/* ---------------------------------------------------------------------------
   TrackMe blog — layered on style.css, reusing its tokens rather than
   redefining them. Nothing here overrides a landing-page class; every selector
   is scoped to .blog-* or .article so the two can evolve independently.
   --------------------------------------------------------------------------- */

.blog-page {
    /* Local aliases so diagram SVGs can be authored once and read on this ground.
       `--sealed` is the encoding used throughout the first post: cyan means the
       relay cannot read it. */
    --sealed: var(--cyan);
    --plain: var(--muted);
    --rule: rgba(148, 163, 184, .20);
    --soft: rgba(41, 182, 246, .09);
    --measure: 70ch;
}

/* ---- reading progress ---------------------------------------------------- */

.read-progress {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 30;
    height: 2px;
    width: 100%;
    transform: scaleX(0);
    transform-origin: 0 50%;
    background: linear-gradient(90deg, var(--cyan-deep), var(--cyan));
    will-change: transform;
}

/* ---- hero ---------------------------------------------------------------- */

.blog-hero {
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid rgba(41, 182, 246, .16);
    background:
        radial-gradient(900px 420px at 12% -10%, rgba(41, 182, 246, .13), transparent 62%),
        var(--night);
}

.blog-hero::after {
    /* A faint route line — the product's own mark, not a generic tech texture. */
    content: "";
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 320' preserveAspectRatio='none'><path d='M-20 268 C 160 236, 250 96, 420 104 S 720 168, 880 96 S 1120 34, 1220 22' fill='none' stroke='%2329B6F6' stroke-opacity='0.14' stroke-width='2.5' stroke-linecap='round'/></svg>");
    background-repeat: no-repeat;
    background-size: 100% 100%;
    pointer-events: none;
}

.blog-hero-inner {
    position: relative;
    z-index: 1;
    padding: 72px 0 60px;
    max-width: 62ch;
}

.blog-hero h1 {
    margin: 0 0 16px;
    font-size: clamp(2.1rem, 5.2vw, 3.3rem);
    line-height: 1.04;
    letter-spacing: -.025em;
    font-weight: 800;
    text-wrap: balance;
}

.blog-hero p {
    margin: 0;
    color: var(--muted-strong);
    font-size: 1.08rem;
    line-height: 1.62;
}

/* ---- listing ------------------------------------------------------------- */

.post-list {
    padding: 56px 0 96px;
    display: grid;
    gap: 26px;
}

.post-grid {
    display: grid;
    gap: 26px;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.post-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--night-soft);
    border: 1px solid rgba(148, 163, 184, .16);
    border-radius: var(--radius);
    overflow: hidden;
    text-decoration: none;
    transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.post-card::before {
    /* Hairline that lights up on hover — the only motion on the card. */
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    opacity: 0;
    transition: opacity .2s var(--ease);
}

.post-card:hover,
.post-card:focus-visible {
    transform: translateY(-3px);
    border-color: rgba(41, 182, 246, .42);
    box-shadow: var(--shadow-2);
}

.post-card:hover::before,
.post-card:focus-visible::before { opacity: 1; }

.post-cover {
    display: block;
    width: 100%;
    /* The markup keeps width/height attributes so the browser reserves space before the image
       loads. Those attributes are presentational hints that outrank `aspect-ratio`, so height
       must be released here or every cover renders 630px tall regardless of its column. */
    height: auto;
    aspect-ratio: 1200 / 630;
    /* `contain`, not `cover`. These covers are diagrams — cropping one does not lose
       decoration, it loses the meaning. The first post's cover put its key and its label
       on the left, exactly where a centre crop cuts. */
    object-fit: contain;
    background: var(--night);
    border-bottom: 1px solid rgba(148, 163, 184, .12);
}

.post-card-body {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 20px 22px 24px;
    flex: 1;
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    font-size: .72rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--muted);
}

.post-meta time { font-variant-numeric: tabular-nums; }
.post-meta .dot { opacity: .5; }

.tag {
    padding: 3px 9px;
    border-radius: 100px;
    background: rgba(41, 182, 246, .13);
    color: var(--cyan);
    letter-spacing: .08em;
}

.post-card h2,
.post-card h3 {
    margin: 0;
    font-family: "Space Grotesk", Inter, sans-serif;
    font-size: 1.22rem;
    line-height: 1.24;
    letter-spacing: -.015em;
    font-weight: 700;
    color: var(--ink);
    text-wrap: balance;
}

.post-excerpt {
    margin: 0;
    color: var(--muted-strong);
    font-size: .93rem;
    line-height: 1.58;
}

.post-more {
    margin-top: auto;
    padding-top: 6px;
    color: var(--cyan);
    font-weight: 700;
    font-size: .88rem;
}

.post-more::after {
    content: " →";
    display: inline-block;
    transition: transform .2s var(--ease);
}

.post-card:hover .post-more::after { transform: translateX(3px); }

/* Featured — the newest post gets the wide treatment. */
@media (min-width: 860px) {
    .post-card--featured {
        grid-column: 1 / -1;
        flex-direction: row;
        align-items: stretch;
    }

    .post-card--featured .post-cover {
        /* Keeps its natural ratio and centres in the row, so the card's height comes from the
           text rather than from a stretched image. Stretching produced a 632px-tall card. */
        width: 52%;
        align-self: center;
        border-bottom: 0;
        padding: 16px;
    }

    .post-card--featured .post-card-body {
        justify-content: center;
        padding: 34px 38px;
        gap: 13px;
        border-left: 1px solid rgba(148, 163, 184, .12);
    }

    .post-card--featured h2 { font-size: 1.85rem; }
    .post-card--featured .post-excerpt { font-size: 1rem; }
}

/* ---- empty / upcoming ---------------------------------------------------- */

.post-upcoming {
    border: 1px dashed rgba(148, 163, 184, .26);
    border-radius: var(--radius);
    padding: 26px 24px;
    color: var(--muted);
    font-size: .93rem;
    text-align: center;
}

/* ---- article ------------------------------------------------------------- */

.article-head {
    border-bottom: 1px solid rgba(148, 163, 184, .16);
    padding: 48px 0 38px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: var(--muted);
    text-decoration: none;
    font-size: .86rem;
    font-weight: 700;
    margin-bottom: 22px;
}

.back-link:hover, .back-link:focus-visible { color: var(--cyan); }

.article-head h1 {
    margin: 14px 0 16px;
    max-width: 22ch;
    font-size: clamp(2rem, 5vw, 3.1rem);
    line-height: 1.05;
    letter-spacing: -.026em;
    font-weight: 800;
    text-wrap: balance;
}

.article-standfirst {
    margin: 0;
    max-width: 58ch;
    color: var(--muted-strong);
    font-size: 1.1rem;
    line-height: 1.62;
}

.article-cover {
    display: block;
    width: 100%;
    /* Same reason as .post-cover: the height attribute is a presentational hint, and without
       this the cover renders 630px tall at every width. */
    height: auto;
    aspect-ratio: 1200 / 630;
    margin: 34px 0 0;
    border: 1px solid rgba(148, 163, 184, .16);
    border-radius: var(--radius);
}

/* Centre column with full-bleed escapes for figures and tables. */
.article {
    display: grid;
    grid-template-columns: 1fr min(var(--measure), 100%) 1fr;
    padding: 44px 0 88px;
    color: var(--muted-strong);
    font-size: 1.02rem;
    line-height: 1.72;
}

.article > * { grid-column: 2; }
.article > .bleed { grid-column: 1 / -1; }

.article > * + * { margin-top: 22px; }

.article h2 {
    margin-top: 52px;
    font-size: clamp(1.4rem, 3vw, 1.85rem);
    line-height: 1.16;
    letter-spacing: -.02em;
    font-weight: 700;
    color: var(--ink);
    text-wrap: balance;
}

.article h3 {
    margin-top: 34px;
    font-family: "Space Grotesk", Inter, sans-serif;
    font-size: 1.1rem;
    line-height: 1.3;
    font-weight: 700;
    color: var(--ink);
}

.article .kicker {
    margin-top: 52px;
    margin-bottom: -12px;
    color: var(--cyan);
    text-transform: uppercase;
    letter-spacing: .14em;
    font-size: .7rem;
    font-weight: 800;
}

.article strong { color: var(--ink); font-weight: 650; }

.article code {
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: .87em;
    background: var(--soft);
    color: var(--cyan);
    padding: .12em .4em;
    border-radius: 4px;
    white-space: nowrap;
}

.article a:not(.btn) {
    color: var(--cyan);
    text-underline-offset: 3px;
}

.article ul { padding-left: 20px; }
.article li + li { margin-top: 8px; }
.article li::marker { color: var(--cyan); }

/* ---- figures ------------------------------------------------------------- */

.article figure {
    margin: 34px 0 0;
    padding: 24px;
    background: var(--night-soft);
    border: 1px solid rgba(148, 163, 184, .16);
    border-radius: var(--radius);
    overflow-x: auto;
}

.article figure svg {
    display: block;
    max-width: 100%;
    height: auto;
    margin-inline: auto;
    color: var(--ink);
}

.article figcaption {
    margin-top: 18px;
    max-width: 76ch;
    font-size: .87rem;
    line-height: 1.6;
    color: var(--muted);
}

.article figcaption b { color: var(--muted-strong); font-weight: 650; }

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 22px;
    margin-top: 16px;
    padding: 12px 14px;
    background: var(--soft);
    border-radius: var(--radius-sm);
}

.legend span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: .8rem;
    color: var(--muted);
}

.swatch { width: 13px; height: 13px; border-radius: 3px; flex: 0 0 auto; }

/* ---- callouts ------------------------------------------------------------ */

.callout {
    margin-top: 26px;
    padding: 16px 20px;
    border-left: 3px solid var(--cyan);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: var(--soft);
    font-size: .95rem;
}

.callout--warn {
    border-left-color: var(--amber);
    background: rgba(245, 158, 11, .07);
}

.callout p { margin: 0; }

/* ---- tables -------------------------------------------------------------- */

.table-wrap {
    margin-top: 30px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.article table {
    width: 100%;
    border-collapse: collapse;
    font-size: .88rem;
    min-width: 620px;
}

.article th {
    text-align: left;
    padding: 0 14px 10px 0;
    border-bottom: 1px solid rgba(148, 163, 184, .24);
    font-size: .66rem;
    letter-spacing: .13em;
    text-transform: uppercase;
    font-weight: 800;
    color: var(--muted);
    white-space: nowrap;
}

.article td {
    padding: 12px 14px 12px 0;
    border-bottom: 1px solid rgba(148, 163, 184, .12);
    vertical-align: top;
    color: var(--muted-strong);
}

.article td:first-child { white-space: nowrap; }
.article tbody tr:hover { background: rgba(41, 182, 246, .05); }
.article .num { font-variant-numeric: tabular-nums; }

.pill {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 100px;
    font-size: .66rem;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
    white-space: nowrap;
}

.pill-auth { background: rgba(41, 182, 246, .14); color: var(--cyan); }
.pill-open { background: rgba(245, 158, 11, .15); color: var(--amber); }

/* ---- article footer ------------------------------------------------------ */

.article-end {
    margin-top: 62px;
    padding-top: 30px;
    border-top: 1px solid rgba(148, 163, 184, .16);
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
    justify-content: space-between;
}

.article-end p { margin: 0; color: var(--muted); font-size: .92rem; }

@media (max-width: 720px) {
    .blog-hero-inner { padding: 52px 0 44px; }
    .post-list { padding: 40px 0 72px; }
    .article { padding: 32px 0 64px; font-size: 1rem; }
    .article figure { padding: 14px; }
    .article-head { padding: 32px 0 28px; }

    /* The diagrams are authored ~900 units wide with 10.5px labels. Letting them shrink to a
       345px column renders that text at roughly 4px — not small, illegible. Hold a floor and
       let the figure scroll instead, the same way the tables already do. */
    .article figure svg { min-width: 600px; }

    .article figure::before {
        content: "Scroll to see the whole diagram →";
        display: block;
        margin-bottom: 10px;
        font-size: .72rem;
        letter-spacing: .06em;
        text-transform: uppercase;
        font-weight: 700;
        color: var(--muted);
        position: sticky;
        left: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .post-card, .post-card::before, .post-more::after, .read-progress { transition: none; }
    .post-card:hover { transform: none; }
}