/* ================================
   Blog (dùng chung biến màu của styles.css)
================================ */
.blog-main {
    position: relative;
    z-index: 1;
    padding-top: 90px;
    min-height: 70vh;
}

.blog-hero {
    padding: 70px 0 40px;
    text-align: center;
}

.blog-hero-title {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    background: var(--gradient-aurora);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.blog-hero-sub {
    max-width: 640px;
    margin: 0 auto;
    color: var(--text-light);
    font-size: 1.1rem;
}

.blog-hero-sub a {
    color: var(--secondary-color);
    text-decoration: none;
}

.blog-hero-sub a:hover { text-decoration: underline; }

.blog-posts { padding: 20px 0 80px; }

.blog-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.blog-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.filter-btn {
    padding: 0.5rem 1.2rem;
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 25px;
    background: var(--glass-bg);
    color: var(--text-light);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary-color);
    color: var(--star-white);
    border-color: transparent;
}

.blog-search {
    position: relative;
}

.blog-search i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.blog-search input {
    padding: 0.55rem 1rem 0.55rem 2.5rem;
    width: 240px;
    max-width: 100%;
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 25px;
    background: var(--glass-bg);
    color: var(--text-color);
    font-family: inherit;
    outline: none;
}

.blog-search input:focus { border-color: var(--primary-color); box-shadow: var(--shadow-glow-sm); }

.post-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.8rem;
}

.post-card {
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    border: 1px solid rgba(168, 85, 247, 0.2);
    border-radius: 18px;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.post-card:hover {
    transform: translateY(-6px);
    background: var(--card-bg-hover);
    box-shadow: var(--shadow-glow);
}

.post-cover {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--star-white);
    background: var(--gradient-nebula);
}

.post-body { padding: 1.4rem; display: flex; flex-direction: column; gap: 0.7rem; flex: 1; }

.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1rem;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.post-category {
    padding: 0.15rem 0.7rem;
    border-radius: 12px;
    background: rgba(78, 205, 196, 0.15);
    color: var(--secondary-color);
    font-weight: 500;
}

.post-title { font-size: 1.25rem; }

.post-excerpt { color: var(--text-light); font-size: 0.95rem; flex: 1; }

.post-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.post-empty { text-align: center; color: var(--text-light); padding: 3rem 0; }

/* ---------- Trang đọc bài ---------- */
.article-container { max-width: 780px; padding-top: 40px; padding-bottom: 80px; }

.back-link {
    display: inline-block;
    margin-bottom: 1.5rem;
    color: var(--text-light);
    text-decoration: none;
}

.back-link:hover { color: var(--secondary-color); }

.article-header h1 { font-size: 2.4rem; margin: 1rem 0; }

.article-header { margin-bottom: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid rgba(168, 85, 247, 0.2); }

.article-content { font-size: 1.05rem; line-height: 1.85; color: var(--text-color); }

.article-content h2 { font-size: 1.6rem; margin: 2.2rem 0 0.8rem; }
.article-content h3 { font-size: 1.3rem; margin: 1.8rem 0 0.6rem; }
.article-content p { margin-bottom: 1.1rem; }
.article-content ul, .article-content ol { margin: 0 0 1.2rem 1.5rem; }
.article-content li { margin-bottom: 0.4rem; }
.article-content a { color: var(--secondary-color); }
.article-content img { max-width: 100%; border-radius: 12px; margin: 1rem 0; }

.article-content code {
    padding: 0.15rem 0.45rem;
    border-radius: 6px;
    background: rgba(168, 85, 247, 0.15);
    font-family: 'SFMono-Regular', Consolas, monospace;
    font-size: 0.9em;
}

.article-content pre {
    margin: 0 0 1.4rem;
    padding: 1.1rem 1.3rem;
    overflow-x: auto;
    border: 1px solid rgba(168, 85, 247, 0.25);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.45);
}

.article-content pre code { padding: 0; background: none; }

.article-content blockquote {
    margin: 1.4rem 0;
    padding: 0.8rem 1.2rem;
    border-left: 4px solid var(--primary-color);
    background: var(--card-bg);
    border-radius: 0 10px 10px 0;
    color: var(--text-light);
    font-style: italic;
}

.article-nav {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin-top: 3rem;
}

.article-nav a {
    flex: 1;
    max-width: 48%;
    padding: 1rem 1.2rem;
    border: 1px solid rgba(168, 85, 247, 0.25);
    border-radius: 12px;
    background: var(--card-bg);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
}

.article-nav a:hover { box-shadow: var(--shadow-glow-sm); border-color: var(--primary-color); }
.article-nav a.next { text-align: right; }
.article-nav small { display: block; color: var(--text-muted); margin-bottom: 0.2rem; }

.post-notfound { text-align: center; padding: 4rem 0; }
.post-notfound a { color: var(--secondary-color); }

@media (max-width: 768px) {
    .blog-hero { padding-top: 40px; }
    .blog-hero-title { font-size: 2rem; }
    .article-header h1 { font-size: 1.8rem; }
    .post-grid { grid-template-columns: 1fr; }
    .blog-search input { width: 100%; }
    .blog-search { width: 100%; }
    .article-nav { flex-direction: column; }
    .article-nav a { max-width: none; }
}