/* ─── Blog Index Header ──────────────────────────────────────────────────── */
.blog-index-header {
    padding: 32px 24px 20px;
    margin-bottom: 20px;
}

.blog-index-header .subtitle {
    padding: 0 24px 16px;
    font-size: 0.95em;
    color: var(--color-muted);
}

h1 {
    font-size: 2em;
    color: var(--color-text);
    font-weight: 700;
}

/* ─── Post List ──────────────────────────────────────────────────────────── */
#postList {
    list-style: none;
    display: grid;
    gap: 0;
}

#postList .post-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-top: none;
    transition: background 0.12s;
}

#postList .post-card:first-child {
    border-top: 1px solid var(--color-border);
}

#postList .post-card:hover {
    background: var(--color-accent-subtle);
}

.post-card-link {
    display: block;
    padding: 20px 24px 10px;
    color: var(--color-text);
    text-decoration: none;
    border-left: 3px solid var(--color-accent);
}

.post-card-link:hover {
    text-decoration: none;
}

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

.post-card-title {
    font-size: 1.1em;
    font-weight: 600;
    margin-bottom: 6px;
    transition: color 0.12s;
}

.post-card-date {
    display: block;
    font-size: 0.8em;
    color: var(--color-muted);
    margin-bottom: 6px;
}

.post-card-desc {
    color: var(--color-muted);
    line-height: 1.6;
    font-size: 0.925em;
}

.post-card .tag-list {
    padding: 8px 24px 16px 27px;
}

/* ─── Filter Label ───────────────────────────────────────────────────────── */
.filter-label {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 10px 16px;
    margin-bottom: 16px;
    color: var(--color-muted);
    font-size: 0.875em;
}

.filter-label a {
    color: var(--color-accent);
    font-weight: 600;
}

/* ─── Tags ───────────────────────────────────────────────────────────────── */
.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag-chip {
    display: inline-block;
    padding: 3px 10px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-muted);
    font-size: 0.8em;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.12s, color 0.12s, border-color 0.12s;
}

.tag-chip:hover {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    border-color: var(--color-accent);
    text-decoration: none;
}

/* ─── Blog Post Header ───────────────────────────────────────────────────── */
.blog-post-header {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: 32px 40px;
    margin-bottom: 0;
}

.blog-post-header h1 {
    font-size: 2em;
    color: var(--color-text);
    margin-bottom: 14px;
    text-align: left;
}

.blog-post-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    color: var(--color-muted);
    font-size: 0.875em;
}

/* ─── Blog Post Content ──────────────────────────────────────────────────── */
.blog-content {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-top: none;
    padding: 40px;
}

.blog-content h1 {
    font-size: 1.8em;
    color: var(--color-text);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-border);
    text-align: left;
}

.blog-content h2 {
    font-size: 1.4em;
    color: var(--color-text);
    margin-top: 32px;
    margin-bottom: 14px;
    font-weight: 600;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.blog-content h3 {
    font-size: 1.15em;
    color: var(--color-text);
    margin-top: 24px;
    margin-bottom: 10px;
    font-weight: 600;
}

.blog-content h4 {
    font-size: 1em;
    color: var(--color-muted);
    margin-top: 18px;
    margin-bottom: 8px;
    font-weight: 600;
}

.blog-content p {
    color: #374151;
    line-height: 1.8;
    margin-bottom: 16px;
    font-size: 1.025em;
}

.blog-content ul,
.blog-content ol {
    margin-left: 24px;
    margin-bottom: 16px;
    color: #374151;
}

.blog-content li {
    margin-bottom: 6px;
    line-height: 1.7;
}

.blog-content a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

.blog-content a:hover {
    color: var(--color-accent-hover);
    text-decoration: underline;
}

.blog-content blockquote {
    border-left: 4px solid var(--color-accent);
    padding: 14px 22px;
    margin: 24px 0;
    background: var(--color-accent-subtle);
    color: var(--color-text);
    font-style: italic;
}

.blog-content code {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 1px 6px;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.88em;
    color: #dc2626;
}

.blog-content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 20px;
    overflow-x: auto;
    margin: 20px 0;
    border: 1px solid #334155;
}

.blog-content pre code {
    background: none;
    border: none;
    padding: 0;
    color: inherit;
    font-size: 0.925em;
}

.blog-content img {
    max-width: 100%;
    height: auto;
    margin: 24px 0;
    border: 1px solid var(--color-border);
}

.blog-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 32px 0;
}

.blog-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 0.925em;
}

.blog-content table th,
.blog-content table td {
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    text-align: left;
}

.blog-content table th {
    background: var(--color-bg);
    font-weight: 700;
    color: var(--color-text);
}

.blog-content table tr:hover {
    background: var(--color-accent-subtle);
}

/* ─── Math display block (raw \[ \] before typeset) ─────────────────────── */
.blog-content .math-display {
    display: block;
    margin: 24px 0;
    padding: 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    overflow-x: auto;
    text-align: center;
}

/* ─── Math Styling ───────────────────────────────────────────────────────── */
.blog-content .MathJax {
    font-size: 1.1em !important;
}

.blog-content mjx-container {
    overflow-x: auto;
    overflow-y: hidden;
}

/* Display Math */
.blog-content mjx-container[display="true"] {
    margin: 24px 0;
    padding: 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

/* Inline Math */
.blog-content mjx-container[display="false"] {
    display: inline-block;
    margin: 0 2px;
}

/* ─── Empty / Loading States ─────────────────────────────────────────────── */
.empty-state {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    text-align: center;
    padding: 60px 20px;
    color: var(--color-muted);
}

.empty-state-icon {
    font-size: 3em;
    margin-bottom: 12px;
}

.empty-state-text {
    font-size: 1.1em;
}

.loading {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    text-align: center;
    padding: 48px 20px;
    color: var(--color-muted);
    font-size: 0.95em;
}

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    h1 { font-size: 1.6em; }

    .blog-content { padding: 24px; }
    .blog-post-header { padding: 24px; }

    .blog-content h1 { font-size: 1.5em; }
    .blog-content h2 { font-size: 1.25em; }
    .blog-content h3 { font-size: 1.1em; }

    .post-card-link { padding: 16px 20px 8px; }
    .post-card .tag-list { padding: 6px 20px 14px 23px; }
}

@media (max-width: 480px) {
    h1 { font-size: 1.4em; }

    .blog-content { padding: 18px; }
    .blog-post-header { padding: 18px; }

    .blog-content pre { padding: 14px; font-size: 0.875em; }

    .post-card-link { padding: 14px 16px 8px; }
    .post-card .tag-list { padding: 4px 16px 12px 19px; }
}