:root{--primary:#667eea;--secondary:#764ba2;--bg:#fff;--bg2:#f8f9fa;--tx:#333;--tx2:#666;--card:#fff;--border:#e0e0e0;--shadow:rgba(0,0,0,.1)}[data-theme=dark]{--bg:#1a1a1a;--bg2:#2d2d2d;--tx:#fff;--tx2:#ccc;--card:#2d2d2d;--border:#404040;--shadow:rgba(0,0,0,.5)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:var(--bg);color:var(--tx);min-height:100vh;transition:background .3s,color .3s}.top-header{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;padding:20px 40px;box-shadow:0 4px 6px var(--shadow);position:sticky;top:0;z-index:1000}.hdr-inner{max-width:1400px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}.logo-sec{display:flex;align-items:center;gap:14px}.logo{width:48px;height:48px;background:#fff;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:22px;box-shadow:0 4px 8px rgba(0,0,0,.2)}.site-title 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