:root{--bg-primary:#0a0a0f;--bg-secondary:#12121a;--bg-glass:#12121a99;--bg-glass-hover:#1c1c28e6;--accent-primary:#3b82f6;--accent-secondary:#8b5cf6;--accent-gradient:linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);--accent-glow:#3b82f64d;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--border-glass:#ffffff14;--border-focus:#3b82f680;--border-hover:#ffffff26;--radius-sm:8px;--radius-md:12px;--radius-lg:20px;--radius-full:9999px;--transition-fast:.2s ease;--transition-normal:.3s ease;--transition-slow:.5s ease}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-image:radial-gradient(circle at 15% 30%,#3b82f614 0%,#0000 40%),radial-gradient(circle at 85% 70%,#8b5cf614 0%,#0000 40%),radial-gradient(circle at 50% 0,#ffffff08 0%,#0000 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(prefers-reduced-motion:reduce){.mobile-nav-panel,.mobile-nav-panel>*,.mobile-nav-backdrop{animation:none}}.back-to-top{background:var(--bg-glass);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-glass);width:48px;height:48px;color:var(--text-primary);cursor:pointer;opacity:0;pointer-events:none;transition:opacity .25s ease, transform .25s ease, border-color var(--transition-normal), box-shadow var(--transition-normal), background .2s ease;z-index:80;border-radius:50%;justify-content:center;align-items:center;display:flex;position:fixed;bottom:24px;right:24px;transform:translateY(8px);box-shadow:0 8px 24px #00000059}.back-to-top.visible{opacity:1;pointer-events:auto;transform:translateY(0)}.back-to-top:hover{background:var(--bg-glass-hover);border-color:var(--accent-glow);box-shadow:0 0 20px var(--accent-glow), 0 8px 24px #00000059;transform:translateY(-2px)}@media (width<=768px){.back-to-top{width:44px;height:44px;bottom:16px;right:16px}}@media (prefers-reduced-motion:reduce){.back-to-top{transition:opacity .15s linear;transform:none}.back-to-top.visible,.back-to-top:hover{transform:none}}