:root{--bg:#f4f7fb;--dark:#0f172a;--blue:#2563eb;--yellow:#facc15;--text:#1f2937;--muted:#64748b;--card:#fff;--border:#e5e7eb;--radius:22px;--shadow:0 20px 45px rgba(15,23,42,.10)}*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{text-decoration:none;color:inherit}.topbar{background:#020617;color:#cbd5e1;font-size:14px;padding:8px 18px;text-align:center}header{background:rgba(255,255,255,.94);backdrop-filter:blur(12px);position:sticky;top:0;z-index:100;border-bottom:1px solid var(--border)}.nav{max-width:1200px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:16px 20px;gap:20px}.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:25px;letter-spacing:-1px;color:var(--dark)}.logo span{background:var(--dark);color:var(--yellow);width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-size:18px}nav 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form{flex-direction:column}.newsletter button{padding:14px}.article{padding:26px;margin:22px 12px}}