/* =========================================================
   BLOG LISTING STYLES
   Self-contained. Built only on the website design system
   (System A) tokens — same card/hover language as tools.css,
   own copy of the staggered reveal (page CSS files here are
   self-contained by convention; see about.css/tools.css).
========================================================= */

/* =========================================================
   ENTRANCE ANIMATION (CSS-only, staggered via --d)
========================================================= */
.reveal {
    animation: blog-reveal 0.7s cubic-bezier(0.16, 1, 0.3, 1) backwards;
    animation-delay: calc(var(--d, 0) * 80ms);
}

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

/* =========================================================
   LAYOUT
========================================================= */
.blog-body {
    padding: var(--space-16) var(--space-8) var(--space-32);
}

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

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

/* =========================================================
   TOOLBAR (tag filters + RSS link)
========================================================= */
.blog-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
}

.blog-filters {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.blog-rss-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: var(--font-semi-bold);
    transition: color var(--transition-fast);
}

.blog-rss-link:hover {
    color: var(--color-primary);
}

.blog-filter {
    display: inline-flex;
    align-items: center;
    padding: var(--space-2) var(--space-4);
    border: 1px solid var(--border-primary);
    border-radius: 999px;
    background: var(--surface-primary);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-semi-bold);
    text-decoration: none;
    transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}

.blog-filter:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.blog-filter.is-active {
    background: var(--color-primary-soft);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* =========================================================
   EMPTY STATE
========================================================= */
.blog-empty {
    padding: var(--space-16) 0;
    text-align: center;
    color: var(--text-muted);
    font-size: var(--text-lg);
}

/* =========================================================
   COVER IMAGE / PLACEHOLDER (shared shape — featured, card)
   A post with no `image` gets a branded gradient + icon instead of a
   blank box, so every card keeps the same rhythm either way. The
   gradient reuses the exact two-radial mix from page-hero.css.
========================================================= */
.blog-featured-image,
.blog-card-image {
    position: relative;
    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-featured-image img,
.blog-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

/* =========================================================
   FEATURED POST
========================================================= */
.blog-featured {
    position: relative;
    display: flex;
    flex-direction: column;
    margin-bottom: var(--space-10);
    background: var(--surface-primary);
    border: 1px solid var(--border-primary);
    border-radius: 24px;
    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-featured:hover {
    transform: translateY(-4px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
}

.blog-featured-image {
    aspect-ratio: 21 / 9;
}

.blog-featured-image-placeholder {
    font-size: 2rem;
}

.blog-featured-body {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    padding: var(--space-10);
}

.blog-featured-tag {
    display: inline-block;
    width: fit-content;
    font-size: var(--text-xs);
    font-weight: var(--font-semi-bold);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
}

.blog-featured-title {
    font-size: var(--text-4xl);
    line-height: var(--leading-tight);
    color: var(--text-primary);
    max-width: 24ch;
}

.blog-featured-excerpt {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
    max-width: 60ch;
}

.blog-featured-meta {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-top: var(--space-2);
}

/* =========================================================
   GRID + CARD
========================================================= */
.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:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.blog-card-image {
    aspect-ratio: 16 / 9;
}

.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-body {
        padding: var(--space-12) var(--space-5) var(--space-24);
    }

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

    .blog-featured-image {
        aspect-ratio: 16 / 9;
    }

    .blog-featured-body {
        padding: var(--space-6);
    }

    .blog-featured-title {
        font-size: var(--text-3xl);
    }
}

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

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

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