/* ============================================================================
   BLOG — topic menu (left) + accordion Q&A panels (right)
   Builds on the same split layout language as the case pages.
   ============================================================================ */

.blog {
    padding-block: 0 var(--space-20);
}

.blog__inner {
    display: grid;
    gap: var(--space-8);
    align-items: start;
}

@media (min-width: 900px) {
    .blog__inner {
        grid-template-columns: minmax(0, 17rem) minmax(0, 1fr);
        gap: var(--space-12);
    }

    /* Topic list follows the reader down the page */
    .blog__nav {
        position: sticky;
        top: calc(var(--header-h) + var(--space-6));
    }
}

/* ---------------------------------- Topic menu ------------------------------ */
.blog__nav-title {
    font-size: var(--fs-caption);
    font-weight: var(--fw-semibold);
    letter-spacing: var(--ls-wider);
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-4);
}

.blog__topics {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.blog__topic {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    width: 100%;
    min-height: 44px; /* touch target */
    padding: var(--space-3) var(--space-4);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--fs-body);
    font-weight: var(--fw-medium);
    text-align: left;
    color: var(--color-text-secondary);
    transition: background var(--dur-base) var(--ease-standard), color var(--dur-base) var(--ease-standard), border-color var(--dur-base) var(--ease-standard);
}

.blog__topic:hover {
    background: var(--color-bg-alt);
    color: var(--color-text-strong);
}

.blog__topic[aria-selected="true"] {
    background: var(--color-primary-subtle);
    border-color: var(--color-primary);
    color: var(--color-primary);
    font-weight: var(--fw-semibold);
}

.blog__topic svg {
    flex: none;
    width: 20px;
    height: 20px;
}

/* Horizontal scroller on narrow screens so topics do not eat the fold */
@media (max-width: 899px) {
    .blog__topics {
        flex-direction: row;
        flex-wrap: nowrap;
        overflow-x: auto;
        gap: var(--space-2);
        padding-bottom: var(--space-2);
        scrollbar-width: thin;
        -webkit-overflow-scrolling: touch;
    }

    .blog__topic {
        flex: none;
        width: auto;
        white-space: nowrap;
        border-color: var(--color-border);
    }
}

/* ---------------------------------- Panels ---------------------------------- */
.blog__panel[hidden] {
    display: none;
}

.blog__panel-head {
    margin-bottom: var(--space-6);
}

.blog__panel-head h2 {
    font-size: var(--fs-h3);
    margin-bottom: var(--space-2);
}

.blog__panel-head p {
    color: var(--color-text-secondary);
}

/* ---------------------------------- Accordion ------------------------------- */
.accordion {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.accordion__item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--dur-base), box-shadow var(--dur-base);
}

.accordion__item[open] {
    border-color: var(--color-border-strong);
    box-shadow: var(--shadow-sm);
}

.accordion__item > summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    min-height: 44px;
    padding: var(--space-4) var(--space-5);
    cursor: pointer;
    list-style: none;
    font-family: var(--font-heading);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-h5);
    line-height: var(--lh-snug);
    color: var(--color-text-strong);
    transition: color var(--dur-base);
}

/* hide the native disclosure marker in every engine */
.accordion__item > summary::-webkit-details-marker { display: none; }
.accordion__item > summary::marker { content: ""; }

.accordion__item > summary:hover {
    color: var(--color-primary);
}

/* chevron */
.accordion__icon {
    flex: none;
    width: 22px;
    height: 22px;
    color: var(--color-primary);
    transition: transform var(--dur-base) var(--ease-out);
}

.accordion__item[open] .accordion__icon {
    transform: rotate(180deg);
}

.accordion__body {
    padding: 0 var(--space-5) var(--space-5);
}

.accordion__body p {
    color: var(--color-text-secondary);
}

.accordion__body p + p {
    margin-top: var(--space-3);
}

.accordion__body ul {
    margin-top: var(--space-3);
    padding-left: 1.25rem;
    list-style: disc;
}

.accordion__body li {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

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

@media (prefers-reduced-motion: reduce) {
    .accordion__icon {
        transition: none;
    }
}