.briefs-page-shell {
    --brief-border: rgba(255, 255, 255, 0.095);
    width: min(100%, 900px);
    padding-top: 2rem;
}

.brief-detail-shell {
    width: min(100%, 860px);
}

.briefs-hero {
    padding: 2rem 0 2.5rem;
    border-bottom: 1px solid var(--brief-border);
}

.briefs-hero h1 {
    margin: 0;
    font-size: clamp(2.6rem, 7vw, 4.8rem);
    line-height: 1;
    letter-spacing: -0.05em;
    font-variant-numeric: tabular-nums;
}

.briefs-lead {
    max-width: 42rem;
    margin: 1.2rem 0 0;
    color: rgba(219, 220, 226, 0.86);
    font-size: 1rem;
    line-height: 1.75;
}

.briefs-language-note,
.brief-section-note {
    color: var(--text-secondary-color);
    font-size: 0.88rem;
    line-height: 1.65;
}

.briefs-language-note {
    max-width: 42rem;
    margin: 0.85rem 0 0;
}

.brief-section {
    padding-top: 2.75rem;
}

.brief-section + .brief-section {
    margin-top: 2.75rem;
    border-top: 1px solid var(--brief-border);
}

.briefs-section-heading {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1rem;
}

.briefs-section-heading h2 {
    margin: 0;
    font-size: clamp(1.55rem, 3vw, 2.05rem);
    line-height: 1.2;
    letter-spacing: -0.025em;
}

.brief-count,
.brief-item-meta,
.brief-archive-meta {
    color: var(--text-secondary-color);
    font-size: 0.82rem;
}

.brief-section-note {
    margin: 0.75rem 0 0;
}

.brief-item-list {
    margin-top: 1.15rem;
    border-top: 1px solid var(--brief-border);
}

.brief-item-card {
    padding: 1.55rem 0 1.65rem;
    border-bottom: 1px solid var(--brief-border);
}

.brief-story-title {
    color: var(--text-primary-color);
    font-size: clamp(1.08rem, 2.2vw, 1.3rem);
    font-weight: 700;
    line-height: 1.46;
    text-decoration: none;
    text-underline-offset: 0.18em;
}

.brief-story-title:hover,
.brief-story-title:focus-visible,
.brief-item-meta a:hover,
.brief-item-meta a:focus-visible {
    color: #a6d1ff;
    text-decoration: underline;
    text-decoration-thickness: 1px;
}

.brief-story-title:focus-visible,
.brief-item-meta a:focus-visible,
.brief-archive-row:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
}

.brief-summary,
.brief-why {
    max-width: 46rem;
    line-height: 1.78;
}

.brief-summary {
    margin: 0.9rem 0 0;
    color: rgba(219, 220, 226, 0.94);
    font-size: 0.98rem;
}

.brief-why {
    margin: 0.7rem 0 0;
    color: var(--text-secondary-color);
    font-size: 0.84rem;
}

.brief-why span {
    color: rgba(219, 220, 226, 0.86);
    font-weight: 700;
}

.brief-item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 1.25rem;
    margin: 1rem 0 0;
}

.brief-item-meta a {
    color: #79b8ff;
    text-decoration: none;
}

.brief-archive-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.brief-archive-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 1rem;
    min-height: 72px;
    border-bottom: 1px solid var(--brief-border);
    color: var(--text-primary-color);
    text-decoration: none;
}

.brief-archive-row:hover {
    color: #a6d1ff;
}

.brief-archive-row .brief-date {
    font-size: clamp(1.05rem, 2.2vw, 1.25rem);
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.briefs-empty-state,
.brief-section-empty {
    color: var(--text-secondary-color);
}

.briefs-empty-state {
    padding: 2.5rem 0;
}

.brief-section-empty {
    margin: 1.25rem 0 0;
}

@media (max-width: 640px) {
    .briefs-page-shell,
    .brief-detail-shell {
        padding-top: 0.5rem;
    }

    .briefs-hero {
        padding: 1.5rem 0 1.9rem;
    }

    .brief-section {
        padding-top: 2rem;
    }

    .brief-section + .brief-section {
        margin-top: 2.2rem;
    }

    .briefs-section-heading {
        align-items: flex-start;
    }

    .brief-item-card {
        padding-block: 1.35rem;
    }

    .brief-archive-row {
        grid-template-columns: 1fr;
        gap: 0.25rem;
        padding-block: 0.9rem;
    }

}