/* ==========================================================================
    BLOG — css/blog.css
    Loaded after /css/style.css on all blog pages.
    style.css provides: CSS variables, nav, footer, utility classes.
    This file provides: blog listing, blog post prose, tag filters.
 ========================================================================== */

/* ==========================================================================
    BLOG INDEX — Listing page
 ========================================================================== */

.blog-header {
    padding: 5rem 0 3rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 0;
}

.blog-header-inner {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.blog-header h1 {
    font-size: clamp(2.25rem, 5vw, 3.5rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.blog-header p {
    max-width: 480px;
    font-size: 1rem;
    color: var(--fg-muted);
    margin-top: 0.75rem;
    line-height: 1.65;
}

.rss-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--fg-dim);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: 0.4rem 0.85rem;
    white-space: nowrap;
    transition: color var(--transition-fast), border-color var(--transition-fast);
    flex-shrink: 0;
}

.rss-link:hover {
    color: var(--fg);
    border-color: var(--border-hover);
}

/* Tag filter pills */
.tag-filters {
    display: flex;
    gap: 0.5rem;
    padding: 1.5rem 0;
    overflow-x: auto;
    scrollbar-width: none;
    border-bottom: 1px solid var(--border);
    /* Fade out trailing edge on mobile */
    mask-image: linear-gradient(to right, black 85%, transparent 100%);
    -webkit-mask-image: linear-gradient(to right, black 85%, transparent 100%);
}

.tag-filters::-webkit-scrollbar {
    display: none;
}

.tag-btn {
    padding: 0.35rem 0.9rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-family: inherit;
    border: 1px solid var(--border);
    color: var(--fg-muted);
    background: transparent;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
    text-transform: capitalize;
}

.tag-btn:hover {
    color: var(--fg);
    border-color: var(--border-hover);
}

.tag-btn[aria-pressed="true"] {
    color: var(--bg);
    background: var(--fg);
    border-color: var(--fg);
}

/* Posts list */
.posts-list {
    list-style: none;
}

.post-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 2rem;
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--border);
    align-items: start;
    transition: opacity var(--transition-fast);
}

.post-item[hidden] {
    display: none;
}

.post-date {
    font-size: 0.8rem;
    color: var(--fg-dim);
    padding-top: 0.25rem;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.post-body {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.post-link {
    display: block;
    color: var(--fg);
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.3;
    letter-spacing: -0.01em;
    transition: color var(--transition-fast);
}

.post-link:hover {
    color: var(--fg-muted);
}

.post-excerpt {
    font-size: 0.9rem;
    color: var(--fg-muted);
    line-height: 1.65;
    /* Clamp to 3 lines */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-footer-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    font-size: 0.78rem;
    color: var(--fg-dim);
    margin-top: 0.25rem;
}

.post-footer-meta .sep {
    opacity: 0.4;
}

.post-tags {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.post-tag-pill {
    display: inline-block;
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    border: 1px solid var(--border);
    color: var(--fg-dim);
    text-transform: capitalize;
    line-height: 1.4;
}

.no-results {
    padding: 4rem 0;
    text-align: center;
    color: var(--fg-dim);
    font-size: 0.95rem;
}

@media (max-width: 600px) {
    .post-item {
        grid-template-columns: 1fr;
        gap: 0.5rem;
        padding: 2rem 0;
    }
}

/* ==========================================================================
    BLOG POST — Article page
 ========================================================================== */

.post-page {
    padding-top: 3rem;
    padding-bottom: 6rem;
}

/* Reading progress bar — thin line at the very top of the viewport */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--fg);
    z-index: 1001;
    pointer-events: none;
    opacity: 0.6;
    will-change: width;
}

.post-back {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--fg-dim);
    margin-bottom: 2.5rem;
    transition: color var(--transition-fast);
}

.post-back:hover {
    color: var(--fg);
}

.post-header {
    max-width: 680px;
    margin-bottom: 3rem;
}

.post-header-tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.post-header-tag {
    display: inline-block;
    padding: 0.25rem 0.65rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    border: 1px solid var(--border);
    color: var(--fg-muted);
    text-transform: capitalize;
}

.post-title {
    font-size: clamp(1.9rem, 4.5vw, 2.75rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.15;
    color: var(--fg);
    margin-bottom: 1.5rem;
}

.post-byline {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.post-byline-text {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.post-author-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--fg);
}

.post-author-role {
    font-size: 0.8rem;
    color: var(--fg-dim);
}

.post-meta-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--fg-dim);
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.post-meta-row .sep {
    opacity: 0.4;
}

/* Cover image */
.post-cover {
    width: 100%;
    max-width: 780px;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    margin-bottom: 3rem;
    display: block;
}

/* ==========================================================================
    PROSE — Markdown rendered content
    All styles are scoped to .prose so they can't bleed into the nav/footer.
 ========================================================================== */
.prose {
    max-width: 680px;
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--fg-muted);
}

.prose h2,
.prose h3,
.prose h4 {
    color: var(--fg);
    letter-spacing: -0.02em;
    margin-top: 2.5rem;
    margin-bottom: 0.75rem;
    line-height: 1.25;
}

.prose h2 { font-size: 1.5rem; font-weight: 600; }
.prose h3 { font-size: 1.2rem; font-weight: 600; }
.prose h4 { font-size: 1rem;   font-weight: 600; }

.prose p {
    margin-bottom: 1.4rem;
    color: var(--fg-muted);
}

.prose a {
    color: var(--fg);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: var(--border-hover);
    transition: text-decoration-color var(--transition-fast);
}

.prose a:hover {
    text-decoration-color: var(--fg-muted);
}

.prose strong {
    color: var(--fg);
    font-weight: 600;
}

.prose em {
    color: var(--fg-muted);
}

.prose ul,
.prose ol {
    padding-left: 1.5rem;
    margin-bottom: 1.4rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.prose ul li::marker { color: var(--fg-dim); }
.prose ol li::marker { color: var(--fg-dim); }

.prose blockquote {
    border-left: 2px solid var(--border-hover);
    padding-left: 1.25rem;
    margin: 1.75rem 0;
    color: var(--fg-dim);
    font-style: italic;
}

.prose blockquote p { color: var(--fg-dim); margin-bottom: 0; }

.prose hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 2.5rem 0;
}

.prose code {
    font-family: 'Geist Mono', 'SF Mono', 'Fira Code', monospace;
    font-size: 0.85em;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.15em 0.4em;
    color: var(--fg);
}

.prose pre {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.25rem 1.5rem;
    overflow-x: auto;
    margin-bottom: 1.4rem;
    line-height: 1.6;
}

.prose pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.875rem;
}

.prose img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    margin: 1.5rem 0;
    display: block;
}

.prose table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.4rem;
    font-size: 0.9rem;
}

.prose th,
.prose td {
    text-align: left;
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border);
}

.prose th {
    color: var(--fg);
    font-weight: 600;
}

/* ==========================================================================
    POST FOOTER — prev/next navigation and contact
 ========================================================================== */
.post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 4rem;
    max-width: 680px;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border);
}

.post-nav-link {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.post-nav-link:hover {
    border-color: var(--border-hover);
    background: var(--surface);
}

.post-nav-link.next { text-align: right; }

.post-nav-label {
    font-size: 0.72rem;
    color: var(--fg-dim);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.post-nav-title {
    font-size: 0.9rem;
    color: var(--fg);
    font-weight: 500;
    line-height: 1.35;
}

.post-contact {
    max-width: 680px;
    margin-top: 3rem;
    padding: 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.post-contact p {
    font-size: 0.9rem;
    color: var(--fg-muted);
    margin: 0;
}

.post-contact a {
    font-size: 0.85rem;
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: 0.45rem 1rem;
    white-space: nowrap;
    flex-shrink: 0;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.post-contact a:hover {
    border-color: var(--border-hover);
    background: var(--surface-hover);
}

/* Loading state while post.js fetches the markdown */
.post-loading {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding-top: 2rem;
    max-width: 680px;
}

.skeleton {
    background: var(--surface);
    border-radius: 4px;
    animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { opacity: 0.4; }
    50%       { opacity: 0.8; }
}

/* Error state */
.post-error {
    padding: 4rem 0;
    color: var(--fg-dim);
    font-size: 0.95rem;
    max-width: 480px;
}

.post-error a {
    color: var(--fg);
    text-decoration: underline;
    text-underline-offset: 3px;
}

@media (max-width: 600px) {
    .post-nav {
        grid-template-columns: 1fr;
    }

    .post-nav-link.next {
        text-align: left;
    }
}

/* ==========================================================================
    REDUCE MOTION
 ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    .reading-progress { transition: none; }
    .skeleton         { animation: none; opacity: 0.5; }
}