.series-navigation {
    margin-top: 58px;
    padding: clamp(24px, 4vw, 46px);
    border: 1px solid var(--line, rgba(163, 190, 185, .16));
    border-radius: 20px;
    background: linear-gradient(130deg, rgba(25, 48, 48, .84), rgba(11, 25, 30, .94) 62%);
    color: var(--paper, var(--ink, #ecf2ef));
    box-shadow: 0 22px 62px rgba(0, 0, 0, .18);
}

.series-navigation__intro {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 28px;
    padding-bottom: 25px;
    border-bottom: 1px solid var(--line, rgba(163, 190, 185, .16));
}

.series-navigation__kicker {
    color: var(--gold-soft, #f0c97b);
    font: 700 10px/1.4 ui-monospace, SFMono-Regular, Menlo, monospace;
    letter-spacing: .17em;
}

.series-navigation h2,
.series-navigation h3,
.series-navigation p { margin: 0; }

.series-navigation h2 {
    margin-top: 8px;
    font-family: "Songti SC", STSong, "Noto Serif SC", serif;
    font-size: clamp(25px, 3vw, 38px);
    line-height: 1.2;
    letter-spacing: -.03em;
}

.series-navigation__intro p {
    max-width: 28em;
    color: #a9bcb4;
    font-size: 12px;
    line-height: 1.7;
}

.series-navigation__grid {
    display: grid;
    grid-template-columns: 1fr 1.25fr .78fr;
    gap: clamp(22px, 3vw, 42px);
    padding-top: 26px;
}

.series-navigation__group h3 {
    margin-bottom: 10px;
    color: var(--gold-soft, #f0c97b);
    font-size: 11px;
    font-weight: 650;
    letter-spacing: .08em;
}

.series-navigation__group a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 40px;
    padding: 9px 0;
    border-bottom: 1px solid rgba(163, 190, 185, .12);
    color: #d6e3db;
    font-size: 13px;
    line-height: 1.4;
    text-decoration: none;
    transition: color .18s, padding .18s;
}

.series-navigation__group a span { color: #8ca89b; font-size: 15px; }
.series-navigation__group a:hover { color: var(--gold-soft, #f0c97b); padding-left: 4px; }
.series-navigation__group a:hover span { color: currentColor; }
.series-navigation__group a:focus-visible { outline: 2px solid var(--gold-soft, #f0c97b); outline-offset: 3px; }
.series-navigation__group a[aria-current="page"] { color: var(--gold-soft, #f0c97b); font-weight: 700; }
.series-navigation__group a[aria-current="page"] span { color: currentColor; }

.site-header .header-nav { flex-wrap: wrap; justify-content: flex-end; }
.site-header .header-nav a { display: inline-flex; align-items: center; min-height: 40px; padding: 9px 14px; }
.site-header .header-nav a:last-child { border-color: var(--line-strong, rgba(213, 169, 91, .42)); color: var(--gold-soft, #f0c97b); }

.section-jump-nav { display: flex; align-items: center; flex-wrap: wrap; gap: 9px; margin: 0 0 24px; }
.section-jump-nav > span { margin-right: 8px; color: var(--ink-muted, #8e9d9d); font-size: 11px; }
.section-jump-nav a { display: inline-flex; align-items: center; gap: 12px; min-height: 38px; padding: 7px 12px; border: 1px solid var(--line, rgba(163, 190, 185, .16)); border-radius: 8px; color: var(--ink, #ecf2ef); font-size: 11px; text-decoration: none; }
.section-jump-nav a:hover { border-color: var(--line-strong, rgba(213, 169, 91, .42)); color: var(--gold-soft, #f0c97b); }
.section-jump-nav a:focus-visible { outline: 2px solid var(--gold-soft, #f0c97b); outline-offset: 3px; }

@media (max-width: 900px) {
    .series-navigation__grid { grid-template-columns: 1fr 1fr; }
    .series-navigation__group:last-child { grid-column: 1 / -1; }
}

@media (max-width: 650px) {
    .site-header { align-items: center; flex-wrap: wrap; gap: 10px; }
    .site-header .header-nav { display: flex; justify-content: flex-start; width: 100%; }
    .site-header .header-nav a { min-height: 38px; padding: 8px 12px; font-size: 12px; }
    .series-navigation { margin-top: 38px; padding: 22px 18px; }
    .series-navigation__intro { align-items: start; flex-direction: column; gap: 12px; }
    .series-navigation__grid { grid-template-columns: 1fr; gap: 23px; }
    .series-navigation__group:last-child { grid-column: auto; }
}

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