:root{--width:1000px;--font-main:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;--font-mono:"SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;--bg:#ffffff;--bg-secondary:#f8f9fa;--bg-tertiary:#f1f3f5;--bg-dark:#1a1a2e;--bg-dark-secondary:#16213e;--text:#1a1a2e;--text-secondary:#4a5568;--text-muted:#718096;--heading:#0f0f23;--link:#1a5f2a;--link-hover:#134a20;--accent:#1a5f2a;--accent-light:#e8f5e9;--accent-dark:#0d3d16;--border:#e2e8f0;--border-strong:#cbd5e0;--shadow-sm:0 1px 2px rgba(0,0,0,0.04);--shadow:0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);--shadow-xl:0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.02);--radius-sm:6px;--radius:10px;--radius-lg:16px;--transition:0.2s cubic-bezier(0.4, 0, 0.2, 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p{max-width:280px}.footer-social{display:flex;gap:12px;margin-top:16px}.social-link{width:36px;height:36px;border-radius:var(--radius-sm);background:rgba(255,255,255,8%);display:flex;align-items:center;justify-content:center;color:var(--text-muted);transition:all var(--transition)}.social-link:hover{background:var(--accent);color:#fff;text-decoration:none}.footer-bottom{max-width:var(--width);margin:0 auto;padding:20px 24px;border-top:1px solid rgba(255,255,255,8%);text-align:center}.footer-bottom p{font-size:.8rem;color:var(--text-muted);margin:0}.back-to-top{position:fixed;bottom:24px;right:24px;width:44px;height:44px;border-radius:50%;background:var(--accent);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transform:translateY(10px);transition:all 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