/* Desktop operational/discovery surface. Filter/list primitives live in
 * browse.css; this file owns only page composition, Topic rail, and sidebar. */

.dn-operational-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 56px;
    padding: 34px 0 64px;
}

.dn-operational-main {
    min-width: 0;
}

.dn-operational-heading {
    margin: 0 0 24px;
}

.dn-operational-heading__eyebrow {
    margin: 0 0 8px;
    color: var(--dn-accent-primary);
    font-family: var(--dn-font-mono);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
}

/* Prompt 1492: the page-level H1 treatment is not owned here -- it is the shared
 * `.dn-page-heading h1` primitive in common.css (also used by the Topic page), so
 * this surface's title is consistent with the other desktop publication surfaces
 * instead of a second, independently-tuned heading rule. This file keeps only the
 * heading block's own margin/eyebrow/subtitle layout. */

.dn-operational-heading > p:last-child {
    max-width: 660px;
    margin: 12px 0 0;
    color: var(--dn-text-secondary);
    font-family: var(--dn-font-serif);
    font-size: 17px;
    line-height: 1.4;
}

.dn-operational-topics {
    margin: 26px 0 30px;
    padding: 20px 0;
    border-top: 1px solid var(--dn-rule-subtle);
    border-bottom: 1px solid var(--dn-rule-subtle);
}

.dn-operational-topics__heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 14px;
}

.dn-operational-topics__heading h2 {
    margin: 0;
    color: var(--dn-text-primary);
    font-family: var(--dn-font-mono);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.dn-operational-topics__more {
    border: 0;
    padding: 4px 0;
    color: var(--dn-text-secondary);
    background: transparent;
    font-family: var(--dn-font-body);
    font-size: 13px;
    cursor: pointer;
}

.dn-operational-topics__more:hover {
    color: var(--dn-accent-primary);
}

.dn-operational-topics__track {
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
}

.dn-operational-topics__track:focus-visible {
    outline: 2px solid var(--dn-accent-primary);
    outline-offset: 4px;
}

.dn-operational-topics__list {
    display: flex;
    gap: 12px;
    width: max-content;
    min-width: 100%;
    margin: 0;
    padding: 0 0 8px;
    list-style: none;
}

.dn-operational-topics__item {
    flex: 0 0 276px;
    border: 1px solid var(--dn-rule-subtle);
    border-radius: var(--radius-md, 8px);
    background: var(--dn-surface-panel);
}

.dn-operational-topics .dn-topic-card__visual {
    width: 56px;
    height: 56px;
}

.dn-operational-sidebar {
    border-left: 1px solid var(--dn-rule-subtle);
    padding-left: 28px;
}

.dn-operational-sidebar__section {
    margin-top: 22px;
    padding: 18px;
    border: 1px solid var(--dn-rule-subtle);
    border-radius: var(--radius-md, 8px);
}

.dn-operational-sidebar__section h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 12px;
    color: var(--dn-text-primary);
    font-family: var(--dn-font-body);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.dn-operational-sidebar__section p {
    margin: 0;
    color: var(--dn-text-secondary);
    font-family: var(--dn-font-serif);
    font-size: 15px;
    line-height: 1.45;
}

@media (max-width: 900px) {
    .dn-operational-layout {
        grid-template-columns: 1fr;
        padding: 20px 16px 40px;
        gap: 32px;
    }

    .dn-operational-sidebar {
        border-left: 0;
        border-top: 1px solid var(--dn-rule-subtle);
        padding: 24px 0 0;
    }
}