* { box-sizing: border-box; font-family: 'Inter', sans-serif; }
        body { margin: 0; background-color: #0b1121; color: #f8fafc; display: flex; align-items: center; justify-content: center; height: 100vh; }
        
        .auth-container { background: #151e32; padding: 40px; border-radius: 16px; border: 1px solid #1e293b; width: 100%; max-width: 400px; box-shadow: 0 20px 50px rgba(0,0,0,0.5); }
        .logo { font-size: 24px; font-weight: 800; text-align: center; margin-bottom: 30px; letter-spacing: -1px; }
        .logo span { color: #2472fc; }
        
        .tabs { display: flex; margin-bottom: 20px; border-bottom: 1px solid #1e293b; }
        .tab { flex: 1; text-align: center; padding: 10px; cursor: pointer; color: #94a3b8; font-weight: bold; }
        .tab.active { color: #2472fc; border-bottom: 2px solid #2472fc; }
        
        input { width: 100%; padding: 12px; margin-bottom: 15px; background: #0b1121; border: 1px solid #1e293b; color: #fff; border-radius: 6px; font-size: 14px; }
        input:focus { outline: none; border-color: #2472fc; }
        
        button { width: 100%; padding: 12px; background: #2472fc; color: white; border: none; border-radius: 6px; font-size: 16px; font-weight: bold; cursor: pointer; transition: background 0.2s; }
        button:hover { background: #1d5bca; }
        
        #errorMsg { color: #ef4444; font-size: 13px; text-align: center; margin-bottom: 15px; display: none; }
        #successMsg { color: #22c55e; font-size: 13px; text-align: center; margin-bottom: 15px; display: none; }

        /* Mobile Responsiveness */
        @media (max-width: 480px) {
            body { padding: 20px; align-items: flex-start; margin-top: 40px; }
            .auth-container { padding: 30px 20px; }
            .logo { font-size: 20px; }
            button { font-size: 15px; padding: 14px; }
            input { padding: 14px; }
        }