article Grid */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

/* Article Card */
.article-card {
    display: block;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.article-card:hover {
    transform: translateY(-4px);
}

.article-card-image {
    aspect-ratio: 16/10;
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 20px;
    position: relative;
    background: linear-gradient(90deg, var(--fb-gray-100) 25%, var(--fb-gray-200) 50%, var(--fb-gray-100) 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
}

.article-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

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

.article-card-category {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    color: var(--fb-blue);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-card-body {
    padding: 0 4px;
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 13px;
    color: var(--fb-gray-text);
}

.article-card-title {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.3;
    margin: 0 0 12px;
    color: var(--fb-ink-strong);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-summary {
    font-size: 15px;
    color: var(--fb-gray-text);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin: 0;
}

/* Tags Row */
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.article-tag {
    padding: 5px 12px;
    background: var(--fb-gray-100);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    color: var(--fb-ink-soft);
}

/* Newsletter Section */
.newsletter-section {
    background: linear-gradient(135deg, #1a3a4a 0%, #2d5a6e 50%, #3a6f8c 100%);
    border-radius: 24px;
    padding: 64px;
    margin-top: 80px;
    text-align: center;
    color: white;
}

.newsletter-section h3 {
    font-size: 32px;
    font-weight: 800;
    margin: 0 0 12px;
}

.newsletter-section p {
    font-size: 17px;
    opacity: 0.9;
    margin: 0 0 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.newsletter-form {
    display: flex;
    max-width: 460px;
    margin: 0 auto;
    gap: 12px;
}

.newsletter-form input {
    flex: 1;
    padding: 14px 20px;
    border: none;
    border-radius: 50px;
    font-size: 15px;
    outline: none;
}

.newsletter-form button {
    padding: 14px 28px;
    background: white;
    color: var(--fb-ink-strong);
    border: none;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.newsletter-form button:hover {
    transform: scale(1.02);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 24px;
    color: var(--fb-gray-text);
}

.empty-state h3 {
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 12px;
    color: var(--fb-ink);
}

/* Responsive */
@media (max-width: 1024px) {
    .featured-article {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .featured-title {
        font-size: 32px;
    }

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

@media (max-width: 768px) {
    .blog-hero h1 {
        font-size: 40px;
    }

    .blog-hero p {
        font-size: 17px;
    }

    /* 左侧额外留白，避免与 iOS 边缘返回手势冲突 */
    .blog-nav-inner {
        padding-left: 16px;
        gap: 4px;
    }

    .blog-nav-link {
        padding: 12px 10px;
        font-size: 13px;
    }

    .article-grid {
        grid-template-columns: 1fr;
    }

    .newsletter-section {
        padding: 48px 24px;
    }

    .newsletter-form {
        flex-direction: column;
    }
}