:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1016; --paper: #111821; --paper-soft: #161f29; --ink: #e8eef4;
  --muted: #9ba9b7; --faint: #697a8b; --accent: #79add8; --accent-soft: rgba(121, 173, 216, .13);
  --line: rgba(210, 226, 239, .09); --line-strong: rgba(210, 226, 239, .15);
  --fresh-paper: rgba(17, 24, 33, .96); --fresh-line: rgba(210, 226, 239, .09); --fresh-ink: #e8eef4; --fresh-muted: #9ba9b7;
}
:root[data-theme="dark"] body { background: radial-gradient(circle at 18% 0%, rgba(60, 93, 122, .18), transparent 34%), #0b1016 !important; }
:root[data-theme="dark"] .hero-cover { background: linear-gradient(135deg, #172838, #121c26 58%, #151b23) !important; }
:root[data-theme="dark"] .rail,
:root[data-theme="dark"] .mobile-top,
:root[data-theme="dark"] .hero,
:root[data-theme="dark"] .index-section,
:root[data-theme="dark"] .quick-search,
:root[data-theme="dark"] .aside-panel { background: rgba(15, 22, 30, .94) !important; border-color: var(--line) !important; }
:root[data-theme="dark"] .article-row,
:root[data-theme="dark"] .sidebar-item,
:root[data-theme="dark"] .topic-item,
:root[data-theme="dark"] .archive-item { background: #141c25 !important; border-color: var(--line) !important; color: var(--ink) !important; }
:root[data-theme="dark"] input,
:root[data-theme="dark"] textarea { background: #0e151d !important; border-color: var(--line-strong) !important; color: var(--ink) !important; }
:root[data-theme="dark"] .rail-mark,
:root[data-theme="dark"] .avatar-mark { background: linear-gradient(135deg, #294862, #1c2d3d) !important; color: #dceaf5 !important; }