:root{--font-display:"Instrument Serif","Times New Roman",serif;--font-ui:"Inter Tight",system-ui,-apple-system,sans-serif;--s-1:4px;--s-2:8px;--s-3:12px;--s-4:16px;--s-5:20px;--s-6:24px;--r-sm:6px;--r-pill:999px;--ease:cubic-bezier(0.2,0,0,1);--bg-0:#0a0a0f;--bg-1:#0f1017;--bg-2:#14151e;--bg-3:#1a1c27;--fg-0:#f4f5f8;--fg-1:#c2c5cf;--fg-2:#8a8d99;--line-1:rgba(255,255,255,0.04);--line-2:rgba(255,255,255,0.08);--line-3:rgba(255,255,255,0.14);--glass:rgba(15,16,23,0.72);--accent:#3b82f6;--accent-bright:#60a5fa;--accent-deep:#2563eb;--accent-glow:rgba(59,130,246,0.35);--fd-nav-height:72px}.dark,:root{--color-fd-background:#0a0a0f;--color-fd-foreground:#f4f5f8;--color-fd-muted:#14151e;--color-fd-muted-foreground:#8a8d99;--color-fd-popover:#1a1c27;--color-fd-popover-foreground:#f4f5f8;--color-fd-card:#0f1017;--color-fd-card-foreground:#f4f5f8;--color-fd-border:rgba(255,255,255,0.08);--color-fd-primary:#3b82f6;--color-fd-primary-foreground:#ffffff;--color-fd-secondary:#14151e;--color-fd-secondary-foreground:#f4f5f8;--color-fd-accent:rgba(59,130,246,0.12);--color-fd-accent-foreground:#f4f5f8;--color-fd-ring:#3b82f6}#nd-sidebar,.dark #nd-sidebar{--color-fd-muted:#0d0e15;--color-fd-secondary:#14151e;--color-fd-muted-foreground:#c2c5cf}.nav{position:fixed;top:0;left:0;right:0;z-index:100;justify-content:center;padding:var(--s-4) 0;font-family:var(--font-ui);background:var(--glass);backdrop-filter:blur(18px) saturate(180%);-webkit-backdrop-filter:blur(18px) saturate(180%);border-bottom:1px solid var(--line-1)}.nav,.nav-inner{display:flex;align-items:center}.nav-inner{width:100%;max-width:1200px;padding:0 var(--s-6);justify-content:space-between;gap:var(--s-6)}.nav-brand{display:inline-flex;align-items:center;gap:var(--s-3);font-weight:600;letter-spacing:-.02em;font-size:16px;color:var(--fg-0);text-decoration:none}.nav-brand img{width:22px;height:22px;filter:drop-shadow(0 0 8px var(--accent-glow))}.nav-links{display:flex;align-items:center;gap:2px}.nav-link{padding:8px 12px;color:var(--fg-1);font-size:14px;border-radius:var(--r-sm);white-space:nowrap;text-decoration:none;transition:color .16s var(--ease),background .16s var(--ease)}.nav-link.active,.nav-link:hover{color:var(--fg-0);background:var(--bg-2)}.nav-cta{display:flex;gap:var(--s-3)}.btn,.nav-cta{align-items:center}.btn{display:inline-flex;justify-content:center;gap:var(--s-2);height:40px;padding:0 var(--s-5);border-radius:var(--r-pill);font-family:var(--font-ui);font-size:14px;font-weight:500;letter-spacing:-.005em;cursor:pointer;border:1px solid transparent;background:transparent;color:var(--fg-0);text-decoration:none;transition:background .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .12s var(--ease);user-select:none;white-space:nowrap}.btn:active{transform:translateY(1px)}.btn--primary{background:var(--accent);color:#fff;box-shadow:0 0 0 1px var(--accent-deep) inset,0 8px 24px -8px var(--accent-glow)}.btn--primary:hover{background:var(--accent-bright)}.btn--ghost{color:var(--fg-1)}.btn--ghost:hover{background:var(--bg-2);color:var(--fg-0)}.btn--sm{height:32px;padding:0 14px;font-size:13px}