/* =========================================================
   BLOG POST STYLES
   Self-contained (System A tokens only). Own copy of the
   card/reveal styles for the "More posts" section — page CSS
   files here are self-contained by convention (about.css,
   tools.css, blog.css each keep their own).
========================================================= */

/* =========================================================
   READING PROGRESS BAR
========================================================= */
.blog-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    z-index: 150;
    pointer-events: none;
}

.blog-progress-bar {
    display: block;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

/* =========================================================
   SHARE ROW (rendered into the hero's `after` slot)
========================================================= */
.blog-share {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

.blog-share #blog-copy-link.is-copied {
    color: var(--success);
    border-color: var(--success);
}

/* =========================================================
   COVER IMAGE / PLACEHOLDER
   Reuses the same two-radial gradient mix as page-hero.css when the
   post has no `image`, so an unillustrated post still looks deliberate.
========================================================= */
.blog-post-cover {
    position: relative;
    max-width: 900px;
    aspect-ratio: 21 / 9;
    margin: var(--space-10) auto 0;
    border-radius: 20px;
    overflow: hidden;
    background:
        radial-gradient(ellipse 80% 100% at 0% 0%, var(--color-primary-soft) 0%, transparent 65%),
        radial-gradient(ellipse 80% 100% at 100% 100%, color-mix(in srgb, var(--color-secondary) 16%, transparent) 0%, transparent 65%),
        var(--surface-secondary);
}

.blog-post-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-post-cover-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: var(--color-primary);
    opacity: 0.35;
    font-size: 2.5rem;
}

/* =========================================================
   PROSE
========================================================= */
.blog-post-body {
    padding: var(--space-16) var(--space-8) var(--space-8);
}

.blog-post-prose {
    max-width: 700px;
    margin: 0 auto;
}

.blog-post-prose > * + * {
    margin-top: var(--space-5);
}

.blog-post-prose h2,
.blog-post-prose h3,
.blog-post-prose h4 {
    margin-top: var(--space-10);
    color: var(--text-primary);
}

.blog-post-prose h2 { font-size: var(--text-3xl); }
.blog-post-prose h3 { font-size: var(--text-2xl); }
.blog-post-prose h4 { font-size: var(--text-xl); }

.blog-post-prose p {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

.blog-post-prose ul,
.blog-post-prose ol {
    list-style: revert;
    padding-left: var(--space-6);
}

.blog-post-prose li {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

.blog-post-prose li + li {
    margin-top: var(--space-2);
}

.blog-post-prose a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.blog-post-prose blockquote {
    border-left: 3px solid var(--color-primary);
    padding-left: var(--space-5);
    color: var(--text-secondary);
    font-style: italic;
}

.blog-post-prose code {
    background: var(--surface-secondary);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    font-size: 0.9em;
}

.blog-post-prose img {
    border-radius: 14px;
    margin-top: var(--space-6);
}

/* =========================================================
   PREV / NEXT POST NAV
========================================================= */
.blog-post-nav {
    max-width: 700px;
    margin: var(--space-12) auto 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.blog-post-nav-link {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-5);
    border: 1px solid var(--border-primary);
    border-radius: 14px;
    background: var(--surface-primary);
    text-decoration: none;
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.blog-post-nav-link:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.blog-post-nav-older {
    grid-column: 2;
    text-align: right;
    align-items: flex-end;
}

.blog-post-nav-label {
    font-size: var(--text-xs);
    font-weight: var(--font-semi-bold);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-primary);
}

.blog-post-nav-title {
    font-size: var(--text-base);
    font-weight: var(--font-semi-bold);
    color: var(--text-primary);
}

/* =========================================================
   BACK LINK
========================================================= */
.blog-post-back {
    max-width: 700px;
    margin: var(--space-10) auto var(--space-20);
    padding: 0 var(--space-8);
}

.blog-post-back a {
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: var(--font-semi-bold);
    transition: color var(--transition-fast);
}

.blog-post-back a:hover {
    color: var(--color-primary);
}

/* =========================================================
   RELATED POSTS (own copy of the listing's card + reveal)
========================================================= */
.reveal {
    animation: blog-post-reveal 0.7s cubic-bezier(0.16, 1, 0.3, 1) backwards;
    animation-delay: calc(var(--d, 0) * 80ms);
}

@keyframes blog-post-reveal {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.blog-related {
    padding: var(--space-16) var(--space-8) var(--space-8);
    border-top: 1px solid var(--border-primary);
}

.blog-wrap {
    max-width: 1140px;
    margin: 0 auto;
}

.blog-related-title {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-6);
}

.blog-meta-sep {
    color: var(--text-disabled);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--space-6);
}

.blog-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--surface-primary);
    border: 1px solid var(--border-primary);
    border-radius: 18px;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    color: inherit;
    overflow: hidden;
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
        border-color 0.3s ease,
        box-shadow 0.4s ease;
}

.blog-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 0%, var(--color-primary-soft), transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

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

.blog-card:hover::before {
    opacity: 1;
}

.blog-card-image {
    position: relative;
    aspect-ratio: 16 / 9;
    background:
        radial-gradient(ellipse 80% 100% at 0% 0%, var(--color-primary-soft) 0%, transparent 65%),
        radial-gradient(ellipse 80% 100% at 100% 100%, color-mix(in srgb, var(--color-secondary) 16%, transparent) 0%, transparent 65%),
        var(--surface-secondary);
}

.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.blog-card-image-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: var(--color-primary);
    opacity: 0.35;
}

.blog-card-body {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-6) var(--space-8) var(--space-8);
    flex: 1;
}

.blog-card-tag {
    font-size: var(--text-xs);
    font-weight: var(--font-semi-bold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
}

.blog-card-title {
    font-size: var(--text-xl);
    line-height: var(--leading-tight);
    color: var(--text-primary);
}

.blog-card-excerpt {
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
    color: var(--text-muted);
    flex: 1;
}

.blog-card-meta {
    font-size: var(--text-xs);
    color: var(--text-muted);
    margin-top: var(--space-1);
}

/* =========================================================
   RESPONSIVE
========================================================= */
@media (max-width: 768px) {
    .blog-post-cover {
        aspect-ratio: 16 / 9;
        margin-top: var(--space-6);
    }

    .blog-post-body {
        padding: var(--space-10) var(--space-5) var(--space-4);
    }

    .blog-related {
        padding: var(--space-12) var(--space-5) var(--space-4);
    }

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

    .blog-post-nav {
        grid-template-columns: 1fr;
    }

    .blog-post-nav-older {
        grid-column: 1;
        text-align: left;
        align-items: flex-start;
    }
}

/* =========================================================
   REDUCED MOTION
========================================================= */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        animation: none;
    }

    .blog-card,
    .blog-card::before {
        transition: none;
    }

    .blog-card:hover {
        transform: none;
    }

    .blog-progress-bar {
        transition: none;
    }
}