/* /blog (blog/index.leaf): a grid of tiles, one per published post.
 *
 * Each tile is the post's 1200x630 cover, then its category, date, reading
 * time, title and excerpt. The title link is the tile's one link: its ::after
 * covers the whole tile, so a click anywhere opens the post while a screen
 * reader hears only the title. The newest post spans the grid at the top.
 *
 * Columns: one below 640px, two from 640px, three from 1024px.
 *
 * The category chips are rendered by the server but start hidden; blog-index.js
 * shows them and hides the tiles that do not match. With no script there is
 * no inert control, and every tile shows. Light theme only, as the page pins
 * data-theme="light".
 */

.blog-index {
    --blog-index-width: 76rem;
    font-family: Inter, system-ui, -apple-system, sans-serif;
}

.blog-index__intro,
.blog-index__posts {
    box-sizing: border-box;
    max-width: var(--blog-index-width);
    margin-inline: auto;
    padding-inline: var(--fk-gutter);
}

.blog-index__intro {
    padding-top: clamp(2.5rem, 1.5rem + 4vw, 5rem);
    padding-bottom: var(--fk-space-xl);
    text-align: center;
}

.blog-index__eyebrow {
    margin: 0 0 var(--fk-space-sm);
    color: var(--fk-primary-text);
    font-size: var(--fk-font-eyebrow);
    font-weight: 700;
    letter-spacing: var(--fk-tracking-eyebrow);
    text-transform: uppercase;
}

.blog-index__title {
    margin: 0;
    color: var(--fk-ink);
    font-size: var(--fk-font-h1);
    font-weight: 800;
    line-height: var(--fk-leading-tight);
    letter-spacing: var(--fk-tracking-tight);
}

.blog-index__lead {
    max-width: 40rem;
    margin: var(--fk-space-md) auto 0;
    color: var(--fk-ink-soft);
    font-size: var(--fk-font-lead);
    line-height: var(--fk-leading-body);
    text-wrap: balance;
}

.blog-index__posts {
    padding-bottom: var(--fk-space-2xl);
}

.blog-index__empty {
    color: var(--fk-text-muted);
    text-align: center;
}

/* ---------- Filter chips ---------- */

.blog-filter {
    margin-bottom: var(--fk-space-xl);
}

.blog-filter__chips {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.4rem;
}

/* On a desktop the chips may use the gutter too, so ten of them fit one row. */
@media (min-width: 1024px) {
    .blog-filter__chips {
        margin-inline: calc(-1 * var(--fk-gutter));
        gap: 0.35rem;
    }
}

/* On a phone the chips are one row that scrolls sideways inside the page
   gutter, rather than four rows of wrapped chips. */
@media (max-width: 639px) {
    .blog-filter__chips {
        flex-wrap: nowrap;
        justify-content: flex-start;
        margin-inline: calc(-1 * var(--fk-gutter));
        padding: 0.25rem var(--fk-gutter);
        overflow-x: auto;
        scroll-padding-inline: var(--fk-gutter);
        scrollbar-width: none;
    }

    .blog-filter__chips::-webkit-scrollbar { display: none; }
    .blog-chip { flex: 0 0 auto; }
}

.blog-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    min-height: 2.5rem;
    padding: 0.4rem 0.7rem;
    border: 1px solid var(--fk-border);
    border-radius: var(--fk-radius-pill);
    background: var(--fk-surface);
    color: var(--fk-ink-soft);
    font-size: 0.8125rem;
    font-weight: 600;
    line-height: 1.2;
    cursor: pointer;
    transition: background-color var(--fk-duration-fast) ease, border-color var(--fk-duration-fast) ease, color var(--fk-duration-fast) ease;
}

.blog-chip:hover {
    border-color: var(--fk-line);
    color: var(--fk-ink);
}

.blog-chip[aria-pressed="true"] {
    border-color: var(--fk-surface-inverse);
    background: var(--fk-surface-inverse);
    color: var(--fk-text-inverse);
}

.blog-chip:focus-visible {
    outline: 2px solid var(--fk-focus);
    outline-offset: 2px;
}

.blog-chip__n {
    color: var(--fk-text-muted);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.blog-chip[aria-pressed="true"] .blog-chip__n {
    color: inherit;
    opacity: 0.75;
}

.blog-chip__dot,
.blog-card__dot {
    flex: 0 0 auto;
    width: 0.6rem;
    height: 0.6rem;
    border-radius: 50%;
    background: linear-gradient(140deg, var(--fk-cat-a), var(--fk-cat-b));
}

.blog-filter__status {
    margin: var(--fk-space-sm) 0 0;
    color: var(--fk-text-muted);
    font-size: var(--fk-font-small);
    text-align: center;
}

.blog-filter__status:empty {
    display: none;
}

/* ---------- Grid ---------- */

.blog-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: var(--fk-space-xl) var(--fk-space-lg);
    margin: 0;
    padding: 0;
    list-style: none;
}

@media (min-width: 640px) {
    .blog-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
    .blog-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- Tile ---------- */

.blog-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: var(--fk-space-md);
    min-width: 0;
    border-radius: var(--fk-radius-lg);
}

.blog-card__media {
    overflow: hidden;
    border-radius: var(--fk-radius-lg);
    background: var(--fk-surface-alt);
    box-shadow: 0 0 0 1px var(--fk-hairline), 0 1px 2px rgba(15, 23, 42, 0.06);
    transition: box-shadow var(--fk-duration-base) var(--fk-ease-out), translate var(--fk-duration-base) var(--fk-ease-out);
}

.blog-card__media img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 1200 / 630;
    object-fit: cover;
}

.blog-card__body {
    display: flex;
    flex-direction: column;
    gap: var(--fk-space-xs);
    min-width: 0;
    padding-inline: 0.125rem;
}

.blog-card__meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem 0.5rem;
    margin: 0;
    color: var(--fk-text-muted);
    font-size: var(--fk-font-small);
}

.blog-card__category {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--fk-ink);
    font-weight: 600;
}

.blog-card__title {
    margin: 0;
    color: var(--fk-ink);
    font-size: 1.25rem;
    font-weight: 700;
    line-height: var(--fk-leading-snug);
    letter-spacing: -0.015em;
    text-wrap: pretty;
}

.blog-card__link {
    color: inherit;
    text-decoration: none;
}

/* The whole tile is the title's link. */
.blog-card__link::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 1;
    border-radius: inherit;
}

.blog-card:has(.blog-card__link:focus-visible) {
    outline: 2px solid var(--fk-focus);
    outline-offset: 6px;
}

.blog-card__link:focus {
    outline: none;
}

.blog-card__excerpt {
    display: -webkit-box;
    margin: 0;
    overflow: hidden;
    color: var(--fk-ink-soft);
    font-size: 0.9375rem;
    line-height: var(--fk-leading-body);
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    line-clamp: 3;
}

.blog-card:hover .blog-card__media {
    translate: 0 -3px;
    box-shadow: 0 0 0 1px var(--fk-hairline), 0 18px 40px -18px rgba(15, 23, 42, 0.35);
}

.blog-card:hover .blog-card__title {
    text-decoration: underline;
    text-decoration-color: var(--fk-primary);
    text-decoration-thickness: 2px;
    text-underline-offset: 0.2em;
}

/* ---------- Featured (newest) tile ---------- */

@media (min-width: 640px) {
    .blog-card--featured {
        grid-column: 1 / -1;
    }
}

@media (min-width: 1024px) {
    .blog-card--featured {
        display: grid;
        grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
        align-items: center;
        gap: var(--fk-space-xl);
        padding-bottom: var(--fk-space-md);
    }

    .blog-card--featured .blog-card__title {
        font-size: var(--fk-font-h3);
        letter-spacing: -0.025em;
    }

    .blog-card--featured .blog-card__excerpt {
        font-size: 1.0625rem;
        -webkit-line-clamp: 5;
        line-clamp: 5;
    }
}

/* While a filter is on, the featured tile is an ordinary tile. */
.blog-grid.is-filtered .blog-card--featured {
    display: flex;
    grid-column: auto;
    gap: var(--fk-space-md);
    padding-bottom: 0;
}

.blog-grid.is-filtered .blog-card--featured .blog-card__title {
    font-size: 1.25rem;
}

@media (prefers-reduced-motion: reduce) {
    .blog-chip,
    .blog-card__media {
        transition: none;
    }

    .blog-card:hover .blog-card__media {
        translate: none;
    }
}