:root{--primary:#3b82f6;--primary-hover:#60a5fa;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--info:#3b82f6;--bg:#0f172a;--surface:#1e293b;--border:#334155;--text:#f8fafc;--muted:#94a3b8;--disabled-bg:#334155;--disabled-text:#64748b;--radius:12px;--radius-lg:16px;--radius-xl:20px;--shadow-sm:0 1px 2px 0 #00000080;--shadow:0 1px 3px 0 #00000080, 0 1px 2px -1px #00000080;--shadow-md:0 4px 6px -1px #00000080, 0 2px 4px -2px #00000080;--shadow-lg:0 10px 15px -3px #00000080, 0 4px 6px -4px #00000080}*{box-sizing:border-box}html,body{background-color:var(--bg);color:var(--text);margin:0;padding:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}.card-surface{background-color:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:24px}.btn{border-radius:var(--radius);cursor:pointer;border:1px solid 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